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/*
** Copyright (c) 2002-2016, 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <samplerate.h>
#include "util.h"
#define BUFFER_LEN 2048
static void simple_test (int converter, double ratio) ;
static void src_simple_produces_output (int converter, int channels, double src_ratio) ;
static void src_simple_produces_output_test (int converter, double src_ratio) ;
int
main (void)
{ static double src_ratios [] =
{ 1.0001, 0.099, 0.1, 0.33333333, 0.789, 1.9, 3.1, 9.9, 256.0, 1.0 / 256.0
} ;
int k ;
puts ("") ;
puts (" Zero Order Hold interpolator :") ;
for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
{ simple_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
src_simple_produces_output_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
}
puts (" Linear interpolator :") ;
for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
{ simple_test (SRC_LINEAR, src_ratios [k]) ;
src_simple_produces_output_test (SRC_LINEAR, src_ratios [k]) ;
}
#ifdef ENABLE_SINC_FAST_CONVERTER
puts (" Sinc interpolator :") ;
for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
{ simple_test (SRC_SINC_FASTEST, src_ratios [k]) ;
src_simple_produces_output_test (SRC_SINC_FASTEST, src_ratios [k]) ;
}
#endif
puts ("") ;
return 0 ;
} /* main */
static void
src_simple_produces_output_test (int converter, double src_ratio)
{
for (int channels = 1; channels <= 9; channels++)
src_simple_produces_output(converter, channels, src_ratio);
}
static void
src_simple_produces_output (int converter, int channels, double src_ratio)
{
// Choose a suitable number of frames.
// At least 256 so a conversion ratio of 1/256 can produce any output
const long NUM_FRAMES = 1000;
int error;
printf ("\tproduces_output\t(SRC ratio = %6.4f, channels = %d) ... ", src_ratio, channels) ;
fflush (stdout) ;
float *input = calloc (NUM_FRAMES * channels, sizeof (float));
float *output = calloc (NUM_FRAMES * channels, sizeof (float));
SRC_DATA src_data;
memset (&src_data, 0, sizeof (src_data)) ;
src_data.data_in = input;
src_data.data_out = output;
src_data.input_frames = NUM_FRAMES;
src_data.output_frames = NUM_FRAMES;
src_data.src_ratio = src_ratio;
if ((error = src_simple (&src_data, converter, channels)))
{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
exit (1) ;
} ;
if (src_data.input_frames_used == 0)
{ printf ("\n\nLine %d : No input frames used.\n\n", __LINE__) ;
exit (1) ;
} ;
if (src_data.output_frames_gen == 0)
{ printf ("\n\nLine %d : No output frames generated.\n\n", __LINE__) ;
exit (1) ;
} ;
free(input);
free(output);
puts ("ok") ;
}
static void
simple_test (int converter, double src_ratio)
{ static float input [BUFFER_LEN], output [BUFFER_LEN] ;
SRC_DATA src_data ;
int input_len, output_len, error, terminate ;
printf ("\tsimple_test\t(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) ;
} ;
memset (&src_data, 0, sizeof (src_data)) ;
src_data.data_in = input ;
src_data.input_frames = input_len ;
src_data.src_ratio = src_ratio ;
src_data.data_out = output ;
src_data.output_frames = BUFFER_LEN ;
if ((error = src_simple (&src_data, converter, 1)))
{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
exit (1) ;
} ;
terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;
if (fabs (src_data.output_frames_gen - src_ratio * input_len) > 2 * terminate)
{ printf ("\n\nLine %d : bad output data length %ld should be %d.\n", __LINE__,
src_data.output_frames_gen, (int) floor (src_ratio * input_len)) ;
printf ("\tsrc_ratio : %.4f\n", src_ratio) ;
printf ("\tinput_len : %d\n\toutput_len : %d\n\n", input_len, output_len) ;
exit (1) ;
} ;
puts ("ok") ;
return ;
} /* simple_test */
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