EasyPlayerPro-win本地音频采集实现

需求

在安防行业应用中，除了在本地看到摄像机的视频和进行音频监听外，还有一个重要的功能，那就是对讲. EasyPlayerPro-win为了减轻二次开发者的工作量，将本地音频采集也进行了集成.

功能特点

支持获取本地所有音频输入设备列表;
可任意选择任一音频输入设备;
可设置采样率和采样精度及位率;
可设置编码格式(当前支持G711A,G711U,AAC);

实现流程

采用DirectSound8进行本地音频采集;
将采集到的音频数据写入编码队列;
在编码线程中获取源始音频数据，进行音频编码;
编码完成后，将编码数据回调给上层应用;

//获取声音采集设备列表int     GetAudioCaptureDeviceList(int *num, SOUND_CAPTURE_DEVICE_INFO **pDeviceInfo);int     OpenAudioCaptureDevice(int captureDeviceIndex);int     GetSupportWaveFormatList(int *num, WAVEFORMATEX **ppWaveFormatEx);int     StartCapture(int waveFormatExIndex, DirectSoundCaptureCallback callback, void *userptr);int     StopCapture();void    CloseAudioCaptureDevice();static LPTHREAD_START_ROUTINE __stdcall _lpDirectSoundCaptureThread ( LPVOID _pParam );

