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-rw-r--r--sbc/sbctester.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/sbc/sbctester.c b/sbc/sbctester.c
new file mode 100644
index 0000000..b1e3608
--- /dev/null
+++ b/sbc/sbctester.c
@@ -0,0 +1,358 @@
+/*
+ *
+ * Bluetooth low-complexity, subband codec (SBC) library
+ *
+ * Copyright (C) 2008-2010 Nokia Corporation
+ * Copyright (C) 2007-2010 Marcel Holtmann <marcel@holtmann.org>
+ * Copyright (C) 2007-2008 Frederic Dalleau <fdalleau@free.fr>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#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()
+{
+ 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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