如何在WASAPICaptureSharedEventDriven中保存raw格式的音频文件

#include <iostream>
#include <fstream>
#include <Windows.h>
#include <mmdeviceapi.h>
#include <audioclient.h>

// 定义音频捕获参数
const int SAMPLE_RATE = 44100; // 采样率
const int CHANNELS = 2; // 声道数
const int BITS_PER_SAMPLE = 16; // 位深度

// 定义音频数据缓冲区大小
const int BUFFER_SIZE = 4096;

// 定义保存的raw格式音频文件名
const char* FILE_NAME = "audio.raw";

// 音频数据事件处理函数
void OnAudioCapture(void* pBuffer, UINT32 numFrames)
{
    std::ofstream file(FILE_NAME, std::ios::binary | std::ios::app);
    file.write(reinterpret_cast<char*>(pBuffer), numFrames * BITS_PER_SAMPLE / 8 * CHANNELS);
    file.close();
}

int main()
{
    // 初始化音频捕获对象
    IMMDeviceEnumerator* pEnumerator;
    IMMDevice* pDevice;
    IAudioClient* pAudioClient;
    WAVEFORMATEX* pWaveFormat;
    IAudioCaptureClient* pCaptureClient;

    CoInitialize(NULL);
    CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator), (void**)&pEnumerator);
    pEnumerator->GetDefaultAudioEndpoint(eCapture, eConsole, &pDevice);
    pDevice->Activate(__uuidof(IAudioClient), CLSCTX_ALL, NULL, (void**)&pAudioClient);
    
    // 配置音频捕获参数
    pAudioClient->GetMixFormat(&pWaveFormat);
    pWaveFormat->nChannels = CHANNELS;
    pWaveFormat->nSamplesPerSec = SAMPLE_RATE;
    pWaveFormat->wBitsPerSample = BITS_PER_SAMPLE;
    pWaveFormat->nBlockAlign = pWaveFormat->nChannels * pWaveFormat->wBitsPerSample / 8;
    pWaveFormat->nAvgBytesPerSec = pWaveFormat->nSamplesPerSec * pWaveFormat->nBlockAlign;
    pAudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, 0, 10000000, 0, pWaveFormat, NULL);
    
    // 设置音频数据缓冲区
    pAudioClient->GetService(__uuidof(IAudioCaptureClient), (void**)&pCaptureClient);
    pAudioClient->Start();
    
    // 开始音频捕获并保存为raw格式文件
    BYTE* pData;
    UINT32 numFrames;
    DWORD flags;
    while (true)
    {
        pCaptureClient->GetBuffer(&pData, &numFrames, &flags, NULL, NULL);
        if (flags & AUDCLNT_BUFFERFLAGS_SILENT)
        {
            // 静音帧处理
        }
        else
        {
            OnAudioCapture(pData, numFrames);
        }
        pCaptureClient->ReleaseBuffer(numFrames);
    }

    // 释放资源
    pCaptureClient->Release();
    pAudioClient->Stop();
    pEnumerator->Release();
    pDevice->Release();
    CoUninitialize();

    return 0;
}