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/*
** Copyright (C) 2002-2004 Erik de Castro Lopo <erikd@mega-nerd.com>
**
** 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 <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "util.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846264338
#endif
void
gen_windowed_sines (float *data, int data_len, double *freqs, int freq_count)
{ int k, freq ;
double amplitude, phase ;
amplitude = 1.0 / freq_count ;
for (k = 0 ; k < data_len ; k++)
data [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" __FILE__ " : Error : freq [%d] == %g is out of range. Should be < 0.5.\n", freq, freqs [freq]) ;
exit (1) ;
} ;
for (k = 0 ; k < data_len ; k++)
data [k] += amplitude * sin (freqs [freq] * (2 * k) * M_PI + phase) ;
} ;
/* Apply Hanning Window. */
for (k = 0 ; k < data_len ; k++)
data [k] *= 0.5 - 0.5 * cos ((2 * k) * M_PI / (data_len - 1)) ;
/* data [k] *= 0.3635819 - 0.4891775 * cos ((2 * k) * M_PI / (data_len - 1))
+ 0.1365995 * cos ((4 * k) * M_PI / (data_len - 1))
- 0.0106411 * cos ((6 * k) * M_PI / (data_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
force_efence_banner (void)
{ void *dummy ;
dummy = malloc (1) ;
free (dummy) ;
} /* force_efence_banner */
/*
** Do not edit or modify anything in this comment block.
** The arch-tag line is a file identity tag for the GNU Arch
** revision control system.
**
** arch-tag: e3af4906-31f4-43e1-87ce-d2a49b506609
*/
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