add vulkan example for android

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-examples/-/merge_requests/14>

vulkan/android/.gitignore

@@ -0,0 +1,10 @@
+.cxx/
+.externalNativeBuild/
+.gradle/
+.idea/
+assets/
+build/
+gst-build-*/
+local.properties
+src/org/freedesktop/gstreamer/GStreamer.java
+*.iml

vulkan/android/AndroidManifest.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.freedesktop.gstreamer.vulkan.vulkan_1">
+    <uses-feature android:name="android.hardware.vulkan.version"
+        android:version="0x400003"
+        android:required="true"/>
+    <application android:label="@string/app_name">
+        <activity android:name="org.freedesktop.gstreamer.vulkan.Vulkan1"
+                  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>

vulkan/android/build.gradle

@@ -0,0 +1,89 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 24
+    buildToolsVersion '28.0.3'
+
+    defaultConfig {
+        applicationId "org.freedesktop.gstreamer.vulkan.vulkan_1"
+        minSdkVersion 24
+        targetSdkVersion 24
+        versionCode 1
+        versionName "1.0"
+        archivesBaseName = "$applicationId-v$versionCode"
+
+        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 "vulkan-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'
+}
+
+buildscript {
+    repositories {
+        jcenter()
+        google()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+    }
+}
+
+repositories {
+    jcenter()
+    google()
+}

vulkan/android/gradle.properties

@@ -0,0 +1,23 @@
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+# Default value: -Xmx10248m -XX:MaxPermSize=256m
+# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+
+# gstAndroidRoot can be set to point to the unpacked GStreamer android top-level directory
+# containing each architecture in subdirectories, or else set the GSTREAMER_ROOT_ANDROID
+# environment variable to that location
+# gstAndroidRoot=/path/to/gstreamer/android

vulkan/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sat Apr 21 19:58:19 WEST 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip

vulkan/android/gradlew

@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

vulkan/android/gradlew.bat

@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

vulkan/android/jni/Android.mk

@@ -0,0 +1,34 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := vulkan-1
+LOCAL_SRC_FILES := vulkan-1.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) vulkan androidmedia
+GSTREAMER_EXTRA_DEPS      := gstreamer-video-1.0 gobject-2.0
+GSTREAMER_EXTRA_LIBS      := -liconv
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

vulkan/android/jni/Application.mk

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

vulkan/android/jni/vulkan-1.c

@@ -0,0 +1,403 @@
+#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 ! vulkanupload ! vulkancolorconvert ! vulkansink",
+      &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, "vulkan-1", 0, "Android vulkan 1");
+  gst_debug_set_threshold_for_name ("vulkan-1", GST_LEVEL_DEBUG);
+  gst_debug_set_threshold_from_string ("3,*vulkan*:7", FALSE);
+  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, "vulkan-1",
+        "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, "vulkan-1",
+        "Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env,
+      "org/freedesktop/gstreamer/vulkan/Vulkan1");
+  (*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;
+}

vulkan/android/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.vulkan.GStreamerSurfaceView
+        android:id="@+id/surface_video"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical|center_horizontal" />
+
+</LinearLayout>

vulkan/android/res/values/strings.xml

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

vulkan/android/src/org/freedesktop/gstreamer/vulkan/GStreamerSurfaceView.java

@@ -0,0 +1,85 @@
+package org.freedesktop.gstreamer.vulkan;
+
+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);
+    }
+
+}

vulkan/android/src/org/freedesktop/gstreamer/vulkan/Vulkan1.java

@@ -0,0 +1,144 @@
+package org.freedesktop.gstreamer.vulkan;
+
+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;
+import org.freedesktop.gstreamer.vulkan.vulkan_1.R;
+
+public class Vulkan1 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("vulkan-1");
+        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 ();
+    }
+
+}