main.h

该源码是对 *.wav语音波形文件做去直流电平

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;  // 前一次转换时的数据
	int  index;  // 前一此转换时使用的索引
	int  Length;     // 转换数据长度
	int* pBufferIn;  // 输入缓冲区地址
	int* pBufferOut; // 输出缓冲区地址

}adpcm_state;