Merging gst-docs

.gitignore

@@ -0,0 +1,32 @@
+/built_doc
+.vscode
+build/
+/hotdoc-private*
+/.hotdoc.d
+/*.stamp
+Debug
+Release
+ipch
+*.user
+*.sdf
+*.suo
+*.opensdf
+vs/2010/libs
+bin
+gen
+libs
+obj
+.classpath
+.project
+.settings
+.libs
+.cproject
+gst-build
+project.properties
+gst_sdk
+.DS_Store
+xcuserdata
+/plugins-introspection/cache/
+/hotdoc_env/
+*.html
+*~

.gitlab-ci.yml

@@ -0,0 +1 @@
+include: 'https://gitlab.freedesktop.org/gstreamer/gst-ci/raw/master/gitlab/ci_template.yml'

LICENSE.BSD

@@ -0,0 +1,25 @@
+Copyright (C) GStreamer developers
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LICENSE.CC-BY-SA-4.0

@@ -0,0 +1,348 @@
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LICENSE.LGPL-2.1

@@ -0,0 +1,502 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
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+
+                     END OF TERMS AND CONDITIONS
+
+           How to Apply These Terms to Your New Libraries
+
+  If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change.  You can do so by permitting
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+ordinary General Public License).
+
+  To apply these terms, attach the following notices to the library.  It is
+safest to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the library's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the
+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!

LICENSE.MIT

@@ -0,0 +1,19 @@
+Copyright (C) GStreamer developers
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

LICENSE.OPL

@@ -0,0 +1,137 @@
+Open Publication License
+v1.0, 8 June 1999
+
+
+I. REQUIREMENTS ON BOTH UNMODIFIED AND MODIFIED VERSIONS
+
+The Open Publication works may be reproduced and distributed in whole or in
+part, in any medium physical or electronic, provided that the terms of this
+license are adhered to, and that this license or an incorporation of it by
+reference (with any options elected by the author(s) and/or publisher) is
+displayed in the reproduction.
+
+Proper form for an incorporation by reference is as follows:
+
+    Copyright (c) <year> by <author's name or designee>. This material
+    may be distributed only subject to the terms and conditions set
+    forth in the Open Publication License, vX.Y or later (the latest
+    version is presently available at http://www.opencontent.org/openpub/).
+
+The reference must be immediately followed with any options elected by the
+author(s) and/or publisher of the document (see section VI).
+
+Commercial redistribution of Open Publication-licensed material is permitted.
+
+Any publication in standard (paper) book form shall require the citation of
+the original publisher and author. The publisher and author's names shall
+appear on all outer surfaces of the book. On all outer surfaces of the book
+the original publisher's name shall be as large as the title of the work
+and cited as possessive with respect to the title.
+
+
+II. COPYRIGHT
+
+The copyright to each Open Publication is owned by its author(s) or designee.
+
+
+III. SCOPE OF LICENSE
+
+The following license terms apply to all Open Publication works, unless
+otherwise explicitly stated in the document.
+
+Mere aggregation of Open Publication works or a portion of an Open Publication
+work with other works or programs on the same media shall not cause this
+license to apply to those other works. The aggregate work shall contain a
+notice specifying the inclusion of the Open Publication material and
+appropriate copyright notice.
+
+SEVERABILITY. If any part of this license is found to be unenforceable in any
+jurisdiction, the remaining portions of the license remain in force.
+
+NO WARRANTY. Open Publication works are licensed and provided "as is" without
+warranty of any kind, express or implied, including, but not limited to, the
+implied warranties of merchantability and fitness for a particular purpose or
+a warranty of non-infringement.
+
+
+IV. REQUIREMENTS ON MODIFIED WORKS
+
+All modified versions of documents covered by this license, including
+translations, anthologies, compilations and partial documents, must meet
+the following requirements:
+
+    1. The modified version must be labeled as such.
+
+    2. The person making the modifications must be identified and the
+       modifications dated.
+
+    3. Acknowledgement of the original author and publisher if applicable
+       must be retained according to normal academic citation practices.
+
+    4. The location of the original unmodified document must be identified.
+
+    5. The original author's (or authors') name(s) may not be used to assert
+       or imply endorsement of the resulting document without the original
+       author's (or authors') permission.
+
+
+V. GOOD-PRACTICE RECOMMENDATIONS
+
+In addition to the requirements of this license, it is requested from and
+strongly recommended of redistributors that:
+
+    1. If you are distributing Open Publication works on hardcopy or CD-ROM,
+       you provide email notification to the authors of your intent to
+       redistribute at least thirty days before your manuscript or media freeze,
+       to give the authors time to provide updated documents. This notification
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+
+    2. All substantive modifications (including deletions) be either clearly
+       marked up in the document or else described in an attachment to the
+       document.
+
+    3. Finally, while it is not mandatory under this license, it is considered
+       good form to offer a free copy of any hardcopy and CD-ROM expression of
+       an Open Publication-licensed work to its author(s).
+
+
+VI. LICENSE OPTIONS
+
+The author(s) and/or publisher of an Open Publication-licensed document may
+elect certain options by appending language to the reference to or copy of the
+license. These options are considered part of the license instance and must be
+included with the license (or its incorporation by reference) in derived works.
+
+A. To prohibit distribution of substantively modified versions without the
+explicit permission of the author(s). "Substantive modification" is defined
+as a change to the semantic content of the document, and excludes mere changes
+in format or typographical corrections.
+
+To accomplish this, add the phrase `Distribution of substantively modified
+versions of this document is prohibited without the explicit permission of
+the copyright holder.' to the license reference or copy.
+
+B. To prohibit any publication of this work or derivative works in whole or
+in part in standard (paper) book form for commercial purposes is prohibited
+unless prior permission is obtained from the copyright holder.
+
+To accomplish this, add the phrase 'Distribution of the work or derivative of
+the work in any standard (paper) book form is prohibited unless prior
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+or copy.
+
+
+OPEN PUBLICATION POLICY APPENDIX:
+
+(This is not considered part of the license.)
+
+Open Publication works are available in source format via the Open Publication
+home page at http://works.opencontent.org/.
+
+Open Publication authors who want to include their own license on Open
+Publication works may do so, as long as their terms are not more restrictive
+than the Open Publication license.
+
+If you have questions about the Open Publication License, please contact
+David Wiley, and/or the Open Publication Authors' List at opal@opencontent.org,
+via email.

README.md

@@ -0,0 +1,145 @@
+# Introduction
+
+This is a collection of design documents, formerly maintained in various
+different locations and formats, now grouped together and converted
+to commonmark.
+
+# Contributing
+
+## Style
+
+We will follow the commonmark specification.
+
+We *should* try to follow this
+[style guide](http://www.cirosantilli.com/markdown-style-guide/#about),
+but are still [evaluating solutions](https://github.com/jgm/cmark/issues/131)
+for *stable* automatic formatting.
+
+80 columns line width is thus not yet enforced, but strongly suggested.
+
+# Build the documentation
+
+## Install dependencies
+
+* Follow [hotdoc's installation guide](https://hotdoc.github.io/installing.html),
+  preferably in a virtualenv.
+
+* We *experimentally* use the hotdoc C extension to include functions by
+  name, follow the steps outlined [here](https://github.com/hotdoc/hotdoc_c_extension)
+
+## Build the portal without the API documentation
+
+```
+meson build
+ninja -C build/ GStreamer-doc
+```
+
+And browse it:
+
+```
+gio open build/GStreamer-doc/html/index.html
+```
+
+## API documentation
+
+Building the API documentation in the portal implies using
+[gst-build](https://gitlab.freedesktop.org/gstreamer/gst-build/) which allows us
+to aggregate the documentation from all GStreamer modules using the hotdoc subproject
+feature.
+
+From `gst-build`:
+
+```
+meson build/
+ninja -C build subprojects/gst-docs/GStreamer-doc
+```
+
+And browse the doc:
+
+```
+gio open build/subprojects/gst-docs/GStreamer-doc/html/index.html
+```
+
+You can also generate a release tarball of the portal with:
+
+```
+ninja -C build gst-docs@@release
+```
+
+### Adding a newly written plugin to the documentation
+
+To add a plugin to the documentation you need to add the given
+meson target to the `plugins` list present in each GStreamer module for
+example:
+
+``` meson
+gst_elements = library('gstcoreelements',
+  gst_elements_sources,
+  c_args : gst_c_args,
+  include_directories : [configinc],
+  dependencies : [gobject_dep, glib_dep, gst_dep, gst_base_dep],
+  install : true,
+  install_dir : plugins_install_dir,
+)
+plugins += [gst_elements]
+```
+
+Then you need to regenerate the `gst_plugins_cache.json` file by running
+the target manually, if building from the module itself:
+
+```
+ninja -C <build-dir> docs/gst_plugins_cache.json
+```
+
+if you use `gst-build` you can run the target that will rebuild all cache files:
+
+```
+ninja -C <build-dir> plugins_doc_caches`
+```
+
+NOTE: the newly generated cache should be commited to the git repos.
+
+The plugins documentation is generated based on that file to
+avoid needing to have built all plugins to get the documentation generated.
+
+NOTE: When moving plugins from one module to another, the `gst_plugins_cache.json`
+from the module where the plugin has been removed should be manually edited
+to reflect the removal.
+
+## Licensing
+
+The content of this module comes from a number of different sources and is
+licensed in different ways:
+
+### Tutorial source code
+
+All tutorial code is licensed under any of the following licenses (your choice):
+
+ - 2-clause BSD license ("simplified BSD license") (`LICENSE.BSD`)
+ - MIT license (`LICENSE.MIT`)
+ - LGPL v2.1 (`LICENSE.LGPL-2.1`), or (at your option) any later version
+
+This means developers have maximum flexibility and can pick the right license
+for any derivative work.
+
+### Application Developer Manual and Plugin Writer's Guide
+
+These are licensed under the [Open Publication License v1.0][op-license]
+(`LICENSE.OPL`), for historical reasons.
+
+[op-license]: http://www.opencontent.org/openpub/
+
+### Documentation
+
+#### Tutorials
+
+The tutorials are licensed under the [Creative Commons CC-BY-SA-4.0 license][cc-by-sa-4.0]
+(`LICENSE.CC-BY-SA-4.0`).
+
+[cc-by-sa-4.0]: https://creativecommons.org/licenses/by-sa/4.0/
+
+#### API Reference and Design Documentation
+
+The remaining documentation, including the API reference and Design Documentation,
+is licensed under the LGPL v2.1 (`LICENSE.LGPL-2.1`), or (at your option) any later
+version.

TODO.md

@@ -0,0 +1,41 @@
+# Todo
+
+For-later pages:
+ - tutorials/qt-tutorials.md [tpm: this should all be rewritten from scratch with qmlglsink; QtGStreamer is outdated and unmaintained, we should not promote it]
+   - basic-media-player.md
+   - qt-gstreamer-vs-c-gstreamer.md
+   - using-appsink-appsrc-in-qt.md
+
+Miscellaneous:
+ - faq/git.md should be renamed building.md and turned into general
+   building Q+A or (better) point to a page we have for all that by then
+ - faq/legal.md needs an overhaul, and be made more relevant
+ - licensing.md and legal-information.md need to be reviewed + merged,
+   possibly with FAQ section.
+
+old sitemap:
+
+        Installing the SDK
+            Installing on Linux
+            Installing on Mac OS X
+            Installing on Windows
+            Installing for Android development
+            Installing for iOS development
+            Building from source using Cerbero
+        Tutorials
+            Basic tutorials
+            Playback tutorials
+            Android tutorials
+            iOS tutorials
+            Table of Concepts
+            Upcoming tutorials
+        Deploying your application
+            Mac OS X deployment
+            Windows deployment
+            Multiplatform deployment using Cerbero
+        GStreamer reference
+            gst-inspect
+            gst-launch
+        Legal information
+        Frequently Asked Questions
+        Contact

examples/bus_example.c

@@ -0,0 +1,79 @@
+#include <gst/gst.h>
+
+static GMainLoop *loop;
+
+static gboolean
+my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
+{
+  g_print ("Got %s message\n", GST_MESSAGE_TYPE_NAME (message));
+
+  switch (GST_MESSAGE_TYPE (message)) {
+    case GST_MESSAGE_ERROR:{
+      GError *err;
+      gchar *debug;
+
+      gst_message_parse_error (message, &err, &debug);
+      g_print ("Error: %s\n", err->message);
+      g_error_free (err);
+      g_free (debug);
+
+      g_main_loop_quit (loop);
+      break;
+    }
+    case GST_MESSAGE_EOS:
+      /* end-of-stream */
+      g_main_loop_quit (loop);
+      break;
+    default:
+      /* unhandled message */
+      break;
+  }
+
+  /* we want to be notified again the next time there is a message
+   * on the bus, so returning TRUE (FALSE means we want to stop watching
+   * for messages on the bus and our callback should not be called again)
+   */
+  return TRUE;
+}
+
+gint
+main (gint argc, gchar * argv[])
+{
+  GstElement *pipeline;
+  GstBus *bus;
+  guint bus_watch_id;
+
+  /* init */
+  gst_init (&argc, &argv);
+
+  /* create pipeline, add handler */
+  pipeline = gst_pipeline_new ("my_pipeline");
+
+  /* adds a watch for new message on our pipeline's message bus to
+   * the default GLib main context, which is the main context that our
+   * GLib main loop is attached to below
+   */
+  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
+  bus_watch_id = gst_bus_add_watch (bus, my_bus_callback, NULL);
+  gst_object_unref (bus);
+
+  /* [...] */
+
+  /* create a mainloop that runs/iterates the default GLib main context
+   * (context NULL), in other words: makes the context check if anything
+   * it watches for has happened. When a message has been posted on the
+   * bus, the default main context will automatically call our
+   * my_bus_callback() function to notify us of that message.
+   * The main loop will be run until someone calls g_main_loop_quit()
+   */
+  loop = g_main_loop_new (NULL, FALSE);
+  g_main_loop_run (loop);
+
+  /* clean up */
+  gst_element_set_state (pipeline, GST_STATE_NULL);
+  gst_object_unref (pipeline);
+  g_source_remove (bus_watch_id);
+  g_main_loop_unref (loop);
+
+  return 0;
+}

examples/snippets.c

@@ -0,0 +1,37 @@
+#include <gst/gst.h>
+
+static void
+link_to_multiplexer (GstPad * tolink_pad, GstElement * mux)
+{
+  GstPad *pad;
+  gchar *srcname, *sinkname;
+
+  srcname = gst_pad_get_name (tolink_pad);
+  pad = gst_element_get_compatible_pad (mux, tolink_pad, NULL);
+  gst_pad_link (tolink_pad, pad);
+  sinkname = gst_pad_get_name (pad);
+  gst_object_unref (GST_OBJECT (pad));
+
+  g_print ("A new pad %s was created and linked to %s\n", sinkname, srcname);
+  g_free (sinkname);
+  g_free (srcname);
+}
+
+static void
+some_function (GstElement * tee)
+{
+  GstPad *pad;
+  gchar *name;
+
+  pad = gst_element_request_pad_simple (tee, "src%d");
+  name = gst_pad_get_name (pad);
+  g_print ("A new pad %s was created\n", name);
+  g_free (name);
+
+  /* here, you would link the pad */
+
+  /* [..] */
+
+  /* and, after doing that, free our reference */
+  gst_object_unref (GST_OBJECT (pad));
+}

examples/tutorials/android/.gitignore

@@ -0,0 +1,2 @@
+.gradle
+build/

examples/tutorials/android/android-tutorial-1/.gitignore

@@ -0,0 +1,4 @@
+.externalNativeBuild/
+assets/
+gst-build-*/
+src/org/freedesktop/gstreamer/GStreamer.java

examples/tutorials/android/android-tutorial-1/AndroidManifest.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.freedesktop.gstreamer.tutorials.tutorial_1"
+      android:versionCode="1"
+      android:versionName="1.0">
+    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="14"/>
+    <application android:label="@string/app_name"
+                 android:icon="@drawable/gstreamer_logo_1">
+        <activity android:name=".Tutorial1"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

examples/tutorials/android/android-tutorial-1/build.gradle

@@ -0,0 +1,73 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion '27.0.3'
+
+    defaultConfig {
+        applicationId "org.freedesktop.gstreamer.tutorials.tutorial_1"
+        minSdkVersion 15
+        targetSdkVersion 15
+        versionCode 1
+        versionName "1.0"
+
+
+        externalNativeBuild {
+            ndkBuild {
+                def gstRoot
+
+                if (project.hasProperty('gstAndroidRoot'))
+                    gstRoot = project.gstAndroidRoot
+                else
+                    gstRoot = System.env.GSTREAMER_ROOT_ANDROID
+
+                if (gstRoot == null)
+                    throw new GradleException('GSTREAMER_ROOT_ANDROID must be set, or "gstAndroidRoot" must be defined in your gradle.properties in the top level directory of the unpacked universal GStreamer Android binaries')
+
+                arguments "NDK_APPLICATION_MK=jni/Application.mk", "GSTREAMER_JAVA_SRC_DIR=src", "GSTREAMER_ROOT_ANDROID=$gstRoot", "GSTREAMER_ASSETS_DIR=src/assets"
+
+                targets "tutorial-1"
+
+                // All archs except MIPS and MIPS64 are supported
+                abiFilters  'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            sourceSets {
+                main {
+                    manifest.srcFile 'AndroidManifest.xml'
+                    java.srcDirs = ['src']
+                    resources.srcDirs = ['src']
+                    aidl.srcDirs = ['src']
+                    renderscript.srcDirs = ['src']
+                    res.srcDirs = ['res']
+                    assets.srcDirs = ['assets']
+                }
+            }
+        }
+    }
+
+    externalNativeBuild {
+        ndkBuild {
+            path 'jni/Android.mk'
+        }
+    }
+}
+
+afterEvaluate {
+    if (project.hasProperty('compileDebugJavaWithJavac'))
+        project.compileDebugJavaWithJavac.dependsOn 'externalNativeBuildDebug'
+    if (project.hasProperty('compileReleaseJavaWithJavac'))
+        project.compileReleaseJavaWithJavac.dependsOn 'externalNativeBuildRelease'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support:appcompat-v7:23.1.1'
+}

examples/tutorials/android/android-tutorial-1/jni/Android.mk

@@ -0,0 +1,32 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := tutorial-1
+LOCAL_SRC_FILES := tutorial-1.c dummy.cpp
+LOCAL_SHARED_LIBRARIES := gstreamer_android
+LOCAL_LDLIBS := -llog
+include $(BUILD_SHARED_LIBRARY)
+
+ifndef GSTREAMER_ROOT_ANDROID
+$(error GSTREAMER_ROOT_ANDROID is not defined!)
+endif
+
+ifeq ($(TARGET_ARCH_ABI),armeabi)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm
+else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
+else ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm64
+else ifeq ($(TARGET_ARCH_ABI),x86)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86
+else ifeq ($(TARGET_ARCH_ABI),x86_64)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86_64
+else
+$(error Target arch ABI not supported: $(TARGET_ARCH_ABI))
+endif
+
+GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build/
+GSTREAMER_PLUGINS         := coreelements
+GSTREAMER_EXTRA_LIBS      := -liconv
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

examples/tutorials/android/android-tutorial-1/jni/Application.mk

@@ -0,0 +1,2 @@
+APP_ABI = armeabi armeabi-v7a arm64-v8a x86 x86_64
+APP_STL = c++_shared

examples/tutorials/android/android-tutorial-1/jni/tutorial-1.c

@@ -0,0 +1,39 @@
+#include <string.h>
+#include <jni.h>
+#include <android/log.h>
+#include <gst/gst.h>
+
+/*
+ * Java Bindings
+ */
+static jstring
+gst_native_get_gstreamer_info (JNIEnv * env, jobject thiz)
+{
+  char *version_utf8 = gst_version_string ();
+  jstring *version_jstring = (*env)->NewStringUTF (env, version_utf8);
+  g_free (version_utf8);
+  return version_jstring;
+}
+
+static JNINativeMethod native_methods[] = {
+  {"nativeGetGStreamerInfo", "()Ljava/lang/String;",
+      (void *) gst_native_get_gstreamer_info}
+};
+
+jint
+JNI_OnLoad (JavaVM * vm, void *reserved)
+{
+  JNIEnv *env = NULL;
+
+  if ((*vm)->GetEnv (vm, (void **) &env, JNI_VERSION_1_4) != JNI_OK) {
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-1",
+        "Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env,
+      "org/freedesktop/gstreamer/tutorials/tutorial_1/Tutorial1");
+  (*env)->RegisterNatives (env, klass, native_methods,
+      G_N_ELEMENTS (native_methods));
+
+  return JNI_VERSION_1_4;
+}

examples/tutorials/android/android-tutorial-1/res/layout/main.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/textview_info"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center_vertical|center_horizontal"
+        android:textAppearance="?android:attr/textAppearanceLarge" />
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-1/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">GStreamer tutorial 1</string>
+</resources>

examples/tutorials/android/android-tutorial-1/src/org/freedesktop/gstreamer/tutorials/tutorial_1/Tutorial1.java

