www.pudn.com > speakFreely-code.zip > ADPCM_U.H

/* 
** 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 */ 
}; 
 
extern void adpcm_coder_u(unsigned char[], char[], int, struct adpcm_state *); 
extern void adpcm_decoder_u(char[], unsigned char[], int, struct adpcm_state *);