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::Proce*tureData()
{
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播放器
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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