www.pudn.com > AudioCodec.rar > AcmCodec.h

// AcmCodec.h: interface for the CAcmCodec class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#if !defined(AFX_ACMCODEC_H__83295DE1_D443_11D3_8BEA_5254AB148BCA__INCLUDED_) 
#define AFX_ACMCODEC_H__83295DE1_D443_11D3_8BEA_5254AB148BCA__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
 
#define ACM_CODEC_PASS			0	// pass without codec 
#define ACM_CODEC_ALAW			1 
#define ACM_CODEC_MULAW			2 
#define ACM_CODEC_ADPCM			3	// "Microsoft ADPCM"; 
#define ACM_CODEC_GSM610		4 
#define ACM_CODEC_G729CP		5 
#define ACM_CODEC_G723_1		6 
#define ACM_CODEC_ILBC			7 
 
#define WAVE_FORMAT_GFDVR	WAVE_FORMAT_DEVELOPMENT 
 
class CAcmCodec   
{ 
public: 
	CAcmCodec(); 
	virtual ~CAcmCodec(); 
 
	// ACM_CODEC_XXXX types 
	// Set encode or decode flag in bEncode 
	// Set the (byte) data length in iLength 
	BOOL Init(int iType, BOOL bEncode);	 
	BOOL Init(WAVEFORMATEX * pWfx, int iFormatSize, BOOL bEncode); 
	void Free(); 
 
	// return encoded length, iData is always 16 bits, 8k sampling pcm data 
	int Encode(char * pData, char * pCode, int iLength); 
	int Decode(char * pData, char * pCode, int iLength); 
 
	// return coded length, if error occurs, return -1 
	int GetMaxCodeLength(int iSrcLength); 
 
	inline void SetRawSampleRate(int iSampleRate)	{	m_iRawSampleRate = iSampleRate;	} 
	inline void SetRawChannels(int iChannels )		{	m_iRawChannels = iChannels;		} 
	WAVEFORMATEX * GetRawFormat()					{	return &m_wfxRaw;				} 
 
protected: 
	BOOL SetFormat(int iType); 
	void SetRawFormat(); 
	BOOL NeedConvert(WAVEFORMATEX * pWfx); 
	int Convert(unsigned char * pSrc, unsigned char * pDst); 
	BOOL PrepareHeader(unsigned char * pSrc, unsigned char * pDst); 
 
	int GetMaxFormatSize(); 
	BOOL OpenStream(BOOL bEncode); 
	BOOL GetStreamSize(int iLength); 
 
protected: 
	HACMSTREAM		m_has;   
	ACMSTREAMHEADER m_asHeader; 
	WAVEFORMATEX *	m_pwfxCode; 
	WAVEFORMATEX	m_wfxRaw; 
 
	DWORD m_dwDstLength; 
	DWORD m_dwSrcLength; 
 
	BOOL m_bPass; 
	 
	int m_iRawSampleRate; 
	int m_iRawChannels; 
 
}; 
 
#endif // !defined(AFX_ACMCODEC_H__83295DE1_D443_11D3_8BEA_5254AB148BCA__INCLUDED_)