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/*
* Bluetooth low-complexity, subband codec (SBC) library
* Copyright (C) 2007-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2007-2008 Frederic Dalleau <fdalleau@free.fr>
* Copyright (C) 2008-2010 Nokia Corporation
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <sndfile.h>
#include <math.h>
#include <string.h>
#define MAXCHANNELS 2
#define DEFACCURACY 7
static double sampletobits(short sample16, int verbose)
{
double bits = 0;
unsigned short bit;
int i;
if (verbose)
printf("===> sampletobits(%hd, %04hX)\n", sample16, sample16);
/* Bit 0 is MSB */
if (sample16 < 0)
bits = -1;
if (verbose)
printf("%d", (sample16 < 0) ? 1 : 0);
/* Bit 15 is LSB */
for (i = 1; i < 16; i++) {
bit = (unsigned short) sample16;
bit >>= 15 - i;
bit %= 2;
if (verbose)
printf("%d", bit);
if (bit)
bits += (1.0 / pow(2.0, i));
}
if (verbose)
printf("\n");
return bits;
}
static int calculate_rms_level(SNDFILE * sndref, SF_INFO * infosref,
SNDFILE * sndtst, SF_INFO * infostst,
int accuracy, char *csvname)
{
short refsample[MAXCHANNELS], tstsample[MAXCHANNELS];
double refbits, tstbits;
double rms_accu[MAXCHANNELS];
double rms_level[MAXCHANNELS];
double rms_limit = 1.0 / (pow(2.0, accuracy - 1) * pow(12.0, 0.5));
FILE *csv = NULL;
int i, j, r1, r2, verdict;
if (csvname)
csv = fopen(csvname, "wt");
if (csv) {
fprintf(csv, "num;");
for (j = 0; j < infostst->channels; j++)
fprintf(csv, "ref channel %d;tst channel %d;", j, j);
fprintf(csv, "\r\n");
}
sf_seek(sndref, 0, SEEK_SET);
sf_seek(sndtst, 0, SEEK_SET);
memset(rms_accu, 0, sizeof(rms_accu));
memset(rms_level, 0, sizeof(rms_level));
for (i = 0; i < infostst->frames; i++) {
if (csv)
fprintf(csv, "%d;", i);
r1 = sf_read_short(sndref, refsample, infostst->channels);
if (r1 != infostst->channels) {
printf("Failed to read reference data: %s "
"(r1=%d, channels=%d)",
sf_strerror(sndref), r1,
infostst->channels);
if (csv)
fclose(csv);
return -1;
}
r2 = sf_read_short(sndtst, tstsample, infostst->channels);
if (r2 != infostst->channels) {
printf("Failed to read test data: %s "
"(r2=%d, channels=%d)\n",
sf_strerror(sndtst), r2,
infostst->channels);
if (csv)
fclose(csv);
return -1;
}
for (j = 0; j < infostst->channels; j++) {
if (csv)
fprintf(csv, "%d;%d;", refsample[j],
tstsample[j]);
refbits = sampletobits(refsample[j], 0);
tstbits = sampletobits(tstsample[j], 0);
rms_accu[j] += pow(tstbits - refbits, 2.0);
}
if (csv)
fprintf(csv, "\r\n");
}
printf("Limit: %f\n", rms_limit);
for (j = 0; j < infostst->channels; j++) {
printf("Channel %d\n", j);
printf("Accumulated %f\n", rms_accu[j]);
rms_accu[j] /= (double) infostst->frames;
printf("Accumulated / %f = %f\n", (double) infostst->frames,
rms_accu[j]);
rms_level[j] = sqrt(rms_accu[j]);
printf("Level = %f (%f x %f = %f)\n",
rms_level[j], rms_level[j], rms_level[j],
rms_level[j] * rms_level[j]);
}
verdict = 1;
for (j = 0; j < infostst->channels; j++) {
printf("Channel %d: %f\n", j, rms_level[j]);
if (rms_level[j] > rms_limit)
verdict = 0;
}
printf("%s return %d\n", __FUNCTION__, verdict);
return verdict;
}
static int check_absolute_diff(SNDFILE * sndref, SF_INFO * infosref,
SNDFILE * sndtst, SF_INFO * infostst,
int accuracy)
{
short refsample[MAXCHANNELS], tstsample[MAXCHANNELS];
short refmax[MAXCHANNELS], tstmax[MAXCHANNELS];
double refbits, tstbits;
double rms_absolute = 1.0 / (pow(2, accuracy - 2));
double calc_max[MAXCHANNELS];
int calc_count = 0;
short r1, r2;
double cur_diff;
int i, j, verdict;
memset(&refmax, 0, sizeof(refmax));
memset(&tstmax, 0, sizeof(tstmax));
memset(&calc_max, 0, sizeof(calc_max));
memset(&refsample, 0, sizeof(refsample));
memset(&tstsample, 0, sizeof(tstsample));
sf_seek(sndref, 0, SEEK_SET);
sf_seek(sndtst, 0, SEEK_SET);
verdict = 1;
