comparison src/libsamplerate-0.1.9/tests/util.c @ 41:481f5f8c5634

Current libsamplerate source

+/*
+** Copyright (c) 2002-2016, Erik de Castro Lopo <[e-mail]>
+** All rights reserved.
+**
+** This code is released under 2-clause BSD license. Please see the
+** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <math.h>
+
+#include	"util.h"
+
+#ifndef	M_PI
+#define	M_PI			3.14159265358979323846264338
+#endif
+
+void
+gen_windowed_sines (int freq_count, const double *freqs, double max, float *output, int output_len)
+{	int 	k, freq ;
+	double	amplitude, phase ;
+
+	amplitude = max / freq_count ;
+
+	for (k = 0 ; k < output_len ; k++)
+		output [k] = 0.0 ;
+
+	for (freq = 0 ; freq < freq_count ; freq++)
+	{	phase = 0.9 * M_PI / freq_count ;
+
+		if (freqs [freq] <= 0.0 || freqs [freq] >= 0.5)
+		{	printf ("\n%s : Error : freq [%d] == %g is out of range. Should be < 0.5.\n", __FILE__, freq, freqs [freq]) ;
+			exit (1) ;
+			} ;
+
+		for (k = 0 ; k < output_len ; k++)
+			output [k] += amplitude * sin (freqs [freq] * (2 * k) * M_PI + phase) ;
+		} ;
+
+	/* Apply Hanning Window. */
+	for (k = 0 ; k < output_len ; k++)
+		output [k] *= 0.5 - 0.5 * cos ((2 * k) * M_PI / (output_len - 1)) ;
+
+	/*	data [k] *= 0.3635819 - 0.4891775 * cos ((2 * k) * M_PI / (output_len - 1))
+					+ 0.1365995 * cos ((4 * k) * M_PI / (output_len - 1))
+					- 0.0106411 * cos ((6 * k) * M_PI / (output_len - 1)) ;
+		*/
+
+	return ;
+} /* gen_windowed_sines */
+
+void
+save_oct_float (char *filename, float *input, int in_len, float *output, int out_len)
+{	FILE 	*file ;
+	int		k ;
+
+	printf ("Dumping input and output data to file : %s.\n\n", filename) ;
+
+	if (! (file = fopen (filename, "w")))
+		return ;
+
+	fprintf (file, "# Not created by Octave\n") ;
+
+	fprintf (file, "# name: input\n") ;
+	fprintf (file, "# type: matrix\n") ;
+	fprintf (file, "# rows: %d\n", in_len) ;
+	fprintf (file, "# columns: 1\n") ;
+
+	for (k = 0 ; k < in_len ; k++)
+		fprintf (file, "% g\n", input [k]) ;
+
+	fprintf (file, "# name: output\n") ;
+	fprintf (file, "# type: matrix\n") ;
+	fprintf (file, "# rows: %d\n", out_len) ;
+	fprintf (file, "# columns: 1\n") ;
+
+	for (k = 0 ; k < out_len ; k++)
+		fprintf (file, "% g\n", output [k]) ;
+
+	fclose (file) ;
+	return ;
+} /* save_oct_float */
+
+void
+save_oct_double (char *filename, double *input, int in_len, double *output, int out_len)
+{	FILE 	*file ;
+	int		k ;
+
+	printf ("Dumping input and output data to file : %s.\n\n", filename) ;
+
+	if (! (file = fopen (filename, "w")))
+		return ;
+
+	fprintf (file, "# Not created by Octave\n") ;
+
+	fprintf (file, "# name: input\n") ;
+	fprintf (file, "# type: matrix\n") ;
+	fprintf (file, "# rows: %d\n", in_len) ;
+	fprintf (file, "# columns: 1\n") ;
+
+	for (k = 0 ; k < in_len ; k++)
+		fprintf (file, "% g\n", input [k]) ;
+
+	fprintf (file, "# name: output\n") ;
+	fprintf (file, "# type: matrix\n") ;
+	fprintf (file, "# rows: %d\n", out_len) ;
+	fprintf (file, "# columns: 1\n") ;
+
+	for (k = 0 ; k < out_len ; k++)
+		fprintf (file, "% g\n", output [k]) ;
+
+	fclose (file) ;
+	return ;
+} /* save_oct_double */
+
+void
+interleave_data (const float *in, float *out, int frames, int channels)
+{	int fr, ch ;
+
+	for (fr = 0 ; fr < frames ; fr++)
+		for (ch = 0 ; ch < channels ; ch++)
+			out [ch + channels * fr] = in [fr + frames * ch] ;
+
+	return ;
+} /* interleave_data */
+
+void
+deinterleave_data (const float *in, float *out, int frames, int channels)
+{	int fr, ch ;
+
+	for (ch = 0 ; ch < channels ; ch++)
+		for (fr = 0 ; fr < frames ; fr++)
+			out [fr + frames * ch] = in [ch + channels * fr] ;
+
+	return ;
+} /* deinterleave_data */
+
+void
+reverse_data (float *data, int datalen)
+{	int left, right ;
+	float temp ;
+
+	left = 0 ;
+	right = datalen - 1 ;
+
+	while (left < right)
+	{	temp = data [left] ;
+		data [left] = data [right] ;
+		data [right] = temp ;
+		left ++ ;
+		right -- ;
+		} ;
+
+} /* reverse_data */
+
+const char *
+get_cpu_name (void)
+{
+	const char *name = "Unknown", *search = NULL ;
+	static char buffer [512] ;
+	FILE * file = NULL ;
+	int is_pipe = 0 ;
+
+#if defined (__linux__)
+	file = fopen ("/proc/cpuinfo", "r") ;
+	search = "model name" ;
+#elif defined (__APPLE__)
+	file = popen ("/usr/sbin/system_profiler -detailLevel full SPHardwareDataType", "r") ;
+	search = "Processor Name" ;
+	is_pipe = 1 ;
+#elif defined (__FreeBSD__)
+	file = popen ("sysctl -a", "r") ;
+	search = "hw.model" ;
+	is_pipe = 1 ;
+#else
+	file = NULL ;
+#endif
+
+	if (file == NULL)
+		return name ;
+
+	if (search == NULL)
+	{	printf ("Error : search is NULL in function %s.\n", __func__) ;
+		return name ;
+		} ;
+
+	while (fgets (buffer, sizeof (buffer), file) != NULL)
+		if (strstr (buffer, search))
+		{	char *src, *dest ;
+
+			if ((src = strchr (buffer, ':')) != NULL)
+			{	src ++ ;
+				while (isspace (src [0]))
+					src ++ ;
+				name = src ;
+
+				/* Remove consecutive spaces. */
+				src ++ ;
+				for (dest = src ; src [0] ; src ++)
+				{	if (isspace (src [0]) && isspace (dest [-1]))
+						continue ;
+					dest [0] = src [0] ;
+					dest ++ ;
+					} ;
+				dest [0] = 0 ;
+				break ;
+				} ;
+			} ;
+
+	if (is_pipe)
+		pclose (file) ;
+	else
+		fclose (file) ;
+
+	return name ;
+} /* get_cpu_name */
+