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 "config.h" |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <math.h> |
| 25 | #include <time.h> |
| 26 | |
| 27 | #if (HAVE_FFTW3) |
| 28 | |
| 29 | #include <samplerate.h> |
| 30 | |
| 31 | #include "util.h" |
| 32 | |
| 33 | #define BUFFER_LEN 50000 |
| 34 | #define MAX_FREQS 4 |
| 35 | #define MAX_RATIOS 6 |
| 36 | #define MAX_SPEC_LEN (1<<15) |
| 37 | |
| 38 | #ifndef M_PI |
| 39 | #define M_PI 3.14159265358979323846264338 |
| 40 | #endif |
| 41 | |
| 42 | enum |
| 43 | { BOOLEAN_FALSE = 0, |
| 44 | BOOLEAN_TRUE = 1 |
| 45 | } ; |
| 46 | |
| 47 | typedef struct |
| 48 | { int freq_count ; |
| 49 | double freqs [MAX_FREQS] ; |
| 50 | |
| 51 | double src_ratio ; |
| 52 | int pass_band_peaks ; |
| 53 | |
| 54 | double snr ; |
| 55 | double peak_value ; |
| 56 | } SINGLE_TEST ; |
| 57 | |
| 58 | typedef struct |
| 59 | { int converter ; |
| 60 | int tests ; |
| 61 | int do_bandwidth_test ; |
| 62 | SINGLE_TEST test_data [10] ; |
| 63 | } CONVERTER_TEST ; |
| 64 | |
| 65 | static double snr_test (SINGLE_TEST *snr_test_data, int number, int converter, int verbose) ; |
| 66 | static double find_peak (float *output, int output_len) ; |
| 67 | static double bandwidth_test (int converter, int verbose) ; |
| 68 | |
| 69 | int |
| 70 | main (int argc, char *argv []) |
| 71 | { CONVERTER_TEST snr_test_data [] = |
| 72 | { |
| 73 | { SRC_ZERO_ORDER_HOLD, |
| 74 | 8, |
| 75 | BOOLEAN_FALSE, |
| 76 | { { 1, { 0.01111111111 }, 3.0, 1, 28.0, 1.0 }, |
| 77 | { 1, { 0.01111111111 }, 0.6, 1, 36.0, 1.0 }, |
| 78 | { 1, { 0.01111111111 }, 0.3, 1, 36.0, 1.0 }, |
| 79 | { 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 }, |
| 80 | { 1, { 0.01111111111 }, 1.001, 1, 38.0, 1.0 }, |
| 81 | { 2, { 0.011111, 0.324 }, 1.9999, 2, 14.0, 1.0 }, |
| 82 | { 2, { 0.012345, 0.457 }, 0.456789, 1, 12.0, 1.0 }, |
| 83 | { 1, { 0.3511111111 }, 1.33, 1, 10.0, 1.0 } |
| 84 | } |
| 85 | }, |
| 86 | |
| 87 | { SRC_LINEAR, |
| 88 | 8, |
| 89 | BOOLEAN_FALSE, |
| 90 | { { 1, { 0.01111111111 }, 3.0, 1, 73.0, 1.0 }, |
| 91 | { 1, { 0.01111111111 }, 0.6, 1, 73.0, 1.0 }, |
| 92 | { 1, { 0.01111111111 }, 0.3, 1, 73.0, 1.0 }, |
| 93 | { 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 }, |
| 94 | { 1, { 0.01111111111 }, 1.001, 1, 77.0, 1.0 }, |
| 95 | { 2, { 0.011111, 0.324 }, 1.9999, 2, 16.0, 0.94 }, |
| 96 | { 2, { 0.012345, 0.457 }, 0.456789, 1, 26.0, 0.96 }, |
| 97 | { 1, { 0.3511111111 }, 1.33, 1, 22.0, 0.99 } |
| 98 | } |
| 99 | }, |
| 100 | |
| 101 | { SRC_SINC_FASTEST, |
| 102 | 9, |
| 103 | BOOLEAN_TRUE, |
| 104 | { { 1, { 0.01111111111 }, 3.0, 1, 100.0, 1.0 }, |
| 105 | { 1, { 0.01111111111 }, 0.6, 1, 99.0, 1.0 }, |
| 106 | { 1, { 0.01111111111 }, 0.3, 1, 100.0, 1.0 }, |
| 107 | { 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 }, |
| 108 | { 1, { 0.01111111111 }, 1.001, 1, 100.0, 1.0 }, |
| 109 | { 2, { 0.011111, 0.324 }, 1.9999, 2, 97.0, 1.0 }, |
| 110 | { 2, { 0.012345, 0.457 }, 0.456789, 1, 100.0, 0.5 }, |
| 111 | { 2, { 0.011111, 0.45 }, 0.6, 1, 97.0, 0.5 }, |
| 112 | { 1, { 0.3511111111 }, 1.33, 1, 97.0, 1.0 } |
| 113 | } |
| 114 | }, |
| 115 | |
| 116 | { SRC_SINC_MEDIUM_QUALITY, |
| 117 | 9, |
| 118 | BOOLEAN_TRUE, |
| 119 | { { 1, { 0.01111111111 }, 3.0, 1, 145.0, 1.0 }, |
| 120 | { 1, { 0.01111111111 }, 0.6, 1, 132.0, 1.0 }, |
| 121 | { 1, { 0.01111111111 }, 0.3, 1, 138.0, 1.0 }, |
