ref: 06a021bb7ab5a85975a6e27b7cc5255768df3666
dir: libsamplerate/tests/src-evaluate.c
/*
** 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include "src_config.h"
#if (HAVE_FFTW3 && HAVE_SNDFILE && HAVE_SYS_TIMES_H)
#include <time.h>
#include <sys/times.h>
#include <sndfile.h>
#include <math.h>
#include <sys/utsname.h>
#include "util.h"
#define MAX_FREQS 4
#define BUFFER_LEN 80000
#define SAFE_STRNCAT(dest,src,len) \
{ int safe_strncat_count ; \
safe_strncat_count = (len) - strlen (dest) - 1 ; \
strncat ((dest), (src), safe_strncat_count) ; \
(dest) [(len) - 1] = 0 ; \
} ;
typedef struct
{ int freq_count ;
double freqs [MAX_FREQS] ;
int output_samplerate ;
int pass_band_peaks ;
double peak_value ;
} SNR_TEST ;
typedef struct
{ const char *progname ;
const char *version_cmd ;
const char *version_start ;
const char *convert_cmd ;
int format ;
} RESAMPLE_PROG ;
static char *get_progname (char *) ;
static void usage_exit (const char *, const RESAMPLE_PROG *prog, int count) ;
static void measure_program (const RESAMPLE_PROG *prog, int verbose) ;
static void generate_source_wav (const char *filename, const double *freqs, int freq_count, int format) ;
static const char* get_machine_details (void) ;
static char version_string [512] ;
int
main (int argc, char *argv [])
{ static RESAMPLE_PROG resample_progs [] =
{ { "sndfile-resample",
"examples/sndfile-resample --version",
"libsamplerate",
"examples/sndfile-resample --max-speed -c 0 -to %d source.wav destination.wav",
SF_FORMAT_WAV | SF_FORMAT_PCM_32
},
{ "sox",
"sox -h 2>&1",
"sox",
"sox source.wav -r %d destination.wav resample 0.835",
SF_FORMAT_WAV | SF_FORMAT_PCM_32
},
{ "ResampAudio",
"ResampAudio --version",
"ResampAudio",
"ResampAudio -f cutoff=0.41,atten=100,ratio=128 -s %d source.wav destination.wav",
