使用MediaCodec和MediaExtractor播放视频和音频

MediaExtractor extractor = new MediaExtractor();
try {
    // 设置数据源
    extractor.setDataSource(filePath);

    int trackCount = extractor.getTrackCount();
    int videoTrackIndex = -1;
    int audioTrackIndex = -1;

    // 查找视频轨和音频轨
    for (int i = 0; i < trackCount; i++) {
        MediaFormat format = extractor.getTrackFormat(i);
        String mime = format.getString(MediaFormat.KEY_MIME);
        if (mime.startsWith("video/")) {
            videoTrackIndex = i;
        } else if (mime.startsWith("audio/")) {
            audioTrackIndex = i;
        }
    }

    if (videoTrackIndex == -1 || audioTrackIndex == -1) {
        throw new IllegalArgumentException("No video or audio track found in file");
    }

    // 选择轨道
    extractor.selectTrack(videoTrackIndex);
    // 可以选择性地处理音频轨道
} catch (IOException e) {
    e.printStackTrace();
}

// 创建解码器
MediaCodec videoCodec = MediaCodec.createDecoderByType(videoMime);
videoCodec.configure(videoFormat, surface, null, 0);
videoCodec.start();

// 缓冲区处理
ByteBuffer[] inputBuffers = videoCodec.getInputBuffers();
ByteBuffer[] outputBuffers = videoCodec.getOutputBuffers();

while (!eosReceived) {
    int inIndex = videoCodec.dequeueInputBuffer(10000);
    if (inIndex >= 0) {
        ByteBuffer buffer = inputBuffers[inIndex];
        // 从extractor读取数据到buffer中
        int sampleSize = extractor.readSampleData(buffer, 0);
        if (sampleSize < 0) {
            // 数据读取完毕
            videoCodec.queueInputBuffer(inIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
            eosReceived = true;
        } else {
            videoCodec.queueInputBuffer(inIndex, 0, sampleSize, extractor.getSampleTime(), 0);
            extractor.advance();
        }
    }

    // 获取解码后的数据
    MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();
    int outIndex = videoCodec.dequeueOutputBuffer(info, 10000);
    switch (outIndex) {
        case MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED:
            outputBuffers = videoCodec.getOutputBuffers();
            break;
        case MediaCodec.INFO_OUTPUT_FORMAT_CHANGED:
            // Subsequent data will conform to new format.
            break;
        case MediaCodec.INFO_TRY_AGAIN_LATER:
            // No output available yet
            break;
        default:
            // 解码成功，使用outputBuffers[outIndex]中的数据
            videoCodec.releaseOutputBuffer(outIndex, true); // Surface作为目标时，设置为true
            break;
    }
}