@@ -0,0 +1,38 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_1;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.freedesktop.gstreamer.GStreamer;
+
+public class Tutorial1 extends Activity {
+    private native String nativeGetGStreamerInfo();
+
+    // Called when the activity is first created.
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        try {
+            GStreamer.init(this);
+        } catch (Exception e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
+            return;
+        }
+
+        setContentView(R.layout.main);
+
+        TextView tv = (TextView)findViewById(R.id.textview_info);
+        tv.setText("Welcome to " + nativeGetGStreamerInfo() + " !");
+    }
+
+    static {
+        System.loadLibrary("gstreamer_android");
+        System.loadLibrary("tutorial-1");
+    }
+
+}

examples/tutorials/android/android-tutorial-2/.gitignore

@@ -0,0 +1,4 @@
+.externalNativeBuild/
+assets/
+gst-build-*/
+src/org/freedesktop/gstreamer/GStreamer.java

examples/tutorials/android/android-tutorial-2/AndroidManifest.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.freedesktop.gstreamer.tutorials.tutorial_2"
+      android:versionCode="1"
+      android:versionName="1.0">
+    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="14"/>
+    <application android:label="@string/app_name"
+                 android:icon="@drawable/gstreamer_logo_2">
+        <activity android:name=".Tutorial2"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

examples/tutorials/android/android-tutorial-2/build.gradle

@@ -0,0 +1,73 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion '27.0.3'
+
+    defaultConfig {
+        applicationId "org.freedesktop.gstreamer.tutorials.tutorial_2"
+        minSdkVersion 15
+        targetSdkVersion 15
+        versionCode 1
+        versionName "1.0"
+
+
+        externalNativeBuild {
+            ndkBuild {
+                def gstRoot
+
+                if (project.hasProperty('gstAndroidRoot'))
+                    gstRoot = project.gstAndroidRoot
+                else
+                    gstRoot = System.env.GSTREAMER_ROOT_ANDROID
+
+                if (gstRoot == null)
+                    throw new GradleException('GSTREAMER_ROOT_ANDROID must be set, or "gstAndroidRoot" must be defined in your gradle.properties in the top level directory of the unpacked universal GStreamer Android binaries')
+
+                arguments "NDK_APPLICATION_MK=jni/Application.mk", "GSTREAMER_JAVA_SRC_DIR=src", "GSTREAMER_ROOT_ANDROID=$gstRoot", "GSTREAMER_ASSETS_DIR=src/assets"
+
+                targets "tutorial-2"
+
+                // All archs except MIPS and MIPS64 are supported
+                abiFilters  'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            sourceSets {
+                main {
+                    manifest.srcFile 'AndroidManifest.xml'
+                    java.srcDirs = ['src']
+                    resources.srcDirs = ['src']
+                    aidl.srcDirs = ['src']
+                    renderscript.srcDirs = ['src']
+                    res.srcDirs = ['res']
+                    assets.srcDirs = ['assets']
+                }
+            }
+        }
+    }
+
+    externalNativeBuild {
+        ndkBuild {
+            path 'jni/Android.mk'
+        }
+    }
+}
+
+afterEvaluate {
+    if (project.hasProperty('compileDebugJavaWithJavac'))
+        project.compileDebugJavaWithJavac.dependsOn 'externalNativeBuildDebug'
+    if (project.hasProperty('compileReleaseJavaWithJavac'))
+        project.compileReleaseJavaWithJavac.dependsOn 'externalNativeBuildRelease'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support:appcompat-v7:23.1.1'
+}

examples/tutorials/android/android-tutorial-2/jni/Android.mk

@@ -0,0 +1,33 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := tutorial-2
+LOCAL_SRC_FILES := tutorial-2.c dummy.cpp
+LOCAL_SHARED_LIBRARIES := gstreamer_android
+LOCAL_LDLIBS := -llog
+include $(BUILD_SHARED_LIBRARY)
+
+ifndef GSTREAMER_ROOT_ANDROID
+$(error GSTREAMER_ROOT_ANDROID is not defined!)
+endif
+
+ifeq ($(TARGET_ARCH_ABI),armeabi)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm
+else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
+else ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm64
+else ifeq ($(TARGET_ARCH_ABI),x86)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86
+else ifeq ($(TARGET_ARCH_ABI),x86_64)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86_64
+else
+$(error Target arch ABI not supported: $(TARGET_ARCH_ABI))
+endif
+
+GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build/
+include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
+GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_SYS)
+GSTREAMER_EXTRA_LIBS      := -liconv
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

examples/tutorials/android/android-tutorial-2/jni/Application.mk

@@ -0,0 +1,2 @@
+APP_ABI = armeabi armeabi-v7a arm64-v8a x86 x86_64
+APP_STL = c++_shared

examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c

@@ -0,0 +1,326 @@
+#include <string.h>
+#include <jni.h>
+#include <android/log.h>
+#include <gst/gst.h>
+#include <pthread.h>
+
+GST_DEBUG_CATEGORY_STATIC (debug_category);
+#define GST_CAT_DEFAULT debug_category
+
+/*
+ * These macros provide a way to store the native pointer to CustomData, which might be 32 or 64 bits, into
+ * a jlong, which is always 64 bits, without warnings.
+ */
+#if GLIB_SIZEOF_VOID_P == 8
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)data)
+#else
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(jint)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)(jint)data)
+#endif
+
+/* Structure to contain all our information, so we can pass it to callbacks */
+typedef struct _CustomData
+{
+  jobject app;                  /* Application instance, used to call its methods. A global reference is kept. */
+  GstElement *pipeline;         /* The running pipeline */
+  GMainContext *context;        /* GLib context used to run the main loop */
+  GMainLoop *main_loop;         /* GLib main loop */
+  gboolean initialized;         /* To avoid informing the UI multiple times about the initialization */
+} CustomData;
+
+/* These global variables cache values which are not changing during execution */
+static pthread_t gst_app_thread;
+static pthread_key_t current_jni_env;
+static JavaVM *java_vm;
+static jfieldID custom_data_field_id;
+static jmethodID set_message_method_id;
+static jmethodID on_gstreamer_initialized_method_id;
+
+/*
+ * Private methods
+ */
+
+/* Register this thread with the VM */
+static JNIEnv *
+attach_current_thread (void)
+{
+  JNIEnv *env;
+  JavaVMAttachArgs args;
+
+  GST_DEBUG ("Attaching thread %p", g_thread_self ());
+  args.version = JNI_VERSION_1_4;
+  args.name = NULL;
+  args.group = NULL;
+
+  if ((*java_vm)->AttachCurrentThread (java_vm, &env, &args) < 0) {
+    GST_ERROR ("Failed to attach current thread");
+    return NULL;
+  }
+
+  return env;
+}
+
+/* Unregister this thread from the VM */
+static void
+detach_current_thread (void *env)
+{
+  GST_DEBUG ("Detaching thread %p", g_thread_self ());
+  (*java_vm)->DetachCurrentThread (java_vm);
+}
+
+/* Retrieve the JNI environment for this thread */
+static JNIEnv *
+get_jni_env (void)
+{
+  JNIEnv *env;
+
+  if ((env = pthread_getspecific (current_jni_env)) == NULL) {
+    env = attach_current_thread ();
+    pthread_setspecific (current_jni_env, env);
+  }
+
+  return env;
+}
+
+/* Change the content of the UI's TextView */
+static void
+set_ui_message (const gchar * message, CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  GST_DEBUG ("Setting message to: %s", message);
+  jstring jmessage = (*env)->NewStringUTF (env, message);
+  (*env)->CallVoidMethod (env, data->app, set_message_method_id, jmessage);
+  if ((*env)->ExceptionCheck (env)) {
+    GST_ERROR ("Failed to call Java method");
+    (*env)->ExceptionClear (env);
+  }
+  (*env)->DeleteLocalRef (env, jmessage);
+}
+
+/* Retrieve errors from the bus and show them on the UI */
+static void
+error_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GError *err;
+  gchar *debug_info;
+  gchar *message_string;
+
+  gst_message_parse_error (msg, &err, &debug_info);
+  message_string =
+      g_strdup_printf ("Error received from element %s: %s",
+      GST_OBJECT_NAME (msg->src), err->message);
+  g_clear_error (&err);
+  g_free (debug_info);
+  set_ui_message (message_string, data);
+  g_free (message_string);
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+}
+
+/* Notify UI about pipeline state changes */
+static void
+state_changed_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GstState old_state, new_state, pending_state;
+  gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
+  /* Only pay attention to messages coming from the pipeline, not its children */
+  if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->pipeline)) {
+    gchar *message = g_strdup_printf ("State changed to %s",
+        gst_element_state_get_name (new_state));
+    set_ui_message (message, data);
+    g_free (message);
+  }
+}
+
+/* Check if all conditions are met to report GStreamer as initialized.
+ * These conditions will change depending on the application */
+static void
+check_initialization_complete (CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  if (!data->initialized && data->main_loop) {
+    GST_DEBUG ("Initialization complete, notifying application. main_loop:%p",
+        data->main_loop);
+    (*env)->CallVoidMethod (env, data->app, on_gstreamer_initialized_method_id);
+    if ((*env)->ExceptionCheck (env)) {
+      GST_ERROR ("Failed to call Java method");
+      (*env)->ExceptionClear (env);
+    }
+    data->initialized = TRUE;
+  }
+}
+
+/* Main method for the native code. This is executed on its own thread. */
+static void *
+app_function (void *userdata)
+{
+  JavaVMAttachArgs args;
+  GstBus *bus;
+  CustomData *data = (CustomData *) userdata;
+  GSource *bus_source;
+  GError *error = NULL;
+
+  GST_DEBUG ("Creating pipeline in CustomData at %p", data);
+
+  /* Create our own GLib Main Context and make it the default one */
+  data->context = g_main_context_new ();
+  g_main_context_push_thread_default (data->context);
+
+  /* Build pipeline */
+  data->pipeline =
+      gst_parse_launch
+      ("audiotestsrc ! audioconvert ! audioresample ! autoaudiosink", &error);
+  if (error) {
+    gchar *message =
+        g_strdup_printf ("Unable to build pipeline: %s", error->message);
+    g_clear_error (&error);
+    set_ui_message (message, data);
+    g_free (message);
+    return NULL;
+  }
+
+  /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
+  bus = gst_element_get_bus (data->pipeline);
+  bus_source = gst_bus_create_watch (bus);
+  g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func,
+      NULL, NULL);
+  g_source_attach (bus_source, data->context);
+  g_source_unref (bus_source);
+  g_signal_connect (G_OBJECT (bus), "message::error", (GCallback) error_cb,
+      data);
+  g_signal_connect (G_OBJECT (bus), "message::state-changed",
+      (GCallback) state_changed_cb, data);
+  gst_object_unref (bus);
+
+  /* Create a GLib Main Loop and set it to run */
+  GST_DEBUG ("Entering main loop... (CustomData:%p)", data);
+  data->main_loop = g_main_loop_new (data->context, FALSE);
+  check_initialization_complete (data);
+  g_main_loop_run (data->main_loop);
+  GST_DEBUG ("Exited main loop");
+  g_main_loop_unref (data->main_loop);
+  data->main_loop = NULL;
+
+  /* Free resources */
+  g_main_context_pop_thread_default (data->context);
+  g_main_context_unref (data->context);
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+  gst_object_unref (data->pipeline);
+
+  return NULL;
+}
+
+/*
+ * Java Bindings
+ */
+
+/* Instruct the native code to create its internal data structure, pipeline and thread */
+static void
+gst_native_init (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = g_new0 (CustomData, 1);
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
+  GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-2", 0,
+      "Android tutorial 2");
+  gst_debug_set_threshold_for_name ("tutorial-2", GST_LEVEL_DEBUG);
+  GST_DEBUG ("Created CustomData at %p", data);
+  data->app = (*env)->NewGlobalRef (env, thiz);
+  GST_DEBUG ("Created GlobalRef for app object at %p", data->app);
+  pthread_create (&gst_app_thread, NULL, &app_function, data);
+}
+
+/* Quit the main loop, remove the native thread and free resources */
+static void
+gst_native_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Quitting main loop...");
+  g_main_loop_quit (data->main_loop);
+  GST_DEBUG ("Waiting for thread to finish...");
+  pthread_join (gst_app_thread, NULL);
+  GST_DEBUG ("Deleting GlobalRef for app object at %p", data->app);
+  (*env)->DeleteGlobalRef (env, data->app);
+  GST_DEBUG ("Freeing CustomData at %p", data);
+  g_free (data);
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, NULL);
+  GST_DEBUG ("Done finalizing");
+}
+
+/* Set pipeline to PLAYING state */
+static void
+gst_native_play (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PLAYING");
+  gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+}
+
+/* Set pipeline to PAUSED state */
+static void
+gst_native_pause (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PAUSED");
+  gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+}
+
+/* Static class initializer: retrieve method and field IDs */
+static jboolean
+gst_native_class_init (JNIEnv * env, jclass klass)
+{
+  custom_data_field_id =
+      (*env)->GetFieldID (env, klass, "native_custom_data", "J");
+  set_message_method_id =
+      (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
+  on_gstreamer_initialized_method_id =
+      (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
+
+  if (!custom_data_field_id || !set_message_method_id
+      || !on_gstreamer_initialized_method_id) {
+    /* We emit this message through the Android log instead of the GStreamer log because the later
+     * has not been initialized yet.
+     */
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-2",
+        "The calling class does not implement all necessary interface methods");
+    return JNI_FALSE;
+  }
+  return JNI_TRUE;
+}
+
+/* List of implemented native methods */
+static JNINativeMethod native_methods[] = {
+  {"nativeInit", "()V", (void *) gst_native_init},
+  {"nativeFinalize", "()V", (void *) gst_native_finalize},
+  {"nativePlay", "()V", (void *) gst_native_play},
+  {"nativePause", "()V", (void *) gst_native_pause},
+  {"nativeClassInit", "()Z", (void *) gst_native_class_init}
+};
+
+/* Library initializer */
+jint
+JNI_OnLoad (JavaVM * vm, void *reserved)
+{
+  JNIEnv *env = NULL;
+
+  java_vm = vm;
+
+  if ((*vm)->GetEnv (vm, (void **) &env, JNI_VERSION_1_4) != JNI_OK) {
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-2",
+        "Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env,
+      "org/freedesktop/gstreamer/tutorials/tutorial_2/Tutorial2");
+  (*env)->RegisterNatives (env, klass, native_methods,
+      G_N_ELEMENTS (native_methods));
+
+  pthread_key_create (&current_jni_env, detach_current_thread);
+
+  return JNI_VERSION_1_4;
+}

examples/tutorials/android/android-tutorial-2/res/layout/main.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center_vertical"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/textview_message"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center_horizontal"
+        android:orientation="horizontal" >
+
+        <ImageButton
+            android:id="@+id/button_play"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_play"
+            android:src="@android:drawable/ic_media_play"
+            android:text="@string/button_play" />
+
+        <ImageButton
+            android:id="@+id/button_stop"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_stop"
+            android:src="@android:drawable/ic_media_pause"
+            android:text="@string/button_stop" />
+    </LinearLayout>
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-2/res/values/strings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">GStreamer tutorial 2</string>
+    <string name="button_play">Play</string>
+    <string name="button_stop">Stop</string>
+</resources>

examples/tutorials/android/android-tutorial-2/src/org/freedesktop/gstreamer/tutorials/tutorial_2/Tutorial2.java

