Question

我已添加以下代码。我能够使用麦克风捕捉音频，我可以同时捕捉所有音频。我的最终目标是进行实时音频处理。所以在for循环中，我将捕获音频处理它并将输出放在一个文件中。使用下面的代码，我只能在for循环的第一遍中捕获音频，同样的音频被复制到其余循环中的Cinput变量中。有没有办法捕获实时音频并使用端口音频以最小延迟进行处理？这是我发现的唯一可以使用的跨平台API。目前我在C语言的Windows 8上使用Visual Studio。但是，稍后我可以处理Linux或Mac。

    PaStreamParameters inputparameters;
    PaStream* stream;
    PaError err = paNoError;
    paTestData data;
    data.maxFrameIndex = chunkSz * 100;
    data.frameIndex = 0;
        err = Pa_Initialize();
        if (err != paNoError) return;
        inputparameters.device = Pa_GetDefaultInputDevice();
        if (inputparameters.device == paNoDevice) {
            fprintf(stderr, "Error: No default input device.\n");
            return;
        }

        inputparameters.channelCount = 2;
        inputparameters.sampleFormat = paInt16;
        inputparameters.suggestedLatency = Pa_GetDeviceInfo(inputparameters.device)->defaultLowInputLatency;
        inputparameters.hostApiSpecificStreamInfo = NULL;

    data.livebuf = (short*)malloc(sizeof(short)*(chunkSz)* 100 * 2);

    short *Cinput;
    Cinput = (short*)malloc(10*chunkSz * 2 *100* sizeof(short));
    memset(Cinput, 0, sizeof(short)*10*100*2*chunkSz);
    int newwtemp = 0;

for (int i = 0; i < 10; i++){

        err = Pa_OpenStream(&stream, &inputparameters, NULL, 8000, chunkSz * 100, paClipOff, recordCallback, &data);
        if (err != paNoError) {
            printf("Exiting from Openstream\n");
            return;
        }
    err = Pa_StartStream(stream);
    if (err != paNoError) { 
        printf("Exit from start stream\n");
        return; }
    //printf("\n\n...................now Recording! please speak into the mike....................\n\n"); fflush(stdout);

    while ((err = Pa_IsStreamActive(stream)) == 1)
    {
        Pa_Sleep(1);
        //printf("index = %d\n", data.frameIndex); fflush(stdout);
    }
    if (err < 0) {
        printf("In Is stream active error return\n");
        return;
    }

    for (int k = 0; k < chunkSz*100 * 2; k++){
        Cinput[newwtemp] = data.livebuf[k];
    //  data.livebuf[k] = 0;
        newwtemp++;
    }
    Pa_StopStream(stream);
}
    err = Pa_CloseStream(stream);
    if (err != paNoError){ return; }
       FILE  *fid;
       fid = fopen("recorded.raw", "wb");
       if (fid == NULL)
       {
           printf("Could not open file.");
       }
       else
       {
           fwrite(Cinput, sizeof(short), chunkSz *10* 100*2, fid);
           fclose(fid);
           printf("Wrote data to 'recorded.raw'\n");
       }
       //////////////////////////////////////

如何在C中的for循环中使用端口音频进行实时音频捕获和处理？

0 个答案: