void adpcm_coder(short *indata,  char *outdata, int len,struct adpcm_state state);

void adpcm_decoder( char *indata, short *outdata, int len, struct adpcm_state state);

int fun_SampleAverage(short *Pinput);   

void fun_Normalize(short* input,short*output,int length);


struct adpcm_state
{
	int  valprev;  // 前一次轉(zhuǎn)換時的數(shù)據(jù)
	int  index;  // 前一此轉(zhuǎn)換時使用的索引
	int  Length;     // 轉(zhuǎn)換數(shù)據(jù)長度
	int* pBufferIn;  // 輸入緩沖區(qū)地址
	int* pBufferOut; // 輸出緩沖區(qū)地址

}adpcm_state;