@@ -0,0 +1,119 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_2;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.freedesktop.gstreamer.GStreamer;
+
+public class Tutorial2 extends Activity {
+    private native void nativeInit();     // Initialize native code, build pipeline, etc
+    private native void nativeFinalize(); // Destroy pipeline and shutdown native code
+    private native void nativePlay();     // Set pipeline to PLAYING
+    private native void nativePause();    // Set pipeline to PAUSED
+    private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
+    private long native_custom_data;      // Native code will use this to keep private data
+
+    private boolean is_playing_desired;   // Whether the user asked to go to PLAYING
+
+    // Called when the activity is first created.
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        // Initialize GStreamer and warn if it fails
+        try {
+            GStreamer.init(this);
+        } catch (Exception e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
+            return;
+        }
+
+        setContentView(R.layout.main);
+
+        ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
+        play.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = true;
+                nativePlay();
+            }
+        });
+
+        ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
+        pause.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = false;
+                nativePause();
+            }
+        });
+
+        if (savedInstanceState != null) {
+            is_playing_desired = savedInstanceState.getBoolean("playing");
+            Log.i ("GStreamer", "Activity created. Saved state is playing:" + is_playing_desired);
+        } else {
+            is_playing_desired = false;
+            Log.i ("GStreamer", "Activity created. There is no saved state, playing: false");
+        }
+
+        // Start with disabled buttons, until native code is initialized
+        this.findViewById(R.id.button_play).setEnabled(false);
+        this.findViewById(R.id.button_stop).setEnabled(false);
+
+        nativeInit();
+    }
+
+    protected void onSaveInstanceState (Bundle outState) {
+        Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired);
+        outState.putBoolean("playing", is_playing_desired);
+    }
+
+    protected void onDestroy() {
+        nativeFinalize();
+        super.onDestroy();
+    }
+
+    // Called from native code. This sets the content of the TextView from the UI thread.
+    private void setMessage(final String message) {
+        final TextView tv = (TextView) this.findViewById(R.id.textview_message);
+        runOnUiThread (new Runnable() {
+          public void run() {
+            tv.setText(message);
+          }
+        });
+    }
+
+    // Called from native code. Native code calls this once it has created its pipeline and
+    // the main loop is running, so it is ready to accept commands.
+    private void onGStreamerInitialized () {
+        Log.i ("GStreamer", "Gst initialized. Restoring state, playing:" + is_playing_desired);
+        // Restore previous playing state
+        if (is_playing_desired) {
+            nativePlay();
+        } else {
+            nativePause();
+        }
+
+        // Re-enable buttons, now that GStreamer is initialized
+        final Activity activity = this;
+        runOnUiThread(new Runnable() {
+            public void run() {
+                activity.findViewById(R.id.button_play).setEnabled(true);
+                activity.findViewById(R.id.button_stop).setEnabled(true);
+            }
+        });
+    }
+
+    static {
+        System.loadLibrary("gstreamer_android");
+        System.loadLibrary("tutorial-2");
+        nativeClassInit();
+    }
+
+}

examples/tutorials/android/android-tutorial-3/.gitignore

@@ -0,0 +1,4 @@
+.externalNativeBuild/
+assets/
+gst-build-*/
+src/org/freedesktop/gstreamer/GStreamer.java

examples/tutorials/android/android-tutorial-3/AndroidManifest.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.freedesktop.gstreamer.tutorials.tutorial_3"
+      android:versionCode="1"
+      android:versionName="1.0">
+    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="14"/>
+    <uses-feature android:glEsVersion="0x00020000"/>
+    <application android:label="@string/app_name"
+                 android:icon="@drawable/gstreamer_logo_3">
+        <activity android:name=".Tutorial3"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

examples/tutorials/android/android-tutorial-3/build.gradle

@@ -0,0 +1,73 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion '27.0.3'
+
+    defaultConfig {
+        applicationId "org.freedesktop.gstreamer.tutorials.tutorial_3"
+        minSdkVersion 15
+        targetSdkVersion 15
+        versionCode 1
+        versionName "1.0"
+
+
+        externalNativeBuild {
+            ndkBuild {
+                def gstRoot
+
+                if (project.hasProperty('gstAndroidRoot'))
+                    gstRoot = project.gstAndroidRoot
+                else
+                    gstRoot = System.env.GSTREAMER_ROOT_ANDROID
+
+                if (gstRoot == null)
+                    throw new GradleException('GSTREAMER_ROOT_ANDROID must be set, or "gstAndroidRoot" must be defined in your gradle.properties in the top level directory of the unpacked universal GStreamer Android binaries')
+
+                arguments "NDK_APPLICATION_MK=jni/Application.mk", "GSTREAMER_JAVA_SRC_DIR=src", "GSTREAMER_ROOT_ANDROID=$gstRoot", "GSTREAMER_ASSETS_DIR=src/assets"
+
+                targets "tutorial-3"
+
+                // All archs except MIPS and MIPS64 are supported
+                abiFilters  'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            sourceSets {
+                main {
+                    manifest.srcFile 'AndroidManifest.xml'
+                    java.srcDirs = ['src']
+                    resources.srcDirs = ['src']
+                    aidl.srcDirs = ['src']
+                    renderscript.srcDirs = ['src']
+                    res.srcDirs = ['res']
+                    assets.srcDirs = ['assets']
+                }
+            }
+        }
+    }
+
+    externalNativeBuild {
+        ndkBuild {
+            path 'jni/Android.mk'
+        }
+    }
+}
+
+afterEvaluate {
+    if (project.hasProperty('compileDebugJavaWithJavac'))
+        project.compileDebugJavaWithJavac.dependsOn 'externalNativeBuildDebug'
+    if (project.hasProperty('compileReleaseJavaWithJavac'))
+        project.compileReleaseJavaWithJavac.dependsOn 'externalNativeBuildRelease'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support:appcompat-v7:23.1.1'
+}

examples/tutorials/android/android-tutorial-3/jni/Android.mk

@@ -0,0 +1,34 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := tutorial-3
+LOCAL_SRC_FILES := tutorial-3.c dummy.cpp
+LOCAL_SHARED_LIBRARIES := gstreamer_android
+LOCAL_LDLIBS := -llog -landroid
+include $(BUILD_SHARED_LIBRARY)
+
+ifndef GSTREAMER_ROOT_ANDROID
+$(error GSTREAMER_ROOT_ANDROID is not defined!)
+endif
+
+ifeq ($(TARGET_ARCH_ABI),armeabi)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm
+else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
+else ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm64
+else ifeq ($(TARGET_ARCH_ABI),x86)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86
+else ifeq ($(TARGET_ARCH_ABI),x86_64)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86_64
+else
+$(error Target arch ABI not supported: $(TARGET_ARCH_ABI))
+endif
+
+GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build/
+include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
+GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_SYS) $(GSTREAMER_PLUGINS_EFFECTS)
+GSTREAMER_EXTRA_DEPS      := gstreamer-video-1.0 gobject-2.0
+GSTREAMER_EXTRA_LIBS      := -liconv
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

examples/tutorials/android/android-tutorial-3/jni/Application.mk

@@ -0,0 +1,2 @@
+APP_ABI = armeabi armeabi-v7a arm64-v8a x86 x86_64
+APP_STL = c++_shared

examples/tutorials/android/android-tutorial-3/jni/tutorial-3.c

@@ -0,0 +1,402 @@
+#include <string.h>
+#include <stdint.h>
+#include <jni.h>
+#include <android/log.h>
+#include <android/native_window.h>
+#include <android/native_window_jni.h>
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <pthread.h>
+
+GST_DEBUG_CATEGORY_STATIC (debug_category);
+#define GST_CAT_DEFAULT debug_category
+
+/*
+ * These macros provide a way to store the native pointer to CustomData, which might be 32 or 64 bits, into
+ * a jlong, which is always 64 bits, without warnings.
+ */
+#if GLIB_SIZEOF_VOID_P == 8
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)data)
+#else
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(jint)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)(jint)data)
+#endif
+
+/* Structure to contain all our information, so we can pass it to callbacks */
+typedef struct _CustomData
+{
+  jobject app;                  /* Application instance, used to call its methods. A global reference is kept. */
+  GstElement *pipeline;         /* The running pipeline */
+  GMainContext *context;        /* GLib context used to run the main loop */
+  GMainLoop *main_loop;         /* GLib main loop */
+  gboolean initialized;         /* To avoid informing the UI multiple times about the initialization */
+  GstElement *video_sink;       /* The video sink element which receives XOverlay commands */
+  ANativeWindow *native_window; /* The Android native window where video will be rendered */
+} CustomData;
+
+/* These global variables cache values which are not changing during execution */
+static pthread_t gst_app_thread;
+static pthread_key_t current_jni_env;
+static JavaVM *java_vm;
+static jfieldID custom_data_field_id;
+static jmethodID set_message_method_id;
+static jmethodID on_gstreamer_initialized_method_id;
+
+/*
+ * Private methods
+ */
+
+/* Register this thread with the VM */
+static JNIEnv *
+attach_current_thread (void)
+{
+  JNIEnv *env;
+  JavaVMAttachArgs args;
+
+  GST_DEBUG ("Attaching thread %p", g_thread_self ());
+  args.version = JNI_VERSION_1_4;
+  args.name = NULL;
+  args.group = NULL;
+
+  if ((*java_vm)->AttachCurrentThread (java_vm, &env, &args) < 0) {
+    GST_ERROR ("Failed to attach current thread");
+    return NULL;
+  }
+
+  return env;
+}
+
+/* Unregister this thread from the VM */
+static void
+detach_current_thread (void *env)
+{
+  GST_DEBUG ("Detaching thread %p", g_thread_self ());
+  (*java_vm)->DetachCurrentThread (java_vm);
+}
+
+/* Retrieve the JNI environment for this thread */
+static JNIEnv *
+get_jni_env (void)
+{
+  JNIEnv *env;
+
+  if ((env = pthread_getspecific (current_jni_env)) == NULL) {
+    env = attach_current_thread ();
+    pthread_setspecific (current_jni_env, env);
+  }
+
+  return env;
+}
+
+/* Change the content of the UI's TextView */
+static void
+set_ui_message (const gchar * message, CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  GST_DEBUG ("Setting message to: %s", message);
+  jstring jmessage = (*env)->NewStringUTF (env, message);
+  (*env)->CallVoidMethod (env, data->app, set_message_method_id, jmessage);
+  if ((*env)->ExceptionCheck (env)) {
+    GST_ERROR ("Failed to call Java method");
+    (*env)->ExceptionClear (env);
+  }
+  (*env)->DeleteLocalRef (env, jmessage);
+}
+
+/* Retrieve errors from the bus and show them on the UI */
+static void
+error_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GError *err;
+  gchar *debug_info;
+  gchar *message_string;
+
+  gst_message_parse_error (msg, &err, &debug_info);
+  message_string =
+      g_strdup_printf ("Error received from element %s: %s",
+      GST_OBJECT_NAME (msg->src), err->message);
+  g_clear_error (&err);
+  g_free (debug_info);
+  set_ui_message (message_string, data);
+  g_free (message_string);
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+}
+
+/* Notify UI about pipeline state changes */
+static void
+state_changed_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GstState old_state, new_state, pending_state;
+  gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
+  /* Only pay attention to messages coming from the pipeline, not its children */
+  if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->pipeline)) {
+    gchar *message = g_strdup_printf ("State changed to %s",
+        gst_element_state_get_name (new_state));
+    set_ui_message (message, data);
+    g_free (message);
+  }
+}
+
+/* Check if all conditions are met to report GStreamer as initialized.
+ * These conditions will change depending on the application */
+static void
+check_initialization_complete (CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  if (!data->initialized && data->native_window && data->main_loop) {
+    GST_DEBUG
+        ("Initialization complete, notifying application. native_window:%p main_loop:%p",
+        data->native_window, data->main_loop);
+
+    /* The main loop is running and we received a native window, inform the sink about it */
+    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->video_sink),
+        (guintptr) data->native_window);
+
+    (*env)->CallVoidMethod (env, data->app, on_gstreamer_initialized_method_id);
+    if ((*env)->ExceptionCheck (env)) {
+      GST_ERROR ("Failed to call Java method");
+      (*env)->ExceptionClear (env);
+    }
+    data->initialized = TRUE;
+  }
+}
+
+/* Main method for the native code. This is executed on its own thread. */
+static void *
+app_function (void *userdata)
+{
+  JavaVMAttachArgs args;
+  GstBus *bus;
+  CustomData *data = (CustomData *) userdata;
+  GSource *bus_source;
+  GError *error = NULL;
+
+  GST_DEBUG ("Creating pipeline in CustomData at %p", data);
+
+  /* Create our own GLib Main Context and make it the default one */
+  data->context = g_main_context_new ();
+  g_main_context_push_thread_default (data->context);
+
+  /* Build pipeline */
+  data->pipeline =
+      gst_parse_launch ("videotestsrc ! warptv ! videoconvert ! autovideosink",
+      &error);
+  if (error) {
+    gchar *message =
+        g_strdup_printf ("Unable to build pipeline: %s", error->message);
+    g_clear_error (&error);
+    set_ui_message (message, data);
+    g_free (message);
+    return NULL;
+  }
+
+  /* Set the pipeline to READY, so it can already accept a window handle, if we have one */
+  gst_element_set_state (data->pipeline, GST_STATE_READY);
+
+  data->video_sink =
+      gst_bin_get_by_interface (GST_BIN (data->pipeline),
+      GST_TYPE_VIDEO_OVERLAY);
+  if (!data->video_sink) {
+    GST_ERROR ("Could not retrieve video sink");
+    return NULL;
+  }
+
+  /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
+  bus = gst_element_get_bus (data->pipeline);
+  bus_source = gst_bus_create_watch (bus);
+  g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func,
+      NULL, NULL);
+  g_source_attach (bus_source, data->context);
+  g_source_unref (bus_source);
+  g_signal_connect (G_OBJECT (bus), "message::error", (GCallback) error_cb,
+      data);
+  g_signal_connect (G_OBJECT (bus), "message::state-changed",
+      (GCallback) state_changed_cb, data);
+  gst_object_unref (bus);
+
+  /* Create a GLib Main Loop and set it to run */
+  GST_DEBUG ("Entering main loop... (CustomData:%p)", data);
+  data->main_loop = g_main_loop_new (data->context, FALSE);
+  check_initialization_complete (data);
+  g_main_loop_run (data->main_loop);
+  GST_DEBUG ("Exited main loop");
+  g_main_loop_unref (data->main_loop);
+  data->main_loop = NULL;
+
+  /* Free resources */
+  g_main_context_pop_thread_default (data->context);
+  g_main_context_unref (data->context);
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+  gst_object_unref (data->video_sink);
+  gst_object_unref (data->pipeline);
+
+  return NULL;
+}
+
+/*
+ * Java Bindings
+ */
+
+/* Instruct the native code to create its internal data structure, pipeline and thread */
+static void
+gst_native_init (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = g_new0 (CustomData, 1);
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
+  GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-3", 0,
+      "Android tutorial 3");
+  gst_debug_set_threshold_for_name ("tutorial-3", GST_LEVEL_DEBUG);
+  GST_DEBUG ("Created CustomData at %p", data);
+  data->app = (*env)->NewGlobalRef (env, thiz);
+  GST_DEBUG ("Created GlobalRef for app object at %p", data->app);
+  pthread_create (&gst_app_thread, NULL, &app_function, data);
+}
+
+/* Quit the main loop, remove the native thread and free resources */
+static void
+gst_native_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Quitting main loop...");
+  g_main_loop_quit (data->main_loop);
+  GST_DEBUG ("Waiting for thread to finish...");
+  pthread_join (gst_app_thread, NULL);
+  GST_DEBUG ("Deleting GlobalRef for app object at %p", data->app);
+  (*env)->DeleteGlobalRef (env, data->app);
+  GST_DEBUG ("Freeing CustomData at %p", data);
+  g_free (data);
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, NULL);
+  GST_DEBUG ("Done finalizing");
+}
+
+/* Set pipeline to PLAYING state */
+static void
+gst_native_play (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PLAYING");
+  gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+}
+
+/* Set pipeline to PAUSED state */
+static void
+gst_native_pause (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PAUSED");
+  gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+}
+
+/* Static class initializer: retrieve method and field IDs */
+static jboolean
+gst_native_class_init (JNIEnv * env, jclass klass)
+{
+  custom_data_field_id =
+      (*env)->GetFieldID (env, klass, "native_custom_data", "J");
+  set_message_method_id =
+      (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
+  on_gstreamer_initialized_method_id =
+      (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
+
+  if (!custom_data_field_id || !set_message_method_id
+      || !on_gstreamer_initialized_method_id) {
+    /* We emit this message through the Android log instead of the GStreamer log because the later
+     * has not been initialized yet.
+     */
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-3",
+        "The calling class does not implement all necessary interface methods");
+    return JNI_FALSE;
+  }
+  return JNI_TRUE;
+}
+
+static void
+gst_native_surface_init (JNIEnv * env, jobject thiz, jobject surface)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  ANativeWindow *new_native_window = ANativeWindow_fromSurface (env, surface);
+  GST_DEBUG ("Received surface %p (native window %p)", surface,
+      new_native_window);
+
+  if (data->native_window) {
+    ANativeWindow_release (data->native_window);
+    if (data->native_window == new_native_window) {
+      GST_DEBUG ("New native window is the same as the previous one %p",
+          data->native_window);
+      if (data->video_sink) {
+        gst_video_overlay_expose (GST_VIDEO_OVERLAY (data->video_sink));
+        gst_video_overlay_expose (GST_VIDEO_OVERLAY (data->video_sink));
+      }
+      return;
+    } else {
+      GST_DEBUG ("Released previous native window %p", data->native_window);
+      data->initialized = FALSE;
+    }
+  }
+  data->native_window = new_native_window;
+
+  check_initialization_complete (data);
+}
+
+static void
+gst_native_surface_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Releasing Native Window %p", data->native_window);
+
+  if (data->video_sink) {
+    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->video_sink),
+        (guintptr) NULL);
+    gst_element_set_state (data->pipeline, GST_STATE_READY);
+  }
+
+  ANativeWindow_release (data->native_window);
+  data->native_window = NULL;
+  data->initialized = FALSE;
+}
+
+/* List of implemented native methods */
+static JNINativeMethod native_methods[] = {
+  {"nativeInit", "()V", (void *) gst_native_init},
+  {"nativeFinalize", "()V", (void *) gst_native_finalize},
+  {"nativePlay", "()V", (void *) gst_native_play},
+  {"nativePause", "()V", (void *) gst_native_pause},
+  {"nativeSurfaceInit", "(Ljava/lang/Object;)V",
+      (void *) gst_native_surface_init},
+  {"nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize},
+  {"nativeClassInit", "()Z", (void *) gst_native_class_init}
+};
+
+/* Library initializer */
+jint
+JNI_OnLoad (JavaVM * vm, void *reserved)
+{
+  JNIEnv *env = NULL;
+
+  java_vm = vm;
+
+  if ((*vm)->GetEnv (vm, (void **) &env, JNI_VERSION_1_4) != JNI_OK) {
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-3",
+        "Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env,
+      "org/freedesktop/gstreamer/tutorials/tutorial_3/Tutorial3");
+  (*env)->RegisterNatives (env, klass, native_methods,
+      G_N_ELEMENTS (native_methods));
+
+  pthread_key_create (&current_jni_env, detach_current_thread);
+
+  return JNI_VERSION_1_4;
+}

examples/tutorials/android/android-tutorial-3/res/layout/main.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center_vertical"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/textview_message"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal"
+        android:orientation="horizontal" >
+
+        <ImageButton
+            android:id="@+id/button_play"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_play"
+            android:src="@android:drawable/ic_media_play"
+            android:text="@string/button_play" />
+
+        <ImageButton
+            android:id="@+id/button_stop"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_stop"
+            android:src="@android:drawable/ic_media_pause"
+            android:text="@string/button_stop" />
+    </LinearLayout>
+
+    <org.freedesktop.gstreamer.tutorials.tutorial_3.GStreamerSurfaceView
+        android:id="@+id/surface_video"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical|center_horizontal" />
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-3/res/values/strings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">GStreamer tutorial 3</string>
+    <string name="button_play">Play</string>
+    <string name="button_stop">Stop</string>
+</resources>

examples/tutorials/android/android-tutorial-3/src/org/freedesktop/gstreamer/tutorials/tutorial_3/GStreamerSurfaceView.java

@@ -0,0 +1,85 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_3;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.SurfaceView;
+import android.view.View;
+
+// A simple SurfaceView whose width and height can be set from the outside
+public class GStreamerSurfaceView extends SurfaceView {
+    public int media_width = 320;
+    public int media_height = 240;
+
+    // Mandatory constructors, they do not do much
+    public GStreamerSurfaceView(Context context, AttributeSet attrs,
+            int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public GStreamerSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public GStreamerSurfaceView (Context context) {
+        super(context);
+    }
+
+    // Called by the layout manager to find out our size and give us some rules.
+    // We will try to maximize our size, and preserve the media's aspect ratio if
+    // we are given the freedom to do so.
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int width = 0, height = 0;
+        int wmode = View.MeasureSpec.getMode(widthMeasureSpec);
+        int hmode = View.MeasureSpec.getMode(heightMeasureSpec);
+        int wsize = View.MeasureSpec.getSize(widthMeasureSpec);
+        int hsize = View.MeasureSpec.getSize(heightMeasureSpec);
+
+        Log.i ("GStreamer", "onMeasure called with " + media_width + "x" + media_height);
+        // Obey width rules
+        switch (wmode) {
+        case View.MeasureSpec.AT_MOST:
+            if (hmode == View.MeasureSpec.EXACTLY) {
+                width = Math.min(hsize * media_width / media_height, wsize);
+                break;
+            }
+        case View.MeasureSpec.EXACTLY:
+            width = wsize;
+            break;
+        case View.MeasureSpec.UNSPECIFIED:
+            width = media_width;
+        }
+
+        // Obey height rules
+        switch (hmode) {
+        case View.MeasureSpec.AT_MOST:
+            if (wmode == View.MeasureSpec.EXACTLY) {
+                height = Math.min(wsize * media_height / media_width, hsize);
+                break;
+            }
+        case View.MeasureSpec.EXACTLY:
+            height = hsize;
+            break;
+        case View.MeasureSpec.UNSPECIFIED:
+            height = media_height;
+        }
+
+        // Finally, calculate best size when both axis are free
+        if (hmode == View.MeasureSpec.AT_MOST && wmode == View.MeasureSpec.AT_MOST) {
+            int correct_height = width * media_height / media_width;
+            int correct_width = height * media_width / media_height;
+
+            if (correct_height < height)
+                height = correct_height;
+            else
+                width = correct_width;
+        }
+
+        // Obey minimum size
+        width = Math.max (getSuggestedMinimumWidth(), width);
+        height = Math.max (getSuggestedMinimumHeight(), height);
+        setMeasuredDimension(width, height);
+    }
+
+}

examples/tutorials/android/android-tutorial-3/src/org/freedesktop/gstreamer/tutorials/tutorial_3/Tutorial3.java

