ref: 06a021bb7ab5a85975a6e27b7cc5255768df3666
dir: libsamplerate/tests/callback_test.c
/*
** Copyright (c) 2003-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <samplerate.h>
#include "util.h"
#define BUFFER_LEN 10000
#define CB_READ_LEN 256
static void callback_test (int converter, double ratio) ;
static void end_of_stream_test (int converter) ;
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 ("") ;
puts (" End of stream test :") ;
end_of_stream_test (SRC_ZERO_ORDER_HOLD) ;
end_of_stream_test (SRC_LINEAR) ;
end_of_stream_test (SRC_SINC_FASTEST) ;
puts ("") ;
return 0 ;
} /* main */
/*=====================================================================================
*/
typedef struct
{ int channels ;
long count, total ;
int end_of_data ;
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 / pcb_data->channels ;
else
frames = (pcb_data->total - pcb_data->count) / pcb_data->channels ;
*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 error ;
printf ("\tcallback_test (SRC ratio = %6.4f) ........... ", src_ratio) ;
fflush (stdout) ;
test_callback_data.channels = 2 ;
test_callback_data.count = 0 ;
test_callback_data.end_of_data = 0 ;
test_callback_data.total = ARRAY_LEN (test_callback_data.data) ;
if ((src_state = src_callback_new (test_callback_func, converter, test_callback_data.channels, &error, &test_callback_data)) == NULL)
{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
exit (1) ;
} ;
read_total = 0 ;
do
{ /* We will be throwing away output data, so just grab as much as possible. */
read_count = ARRAY_LEN (output) / test_callback_data.channels ;
read_count = src_callback_read (src_state, src_ratio, read_count, output) ;
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 - ARRAY_LEN (test_callback_data.data)) > 2.0)
{ printf ("\n\nLine %d : input / output length mismatch.\n\n", __LINE__) ;
printf (" input len : %d\n", ARRAY_LEN (test_callback_data.data)) ;
printf (" output len : %ld (should be %g +/- 2)\n\n", read_total,
floor (0.5 + src_ratio * ARRAY_LEN (test_callback_data.data))) ;
exit (1) ;
} ;
puts ("ok") ;
return ;
} /* callback_test */
/*=====================================================================================
*/
static long
eos_callback_func (void *cb_data, float **data)
{
TEST_CB_DATA *pcb_data ;
long frames ;
if (data == NULL)
return 0 ;
if ((pcb_data = cb_data) == NULL)
return 0 ;
/*
** Return immediately if there is no more data.
** In this case, the output pointer 'data' will not be set and
** valgrind should not warn about it.
*/
if (pcb_data->end_of_data)
return 0 ;
if (pcb_data->total - pcb_data->count > CB_READ_LEN)
frames = CB_READ_LEN / pcb_data->channels ;
else
frames = (pcb_data->total - pcb_data->count) / pcb_data->channels ;
*data = pcb_data->data + pcb_data->count ;
pcb_data->count += frames ;
/*
** Set end_of_data so that the next call to the callback function will
** return zero ocunt without setting the 'data' pointer.
*/
if (pcb_data->total < 2 * pcb_data->count)
pcb_data->end_of_data = 1 ;
return frames ;
} /* eos_callback_data */
static void
end_of_stream_test (int converter)
{ static TEST_CB_DATA test_callback_data ;
static float output [BUFFER_LEN] ;
SRC_STATE *src_state ;
double src_ratio = 0.3 ;
long read_count, read_total ;
int error ;
printf ("\t%-30s ........... ", src_get_name (converter)) ;
fflush (stdout) ;
test_callback_data.channels = 2 ;
test_callback_data.count = 0 ;
test_callback_data.end_of_data = 0 ;
test_callback_data.total = ARRAY_LEN (test_callback_data.data) ;
if ((src_state = src_callback_new (eos_callback_func, converter, test_callback_data.channels, &error, &test_callback_data)) == NULL)
{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
exit (1) ;
} ;
read_total = 0 ;
do
{ /* We will be throwing away output data, so just grab as much as possible. */
read_count = ARRAY_LEN (output) / test_callback_data.channels ;
read_count = src_callback_read (src_state, src_ratio, read_count, output) ;
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 (test_callback_data.end_of_data == 0)
{ printf ("\n\nLine %d : test_callback_data.end_of_data should not be 0."
" This is a bug in the test.\n\n", __LINE__) ;
exit (1) ;
} ;
puts ("ok") ;
return ;
} /* end_of_stream_test */