waveout.h

截取wave通过g.729在网上压缩传输

#ifndef _WAVEOUT_H_
#define _WAVEOUT_H_

#define HERTZ_POOR		8000
#define HERTZ_LOW		11025
#define HERTZ_NORMAL	22050
#define HERTZ_HIGH		44100

#define PLAY_DELAY 5

#include <mmsystem.h>
#include <afxmt.h>

//音频输出(播放数字音频)-将音频数据在硬件上进行播放
class CWaveOut
{
private:
	static void CALLBACK waveOutProc(HWAVEOUT hwo,UINT uMsg,DWORD dwInstance,DWORD dwParam1,DWORD dwParam2);

private:
	WAVEOUTCAPS	waveCaps;
	BOOL		bDevOpen;
	HWAVEOUT	m_hWave;

private:
    WORD		nChannels; 
    DWORD		dwHertZ; 
    WORD		wBits;

private:
	CCriticalSection	m_Lock;
	int			m_BufferQueue;

	inline int GetBufferNum();
	inline void AddBuffer();
	inline void SubBuffer();

private:
	BOOL Open();
	void Close();

public:
	CWaveOut();
	~CWaveOut();

//check
public:
	BOOL IsExistDevice();
	WAVEOUTCAPS* GetDeviceCap();

//setting
public:
	enum CHANNEL { SINGLE ,  STEREO };
	inline void SetChannel(CHANNEL Channel);
	inline void SetHertZ(DWORD HertZ);
	inline void SetBit(WORD Bits);

//operation
public:
	BOOL Start();
	BOOL Play(char* buf,UINT nSize);
	void Stop();
};

inline void CWaveOut::SetChannel(CHANNEL Channel)
{
	switch( Channel )
	{
	case SINGLE:
		nChannels = 1;
		break;
	case STEREO:
		nChannels = 2;
		break;
	}
}

inline void CWaveOut::SetHertZ(DWORD HertZ)
{
	dwHertZ = HertZ;
}

inline void CWaveOut::SetBit(WORD Bits)
{
	wBits = Bits;
}

inline int CWaveOut::GetBufferNum()
{
	int nRet = 5;
	m_Lock.Lock();
	nRet = m_BufferQueue;
	m_Lock.Unlock();
	return nRet;
}

inline void CWaveOut::AddBuffer()
{
	m_Lock.Lock();
	m_BufferQueue++;
	m_Lock.Unlock();
}

inline void CWaveOut::SubBuffer()
{
	m_Lock.Lock();
	m_BufferQueue--;
	m_Lock.Unlock();
}

#endif