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POHow to use Android MediaCodec encode Camera data(YUV420sp)
 

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  1. POHow to use Android MediaCodec encode Camera data(YUV420sp)
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    <p>Thank you for your focus! I want to use Android MediaCodec APIs to encode the video frame which aquired from Camera, unfortunately, I have not success to do that! I still not familiar with the MediaCodec API。 The follow is my codes,I need your help to figure out what I should do.</p> <p>1、The Camera setting:</p> <pre><code>Parameters parameters = mCamera.getParameters(); parameters.setPreviewFormat(ImageFormat.NV21); parameters.setPreviewSize(320, 240); mCamera.setParameters(parameters); </code></pre> <p>2、Set the encoder:</p> <pre><code>private void initCodec() { try { fos = new FileOutputStream(mVideoFile, false); } catch (FileNotFoundException e) { e.printStackTrace(); } mMediaCodec = MediaCodec.createEncoderByType("video/avc"); MediaFormat mediaFormat = MediaFormat.createVideoFormat("video/avc", 320, 240); mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 125000); mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 15); mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar); mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5); mMediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE); mMediaCodec.start(); inputBuffers = mMediaCodec.getInputBuffers(); outputBuffers = mMediaCodec.getOutputBuffers(); } private void encode(byte[] data) { int inputBufferIndex = mMediaCodec.dequeueInputBuffer(0); if (inputBufferIndex &gt;= 0) { ByteBuffer inputBuffer = inputBuffers[inputBufferIndex]; inputBuffer.clear(); inputBuffer.put(data); mMediaCodec.queueInputBuffer(inputBufferIndex, 0, data.length, 0, 0); } else { return; } MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo(); int outputBufferIndex = mMediaCodec.dequeueOutputBuffer(bufferInfo, 0); Log.i(TAG, "outputBufferIndex--&gt;" + outputBufferIndex); do { if (outputBufferIndex &gt;= 0) { ByteBuffer outBuffer = outputBuffers[outputBufferIndex]; System.out.println("buffer info--&gt;" + bufferInfo.offset + "--" + bufferInfo.size + "--" + bufferInfo.flags + "--" + bufferInfo.presentationTimeUs); byte[] outData = new byte[bufferInfo.size]; outBuffer.get(outData); try { if (bufferInfo.offset != 0) { fos.write(outData, bufferInfo.offset, outData.length - bufferInfo.offset); } else { fos.write(outData, 0, outData.length); } fos.flush(); Log.i(TAG, "out data -- &gt; " + outData.length); mMediaCodec.releaseOutputBuffer(outputBufferIndex, false); outputBufferIndex = mMediaCodec.dequeueOutputBuffer(bufferInfo, 0); } catch (IOException e) { e.printStackTrace(); } } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) { outputBuffers = mMediaCodec.getOutputBuffers(); } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) { MediaFormat format = mMediaCodec.getOutputFormat(); } } while (outputBufferIndex &gt;= 0); } </code></pre> <p>I guess the problem occurred in the encoder method,the method will be used in the Camera Preview Callback ,like</p> <pre><code>initCodec(); //mCamera.setPreviewCallback(new MyPreviewCallback()); mCamera.setPreviewCallback(new PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) { encode(data); } }); </code></pre> <p>I just have no idea how to do it correctly with the MediaCodec API.Can you give me some advice or links about it?</p> <p>Thank you!</p>
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