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* Bluetooth low-complexity, subband codec (SBC) library
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* Copyright (C) 2007-2008 Marcel Holtmann <marcel@holtmann.org>
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* Copyright (C) 2007-2008 Frederic Dalleau <fdalleau@free.fr>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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static double sampletobits(short sample16, int verbose)
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printf("===> sampletobits(%hd, %04hX)\n", sample16, sample16);
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printf("%d", (sample16 < 0) ? 1 : 0);
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for (i = 1; i < 16; i++) {
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bit = (unsigned short) sample16;
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bits += (1.0 / pow(2.0, i));
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static int calculate_rms_level(SNDFILE * sndref, SF_INFO * infosref,
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SNDFILE * sndtst, SF_INFO * infostst,
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int accuracy, char *csvname)
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short refsample[MAXCHANNELS], tstsample[MAXCHANNELS];
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double refbits, tstbits;
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double rms_accu[MAXCHANNELS];
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double rms_level[MAXCHANNELS];
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double rms_limit = 1.0 / (pow(2.0, accuracy - 1) * pow(12.0, 0.5));
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int i, j, r1, r2, verdict;
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csv = fopen(csvname, "wt");
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for (j = 0; j < infostst->channels; j++)
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fprintf(csv, "ref channel %d;tst channel %d;", j, j);
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sf_seek(sndref, 0, SEEK_SET);
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sf_seek(sndtst, 0, SEEK_SET);
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memset(rms_accu, 0, sizeof(rms_accu));
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memset(rms_level, 0, sizeof(rms_level));
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for (i = 0; i < infostst->frames; i++) {
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fprintf(csv, "%d;", i);
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r1 = sf_read_short(sndref, refsample, infostst->channels);
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if (r1 != infostst->channels) {
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printf("Failed to read reference data: %s "
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"(r1=%d, channels=%d)",
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sf_strerror(sndref), r1,
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r2 = sf_read_short(sndtst, tstsample, infostst->channels);
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if (r2 != infostst->channels) {
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printf("Failed to read test data: %s "
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"(r2=%d, channels=%d)\n",
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sf_strerror(sndtst), r2,
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for (j = 0; j < infostst->channels; j++) {
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fprintf(csv, "%d;%d;", refsample[j],
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refbits = sampletobits(refsample[j], 0);
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tstbits = sampletobits(tstsample[j], 0);
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rms_accu[j] += pow(tstbits - refbits, 2.0);
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fprintf(csv, "\r\n");
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printf("Limit: %f\n", rms_limit);
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for (j = 0; j < infostst->channels; j++) {
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printf("Channel %d\n", j);
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printf("Accumulated %f\n", rms_accu[j]);
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rms_accu[j] /= (double) infostst->frames;
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printf("Accumulated / %f = %f\n", (double) infostst->frames,
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rms_level[j] = sqrt(rms_accu[j]);
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printf("Level = %f (%f x %f = %f)\n",
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rms_level[j], rms_level[j], rms_level[j],
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rms_level[j] * rms_level[j]);
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for (j = 0; j < infostst->channels; j++) {
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printf("Channel %d: %f\n", j, rms_level[j]);
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if (rms_level[j] > rms_limit)
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printf("%s return %d\n", __FUNCTION__, verdict);
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static int check_absolute_diff(SNDFILE * sndref, SF_INFO * infosref,
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SNDFILE * sndtst, SF_INFO * infostst,
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short refsample[MAXCHANNELS], tstsample[MAXCHANNELS];
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short refmax[MAXCHANNELS], tstmax[MAXCHANNELS];
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double refbits, tstbits;
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double rms_absolute = 1.0 / (pow(2, accuracy - 2));
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double calc_max[MAXCHANNELS];
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memset(&refmax, 0, sizeof(refmax));
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memset(&tstmax, 0, sizeof(tstmax));
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memset(&calc_max, 0, sizeof(calc_max));
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memset(&refsample, 0, sizeof(refsample));
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memset(&tstsample, 0, sizeof(tstsample));
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sf_seek(sndref, 0, SEEK_SET);
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sf_seek(sndtst, 0, SEEK_SET);
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printf("Absolute max: %f\n", rms_absolute);
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for (i = 0; i < infostst->frames; i++) {
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r1 = sf_read_short(sndref, refsample, infostst->channels);
