audioplay.cpp

一个VC实现的,用G.729a实现的语言对讲的例子

// AudioPlay.cpp: implementation of the CAudioPlay class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "RemoteTalk.h"
#include "AudioPlay.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

void waveOutErrorMsg(MMRESULT mmr,char* szTitle)
{
	char txt[MAXERRORLENGTH];
	waveOutGetErrorText(mmr,txt,MAXERRORLENGTH);
	MessageBox(0,txt,szTitle,MB_OK|MB_ICONWARNING);
}

CAudioPlay::CAudioPlay()
{
	m_mmr=0;
	m_hOut=0;
}

CAudioPlay::~CAudioPlay()
{
    Destroy();
}

//Alloc new buf,and delete it when done
BOOL CAudioPlay::Play(char *buf, UINT uSize)
{

	BOOL bRet=FALSE;
	char* p;
	LPWAVEHDR pwh=new WAVEHDR;
	if(!pwh)
		goto RET;
	p=new char[uSize];
	if(!p)
		goto RET;
	CopyMemory(p,buf,uSize);
	ZeroMemory(pwh,sizeof(WAVEHDR));
	pwh->dwBufferLength=uSize;
	pwh->lpData=p;
	m_mmr=waveOutPrepareHeader(m_hOut,pwh,sizeof(WAVEHDR));
    if(m_mmr)
		goto RET;
	m_mmr=waveOutWrite(m_hOut,pwh,sizeof(WAVEHDR));
	if(m_mmr)
		goto RET;
	bRet=TRUE;
	
	
RET:
	return bRet;
}

BOOL CAudioPlay::Create(WAVEFORMATEX *pwf,DWORD dwCallBack,DWORD dwInst,DWORD fdwOpen )
{
	BOOL bRet=FALSE;
	if(m_hOut)
	{
		bRet=TRUE;
		goto RET;
	}
	
	if(!OpenDev(pwf,dwCallBack,dwInst,fdwOpen))
		goto RET;
	bRet=TRUE;
RET:
	return bRet;
}

BOOL CAudioPlay::Destroy()
{
	BOOL bRet=FALSE;
	if(!CloseDev())
		goto RET;
	bRet=TRUE;
RET:
	return bRet;

}


CAudioPlay::operator HWAVEOUT() const
{
	return m_hOut;
}

MMRESULT CAudioPlay::GetLastMMError()
{
	return m_mmr;
}

void CAudioPlay::SetLastMMError(MMRESULT mmr)
{
	m_mmr=mmr;
}

BOOL CAudioPlay::CloseDev()
{
	BOOL bRet=FALSE;
	if(!m_hOut)
		goto RET;
	m_mmr=waveOutReset(m_hOut);
	if(m_mmr)
		goto RET;
	m_mmr=waveOutClose(m_hOut);
	if(m_mmr)
		goto RET;
	m_hOut=0;
	bRet=TRUE;
RET:
	return bRet;
}

BOOL CAudioPlay::OpenDev(WAVEFORMATEX* pfmt,DWORD dwCallback,DWORD dwCallbackInstance,DWORD fdwOpen)
{
	BOOL bRet=FALSE;
	WAVEFORMATEX wf;
	if(!pfmt)
	{
		
		wf.wFormatTag	= WAVE_FORMAT_PCM;
		wf.cbSize		= 0;
		wf.wBitsPerSample=16;
		wf.nSamplesPerSec=8000;
		wf.nChannels=1;
		wf.nAvgBytesPerSec	= wf.nSamplesPerSec*(wf.wBitsPerSample/8);
		wf.nBlockAlign		= wf.nChannels     *(wf.wBitsPerSample/8);
		pfmt=&wf;
	}
	MMRESULT mmr;
	mmr=waveOutOpen(0,WAVE_MAPPER,pfmt,0,0,WAVE_FORMAT_QUERY);
	if(mmr)
	{
		SetLastMMError(mmr);
		goto RET;
	}
	mmr=waveOutOpen(&m_hOut,WAVE_MAPPER,pfmt,dwCallback,dwCallbackInstance,fdwOpen);
	if(mmr)
	{
		
		
		SetLastMMError(mmr);
		goto RET;
	}
	bRet=TRUE;
RET:
	return bRet;
}