Re: [Bluez-devel] sbc analysis code

["Brad Midgley" <bmidgley@gmail.com>]

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Marcel

> > it is currently in its own autoconf harness but I would just use the one c file.
>
> fix the coding style and send me a version that I can include. I will
> take care of the aufoconf/automake magic. Don't mess around with it.

hmm... indent likes to break lines. Let me know if the loops are
nested too deeply.

Brad

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/*                                                                         *
 *   Copyright (C) 2007 by Frédéric 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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

/*

A2DP Test Specification Chapter 4.6 (p 25)
namely SBC codec conformance test
This is a test procedure for SBC

*/

#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 MAXFRAMESTESTED infostst->frames
#define TSTSAMPLEFACTOR(x) (x)
#define DEFACCURACY 7

void usage()
{
	printf
	    ("usage: sbctester <reference> <filetocheck>\t\tCheck sbc decoded file against spec\n");
	printf("usage: sbctester <integer>\t\tTest normalize fonction\n");
}

double sampletobits(short sample16, int verbose)
{
	double bits = 0;
	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++) {
		unsigned short 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;
}

int calculate_rms_level(SNDFILE * sndref, SF_INFO * infosref,
			SNDFILE * sndtst, SF_INFO * infostst, int accuracy,
			char *csvname)
{
	int i, j, verdict = 0;
	short refsample[MAXCHANNELS], tstsample[MAXCHANNELS];
	double refbits, tstbits;
	double rms;
	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;

	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 < MAXFRAMESTESTED; i++) {
		int r1;
		if (csv)
			fprintf(csv, "%d;", i);
		r1 = sf_read_short(sndref, refsample, infostst->channels);
		if (r1 == infostst->channels) {
			int r2 =
			    sf_read_short(sndtst, tstsample,
					  infostst->channels);
			if (r2 == infostst->channels) {
				for (j = 0; j < infostst->channels; j++) {
					if (csv)
						fprintf(csv, "%d;%d;",
							refsample[j],
							tstsample[j]);

					refbits =
					    sampletobits(refsample[j], 0);
					tstbits =
					    sampletobits(TSTSAMPLEFACTOR
							 (tstsample[j]),
							 0);

					rms_accu[j] +=
					    pow(tstbits - refbits, 2.0);
				}
			} else {
				printf
				    ("Failed to read test data:%s (r2=%d, channels=%d)\n",
				     sf_strerror(sndtst), r2,
				     infostst->channels);
				exit(0);
			}
		} else {
			printf
			    ("Failed to read reference data:%s (r1=%d, channels=%d)",
			     sf_strerror(sndref), r1, infostst->channels);
			exit(0);
		}

		if (csv)
			fprintf(csv, "\r\n");
	}

	if (csv)
		fclose(csv);

	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;
}

int check_absolute_diff(SNDFILE * sndref, SF_INFO * infosref,
			SNDFILE * sndtst, SF_INFO * infostst, int accuracy)
{
	int i, j, verdict = 0;
	short refsample[MAXCHANNELS], tstsample[MAXCHANNELS],
	    refmax[MAXCHANNELS], tstmax[MAXCHANNELS];
	double refbits, tstbits;
	double rms_absolute = 1.0 / (pow(2, accuracy - 2));
	double calc_max[MAXCHANNELS];
	int calc_count = 0;

	memset(&refmax, 0, sizeof(refmax));
	memset(&tstmax, 0, sizeof(tstmax));
	memset(&calc_max, 0, sizeof(calc_max));

	verdict = 1;
	sf_seek(sndref, 0, SEEK_SET);
	sf_seek(sndtst, 0, SEEK_SET);

	printf("Absolute max: %f\n", rms_absolute);
	for (i = 0; i < MAXFRAMESTESTED; i++) {
		short r1;
		r1 = sf_read_short(sndref, refsample, infostst->channels);
		if (r1 == infostst->channels) {
			int r2 =
			    sf_read_short(sndtst, tstsample,
					  infostst->channels);
			if (r2 == infostst->channels) {
				for (j = 0; j < infostst->channels; j++) {
					double cur_diff;

					refbits =
					    sampletobits(refsample[j], 0);
					tstbits =
					    sampletobits(TSTSAMPLEFACTOR
							 (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];
					}
				}
			} else {
				printf
				    ("Failed to read test data:%s (r2=%d, channels=%d)\n",
				     sf_strerror(sndtst), r2,
				     infostst->channels);
				exit(0);
			}
		} else {
			printf
			    ("Failed to read reference data:%s (r1=%d, channels=%d)",
			     sf_strerror(sndref), r1, infostst->channels);
			exit(0);
		}
	}

	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;
}

int main(int argc, char *argv[])
{
	char *ref;
	char *tst;
	SNDFILE *sndref;
	SNDFILE *sndtst;
	SF_INFO infosref;
	SF_INFO infostst;

	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];

	// open both files
	printf("opening reference %s\n", ref);

	sndref = sf_open(ref, SFM_READ, &infosref);
	if (sndref) {
		printf("opening testfile %s\n", tst);
		sndtst = sf_open(tst, SFM_READ, &infostst);
		if (sndtst) {
			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) {
				// compare number of samples
				if ( /*infosref.frames == infostst.frames && */ infosref.samplerate == infostst.samplerate && infosref.channels == infostst.channels) {
					int accuracy = DEFACCURACY;
					printf("Accuracy: %d\n", accuracy);
					int rms_absolute, pass_rms,
					    pass_absolute, pass;

					// Condition 1 rms level
					pass_rms =
					    calculate_rms_level(sndref,
								&infosref,
								sndtst,
								&infostst,
								accuracy,
								"out.csv");

					// Condition 2 absolute difference
					pass_absolute =
					    check_absolute_diff(sndref,
								&infosref,
								sndtst,
								&infostst,
								accuracy);

					// Verdict
					pass = pass_rms && pass_absolute;
					printf("Verdict: %s\n",
					       pass ? "pass" : "fail");
				} else {
					printf
					    ("Cannot compare files with different charasteristics\n");
				}
			} else {
				printf("Too many channels\n");
			}
			sf_close(sndtst);
		} else {
			printf("Failed to open test file\n");
		}
		sf_close(sndref);
	} else {
		printf("Failed to open reference file\n");
	}

	return EXIT_SUCCESS;
}

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