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if (r1 != infostst->channels) {
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printf("Failed to read reference data: %s "
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"(r1=%d, channels=%d)",
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sf_strerror(sndref), r1,
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r2 = sf_read_short(sndtst, tstsample, infostst->channels);
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if (r2 != infostst->channels) {
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printf("Failed to read test data: %s "
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"(r2=%d, channels=%d)\n",
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sf_strerror(sndtst), r2,
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for (j = 0; j < infostst->channels; j++) {
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refbits = sampletobits(refsample[j], 0);
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tstbits = sampletobits(tstsample[j], 0);
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cur_diff = fabs(tstbits - refbits);
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if (cur_diff > rms_absolute) {
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/* printf("Channel %d exceeded : fabs(%f - %f) = %f > %f\n", j, tstbits, refbits, cur_diff, rms_absolute); */
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if (cur_diff > calc_max[j]) {
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calc_max[j] = cur_diff;
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refmax[j] = refsample[j];
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tstmax[j] = tstsample[j];
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for (j = 0; j < infostst->channels; j++) {
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printf("Calculated max: %f (%hd-%hd=%hd)\n",
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calc_max[j], tstmax[j], refmax[j],
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tstmax[j] - refmax[j]);
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printf("%s return %d\n", __FUNCTION__, verdict);
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printf("SBC conformance test ver %s\n", VERSION);
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printf("Copyright (c) 2007-2008 Marcel Holtmann\n");
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printf("Copyright (c) 2007-2008 Frederic Dalleau\n\n");
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"\tsbctester reference.wav checkfile.wav\n"
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"\tsbctester integer\n"
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printf("To test the encoder:\n");
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printf("\tUse a reference codec to encode original.wav to reference.sbc\n");
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printf("\tUse sbcenc to encode original.wav to checkfile.sbc\n");
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printf("\tDecode both file using the reference decoder\n");
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printf("\tRun sbctester with these two wav files to get the result\n\n");
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printf("\tA file called out.csv is generated to use the data in a\n");
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printf("\tspreadsheet application or database.\n\n");
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int main(int argc, char *argv[])
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SNDFILE *sndref = NULL;
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SNDFILE *sndtst = NULL;
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int pass_rms, pass_absolute, pass, accuracy;
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printf("Test sampletobits\n");
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db = sampletobits((short) atoi(argv[1]), 1);
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printf("db = %f\n", db);
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printf("opening reference %s\n", ref);
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sndref = sf_open(ref, SFM_READ, &infosref);
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printf("Failed to open reference file\n");
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printf("opening testfile %s\n", tst);
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sndtst = sf_open(tst, SFM_READ, &infostst);
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printf("Failed to open test file\n");
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printf("reference:\n\t%d frames,\n\t%d hz,\n\t%d channels\n",
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(int) infosref.frames, (int) infosref.samplerate,
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(int) infosref.channels);
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printf("testfile:\n\t%d frames,\n\t%d hz,\n\t%d channels\n",
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(int) infostst.frames, (int) infostst.samplerate,
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(int) infostst.channels);
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/* check number of channels */
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if (infosref.channels > 2 || infostst.channels > 2) {
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printf("Too many channels\n");
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/* compare number of samples */
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if (infosref.samplerate != infostst.samplerate ||
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infosref.channels != infostst.channels) {
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printf("Cannot compare files with different charasteristics\n");
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accuracy = DEFACCURACY;
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printf("Accuracy: %d\n", accuracy);
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/* Condition 1 rms level */
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pass_rms = calculate_rms_level(sndref, &infosref, sndtst, &infostst,
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accuracy, "out.csv");
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/* Condition 2 absolute difference */
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pass_absolute = check_absolute_diff(sndref, &infosref, sndtst,
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&infostst, accuracy);
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if (pass_absolute < 0)
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pass = pass_rms && pass_absolute;
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printf("Verdict: %s\n", pass ? "pass" : "fail");