NuPlayerRenderer 将解码输出的数据重定向到文件中

NuPlayerRenderer不会直接将解码输出的数据重定向到文件中，它的主要功能是将媒体数据渲染到音频和视频设备上。如果需要将解码输出的数据写入文件中，可以使用MediaExtractor和MediaCodec进行解码，并将解码后的数据写入文件。以下是一个简单的例子：

MediaExtractor extractor = new MediaExtractor();
extractor.setDataSource(filePath);
int trackIndex = selectTrack(extractor, "video/");
extractor.selectTrack(trackIndex);
MediaFormat format = extractor.getTrackFormat(trackIndex);
MediaCodec decoder = MediaCodec.createDecoderByType(format.getString(MediaFormat.KEY_MIME));
decoder.configure(format, null, null, 0);
decoder.start();
FileOutputStream outputStream = new FileOutputStream(outputFilePath);
ByteBuffer[] inputBuffers = decoder.getInputBuffers();
ByteBuffer[] outputBuffers = decoder.getOutputBuffers();
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
boolean isEOS = false;
while (!isEOS) {
    int inputBufferIndex = decoder.dequeueInputBuffer(10000);
    if (inputBufferIndex >= 0) {
        ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
        int sampleSize = extractor.readSampleData(inputBuffer, 0);
        if (sampleSize < 0) {
            decoder.queueInputBuffer(inputBufferIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
            isEOS = true;
        } else {
            decoder.queueInputBuffer(inputBufferIndex, 0, sampleSize, extractor.getSampleTime(), 0);
            extractor.advance();
        }
    }
    int outputBufferIndex = decoder.dequeueOutputBuffer(bufferInfo, 10000);
    if (outputBufferIndex >= 0) {
        ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];
        byte[] data = new byte[bufferInfo.size];
        outputBuffer.get(data);
        outputBuffer.clear();
        outputStream.write(data);
        decoder.releaseOutputBuffer(outputBufferIndex, false);
    }
}
decoder.stop();
decoder.release();
extractor.release();
outputStream.close();