adpcm.h

基于TI xdais算法标准的音频ADPCM算法

/*
 *  ======== adpcm.h ========
 *
 *  Header file for adpcm.c
 *  
 */
 
#ifndef ADPCM_H
#define ADPCM_H


typedef struct  
{ 
  short	valprev;	/* Previous output value */
  char	index;		/* Index into stepsize table */
}AdpcmState;

#define ADPCMSTATE_INITVAL{	\
	0,						\
	0						\
}
extern void encode(short *indata, char *outdata, int len,  AdpcmState *state);
extern void decode(char *indata, short *outdata, int len,  AdpcmState *state);

#endif