I am trying to use the low-level media APIs to decode files in mp3 and other formats so I can process them. I am following the tutorial here to take an encoded file and play it back with an AudioTrack and my code is largely the same but I am getting an error.
Here is my code:
public void playSongMono(View view)
{
//create extractor and point it to file
AssetFileDescriptor fd = getResources().openRawResourceFd(R.raw.song);
MediaExtractor extractor = new MediaExtractor();
extractor.setDataSource(fd.getFileDescriptor(),fd.getStartOffset(),fd.getLength());
//get MIME type of file
MediaFormat inputFormat = extractor.getTrackFormat(0);
Log.d("MonoPlayer","TRACKS #: "+extractor.getTrackCount());
String mime = inputFormat.getString(MediaFormat.KEY_MIME);
Log.d("MonoPlayer","FORMAT: "+mime);
extractor.selectTrack(0);
//create codec
MediaCodec codec = MediaCodec.createDecoderByType(mime);
Log.d("MonoPlayer","1");
codec.configure(inputFormat, null, null, 0);
Log.d("MonoPlayer","2");
codec.start();
Log.d("MonoPlayer","3");
ByteBuffer[] inputBuffers = codec.getInputBuffers();
ByteBuffer[] outputBuffers = codec.getOutputBuffers();
//get a buffer and fill it
int inputBufferIndex = codec.dequeueInputBuffer(1000000);
if(inputBufferIndex >= 0)
{
Log.d("MonoPlayer","4");
//fill the buffer
int sampleSize = extractor.readSampleData(inputBuffers[inputBufferIndex], 0);
long presentationTimeUs = 0;
boolean sawInputEOS= false;
if (sampleSize < 0) {
sawInputEOS = true;
sampleSize = 0;
} else {
presentationTimeUs = extractor.getSampleTime();
}
codec.queueInputBuffer(inputBufferIndex,
0,
sampleSize,
presentationTimeUs,
sawInputEOS ? MediaCodec.BUFFER_FLAG_END_OF_STREAM : 0);
if (!sawInputEOS) {
extractor.advance();
}
}
BufferInfo info = new BufferInfo(); //this will be populated with data by dequeueOutputBuffer
//get the index of a finished buffer. since we only enqueued one we should only wait for one
int resultBufferIndex = codec.dequeueOutputBuffer(info, 1000000);
if (resultBufferIndex >= 0 )
{
Log.d("MonoPlayer","5");
//we now have a buffer of pcm data
byte[] chunk = new byte[info.size];
outputBuffers[resultBufferIndex].get(chunk);
outputBuffers[resultBufferIndex].clear();
codec.releaseOutputBuffer(resultBufferIndex, false);
//create audiotrack to play sound
audiotrack = new AudioTrack(AudioManager.STREAM_MUSIC,
44100,
AudioFormat.CHANNEL_OUT_STEREO,
AudioFormat.ENCODING_PCM_16BIT,
chunk.length,
AudioTrack.MODE_STATIC);
audiotrack.play();
audiotrack.write(chunk, 0, chunk.length);
}
extractor.release();
extractor = null;
codec.stop();
codec.release();
codec = null;
}
And upon execution of this code I get the following logcat output
D MonoPlayer TRACKS #: 1
D MonoPlayer FORMAT: audio/mpeg
I OMXClient Using client-side OMX mux.
D MonoPlayer 1
E OMXNodeInstance OMX_GetExtensionIndex failed
D MonoPlayer 2
D MonoPlayer 3
D MonoPlayer 4
Above is the error I mentioned. I'm not exactly sure why this error is occurring or what it means. However, I have tried to gather some information. The use of log output suggests that the error happens with the line codec.configure(inputFormat, null, null, 0);. I have tried removing the line, which predictably results in an illegal state error but removes the error in question. Additionally, in the code I posted, the Log.d("MonoPlayer","5"); is never reached, even if the time out on the dequeue call is set to indefinite, so I assume the decoder is not properly configured.
If anyone has any information on why I might be getting this error and what I could do to fix it, that would be great. Thanks in advance.
