Audio

开发平台：

Visual C++

WaveOut.cpp：源码内容

							#include "stdafx.h"
#include "WaveOut.h"
#pragma comment(lib,"Winmm")
CWaveOut::CWaveOut()
{
	memset(&waveCaps,0,sizeof(waveCaps));
	bDevOpen = FALSE;
	m_hWave = 0;
	//----------
	nChannels = 1;
	dwHertZ = HERTZ_POOR;
	wBits = 16;
	//----------
	m_BufferQueue = 0;
}
CWaveOut::~CWaveOut()
{
	Stop();
}
BOOL CWaveOut::IsExistDevice()
{
	if( waveOutGetNumDevs() <= 0 )
	{
		return FALSE;
	}
	return TRUE;
}
WAVEOUTCAPS* CWaveOut::GetDeviceCap()
{
	MMRESULT mRet = waveOutGetDevCaps(WAVE_MAPPER,&waveCaps,sizeof(waveCaps));
	if( mRet == MMSYSERR_NOERROR )
		return &waveCaps;
	return NULL;
}
BOOL CWaveOut::Open()
{
	if( bDevOpen )
	{
		return FALSE;
	}
	MMRESULT mRet;
	WAVEFORMATEX wfx;
	wfx.wFormatTag = WAVE_FORMAT_PCM;
	wfx.nChannels = nChannels;
	wfx.nSamplesPerSec = dwHertZ;
	wfx.nAvgBytesPerSec = nChannels * dwHertZ * wBits / 8;
	wfx.nBlockAlign = wBits * nChannels / 8;
	wfx.wBitsPerSample = wBits;
	wfx.cbSize = 0;
	mRet = waveOutOpen(0,WAVE_MAPPER,&wfx,0,0,WAVE_FORMAT_QUERY);
	if( mRet != MMSYSERR_NOERROR )
	{
		return FALSE;
	}
	mRet = waveOutOpen(&m_hWave,WAVE_MAPPER,&wfx,(DWORD)waveOutProc,(DWORD)this,CALLBACK_FUNCTION);
	if( mRet != MMSYSERR_NOERROR )
	{
		return FALSE;
	}
	bDevOpen = TRUE;
	return TRUE;
}
void CWaveOut::Close()
{
	if (!bDevOpen)
	{
		return;
	}
	if(!m_hWave)
	{
		return;
	}
	waveOutReset(m_hWave);
	MMRESULT mRet = waveOutClose(m_hWave);
	if( mRet != MMSYSERR_NOERROR )
	{
		return;
	}
	m_hWave = 0;
	bDevOpen = FALSE;
}
void CALLBACK CWaveOut::waveOutProc(HWAVEOUT hwo,UINT uMsg,DWORD dwInstance,DWORD dwParam1,DWORD dwParam2)
{
	CWaveOut *pWaveOut;
	pWaveOut = (CWaveOut *)dwInstance;
	WAVEHDR* pWaveHead = NULL;
	switch(uMsg)
	{
	case WOM_OPEN:
		break;
	case WOM_CLOSE:
		break;
	case WOM_DONE:
		pWaveHead = (WAVEHDR*)dwParam1;
		if( pWaveHead != NULL )
		{
			waveOutUnprepareHeader(hwo,pWaveHead,sizeof(WAVEHDR));
			pWaveOut->SubBuffer();
			delete []pWaveHead->lpData;
			delete pWaveHead;
		}
		break;
	}
}
BOOL CWaveOut::Start()
{
	if( !Open() )
	{
		return FALSE;
	}
	return TRUE;
}
BOOL CWaveOut::Play(char* buf,UINT nSize)
{
	if( !bDevOpen )
	{
		return FALSE;
	}
	if( GetBufferNum() >= 5 )
	{
		return FALSE;
	}
	MMRESULT mRet;
	char*	lpData = NULL;
	WAVEHDR* pWaveHead = new WAVEHDR;
	ZeroMemory(pWaveHead,sizeof(WAVEHDR));
	lpData = new char[nSize];
	pWaveHead->dwBufferLength = nSize;
	memcpy(lpData,buf,nSize);
	pWaveHead->lpData = lpData;
	mRet = waveOutPrepareHeader(m_hWave,pWaveHead,sizeof(WAVEHDR));
  	if( mRet != MMSYSERR_NOERROR )
	{
		return FALSE;
	}
	mRet = waveOutWrite(m_hWave,pWaveHead,sizeof(WAVEHDR));
  	if( mRet != MMSYSERR_NOERROR )
	{
		return FALSE;
	}
	AddBuffer();
	return TRUE;
}
void CWaveOut::Stop()
{
	Close();
}

						