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varispeed_test.c

/*
** Copyright (C) 2006-2008 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 <string.h>

#include <samplerate.h>

#include "util.h"

#define     BUFFER_LEN        (1 << 16)

static void varispeed_test (int converter, double target_snr) ;

int
main (void)
{
      puts ("") ;
      printf ("    Zero Order Hold interpolator    : ") ;
      varispeed_test (SRC_ZERO_ORDER_HOLD, 10.0) ;

      printf ("    Linear interpolator             : ") ;
      varispeed_test (SRC_LINEAR, 10.0) ;

      printf ("    Sinc interpolator               : ") ;
      varispeed_test (SRC_SINC_FASTEST, 115.0) ;

      puts ("") ;

      return 0 ;
} /* main */

static void
varispeed_test (int converter, double target_snr)
{     static float input [BUFFER_LEN], output [BUFFER_LEN] ;
      double sine_freq, snr ;

      SRC_STATE   *src_state ;
      SRC_DATA    src_data ;

      int input_len, error ;

      memset (input, 0, sizeof (input)) ;

      input_len = ARRAY_LEN (input) / 2 ;

      sine_freq = 0.0111 ;
      gen_windowed_sines (1, &sine_freq, 1.0, input, input_len) ;

      /* Perform sample rate conversion. */
      if ((src_state = src_new (converter, 1, &error)) == NULL)
      {     printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ;
            exit (1) ;
            } ;

      src_data.end_of_input = 1 ;

      src_data.data_in = input ;
      src_data.input_frames = input_len ;

      src_data.src_ratio = 3.0 ;

      src_data.data_out = output ;
      src_data.output_frames = ARRAY_LEN (output) ;

      if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            exit (1) ;
            } ;

      if ((error = src_process (src_state, &src_data)))
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
            printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
            exit (1) ;
            } ;

      if (src_data.input_frames_used != input_len)
      {     printf ("\n\nLine %d : unused input.\n", __LINE__) ;
            printf ("\tinput_len         : %d\n", input_len) ;
            printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
            exit (1) ;
            } ;

      /* Copy the last output to the input. */
      memcpy (input, output, sizeof (input)) ;
      reverse_data (input, src_data.output_frames_gen) ;

      if ((error = src_reset (src_state)))
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            exit (1) ;
            } ;

      src_data.end_of_input = 1 ;

      src_data.data_in = input ;
      input_len = src_data.input_frames = src_data.output_frames_gen ;

      src_data.data_out = output ;
      src_data.output_frames = ARRAY_LEN (output) ;

      if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            exit (1) ;
            } ;

      if ((error = src_process (src_state, &src_data)))
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
            printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
            exit (1) ;
            } ;

      if (src_data.input_frames_used != input_len)
      {     printf ("\n\nLine %d : unused input.\n", __LINE__) ;
            printf ("\tinput_len         : %d\n", input_len) ;
            printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
            exit (1) ;
            } ;

      src_state = src_delete (src_state) ;

      snr = calculate_snr (output, src_data.output_frames_gen, 1) ;

      if (target_snr > snr)
      {     printf ("\n\nLine %d : snr (%3.1f) does not meet target (%3.1f)\n\n", __LINE__, snr, target_snr) ;
            save_oct_float ("varispeed.mat", input, src_data.input_frames, output, src_data.output_frames_gen) ;
            exit (1) ;
            } ;

      puts ("ok") ;

      return ;
} /* varispeed_test */


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