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callback_test.c

/*
** Copyright (C) 2003-2008 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 <string.h>
#include <math.h>

#include <samplerate.h>

#include "util.h"

#define     BUFFER_LEN        90000
#define CB_READ_LEN           256

static void callback_test (int converter, double ratio) ;

int
main (void)
{     static double src_ratios [] =
      {     1.0, 0.099, 0.1, 0.33333333, 0.789, 1.0001, 1.9, 3.1, 9.9
      } ;

      int k ;

      puts ("") ;

      puts ("    Zero Order Hold interpolator :") ;
      for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
            callback_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;

      puts ("    Linear interpolator :") ;
      for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
            callback_test (SRC_LINEAR, src_ratios [k]) ;

      puts ("    Sinc interpolator :") ;
      for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
            callback_test (SRC_SINC_FASTEST, src_ratios [k]) ;

      puts ("") ;

      return 0 ;
} /* main */

/*=====================================================================================
*/

typedef struct
{     int channels ;
      long count, total ;
      float data [BUFFER_LEN] ;
} TEST_CB_DATA ;

static long
test_callback_func (void *cb_data, float **data)
{     TEST_CB_DATA *pcb_data ;

      long frames ;

      if ((pcb_data = cb_data) == NULL)
            return 0 ;

      if (data == NULL)
            return 0 ;

      if (pcb_data->total - pcb_data->count > CB_READ_LEN)
            frames = CB_READ_LEN ;
      else
            frames = pcb_data->total - pcb_data->count ;

      *data = pcb_data->data + pcb_data->count ;
      pcb_data->count += frames ;

      return frames ;
} /* test_callback_func */


static void
callback_test (int converter, double src_ratio)
{     static TEST_CB_DATA test_callback_data ;
      static float output [BUFFER_LEN] ;

      SRC_STATE   *src_state ;

      long  read_count, read_total ;
      int   input_len, output_len, error ;

      printf ("\tcallback_test    (SRC ratio = %6.4f) ........... ", src_ratio) ;
      fflush (stdout) ;

      /* Calculate maximun input and output lengths. */
      if (src_ratio >= 1.0)
      {     output_len = BUFFER_LEN ;
            input_len = (int) floor (BUFFER_LEN / src_ratio) ;
            }
      else
      {     input_len = BUFFER_LEN ;
            output_len = (int) floor (BUFFER_LEN * src_ratio) ;
            } ;

      /* Reduce input_len by 10 so output is longer than necessary. */
      input_len -= 10 ;

      if (output_len > BUFFER_LEN)
      {     printf ("\n\nLine %d : output_len > BUFFER_LEN\n\n", __LINE__) ;
            exit (1) ;
            } ;

      test_callback_data.channels = 1 ;
      test_callback_data.count = 0 ;
      test_callback_data.total = input_len ;

      if ((src_state = src_callback_new (test_callback_func, converter, 1, &error, &test_callback_data)) == NULL)
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            exit (1) ;
            } ;

      read_total = 0 ;
      do
      {     read_count = (ARRAY_LEN (output) - read_total > CB_READ_LEN) ? CB_READ_LEN : ARRAY_LEN (output) - read_total ;
            read_count = src_callback_read (src_state, src_ratio, read_count, output + read_total) ;
            read_total += read_count ;
            }
      while (read_count > 0) ;

      if ((error = src_error (src_state)) != 0)
      {     printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
            exit (1) ;
            } ;

      src_state = src_delete (src_state) ;

      if (fabs (read_total - src_ratio * input_len) > 2)
      {     printf ("\n\nLine %d : input / output length mismatch.\n\n", __LINE__) ;
            printf ("    input len  : %d\n", input_len) ;
            printf ("    output len : %ld (should be %g +/- 2)\n\n", read_total, floor (0.5 + src_ratio * input_len)) ;
            exit (1) ;
            } ;

      puts ("ok") ;

      return ;
} /* callback_test */


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