callback_test.c

   1 /*
   2 ** Copyright (c) 2003-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
   3 ** All rights reserved.
   4 **
   5 ** This code is released under 2-clause BSD license. Please see the
   6 ** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
   7 */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <math.h>
  13
  14 #include <samplerate.h>
  15
  16 #include "util.h"
  17
  18 #define BUFFER_LEN              10000
  19 #define CB_READ_LEN             256
  20
  21 static void callback_test (int converter, double ratio) ;
  22 static void end_of_stream_test (int converter) ;
  23
  24 int
  25 main (void)
  26 {       static double src_ratios [] =
  27         {       1.0, 0.099, 0.1, 0.33333333, 0.789, 1.0001, 1.9, 3.1, 9.9
  28         } ;
  29
  30         int k ;
  31
  32         puts ("") ;
  33
  34         puts ("    Zero Order Hold interpolator :") ;
  35         for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
  36                 callback_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
  37
  38         puts ("    Linear interpolator :") ;
  39         for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
  40                 callback_test (SRC_LINEAR, src_ratios [k]) ;
  41
  42         puts ("    Sinc interpolator :") ;
  43         for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
  44                 callback_test (SRC_SINC_FASTEST, src_ratios [k]) ;
  45
  46         puts ("") ;
  47
  48         puts ("    End of stream test :") ;
  49         end_of_stream_test (SRC_ZERO_ORDER_HOLD) ;
  50         end_of_stream_test (SRC_LINEAR) ;
  51         end_of_stream_test (SRC_SINC_FASTEST) ;
  52
  53         puts ("") ;
  54         return 0 ;
  55 } /* main */
  56
  57 /*=====================================================================================
  58 */
  59
  60 typedef struct
  61 {       int channels ;
  62         long count, total ;
  63         int end_of_data ;
  64         float data [BUFFER_LEN] ;
  65 } TEST_CB_DATA ;
  66
  67 static long
  68 test_callback_func (void *cb_data, float **data)
  69 {       TEST_CB_DATA *pcb_data ;
  70
  71         long frames ;
  72
  73         if ((pcb_data = cb_data) == NULL)
  74                 return 0 ;
  75
  76         if (data == NULL)
  77                 return 0 ;
  78
  79         if (pcb_data->total - pcb_data->count > CB_READ_LEN)
  80                 frames = CB_READ_LEN / pcb_data->channels ;
  81         else
  82                 frames = (pcb_data->total - pcb_data->count) / pcb_data->channels ;
  83
  84         *data = pcb_data->data + pcb_data->count ;
  85         pcb_data->count += frames ;
  86
  87         return frames ;
  88 } /* test_callback_func */
  89
  90
  91 static void
  92 callback_test (int converter, double src_ratio)
  93 {       static TEST_CB_DATA test_callback_data ;
  94         static float output [BUFFER_LEN] ;
  95
  96         SRC_STATE       *src_state ;
  97
  98         long    read_count, read_total ;
  99         int     error ;
 100
 101         printf ("\tcallback_test    (SRC ratio = %6.4f) ........... ", src_ratio) ;
 102         fflush (stdout) ;
 103
 104         test_callback_data.channels = 2 ;
 105         test_callback_data.count = 0 ;
 106         test_callback_data.end_of_data = 0 ;
 107         test_callback_data.total = ARRAY_LEN (test_callback_data.data) ;
 108
 109         if ((src_state = src_callback_new (test_callback_func, converter, test_callback_data.channels, &error, &test_callback_data)) == NULL)
 110         {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
 111                 exit (1) ;
 112                 } ;
 113
 114         read_total = 0 ;
 115         do
 116         {       /* We will be throwing away output data, so just grab as much as possible. */
 117                 read_count = ARRAY_LEN (output) / test_callback_data.channels ;
 118                 read_count = src_callback_read (src_state, src_ratio, read_count, output) ;
 119                 read_total += read_count ;
 120                 }
 121         while (read_count > 0) ;
 122
 123         if ((error = src_error (src_state)) != 0)
