int main(int argc, char *argv[])
{
int out;
const int bit=9;
char in_name[MAX_STR_LNGTH], out_name[MAX_STR_LNGTH];
short *wave;
short *new_wave;
unsigned int freq_in, bits_in;
unsigned int n_wave;
unsigned int i;
FILE *prt;
struct Waveheader header;
if ( (argc != 3) && (argc != 5) )
{
fprintf(stderr, "Usage: %s -i infile [-o outfile]\n", argv[0]);
exit(1);
}
else
{
strcpy(in_name, argv[2]);
out=0;
out_name[0]='\0';
if (argc == 5)
{
strcpy(out_name, argv[4]);
out=1;
}
}
fprintf(stderr,"infile: %s outfile: %s\n", in_name, out_name);
read_wave(&wave, &n_wave, &freq_in, &bits_in, in_name, &header);
// --------- 2.1 output curve to ascii file --------------
/*prt = fopen ("prt.txt","wt");
for(i=0 ; i<n_wave;i++){
fprintf(prt,"%i \n",wave[i]);
}
fclose(prt); */
// -------- 2.1 output curve to ascii file end ----------
// -------------- 2.4 downsampling ----------------------
/*for (i=0; i < n_wave / 2; i++){
wave[i] = wave[i*2];
}
freq_in /= 2;
n_wave /= 2;*/
// -------------- 2.4 downsampling end ------------------
// --------------3.2 bit reduction ----------------------
/*for (i =0; i < n_wave; i++){
wave[i] /= 512;
wave[i] *= 512;
}*/
// -------------- 3.2 bit reduction end -----------------
// -------------- 3.4 difference signal ------------------
new_wave = (short*)malloc(n_wave*sizeof(short));
for(i=0; i<n_wave; i++){
new_wave[i] = wave[i];
wave[i] /= pow(2.0,bit);
wave[i] *= pow(2.0,bit);
wave[i] -= new_wave[i];
wave[i] *= pow(2.0, 16-bit-1);
}
// -------------- 3.4 difference signal end --------------
if (out)
write_wave(wave, n_wave, freq_in, bits_in, out_name, &header);
free(wave);
return(1);
}
static void end_wave()
{
write_wave();
}