Emeric Vigier | eebea67 | 2012-08-06 17:36:30 -0400 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com> |
| 3 | ** |
| 4 | ** This program is free software; you can redistribute it and/or modify |
| 5 | ** it under the terms of the GNU General Public License as published by |
| 6 | ** the Free Software Foundation; either version 2 of the License, or |
| 7 | ** (at your option) any later version. |
| 8 | ** |
| 9 | ** This program is distributed in the hope that it will be useful, |
| 10 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | ** GNU General Public License for more details. |
| 13 | ** |
| 14 | ** You should have received a copy of the GNU General Public License |
| 15 | ** along with this program; if not, write to the Free Software |
| 16 | ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <unistd.h> |
| 22 | #include <string.h> |
| 23 | #include <ctype.h> |
| 24 | |
| 25 | #include "config.h" |
| 26 | |
| 27 | #if (HAVE_FFTW3 && HAVE_SNDFILE && HAVE_SYS_TIMES_H) |
| 28 | |
| 29 | #include <time.h> |
| 30 | #include <sys/times.h> |
| 31 | |
| 32 | #include <sndfile.h> |
| 33 | #include <math.h> |
| 34 | #include <sys/utsname.h> |
| 35 | |
| 36 | #include "util.h" |
| 37 | |
| 38 | #define MAX_FREQS 4 |
| 39 | #define BUFFER_LEN 80000 |
| 40 | |
| 41 | #define SAFE_STRNCAT(dest,src,len) \ |
| 42 | { int safe_strncat_count ; \ |
| 43 | safe_strncat_count = (len) - strlen (dest) - 1 ; \ |
| 44 | strncat ((dest), (src), safe_strncat_count) ; \ |
| 45 | (dest) [(len) - 1] = 0 ; \ |
| 46 | } ; |
| 47 | |
| 48 | typedef struct |
| 49 | { int freq_count ; |
| 50 | double freqs [MAX_FREQS] ; |
| 51 | |
| 52 | int output_samplerate ; |
| 53 | int pass_band_peaks ; |
| 54 | |
| 55 | double peak_value ; |
| 56 | } SNR_TEST ; |
| 57 | |
| 58 | typedef struct |
| 59 | { const char *progname ; |
| 60 | const char *version_cmd ; |
| 61 | const char *version_start ; |
| 62 | const char *convert_cmd ; |
| 63 | int format ; |
| 64 | } RESAMPLE_PROG ; |
| 65 | |
| 66 | static char *get_progname (char *) ; |
| 67 | static void usage_exit (const char *, const RESAMPLE_PROG *prog, int count) ; |
| 68 | static void measure_program (const RESAMPLE_PROG *prog, int verbose) ; |
| 69 | static void generate_source_wav (const char *filename, const double *freqs, int freq_count, int format) ; |
| 70 | static const char* get_machine_details (void) ; |
| 71 | |
| 72 | static char version_string [512] ; |
| 73 | |
| 74 | int |
| 75 | main (int argc, char *argv []) |
| 76 | { static RESAMPLE_PROG resample_progs [] = |
| 77 | { { "sndfile-resample", |
| 78 | "examples/sndfile-resample --version", |
| 79 | "libsamplerate", |
| 80 | "examples/sndfile-resample --max-speed -c 0 -to %d source.wav destination.wav", |
| 81 | SF_FORMAT_WAV | SF_FORMAT_PCM_32 |
| 82 | }, |
| 83 | { "sox", |
| 84 | "sox -h 2>&1", |
| 85 | "sox", |
| 86 | "sox source.wav -r %d destination.wav resample 0.835", |
| 87 | SF_FORMAT_WAV | SF_FORMAT_PCM_32 |
| 88 | }, |
| 89 | { "ResampAudio", |