 124         {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
 125                 exit (1) ;
 126                 } ;
 127
 128         src_state = src_delete (src_state) ;
 129
 130         if (fabs (read_total / src_ratio - ARRAY_LEN (test_callback_data.data)) > 2.0)
 131         {       printf ("\n\nLine %d : input / output length mismatch.\n\n", __LINE__) ;
 132                 printf ("    input len  : %d\n", ARRAY_LEN (test_callback_data.data)) ;
 133                 printf ("    output len : %ld (should be %g +/- 2)\n\n", read_total,
 134                                         floor (0.5 + src_ratio * ARRAY_LEN (test_callback_data.data))) ;
 135                 exit (1) ;
 136                 } ;
 137
 138         puts ("ok") ;
 139
 140         return ;
 141 } /* callback_test */
 142
 143 /*=====================================================================================
 144 */
 145
 146 static long
 147 eos_callback_func (void *cb_data, float **data)
 148 {
 149         TEST_CB_DATA *pcb_data ;
 150         long frames ;
 151
 152         if (data == NULL)
 153                 return 0 ;
 154
 155         if ((pcb_data = cb_data) == NULL)
 156                 return 0 ;
 157
 158         /*
 159         **      Return immediately if there is no more data.
 160         **      In this case, the output pointer 'data' will not be set and
 161         **      valgrind should not warn about it.
 162         */
 163         if (pcb_data->end_of_data)
 164                 return 0 ;
 165
 166         if (pcb_data->total - pcb_data->count > CB_READ_LEN)
 167                 frames = CB_READ_LEN / pcb_data->channels ;
 168         else
 169                 frames = (pcb_data->total - pcb_data->count) / pcb_data->channels ;
 170
 171         *data = pcb_data->data + pcb_data->count ;
 172         pcb_data->count += frames ;
 173
 174         /*
 175         **      Set end_of_data so that the next call to the callback function will
 176         **      return zero ocunt without setting the 'data' pointer.
 177         */
 178         if (pcb_data->total < 2 * pcb_data->count)
 179                 pcb_data->end_of_data = 1 ;
 180
 181         return frames ;
 182 } /* eos_callback_data */
 183
 184
 185 static void
 186 end_of_stream_test (int converter)
 187 {       static TEST_CB_DATA test_callback_data ;
 188         static float output [BUFFER_LEN] ;
 189
 190         SRC_STATE       *src_state ;
 191
 192         double  src_ratio = 0.3 ;
 193         long    read_count, read_total ;
 194         int     error ;
 195
 196         printf ("\t%-30s        ........... ", src_get_name (converter)) ;
 197         fflush (stdout) ;
 198
 199         test_callback_data.channels = 2 ;
 200         test_callback_data.count = 0 ;
 201         test_callback_data.end_of_data = 0 ;
 202         test_callback_data.total = ARRAY_LEN (test_callback_data.data) ;
 203
 204         if ((src_state = src_callback_new (eos_callback_func, converter, test_callback_data.channels, &error, &test_callback_data)) == NULL)
 205         {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
 206                 exit (1) ;
 207                 } ;
 208
 209         read_total = 0 ;
 210         do
 211         {       /* We will be throwing away output data, so just grab as much as possible. */
 212                 read_count = ARRAY_LEN (output) / test_callback_data.channels ;
 213                 read_count = src_callback_read (src_state, src_ratio, read_count, output) ;
 214                 read_total += read_count ;
 215                 }
 216         while (read_count > 0) ;
 217
 218         if ((error = src_error (src_state)) != 0)
 219         {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
 220                 exit (1) ;
 221                 } ;
 222
 223         src_state = src_delete (src_state) ;
 224
 225         if (test_callback_data.end_of_data == 0)
 226         {       printf ("\n\nLine %d : test_callback_data.end_of_data should not be 0."
 227                                 " This is a bug in the test.\n\n", __LINE__) ;
 228                 exit (1) ;
 229                 } ;
 230
 231         puts ("ok") ;
 232         return ;
 233 } /* end_of_stream_test */