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Merge changes from team/russell/codec_resample
This commit imports libresample for use in Asterisk. It also adds a new codec module, codec_resample. This module uses libresample to re-sample signed linear audio between 8 kHz and 16 kHz. It also provides an alternative for converting between 16 kHz G.722 and 8 kHz signed linear when using G.722, which will likely be useful as some people have complained about volume issues when the current codec_g722 converts to 8 kHz signed linear. But, to test this, you will have to disable the g722-to-slin and g722-to-slin16 translators in codec_g722.c. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@95501 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
213
main/libresample/tests/resample-sndfile.c
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213
main/libresample/tests/resample-sndfile.c
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/**********************************************************************
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resample-sndfile.c
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Written by Dominic Mazzoni
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Based on resample-1.7:
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http://www-ccrma.stanford.edu/~jos/resample/
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License: LGPL - see the file LICENSE.txt for more information
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**********************************************************************/
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#include "../include/libresample.h"
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#include <sndfile.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <sys/time.h>
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#define MIN(A, B) (A) < (B)? (A) : (B)
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void usage(char *progname)
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{
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fprintf(stderr, "Usage: %s -by <ratio> <input> <output>\n", progname);
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fprintf(stderr, " %s -to <rate> <input> <output>\n", progname);
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fprintf(stderr, "\n");
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exit(-1);
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}
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int main(int argc, char **argv)
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{
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SNDFILE *srcfile, *dstfile;
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SF_INFO srcinfo, dstinfo;
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SF_FORMAT_INFO formatinfo;
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char *extension;
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void **handle;
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int channels;
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int srclen, dstlen;
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float *src, *srci;
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float *dst, *dsti;
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double ratio = 0.0;
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double srcrate;
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double dstrate = 0.0;
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struct timeval tv0, tv1;
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double deltat;
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int numformats;
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int pos, bufferpos, outcount;
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int i, c;
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if (argc != 5)
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usage(argv[0]);
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if (!strcmp(argv[1], "-by")) {
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ratio = atof(argv[2]);
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if (ratio <= 0.0) {
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fprintf(stderr, "Ratio of %f is illegal\n", ratio);
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usage(argv[0]);
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}
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}
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else if (!strcmp(argv[1], "-to")) {
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dstrate = atof(argv[2]);
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if (dstrate < 10.0 || dstrate > 100000.0) {
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fprintf(stderr, "Sample rate of %f is illegal\n", dstrate);
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usage(argv[0]);
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}
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}
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else
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usage(argv[0]);
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memset(&srcinfo, 0, sizeof(srcinfo));
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memset(&dstinfo, 0, sizeof(dstinfo));
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srcfile = sf_open(argv[3], SFM_READ, &srcinfo);
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if (!srcfile) {
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fprintf(stderr, "%s", sf_strerror(NULL));
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exit(-1);
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}
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srcrate = srcinfo.samplerate;
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if (dstrate == 0.0)
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dstrate = srcrate * ratio;
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else
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ratio = dstrate / srcrate;
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channels = srcinfo.channels;
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/* figure out format of destination file */
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extension = strstr(argv[4], ".");
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if (extension) {
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extension++;
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sf_command(NULL, SFC_GET_FORMAT_MAJOR_COUNT,
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&numformats, sizeof(numformats));
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for(i=0; i<numformats; i++) {
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memset(&formatinfo, 0, sizeof(formatinfo));
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formatinfo.format = i;
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sf_command(NULL, SFC_GET_FORMAT_MAJOR,
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&formatinfo, sizeof(formatinfo));
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if (!strcmp(formatinfo.extension, extension)) {
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printf("Using %s for output format.\n", formatinfo.name);
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dstinfo.format = formatinfo.format |
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(srcinfo.format & SF_FORMAT_SUBMASK);
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break;
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}
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}
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}
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if (!dstinfo.format) {
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if (extension)
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printf("Warning: output format (%s) not recognized, "
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"using same as input format.\n",
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extension);
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dstinfo.format = srcinfo.format;
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}
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dstinfo.samplerate = (int)(dstrate + 0.5);
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dstinfo.channels = channels;
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dstfile = sf_open(argv[4], SFM_WRITE, &dstinfo);
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if (!dstfile) {
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fprintf(stderr, "%s", sf_strerror(NULL));
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exit(-1);
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}
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printf("Source: %s (%d frames, %.2f Hz)\n",
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argv[3], (int)srcinfo.frames, srcrate);
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printf("Destination: %s (%.2f Hz, ratio=%.5f)\n", argv[4],
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dstrate, ratio);
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srclen = 4096;
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dstlen = (srclen * ratio + 1000);
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srci = (float *)malloc(srclen * channels * sizeof(float));
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dsti = (float *)malloc(dstlen * channels * sizeof(float));
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src = (float *)malloc(srclen * sizeof(float));
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dst = (float *)malloc(dstlen * sizeof(float));
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handle = (void **)malloc(channels * sizeof(void *));
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for(c=0; c<channels; c++)
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handle[c] = resample_open(1, ratio, ratio);
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gettimeofday(&tv0, NULL);
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pos = 0;
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bufferpos = 0;
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outcount = 0;
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while(pos < srcinfo.frames) {
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int block = MIN(srclen-bufferpos, srcinfo.frames-pos);
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int lastFlag = (pos+block == srcinfo.frames);
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int inUsed, inUsed2=0, out=0, out2=0;
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sf_readf_float(srcfile, &srci[bufferpos*channels], block);
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block += bufferpos;
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for(c=0; c<channels; c++) {
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for(i=0; i<block; i++)
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src[i] = srci[i*channels+c];
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inUsed = 0;
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out = resample_process(handle[c], ratio, src, block, lastFlag,
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&inUsed, dst, dstlen);
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if (c==0) {
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inUsed2 = inUsed;
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out2 = out;
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}
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else {
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if (inUsed2 != inUsed || out2 != out) {
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fprintf(stderr, "Fatal error: channels out of sync!\n");
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exit(-1);
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}
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}
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for(i=0; i<out; i++)
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{
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if(dst[i] <= -1)
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dsti[i*channels+c] = -1;
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else if(dst[i] >= 1)
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dsti[i*channels+c] = 1;
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else
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dsti[i*channels+c] = dst[i];
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}
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}
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sf_writef_float(dstfile, dsti, out);
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bufferpos = block - inUsed;
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for(i=0; i<bufferpos*channels; i++)
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srci[i] = srci[i+(inUsed*channels)];
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pos += inUsed;
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outcount += out;
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}
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sf_close(srcfile);
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sf_close(dstfile);
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gettimeofday(&tv1, NULL);
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deltat =
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(tv1.tv_sec + tv1.tv_usec * 0.000001) -
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(tv0.tv_sec + tv0.tv_usec * 0.000001);
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printf("Elapsed time: %.3f seconds\n", deltat);
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printf("%d frames written to output file\n", outcount);
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free(src);
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free(srci);
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free(dst);
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free(dsti);
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exit(0);
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}
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