@@ -0,0 +1,143 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_3;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.freedesktop.gstreamer.GStreamer;
+
+public class Tutorial3 extends Activity implements SurfaceHolder.Callback {
+    private native void nativeInit();     // Initialize native code, build pipeline, etc
+    private native void nativeFinalize(); // Destroy pipeline and shutdown native code
+    private native void nativePlay();     // Set pipeline to PLAYING
+    private native void nativePause();    // Set pipeline to PAUSED
+    private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
+    private native void nativeSurfaceInit(Object surface);
+    private native void nativeSurfaceFinalize();
+    private long native_custom_data;      // Native code will use this to keep private data
+
+    private boolean is_playing_desired;   // Whether the user asked to go to PLAYING
+
+    // Called when the activity is first created.
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        // Initialize GStreamer and warn if it fails
+        try {
+            GStreamer.init(this);
+        } catch (Exception e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
+            return;
+        }
+
+        setContentView(R.layout.main);
+
+        ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
+        play.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = true;
+                nativePlay();
+            }
+        });
+
+        ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
+        pause.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = false;
+                nativePause();
+            }
+        });
+
+        SurfaceView sv = (SurfaceView) this.findViewById(R.id.surface_video);
+        SurfaceHolder sh = sv.getHolder();
+        sh.addCallback(this);
+
+        if (savedInstanceState != null) {
+            is_playing_desired = savedInstanceState.getBoolean("playing");
+            Log.i ("GStreamer", "Activity created. Saved state is playing:" + is_playing_desired);
+        } else {
+            is_playing_desired = false;
+            Log.i ("GStreamer", "Activity created. There is no saved state, playing: false");
+        }
+
+        // Start with disabled buttons, until native code is initialized
+        this.findViewById(R.id.button_play).setEnabled(false);
+        this.findViewById(R.id.button_stop).setEnabled(false);
+
+        nativeInit();
+    }
+
+    protected void onSaveInstanceState (Bundle outState) {
+        Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired);
+        outState.putBoolean("playing", is_playing_desired);
+    }
+
+    protected void onDestroy() {
+        nativeFinalize();
+        super.onDestroy();
+    }
+
+    // Called from native code. This sets the content of the TextView from the UI thread.
+    private void setMessage(final String message) {
+        final TextView tv = (TextView) this.findViewById(R.id.textview_message);
+        runOnUiThread (new Runnable() {
+          public void run() {
+            tv.setText(message);
+          }
+        });
+    }
+
+    // Called from native code. Native code calls this once it has created its pipeline and
+    // the main loop is running, so it is ready to accept commands.
+    private void onGStreamerInitialized () {
+        Log.i ("GStreamer", "Gst initialized. Restoring state, playing:" + is_playing_desired);
+        // Restore previous playing state
+        if (is_playing_desired) {
+            nativePlay();
+        } else {
+            nativePause();
+        }
+
+        // Re-enable buttons, now that GStreamer is initialized
+        final Activity activity = this;
+        runOnUiThread(new Runnable() {
+            public void run() {
+                activity.findViewById(R.id.button_play).setEnabled(true);
+                activity.findViewById(R.id.button_stop).setEnabled(true);
+            }
+        });
+    }
+
+    static {
+        System.loadLibrary("gstreamer_android");
+        System.loadLibrary("tutorial-3");
+        nativeClassInit();
+    }
+
+    public void surfaceChanged(SurfaceHolder holder, int format, int width,
+            int height) {
+        Log.d("GStreamer", "Surface changed to format " + format + " width "
+                + width + " height " + height);
+        nativeSurfaceInit (holder.getSurface());
+    }
+
+    public void surfaceCreated(SurfaceHolder holder) {
+        Log.d("GStreamer", "Surface created: " + holder.getSurface());
+    }
+
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        Log.d("GStreamer", "Surface destroyed");
+        nativeSurfaceFinalize ();
+    }
+
+}

examples/tutorials/android/android-tutorial-4/.gitignore

@@ -0,0 +1,4 @@
+.externalNativeBuild/
+assets/
+gst-build-*/
+src/org/

examples/tutorials/android/android-tutorial-4/AndroidManifest.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.freedesktop.gstreamer.tutorials.tutorial_4"
+      android:versionCode="1"
+      android:versionName="1.0">
+    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="14"/>
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-feature android:glEsVersion="0x00020000"/>
+    <application android:label="@string/app_name"
+                 android:icon="@drawable/gstreamer_logo_4">
+        <activity android:name=".Tutorial4"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

examples/tutorials/android/android-tutorial-4/build.gradle

@@ -0,0 +1,73 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion '27.0.3'
+
+    defaultConfig {
+        applicationId "org.freedesktop.gstreamer.tutorials.tutorial_4"
+        minSdkVersion 15
+        targetSdkVersion 15
+        versionCode 1
+        versionName "1.0"
+
+
+        externalNativeBuild {
+            ndkBuild {
+                def gstRoot
+
+                if (project.hasProperty('gstAndroidRoot'))
+                    gstRoot = project.gstAndroidRoot
+                else
+                    gstRoot = System.env.GSTREAMER_ROOT_ANDROID
+
+                if (gstRoot == null)
+                    throw new GradleException('GSTREAMER_ROOT_ANDROID must be set, or "gstAndroidRoot" must be defined in your gradle.properties in the top level directory of the unpacked universal GStreamer Android binaries')
+
+                arguments "NDK_APPLICATION_MK=jni/Application.mk", "GSTREAMER_JAVA_SRC_DIR=src", "GSTREAMER_ROOT_ANDROID=$gstRoot", "GSTREAMER_ASSETS_DIR=src/assets"
+
+                targets "tutorial-4"
+
+                // All archs except MIPS and MIPS64 are supported
+                abiFilters  'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            sourceSets {
+                main {
+                    manifest.srcFile 'AndroidManifest.xml'
+                    java.srcDirs = ['src']
+                    resources.srcDirs = ['src']
+                    aidl.srcDirs = ['src']
+                    renderscript.srcDirs = ['src']
+                    res.srcDirs = ['res']
+                    assets.srcDirs = ['assets']
+                }
+            }
+        }
+    }
+
+    externalNativeBuild {
+        ndkBuild {
+            path 'jni/Android.mk'
+        }
+    }
+}
+
+afterEvaluate {
+    if (project.hasProperty('compileDebugJavaWithJavac'))
+        project.compileDebugJavaWithJavac.dependsOn 'externalNativeBuildDebug'
+    if (project.hasProperty('compileReleaseJavaWithJavac'))
+        project.compileReleaseJavaWithJavac.dependsOn 'externalNativeBuildRelease'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support:appcompat-v7:23.1.1'
+}

examples/tutorials/android/android-tutorial-4/jni/Android.mk

@@ -0,0 +1,34 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := tutorial-4
+LOCAL_SRC_FILES := tutorial-4.c dummy.cpp
+LOCAL_SHARED_LIBRARIES := gstreamer_android
+LOCAL_LDLIBS := -llog -landroid
+include $(BUILD_SHARED_LIBRARY)
+
+ifndef GSTREAMER_ROOT_ANDROID
+$(error GSTREAMER_ROOT_ANDROID is not defined!)
+endif
+
+ifeq ($(TARGET_ARCH_ABI),armeabi)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm
+else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
+else ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm64
+else ifeq ($(TARGET_ARCH_ABI),x86)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86
+else ifeq ($(TARGET_ARCH_ABI),x86_64)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86_64
+else
+$(error Target arch ABI not supported: $(TARGET_ARCH_ABI))
+endif
+
+GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build/
+include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
+GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_PLAYBACK) $(GSTREAMER_PLUGINS_CODECS) $(GSTREAMER_PLUGINS_NET) $(GSTREAMER_PLUGINS_SYS)
+G_IO_MODULES              := openssl
+GSTREAMER_EXTRA_DEPS      := gstreamer-video-1.0
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

examples/tutorials/android/android-tutorial-4/jni/Application.mk

@@ -0,0 +1,2 @@
+APP_ABI = armeabi armeabi-v7a arm64-v8a x86 x86_64
+APP_STL = c++_shared