| 90 | "ResampAudio --version", |
| 91 | "ResampAudio", |
| 92 | "ResampAudio -f cutoff=0.41,atten=100,ratio=128 -s %d source.wav destination.wav", |
| 93 | SF_FORMAT_WAV | SF_FORMAT_PCM_32 |
| 94 | }, |
| 95 | |
| 96 | /*- |
| 97 | { /+* |
| 98 | ** The Shibatch converter doesn't work for all combinations of |
| 99 | ** source and destination sample rates. Therefore it can't be |
| 100 | ** included in this test. |
| 101 | *+/ |
| 102 | "shibatch", |
| 103 | "ssrc", |
| 104 | "Shibatch", |
| 105 | "ssrc --rate %d source.wav destination.wav", |
| 106 | SF_FORMAT_WAV | SF_FORMAT_PCM_32 |
| 107 | },-*/ |
| 108 | |
| 109 | /*- |
| 110 | { /+* |
| 111 | ** The resample program is not able to match the bandwidth and SNR |
| 112 | ** specs or sndfile-resample and hence will not be tested. |
| 113 | *+/ |
| 114 | "resample", |
| 115 | "resample -version", |
| 116 | "resample", |
| 117 | "resample -to %d source.wav destination.wav", |
| 118 | SF_FORMAT_WAV | SF_FORMAT_FLOAT |
| 119 | },-*/ |
| 120 | |
| 121 | /*- |
| 122 | { "mplayer", |
| 123 | "mplayer -v 2>&1", |
| 124 | "MPlayer ", |
| 125 | "mplayer -ao pcm -srate %d source.wav >/dev/null 2>&1 && mv audiodump.wav destination.wav", |
| 126 | SF_FORMAT_WAV | SF_FORMAT_PCM_32 |
| 127 | },-*/ |
| 128 | |
| 129 | } ; /* resample_progs */ |
| 130 | |
| 131 | char *progname ; |
| 132 | int prog = 0, verbose = 0 ; |
| 133 | |
| 134 | progname = get_progname (argv [0]) ; |
| 135 | |
| 136 | printf ("\n %s : evaluate a sample rate converter.\n", progname) ; |
| 137 | |
| 138 | if (argc == 3 && strcmp ("--verbose", argv [1]) == 0) |
| 139 | { verbose = 1 ; |
| 140 | prog = atoi (argv [2]) ; |
| 141 | } |
| 142 | else if (argc == 2) |
| 143 | { verbose = 0 ; |
| 144 | prog = atoi (argv [1]) ; |
| 145 | } |
| 146 | else |
| 147 | usage_exit (progname, resample_progs, ARRAY_LEN (resample_progs)) ; |
| 148 | |
| 149 | if (prog < 0 || prog >= ARRAY_LEN (resample_progs)) |
| 150 | usage_exit (progname, resample_progs, ARRAY_LEN (resample_progs)) ; |
| 151 | |
| 152 | measure_program (& (resample_progs [prog]), verbose) ; |
| 153 | |
| 154 | puts ("") ; |
| 155 | |
| 156 | return 0 ; |
| 157 | } /* main */ |
| 158 | |
| 159 | /*============================================================================== |
| 160 | */ |
| 161 | |
| 162 | static char * |
| 163 | get_progname (char *progname) |
| 164 | { char *cptr ; |
| 165 | |
| 166 | if ((cptr = strrchr (progname, '/')) != NULL) |
| 167 | progname = cptr + 1 ; |
| 168 | |
| 169 | if ((cptr = strrchr (progname, '\\')) != NULL) |
| 170 | progname = cptr + 1 ; |
| 171 | |
| 172 | return progname ; |
| 173 | } /* get_progname */ |
| 174 | |
| 175 | static void |
| 176 | usage_exit (const char *progname, const RESAMPLE_PROG *prog, int count) |
| 177 | { int k ; |
| 178 | |
| 179 | printf ("\n Usage : %s <number>\n\n", progname) ; |
| 180 | |
| 181 | puts (" where <number> specifies the program to test:\n") ; |
| 182 | |
| 183 | for (k = 0 ; k < count ; k++) |