printf("Absolute max: %f\n", rms_absolute);
for (i = 0; i < infostst->frames; i++) {
r1 = sf_read_short(sndref, refsample, infostst->channels);
if (r1 != infostst->channels) {
printf("Failed to read reference data: %s "
"(r1=%d, channels=%d)",
sf_strerror(sndref), r1,
infostst->channels);
return -1;
}
r2 = sf_read_short(sndtst, tstsample, infostst->channels);
if (r2 != infostst->channels) {
printf("Failed to read test data: %s "
"(r2=%d, channels=%d)\n",
sf_strerror(sndtst), r2,
infostst->channels);
return -1;
}
for (j = 0; j < infostst->channels; j++) {
refbits = sampletobits(refsample[j], 0);
tstbits = sampletobits(tstsample[j], 0);
cur_diff = fabs(tstbits - refbits);
if (cur_diff > rms_absolute) {
calc_count++;
/* printf("Channel %d exceeded : fabs(%f - %f) = %f > %f\n", j, tstbits, refbits, cur_diff, rms_absolute); */
verdict = 0;
}
if (cur_diff > calc_max[j]) {
calc_max[j] = cur_diff;
refmax[j] = refsample[j];
tstmax[j] = tstsample[j];
}
}
}
for (j = 0; j < infostst->channels; j++) {
printf("Calculated max: %f (%hd-%hd=%hd)\n",
calc_max[j], tstmax[j], refmax[j],
tstmax[j] - refmax[j]);
}
printf("%s return %d\n", __FUNCTION__, verdict);
return verdict;
}
static void usage(void)
{
printf("SBC conformance test ver %s\n", VERSION);
printf("Copyright (c) 2007-2010 Marcel Holtmann\n");
printf("Copyright (c) 2007-2008 Frederic Dalleau\n\n");
printf("Usage:\n"
"\tsbctester reference.wav checkfile.wav\n"
"\tsbctester integer\n"
"\n");
printf("To test the encoder:\n");
printf("\tUse a reference codec to encode original.wav to reference.sbc\n");
printf("\tUse sbcenc to encode original.wav to checkfile.sbc\n");
printf("\tDecode both file using the reference decoder\n");
printf("\tRun sbctester with these two wav files to get the result\n\n");
printf("\tA file called out.csv is generated to use the data in a\n");
printf("\tspreadsheet application or database.\n\n");
}
int main(int argc, char *argv[])
{
SNDFILE *sndref = NULL;
SNDFILE *sndtst = NULL;
SF_INFO infosref;
SF_INFO infostst;
char *ref;
char *tst;
int pass_rms, pass_absolute, pass, accuracy;
if (argc == 2) {
double db;
printf("Test sampletobits\n");
db = sampletobits((short) atoi(argv[1]), 1);
printf("db = %f\n", db);
exit(0);
}
if (argc < 3) {
usage();
exit(1);
}
ref = argv[1];
tst = argv[2];
printf("opening reference %s\n", ref);
sndref = sf_open(ref, SFM_READ, &infosref);
if (!sndref) {
printf("Failed to open reference file\n");
exit(1);
}
printf("opening testfile %s\n", tst);
sndtst = sf_open(tst, SFM_READ, &infostst);
if (!sndtst) {
printf("Failed to open test file\n");
sf_close(sndref);
exit(1);
}
printf("reference:\n\t%d frames,\n\t%d hz,\n\t%d channels\n",
(int) infosref.frames, (int) infosref.samplerate,
(int) infosref.channels);
printf("testfile:\n\t%d frames,\n\t%d hz,\n\t%d channels\n",
(int) infostst.frames, (int) infostst.samplerate,
(int) infostst.channels);
/* check number of channels */
if (infosref.channels > 2 || infostst.channels > 2) {
printf("Too many channels\n");
goto error;
}
/* compare number of samples */
if (infosref.samplerate != infostst.samplerate ||
infosref.channels != infostst.channels) {
printf("Cannot compare files with different charasteristics\n");
goto error;
}
accuracy = DEFACCURACY;
printf("Accuracy: %d\n", accuracy);
/* Condition 1 rms level */
pass_rms = calculate_rms_level(sndref, &infosref, sndtst, &infostst,
accuracy, "out.csv");
if (pass_rms < 0)
goto error;
/* Condition 2 absolute difference */
pass_absolute = check_absolute_diff(sndref, &infosref, sndtst,
&infostst, accuracy);
if (pass_absolute < 0)
goto error;
/* Verdict */
pass = pass_rms && pass_absolute;
printf("Verdict: %s\n", pass ? "pass" : "fail");
return 0;
error:
sf_close(sndref);
sf_close(sndtst);
exit(1);
}
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