SF_FORMAT_WAV | SF_FORMAT_PCM_32
},
/*-
{ /+*
** The Shibatch converter doesn't work for all combinations of
** source and destination sample rates. Therefore it can't be
** included in this test.
*+/
"shibatch",
"ssrc",
"Shibatch",
"ssrc --rate %d source.wav destination.wav",
SF_FORMAT_WAV | SF_FORMAT_PCM_32
},-*/
/*-
{ /+*
** The resample program is not able to match the bandwidth and SNR
** specs or sndfile-resample and hence will not be tested.
*+/
"resample",
"resample -version",
"resample",
"resample -to %d source.wav destination.wav",
SF_FORMAT_WAV | SF_FORMAT_FLOAT
},-*/
/*-
{ "mplayer",
"mplayer -v 2>&1",
"MPlayer ",
"mplayer -ao pcm -srate %d source.wav >/dev/null 2>&1 && mv audiodump.wav destination.wav",
SF_FORMAT_WAV | SF_FORMAT_PCM_32
},-*/
} ; /* resample_progs */
char *progname ;
int prog = 0, verbose = 0 ;
progname = get_progname (argv [0]) ;
printf ("\n %s : evaluate a sample rate converter.\n", progname) ;
if (argc == 3 && strcmp ("--verbose", argv [1]) == 0)
{ verbose = 1 ;
prog = atoi (argv [2]) ;
}
else if (argc == 2)
{ verbose = 0 ;
prog = atoi (argv [1]) ;
}
else
usage_exit (progname, resample_progs, ARRAY_LEN (resample_progs)) ;
if (prog < 0 || prog >= ARRAY_LEN (resample_progs))
usage_exit (progname, resample_progs, ARRAY_LEN (resample_progs)) ;
measure_program (& (resample_progs [prog]), verbose) ;
puts ("") ;
return 0 ;
} /* main */
/*==============================================================================
*/
static char *
get_progname (char *progname)
{ char *cptr ;
if ((cptr = strrchr (progname, '/')) != NULL)
progname = cptr + 1 ;
if ((cptr = strrchr (progname, '\\')) != NULL)
progname = cptr + 1 ;
return progname ;
} /* get_progname */
static void
usage_exit (const char *progname, const RESAMPLE_PROG *prog, int count)
{ int k ;
printf ("\n Usage : %s <number>\n\n", progname) ;
puts (" where <number> specifies the program to test:\n") ;
for (k = 0 ; k < count ; k++)
printf (" %d : %s\n", k, prog [k].progname) ;
puts ("\n"
" Obviously to test a given program you have to have it available on\n"
" your system. See http://libsndfile.github.io/libsamplerate/quality.html for\n"
" the download location of these programs.\n") ;
exit (1) ;
} /* usage_exit */
static const char*
get_machine_details (void)
{ static char namestr [262] ;
struct utsname name ;
if (uname (&name) != 0)
{ snprintf (namestr, sizeof (namestr), "Unknown") ;
return namestr ;
} ;
snprintf (namestr, sizeof (namestr), "%s (%s %s %s)", name.nodename,
name.machine, name.sysname, name.release) ;
return namestr ;
} /* get_machine_details */
/*==============================================================================
*/
static void
get_version_string (const RESAMPLE_PROG *prog)
{ FILE *file ;
char *cptr ;
/* Default. */
snprintf (version_string, sizeof (version_string), "no version") ;
if (prog->version_cmd == NULL)
return ;
if ((file = popen (prog->version_cmd, "r")) == NULL)
return ;
while ((cptr = fgets (version_string, sizeof (version_string), file)) != NULL)
{
if (strstr (cptr, prog->version_start) != NULL)
break ;
version_string [0] = 0 ;
} ;
pclose (file) ;
/* Remove trailing newline. */
if ((cptr = strchr (version_string, '\n')) != NULL)
cptr [0] = 0 ;
/* Remove leading whitespace from version string. */
cptr = version_string ;
while (cptr [0] != 0 && isspace (cptr [0]))
cptr ++ ;
if (cptr != version_string)
{ strncpy (version_string, cptr, sizeof (version_string) - 1) ;
version_string [sizeof (version_string) - 1] = 0 ;
} ;
return ;
