本文主要是介绍windows下使用CoreAudio采集音频，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
最近看obs的音频采集，发现它在采集音频时用到了两个方法：默认音频设备时采用CoreAudio、指定音频设备时采用DirectShow
对windows下的CoreAudio技术不是太熟，于是就认真学了一下。
参考微软官方文档：https://docs.microsoft.com/zh-cn/windows/desktop/CoreAudio/capturing-a-stream
//-----------------------------------------------------------
// Record an audio stream from the default audio capture
// device. The RecordAudioStream function allocates a shared
// buffer big enough to hold one second of PCM audio data.
// The function uses this buffer to stream data from the
// capture device. The main loop runs every 1/2 second.
//-----------------------------------------------------------
#include <mmdeviceapi.h>
#include <Audioclient.h>
#include <audiopolicy.h>
#include <devicetopology.h>
#include <endpointvolume.h>
#include <stdio.h>
// REFERENCE_TIME time units per second and per millisecond
#define REFTIMES_PER_SEC 10000000
#define REFTIMES_PER_MILLISEC 10000#define EXIT_ON_ERROR(hres) \if (FAILED(hres)) { goto Exit; }
#define SAFE_RELEASE(punk) \if ((punk) != NULL) \{ (punk)->Release(); (punk) = NULL; }const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
const IID IID_IAudioClient = __uuidof(IAudioClient);
const IID IID_IAudioCaptureClient = __uuidof(IAudioCaptureClient);HRESULT RecordAudioStream()
{HRESULT hr;REFERENCE_TIME hnsRequestedDuration = REFTIMES_PER_SEC;REFERENCE_TIME hnsActualDuration;UINT32 bufferFrameCount;UINT32 numFramesAvailable;IMMDeviceEnumerator *pEnumerator = NULL;IMMDevice *pDevice = NULL;IAudioClient *pAudioClient = NULL;IAudioCaptureClient *pCaptureClient = NULL;WAVEFORMATEX *pwfx = NULL;UINT32 packetLength = 0;BOOL bDone = FALSE;BYTE *pData;DWORD flags;hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL,CLSCTX_ALL, IID_IMMDeviceEnumerator,(void**)&pEnumerator);EXIT_ON_ERROR(hr)hr = pEnumerator->GetDefaultAudioEndpoint(eCapture, eConsole, &pDevice);EXIT_ON_ERROR(hr)hr = pDevice->Activate(IID_IAudioClient, CLSCTX_ALL,NULL, (void**)&pAudioClient);EXIT_ON_ERROR(hr)hr = pAudioClient->GetMixFormat(&pwfx);EXIT_ON_ERROR(hr)hr = pAudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED,0,hnsRequestedDuration,0,pwfx,NULL);EXIT_ON_ERROR(hr)// Get the size of the allocated buffer.hr = pAudioClient->GetBufferSize(&bufferFrameCount);EXIT_ON_ERROR(hr)hr = pAudioClient->GetService(IID_IAudioCaptureClient,(void**)&pCaptureClient);EXIT_ON_ERROR(hr)// Notify the audio sink which format to use.//hr = pMySink->SetFormat(pwfx);EXIT_ON_ERROR(hr)// Calculate the actual duration of the allocated buffer.hnsActualDuration = (double)REFTIMES_PER_SEC *bufferFrameCount / pwfx->nSamplesPerSec;hr = pAudioClient->Start(); // Start recording.EXIT_ON_ERROR(hr)// Each loop fills about half of the shared buffer.while (bDone == FALSE){// Sleep for half the buffer duration.Sleep(hnsActualDuration / REFTIMES_PER_MILLISEC / 2);hr = pCaptureClient->GetNextPacketSize(&packetLength);EXIT_ON_ERROR(hr)while (packetLength != 0){// Get the available data in the shared buffer.hr = pCaptureClient->GetBuffer(&pData,&numFramesAvailable,&flags, NULL, NULL);EXIT_ON_ERROR(hr)if (flags & AUDCLNT_BUFFERFLAGS_SILENT){pData = NULL; // Tell CopyData to write silence.}// Copy the available capture data to the audio sink.//hr = pMySink->CopyData(// pData, numFramesAvailable, &bDone);printf("size=%d\n", numFramesAvailable);EXIT_ON_ERROR(hr)hr = pCaptureClient->ReleaseBuffer(numFramesAvailable);EXIT_ON_ERROR(hr)hr = pCaptureClient->GetNextPacketSize(&packetLength);EXIT_ON_ERROR(hr)}}hr = pAudioClient->Stop(); // Stop recording.EXIT_ON_ERROR(hr)Exit:CoTaskMemFree(pwfx);SAFE_RELEASE(pEnumerator)SAFE_RELEASE(pDevice)SAFE_RELEASE(pAudioClient)SAFE_RELEASE(pCaptureClient)return hr;
}int main()
{RecordAudioStream();return 0;
}
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