| 184 | printf (" %d : %s\n", k, prog [k].progname) ; |
| 185 | |
| 186 | puts ("\n" |
| 187 | " Obviously to test a given program you have to have it available on\n" |
| 188 | " your system. See http://www.mega-nerd.com/SRC/quality.html for\n" |
| 189 | " the download location of these programs.\n") ; |
| 190 | |
| 191 | exit (1) ; |
| 192 | } /* usage_exit */ |
| 193 | |
| 194 | static const char* |
| 195 | get_machine_details (void) |
| 196 | { static char namestr [256] ; |
| 197 | |
| 198 | struct utsname name ; |
| 199 | |
| 200 | if (uname (&name) != 0) |
| 201 | { snprintf (namestr, sizeof (namestr), "Unknown") ; |
| 202 | return namestr ; |
| 203 | } ; |
| 204 | |
| 205 | snprintf (namestr, sizeof (namestr), "%s (%s %s %s)", name.nodename, |
| 206 | name.machine, name.sysname, name.release) ; |
| 207 | |
| 208 | return namestr ; |
| 209 | } /* get_machine_details */ |
| 210 | |
| 211 | |
| 212 | /*============================================================================== |
| 213 | */ |
| 214 | |
| 215 | static void |
| 216 | get_version_string (const RESAMPLE_PROG *prog) |
| 217 | { FILE *file ; |
| 218 | char *cptr ; |
| 219 | |
| 220 | /* Default. */ |
| 221 | snprintf (version_string, sizeof (version_string), "no version") ; |
| 222 | |
| 223 | if (prog->version_cmd == NULL) |
| 224 | return ; |
| 225 | |
| 226 | if ((file = popen (prog->version_cmd, "r")) == NULL) |
| 227 | return ; |
| 228 | |
| 229 | while ((cptr = fgets (version_string, sizeof (version_string), file)) != NULL) |
| 230 | { |
| 231 | if (strstr (cptr, prog->version_start) != NULL) |
| 232 | break ; |
| 233 | |
| 234 | version_string [0] = 0 ; |
| 235 | } ; |
| 236 | |
| 237 | pclose (file) ; |
| 238 | |
| 239 | /* Remove trailing newline. */ |
| 240 | if ((cptr = strchr (version_string, '\n')) != NULL) |
| 241 | cptr [0] = 0 ; |
| 242 | |
| 243 | /* Remove leading whitespace from version string. */ |
| 244 | cptr = version_string ; |
| 245 | while (cptr [0] != 0 && isspace (cptr [0])) |
| 246 | cptr ++ ; |
| 247 | |
| 248 | if (cptr != version_string) |
| 249 | strncpy (version_string, cptr, sizeof (version_string)) ; |
| 250 | |
| 251 | return ; |
| 252 | } /* get_version_string */ |
| 253 | |
| 254 | static void |
| 255 | generate_source_wav (const char *filename, const double *freqs, int freq_count, int format) |
| 256 | { static float buffer [BUFFER_LEN] ; |
| 257 | |
| 258 | SNDFILE *sndfile ; |
| 259 | SF_INFO sfinfo ; |
| 260 | |
| 261 | sfinfo.channels = 1 ; |
| 262 | sfinfo.samplerate = 44100 ; |
| 263 | sfinfo.format = format ; |
| 264 | |
| 265 | if ((sndfile = sf_open (filename, SFM_WRITE, &sfinfo)) == NULL) |
| 266 | { printf ("Line %d : cound not open '%s' : %s\n", __LINE__, filename, sf_strerror (NULL)) ; |
| 267 | exit (1) ; |
| 268 | } ; |
| 269 | |
| 270 | sf_command (sndfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ; |
| 271 | |
| 272 | gen_windowed_sines (freq_count, freqs, 0.9, buffer, ARRAY_LEN (buffer)) ; |
| 273 | |