examples/tutorials/android/android-tutorial-4/jni/tutorial-4.c

@@ -0,0 +1,673 @@
+#include <string.h>
+#include <stdint.h>
+#include <jni.h>
+#include <android/log.h>
+#include <android/native_window.h>
+#include <android/native_window_jni.h>
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <pthread.h>
+
+GST_DEBUG_CATEGORY_STATIC (debug_category);
+#define GST_CAT_DEFAULT debug_category
+
+/*
+ * These macros provide a way to store the native pointer to CustomData, which might be 32 or 64 bits, into
+ * a jlong, which is always 64 bits, without warnings.
+ */
+#if GLIB_SIZEOF_VOID_P == 8
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)data)
+#else
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(jint)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)(jint)data)
+#endif
+
+/* Do not allow seeks to be performed closer than this distance. It is visually useless, and will probably
+ * confuse some demuxers. */
+#define SEEK_MIN_DELAY (500 * GST_MSECOND)
+
+/* Structure to contain all our information, so we can pass it to callbacks */
+typedef struct _CustomData
+{
+  jobject app;                  /* Application instance, used to call its methods. A global reference is kept. */
+  GstElement *pipeline;         /* The running pipeline */
+  GMainContext *context;        /* GLib context used to run the main loop */
+  GMainLoop *main_loop;         /* GLib main loop */
+  gboolean initialized;         /* To avoid informing the UI multiple times about the initialization */
+  ANativeWindow *native_window; /* The Android native window where video will be rendered */
+  GstState state;               /* Current pipeline state */
+  GstState target_state;        /* Desired pipeline state, to be set once buffering is complete */
+  gint64 duration;              /* Cached clip duration */
+  gint64 desired_position;      /* Position to seek to, once the pipeline is running */
+  GstClockTime last_seek_time;  /* For seeking overflow prevention (throttling) */
+  gboolean is_live;             /* Live streams do not use buffering */
+} CustomData;
+
+/* playbin flags */
+typedef enum
+{
+  GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
+} GstPlayFlags;
+
+/* These global variables cache values which are not changing during execution */
+static pthread_t gst_app_thread;
+static pthread_key_t current_jni_env;
+static JavaVM *java_vm;
+static jfieldID custom_data_field_id;
+static jmethodID set_message_method_id;
+static jmethodID set_current_position_method_id;
+static jmethodID on_gstreamer_initialized_method_id;
+static jmethodID on_media_size_changed_method_id;
+
+/*
+ * Private methods
+ */
+
+/* Register this thread with the VM */
+static JNIEnv *
+attach_current_thread (void)
+{
+  JNIEnv *env;
+  JavaVMAttachArgs args;
+
+  GST_DEBUG ("Attaching thread %p", g_thread_self ());
+  args.version = JNI_VERSION_1_4;
+  args.name = NULL;
+  args.group = NULL;
+
+  if ((*java_vm)->AttachCurrentThread (java_vm, &env, &args) < 0) {
+    GST_ERROR ("Failed to attach current thread");
+    return NULL;
+  }
+
+  return env;
+}
+
+/* Unregister this thread from the VM */
+static void
+detach_current_thread (void *env)
+{
+  GST_DEBUG ("Detaching thread %p", g_thread_self ());
+  (*java_vm)->DetachCurrentThread (java_vm);
+}
+
+/* Retrieve the JNI environment for this thread */
+static JNIEnv *
+get_jni_env (void)
+{
+  JNIEnv *env;
+
+  if ((env = pthread_getspecific (current_jni_env)) == NULL) {
+    env = attach_current_thread ();
+    pthread_setspecific (current_jni_env, env);
+  }
+
+  return env;
+}
+
+/* Change the content of the UI's TextView */
+static void
+set_ui_message (const gchar * message, CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  GST_DEBUG ("Setting message to: %s", message);
+  jstring jmessage = (*env)->NewStringUTF (env, message);
+  (*env)->CallVoidMethod (env, data->app, set_message_method_id, jmessage);
+  if ((*env)->ExceptionCheck (env)) {
+    GST_ERROR ("Failed to call Java method");
+    (*env)->ExceptionClear (env);
+  }
+  (*env)->DeleteLocalRef (env, jmessage);
+}
+
+/* Tell the application what is the current position and clip duration */
+static void
+set_current_ui_position (gint position, gint duration, CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  (*env)->CallVoidMethod (env, data->app, set_current_position_method_id,
+      position, duration);
+  if ((*env)->ExceptionCheck (env)) {
+    GST_ERROR ("Failed to call Java method");
+    (*env)->ExceptionClear (env);
+  }
+}
+
+/* If we have pipeline and it is running, query the current position and clip duration and inform
+ * the application */
+static gboolean
+refresh_ui (CustomData * data)
+{
+  gint64 current = -1;
+  gint64 position;
+
+  /* We do not want to update anything unless we have a working pipeline in the PAUSED or PLAYING state */
+  if (!data || !data->pipeline || data->state < GST_STATE_PAUSED)
+    return TRUE;
+
+  /* If we didn't know it yet, query the stream duration */
+  if (!GST_CLOCK_TIME_IS_VALID (data->duration)) {
+    if (!gst_element_query_duration (data->pipeline, GST_FORMAT_TIME,
+            &data->duration)) {
+      GST_WARNING ("Could not query current duration");
+    }
+  }
+
+  if (gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position)) {
+    /* Java expects these values in milliseconds, and GStreamer provides nanoseconds */
+    set_current_ui_position (position / GST_MSECOND,
+        data->duration / GST_MSECOND, data);
+  }
+  return TRUE;
+}
+
+/* Forward declaration for the delayed seek callback */
+static gboolean delayed_seek_cb (CustomData * data);
+
+/* Perform seek, if we are not too close to the previous seek. Otherwise, schedule the seek for
+ * some time in the future. */
+static void
+execute_seek (gint64 desired_position, CustomData * data)
+{
+  gint64 diff;
+
+  if (desired_position == GST_CLOCK_TIME_NONE)
+    return;
+
+  diff = gst_util_get_timestamp () - data->last_seek_time;
+
+  if (GST_CLOCK_TIME_IS_VALID (data->last_seek_time) && diff < SEEK_MIN_DELAY) {
+    /* The previous seek was too close, delay this one */
+    GSource *timeout_source;
+
+    if (data->desired_position == GST_CLOCK_TIME_NONE) {
+      /* There was no previous seek scheduled. Setup a timer for some time in the future */
+      timeout_source =
+          g_timeout_source_new ((SEEK_MIN_DELAY - diff) / GST_MSECOND);
+      g_source_set_callback (timeout_source, (GSourceFunc) delayed_seek_cb,
+          data, NULL);
+      g_source_attach (timeout_source, data->context);
+      g_source_unref (timeout_source);
+    }
+    /* Update the desired seek position. If multiple requests are received before it is time
+     * to perform a seek, only the last one is remembered. */
+    data->desired_position = desired_position;
+    GST_DEBUG ("Throttling seek to %" GST_TIME_FORMAT ", will be in %"
+        GST_TIME_FORMAT, GST_TIME_ARGS (desired_position),
+        GST_TIME_ARGS (SEEK_MIN_DELAY - diff));
+  } else {
+    /* Perform the seek now */
+    GST_DEBUG ("Seeking to %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (desired_position));
+    data->last_seek_time = gst_util_get_timestamp ();
+    gst_element_seek_simple (data->pipeline, GST_FORMAT_TIME,
+        GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, desired_position);
+    data->desired_position = GST_CLOCK_TIME_NONE;
+  }
+}
+
+/* Delayed seek callback. This gets called by the timer setup in the above function. */
+static gboolean
+delayed_seek_cb (CustomData * data)
+{
+  GST_DEBUG ("Doing delayed seek to %" GST_TIME_FORMAT,
+      GST_TIME_ARGS (data->desired_position));
+  execute_seek (data->desired_position, data);
+  return FALSE;
+}
+
+/* Retrieve errors from the bus and show them on the UI */
+static void
+error_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GError *err;
+  gchar *debug_info;
+  gchar *message_string;
+
+  gst_message_parse_error (msg, &err, &debug_info);
+  message_string =
+      g_strdup_printf ("Error received from element %s: %s",
+      GST_OBJECT_NAME (msg->src), err->message);
+  g_clear_error (&err);
+  g_free (debug_info);
+  set_ui_message (message_string, data);
+  g_free (message_string);
+  data->target_state = GST_STATE_NULL;
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+}
+
+/* Called when the End Of the Stream is reached. Just move to the beginning of the media and pause. */
+static void
+eos_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  data->target_state = GST_STATE_PAUSED;
+  data->is_live =
+      (gst_element_set_state (data->pipeline,
+          GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
+  execute_seek (0, data);
+}
+
+/* Called when the duration of the media changes. Just mark it as unknown, so we re-query it in the next UI refresh. */
+static void
+duration_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  data->duration = GST_CLOCK_TIME_NONE;
+}
+
+/* Called when buffering messages are received. We inform the UI about the current buffering level and
+ * keep the pipeline paused until 100% buffering is reached. At that point, set the desired state. */
+static void
+buffering_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  gint percent;
+
+  if (data->is_live)
+    return;
+
+  gst_message_parse_buffering (msg, &percent);
+  if (percent < 100 && data->target_state >= GST_STATE_PAUSED) {
+    gchar *message_string = g_strdup_printf ("Buffering %d%%", percent);
+    gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+    set_ui_message (message_string, data);
+    g_free (message_string);
+  } else if (data->target_state >= GST_STATE_PLAYING) {
+    gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+  } else if (data->target_state >= GST_STATE_PAUSED) {
+    set_ui_message ("Buffering complete", data);
+  }
+}
+
+/* Called when the clock is lost */
+static void
+clock_lost_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  if (data->target_state >= GST_STATE_PLAYING) {
+    gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+    gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+  }
+}
+
+/* Retrieve the video sink's Caps and tell the application about the media size */
+static void
+check_media_size (CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  GstElement *video_sink;
+  GstPad *video_sink_pad;
+  GstCaps *caps;
+  GstVideoInfo info;
+
+  /* Retrieve the Caps at the entrance of the video sink */
+  g_object_get (data->pipeline, "video-sink", &video_sink, NULL);
+  video_sink_pad = gst_element_get_static_pad (video_sink, "sink");
+  caps = gst_pad_get_current_caps (video_sink_pad);
+
+  if (gst_video_info_from_caps (&info, caps)) {
+    info.width = info.width * info.par_n / info.par_d;
+    GST_DEBUG ("Media size is %dx%d, notifying application", info.width,
+        info.height);
+
+    (*env)->CallVoidMethod (env, data->app, on_media_size_changed_method_id,
+        (jint) info.width, (jint) info.height);
+    if ((*env)->ExceptionCheck (env)) {
+      GST_ERROR ("Failed to call Java method");
+      (*env)->ExceptionClear (env);
+    }
+  }
+
+  gst_caps_unref (caps);
+  gst_object_unref (video_sink_pad);
+  gst_object_unref (video_sink);
+}
+
+/* Notify UI about pipeline state changes */
+static void
+state_changed_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GstState old_state, new_state, pending_state;
+  gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
+  /* Only pay attention to messages coming from the pipeline, not its children */
+  if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->pipeline)) {
+    data->state = new_state;
+    gchar *message = g_strdup_printf ("State changed to %s",
+        gst_element_state_get_name (new_state));
+    set_ui_message (message, data);
+    g_free (message);
+
+    /* The Ready to Paused state change is particularly interesting: */
+    if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED) {
+      /* By now the sink already knows the media size */
+      check_media_size (data);
+
+      /* If there was a scheduled seek, perform it now that we have moved to the Paused state */
+      if (GST_CLOCK_TIME_IS_VALID (data->desired_position))
+        execute_seek (data->desired_position, data);
+    }
+  }
+}
+
+/* Check if all conditions are met to report GStreamer as initialized.
+ * These conditions will change depending on the application */
+static void
+check_initialization_complete (CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  if (!data->initialized && data->native_window && data->main_loop) {
+    GST_DEBUG
+        ("Initialization complete, notifying application. native_window:%p main_loop:%p",
+        data->native_window, data->main_loop);
+
+    /* The main loop is running and we received a native window, inform the sink about it */
+    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->pipeline),
+        (guintptr) data->native_window);
+
+    (*env)->CallVoidMethod (env, data->app, on_gstreamer_initialized_method_id);
+    if ((*env)->ExceptionCheck (env)) {
+      GST_ERROR ("Failed to call Java method");
+      (*env)->ExceptionClear (env);
+    }
+    data->initialized = TRUE;
+  }
+}
+
+/* Main method for the native code. This is executed on its own thread. */
+static void *
+app_function (void *userdata)
+{
+  JavaVMAttachArgs args;
+  GstBus *bus;
+  CustomData *data = (CustomData *) userdata;
+  GSource *timeout_source;
+  GSource *bus_source;
+  GError *error = NULL;
+  guint flags;
+
+  GST_DEBUG ("Creating pipeline in CustomData at %p", data);
+
+  /* Create our own GLib Main Context and make it the default one */
+  data->context = g_main_context_new ();
+  g_main_context_push_thread_default (data->context);
+
+  /* Build pipeline */
+  data->pipeline = gst_parse_launch ("playbin", &error);
+  if (error) {
+    gchar *message =
+        g_strdup_printf ("Unable to build pipeline: %s", error->message);
+    g_clear_error (&error);
+    set_ui_message (message, data);
+    g_free (message);
+    return NULL;
+  }
+
+  /* Disable subtitles */
+  g_object_get (data->pipeline, "flags", &flags, NULL);
+  flags &= ~GST_PLAY_FLAG_TEXT;
+  g_object_set (data->pipeline, "flags", flags, NULL);
+
+  /* Set the pipeline to READY, so it can already accept a window handle, if we have one */
+  data->target_state = GST_STATE_READY;
+  gst_element_set_state (data->pipeline, GST_STATE_READY);
+
+  /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
+  bus = gst_element_get_bus (data->pipeline);
+  bus_source = gst_bus_create_watch (bus);
+  g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func,
+      NULL, NULL);
+  g_source_attach (bus_source, data->context);
+  g_source_unref (bus_source);
+  g_signal_connect (G_OBJECT (bus), "message::error", (GCallback) error_cb,
+      data);
+  g_signal_connect (G_OBJECT (bus), "message::eos", (GCallback) eos_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::state-changed",
+      (GCallback) state_changed_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::duration",
+      (GCallback) duration_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::buffering",
+      (GCallback) buffering_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::clock-lost",
+      (GCallback) clock_lost_cb, data);
+  gst_object_unref (bus);
+
+  /* Register a function that GLib will call 4 times per second */
+  timeout_source = g_timeout_source_new (250);
+  g_source_set_callback (timeout_source, (GSourceFunc) refresh_ui, data, NULL);
+  g_source_attach (timeout_source, data->context);
+  g_source_unref (timeout_source);
+
+  /* Create a GLib Main Loop and set it to run */
+  GST_DEBUG ("Entering main loop... (CustomData:%p)", data);
+  data->main_loop = g_main_loop_new (data->context, FALSE);
+  check_initialization_complete (data);
+  g_main_loop_run (data->main_loop);
+  GST_DEBUG ("Exited main loop");
+  g_main_loop_unref (data->main_loop);
+  data->main_loop = NULL;
+
+  /* Free resources */
+  g_main_context_pop_thread_default (data->context);
+  g_main_context_unref (data->context);
+  data->target_state = GST_STATE_NULL;
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+  gst_object_unref (data->pipeline);
+
+  return NULL;
+}
+
+/*
+ * Java Bindings
+ */
+
+/* Instruct the native code to create its internal data structure, pipeline and thread */
+static void
+gst_native_init (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = g_new0 (CustomData, 1);
+  data->desired_position = GST_CLOCK_TIME_NONE;
+  data->last_seek_time = GST_CLOCK_TIME_NONE;
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
+  GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-4", 0,
+      "Android tutorial 4");
+  gst_debug_set_threshold_for_name ("tutorial-4", GST_LEVEL_DEBUG);
+  GST_DEBUG ("Created CustomData at %p", data);
+  data->app = (*env)->NewGlobalRef (env, thiz);
+  GST_DEBUG ("Created GlobalRef for app object at %p", data->app);
+  pthread_create (&gst_app_thread, NULL, &app_function, data);
+}
+
+/* Quit the main loop, remove the native thread and free resources */
+static void
+gst_native_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Quitting main loop...");
+  g_main_loop_quit (data->main_loop);
+  GST_DEBUG ("Waiting for thread to finish...");
+  pthread_join (gst_app_thread, NULL);
+  GST_DEBUG ("Deleting GlobalRef for app object at %p", data->app);
+  (*env)->DeleteGlobalRef (env, data->app);
+  GST_DEBUG ("Freeing CustomData at %p", data);
+  g_free (data);
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, NULL);
+  GST_DEBUG ("Done finalizing");
+}
+
+/* Set playbin's URI */
+void
+gst_native_set_uri (JNIEnv * env, jobject thiz, jstring uri)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data || !data->pipeline)
+    return;
+  const gchar *char_uri = (*env)->GetStringUTFChars (env, uri, NULL);
+  GST_DEBUG ("Setting URI to %s", char_uri);
+  if (data->target_state >= GST_STATE_READY)
+    gst_element_set_state (data->pipeline, GST_STATE_READY);
+  g_object_set (data->pipeline, "uri", char_uri, NULL);
+  (*env)->ReleaseStringUTFChars (env, uri, char_uri);
+  data->duration = GST_CLOCK_TIME_NONE;
+  data->is_live =
+      (gst_element_set_state (data->pipeline,
+          data->target_state) == GST_STATE_CHANGE_NO_PREROLL);
+}
+
+/* Set pipeline to PLAYING state */
+static void
+gst_native_play (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PLAYING");
+  data->target_state = GST_STATE_PLAYING;
+  data->is_live =
+      (gst_element_set_state (data->pipeline,
+          GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
+}
+
+/* Set pipeline to PAUSED state */
+static void
+gst_native_pause (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PAUSED");
+  data->target_state = GST_STATE_PAUSED;
+  data->is_live =
+      (gst_element_set_state (data->pipeline,
+          GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
+}
+
+/* Instruct the pipeline to seek to a different position */
+void
+gst_native_set_position (JNIEnv * env, jobject thiz, int milliseconds)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  gint64 desired_position = (gint64) (milliseconds * GST_MSECOND);
+  if (data->state >= GST_STATE_PAUSED) {
+    execute_seek (desired_position, data);
+  } else {
+    GST_DEBUG ("Scheduling seek to %" GST_TIME_FORMAT " for later",
+        GST_TIME_ARGS (desired_position));
+    data->desired_position = desired_position;
+  }
+}
+
+/* Static class initializer: retrieve method and field IDs */
+static jboolean
+gst_native_class_init (JNIEnv * env, jclass klass)
+{
+  custom_data_field_id =
+      (*env)->GetFieldID (env, klass, "native_custom_data", "J");
+  set_message_method_id =
+      (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
+  set_current_position_method_id =
+      (*env)->GetMethodID (env, klass, "setCurrentPosition", "(II)V");
+  on_gstreamer_initialized_method_id =
+      (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
+  on_media_size_changed_method_id =
+      (*env)->GetMethodID (env, klass, "onMediaSizeChanged", "(II)V");
+
+  if (!custom_data_field_id || !set_message_method_id
+      || !on_gstreamer_initialized_method_id || !on_media_size_changed_method_id
+      || !set_current_position_method_id) {
+    /* We emit this message through the Android log instead of the GStreamer log because the later
+     * has not been initialized yet.
+     */
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-4",
+        "The calling class does not implement all necessary interface methods");
+    return JNI_FALSE;
+  }
+  return JNI_TRUE;
+}
+
+static void
+gst_native_surface_init (JNIEnv * env, jobject thiz, jobject surface)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  ANativeWindow *new_native_window = ANativeWindow_fromSurface (env, surface);
+  GST_DEBUG ("Received surface %p (native window %p)", surface,
+      new_native_window);
+
+  if (data->native_window) {
+    ANativeWindow_release (data->native_window);
+    if (data->native_window == new_native_window) {
+      GST_DEBUG ("New native window is the same as the previous one %p",
+          data->native_window);
+      if (data->pipeline) {
+        gst_video_overlay_expose (GST_VIDEO_OVERLAY (data->pipeline));
+        gst_video_overlay_expose (GST_VIDEO_OVERLAY (data->pipeline));
+      }
+      return;
+    } else {
+      GST_DEBUG ("Released previous native window %p", data->native_window);
+      data->initialized = FALSE;
+    }
+  }
+  data->native_window = new_native_window;
+
+  check_initialization_complete (data);
+}
+
+static void
+gst_native_surface_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Releasing Native Window %p", data->native_window);
+
+  if (data->pipeline) {
+    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->pipeline),
+        (guintptr) NULL);
+    gst_element_set_state (data->pipeline, GST_STATE_READY);
+  }
+
+  ANativeWindow_release (data->native_window);
+  data->native_window = NULL;
+  data->initialized = FALSE;
+}
+
+/* List of implemented native methods */
+static JNINativeMethod native_methods[] = {
+  {"nativeInit", "()V", (void *) gst_native_init},
+  {"nativeFinalize", "()V", (void *) gst_native_finalize},
+  {"nativeSetUri", "(Ljava/lang/String;)V", (void *) gst_native_set_uri},
+  {"nativePlay", "()V", (void *) gst_native_play},
+  {"nativePause", "()V", (void *) gst_native_pause},
+  {"nativeSetPosition", "(I)V", (void *) gst_native_set_position},
+  {"nativeSurfaceInit", "(Ljava/lang/Object;)V",
+      (void *) gst_native_surface_init},
+  {"nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize},
+  {"nativeClassInit", "()Z", (void *) gst_native_class_init}
+};
+
+/* Library initializer */
+jint
+JNI_OnLoad (JavaVM * vm, void *reserved)
+{
+  JNIEnv *env = NULL;
+
+  java_vm = vm;
+
+  if ((*vm)->GetEnv (vm, (void **) &env, JNI_VERSION_1_4) != JNI_OK) {
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-4",
+        "Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env,
+      "org/freedesktop/gstreamer/tutorials/tutorial_4/Tutorial4");
+  (*env)->RegisterNatives (env, klass, native_methods,
+      G_N_ELEMENTS (native_methods));
+
+  pthread_key_create (&current_jni_env, detach_current_thread);
+
+  return JNI_VERSION_1_4;
+}

examples/tutorials/android/android-tutorial-4/res/layout/main.xml

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center_vertical"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/textview_message"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal"
+        android:orientation="horizontal" >
+
+        <ImageButton
+            android:id="@+id/button_play"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_play"
+            android:src="@android:drawable/ic_media_play"
+            android:text="@string/button_play" />
+
+        <ImageButton
+            android:id="@+id/button_stop"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_stop"
+            android:src="@android:drawable/ic_media_pause"
+            android:text="@string/button_stop" />
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal"
+        android:orientation="horizontal" >
+
+        <TextView
+            android:id="@+id/textview_time"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginLeft="5dip"
+            android:layout_marginRight="5dip" />
+
+        <SeekBar
+            android:id="@+id/seek_bar"
+            android:layout_width="0dip"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_weight="1"
+            android:indeterminate="false" />
+    </LinearLayout>
+
+    <org.freedesktop.gstreamer.tutorials.tutorial_4.GStreamerSurfaceView
+        android:id="@+id/surface_video"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical|center_horizontal" />
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-4/res/values/strings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">GStreamer tutorial 4</string>
+    <string name="button_play">Play</string>
+    <string name="button_stop">Stop</string>
+</resources>

examples/tutorials/android/android-tutorial-4/src/org/freedesktop/gstreamer/tutorials/tutorial_4/GStreamerSurfaceView.java

@@ -0,0 +1,85 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_4;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.SurfaceView;
+import android.view.View;
+
+// A simple SurfaceView whose width and height can be set from the outside
+public class GStreamerSurfaceView extends SurfaceView {
+    public int media_width = 320;
+    public int media_height = 240;
+
+    // Mandatory constructors, they do not do much
+    public GStreamerSurfaceView(Context context, AttributeSet attrs,
+            int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public GStreamerSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public GStreamerSurfaceView (Context context) {
+        super(context);
+    }
+
+    // Called by the layout manager to find out our size and give us some rules.
+    // We will try to maximize our size, and preserve the media's aspect ratio if
+    // we are given the freedom to do so.
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int width = 0, height = 0;
+        int wmode = View.MeasureSpec.getMode(widthMeasureSpec);
+        int hmode = View.MeasureSpec.getMode(heightMeasureSpec);
+        int wsize = View.MeasureSpec.getSize(widthMeasureSpec);
+        int hsize = View.MeasureSpec.getSize(heightMeasureSpec);
+
+        Log.i ("GStreamer", "onMeasure called with " + media_width + "x" + media_height);
+        // Obey width rules
+        switch (wmode) {
+        case View.MeasureSpec.AT_MOST:
+            if (hmode == View.MeasureSpec.EXACTLY) {
+                width = Math.min(hsize * media_width / media_height, wsize);
+                break;
+            }
+        case View.MeasureSpec.EXACTLY:
+            width = wsize;
+            break;
+        case View.MeasureSpec.UNSPECIFIED:
+            width = media_width;
+        }
+
+        // Obey height rules
+        switch (hmode) {
+        case View.MeasureSpec.AT_MOST:
+            if (wmode == View.MeasureSpec.EXACTLY) {
+                height = Math.min(wsize * media_height / media_width, hsize);
+                break;
+            }
+        case View.MeasureSpec.EXACTLY:
+            height = hsize;
+            break;
+        case View.MeasureSpec.UNSPECIFIED:
+            height = media_height;
+        }
+
+        // Finally, calculate best size when both axis are free
+        if (hmode == View.MeasureSpec.AT_MOST && wmode == View.MeasureSpec.AT_MOST) {
+            int correct_height = width * media_height / media_width;
+            int correct_width = height * media_width / media_height;
+
+            if (correct_height < height)
+                height = correct_height;
+            else
+                width = correct_width;
+        }
+
+        // Obey minimum size
+        width = Math.max (getSuggestedMinimumWidth(), width);
+        height = Math.max (getSuggestedMinimumHeight(), height);
+        setMeasuredDimension(width, height);
+    }
+
+}

examples/tutorials/android/android-tutorial-4/src/org/freedesktop/gstreamer/tutorials/tutorial_4/Tutorial4.java

@@ -0,0 +1,250 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_4;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.TimeZone;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.SeekBar;
+import android.widget.SeekBar.OnSeekBarChangeListener;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.freedesktop.gstreamer.GStreamer;
+
+public class Tutorial4 extends Activity implements SurfaceHolder.Callback, OnSeekBarChangeListener {
+    private native void nativeInit();     // Initialize native code, build pipeline, etc
+    private native void nativeFinalize(); // Destroy pipeline and shutdown native code
+    private native void nativeSetUri(String uri); // Set the URI of the media to play
+    private native void nativePlay();     // Set pipeline to PLAYING
+    private native void nativeSetPosition(int milliseconds); // Seek to the indicated position, in milliseconds
+    private native void nativePause();    // Set pipeline to PAUSED
+    private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
+    private native void nativeSurfaceInit(Object surface); // A new surface is available
+    private native void nativeSurfaceFinalize(); // Surface about to be destroyed
+    private long native_custom_data;      // Native code will use this to keep private data
+
+    private boolean is_playing_desired;   // Whether the user asked to go to PLAYING
+    private int position;                 // Current position, reported by native code
+    private int duration;                 // Current clip duration, reported by native code
+    private boolean is_local_media;       // Whether this clip is stored locally or is being streamed
+    private int desired_position;         // Position where the users wants to seek to
+    private String mediaUri;              // URI of the clip being played
+
+    private final String defaultMediaUri = "https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.ogv";
+
+    // Called when the activity is first created.
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        // Initialize GStreamer and warn if it fails
+        try {
+            GStreamer.init(this);
+        } catch (Exception e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
+            return;
+        }
+
+        setContentView(R.layout.main);
+
+        ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
+        play.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = true;
+                nativePlay();
+            }
+        });
+
+        ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
+        pause.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = false;
+                nativePause();
+            }
+        });
+
+        SurfaceView sv = (SurfaceView) this.findViewById(R.id.surface_video);
+        SurfaceHolder sh = sv.getHolder();
+        sh.addCallback(this);
+
+        SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
+        sb.setOnSeekBarChangeListener(this);
+
+        // Retrieve our previous state, or initialize it to default values
+        if (savedInstanceState != null) {
+            is_playing_desired = savedInstanceState.getBoolean("playing");
+            position = savedInstanceState.getInt("position");
+            duration = savedInstanceState.getInt("duration");
+            mediaUri = savedInstanceState.getString("mediaUri");
+            Log.i ("GStreamer", "Activity created with saved state:");
+        } else {
+            is_playing_desired = false;
+            position = duration = 0;
+            mediaUri = defaultMediaUri;
+            Log.i ("GStreamer", "Activity created with no saved state:");
+        }
+        is_local_media = false;
+        Log.i ("GStreamer", "  playing:" + is_playing_desired + " position:" + position +
+                " duration: " + duration + " uri: " + mediaUri);
+
+        // Start with disabled buttons, until native code is initialized
+        this.findViewById(R.id.button_play).setEnabled(false);
+        this.findViewById(R.id.button_stop).setEnabled(false);
+
+        nativeInit();
+    }
+
+    protected void onSaveInstanceState (Bundle outState) {
+        Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired + " position:" + position +
+                " duration: " + duration + " uri: " + mediaUri);
+        outState.putBoolean("playing", is_playing_desired);
+        outState.putInt("position", position);
+        outState.putInt("duration", duration);
+        outState.putString("mediaUri", mediaUri);
+    }
+
+    protected void onDestroy() {
+        nativeFinalize();
+        super.onDestroy();
+    }
+
+    // Called from native code. This sets the content of the TextView from the UI thread.
+    private void setMessage(final String message) {
+        final TextView tv = (TextView) this.findViewById(R.id.textview_message);
+        runOnUiThread (new Runnable() {
+          public void run() {
+            tv.setText(message);
+          }
+        });
+    }
+
+    // Set the URI to play, and record whether it is a local or remote file
+    private void setMediaUri() {
+        nativeSetUri (mediaUri);
+        is_local_media = mediaUri.startsWith("file://");
+    }
+
+    // Called from native code. Native code calls this once it has created its pipeline and
+    // the main loop is running, so it is ready to accept commands.
+    private void onGStreamerInitialized () {
+        Log.i ("GStreamer", "GStreamer initialized:");
+        Log.i ("GStreamer", "  playing:" + is_playing_desired + " position:" + position + " uri: " + mediaUri);
+
+        // Restore previous playing state
+        setMediaUri ();
+        nativeSetPosition (position);
+        if (is_playing_desired) {
+            nativePlay();
+        } else {
+            nativePause();
+        }
+
+        // Re-enable buttons, now that GStreamer is initialized
+        final Activity activity = this;
+        runOnUiThread(new Runnable() {
+            public void run() {
+                activity.findViewById(R.id.button_play).setEnabled(true);
+                activity.findViewById(R.id.button_stop).setEnabled(true);
+            }
+        });
+    }
+
+    // The text widget acts as an slave for the seek bar, so it reflects what the seek bar shows, whether
+    // it is an actual pipeline position or the position the user is currently dragging to.
+    private void updateTimeWidget () {
+        final TextView tv = (TextView) this.findViewById(R.id.textview_time);
+        final SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
+        final int pos = sb.getProgress();
+
+        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
+        df.setTimeZone(TimeZone.getTimeZone("UTC"));
+        final String message = df.format(new Date (pos)) + " / " + df.format(new Date (duration));
+        tv.setText(message);
+    }
+
+    // Called from native code
+    private void setCurrentPosition(final int position, final int duration) {
+        final SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
+
+        // Ignore position messages from the pipeline if the seek bar is being dragged
+        if (sb.isPressed()) return;
+
+        runOnUiThread (new Runnable() {
+          public void run() {
+            sb.setMax(duration);
+            sb.setProgress(position);
+            updateTimeWidget();
+          }
+        });
+        this.position = position;
+        this.duration = duration;
+    }
+
+    static {
+        System.loadLibrary("gstreamer_android");
+        System.loadLibrary("tutorial-4");
+        nativeClassInit();
+    }
+
+    public void surfaceChanged(SurfaceHolder holder, int format, int width,
+            int height) {
+        Log.d("GStreamer", "Surface changed to format " + format + " width "
+                + width + " height " + height);
+        nativeSurfaceInit (holder.getSurface());
+    }
+
+    public void surfaceCreated(SurfaceHolder holder) {
+        Log.d("GStreamer", "Surface created: " + holder.getSurface());
+    }
+
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        Log.d("GStreamer", "Surface destroyed");
+        nativeSurfaceFinalize ();
+    }
+
+    // Called from native code when the size of the media changes or is first detected.
+    // Inform the video surface about the new size and recalculate the layout.
+    private void onMediaSizeChanged (int width, int height) {
+        Log.i ("GStreamer", "Media size changed to " + width + "x" + height);
+        final GStreamerSurfaceView gsv = (GStreamerSurfaceView) this.findViewById(R.id.surface_video);
+        gsv.media_width = width;
+        gsv.media_height = height;
+        runOnUiThread(new Runnable() {
+            public void run() {
+                gsv.requestLayout();
+            }
+        });
+    }
+
+    // The Seek Bar thumb has moved, either because the user dragged it or we have called setProgress()
+    public void onProgressChanged(SeekBar sb, int progress, boolean fromUser) {
+        if (fromUser == false) return;
+        desired_position = progress;
+        // If this is a local file, allow scrub seeking, this is, seek as soon as the slider is moved.
+        if (is_local_media) nativeSetPosition(desired_position);
+        updateTimeWidget();
+    }
+
+    // The user started dragging the Seek Bar thumb
+    public void onStartTrackingTouch(SeekBar sb) {
+        nativePause();
+    }
+
+    // The user released the Seek Bar thumb
+    public void onStopTrackingTouch(SeekBar sb) {
+        // If this is a remote file, scrub seeking is probably not going to work smoothly enough.
+        // Therefore, perform only the seek when the slider is released.
+        if (!is_local_media) nativeSetPosition(desired_position);
+        if (is_playing_desired) nativePlay();
+    }
+}

