implement MediaMetadataRetriever on top of MediaPlayer

also add MediaPlayer.getDuration() and MediaPlayer.getCurrentPosition()

src/api-impl-jni/generated_headers/android_media_MediaPlayer.h

@@ -39,6 +39,22 @@ JNIEXPORT void JNICALL Java_android_media_MediaPlayer_native_1setOnCompletionLis
 JNIEXPORT void JNICALL Java_android_media_MediaPlayer_native_1start
   (JNIEnv *, jclass, jlong);
 
+/*
+ * Class:     android_media_MediaPlayer
+ * Method:    native_getDuration
+ * Signature: (J)I
+ */
+JNIEXPORT jint JNICALL Java_android_media_MediaPlayer_native_1getDuration
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     android_media_MediaPlayer
+ * Method:    native_getCurrentPosition
+ * Signature: (J)I
+ */
+JNIEXPORT jint JNICALL Java_android_media_MediaPlayer_native_1getCurrentPosition
+  (JNIEnv *, jclass, jlong);
+
 #ifdef __cplusplus
 }
 #endif

src/api-impl-jni/media/android_media_MediaPlayer.c

@@ -56,3 +56,19 @@ JNIEXPORT void JNICALL Java_android_media_MediaPlayer_native_1start(JNIEnv *env,
 	gtk_media_stream_set_volume(media_stream, 1.0);
 	gtk_media_stream_play(media_stream);
 }
+
+JNIEXPORT jint JNICALL Java_android_media_MediaPlayer_native_1getDuration(JNIEnv *env, jclass this, jlong media_stream_ptr)
+{
+	GtkMediaStream *media_stream = _PTR(media_stream_ptr);
+
+	// convert from microseconds to milliseconds
+	return gtk_media_stream_get_duration(media_stream) / 1000;
+}
+
+JNIEXPORT jint JNICALL Java_android_media_MediaPlayer_native_1getCurrentPosition(JNIEnv *env, jclass this, jlong media_stream_ptr)
+{
+	GtkMediaStream *media_stream = _PTR(media_stream_ptr);
+
+	// convert from microseconds to milliseconds
+	return gtk_media_stream_get_timestamp(media_stream) / 1000;
+}

src/api-impl/android/media/MediaMetadataRetriever.java

@@ -0,0 +1,37 @@
+package android.media;
+
+import android.content.Context;
+import android.net.Uri;
+
+public class MediaMetadataRetriever {
+
+	private MediaPlayer mediaPlayer;
+
+	public void release() {
+		if (mediaPlayer != null)
+			mediaPlayer.release();
+	}
+
+	public void setDataSource(Context context, Uri uri) {
+		mediaPlayer = new MediaPlayer();
+		mediaPlayer.setDataSource(uri.getPath());
+	}
+
+	public void setDataSource(String path) {
+		mediaPlayer = new MediaPlayer();
+		mediaPlayer.setDataSource(path);
+	}
+
+	public byte[] getEmbeddedPicture() {
+		return null;
+	}
+
+	public String extractMetadata(int key) {
+		switch (key) {
+			case 9/*METADATA_KEY_DURATION*/:
+				return String.valueOf(mediaPlayer.getDuration());
+			default:
+				return null;
+		}
+	}
+}

src/api-impl/android/media/MediaPlayer.java

@@ -68,8 +68,18 @@ public class MediaPlayer {
 
 	public void setVolume(float leftVolume, float rightVolume) {}
 
+	public int getDuration() {
+		return native_getDuration(gtk_media_stream);
+	}
+
+	public int getCurrentPosition() {
+		return native_getCurrentPosition(gtk_media_stream);
+	}
+
 	public static native void native_prepare(long gtk_media_stream);
 	public native long native_setDataSource(String path);
 	public static native void native_setOnCompletionListener(long gtk_media_stream, MediaPlayer.OnCompletionListener listener);
 	public static native void native_start(long gtk_media_stream);
+	public static native int native_getDuration(long gtk_media_stream);
+	public static native int native_getCurrentPosition(long gtk_media_stream);
 }

src/api-impl/meson.build

@@ -279,6 +279,7 @@ srcs = [
 	'android/media/MediaDescription.java',
 	'android/media/MediaFormat.java',
 	'android/media/MediaMetadata.java',
+	'android/media/MediaMetadataRetriever.java',
 	'android/media/MediaPlayer.java',
 	'android/media/MediaRouter.java',
 	'android/media/Ringtone.java',