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/**********************************************************************
compareresample.c
Real-time library interface by Dominic Mazzoni
Based on resample-1.7:
http://www-ccrma.stanford.edu/~jos/resample/
License: LGPL - see the file LICENSE.txt for more information
**********************************************************************/
#include "../include/libresample.h"
#include <samplerate.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <sys/time.h>
#define MIN(A, B) (A) < (B)? (A) : (B)
void dostat(char *name, float *d1, float *d2, int len)
{
int i;
double sum, sumsq, err, rmserr;
sum = 0.0;
sumsq = 0.0;
for(i=0; i<len; i++) {
double diff = d1[i] - d2[i];
sum += fabs(diff);
sumsq += diff * diff;
}
err = sum / len;
rmserr = sqrt(sumsq / len);
printf(" %s: Avg err: %f RMS err: %f\n", name, err, rmserr);
}
void runtest(float *src, int srclen,
float *ans, int anslen,
double factor)
{
struct timeval tv0, tv1;
int dstlen = (int)(srclen * factor);
float *dst_rs = (float *)malloc((dstlen+100) * sizeof(float));
float *dst_rabbit = (float *)malloc((dstlen+100) * sizeof(float));
void *handle;
SRC_DATA rabbit;
double deltat;
int srcblocksize = srclen;
int dstblocksize = dstlen;
int i, out, out_rabbit, o, srcused;
int statlen, srcpos;
/* do resample */
for(i=0; i<dstlen+100; i++)
dst_rs[i] = -99.0;
gettimeofday(&tv0, NULL);
handle = resample_open(1, factor, factor);
out = 0;
srcpos = 0;
for(;;) {
int srcBlock = MIN(srclen-srcpos, srcblocksize);
int lastFlag = (srcBlock == srclen-srcpos);
o = resample_process(handle, factor,
&src[srcpos], srcBlock,
lastFlag, &srcused,
&dst_rs[out], MIN(dstlen-out, dstblocksize));
srcpos += srcused;
if (o >= 0)
out += o;
if (o < 0 || (o == 0 && srcpos == srclen))
break;
}
resample_close(handle);
gettimeofday(&tv1, NULL);
deltat =
(tv1.tv_sec + tv1.tv_usec * 0.000001) -
(tv0.tv_sec + tv0.tv_usec * 0.000001);
if (o < 0) {
printf("Error: resample_process returned an error: %d\n", o);
}
if (out <= 0) {
printf("Error: resample_process returned %d samples\n", out);
free(dst_rs);
return;
}
printf(" resample: %.3f seconds, %d outputs\n", deltat, out);
/* do rabbit (Erik's libsamplerate) */
for(i=0; i<dstlen+100; i++)
dst_rabbit[i] = -99.0;
rabbit.data_in = src;
rabbit.data_out = dst_rabbit;
rabbit.input_frames = srclen;
rabbit.output_frames = dstlen;
rabbit.input_frames_used = 0;
rabbit.output_frames_gen = 0;
rabbit.end_of_input = 1;
rabbit.src_ratio = factor;
gettimeofday(&tv0, NULL);
/* src_simple(&rabbit, SRC_SINC_BEST_QUALITY, 1); */
src_simple(&rabbit, SRC_SINC_FASTEST, 1);
/* src_simple(&rabbit, SRC_LINEAR, 1); */
gettimeofday(&tv1, NULL);
deltat =
(tv1.tv_sec + tv1.tv_usec * 0.000001) -
(tv0.tv_sec + tv0.tv_usec * 0.000001);
out_rabbit = rabbit.output_frames_gen;
printf(" rabbit : %.3f seconds, %d outputs\n",
deltat, out_rabbit);
statlen = MIN(out, out_rabbit);
if (anslen > 0)
statlen = MIN(statlen, anslen);
if (ans) {
dostat("resample ", dst_rs, ans, statlen);
dostat("rabbit ", dst_rabbit, ans, statlen);
}
dostat( "RS vs rabbit", dst_rs, dst_rabbit, statlen);
free(dst_rs);
free(dst_rabbit);
}
int main(int argc, char **argv)
{
int i, srclen;
float *src, *ans;
printf("\n*** sin wave, factor = 1.0 *** \n\n");
srclen = 100000;
src = malloc(srclen * sizeof(float));
for(i=0; i<srclen; i++)
src[i] = sin(i/100.0);
runtest(src, srclen, src, srclen, 1.0);
printf("\n*** sin wave, factor = 0.25 *** \n\n");
srclen = 100000;
for(i=0; i<srclen; i++)
src[i] = sin(i/100.0);
ans = malloc((srclen/4) * sizeof(float));
for(i=0; i<srclen/4; i++)
ans[i] = sin(i/25.0);
runtest(src, srclen, ans, srclen/4, 0.25);
free(ans);
printf("\n*** sin wave, factor = 4.0 *** \n\n");
srclen = 20000;
for(i=0; i<srclen; i++)
src[i] = sin(i/100.0);
ans = malloc((srclen*4) * sizeof(float));
for(i=0; i<srclen*4; i++)
ans[i] = sin(i/400.0);
runtest(src, srclen, ans, srclen*4, 4.0);
free(ans);
free(src);
return 0;
}
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