Qt and ffmpeg, как работать со звуком.

Добрый день.
Так получаю данные звука:

static struct SwsContext *img_convert_ctx;
    int videoStream, i, numBytes, audioStream;
    int ret, got_picture;

    avformat_network_init();   //初始化FFmpeg网络模块
    av_register_all();  //初始化FFMPEG  调用了这个才能正常适用编码器和解码器


    AVFormatContext *pFormatCtx = NULL;
    //Allocate an AVFormatContext.
    pFormatCtx = avformat_alloc_context();

    // Open video file
    if(avformat_open_input(&pFormatCtx, "./Wildlife.wmv", 0, 0) != 0)
        qDebug()<<"Couldn't open file";

    if(avformat_find_stream_info(pFormatCtx, NULL) < 0)
     qDebug()<<"Couldn't find stream information";

    av_dump_format(pFormatCtx, 0, "./Wildlife.wmv", 0);//information abaut file

    //vide0
    AVCodecContext *pCodecCtxOrig = NULL;
    AVCodecContext *pCodecCtx = NULL;
    //audio
    AVCodecContext *aCodecCtxOrig;
    AVCodecContext *aCodecCtx;

    // Find the first video and audio stream
    videoStream = -1;
    audioStream = -1;

    for(i=0; i < pFormatCtx->nb_streams; i++) {
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO
                &&
                videoStream < 0) {
            videoStream=i;
        }
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO &&
                audioStream < 0) {
            audioStream=i;
        }
    }
    if(videoStream==-1)
        qDebug()<<"Didn't find a video stream";
    if(audioStream==-1)
        qDebug()<<"Didn't find a audio stream";

    // Get a pointer to the codec context for the video stream
    pCodecCtx=pFormatCtx->streams[videoStream]->codec;
    //audio
    aCodecCtxOrig=pFormatCtx->streams[audioStream]->codec;
    //aCodecCtx=pFormatCtx->streams[audioStream]->codec;

    //audio
    AVCodec *aCodec;

    aCodec = avcodec_find_decoder(aCodecCtxOrig->codec_id);
    if(!aCodec) {
     qDebug()<<"Unsupported codec!";
    }
    // Copy context
    aCodecCtx = avcodec_alloc_context3(aCodec);
    if(avcodec_copy_context(aCodecCtx, aCodecCtxOrig) != 0) {
     qDebug()<<"Couldn't copy codec contextt";
    }
    /* set up SDL Audio here */

    avcodec_open2(aCodecCtx, aCodec, NULL);

Так предлогается работать со звуком с помощью STL:

wanted_spec.freq = aCodecCtx->sample_rate;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = aCodecCtx->channels;
wanted_spec.silence = 0;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
wanted_spec.callback = audio_callback;
wanted_spec.userdata = aCodecCtx;

if(SDL_OpenAudio(&wanted_spec, &spec) < 0) {
 fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
 return -1;
}

Начал делать так:

    QAudioRecorder audioRecorder;    
    QAudioEncoderSettings audioSettings;
    audioSettings.setCodec("audio/amr");
    audioSettings.setQuality(QMultimedia::HighQuality);
    audioRecorder.setEncodingSettings(audioSettings);

Как правильно сделать воспроизведение с помощью Qt?