ref: 06a021bb7ab5a85975a6e27b7cc5255768df3666
dir: libsamplerate/tests/varispeed_test.c
/*
** Copyright (c) 2006-2016, 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 "src_config.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <samplerate.h>
#include "util.h"
#if HAVE_FFTW3
#include <fftw3.h>
#else
#define fftw_cleanup()
#endif
#define BUFFER_LEN (1 << 14)
static void varispeed_test (int converter, double target_snr) ;
static void varispeed_bounds_test (int converter) ;
static void set_ratio_test (int converter, int channels, double initial_ratio, double second_ratio) ;
int
main (void)
{
puts ("\n Varispeed SNR test") ;
printf (" Zero Order Hold interpolator : ") ;
fflush (stdout) ;
varispeed_test (SRC_ZERO_ORDER_HOLD, 10.0) ;
puts ("ok") ;
printf (" Linear interpolator : ") ;
fflush (stdout) ;
varispeed_test (SRC_LINEAR, 10.0) ;
puts ("ok") ;
printf (" Sinc interpolator : ") ;
fflush (stdout) ;
varispeed_test (SRC_SINC_FASTEST, 115.0) ;
puts ("ok") ;
puts ("\n Varispeed bounds test") ;
printf (" Zero Order Hold interpolator : ") ;
fflush (stdout) ;
varispeed_bounds_test (SRC_ZERO_ORDER_HOLD) ;
puts ("ok") ;
printf (" Linear interpolator : ") ;
fflush (stdout) ;
varispeed_bounds_test (SRC_LINEAR) ;
puts ("ok") ;
printf (" Sinc interpolator : ") ;
fflush (stdout) ;
varispeed_bounds_test (SRC_SINC_FASTEST) ;
puts ("ok") ;
fftw_cleanup () ;
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) ;
} ;
return ;
} /* varispeed_test */
static void
varispeed_bounds_test (int converter)
{ double ratios [] = { 0.1, 0.01, 20 } ;
int chan, r1, r2 ;
for (chan = 1 ; chan <= 9 ; chan ++)
for (r1 = 0 ; r1 < ARRAY_LEN (ratios) ; r1++)
for (r2 = 0 ; r2 < ARRAY_LEN (ratios) ; r2 ++)
if (r1 != r2)
set_ratio_test (converter, chan, ratios [r1], ratios [r2]) ;
} /* varispeed_bounds_test */
static void
set_ratio_test (int converter, int channels, double initial_ratio, double second_ratio)
{ const int total_input_frames = BUFFER_LEN ;
/* Maximum upsample ratio is 20, use a value beigger. */
const int total_output_frames = 25 * BUFFER_LEN ;
/* Interested in array boundary conditions, so all zero data here is fine. */
float *input = calloc (total_input_frames * channels, sizeof (float)) ;
float *output = calloc (total_output_frames * channels, sizeof (float)) ;
char details [128] ;
const int max_loop_count = 100000 ;
const int chunk_size = 128 ;
SRC_STATE *src_state ;
SRC_DATA src_data ;
int error, k, total_frames_used, total_frames_gen ;
snprintf (details, sizeof (details), "%d channels, ratio %g -> %g", channels, initial_ratio, second_ratio) ;
if ((src_state = src_new (converter, channels, &error)) == NULL)
{ printf ("\n\nLine %d : src_new () failed : %s\n\n", __LINE__, src_strerror (error)) ;
exit (1) ;
} ;
total_frames_used = 0 ;
total_frames_gen = 0 ;
memset (&src_data, 0, sizeof (src_data)) ;
src_data.end_of_input = 0 ;
src_data.src_ratio = initial_ratio ;
src_data.data_in = input ;
src_data.data_out = output ;
src_data.input_frames = chunk_size ;
src_data.output_frames = total_output_frames ;
/* Use a max_loop_count here to enable the detection of infinite loops
** (due to end of input not being detected.
*/
for (k = 0 ; k < max_loop_count ; k ++)
{ if (k == 1)
{ /* Hard switch to second_ratio after processing one chunk. */
src_data.src_ratio = second_ratio ;
if ((error = src_set_ratio (src_state, second_ratio)))
{ printf ("\n\nLine %d : %s : %s\n\n", __LINE__, details, src_strerror (error)) ;
exit (1) ;
} ;
} ;
if ((error = src_process (src_state, &src_data)) != 0)
{ printf ("\n\nLine %d : %s : %s\n\n", __LINE__, details, src_strerror (error)) ;
exit (1) ;
} ;
if (src_data.end_of_input && src_data.output_frames_gen == 0)
break ;
total_frames_used += src_data.input_frames_used ;
total_frames_gen += src_data.output_frames_gen ;
src_data.data_in += src_data.input_frames_used * channels ;
src_data.data_out += src_data.output_frames_gen * channels ;
src_data.input_frames = total_input_frames - total_frames_used ;
src_data.output_frames = total_output_frames - total_frames_gen ;
src_data.end_of_input = total_frames_used >= total_input_frames ? 1 : 0 ;
} ;
ASSERT (k < max_loop_count) ;
ASSERT (total_frames_gen > 0) ;
for (k = 0 ; k < total_frames_gen * channels ; k ++)
ASSERT (! isnan (output [k])) ;
src_state = src_delete (src_state) ;
free (input) ;
free (output) ;
return ;
} /* set_ratio_test */