代码实现

//开始采集音频int     DirectSoundCapturer::StartCapture(int waveFormatExIndex, DirectSoundCaptureCallback callback, void *userptr){if (NULL == pSoundCaptureThread)        return -1;if (NULL == pSoundCaptureThread->pSupportWaveFormatEx)      return -1;if (waveFormatExIndex< 0 || waveFormatExIndex>=pSoundCaptureThread->supportWaveFormatExCount)   return -2;HRESULT hr = S_OK;WAVEFORMATEX *_wfxInput = (WAVEFORMATEX*)&pSoundCaptureThread->pSupportWaveFormatEx[waveFormatExIndex];memcpy(&pSoundCaptureThread->inWaveFormatEx, _wfxInput, sizeof(WAVEFORMATEX));DSCBUFFERDESC   dscbd;ZeroMemory( &dscbd, sizeof(DSCBUFFERDESC) );pSoundCaptureThread->dwNotifySize  = max( 1024, _wfxInput->nAvgBytesPerSec / 8 );pSoundCaptureThread->dwNotifySize -= pSoundCaptureThread->dwNotifySize % _wfxInput->nBlockAlign;pSoundCaptureThread->dwCaptureBufferSize = pSoundCaptureThread->dwNotifySize * 16;dscbd.dwSize        = sizeof(DSCBUFFERDESC);dscbd.dwBufferBytes = pSoundCaptureThread->dwCaptureBufferSize;dscbd.lpwfxFormat   = _wfxInput;hr = pSoundCaptureThread->lpDirectSoundCapture8->CreateCaptureBuffer( &dscbd, &pSoundCaptureThread->lpDSBCapture, NULL);if (FAILED(hr))                                 return -3;if (NULL == pSoundCaptureThread->lpDSBCapture)  return -4;pSoundCaptureThread->dwNextCaptureOffset = 0;hr = pSoundCaptureThread->lpDSBCapture->QueryInterface( IID_IDirectSoundNotify, (PVOID*)&pSoundCaptureThread->lpDSNotify );for( INT i = 0; i < 16; i++ ) {    pSoundCaptureThread->DSBPosNotify[i].dwOffset     = (pSoundCaptureThread->dwNotifySize * i) + pSoundCaptureThread->dwNotifySize - 1;    pSoundCaptureThread->DSBPosNotify[i].hEventNotify = pSoundCaptureThread->hCaptureNotifyEvent;}hr = pSoundCaptureThread->lpDSNotify->SetNotificationPositions( 16, pSoundCaptureThread->DSBPosNotify);hr = pSoundCaptureThread->lpDSBCapture->Start( DSCBSTART_LOOPING );//m_fIsCapture = TRUE;if (SUCCEEDED(hr)){    if (NULL == pSoundCaptureThread->hCaptureNotifyThread)    {        pSoundCaptureThread->flag = 0x01;        pSoundCaptureThread->userPtr = this;        pSoundCaptureThread->captureCallback = callback;        pSoundCaptureThread->callbackUserPtr = userptr;        pSoundCaptureThread->hCaptureNotifyThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)_lpDirectSoundCaptureThread,             pSoundCaptureThread, 0, NULL);        while (pSoundCaptureThread->flag!=0x02 && pSoundCaptureThread->flag!=0x00)  {Sleep(100);}    }}return hr;}//获取源始音频数据int DirectSoundCapturer::ProcessCaptureData(){HRESULT hrRet = 0;LONG    lLockSize;if (NULL == pSoundCaptureThread)            return -1;if (pSoundCaptureThread->flag == 0x03)      return -1;if (NULL == pSoundCaptureThread->lpDSBCapture)  return -1;do {    DWORD   dwCapturePos, dwReadPos;    hrRet = pSoundCaptureThread->lpDSBCapture->GetCurrentPosition( &dwCapturePos, &dwReadPos );    lLockSize = dwReadPos - pSoundCaptureThread->dwNextCaptureOffset;    if( lLockSize < 0 ) lLockSize += pSoundCaptureThread->dwCaptureBufferSize;    // Block align lock size so that we are always write on a boundary    lLockSize -= (lLockSize % pSoundCaptureThread->dwNotifySize);    if( lLockSize == 0 ) {        hrRet = -1;        break;    }    PVOID   pCapturedData[2]   = {NULL, NULL};    DWORD   dwCaptureLength[2] = {0, 0};    // Lock the capture buffer down    hrRet = pSoundCaptureThread->lpDSBCapture->Lock( pSoundCaptureThread->dwNextCaptureOffset,                                 lLockSize,                                  &pCapturedData[0],                                 &dwCaptureLength[0],                                 &pCapturedData[1],                                 &dwCaptureLength[1], 0L );    if( FAILED( hrRet ) ) {        hrRet = -2;        break;    }    if (NULL != pSoundCaptureThread->captureCallback)    {        pSoundCaptureThread->captureCallback(&pSoundCaptureThread->inWaveFormatEx, pSoundCaptureThread->callbackUserPtr,            (unsigned char *)pCapturedData[0], (int)dwCaptureLength[0], (unsigned char *)pCapturedData[1], (int)dwCaptureLength[1]);    }    pSoundCaptureThread->dwNextCaptureOffset += dwCaptureLength[0];    pSoundCaptureThread->dwNextCaptureOffset %= pSoundCaptureThread->dwCaptureBufferSize;       // Circular buffer    if( pCapturedData[1] != NULL ) {        pSoundCaptureThread->dwNextCaptureOffset += dwCaptureLength[1];        pSoundCaptureThread->dwNextCaptureOffset %= pSoundCaptureThread->dwCaptureBufferSize; // Circular buffer    }    pSoundCaptureThread->lpDSBCapture->Unlock( pCapturedData[0], dwCaptureLength[0],                           pCapturedData[1], dwCaptureLength[1] );} while(0);return hrRet;}

关于EasyPlayerPro

EasyPlayerPro是一款全功能的流媒体播放器，支持RTSP、RTMP、HTTP、HLS、UDP、RTP、File等多种流媒体协议播放、支持本地文件播放，支持本地抓拍、本地录像、播放旋转、多屏播放、倍数播放等多种功能特性，核心基于ffmpeg，稳定、高效、可靠、可控，支持Windows、Android、iOS三个平台，目前在多家教育、安防、行业型公司，都得到的应用，广受好评！

EasyPlayerPro：https://github.com/EasyDSS/EasyPlayerPro

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