问无法通过Android MediaCodec API转换音频

EN

private void transcodeFile(File source, File destination) throws IOException {
    FileInputStream inputStream = new FileInputStream(source);
    FileOutputStream outputStream = new FileOutputStream(destination);

    log("Transcoding file: " + source.getName());

    MediaExtractor extractor;
    MediaCodec encoder;
    MediaCodec decoder;

    ByteBuffer[] encoderInputBuffers;
    ByteBuffer[] encoderOutputBuffers;
    ByteBuffer[] decoderInputBuffers;
    ByteBuffer[] decoderOutputBuffers;

    int noOutputCounter = 0;
    int noOutputCounterLimit = 10;

    extractor = new MediaExtractor();
    extractor.setDataSource(inputStream.getFD());
    extractor.selectTrack(0);

    log(String.format("TRACKS #: %d", extractor.getTrackCount()));
    MediaFormat format = extractor.getTrackFormat(0);
    String mime = format.getString(MediaFormat.KEY_MIME);
    log(String.format("MIME TYPE: %s", mime));


    final String outputType = MediaFormat.MIMETYPE_AUDIO_AAC;
    encoder = MediaCodec.createEncoderByType(outputType);
    MediaFormat encFormat = MediaFormat.createAudioFormat(outputType, 44100, 2);
    encFormat.setInteger(MediaFormat.KEY_BIT_RATE, 64000);
    encoder.configure(encFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);

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

    encoder.start();
    decoder.start();

    encoderInputBuffers = encoder.getInputBuffers();
    encoderOutputBuffers = encoder.getOutputBuffers();

    decoderInputBuffers = decoder.getInputBuffers();
    decoderOutputBuffers = decoder.getOutputBuffers();

    int timeOutUs = 1000;
    long presentationTimeUs = 0;

    MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();
    boolean inputEOS = false;
    boolean outputEOS = false;

    while(!outputEOS && noOutputCounter < noOutputCounterLimit) {
        noOutputCounter++;

        if(!inputEOS) {
            int decInputBufferIndex = decoder.dequeueInputBuffer(timeOutUs);
            log("decInputBufferIndex: " + decInputBufferIndex);
            if (decInputBufferIndex >= 0) {
                ByteBuffer dstBuffer = decoderInputBuffers[decInputBufferIndex];

                //Getting sample with MediaExtractor
                int sampleSize = extractor.readSampleData(dstBuffer, 0);
                if (sampleSize < 0) {
                    inputEOS = true;
                    log("Input EOS");
                    sampleSize = 0;
                } else {
                    presentationTimeUs = extractor.getSampleTime();
                }

                log("Input sample size: " + sampleSize);

                //Enqueue decoder input buffer
                decoder.queueInputBuffer(decInputBufferIndex, 0, sampleSize, presentationTimeUs, inputEOS ? MediaCodec.BUFFER_FLAG_END_OF_STREAM : 0);
                if (!inputEOS) extractor.advance();

            } else {
                log("decInputBufferIndex: " + decInputBufferIndex);
            }
        }

        //Dequeue decoder output buffer
        int res = decoder.dequeueOutputBuffer(info, timeOutUs);
        if(res >= 0) {
            if(info.size > 0) noOutputCounter = 0;

            int decOutputBufferIndex = res;
            log("decOutputBufferIndex: " + decOutputBufferIndex);

            ByteBuffer buffer = decoderOutputBuffers[decOutputBufferIndex];
            buffer.position(info.offset);
            buffer.limit(info.offset + info.size);

            final int size = buffer.limit();
            if(size > 0) {
                //audioTrack.write(buffer, buffer.limit(), AudioTrack.MODE_STATIC);

                int encInputBufferIndex = encoder.dequeueInputBuffer(-1);
                log("encInputBufferIndex: " + encInputBufferIndex);
                //fill the input buffer with the decoded data
                if(encInputBufferIndex >= 0) {
                    ByteBuffer dstBuffer = encoderInputBuffers[encInputBufferIndex];
                    dstBuffer.clear();
                    dstBuffer.put(buffer);

                    encoder.queueInputBuffer(encInputBufferIndex, 0, info.size, info.presentationTimeUs, 0);
                    int encOutputBufferIndex = encoder.dequeueOutputBuffer(info, timeOutUs);
                    if(encOutputBufferIndex >= 0) {
                        log("encOutputBufferIndex: " + encOutputBufferIndex);
                        ByteBuffer outBuffer = encoderOutputBuffers[encOutputBufferIndex];
                        byte[] out = new byte[outBuffer.remaining()];
                        outBuffer.get(out);
                        //write data to file
                        outputStream.write(out);
                    }
                }
            }
            decoder.releaseOutputBuffer(decOutputBufferIndex, false);
            if((info.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
                outputEOS = true;
                log("Output EOS");
            }
        } else if (res == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
            decoderOutputBuffers = decoder.getOutputBuffers();
            log("Output buffers changed.");
        } else if (res == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
            log("Output format changed.");
        } else {
            log("Dequeued output buffer returned: " + res);
        }
    }

    log("Stopping..");
    releaseCodec(decoder);
    releaseCodec(encoder);
    inputStream.close();
    outputStream.close();

}