examples/tutorials/android/android-tutorial-5/.gitignore

@@ -0,0 +1,4 @@
+.externalNativeBuild/
+assets/
+gst-build-*/
+src/org/

examples/tutorials/android/android-tutorial-5/AndroidManifest.xml

@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.freedesktop.gstreamer.tutorials.tutorial_5"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="9"
+        android:targetSdkVersion="14" />
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+
+    <uses-feature android:glEsVersion="0x00020000" />
+
+    <application
+        android:icon="@drawable/gstreamer_logo_5"
+        android:label="@string/app_name" >
+        <activity
+            android:name=".Tutorial5"
+            android:label="@string/app_name" >
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <!-- Local files whose MIME type is known to Android -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:mimeType="audio/*" />
+                <data android:mimeType="video/*" />
+                <data android:mimeType="image/*" />
+            </intent-filter>
+
+            <!-- Local files with unknown MIME type.
+                 The list of extensions and supported protocols can certainly be extended. -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="file" />
+                <data android:mimeType="*/*" />
+                <data android:pathPattern=".*\\.avi" />
+                <data android:pathPattern=".*\\.AVI" />
+                <data android:pathPattern=".*\\.mkv" />
+                <data android:pathPattern=".*\\.MKV" />
+                <data android:pathPattern=".*\\.webm" />
+                <data android:pathPattern=".*\\.WEBM" />
+                <data android:pathPattern=".*\\.ogv" />
+                <data android:pathPattern=".*\\.OGV" />
+                <data android:pathPattern=".*\\.mp4" />
+                <data android:pathPattern=".*\\.MP4" />
+                <data android:pathPattern=".*\\.mov" />
+                <data android:pathPattern=".*\\.MOV" />
+            </intent-filter>
+
+            <!-- Remote files. These typically have unknown MIME type.
+                 The list of extensions and supported protocols can certainly be extended. -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="http" />
+                <data android:pathPattern=".*\\.avi" />
+                <data android:pathPattern=".*\\.AVI" />
+                <data android:pathPattern=".*\\.mkv" />
+                <data android:pathPattern=".*\\.MKV" />
+                <data android:pathPattern=".*\\.webm" />
+                <data android:pathPattern=".*\\.WEBM" />
+                <data android:pathPattern=".*\\.ogv" />
+                <data android:pathPattern=".*\\.OGV" />
+                <data android:pathPattern=".*\\.mp4" />
+                <data android:pathPattern=".*\\.MP4" />
+                <data android:pathPattern=".*\\.mov" />
+                <data android:pathPattern=".*\\.MOV" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name="com.lamerman.FileDialog"
+            android:label="@string/filechooser_name" >
+        </activity>
+    </application>
+
+</manifest>

examples/tutorials/android/android-tutorial-5/build.gradle

@@ -0,0 +1,73 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion '27.0.3'
+
+    defaultConfig {
+        applicationId "org.freedesktop.gstreamer.tutorials.tutorial_5"
+        minSdkVersion 15
+        targetSdkVersion 15
+        versionCode 1
+        versionName "1.0"
+
+
+        externalNativeBuild {
+            ndkBuild {
+                def gstRoot
+
+                if (project.hasProperty('gstAndroidRoot'))
+                    gstRoot = project.gstAndroidRoot
+                else
+                    gstRoot = System.env.GSTREAMER_ROOT_ANDROID
+
+                if (gstRoot == null)
+                    throw new GradleException('GSTREAMER_ROOT_ANDROID must be set, or "gstAndroidRoot" must be defined in your gradle.properties in the top level directory of the unpacked universal GStreamer Android binaries')
+
+                arguments "NDK_APPLICATION_MK=jni/Application.mk", "GSTREAMER_JAVA_SRC_DIR=src", "GSTREAMER_ROOT_ANDROID=$gstRoot", "GSTREAMER_ASSETS_DIR=src/assets"
+
+                targets "tutorial-5"
+
+                // All archs except MIPS and MIPS64 are supported
+                abiFilters  'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            sourceSets {
+                main {
+                    manifest.srcFile 'AndroidManifest.xml'
+                    java.srcDirs = ['src']
+                    resources.srcDirs = ['src']
+                    aidl.srcDirs = ['src']
+                    renderscript.srcDirs = ['src']
+                    res.srcDirs = ['res']
+                    assets.srcDirs = ['assets']
+                }
+            }
+        }
+    }
+
+    externalNativeBuild {
+        ndkBuild {
+            path 'jni/Android.mk'
+        }
+    }
+}
+
+afterEvaluate {
+    if (project.hasProperty('compileDebugJavaWithJavac'))
+        project.compileDebugJavaWithJavac.dependsOn 'externalNativeBuildDebug'
+    if (project.hasProperty('compileReleaseJavaWithJavac'))
+        project.compileReleaseJavaWithJavac.dependsOn 'externalNativeBuildRelease'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support:appcompat-v7:23.1.1'
+}

examples/tutorials/android/android-tutorial-5/jni/Android.mk

@@ -0,0 +1,34 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := tutorial-5
+LOCAL_SRC_FILES := tutorial-5.c dummy.cpp
+LOCAL_SHARED_LIBRARIES := gstreamer_android
+LOCAL_LDLIBS := -llog -landroid
+include $(BUILD_SHARED_LIBRARY)
+
+ifndef GSTREAMER_ROOT_ANDROID
+$(error GSTREAMER_ROOT_ANDROID is not defined!)
+endif
+
+ifeq ($(TARGET_ARCH_ABI),armeabi)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm
+else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
+else ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm64
+else ifeq ($(TARGET_ARCH_ABI),x86)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86
+else ifeq ($(TARGET_ARCH_ABI),x86_64)
+GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86_64
+else
+$(error Target arch ABI not supported: $(TARGET_ARCH_ABI))
+endif
+
+GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build/
+include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
+GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_PLAYBACK) $(GSTREAMER_PLUGINS_CODECS) $(GSTREAMER_PLUGINS_NET) $(GSTREAMER_PLUGINS_SYS)
+G_IO_MODULES              := openssl
+GSTREAMER_EXTRA_DEPS      := gstreamer-video-1.0
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

examples/tutorials/android/android-tutorial-5/jni/Application.mk

@@ -0,0 +1,2 @@
+APP_ABI = armeabi armeabi-v7a arm64-v8a x86 x86_64
+APP_STL = c++_shared

