利用directsound播放PCM流的封装类(3)

TAG:

(FAILED(m_pDSBuf->Lock( m_dwNextPlayOffset, lLockSize,

&pvStreamData1, &dwStreamLength1,

&pvStreamData2, &dwStreamLength2, 0L)))

return FALSE;

// read in the data

if(m_stream_handler) m_stream_handler->AdoStreamData(

(BYTE *)pvStreamData1, dwStreamLength1) ;

// Move the capture offset along

m_dwNextPlayOffset += dwStreamLength1;

m_dwNextPlayOffset %= m_dwPlayBufSize; // Circular buffer

if(pvStreamData2 != NULL) {

if(m_stream_handler) m_stream_handler->AdoStreamData(

(BYTE *)pvStreamData2, dwStreamLength2) ;

// Move the capture offset along

m_dwNextPlayOffset += dwStreamLength2;

m_dwNextPlayOffset %= m_dwPlayBufSize; // Circular buffer

}

// unlock it

m_pDSBuf->Unlock(pvStreamData1, dwStreamLength1, pvStreamData2, dwStreamLength2) ;

// return a success

return TRUE;

}

BOOL CStreamAudio::CtrlStream(BOOL bPlaying)

{

HRESULT hr ;

int i;

m_bPlaying = bPlaying ;

if(m_bPlaying) {

// Create a 2 second buffer to stream in wave

m_pDSBuf = CreateStreamBuffer(m_pDS, &m_wfxOutput) ;

if(m_pDSBuf == NULL) return FALSE ;

// Create the notification interface

if(FAILED(m_pDSBuf->QueryInterface(IID_IDirectSoundNotify8, (void**)(&m_pDSNotify))))

return FALSE ;

// create auto notify event

m_hNotifyEvent = CreateEvent( NULL, FALSE, FALSE, NULL );

// Setup the notification positions

for( i = 0; i < NUM_REC_NOTIFICATIONS; i++ ) {

m_aPosNotify[i].dwOffset = (m_dwNotifySize * i) + m_dwNotifySize - 1;

m_aPosNotify[i].hEventNotify = m_hNotifyEvent;

}

// Tell DirectSound when to notify us. the notification will come in the from

// of signaled events that are handled in WinMain()

if( FAILED( hr = m_pDSNotify->SetNotificationPositions(

NUM_REC_NOTIFICATIONS, m_aPosNotify ) ) )

return S_FALSE ;

m_dwNextPlayOffset = 0 ;

// Fill buffer with some sound

LoadStreamData() ;

// Play sound looping

m_pDSBuf->SetCurrentPosition(0);

m_pDSBuf->SetVolume(DSBVOLUME_MAX);

m_pDSBuf->Play(0,0,DSBPLAY_LOOPING);

// create notify event recv thread

AfxBeginThread(CStreamAudio::notify_stream_thd, (LPVOID)(this)) ;

} else {

// stop play

// make sure the thread gone

Sleep(500) ;

// stop sound play

if(m_pDSBuf) m_pDSBuf->Stop();

// Release the notify event handles

if(m_hNotifyEvent) {

CloseHandle(m_hNotifyEvent) ;

m_hNotifyEvent = NULL ;

}

// Release DirectSound objects

SAFE_RELEASE(m_pDSBuf) ;

}

return TRUE ;

}

BOOL CStreamAudio::SetWavFormat(WAVEFORMATEX * wfx)

{

// get the default capture wave formate

ZeroMemory(wfx, sizeof(WAVEFORMATEX)) ;

wfx->wFormatTag = WAVE_FORMAT_PCM;

// 8KHz, 16 bits PCM, Mono

wfx->nSamplesPerSec = 8000 ;

wfx->wBitsPerSample = 16 ;

wfx->nChannels = 1 ;

wfx->nBlockAlign = wfx->nChannels * ( wfx->wBitsPerSample / 8 ) ;

wfx->nAvgBytesPerSec = wfx->nBlockAlign * wfx->nSamplesPerSec;

return TRUE ;

}

(陈罡)

C++ 采集音频流(PCM裸流)实现录音功能	C++ 播放音频流(PCM裸流)
AEC滤波系统	winxp平台的内置AEC(回声消除)和噪声抑制
CreateSoundBuffer()失败问题	IDirectSoundBuffer::SetVolume的参数与音量分贝的函数关系
wav pcm wave 文件音量增大算法	PCM文件格式
杜比、DTS、PCM、AC-3、THX、SDDS音效全接触	DirectAudio

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利用directsound播放PCM流的封装类(3)