c - PortAudio - 单声道工作，立体声故障？

Question

这让我很难过；这在单声道中效果很好，但是当我将其更改为立体声时，它听起来断断续续和静止。这是一个交错问题还是什么(数据是交错的，顺便说一句)

编辑:将交错方法更改为更合乎逻辑的方法，但仍然无济于事......

    #include <pthread.h>
    #include <portaudio/portaudio.h>
    #include <sndfile.h>

    #define STEREO 2
    #define SAMPLE_RATE 44100

    typedef struct{
        M_float* data, *data_pos;
        sf_count_t frames;
    } StreamData;
    StreamData stream_data;

    int ProcessAudio(const void* input, void* output, ulong frames_per_buff,
            const PaStreamCallbackTimeInfo* time_info, PaStreamCallbackFlags flags, void* strm_data){

    M_StreamData* strm = (M_StreamData*)(strm_data);
    M_float* strm_out = (M_float*)(output);

    if(strm -> frames > frames_per_buff){

        for(sf_count_t frames_iter = 0; frames_iter < frames_per_buff;){
            M_float sample = (strm -> data_pos++)[0];
            strm_out[frames_iter] = sample;
            strm_out[++frames_iter] = sample;
        }

    }else{
        return (paComplete);
    }

    return (paContinue);
}

    void* StartAudio(void* params){
        SF_INFO info;
        info.channels = M_STEREO;
        info.samplerate = M_SAMPLE_RATE;
        info.format = SF_FORMAT_RAW | SF_FORMAT_FLOAT;

        SNDFILE* file = sf_open(u8"californication.raw", SFM_READ, &info);

        stream_data.data = malloc(info.frames * info.channels * sizeof(float));
        stream_data.data_pos = stream_data.data;
        stream_data.frames = sf_readf_float(file, stream_data.data, info.frames);

        sf_close(file);

        if(Pa_Initialize() != paNoError)exit(0);

        PaStream* pa_stream = NULLPTR_T;
        Pa_OpenDefaultStream(&pa_stream, 0, STEREO, paFloat32, SAMPLE_RATE, paFramesPerBufferUnspecified,
                &ProcessAudio, &stream_data);

        Pa_StartStream(pa_stream);
        Pa_Sleep(9001);
        Pa_StopStream(pa_stream);
        Pa_CloseStream(pa_stream);

        sf_close(file);
        free(stream_data.data);

        Pa_Terminate();

        return (NULLPTR_T);
    }

    int main(void){
        static pthread_t thrd;
        pthread_create(&thrd, NULLPTR_T, &M_StartAudio, NULLPTR_T);

        return (false);
    }

Answer 1

如果不编译您的代码，我无法确定，但看起来您的交错算法是将两个样本写入输出缓冲区中的同一索引，而不是将一个样本写入输出缓冲区两次。

这段代码:

  strm_out[frames_iter] = (strm -> data_pos++)[0];
  strm_out[frames_iter] = (strm -> data_pos++)[1];

应该看起来像:

M_float* sample =  (strm -> data_pos++)[0]; 
strm_out[frames_iter] = sample;
strm_out[++frames_iter] = sample;

同样，这可能不完全正确，但希望它说明了我的观点。