} /* get_version_string */
static void
generate_source_wav (const char *filename, const double *freqs, int freq_count, int format)
{ static float buffer [BUFFER_LEN] ;
SNDFILE *sndfile ;
SF_INFO sfinfo ;
sfinfo.channels = 1 ;
sfinfo.samplerate = 44100 ;
sfinfo.format = format ;
if ((sndfile = sf_open (filename, SFM_WRITE, &sfinfo)) == NULL)
{ printf ("Line %d : cound not open '%s' : %s\n", __LINE__, filename, sf_strerror (NULL)) ;
exit (1) ;
} ;
sf_command (sndfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ;
gen_windowed_sines (freq_count, freqs, 0.9, buffer, ARRAY_LEN (buffer)) ;
if (sf_write_float (sndfile, buffer, ARRAY_LEN (buffer)) != ARRAY_LEN (buffer))
{ printf ("Line %d : sf_write_float short write.\n", __LINE__) ;
exit (1) ;
} ;
sf_close (sndfile) ;
} /* generate_source_wav */
static double
measure_destination_wav (char *filename, int *output_samples, int expected_peaks)
{ static float buffer [250000] ;
SNDFILE *sndfile ;
SF_INFO sfinfo ;
double snr ;
if ((sndfile = sf_open (filename, SFM_READ, &sfinfo)) == NULL)
{ printf ("Line %d : Cound not open '%s' : %s\n", __LINE__, filename, sf_strerror (NULL)) ;
exit (1) ;
} ;
if (sfinfo.channels != 1)
{ printf ("Line %d : Bad channel count (%d). Should be 1.\n", __LINE__, sfinfo.channels) ;
exit (1) ;
} ;
if (sfinfo.frames > ARRAY_LEN (buffer))
{ printf ("Line %d : Too many frames (%ld) of data in file.\n", __LINE__, (long) sfinfo.frames) ;
exit (1) ;
} ;
*output_samples = (int) sfinfo.frames ;
if (sf_read_float (sndfile, buffer, sfinfo.frames) != sfinfo.frames)
{ printf ("Line %d : Bad read.\n", __LINE__) ;
exit (1) ;
} ;
sf_close (sndfile) ;
snr = calculate_snr (buffer, sfinfo.frames, expected_peaks) ;
return snr ;
} /* measure_desination_wav */
static double
measure_snr (const RESAMPLE_PROG *prog, int *output_samples, int verbose)
{ static SNR_TEST snr_test [] =
{
{ 1, { 0.211111111111 }, 48000, 1, 1.0 },
{ 1, { 0.011111111111 }, 132301, 1, 1.0 },
{ 1, { 0.111111111111 }, 92301, 1, 1.0 },
{ 1, { 0.011111111111 }, 26461, 1, 1.0 },
{ 1, { 0.011111111111 }, 13231, 1, 1.0 },
{ 1, { 0.011111111111 }, 44101, 1, 1.0 },
{ 2, { 0.311111, 0.49 }, 78199, 2, 1.0 },
{ 2, { 0.011111, 0.49 }, 12345, 1, 0.5 },
{ 2, { 0.0123456, 0.4 }, 20143, 1, 0.5 },
{ 2, { 0.0111111, 0.4 }, 26461, 1, 0.5 },
{ 1, { 0.381111111111 }, 58661, 1, 1.0 }
} ; /* snr_test */
static char command [256] ;
double snr, worst_snr = 500.0 ;
int k , retval, sample_count ;
*output_samples = 0 ;
for (k = 0 ; k < ARRAY_LEN (snr_test) ; k++)
{ remove ("source.wav") ;
remove ("destination.wav") ;
if (verbose)
printf (" SNR test #%d : ", k) ;
fflush (stdout) ;
generate_source_wav ("source.wav", snr_test [k].freqs, snr_test [k].freq_count, prog->format) ;
snprintf (command, sizeof (command), prog->convert_cmd, snr_test [k].output_samplerate) ;
SAFE_STRNCAT (command, " >/dev/null 2>&1", sizeof (command)) ;
if ((retval = system (command)) != 0)
printf ("system returned %d\n", retval) ;
snr = measure_destination_wav ("destination.wav", &sample_count, snr_test->pass_band_peaks) ;
*output_samples += sample_count ;
if (fabs (snr) < fabs (worst_snr))
worst_snr = fabs (snr) ;
if (verbose)
printf ("%6.2f dB\n", snr) ;
} ;
return worst_snr ;
} /* measure_snr */
/*------------------------------------------------------------------------------
*/
static double
measure_destination_peak (const char *filename)
{ static float data [2 * BUFFER_LEN] ;
SNDFILE *sndfile ;
SF_INFO sfinfo ;
double peak = 0.0 ;
int k = 0 ;
if ((sndfile = sf_open (filename, SFM_READ, &sfinfo)) == NULL)
