PortAudio的代码

以下是一个使用PortAudio进行录制的基本示例代码：

#include <stdio.h>
#include <stdlib.h>
#include "portaudio.h"

#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (64)

typedef struct {
    float left_phase;
    float right_phase;
} paTestData;

static int recordCallback(const void* inputBuffer, void* outputBuffer,
                          unsigned long framesPerBuffer,
                          const PaStreamCallbackTimeInfo* timeInfo,
                          PaStreamCallbackFlags statusFlags,
                          void* userData) {
    paTestData* data = (paTestData*) userData;
    const float* input = (const float*) inputBuffer;
    (void) outputBuffer;  // Prevent unused variable warnings
    for (int i = 0; i < framesPerBuffer; i++) {
        data->left_phase = *input++;
        data->right_phase = *input++;
    }
    return paContinue;
}

int main(void) {
    PaStreamParameters inputParameters;
    PaStream* stream;
    paTestData data;
    PaError err;

    err = Pa_Initialize();
    if (err != paNoError) {
        printf("Error: failed to initialize PortAudio: %s\n", Pa_GetErrorText(err));
        return -1;
    }

    inputParameters.device = Pa_GetDefaultInputDevice();
    if (inputParameters.device == paNoDevice) {
        printf("Error: no default input device.\n");
        goto error;
    }

    inputParameters.channelCount = 2;
    inputParameters.sampleFormat = paFloat32;
    inputParameters.suggestedLatency = Pa_GetDeviceInfo(inputParameters.device)->defaultLowInputLatency;
    inputParameters.hostApiSpecificStreamInfo = NULL;

    err = Pa_OpenStream(&stream, &inputParameters, NULL, SAMPLE_RATE, FRAMES_PER_BUFFER, paClipOff, recordCallback, &data);
    if (err != paNoError) {
        printf("Error: failed to open stream: %s\n", Pa_GetErrorText(err));
        goto error;
    }

    err = Pa_StartStream(stream);
    if (err != paNoError) {
        printf("Error: failed to start stream: %s\n", Pa_GetErrorText(err));
        goto error;
    }

    printf("Recording...\n");
    getchar();

    err = Pa_StopStream(stream);
    if (err != paNoError) {
        printf("Error: failed to stop stream: %s\n", Pa_GetErrorText(err));
        goto error;
    }

    err = Pa_CloseStream(stream);
    if (err != paNoError) {
        printf("Error: failed to close stream: %s\n", Pa_GetErrorText(err));
        goto error;
    }

    Pa_Terminate();
    return 0;

error:
    Pa_Terminate();
    return -1;
}

这个示例代码使用了PortAudio的API来打开一个音频输入流，并将输入的音频数据写入到一个结构体中。在主函数中，程序等待用户按下任意键，然后停止录制并关闭流。请注意，该示例代码仅提供了最基本的录制功能，并且没有进行任何错误处理或音频数据处理。