CODEWITHSUNDEEP
androidandroid-mediacodec
roimatola
roimatola

Reputation: 115

MediaCodec and the output format

I am trying to write a video player using the MediaDecoder class, i came across a problem that its blocking my development,

here is a code snippet

extractor = new MediaExtractor();
extractor.setDataSource(filename);

MediaFormat format = extractor.getTrackFormat(i);
extractor.selectTrack(0);

MediaCodec decoder = MediaCodec.createDecoderByType(mime);
decoder.configure(format, null, null, 0);

decoder.start();

ByteBuffer[] inputBuffers = decoder.getInputBuffers();
ByteBuffer[] outputBuffers = decoder.getOutputBuffers();

Log.d(TAG, " "+decoder.getOutputFormat());

The problem is the output format printed changes with each device making it impossible to print it out to an Open GL texture.

Is there a way to force the decoder to output always the same format? If no, does anyone knows of any libraries available to make the conversion?

Thanks a lot for any insights

Upvotes: 3

Views: 4561

Answers (1)

fadden
fadden

Reputation: 52313

The decoder's output format can't be set. In fact, you probably shouldn't even examine it until you receive an updated MediaFormat from dequeueOutputBuffer() -- before the first chunk of data is returned, you'll get a MediaCodec.INFO_OUTPUT_FORMAT_CHANGED result.

If you want to access the decoded frame from OpenGL ES, you should create a Surface from a SurfaceTexture and pass that into the decoder configure() call. It's more efficient, and doesn't require you to know anything about the data format.

For an example, see the DecodeEditEncodeTest.java CTS test, and note in particular the OutputSurface class and how it's used in checkVideoFile().

Upvotes: 6

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