端口音频遍历音频数据

由于我是PortAudio的新手，我尝试了一个来自互联网的示例程序。该程序能够通过回调功能记录麦克风的输入。

我想获取表示为数值（例如浮点数）的录制音频的每个样本。我无法弄清楚麦克风的录制数据存储在哪里。

这是回调函数：

static int recordCallback(const void *inputBuffer, void *outputBuffer,
    unsigned long framesPerBuffer,
    const PaStreamCallbackTimeInfo* timeInfo,
    PaStreamCallbackFlags statusFlags,
    void *userData)
{
    paTestData *data = (paTestData*)userData;
    const SAMPLE *rptr = (const SAMPLE*)inputBuffer;
    SAMPLE *wptr = &data->recordedSamples[data->frameIndex * NUM_CHANNELS];
    long framesToCalc;
    long i;
    int finished;
    unsigned long framesLeft = data->maxFrameIndex - data->frameIndex;
    (void)outputBuffer; /* Prevent unused variable warnings. */
    (void)timeInfo;
    (void)statusFlags;
    (void)userData;
    if (framesLeft < framesPerBuffer)
    {
        framesToCalc = framesLeft;
        finished = paComplete;
    }
    else
    {
        framesToCalc = framesPerBuffer;
        finished = paContinue;
    }
    if (inputBuffer == NULL)
    {
        for (i = 0; i<framesToCalc; i++)
        {
            *wptr++ = SAMPLE_SILENCE;  /* left */
            if (NUM_CHANNELS == 2) *wptr++ = SAMPLE_SILENCE;  /* right */
        }
    }
    else
    {
        cout << endl << "SAMPLE" << endl;
        for (i = 0; i<framesToCalc; i++)
        {
            *wptr++ = *rptr++;  /* left */
            //cout << rptr<<endl;
            if (NUM_CHANNELS == 2) *wptr++ = *rptr++;  /* right */
        }
    }
    data->frameIndex += framesToCalc;
    return finished;
}

音频输入流在此处初始化：

err = Pa_OpenStream(
        &stream,
        &inputParameters,
        NULL,                  /* &outputParameters, */
        SAMPLE_RATE,
        FRAMES_PER_BUFFER,
        paClipOff,      /* we won't output out of range samples so don't bother clipping them */
        recordCallback,
        &data);