examples/tutorials/android/android-tutorial-5/jni/tutorial-5.c

@@ -0,0 +1,683 @@
+#include <string.h>
+#include <stdint.h>
+#include <jni.h>
+#include <android/log.h>
+#include <android/native_window.h>
+#include <android/native_window_jni.h>
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <gst/video/videooverlay.h>
+#include <pthread.h>
+
+GST_DEBUG_CATEGORY_STATIC (debug_category);
+#define GST_CAT_DEFAULT debug_category
+
+/*
+ * These macros provide a way to store the native pointer to CustomData, which might be 32 or 64 bits, into
+ * a jlong, which is always 64 bits, without warnings.
+ */
+#if GLIB_SIZEOF_VOID_P == 8
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)data)
+#else
+# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(jint)(*env)->GetLongField (env, thiz, fieldID)
+# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)(jint)data)
+#endif
+
+/* Do not allow seeks to be performed closer than this distance. It is visually useless, and will probably
+ * confuse some demuxers. */
+#define SEEK_MIN_DELAY (500 * GST_MSECOND)
+
+/* Structure to contain all our information, so we can pass it to callbacks */
+typedef struct _CustomData
+{
+  jobject app;                  /* Application instance, used to call its methods. A global reference is kept. */
+  GstElement *pipeline;         /* The running pipeline */
+  GMainContext *context;        /* GLib context used to run the main loop */
+  GMainLoop *main_loop;         /* GLib main loop */
+  gboolean initialized;         /* To avoid informing the UI multiple times about the initialization */
+  ANativeWindow *native_window; /* The Android native window where video will be rendered */
+  GstState state;               /* Current pipeline state */
+  GstState target_state;        /* Desired pipeline state, to be set once buffering is complete */
+  gint64 duration;              /* Cached clip duration */
+  gint64 desired_position;      /* Position to seek to, once the pipeline is running */
+  GstClockTime last_seek_time;  /* For seeking overflow prevention (throttling) */
+  gboolean is_live;             /* Live streams do not use buffering */
+} CustomData;
+
+/* playbin2 flags */
+typedef enum
+{
+  GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
+} GstPlayFlags;
+
+/* These global variables cache values which are not changing during execution */
+static pthread_t gst_app_thread;
+static pthread_key_t current_jni_env;
+static JavaVM *java_vm;
+static jfieldID custom_data_field_id;
+static jmethodID set_message_method_id;
+static jmethodID set_current_position_method_id;
+static jmethodID on_gstreamer_initialized_method_id;
+static jmethodID on_media_size_changed_method_id;
+
+/*
+ * Private methods
+ */
+
+/* Register this thread with the VM */
+static JNIEnv *
+attach_current_thread (void)
+{
+  JNIEnv *env;
+  JavaVMAttachArgs args;
+
+  GST_DEBUG ("Attaching thread %p", g_thread_self ());
+  args.version = JNI_VERSION_1_4;
+  args.name = NULL;
+  args.group = NULL;
+
+  if ((*java_vm)->AttachCurrentThread (java_vm, &env, &args) < 0) {
+    GST_ERROR ("Failed to attach current thread");
+    return NULL;
+  }
+
+  return env;
+}
+
+/* Unregister this thread from the VM */
+static void
+detach_current_thread (void *env)
+{
+  GST_DEBUG ("Detaching thread %p", g_thread_self ());
+  (*java_vm)->DetachCurrentThread (java_vm);
+}
+
+/* Retrieve the JNI environment for this thread */
+static JNIEnv *
+get_jni_env (void)
+{
+  JNIEnv *env;
+
+  if ((env = pthread_getspecific (current_jni_env)) == NULL) {
+    env = attach_current_thread ();
+    pthread_setspecific (current_jni_env, env);
+  }
+
+  return env;
+}
+
+/* Change the content of the UI's TextView */
+static void
+set_ui_message (const gchar * message, CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  GST_DEBUG ("Setting message to: %s", message);
+  jstring jmessage = (*env)->NewStringUTF (env, message);
+  (*env)->CallVoidMethod (env, data->app, set_message_method_id, jmessage);
+  if ((*env)->ExceptionCheck (env)) {
+    GST_ERROR ("Failed to call Java method");
+    (*env)->ExceptionClear (env);
+  }
+  (*env)->DeleteLocalRef (env, jmessage);
+}
+
+/* Tell the application what is the current position and clip duration */
+static void
+set_current_ui_position (gint position, gint duration, CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  (*env)->CallVoidMethod (env, data->app, set_current_position_method_id,
+      position, duration);
+  if ((*env)->ExceptionCheck (env)) {
+    GST_ERROR ("Failed to call Java method");
+    (*env)->ExceptionClear (env);
+  }
+}
+
+/* If we have pipeline and it is running, query the current position and clip duration and inform
+ * the application */
+static gboolean
+refresh_ui (CustomData * data)
+{
+  gint64 current = -1;
+  gint64 position;
+
+  /* We do not want to update anything unless we have a working pipeline in the PAUSED or PLAYING state */
+  if (!data || !data->pipeline || data->state < GST_STATE_PAUSED)
+    return TRUE;
+
+  /* If we didn't know it yet, query the stream duration */
+  if (!GST_CLOCK_TIME_IS_VALID (data->duration)) {
+    if (!gst_element_query_duration (data->pipeline, GST_FORMAT_TIME,
+            &data->duration)) {
+      GST_WARNING
+          ("Could not query current duration (normal for still pictures)");
+      data->duration = 0;
+    }
+  }
+
+  if (!gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position)) {
+    GST_WARNING
+        ("Could not query current position (normal for still pictures)");
+    position = 0;
+  }
+
+  /* Java expects these values in milliseconds, and GStreamer provides nanoseconds */
+  set_current_ui_position (position / GST_MSECOND, data->duration / GST_MSECOND,
+      data);
+  return TRUE;
+}
+
+/* Forward declaration for the delayed seek callback */
+static gboolean delayed_seek_cb (CustomData * data);
+
+/* Perform seek, if we are not too close to the previous seek. Otherwise, schedule the seek for
+ * some time in the future. */
+static void
+execute_seek (gint64 desired_position, CustomData * data)
+{
+  gint64 diff;
+
+  if (desired_position == GST_CLOCK_TIME_NONE)
+    return;
+
+  diff = gst_util_get_timestamp () - data->last_seek_time;
+
+  if (GST_CLOCK_TIME_IS_VALID (data->last_seek_time) && diff < SEEK_MIN_DELAY) {
+    /* The previous seek was too close, delay this one */
+    GSource *timeout_source;
+
+    if (data->desired_position == GST_CLOCK_TIME_NONE) {
+      /* There was no previous seek scheduled. Setup a timer for some time in the future */
+      timeout_source =
+          g_timeout_source_new ((SEEK_MIN_DELAY - diff) / GST_MSECOND);
+      g_source_set_callback (timeout_source, (GSourceFunc) delayed_seek_cb,
+          data, NULL);
+      g_source_attach (timeout_source, data->context);
+      g_source_unref (timeout_source);
+    }
+    /* Update the desired seek position. If multiple petitions are received before it is time
+     * to perform a seek, only the last one is remembered. */
+    data->desired_position = desired_position;
+    GST_DEBUG ("Throttling seek to %" GST_TIME_FORMAT ", will be in %"
+        GST_TIME_FORMAT, GST_TIME_ARGS (desired_position),
+        GST_TIME_ARGS (SEEK_MIN_DELAY - diff));
+  } else {
+    /* Perform the seek now */
+    GST_DEBUG ("Seeking to %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (desired_position));
+    data->last_seek_time = gst_util_get_timestamp ();
+    gst_element_seek_simple (data->pipeline, GST_FORMAT_TIME,
+        GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, desired_position);
+    data->desired_position = GST_CLOCK_TIME_NONE;
+  }
+}
+
+/* Delayed seek callback. This gets called by the timer setup in the above function. */
+static gboolean
+delayed_seek_cb (CustomData * data)
+{
+  GST_DEBUG ("Doing delayed seek to %" GST_TIME_FORMAT,
+      GST_TIME_ARGS (data->desired_position));
+  execute_seek (data->desired_position, data);
+  return FALSE;
+}
+
+/* Retrieve errors from the bus and show them on the UI */
+static void
+error_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GError *err;
+  gchar *debug_info;
+  gchar *message_string;
+
+  gst_message_parse_error (msg, &err, &debug_info);
+  message_string =
+      g_strdup_printf ("Error received from element %s: %s",
+      GST_OBJECT_NAME (msg->src), err->message);
+  g_clear_error (&err);
+  g_free (debug_info);
+  set_ui_message (message_string, data);
+  g_free (message_string);
+  data->target_state = GST_STATE_NULL;
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+}
+
+/* Called when the End Of the Stream is reached. Just move to the beginning of the media and pause. */
+static void
+eos_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  data->target_state = GST_STATE_PAUSED;
+  data->is_live |=
+      (gst_element_set_state (data->pipeline,
+          GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
+  execute_seek (0, data);
+}
+
+/* Called when the duration of the media changes. Just mark it as unknown, so we re-query it in the next UI refresh. */
+static void
+duration_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  data->duration = GST_CLOCK_TIME_NONE;
+}
+
+/* Called when buffering messages are received. We inform the UI about the current buffering level and
+ * keep the pipeline paused until 100% buffering is reached. At that point, set the desired state. */
+static void
+buffering_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  gint percent;
+
+  if (data->is_live)
+    return;
+
+  gst_message_parse_buffering (msg, &percent);
+  if (percent < 100 && data->target_state >= GST_STATE_PAUSED) {
+    gchar *message_string = g_strdup_printf ("Buffering %d%%", percent);
+    gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+    set_ui_message (message_string, data);
+    g_free (message_string);
+  } else if (data->target_state >= GST_STATE_PLAYING) {
+    gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+  } else if (data->target_state >= GST_STATE_PAUSED) {
+    set_ui_message ("Buffering complete", data);
+  }
+}
+
+/* Called when the clock is lost */
+static void
+clock_lost_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  if (data->target_state >= GST_STATE_PLAYING) {
+    gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+    gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+  }
+}
+
+/* Retrieve the video sink's Caps and tell the application about the media size */
+static void
+check_media_size (CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  GstElement *video_sink;
+  GstPad *video_sink_pad;
+  GstCaps *caps;
+  GstVideoInfo info;
+
+  /* Retrieve the Caps at the entrance of the video sink */
+  g_object_get (data->pipeline, "video-sink", &video_sink, NULL);
+  video_sink_pad = gst_element_get_static_pad (video_sink, "sink");
+  caps = gst_pad_get_current_caps (video_sink_pad);
+
+  if (gst_video_info_from_caps (&info, caps)) {
+    info.width = info.width * info.par_n / info.par_d;
+    GST_DEBUG ("Media size is %dx%d, notifying application", info.width,
+        info.height);
+
+    (*env)->CallVoidMethod (env, data->app, on_media_size_changed_method_id,
+        (jint) info.width, (jint) info.height);
+    if ((*env)->ExceptionCheck (env)) {
+      GST_ERROR ("Failed to call Java method");
+      (*env)->ExceptionClear (env);
+    }
+  }
+
+  gst_caps_unref (caps);
+  gst_object_unref (video_sink_pad);
+  gst_object_unref (video_sink);
+}
+
+/* Notify UI about pipeline state changes */
+static void
+state_changed_cb (GstBus * bus, GstMessage * msg, CustomData * data)
+{
+  GstState old_state, new_state, pending_state;
+  gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
+  /* Only pay attention to messages coming from the pipeline, not its children */
+  if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->pipeline)) {
+    data->state = new_state;
+    gchar *message = g_strdup_printf ("State changed to %s",
+        gst_element_state_get_name (new_state));
+    set_ui_message (message, data);
+    g_free (message);
+
+    if (new_state == GST_STATE_NULL || new_state == GST_STATE_READY)
+      data->is_live = FALSE;
+
+    /* The Ready to Paused state change is particularly interesting: */
+    if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED) {
+      /* By now the sink already knows the media size */
+      check_media_size (data);
+
+      /* If there was a scheduled seek, perform it now that we have moved to the Paused state */
+      if (GST_CLOCK_TIME_IS_VALID (data->desired_position))
+        execute_seek (data->desired_position, data);
+    }
+  }
+}
+
+/* Check if all conditions are met to report GStreamer as initialized.
+ * These conditions will change depending on the application */
+static void
+check_initialization_complete (CustomData * data)
+{
+  JNIEnv *env = get_jni_env ();
+  if (!data->initialized && data->native_window && data->main_loop) {
+    GST_DEBUG
+        ("Initialization complete, notifying application. native_window:%p main_loop:%p",
+        data->native_window, data->main_loop);
+
+    /* The main loop is running and we received a native window, inform the sink about it */
+    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->pipeline),
+        (guintptr) data->native_window);
+
+    (*env)->CallVoidMethod (env, data->app, on_gstreamer_initialized_method_id);
+    if ((*env)->ExceptionCheck (env)) {
+      GST_ERROR ("Failed to call Java method");
+      (*env)->ExceptionClear (env);
+    }
+    data->initialized = TRUE;
+  }
+}
+
+/* Main method for the native code. This is executed on its own thread. */
+static void *
+app_function (void *userdata)
+{
+  JavaVMAttachArgs args;
+  GstBus *bus;
+  CustomData *data = (CustomData *) userdata;
+  GSource *timeout_source;
+  GSource *bus_source;
+  GError *error = NULL;
+  guint flags;
+
+  GST_DEBUG ("Creating pipeline in CustomData at %p", data);
+
+  /* Create our own GLib Main Context and make it the default one */
+  data->context = g_main_context_new ();
+  g_main_context_push_thread_default (data->context);
+
+  /* Build pipeline */
+  data->pipeline = gst_parse_launch ("playbin", &error);
+  if (error) {
+    gchar *message =
+        g_strdup_printf ("Unable to build pipeline: %s", error->message);
+    g_clear_error (&error);
+    set_ui_message (message, data);
+    g_free (message);
+    return NULL;
+  }
+
+  /* Disable subtitles */
+  g_object_get (data->pipeline, "flags", &flags, NULL);
+  flags &= ~GST_PLAY_FLAG_TEXT;
+  g_object_set (data->pipeline, "flags", flags, NULL);
+
+  /* Set the pipeline to READY, so it can already accept a window handle, if we have one */
+  data->target_state = GST_STATE_READY;
+  gst_element_set_state (data->pipeline, GST_STATE_READY);
+
+  /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
+  bus = gst_element_get_bus (data->pipeline);
+  bus_source = gst_bus_create_watch (bus);
+  g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func,
+      NULL, NULL);
+  g_source_attach (bus_source, data->context);
+  g_source_unref (bus_source);
+  g_signal_connect (G_OBJECT (bus), "message::error", (GCallback) error_cb,
+      data);
+  g_signal_connect (G_OBJECT (bus), "message::eos", (GCallback) eos_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::state-changed",
+      (GCallback) state_changed_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::duration",
+      (GCallback) duration_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::buffering",
+      (GCallback) buffering_cb, data);
+  g_signal_connect (G_OBJECT (bus), "message::clock-lost",
+      (GCallback) clock_lost_cb, data);
+  gst_object_unref (bus);
+
+  /* Register a function that GLib will call 4 times per second */
+  timeout_source = g_timeout_source_new (250);
+  g_source_set_callback (timeout_source, (GSourceFunc) refresh_ui, data, NULL);
+  g_source_attach (timeout_source, data->context);
+  g_source_unref (timeout_source);
+
+  /* Create a GLib Main Loop and set it to run */
+  GST_DEBUG ("Entering main loop... (CustomData:%p)", data);
+  data->main_loop = g_main_loop_new (data->context, FALSE);
+  check_initialization_complete (data);
+  g_main_loop_run (data->main_loop);
+  GST_DEBUG ("Exited main loop");
+  g_main_loop_unref (data->main_loop);
+  data->main_loop = NULL;
+
+  /* Free resources */
+  g_main_context_pop_thread_default (data->context);
+  g_main_context_unref (data->context);
+  data->target_state = GST_STATE_NULL;
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+  gst_object_unref (data->pipeline);
+
+  return NULL;
+}
+
+/*
+ * Java Bindings
+ */
+
+/* Instruct the native code to create its internal data structure, pipeline and thread */
+static void
+gst_native_init (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = g_new0 (CustomData, 1);
+  data->desired_position = GST_CLOCK_TIME_NONE;
+  data->last_seek_time = GST_CLOCK_TIME_NONE;
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
+  GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-5", 0,
+      "Android tutorial 5");
+  gst_debug_set_threshold_for_name ("tutorial-5", GST_LEVEL_DEBUG);
+  GST_DEBUG ("Created CustomData at %p", data);
+  data->app = (*env)->NewGlobalRef (env, thiz);
+  GST_DEBUG ("Created GlobalRef for app object at %p", data->app);
+  pthread_create (&gst_app_thread, NULL, &app_function, data);
+}
+
+/* Quit the main loop, remove the native thread and free resources */
+static void
+gst_native_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Quitting main loop...");
+  g_main_loop_quit (data->main_loop);
+  GST_DEBUG ("Waiting for thread to finish...");
+  pthread_join (gst_app_thread, NULL);
+  GST_DEBUG ("Deleting GlobalRef for app object at %p", data->app);
+  (*env)->DeleteGlobalRef (env, data->app);
+  GST_DEBUG ("Freeing CustomData at %p", data);
+  g_free (data);
+  SET_CUSTOM_DATA (env, thiz, custom_data_field_id, NULL);
+  GST_DEBUG ("Done finalizing");
+}
+
+/* Set playbin2's URI */
+void
+gst_native_set_uri (JNIEnv * env, jobject thiz, jstring uri)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data || !data->pipeline)
+    return;
+  const gchar *char_uri = (*env)->GetStringUTFChars (env, uri, NULL);
+  GST_DEBUG ("Setting URI to %s", char_uri);
+  if (data->target_state >= GST_STATE_READY)
+    gst_element_set_state (data->pipeline, GST_STATE_READY);
+  g_object_set (data->pipeline, "uri", char_uri, NULL);
+  (*env)->ReleaseStringUTFChars (env, uri, char_uri);
+  data->duration = GST_CLOCK_TIME_NONE;
+  data->is_live |=
+      (gst_element_set_state (data->pipeline,
+          data->target_state) == GST_STATE_CHANGE_NO_PREROLL);
+}
+
+/* Set pipeline to PLAYING state */
+static void
+gst_native_play (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PLAYING");
+  data->target_state = GST_STATE_PLAYING;
+  data->is_live |=
+      (gst_element_set_state (data->pipeline,
+          GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
+}
+
+/* Set pipeline to PAUSED state */
+static void
+gst_native_pause (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Setting state to PAUSED");
+  data->target_state = GST_STATE_PAUSED;
+  data->is_live |=
+      (gst_element_set_state (data->pipeline,
+          GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
+}
+
+/* Instruct the pipeline to seek to a different position */
+void
+gst_native_set_position (JNIEnv * env, jobject thiz, int milliseconds)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  gint64 desired_position = (gint64) (milliseconds * GST_MSECOND);
+  if (data->state >= GST_STATE_PAUSED) {
+    execute_seek (desired_position, data);
+  } else {
+    GST_DEBUG ("Scheduling seek to %" GST_TIME_FORMAT " for later",
+        GST_TIME_ARGS (desired_position));
+    data->desired_position = desired_position;
+  }
+}
+
+/* Static class initializer: retrieve method and field IDs */
+static jboolean
+gst_native_class_init (JNIEnv * env, jclass klass)
+{
+  custom_data_field_id =
+      (*env)->GetFieldID (env, klass, "native_custom_data", "J");
+  set_message_method_id =
+      (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
+  set_current_position_method_id =
+      (*env)->GetMethodID (env, klass, "setCurrentPosition", "(II)V");
+  on_gstreamer_initialized_method_id =
+      (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
+  on_media_size_changed_method_id =
+      (*env)->GetMethodID (env, klass, "onMediaSizeChanged", "(II)V");
+
+  if (!custom_data_field_id || !set_message_method_id
+      || !on_gstreamer_initialized_method_id || !on_media_size_changed_method_id
+      || !set_current_position_method_id) {
+    /* We emit this message through the Android log instead of the GStreamer log because the later
+     * has not been initialized yet.
+     */
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-4",
+        "The calling class does not implement all necessary interface methods");
+    return JNI_FALSE;
+  }
+  return JNI_TRUE;
+}
+
+static void
+gst_native_surface_init (JNIEnv * env, jobject thiz, jobject surface)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  ANativeWindow *new_native_window = ANativeWindow_fromSurface (env, surface);
+  GST_DEBUG ("Received surface %p (native window %p)", surface,
+      new_native_window);
+
+  if (data->native_window) {
+    ANativeWindow_release (data->native_window);
+    if (data->native_window == new_native_window) {
+      GST_DEBUG ("New native window is the same as the previous one %p",
+          data->native_window);
+      if (data->pipeline) {
+        gst_video_overlay_expose (GST_VIDEO_OVERLAY (data->pipeline));
+        gst_video_overlay_expose (GST_VIDEO_OVERLAY (data->pipeline));
+      }
+      return;
+    } else {
+      GST_DEBUG ("Released previous native window %p", data->native_window);
+      data->initialized = FALSE;
+    }
+  }
+  data->native_window = new_native_window;
+
+  check_initialization_complete (data);
+}
+
+static void
+gst_native_surface_finalize (JNIEnv * env, jobject thiz)
+{
+  CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
+  if (!data)
+    return;
+  GST_DEBUG ("Releasing Native Window %p", data->native_window);
+
+  if (data->pipeline) {
+    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->pipeline),
+        (guintptr) NULL);
+    gst_element_set_state (data->pipeline, GST_STATE_READY);
+  }
+
+  ANativeWindow_release (data->native_window);
+  data->native_window = NULL;
+  data->initialized = FALSE;
+}
+
+/* List of implemented native methods */
+static JNINativeMethod native_methods[] = {
+  {"nativeInit", "()V", (void *) gst_native_init},
+  {"nativeFinalize", "()V", (void *) gst_native_finalize},
+  {"nativeSetUri", "(Ljava/lang/String;)V", (void *) gst_native_set_uri},
+  {"nativePlay", "()V", (void *) gst_native_play},
+  {"nativePause", "()V", (void *) gst_native_pause},
+  {"nativeSetPosition", "(I)V", (void *) gst_native_set_position},
+  {"nativeSurfaceInit", "(Ljava/lang/Object;)V",
+      (void *) gst_native_surface_init},
+  {"nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize},
+  {"nativeClassInit", "()Z", (void *) gst_native_class_init}
+};
+
+/* Library initializer */
+jint
+JNI_OnLoad (JavaVM * vm, void *reserved)
+{
+  JNIEnv *env = NULL;
+
+  java_vm = vm;
+
+  if ((*vm)->GetEnv (vm, (void **) &env, JNI_VERSION_1_4) != JNI_OK) {
+    __android_log_print (ANDROID_LOG_ERROR, "tutorial-5",
+        "Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env,
+      "org/freedesktop/gstreamer/tutorials/tutorial_5/Tutorial5");
+  (*env)->RegisterNatives (env, klass, native_methods,
+      G_N_ELEMENTS (native_methods));
+
+  pthread_key_create (&current_jni_env, detach_current_thread);
+
+  return JNI_VERSION_1_4;
+}

examples/tutorials/android/android-tutorial-5/res/layout/file_dialog_main.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:layout_above="@+id/fdLinearLayoutList"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/path"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content" />
+
+    <ListView
+        android:id="@android:id/list"
+        android:layout_width="fill_parent"
+        android:layout_height="0dip"
+        android:layout_weight="1" />
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal" >
+
+        <Button
+            android:id="@+id/fdButtonCancel"
+            android:layout_width="0dip"
+            android:layout_height="wrap_content"
+            android:layout_weight=".3"
+            android:text="@string/button_cancel" />
+
+        <Button
+            android:id="@+id/fdButtonSelect"
+            android:layout_width="0dip"
+            android:layout_height="wrap_content"
+            android:layout_weight=".7"
+            android:text="@string/button_select" />
+    </LinearLayout>
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-5/res/layout/file_dialog_row.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="wrap_content" >
+
+    <ImageView
+        android:id="@+id/fdrowimage"
+        android:layout_width="wrap_content"
+        android:layout_height="36dp"
+        android:contentDescription="@string/icon" />
+
+    <TextView
+        android:id="@+id/fdrowtext"
+        android:layout_width="0dip"
+        android:layout_height="36dp"
+        android:layout_weight="1"
+        android:ellipsize="marquee"
+        android:gravity="center_vertical"
+        android:marqueeRepeatLimit="marquee_forever"
+        android:scrollHorizontally="true"
+        android:singleLine="true"
+        android:textSize="23dp" />
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-5/res/layout/main.xml

@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center_vertical"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/textview_message"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal"
+        android:orientation="horizontal" >
+
+        <ImageButton
+            android:id="@+id/button_play"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_play"
+            android:src="@android:drawable/ic_media_play"
+            android:text="@string/button_play" />
+
+        <ImageButton
+            android:id="@+id/button_stop"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_stop"
+            android:src="@android:drawable/ic_media_pause"
+            android:text="@string/button_stop" />
+
+        <ImageButton
+            android:id="@+id/button_select"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/button_select"
+            android:src="@android:drawable/ic_media_next"
+            android:text="@string/button_select" />
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dip"
+        android:gravity="center_horizontal"
+        android:orientation="horizontal" >
+
+        <TextView
+            android:id="@+id/textview_time"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginLeft="5dip"
+            android:layout_marginRight="5dip" />
+
+        <SeekBar
+            android:id="@+id/seek_bar"
+            android:layout_width="0dip"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_weight="1"
+            android:indeterminate="false" />
+    </LinearLayout>
+
+    <org.freedesktop.gstreamer.tutorials.tutorial_5.GStreamerSurfaceView
+        android:id="@+id/surface_video"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical|center_horizontal" />
+
+</LinearLayout>

examples/tutorials/android/android-tutorial-5/res/values/strings.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">GStreamer tutorial 5</string>
+    <string name="button_play">Play</string>
+    <string name="button_stop">Stop</string>
+    <string name="button_select">Select</string>
+    <string name="button_cancel">Cancel</string>
+    <string name="filechooser_name">Select a file</string>
+    <string name="location">Location</string>
+    <string name="cant_read_folder">folder cannot be read</string>
+    <string name="icon">Icon</string>
+</resources>