| 274 | if (sf_write_float (sndfile, buffer, ARRAY_LEN (buffer)) != ARRAY_LEN (buffer)) |
| 275 | { printf ("Line %d : sf_write_float short write.\n", __LINE__) ; |
| 276 | exit (1) ; |
| 277 | } ; |
| 278 | |
| 279 | sf_close (sndfile) ; |
| 280 | } /* generate_source_wav */ |
| 281 | |
| 282 | static double |
| 283 | measure_destination_wav (char *filename, int *output_samples, int expected_peaks) |
| 284 | { static float buffer [250000] ; |
| 285 | |
| 286 | SNDFILE *sndfile ; |
| 287 | SF_INFO sfinfo ; |
| 288 | double snr ; |
| 289 | |
| 290 | if ((sndfile = sf_open (filename, SFM_READ, &sfinfo)) == NULL) |
| 291 | { printf ("Line %d : Cound not open '%s' : %s\n", __LINE__, filename, sf_strerror (NULL)) ; |
| 292 | exit (1) ; |
| 293 | } ; |
| 294 | |
| 295 | if (sfinfo.channels != 1) |
| 296 | { printf ("Line %d : Bad channel count (%d). Should be 1.\n", __LINE__, sfinfo.channels) ; |
| 297 | exit (1) ; |
| 298 | } ; |
| 299 | |
| 300 | if (sfinfo.frames > ARRAY_LEN (buffer)) |
| 301 | { printf ("Line %d : Too many frames (%ld) of data in file.\n", __LINE__, (long) sfinfo.frames) ; |
| 302 | exit (1) ; |
| 303 | } ; |
| 304 | |
| 305 | *output_samples = (int) sfinfo.frames ; |
| 306 | |
| 307 | if (sf_read_float (sndfile, buffer, sfinfo.frames) != sfinfo.frames) |
| 308 | { printf ("Line %d : Bad read.\n", __LINE__) ; |
| 309 | exit (1) ; |
| 310 | } ; |
| 311 | |
| 312 | sf_close (sndfile) ; |
| 313 | |
| 314 | snr = calculate_snr (buffer, sfinfo.frames, expected_peaks) ; |
| 315 | |
| 316 | return snr ; |
| 317 | } /* measure_desination_wav */ |
| 318 | |
| 319 | static double |
| 320 | measure_snr (const RESAMPLE_PROG *prog, int *output_samples, int verbose) |
| 321 | { static SNR_TEST snr_test [] = |
| 322 | { |
| 323 | { 1, { 0.211111111111 }, 48000, 1, 1.0 }, |
| 324 | { 1, { 0.011111111111 }, 132301, 1, 1.0 }, |
| 325 | { 1, { 0.111111111111 }, 92301, 1, 1.0 }, |
| 326 | { 1, { 0.011111111111 }, 26461, 1, 1.0 }, |
| 327 | { 1, { 0.011111111111 }, 13231, 1, 1.0 }, |
| 328 | { 1, { 0.011111111111 }, 44101, 1, 1.0 }, |
| 329 | { 2, { 0.311111, 0.49 }, 78199, 2, 1.0 }, |
| 330 | { 2, { 0.011111, 0.49 }, 12345, 1, 0.5 }, |
| 331 | { 2, { 0.0123456, 0.4 }, 20143, 1, 0.5 }, |
| 332 | { 2, { 0.0111111, 0.4 }, 26461, 1, 0.5 }, |
| 333 | { 1, { 0.381111111111 }, 58661, 1, 1.0 } |
| 334 | } ; /* snr_test */ |
| 335 | static char command [256] ; |
| 336 | |
| 337 | double snr, worst_snr = 500.0 ; |
| 338 | int k , retval, sample_count ; |
| 339 | |
| 340 | *output_samples = 0 ; |
| 341 | |
| 342 | for (k = 0 ; k < ARRAY_LEN (snr_test) ; k++) |
| 343 | { remove ("source.wav") ; |
| 344 | remove ("destination.wav") ; |
| 345 | |
| 346 | if (verbose) |
| 347 | printf (" SNR test #%d : ", k) ; |
| 348 | fflush (stdout) ; |
| 349 | generate_source_wav ("source.wav", snr_test [k].freqs, snr_test [k].freq_count, prog->format) ; |
| 350 | |
| 351 | snprintf (command, sizeof (command), prog->convert_cmd, snr_test [k].output_samplerate) ; |
