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/**********************************************************************
resample-sndfile.c
Written 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 <sndfile.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <sys/time.h>
#define MIN(A, B) (A) < (B)? (A) : (B)
void usage(char *progname)
{
fprintf(stderr, "Usage: %s -by <ratio> <input> <output>\n", progname);
fprintf(stderr, " %s -to <rate> <input> <output>\n", progname);
fprintf(stderr, "\n");
exit(-1);
}
int main(int argc, char **argv)
{
SNDFILE *srcfile, *dstfile;
SF_INFO srcinfo, dstinfo;
SF_FORMAT_INFO formatinfo;
char *extension;
void **handle;
int channels;
int srclen, dstlen;
float *src, *srci;
float *dst, *dsti;
double ratio = 0.0;
double srcrate;
double dstrate = 0.0;
struct timeval tv0, tv1;
double deltat;
int numformats;
int pos, bufferpos, outcount;
int i, c;
if (argc != 5)
usage(argv[0]);
if (!strcmp(argv[1], "-by")) {
ratio = atof(argv[2]);
if (ratio <= 0.0) {
fprintf(stderr, "Ratio of %f is illegal\n", ratio);
usage(argv[0]);
}
}
else if (!strcmp(argv[1], "-to")) {
dstrate = atof(argv[2]);
if (dstrate < 10.0 || dstrate > 100000.0) {
fprintf(stderr, "Sample rate of %f is illegal\n", dstrate);
usage(argv[0]);
}
}
else
usage(argv[0]);
memset(&srcinfo, 0, sizeof(srcinfo));
memset(&dstinfo, 0, sizeof(dstinfo));
srcfile = sf_open(argv[3], SFM_READ, &srcinfo);
if (!srcfile) {
fprintf(stderr, "%s", sf_strerror(NULL));
exit(-1);
}
srcrate = srcinfo.samplerate;
if (dstrate == 0.0)
dstrate = srcrate * ratio;
else
ratio = dstrate / srcrate;
channels = srcinfo.channels;
/* figure out format of destination file */
extension = strstr(argv[4], ".");
if (extension) {
extension++;
sf_command(NULL, SFC_GET_FORMAT_MAJOR_COUNT,
&numformats, sizeof(numformats));
for(i=0; i<numformats; i++) {
memset(&formatinfo, 0, sizeof(formatinfo));
formatinfo.format = i;
sf_command(NULL, SFC_GET_FORMAT_MAJOR,
&formatinfo, sizeof(formatinfo));
if (!strcmp(formatinfo.extension, extension)) {
printf("Using %s for output format.\n", formatinfo.name);
dstinfo.format = formatinfo.format |
(srcinfo.format & SF_FORMAT_SUBMASK);
break;
}
}
}
if (!dstinfo.format) {
if (extension)
printf("Warning: output format (%s) not recognized, "
"using same as input format.\n",
extension);
dstinfo.format = srcinfo.format;
}
dstinfo.samplerate = (int)(dstrate + 0.5);
dstinfo.channels = channels;
dstfile = sf_open(argv[4], SFM_WRITE, &dstinfo);
if (!dstfile) {
fprintf(stderr, "%s", sf_strerror(NULL));
exit(-1);
}
printf("Source: %s (%d frames, %.2f Hz)\n",
argv[3], (int)srcinfo.frames, srcrate);
printf("Destination: %s (%.2f Hz, ratio=%.5f)\n", argv[4],
dstrate, ratio);
srclen = 4096;
dstlen = (srclen * ratio + 1000);
srci = (float *)malloc(srclen * channels * sizeof(float));
dsti = (float *)malloc(dstlen * channels * sizeof(float));
src = (float *)malloc(srclen * sizeof(float));
dst = (float *)malloc(dstlen * sizeof(float));
handle = (void **)malloc(channels * sizeof(void *));
for(c=0; c<channels; c++)
handle[c] = resample_open(1, ratio, ratio);
gettimeofday(&tv0, NULL);
pos = 0;
bufferpos = 0;
outcount = 0;
while(pos < srcinfo.frames) {
int block = MIN(srclen-bufferpos, srcinfo.frames-pos);
int lastFlag = (pos+block == srcinfo.frames);
int inUsed, inUsed2=0, out=0, out2=0;
sf_readf_float(srcfile, &srci[bufferpos*channels], block);
block += bufferpos;
for(c=0; c<channels; c++) {
for(i=0; i<block; i++)
src[i] = srci[i*channels+c];
inUsed = 0;
out = resample_process(handle[c], ratio, src, block, lastFlag,
&inUsed, dst, dstlen);
if (c==0) {
inUsed2 = inUsed;
out2 = out;
}
else {
if (inUsed2 != inUsed || out2 != out) {
fprintf(stderr, "Fatal error: channels out of sync!\n");
exit(-1);
}
}
for(i=0; i<out; i++)
{
if(dst[i] <= -1)
dsti[i*channels+c] = -1;
else if(dst[i] >= 1)
dsti[i*channels+c] = 1;
else
dsti[i*channels+c] = dst[i];
}
}
sf_writef_float(dstfile, dsti, out);
bufferpos = block - inUsed;
for(i=0; i<bufferpos*channels; i++)
srci[i] = srci[i+(inUsed*channels)];
pos += inUsed;
outcount += out;
}
sf_close(srcfile);
sf_close(dstfile);
gettimeofday(&tv1, NULL);
deltat =
(tv1.tv_sec + tv1.tv_usec * 0.000001) -
(tv0.tv_sec + tv0.tv_usec * 0.000001);
printf("Elapsed time: %.3f seconds\n", deltat);
printf("%d frames written to output file\n", outcount);
free(src);
free(srci);
free(dst);
free(dsti);
exit(0);
}
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