Java MediaCodec.dequeueOutputBuffer方法代碼示例

import android.media.MediaCodec; //導入方法依賴的package包/類
private void handleCodecOutput(MediaCodec mediaCodec,
                               ByteBuffer[] codecOutputBuffers,
                               MediaCodec.BufferInfo bufferInfo,
                               OutputStream outputStream)
    throws IOException
{
  int codecOutputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);

  while (codecOutputBufferIndex != MediaCodec.INFO_TRY_AGAIN_LATER) {
    if (codecOutputBufferIndex >= 0) {
      ByteBuffer encoderOutputBuffer = codecOutputBuffers[codecOutputBufferIndex];

      encoderOutputBuffer.position(bufferInfo.offset);
      encoderOutputBuffer.limit(bufferInfo.offset + bufferInfo.size);

      if ((bufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != MediaCodec.BUFFER_FLAG_CODEC_CONFIG) {
        byte[] header = createAdtsHeader(bufferInfo.size - bufferInfo.offset);


        outputStream.write(header);

        byte[] data = new byte[encoderOutputBuffer.remaining()];
        encoderOutputBuffer.get(data);
        outputStream.write(data);
      }

      encoderOutputBuffer.clear();

      mediaCodec.releaseOutputBuffer(codecOutputBufferIndex, false);
    }  else if (codecOutputBufferIndex== MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
      codecOutputBuffers = mediaCodec.getOutputBuffers();
    }

    codecOutputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
  }

}
 

import android.media.MediaCodec; //導入方法依賴的package包/類
/**
 * Reads bytes from the given recorder and encodes them with the given encoder.
 * Uses the (deprecated) Synchronous Processing using Buffer Arrays.
 * <p/>
 * Encoders (or codecs that generate compressed data) will create and return the codec specific
 * data before any valid output buffer in output buffers marked with the codec-config flag.
 * Buffers containing codec-specific-data have no meaningful timestamps.
 */
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
private void recorderEncoderLoop(MediaCodec codec, SpeechRecord speechRecord) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        codec.start();
        // Getting some buffers (e.g. 4 of each) to communicate with the codec
        ByteBuffer[] codecInputBuffers = codec.getInputBuffers();
        ByteBuffer[] codecOutputBuffers = codec.getOutputBuffers();
        Log.i("input buffers " + codecInputBuffers.length + "; output buffers: " + codecOutputBuffers.length);
        boolean doneSubmittingInput = false;
        int numRetriesDequeueOutputBuffer = 0;
        int index;
        while (true) {
            if (!doneSubmittingInput) {
                index = codec.dequeueInputBuffer(DEQUEUE_TIMEOUT);
                if (index >= 0) {
                    int size = queueInputBuffer(codec, codecInputBuffers, index, speechRecord);
                    if (size == -1) {
                        codec.queueInputBuffer(index, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
                        Log.i("enc: in: EOS");
                        doneSubmittingInput = true;
                    } else {
                        Log.i("enc: in: " + size);
                        mNumBytesSubmitted += size;
                    }
                } else {
                    Log.i("enc: in: timeout, will try again");
                }
            }
            MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();
            index = codec.dequeueOutputBuffer(info, DEQUEUE_TIMEOUT);
            Log.i("enc: out: flags/index: " + info.flags + "/" + index);
            if (index == MediaCodec.INFO_TRY_AGAIN_LATER) {
                Log.i("enc: out: INFO_TRY_AGAIN_LATER: " + numRetriesDequeueOutputBuffer);
                if (++numRetriesDequeueOutputBuffer > MAX_NUM_RETRIES_DEQUEUE_OUTPUT_BUFFER) {
                    break;
                }
            } else if (index == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
                MediaFormat format = codec.getOutputFormat();
                Log.i("enc: out: INFO_OUTPUT_FORMAT_CHANGED: " + format.toString());
            } else if (index == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
                codecOutputBuffers = codec.getOutputBuffers();
                Log.i("enc: out: INFO_OUTPUT_BUFFERS_CHANGED");
            } else {
                dequeueOutputBuffer(codec, codecOutputBuffers, index, info);
                mNumBytesDequeued += info.size;
                if ((info.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
                    Log.i("enc: out: EOS");
                    break;
                }
            }
        }
        codec.stop();
        codec.release();
    }
}
 

import android.media.MediaCodec; //導入方法依賴的package包/類
private static void renderHevcImage(ByteBuffer bitstream, ImageInfo info, Surface surface) {
    long beginTime = SystemClock.elapsedRealtimeNanos();

    // configure HEVC decoder
    MediaCodec decoder = configureDecoder(info, bitstream.limit(), surface);
    MediaFormat outputFormat = decoder.getOutputFormat();
    Log.d(TAG, "HEVC output-format=" + outputFormat);

    decoder.start();
    try {
        // set bitstream to decoder
        int inputBufferId = decoder.dequeueInputBuffer(-1);
        if (inputBufferId < 0) {
            throw new IllegalStateException("dequeueInputBuffer return " + inputBufferId);
        }
        ByteBuffer inBuffer = decoder.getInputBuffer(inputBufferId);
        inBuffer.put(bitstream);
        decoder.queueInputBuffer(inputBufferId, 0, bitstream.limit(), 0, 0);

        // notify end of stream
        inputBufferId = decoder.dequeueInputBuffer(-1);
        if (inputBufferId < 0) {
            throw new IllegalStateException("dequeueInputBuffer return " + inputBufferId);
        }
        decoder.queueInputBuffer(inputBufferId, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);

        // get decoded image
        MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
        while (true) {
            int outputBufferId = decoder.dequeueOutputBuffer(bufferInfo, -1);
            if (outputBufferId >= 0) {
                decoder.releaseOutputBuffer(outputBufferId, true);
                break;
            } else if (outputBufferId == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
                outputFormat = decoder.getOutputFormat();
                Log.d(TAG, "HEVC output-format=" + outputFormat);
            } else {
                Log.d(TAG, "HEVC dequeueOutputBuffer return " + outputBufferId);
            }
        }
        decoder.flush();
    } finally {
        decoder.stop();
        decoder.release();
    }
    long endTime = SystemClock.elapsedRealtimeNanos();
    Log.i(TAG, "HEVC decoding elapsed=" + (endTime - beginTime) / 1000000.f + "[msec]");
}