smaller audio buffer will cause faster audio playing but not good

jni/ffmpeg/android/com_media_ffmpeg_android_FFMpegPlayerAndroid.cpp

@@ -232,14 +232,15 @@ static int FFMpegPlayerAndroid_processAudio(JNIEnv *env, AVPacket *packet, int16
 		samples_size = size;
 		samples = (int16_t *) av_malloc(samples_size);
 	}
-
+	
 	int len = avcodec_decode_audio3(ffmpeg_audio.codec_ctx, samples, &samples_size, packet);
-	/*if(*/AndroidAudioTrack_write(samples, samples_size);// <= 0) {
-	/*	jniThrowException(env,
+	if(AndroidAudioTrack_write(samples, samples_size) <= 0) {
+		jniThrowException(env,
 						  "java/io/IOException",
 						  "Couldn't write bytes to audio track");
 		return -1;
-	}*/
+	}
+	AndroidAudioTrack_flush();
 	return 0;
 }
 
@@ -284,6 +285,12 @@ static void FFMpegPlayerAndroid_play(JNIEnv *env, jobject obj, jobject bitmap, j
 							  "Couldn't register audio track");
 			return;
 		}
+		if(AndroidAudioTrack_start() != ANDROID_AUDIOTRACK_RESULT_SUCCESS) {
+			jniThrowException(env,
+							  "java/io/IOException",
+							  "Couldn't start audio track");
+			return;
+		}
 	}
 
 	status = STATE_PLAYING;

jni/include/android/audiotrack.h

@@ -24,12 +24,21 @@
 #define ANDROID_AUDIOTRACK_RESULT_BAD_PARAMETER			-1
 #define ANDROID_AUDIOTRACK_RESULT_JNI_EXCEPTION			-2
 #define ANDROID_AUDIOTRACK_RESULT_ALLOCATION_FAILED		-3
+#define ANDROID_AUDIOTRACK_RESULT_ERRNO					-4
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 int AndroidAudioTrack_register(JNIEnv* env, jobject jaudioTrack);
+
+int AndroidAudioTrack_start();
+
+int AndroidAudioTrack_flush();
+
+int AndroidAudioTrack_stop();
+
+int AndroidAudioTrack_reload();
 
 int AndroidAudioTrack_unregister();
 

src/com/media/ffmpeg/android/FFMpegPlayerAndroid.java

@@ -24,23 +24,6 @@
 import android.widget.MediaController.MediaPlayerControl;
 
 /**
- * 
- * playing audio track in static mode:
- * 
- * Hi,
-	Peter, Dave, do you have a clear description of what to do ? 
-	I also want to replay a static AudioTrack instance, but i'm facing the 
-	problems described below 
-	http://groups.google.com/group/android-beginners/browse_thread/thread... 
-	So basically what i do is : play() => stop() => reloadStaticData() => 
-	play() => etc... 
-	It almost works but when i stop doing this, the sound is still 
-	playing, even if i call release on the AudioTrack or set it to null. 
-	I have noticed that this happens when i'm trying to replay an 
-	AudioTrack more frequently than its duration. No way to play a sound 
-	of 500ms every 250ms : all you can expect it to have it replayed every 
-	500ms.
- * 
  * 
  * @author petr
  *
@@ -162,8 +145,8 @@ private void startVideo() {
 			 					 			 mAudioCodecCtx.getSampleRate(),
 			 					 			 (mAudioCodecCtx.getChannels() == 2) ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO, 
 			 					 			 AudioFormat.ENCODING_PCM_16BIT,
-			 					 			 FFMpegAVCodecTag.AVCODEC_MAX_AUDIO_FRAME_SIZE, 
-			 					 			 AudioTrack.MODE_STATIC);
+			 					 			 mAudioCodecCtx.getFrameSize() * 2, 
+			 					 			 AudioTrack.MODE_STREAM);
 			}
 
 			attachMediaController();