| 352 | SAFE_STRNCAT (command, " >/dev/null 2>&1", sizeof (command)) ; |
| 353 | if ((retval = system (command)) != 0) |
| 354 | printf ("system returned %d\n", retval) ; |
| 355 | |
| 356 | snr = measure_destination_wav ("destination.wav", &sample_count, snr_test->pass_band_peaks) ; |
| 357 | |
| 358 | *output_samples += sample_count ; |
| 359 | |
| 360 | if (fabs (snr) < fabs (worst_snr)) |
| 361 | worst_snr = fabs (snr) ; |
| 362 | |
| 363 | if (verbose) |
| 364 | printf ("%6.2f dB\n", snr) ; |
| 365 | } ; |
| 366 | |
| 367 | return worst_snr ; |
| 368 | } /* measure_snr */ |
| 369 | |
| 370 | /*------------------------------------------------------------------------------ |
| 371 | */ |
| 372 | |
| 373 | static double |
| 374 | measure_destination_peak (const char *filename) |
| 375 | { static float data [2 * BUFFER_LEN] ; |
| 376 | SNDFILE *sndfile ; |
| 377 | SF_INFO sfinfo ; |
| 378 | double peak = 0.0 ; |
| 379 | int k = 0 ; |
| 380 | |
| 381 | if ((sndfile = sf_open (filename, SFM_READ, &sfinfo)) == NULL) |
| 382 | { printf ("Line %d : failed to open file %s\n", __LINE__, filename) ; |
| 383 | exit (1) ; |
| 384 | } ; |
| 385 | |
| 386 | if (sfinfo.channels != 1) |
| 387 | { printf ("Line %d : bad channel count.\n", __LINE__) ; |
| 388 | exit (1) ; |
| 389 | } ; |
| 390 | |
| 391 | if (sfinfo.frames > ARRAY_LEN (data) + 4 || sfinfo.frames < ARRAY_LEN (data) - 100) |
| 392 | { printf ("Line %d : bad frame count (got %d, expected %d).\n", __LINE__, (int) sfinfo.frames, ARRAY_LEN (data)) ; |
| 393 | exit (1) ; |
| 394 | } ; |
| 395 | |
| 396 | if (sf_read_float (sndfile, data, sfinfo.frames) != sfinfo.frames) |
| 397 | { printf ("Line %d : bad read.\n", __LINE__) ; |
| 398 | exit (1) ; |
| 399 | } ; |
| 400 | |
| 401 | sf_close (sndfile) ; |
| 402 | |
| 403 | for (k = 0 ; k < (int) sfinfo.frames ; k++) |
| 404 | if (fabs (data [k]) > peak) |
| 405 | peak = fabs (data [k]) ; |
| 406 | |
| 407 | return peak ; |
| 408 | } /* measure_destination_peak */ |
| 409 | |
| 410 | static double |
| 411 | find_attenuation (double freq, const RESAMPLE_PROG *prog, int verbose) |
| 412 | { static char command [256] ; |
| 413 | double output_peak ; |
| 414 | int retval ; |
| 415 | char *filename ; |
| 416 | |
| 417 | filename = "destination.wav" ; |
| 418 | |
| 419 | generate_source_wav ("source.wav", &freq, 1, prog->format) ; |
| 420 | |
| 421 | remove (filename) ; |
| 422 | |
| 423 | snprintf (command, sizeof (command), prog->convert_cmd, 88189) ; |
| 424 | SAFE_STRNCAT (command, " >/dev/null 2>&1", sizeof (command)) ; |
| 425 | if ((retval = system (command)) != 0) |
| 426 | printf ("system returned %d\n", retval) ; |
| 427 | |
| 428 | output_peak = measure_destination_peak (filename) ; |
| 429 | |
| 430 | if (verbose) |
| 431 | printf (" freq : %f peak : %f\n", freq, output_peak) ; |
| 432 | |
| 433 | return fabs (20.0 * log10 (output_peak)) ; |
| 434 | } /* find_attenuation */ |
| 435 | |
| 436 | static double |
| 437 | bandwidth_test (const RESAMPLE_PROG *prog, int verbose) |
