www.pudn.com > Voice_ADPCM.rar > SGICAUDI.C

/* 
** sgicaudio - Simple AIFF file compressor. 
** 
** Needs libaf, which is in the Digital Media developers option. 
*/ 
 
#include  
#include  
#include  
#include "adpcm.h" 
 
#define NFRAMES 8000 
 
struct adpcm_state astate; 
short ibuf[NFRAMES]; 
char obuf[NFRAMES/2]; 
 
main(argc, argv) 
    int argc; 
    char **argv; 
{ 
    AFfilehandle af; 
    FILE *of; 
    long fmt, width; 
    long count; 
     
    if ( argc < 2 || argc > 3 ) { 
	fprintf(stderr, "Usage: %s aifffile [adpcmfile]\n", argv[0]); 
	exit(1); 
    } 
    /* 
    ** Open input file and check format 
    */ 
    if ( (af = AFopenfile(argv[1], "r", NULL)) == 0 ) { 
	perror(argv[1]); 
	exit(1); 
    } 
    AFgetsampfmt(af, AF_DEFAULT_TRACK, &fmt, &width); 
    if ( AFgetchannels(af, AF_DEFAULT_TRACK) != 1 || fmt != AF_SAMPFMT_TWOSCOMP 
	|| width != 16 ) { 
	fprintf(stderr, "%s: %s: only 16bit mono integer files supported\n", 
		argv[0], argv[1]); 
	exit(1); 
    } 
    if ( AFgetrate(af, AF_DEFAULT_TRACK) != 8000.0 ) 
      fprintf(stderr, "%s: %s: WARNING: not 8Khz\n", argv[0], argv[1]); 
    /* 
    ** Open output file 
    */ 
    if ( argc == 3 ) { 
	if ( (of=fopen(argv[2], "w")) == 0 ) { 
	    perror(argv[2]); 
	    exit(1); 
	} 
    } else { 
	of = stdout; 
    } 
    /* 
    ** Copy loop 
    */ 
    while (1) { 
	count = AFreadframes(af, AF_DEFAULT_TRACK, ibuf, NFRAMES); 
	if ( count <= 0 ) break; 
	if ( count & 1 ) { 
	    ibuf[count] = ibuf[count-1]; 
	    count++; 
	} 
	adpcm_coder(ibuf, obuf, count, &astate); 
	fwrite(obuf, 1, (count+1)/2, of); 
    } 
    fclose(of); 
    AFclosefile(af); 
    exit(0); 
}