{ printf ("Line %d : failed to open file %s\n", __LINE__, filename) ;
exit (1) ;
} ;
if (sfinfo.channels != 1)
{ printf ("Line %d : bad channel count.\n", __LINE__) ;
exit (1) ;
} ;
if (sfinfo.frames > ARRAY_LEN (data) + 4 || sfinfo.frames < ARRAY_LEN (data) - 100)
{ printf ("Line %d : bad frame count (got %d, expected %d).\n", __LINE__, (int) sfinfo.frames, ARRAY_LEN (data)) ;
exit (1) ;
} ;
if (sf_read_float (sndfile, data, sfinfo.frames) != sfinfo.frames)
{ printf ("Line %d : bad read.\n", __LINE__) ;
exit (1) ;
} ;
sf_close (sndfile) ;
for (k = 0 ; k < (int) sfinfo.frames ; k++)
if (fabs (data [k]) > peak)
peak = fabs (data [k]) ;
return peak ;
} /* measure_destination_peak */
static double
find_attenuation (double freq, const RESAMPLE_PROG *prog, int verbose)
{ static char command [256] ;
double output_peak ;
int retval ;
char *filename ;
filename = "destination.wav" ;
generate_source_wav ("source.wav", &freq, 1, prog->format) ;
remove (filename) ;
snprintf (command, sizeof (command), prog->convert_cmd, 88189) ;
SAFE_STRNCAT (command, " >/dev/null 2>&1", sizeof (command)) ;
if ((retval = system (command)) != 0)
printf ("system returned %d\n", retval) ;
output_peak = measure_destination_peak (filename) ;
if (verbose)
printf (" freq : %f peak : %f\n", freq, output_peak) ;
return fabs (20.0 * log10 (output_peak)) ;
} /* find_attenuation */
static double
bandwidth_test (const RESAMPLE_PROG *prog, int verbose)
{ double f1, f2, a1, a2 ;
double freq, atten ;
f1 = 0.35 ;
a1 = find_attenuation (f1, prog, verbose) ;
f2 = 0.49999 ;
a2 = find_attenuation (f2, prog, verbose) ;
if (fabs (a1) < 1e-2 && a2 < 3.0)
return -1.0 ;
if (a1 > 3.0 || a2 < 3.0)
{ printf ("\n\nLine %d : cannot bracket 3dB point.\n\n", __LINE__) ;
exit (1) ;
} ;
while (a2 - a1 > 1.0)
{ freq = f1 + 0.5 * (f2 - f1) ;
atten = find_attenuation (freq, prog, verbose) ;
if (atten < 3.0)
{ f1 = freq ;
a1 = atten ;
}
else
{ f2 = freq ;
a2 = atten ;
} ;
} ;
freq = f1 + (3.0 - a1) * (f2 - f1) / (a2 - a1) ;
return 200.0 * freq ;
} /* bandwidth_test */
static void
measure_program (const RESAMPLE_PROG *prog, int verbose)
{ double snr, bandwidth, conversion_rate ;
int output_samples ;
struct tms time_data ;
time_t time_now ;
printf ("\n Machine : %s\n", get_machine_details ()) ;
time_now = time (NULL) ;
printf (" Date : %s", ctime (&time_now)) ;
get_version_string (prog) ;
printf (" Program : %s\n", version_string) ;
printf (" Command : %s\n\n", prog->convert_cmd) ;
snr = measure_snr (prog, &output_samples, verbose) ;
printf (" Worst case SNR : %6.2f dB\n", snr) ;
times (&time_data) ;
conversion_rate = (1.0 * output_samples * sysconf (_SC_CLK_TCK)) / time_data.tms_cutime ;
printf (" Conversion rate : %5.0f samples/sec\n", conversion_rate) ;
bandwidth = bandwidth_test (prog, verbose) ;
if (bandwidth > 0.0)
printf (" Measured bandwidth : %5.2f %%\n", bandwidth) ;
else
printf (" Could not measure bandwidth (no -3dB point found).\n") ;
return ;
} /* measure_program */
/*##############################################################################
*/
#else
int
main (void)
{ puts ("\n"
"****************************************************************\n"
" This program has been compiled without :\n"
" 1) FFTW (http://www.fftw.org/).\n"
" 2) libsndfile (http://www.zip.com.au/~erikd/libsndfile/).\n"
" Without these two libraries there is not much it can do.\n"
"****************************************************************\n") ;
return 0 ;
} /* main */
#endif /* (HAVE_FFTW3 && HAVE_SNDFILE) */