adpcm.h

G.726 ADPCM算法在C语言上的实现代码

/* 
** adpcm.h - include file for adpcm coder. 
** 
** Version 1.0, 7-Jul-92. 
*/ 
 
struct adpcm_state { 
    short      valprev;        /* Previous output value */ 
    char       index;          /* Index into stepsize table */ 
}; 
 
void adpcm_coder (short [], char [], long, struct adpcm_state *); 
void adpcm_decoder (char [], short [], int, struct adpcm_state *);