testc.c

G.726 ADPCM算法在C语言上的实现代码

/* testc - Test adpcm coder */   
   
#include "adpcm.h"    
#include <STDIO.H>    
#include <STDLIB.H>    
#include <STRING.H>    
#include <DOS.H>    
   
struct adpcm_state state;   
   
#define NSAMPLES 1000    
   
char   abuf[NSAMPLES/2];   
short  sbuf[NSAMPLES];   
   
main() {   
    FILE    *f, *f2;   
    char    fname[64],fname2[64];   
   
    if (_argc < 3 )   
    {   
        printf("Usage: %s infile outfile\r\n", _argv[0]);   
        exit(1);   
    }   
    strcpy(fname,_argv[1]);   
    strcpy(fname2,_argv[2]);   
   
    if ( NULL == (f2=fopen(fname2,"wb")) )   
    {   
        printf("Error opening '%s', terminating..\r\n", fname2);   
        exit(4);   
    }   
    if ( NULL == (f=fopen(fname,"rb")) )   
    {   
        printf("Error opening '%s', terminating..\r\n", fname);   
        exit(4);   
    }   
    while( fread(&sbuf,sizeof(sbuf),1,f) )   
    {   
        adpcm_coder(sbuf, abuf, sizeof(sbuf)/2, &state);   
        fwrite(&abuf,sizeof(abuf),1,f2);   
    }   
    fclose(f);   
    fclose(f2);   
    printf("Final valprev=%d, index=%d\r\n",   
           state.valprev, state.index);   
    exit(0);   
}