| 438 | { double f1, f2, a1, a2 ; |
| 439 | double freq, atten ; |
| 440 | |
| 441 | f1 = 0.35 ; |
| 442 | a1 = find_attenuation (f1, prog, verbose) ; |
| 443 | |
| 444 | f2 = 0.49999 ; |
| 445 | a2 = find_attenuation (f2, prog, verbose) ; |
| 446 | |
| 447 | |
| 448 | if (fabs (a1) < 1e-2 && a2 < 3.0) |
| 449 | return -1.0 ; |
| 450 | |
| 451 | if (a1 > 3.0 || a2 < 3.0) |
| 452 | { printf ("\n\nLine %d : cannot bracket 3dB point.\n\n", __LINE__) ; |
| 453 | exit (1) ; |
| 454 | } ; |
| 455 | |
| 456 | while (a2 - a1 > 1.0) |
| 457 | { freq = f1 + 0.5 * (f2 - f1) ; |
| 458 | atten = find_attenuation (freq, prog, verbose) ; |
| 459 | |
| 460 | if (atten < 3.0) |
| 461 | { f1 = freq ; |
| 462 | a1 = atten ; |
| 463 | } |
| 464 | else |
| 465 | { f2 = freq ; |
| 466 | a2 = atten ; |
| 467 | } ; |
| 468 | } ; |
| 469 | |
| 470 | freq = f1 + (3.0 - a1) * (f2 - f1) / (a2 - a1) ; |
| 471 | |
| 472 | return 200.0 * freq ; |
| 473 | } /* bandwidth_test */ |
| 474 | |
| 475 | static void |
| 476 | measure_program (const RESAMPLE_PROG *prog, int verbose) |
| 477 | { double snr, bandwidth, conversion_rate ; |
| 478 | int output_samples ; |
| 479 | struct tms time_data ; |
| 480 | time_t time_now ; |
| 481 | |
| 482 | printf ("\n Machine : %s\n", get_machine_details ()) ; |
| 483 | time_now = time (NULL) ; |
| 484 | printf (" Date : %s", ctime (&time_now)) ; |
| 485 | |
| 486 | get_version_string (prog) ; |
| 487 | printf (" Program : %s\n", version_string) ; |
| 488 | printf (" Command : %s\n\n", prog->convert_cmd) ; |
| 489 | |
| 490 | snr = measure_snr (prog, &output_samples, verbose) ; |
| 491 | |
| 492 | printf (" Worst case SNR : %6.2f dB\n", snr) ; |
| 493 | |
| 494 | times (&time_data) ; |
| 495 | |
| 496 | conversion_rate = (1.0 * output_samples * sysconf (_SC_CLK_TCK)) / time_data.tms_cutime ; |
| 497 | |
| 498 | printf (" Conversion rate : %5.0f samples/sec\n", conversion_rate) ; |
| 499 | |
| 500 | bandwidth = bandwidth_test (prog, verbose) ; |
| 501 | |
| 502 | if (bandwidth > 0.0) |
| 503 | printf (" Measured bandwidth : %5.2f %%\n", bandwidth) ; |
| 504 | else |
| 505 | printf (" Could not measure bandwidth (no -3dB point found).\n") ; |
| 506 | |
| 507 | return ; |
| 508 | } /* measure_program */ |
| 509 | |
| 510 | /*############################################################################## |
| 511 | */ |
| 512 | |
| 513 | #else |
| 514 | |
| 515 | int |
| 516 | main (void) |
| 517 | { puts ("\n" |
| 518 | "****************************************************************\n" |
| 519 | " This program has been compiled without :\n" |
| 520 | " 1) FFTW (http://www.fftw.org/).\n" |
| 521 | " 2) libsndfile (http://www.zip.com.au/~erikd/libsndfile/).\n" |
| 522 | " Without these two libraries there is not much it can do.\n" |
| 523 | "****************************************************************\n") ; |
| 524 | |
| 525 | return 0 ; |
| 526 | } /* main */ |
| 527 | |
| 528 | #endif /* (HAVE_FFTW3 && HAVE_SNDFILE) */ |
| 529 | |