Initial tutorial 2

gst-sdk/tutorials/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="com.gst_sdk_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/gst_sdk_icon">
+        <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> 

gst-sdk/tutorials/android-tutorial-2/jni/Android.mk

@@ -0,0 +1,19 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := tutorial-2
+LOCAL_SRC_FILES := tutorial-2.c
+LOCAL_SHARED_LIBRARIES := gstreamer_android
+include $(BUILD_SHARED_LIBRARY)
+
+ifndef GSTREAMER_SDK_ROOT
+ifndef GSTREAMER_SDK_ROOT_ANDROID
+$(error GSTREAMER_SDK_ROOT_ANDROID is not defined!)
+endif
+GSTREAMER_SDK_ROOT        := $(GSTREAMER_SDK_ROOT_ANDROID)
+endif
+GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_SDK_ROOT)/share/gst-android/ndk-build/
+include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
+GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_SYS)
+include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer.mk

gst-sdk/tutorials/android-tutorial-2/jni/tutorial-2.c

@@ -0,0 +1,256 @@
+#include <string.h>
+#include <jni.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
+
+typedef struct _CustomData {
+  jobject app;
+  GstElement *pipeline;
+  GMainContext *context;
+  GMainLoop *main_loop;
+  gboolean initialized;
+} CustomData;
+
+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
+ */
+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;
+}
+
+static void detach_current_thread (void *env) {
+  GST_DEBUG ("Detaching thread %p", g_thread_self ());
+  (*java_vm)->DetachCurrentThread (java_vm);
+}
+
+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;
+}
+
+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);
+}
+
+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);
+}
+
+static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
+  JNIEnv *env = get_jni_env ();
+  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);
+  }
+}
+
+static void check_initialization_complete (CustomData *data) {
+  JNIEnv *env = get_jni_env ();
+  /* Check if all conditions are met to report GStreamer as initialized.
+   * These conditions will change depending on the application */
+  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;
+  }
+}
+
+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, so we do not interfere with other libraries using GLib */
+  data->context = g_main_context_new ();
+
+  /* Build pipeline */
+  data->pipeline = gst_parse_launch("audiotestsrc ! 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_unref (data->context);
+  gst_element_set_state (data->pipeline, GST_STATE_NULL);
+  gst_object_unref (data->pipeline);
+
+  return NULL;
+}
+
+/*
+ * Java Bindings
+ */
+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 ("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);
+}
+
+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");
+}
+
+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);
+}
+
+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);
+}
+
+jboolean gst_class_init (JNIEnv* env, jclass klass) {
+  gst_debug_set_threshold_for_name("tutorial-2", GST_LEVEL_DEBUG);
+  custom_data_field_id = (*env)->GetFieldID (env, klass, "native_custom_data", "J");
+  GST_DEBUG ("The FieldID for the native_custom_data field is %p", custom_data_field_id);
+  set_message_method_id = (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
+  GST_DEBUG ("The MethodID for the setMessage method is %p", set_message_method_id);
+  on_gstreamer_initialized_method_id = (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
+  GST_DEBUG ("The MethodID for the onGStreamerInitialized method is %p", on_gstreamer_initialized_method_id);
+
+  if (!custom_data_field_id || !set_message_method_id || !on_gstreamer_initialized_method_id) {
+    GST_ERROR ("The calling class does not implement all necessary interface methods");
+    return JNI_FALSE;
+  }
+  return JNI_TRUE;
+}
+
+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},
+  { "classInit", "()Z", (void *) gst_class_init}
+};
+
+jint JNI_OnLoad(JavaVM *vm, void *reserved) {
+  JNIEnv *env = NULL;
+
+  GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-2", 0, "Android tutorial 2");
+
+  java_vm = vm;
+
+  if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) {
+    GST_ERROR ("Could not retrieve JNIEnv");
+    return 0;
+  }
+  jclass klass = (*env)->FindClass (env, "com/gst_sdk_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;
+}

gst-sdk/tutorials/android-tutorial-2/res/layout/main.xml

@@ -0,0 +1,34 @@
+<?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_message"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        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>

gst-sdk/tutorials/android-tutorial-2/res/values/strings.xml

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

gst-sdk/tutorials/android-tutorial-2/src/com/gst_sdk_tutorials/tutorial_2/Tutorial2.java

@@ -0,0 +1,113 @@
+package com.gst_sdk_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 com.gst_sdk.GStreamer;
+
+public class Tutorial2 extends Activity {
+    private native void nativeInit();
+    private native void nativeFinalize();
+    private native void nativePlay();
+    private native void nativePause();
+    private static native boolean classInit();
+    private long native_custom_data;
+
+    private boolean is_playing_desired;
+
+    private Bundle initialization_data;
+
+    /* 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);
+
+        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();
+            }
+        });
+
+        initialization_data = savedInstanceState;
+
+        /* Start with disabled buttons, until GStreamer is initialized */
+        this.findViewById(R.id.button_play).setEnabled(false);
+        this.findViewById(R.id.button_stop).setEnabled(false);
+        is_playing_desired = 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 */
+    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 */
+    private void onGStreamerInitialized () {    	
+        if (initialization_data != null) {
+            is_playing_desired = initialization_data.getBoolean("playing");
+            Log.i ("GStreamer", "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 */
+        this.findViewById(R.id.button_play).setEnabled(true);
+        this.findViewById(R.id.button_stop).setEnabled(true);
+    }
+
+    static {
+        System.loadLibrary("gstreamer_android");
+        System.loadLibrary("tutorial-2");
+        classInit();
+    }
+
+}