MediaExtractor是用于提取媒体数据轨道的Android类，它不会在提取过程中修改提取的数据。因此，我们需要自己处理媒体数据以删除ADTS头信息。

以下是示例代码，用于从AAC文件中提取音频轨道并删除ADTS头信息：

MediaExtractor extractor = new MediaExtractor(); extractor.setDataSource("/path/to/aac/file"); int numTracks = extractor.getTrackCount(); int audioTrackIndex = -1; for (int i = 0; i < numTracks; i++) { MediaFormat format = extractor.getTrackFormat(i); String mime = format.getString(MediaFormat.KEY_MIME); if (mime.startsWith("audio/")) { audioTrackIndex = i; break; } } extractor.selectTrack(audioTrackIndex);

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

ByteBuffer[] inputBuffers = codec.getInputBuffers(); ByteBuffer[] outputBuffers = codec.getOutputBuffers(); MediaCodec.BufferInfo info = new MediaCodec.BufferInfo(); boolean isEOS = false; while (!isEOS) { int inIndex = codec.dequeueInputBuffer(10000); if (inIndex >= 0) { ByteBuffer buffer = inputBuffers[inIndex]; int sampleSize = extractor.readSampleData(buffer, 0); if (sampleSize < 0) { codec.queueInputBuffer(inIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM); isEOS = true; } else { codec.queueInputBuffer(inIndex, 0, sampleSize, extractor.getSampleTime(), 0); extractor.advance(); } }

int outIndex = codec.dequeueOutputBuffer(info, 10000);
switch (outIndex) {
    case MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED:
        outputBuffers = codec.getOutputBuffers();
        break;
    case MediaCodec.INFO_OUTPUT_FORMAT_CHANGED:
        MediaFormat newFormat = codec.getOutputFormat();
        // do something with newFormat
        break;
    case MediaCodec.INFO_TRY_AGAIN_LATER:
        // do nothing
        break;
    default:
        ByteBuffer outBuffer = outputBuffers[outIndex];
        byte[] data = new byte[info.size];
        outBuffer.get(data);
        if ((info.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {
            // this buffer contains codec-specific configuration data
            // skip it
        } else {
            // remove ADTS header from AAC buffer
            int bytesRemoved = removeAdtsHeader(data, info.size);
            codec.queueOutputBuffer(outIndex, 0, info.size - bytesRemoved, info.presentationTimeUs, info.flags);
        }
        codec.releaseOutputBuffer(outIndex, false);
        break;
}

}

codec.stop(); codec.release(); extractor.release();

private static final int ADTS_HEADER_SIZE = 7; private static int removeAdtsHeader(byte[] data, int size) { int numRemoved = 0; while (size >= ADTS_HEADER_SIZE) { // check if the buffer starts with ADTS header int sync = ((data[0] & 0xff) << 4) | ((data[1] & 0xff) >> 4); if (sync != 0xfff) { break; // not ADTS header } // calculate size of ADTS header, and remove it from buffer int headerSize = ((data[3] & 0x03) << 11