#pragma once

//wav头的结构如下所示：
typedef   struct  __WAV_HEADER{   
	char         fccID[4];       /*   should   be   "RIFF"   */   
	unsigned   long       dwSize;           /*   byte_number   behind   it   */   
	char         fccType[4];   /*   should   be   "WAVE"   */   
}HEADER;   

typedef   struct   __WAV_FMT{   
	char         fccID[4];       /*   should   be   "fmt   "   */   
	unsigned   long       dwSize;           /*   should   be   0x10   */   
	unsigned   short     wFormatTag;   /*   should   be   1   */   
	unsigned   short     wChannels;    //| 声道数目，1--单声道；2--双声道       |     |
	unsigned   long       dwSamplesPerSec;   //采样频率 
	unsigned   long       dwAvgBytesPerSec;  //每秒所需字节数 
	unsigned   short     wBlockAlign;		 //数据块对齐单位(每个采样需要的字节数)
	unsigned   short     uiBitsPerSample;    //每个采样需要的bit数  
	//unsigned   char     ExInfo[2];			 //附加信息（可选，通过Size来判断有无）	
}FMT;   

typedef   struct  __WAV_DATA{   
	char         fccID[4];         /*   should   be   "data"   */   
	unsigned   long       dwSize;             /*   byte_number   of   PCM   data   in   byte*/   
}DATA;  

typedef struct{
	DWORD dwRIFF;
	DWORD dwFileLen;
	DWORD dwWAVE;
	DWORD dw_fmt;
	DWORD dwFmtLen;
	WORD  wDataType;
	WORD  wNChannels;
	DWORD dwSamplingRate;
	DWORD dwNBytesPerSec;
	WORD  wAlignment;
	WORD  wNBitsPerSam;
	DWORD dwdata;
	DWORD dwDataLen;
}WAVEHEADER;

extern int PcmToALow(char *pSrcFileName, char *pDescFileName);