examples/tutorials/android/android-tutorial-5/src/com/lamerman/FileDialog.java

@@ -0,0 +1,334 @@
+// Based on http://code.google.com/p/android-file-dialog/
+//
+// Copyright (c) 2011, 2012, Alexander Ponomarev <alexander.ponomarev.1@gmail.com>
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+// Redistributions of source code must retain the above copyright notice, this list
+// of conditions and the following disclaimer. Redistributions in binary form must
+// reproduce the above copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided with the distribution.
+// Neither the name of the <ORGANIZATION> nor the names of its contributors may be used
+// to endorse or promote products derived from this software without specific prior
+// written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+// SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+// DAMAGE.
+
+package com.lamerman;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.TreeMap;
+
+import android.app.AlertDialog;
+import android.app.ListActivity;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.ListView;
+import android.widget.SimpleAdapter;
+import android.widget.TextView;
+
+import org.freedesktop.gstreamer.tutorials.tutorial_5.R;
+
+/**
+ * Activity para escolha de arquivos/diretorios.
+ *
+ * @author android
+ *
+ */
+public class FileDialog extends ListActivity {
+
+    /**
+     * Chave de um item da lista de paths.
+     */
+    private static final String ITEM_KEY = "key";
+
+    /**
+     * Imagem de um item da lista de paths (diretorio ou arquivo).
+     */
+    private static final String ITEM_IMAGE = "image";
+
+    /**
+     * Diretorio raiz.
+     */
+    private static final String ROOT = "/";
+
+    /**
+     * Parametro de entrada da Activity: path inicial. Padrao: ROOT.
+     */
+    public static final String START_PATH = "START_PATH";
+
+    /**
+     * Parametro de entrada da Activity: filtro de formatos de arquivos. Padrao:
+     * null.
+     */
+    public static final String FORMAT_FILTER = "FORMAT_FILTER";
+
+    /**
+     * Parametro de saida da Activity: path escolhido. Padrao: null.
+     */
+    public static final String RESULT_PATH = "RESULT_PATH";
+
+    private List<String> path = null;
+    private TextView myPath;
+    private ArrayList<HashMap<String, Object>> mList;
+
+    private Button selectButton;
+
+    private String parentPath;
+    private String currentPath = ROOT;
+
+    private String[] formatFilter = null;
+
+    private File selectedFile;
+    private HashMap<String, Integer> lastPositions = new HashMap<String, Integer>();
+
+    /**
+     * Called when the activity is first created. Configura todos os parametros
+     * de entrada e das VIEWS..
+     */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setResult(RESULT_CANCELED, getIntent());
+
+        setContentView(R.layout.file_dialog_main);
+        myPath = (TextView) findViewById(R.id.path);
+
+        selectButton = (Button) findViewById(R.id.fdButtonSelect);
+        selectButton.setEnabled(false);
+        selectButton.setOnClickListener(new OnClickListener() {
+
+            public void onClick(View v) {
+                if (selectedFile != null) {
+                    getIntent().putExtra(RESULT_PATH, selectedFile.getPath());
+                    setResult(RESULT_OK, getIntent());
+                    finish();
+                }
+            }
+        });
+
+        formatFilter = getIntent().getStringArrayExtra(FORMAT_FILTER);
+
+        final Button cancelButton = (Button) findViewById(R.id.fdButtonCancel);
+        cancelButton.setOnClickListener(new OnClickListener() {
+
+            public void onClick(View v) {
+                setResult(RESULT_CANCELED);
+                finish();
+            }
+
+        });
+
+        String startPath;
+        if (savedInstanceState != null) {
+            startPath = savedInstanceState.getString("currentPath");
+        } else {
+            startPath = getIntent().getStringExtra(START_PATH);
+        }
+        startPath = startPath != null ? startPath : ROOT;
+        getDir(startPath);
+
+        ListView lv = (ListView) findViewById(android.R.id.list);
+        lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
+    }
+
+    private void getDir(String dirPath) {
+
+        boolean useAutoSelection = dirPath.length() < currentPath.length();
+
+        Integer position = lastPositions.get(parentPath);
+
+        getDirImpl(dirPath);
+
+        if (position != null && useAutoSelection) {
+            getListView().setSelection(position);
+        }
+
+    }
+
+    /**
+     * Monta a estrutura de arquivos e diretorios filhos do diretorio fornecido.
+     *
+     * @param dirPath
+     *            Diretorio pai.
+     */
+    private void getDirImpl(final String dirPath) {
+
+        currentPath = dirPath;
+
+        final List<String> item = new ArrayList<String>();
+        path = new ArrayList<String>();
+        mList = new ArrayList<HashMap<String, Object>>();
+
+        File f = new File(currentPath);
+        File[] files = f.listFiles();
+        if (files == null) {
+            currentPath = ROOT;
+            f = new File(currentPath);
+            files = f.listFiles();
+        }
+        myPath.setText(getText(R.string.location) + ": " + currentPath);
+
+        if (!currentPath.equals(ROOT)) {
+
+            item.add(ROOT);
+            addItem(ROOT, R.drawable.folder);
+            path.add(ROOT);
+
+            item.add("../");
+            addItem("../", R.drawable.folder);
+            path.add(f.getParent());
+            parentPath = f.getParent();
+
+        }
+
+        TreeMap<String, String> dirsMap = new TreeMap<String, String>();
+        TreeMap<String, String> dirsPathMap = new TreeMap<String, String>();
+        TreeMap<String, String> filesMap = new TreeMap<String, String>();
+        TreeMap<String, String> filesPathMap = new TreeMap<String, String>();
+        for (File file : files) {
+            if (file.isDirectory()) {
+                String dirName = file.getName();
+                dirsMap.put(dirName, dirName);
+                dirsPathMap.put(dirName, file.getPath());
+            } else {
+                final String fileName = file.getName();
+                final String fileNameLwr = fileName.toLowerCase();
+                // se ha um filtro de formatos, utiliza-o
+                if (formatFilter != null) {
+                    boolean contains = false;
+                    for (int i = 0; i < formatFilter.length; i++) {
+                        final String formatLwr = formatFilter[i].toLowerCase();
+                        if (fileNameLwr.endsWith(formatLwr)) {
+                            contains = true;
+                            break;
+                        }
+                    }
+                    if (contains) {
+                        filesMap.put(fileName, fileName);
+                        filesPathMap.put(fileName, file.getPath());
+                    }
+                    // senao, adiciona todos os arquivos
+                } else {
+                    filesMap.put(fileName, fileName);
+                    filesPathMap.put(fileName, file.getPath());
+                }
+            }
+        }
+        item.addAll(dirsMap.tailMap("").values());
+        item.addAll(filesMap.tailMap("").values());
+        path.addAll(dirsPathMap.tailMap("").values());
+        path.addAll(filesPathMap.tailMap("").values());
+
+        SimpleAdapter fileList = new SimpleAdapter(this, mList,
+                R.layout.file_dialog_row,
+                new String[] { ITEM_KEY, ITEM_IMAGE }, new int[] {
+                        R.id.fdrowtext, R.id.fdrowimage });
+
+        for (String dir : dirsMap.tailMap("").values()) {
+            addItem(dir, R.drawable.folder);
+        }
+
+        for (String file : filesMap.tailMap("").values()) {
+            addItem(file, R.drawable.file);
+        }
+
+        fileList.notifyDataSetChanged();
+
+        setListAdapter(fileList);
+
+    }
+
+    private void addItem(String fileName, int imageId) {
+        HashMap<String, Object> item = new HashMap<String, Object>();
+        item.put(ITEM_KEY, fileName);
+        item.put(ITEM_IMAGE, imageId);
+        mList.add(item);
+    }
+
+    /**
+     * Quando clica no item da lista, deve-se: 1) Se for diretorio, abre seus
+     * arquivos filhos; 2) Se puder escolher diretorio, define-o como sendo o
+     * path escolhido. 3) Se for arquivo, define-o como path escolhido. 4) Ativa
+     * botao de selecao.
+     */
+    @Override
+    protected void onListItemClick(ListView l, View v, int position, long id) {
+
+        File file = new File(path.get(position));
+
+        if (file.isDirectory()) {
+            selectButton.setEnabled(false);
+            if (file.canRead()) {
+                lastPositions.put(currentPath, position);
+                getDir(path.get(position));
+            } else {
+                new AlertDialog.Builder(this)
+                        .setIcon(android.R.drawable.stat_sys_warning)
+                        .setTitle(
+                                "[" + file.getName() + "] "
+                                        + getText(R.string.cant_read_folder))
+                        .setPositiveButton("OK",
+                                new DialogInterface.OnClickListener() {
+
+                                    public void onClick(DialogInterface dialog,
+                                            int which) {
+
+                                    }
+                                }).show();
+            }
+        } else {
+            if (selectedFile != null
+                    && selectedFile.getPath().equals(file.getPath())) {
+                getIntent().putExtra(RESULT_PATH, selectedFile.getPath());
+                setResult(RESULT_OK, getIntent());
+                finish();
+            }
+            selectedFile = file;
+            l.setItemChecked(position, true);
+            selectButton.setEnabled(true);
+        }
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if ((keyCode == KeyEvent.KEYCODE_BACK)) {
+            selectButton.setEnabled(false);
+
+            if (!currentPath.equals(ROOT)) {
+                getDir(parentPath);
+            } else {
+                return super.onKeyDown(keyCode, event);
+            }
+
+            return true;
+        } else {
+            return super.onKeyDown(keyCode, event);
+        }
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        outState.putString("currentPath", currentPath);
+        super.onSaveInstanceState(outState);
+    }
+
+}

examples/tutorials/android/android-tutorial-5/src/org/freedesktop/gstreamer/tutorials/tutorial_5/GStreamerSurfaceView.java

@@ -0,0 +1,85 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_5;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.SurfaceView;
+import android.view.View;
+
+// A simple SurfaceView whose width and height can be set from the outside
+public class GStreamerSurfaceView extends SurfaceView {
+    public int media_width = 320;
+    public int media_height = 240;
+
+    // Mandatory constructors, they do not do much
+    public GStreamerSurfaceView(Context context, AttributeSet attrs,
+            int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public GStreamerSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public GStreamerSurfaceView (Context context) {
+        super(context);
+    }
+
+    // Called by the layout manager to find out our size and give us some rules.
+    // We will try to maximize our size, and preserve the media's aspect ratio if
+    // we are given the freedom to do so.
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int width = 0, height = 0;
+        int wmode = View.MeasureSpec.getMode(widthMeasureSpec);
+        int hmode = View.MeasureSpec.getMode(heightMeasureSpec);
+        int wsize = View.MeasureSpec.getSize(widthMeasureSpec);
+        int hsize = View.MeasureSpec.getSize(heightMeasureSpec);
+
+        Log.i ("GStreamer", "onMeasure called with " + media_width + "x" + media_height);
+        // Obey width rules
+        switch (wmode) {
+        case View.MeasureSpec.AT_MOST:
+            if (hmode == View.MeasureSpec.EXACTLY) {
+                width = Math.min(hsize * media_width / media_height, wsize);
+                break;
+            }
+        case View.MeasureSpec.EXACTLY:
+            width = wsize;
+            break;
+        case View.MeasureSpec.UNSPECIFIED:
+            width = media_width;
+        }
+
+        // Obey height rules
+        switch (hmode) {
+        case View.MeasureSpec.AT_MOST:
+            if (wmode == View.MeasureSpec.EXACTLY) {
+                height = Math.min(wsize * media_height / media_width, hsize);
+                break;
+            }
+        case View.MeasureSpec.EXACTLY:
+            height = hsize;
+            break;
+        case View.MeasureSpec.UNSPECIFIED:
+            height = media_height;
+        }
+
+        // Finally, calculate best size when both axis are free
+        if (hmode == View.MeasureSpec.AT_MOST && wmode == View.MeasureSpec.AT_MOST) {
+            int correct_height = width * media_height / media_width;
+            int correct_width = height * media_width / media_height;
+
+            if (correct_height < height)
+                height = correct_height;
+            else
+                width = correct_width;
+        }
+
+        // Obey minimum size
+        width = Math.max (getSuggestedMinimumWidth(), width);
+        height = Math.max (getSuggestedMinimumHeight(), height);
+        setMeasuredDimension(width, height);
+    }
+
+}

examples/tutorials/android/android-tutorial-5/src/org/freedesktop/gstreamer/tutorials/tutorial_5/Tutorial5.java

@@ -0,0 +1,309 @@
+package org.freedesktop.gstreamer.tutorials.tutorial_5;
+
+import java.io.File;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.TimeZone;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Environment;
+import android.os.PowerManager;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.SeekBar;
+import android.widget.SeekBar.OnSeekBarChangeListener;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.freedesktop.gstreamer.GStreamer;
+import com.lamerman.FileDialog;
+
+public class Tutorial5 extends Activity implements SurfaceHolder.Callback, OnSeekBarChangeListener {
+    private native void nativeInit();     // Initialize native code, build pipeline, etc
+    private native void nativeFinalize(); // Destroy pipeline and shutdown native code
+    private native void nativeSetUri(String uri); // Set the URI of the media to play
+    private native void nativePlay();     // Set pipeline to PLAYING
+    private native void nativeSetPosition(int milliseconds); // Seek to the indicated position, in milliseconds
+    private native void nativePause();    // Set pipeline to PAUSED
+    private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
+    private native void nativeSurfaceInit(Object surface); // A new surface is available
+    private native void nativeSurfaceFinalize(); // Surface about to be destroyed
+    private long native_custom_data;      // Native code will use this to keep private data
+
+    private boolean is_playing_desired;   // Whether the user asked to go to PLAYING
+    private int position;                 // Current position, reported by native code
+    private int duration;                 // Current clip duration, reported by native code
+    private boolean is_local_media;       // Whether this clip is stored locally or is being streamed
+    private int desired_position;         // Position where the users wants to seek to
+    private String mediaUri;              // URI of the clip being played
+
+    private final String defaultMediaUri = "https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.ogv";
+
+    static private final int PICK_FILE_CODE = 1;
+    private String last_folder;
+
+    private PowerManager.WakeLock wake_lock;
+
+    // Called when the activity is first created.
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        // Initialize GStreamer and warn if it fails
+        try {
+            GStreamer.init(this);
+        } catch (Exception e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
+            return;
+        }
+
+        setContentView(R.layout.main);
+
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        wake_lock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "GStreamer tutorial 5");
+        wake_lock.setReferenceCounted(false);
+
+        ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
+        play.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = true;
+                wake_lock.acquire();
+                nativePlay();
+            }
+        });
+
+        ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
+        pause.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                is_playing_desired = false;
+                wake_lock.release();
+                nativePause();
+            }
+        });
+
+        ImageButton select = (ImageButton) this.findViewById(R.id.button_select);
+        select.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                Intent i = new Intent(getBaseContext(), FileDialog.class);
+                i.putExtra(FileDialog.START_PATH, last_folder);
+                startActivityForResult(i, PICK_FILE_CODE);
+            }
+        });
+
+        SurfaceView sv = (SurfaceView) this.findViewById(R.id.surface_video);
+        SurfaceHolder sh = sv.getHolder();
+        sh.addCallback(this);
+
+        SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
+        sb.setOnSeekBarChangeListener(this);
+
+        // Retrieve our previous state, or initialize it to default values
+        if (savedInstanceState != null) {
+            is_playing_desired = savedInstanceState.getBoolean("playing");
+            position = savedInstanceState.getInt("position");
+            duration = savedInstanceState.getInt("duration");
+            mediaUri = savedInstanceState.getString("mediaUri");
+            last_folder = savedInstanceState.getString("last_folder");
+            Log.i ("GStreamer", "Activity created with saved state:");
+        } else {
+            is_playing_desired = false;
+            position = duration = 0;
+            last_folder = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getAbsolutePath();
+            Intent intent = getIntent();
+            android.net.Uri uri = intent.getData();
+            if (uri == null)
+                mediaUri = defaultMediaUri;
+            else {
+                Log.i ("GStreamer", "Received URI: " + uri);
+                if (uri.getScheme().equals("content")) {
+                    android.database.Cursor cursor = getContentResolver().query(uri, null, null, null, null);
+                    cursor.moveToFirst();
+                    mediaUri = "file://" + cursor.getString(cursor.getColumnIndex(android.provider.MediaStore.Video.Media.DATA));
+                    cursor.close();
+                } else
+                    mediaUri = uri.toString();
+            }
+            Log.i ("GStreamer", "Activity created with no saved state:");
+        }
+        is_local_media = false;
+        Log.i ("GStreamer", "  playing:" + is_playing_desired + " position:" + position +
+                " duration: " + duration + " uri: " + mediaUri);
+
+        // Start with disabled buttons, until native code is initialized
+        this.findViewById(R.id.button_play).setEnabled(false);
+        this.findViewById(R.id.button_stop).setEnabled(false);
+
+        nativeInit();
+    }
+
+    protected void onSaveInstanceState (Bundle outState) {
+        Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired + " position:" + position +
+                " duration: " + duration + " uri: " + mediaUri);
+        outState.putBoolean("playing", is_playing_desired);
+        outState.putInt("position", position);
+        outState.putInt("duration", duration);
+        outState.putString("mediaUri", mediaUri);
+        outState.putString("last_folder", last_folder);
+    }
+
+    protected void onDestroy() {
+        nativeFinalize();
+        if (wake_lock.isHeld())
+            wake_lock.release();
+        super.onDestroy();
+    }
+
+    // Called from native code. This sets the content of the TextView from the UI thread.
+    private void setMessage(final String message) {
+        final TextView tv = (TextView) this.findViewById(R.id.textview_message);
+        runOnUiThread (new Runnable() {
+          public void run() {
+            tv.setText(message);
+          }
+        });
+    }
+
+    // Set the URI to play, and record whether it is a local or remote file
+    private void setMediaUri() {
+        nativeSetUri (mediaUri);
+        is_local_media = mediaUri.startsWith("file://");
+    }
+
+    // Called from native code. Native code calls this once it has created its pipeline and
+    // the main loop is running, so it is ready to accept commands.
+    private void onGStreamerInitialized () {
+        Log.i ("GStreamer", "GStreamer initialized:");
+        Log.i ("GStreamer", "  playing:" + is_playing_desired + " position:" + position + " uri: " + mediaUri);
+
+        // Restore previous playing state
+        setMediaUri ();
+        nativeSetPosition (position);
+        if (is_playing_desired) {
+            nativePlay();
+            wake_lock.acquire();
+        } else {
+            nativePause();
+            wake_lock.release();
+        }
+
+        // Re-enable buttons, now that GStreamer is initialized
+        final Activity activity = this;
+        runOnUiThread(new Runnable() {
+            public void run() {
+                activity.findViewById(R.id.button_play).setEnabled(true);
+                activity.findViewById(R.id.button_stop).setEnabled(true);
+            }
+        });
+    }
+
+    // The text widget acts as an slave for the seek bar, so it reflects what the seek bar shows, whether
+    // it is an actual pipeline position or the position the user is currently dragging to.
+    private void updateTimeWidget () {
+        TextView tv = (TextView) this.findViewById(R.id.textview_time);
+        SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
+        int pos = sb.getProgress();
+
+        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
+        df.setTimeZone(TimeZone.getTimeZone("UTC"));
+        String message = df.format(new Date (pos)) + " / " + df.format(new Date (duration));
+        tv.setText(message);
+    }
+
+    // Called from native code
+    private void setCurrentPosition(final int position, final int duration) {
+        final SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
+
+        // Ignore position messages from the pipeline if the seek bar is being dragged
+        if (sb.isPressed()) return;
+
+        runOnUiThread (new Runnable() {
+          public void run() {
+            sb.setMax(duration);
+            sb.setProgress(position);
+            updateTimeWidget();
+            sb.setEnabled(duration != 0);
+          }
+        });
+        this.position = position;
+        this.duration = duration;
+    }
+
+    static {
+        System.loadLibrary("gstreamer_android");
+        System.loadLibrary("tutorial-5");
+        nativeClassInit();
+    }
+
+    public void surfaceChanged(SurfaceHolder holder, int format, int width,
+            int height) {
+        Log.d("GStreamer", "Surface changed to format " + format + " width "
+                + width + " height " + height);
+        nativeSurfaceInit (holder.getSurface());
+    }
+
+    public void surfaceCreated(SurfaceHolder holder) {
+        Log.d("GStreamer", "Surface created: " + holder.getSurface());
+    }
+
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        Log.d("GStreamer", "Surface destroyed");
+        nativeSurfaceFinalize ();
+    }
+
+    // Called from native code when the size of the media changes or is first detected.
+    // Inform the video surface about the new size and recalculate the layout.
+    private void onMediaSizeChanged (int width, int height) {
+        Log.i ("GStreamer", "Media size changed to " + width + "x" + height);
+        final GStreamerSurfaceView gsv = (GStreamerSurfaceView) this.findViewById(R.id.surface_video);
+        gsv.media_width = width;
+        gsv.media_height = height;
+        runOnUiThread(new Runnable() {
+            public void run() {
+                gsv.requestLayout();
+            }
+        });
+    }
+
+    // The Seek Bar thumb has moved, either because the user dragged it or we have called setProgress()
+    public void onProgressChanged(SeekBar sb, int progress, boolean fromUser) {
+        if (fromUser == false) return;
+        desired_position = progress;
+        // If this is a local file, allow scrub seeking, this is, seek as soon as the slider is moved.
+        if (is_local_media) nativeSetPosition(desired_position);
+        updateTimeWidget();
+    }
+
+    // The user started dragging the Seek Bar thumb
+    public void onStartTrackingTouch(SeekBar sb) {
+        nativePause();
+    }
+
+    // The user released the Seek Bar thumb
+    public void onStopTrackingTouch(SeekBar sb) {
+        // If this is a remote file, scrub seeking is probably not going to work smoothly enough.
+        // Therefore, perform only the seek when the slider is released.
+        if (!is_local_media) nativeSetPosition(desired_position);
+        if (is_playing_desired) nativePlay();
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data)
+    {
+        if (resultCode == RESULT_OK && requestCode == PICK_FILE_CODE) {
+            mediaUri = "file://" + data.getStringExtra(FileDialog.RESULT_PATH);
+            position = 0;
+            last_folder = new File (data.getStringExtra(FileDialog.RESULT_PATH)).getParent();
+            Log.i("GStreamer", "Setting last_folder to " + last_folder);
+            setMediaUri();
+        }
+    }
+}