diff src/libsndfile-1.0.27/tests/channel_test.c @ 40:1df64224f5ac

Current libsndfile source

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libsndfile-1.0.27/tests/channel_test.c	Tue Oct 18 13:22:47 2016 +0100
@@ -0,0 +1,136 @@
+/*
+** Copyright (C) 2001-2015 Erik de Castro Lopo <[e-mail]>
+**
+** 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.
+*/
+
+#include "sfconfig.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <time.h>
+
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include <math.h>
+
+#include <sndfile.h>
+
+#include "utils.h"
+
+#define	BUFFER_LEN		(1 << 10)
+#define LOG_BUFFER_SIZE	1024
+
+static	void	channel_test			(void) ;
+static	double	max_diff		(const float *a, const float *b, unsigned int len, unsigned int * position) ;
+
+int
+main (void) // int argc, char *argv [])
+{	channel_test () ;
+	return 0 ;
+} /* main */
+
+/*============================================================================================
+**	Here are the test functions.
+*/
+
+static void
+channel_test (void)
+{	static float	float_data [1024] ;
+	static float	read_float [1024] ;
+	static int		read_int [1024] ;
+	static short	read_short [1024] ;
+	unsigned int	ch, k, position = 0 ;
+
+	gen_windowed_sine_float (float_data, ARRAY_LEN (float_data), 0.9) ;
+
+	for (ch = 1 ; ch <= 8 ; ch++)
+	{	SNDFILE	*file ;
+		SF_INFO	wsfinfo, rsfinfo ;
+		sf_count_t wframes = ARRAY_LEN (float_data) / ch ;
+		double	maxdiff ;
+		char	filename [256] ;
+
+		snprintf (filename, sizeof (filename), "chan_%d.wav", ch) ;
+		print_test_name (__func__, filename) ;
+
+		sf_info_setup (&wsfinfo, SF_FORMAT_WAV | SF_FORMAT_FLOAT, 48000, ch) ;
+		sf_info_clear (&rsfinfo) ;
+
+		/* Write the test file. */
+		file = test_open_file_or_die (filename, SFM_WRITE, &wsfinfo, SF_FALSE, __LINE__) ;
+		test_writef_float_or_die (file, 0, float_data, wframes, __LINE__) ;
+		sf_close (file) ;
+
+		/* Read it as float and test. */
+		file = test_open_file_or_die (filename, SFM_READ, &rsfinfo, SF_FALSE, __LINE__) ;
+		exit_if_true (rsfinfo.frames == 0,
+				"\n\nLine %d : Frames in file %" PRId64 ".\n\n", __LINE__, rsfinfo.frames) ;
+		exit_if_true (wframes != rsfinfo.frames,
+				"\n\nLine %d : Wrote %" PRId64 ", read %" PRId64 " frames.\n\n", __LINE__, wframes, rsfinfo.frames) ;
+
+		sf_command (file, SFC_SET_SCALE_FLOAT_INT_READ, NULL, SF_TRUE) ;
+
+		test_readf_float_or_die (file, 0, read_float, rsfinfo.frames, __LINE__) ;
+		compare_float_or_die (float_data, read_float, ch * rsfinfo.frames, __LINE__) ;
+
+		/* Read it as short and test. */
+		test_seek_or_die (file, 0, SEEK_SET, 0, ch, __LINE__) ;
+		test_readf_short_or_die (file, 0, read_short, rsfinfo.frames, __LINE__) ;
+
+		for (k = 0 ; k < ARRAY_LEN (read_float) ; k++)
+			read_float [k] = read_short [k] * (0.9 / 0x8000) ;
+
+		maxdiff = max_diff (float_data, read_float, ch * rsfinfo.frames, &position) ;
+		exit_if_true (maxdiff > 0.5, "\n\nLine %d : Max diff is %f at index %u\n\n", __LINE__, maxdiff, position) ;
+
+		/* Read it as int and test. */
+		test_seek_or_die (file, 0, SEEK_SET, 0, ch, __LINE__) ;
+		test_readf_int_or_die (file, 0, read_int, rsfinfo.frames, __LINE__) ;
+
+		for (k = 0 ; k < ARRAY_LEN (read_float) ; k++)
+			read_float [k] = read_int [k] * (0.9 / 0x80000000) ;
+
+		maxdiff = max_diff (float_data, read_float, ch * rsfinfo.frames, &position) ;
+		exit_if_true (maxdiff > 0.5, "\n\nLine %d : Max diff is %f at index %u\n\n", __LINE__, maxdiff, position) ;
+
+		sf_close (file) ;
+		unlink (filename) ;
+		printf ("ok\n") ;
+		} ;
+
+	return ;
+} /* channel_test */
+
+static double
+max_diff (const float *a, const float *b, unsigned int len, unsigned int * position)
+{	double mdiff = 0.0, diff ;
+	unsigned int k ;
+
+	for (k = 0 ; k < len ; k++)
+	{	diff = fabs (a [k] - b [k]) ;
+		if (diff > mdiff)
+		{ 	mdiff = diff ;
+			*position = k ;
+			} ;
+		} ;
+
+	return mdiff ;
+} /* max_diff */