| 122 | { 1, { 0.01111111111 }, 1.0, 1, 157.0, 1.0 }, |
| 123 | { 1, { 0.01111111111 }, 1.001, 1, 148.0, 1.0 }, |
| 124 | { 2, { 0.011111, 0.324 }, 1.9999, 2, 127.0, 1.0 }, |
| 125 | { 2, { 0.012345, 0.457 }, 0.456789, 1, 124.0, 0.5 }, |
| 126 | { 2, { 0.011111, 0.45 }, 0.6, 1, 126.0, 0.5 }, |
| 127 | { 1, { 0.43111111111 }, 1.33, 1, 121.0, 1.0 } |
| 128 | } |
| 129 | }, |
| 130 | |
| 131 | { SRC_SINC_BEST_QUALITY, |
| 132 | 9, |
| 133 | BOOLEAN_TRUE, |
| 134 | { { 1, { 0.01111111111 }, 3.0, 1, 149.0, 1.0 }, |
| 135 | { 1, { 0.01111111111 }, 0.6, 1, 147.0, 1.0 }, |
| 136 | { 1, { 0.01111111111 }, 0.3, 1, 148.0, 1.0 }, |
| 137 | { 1, { 0.01111111111 }, 1.0, 1, 155.0, 1.0 }, |
| 138 | { 1, { 0.01111111111 }, 1.001, 1, 148.0, 1.0 }, |
| 139 | { 2, { 0.011111, 0.324 }, 1.9999, 2, 147.0, 1.0 }, |
| 140 | { 2, { 0.012345, 0.457 }, 0.456789, 1, 148.0, 0.5 }, |
| 141 | { 2, { 0.011111, 0.45 }, 0.6, 1, 149.0, 0.5 }, |
| 142 | { 1, { 0.43111111111 }, 1.33, 1, 145.0, 1.0 } |
| 143 | } |
| 144 | }, |
| 145 | } ; /* snr_test_data */ |
| 146 | |
| 147 | double best_snr, snr, freq3dB ; |
| 148 | int j, k, converter, verbose = 0 ; |
| 149 | |
| 150 | if (argc == 2 && strcmp (argv [1], "--verbose") == 0) |
| 151 | verbose = 1 ; |
| 152 | |
| 153 | puts ("") ; |
| 154 | |
| 155 | for (j = 0 ; j < ARRAY_LEN (snr_test_data) ; j++) |
| 156 | { best_snr = 5000.0 ; |
| 157 | |
| 158 | converter = snr_test_data [j].converter ; |
| 159 | |
| 160 | printf (" Converter %d : %s\n", converter, src_get_name (converter)) ; |
| 161 | printf (" %s\n", src_get_description (converter)) ; |
| 162 | |
| 163 | for (k = 0 ; k < snr_test_data [j].tests ; k++) |
| 164 | { snr = snr_test (&(snr_test_data [j].test_data [k]), k, converter, verbose) ; |
| 165 | if (best_snr > snr) |
| 166 | best_snr = snr ; |
| 167 | } ; |
| 168 | |
| 169 | printf (" Worst case Signal-to-Noise Ratio : %.2f dB.\n", best_snr) ; |
| 170 | |
| 171 | if (snr_test_data [j].do_bandwidth_test == BOOLEAN_FALSE) |
| 172 | { puts (" Bandwith test not performed on this converter.\n") ; |
| 173 | continue ; |
| 174 | } |
| 175 | |
| 176 | freq3dB = bandwidth_test (converter, verbose) ; |
| 177 | |
| 178 | printf (" Measured -3dB rolloff point : %5.2f %%.\n\n", freq3dB) ; |
| 179 | } ; |
| 180 | |
| 181 | return 0 ; |
| 182 | } /* main */ |
| 183 | |
| 184 | /*============================================================================== |
| 185 | */ |
| 186 | |
| 187 | static double |
| 188 | snr_test (SINGLE_TEST *test_data, int number, int converter, int verbose) |
| 189 | { static float data [BUFFER_LEN + 1] ; |
| 190 | static float output [MAX_SPEC_LEN] ; |
| 191 | |
| 192 | SRC_STATE *src_state ; |
| 193 | SRC_DATA src_data ; |
| 194 | |
| 195 | double output_peak, snr ; |
| 196 | int k, output_len, input_len, error ; |
| 197 | |
| 198 | if (verbose != 0) |
| 199 | { printf ("\tSignal-to-Noise Ratio Test %d.\n" |
| 200 | "\t=====================================\n", number) ; |
| 201 | printf ("\tFrequencies : [ ") ; |
| 202 | for (k = 0 ; k < test_data->freq_count ; k++) |
| 203 | printf ("%6.4f ", test_data->freqs [k]) ; |
| 204 | |
| 205 | printf ("]\n\tSRC Ratio : %8.4f\n", test_data->src_ratio) ; |
| 206 | } |
| 207 | else |
| 208 | { printf ("\tSignal-to-Noise Ratio Test %d : ", number) ; |
| 209 | fflush (stdout) ; |
| 210 | } ; |
| 211 | |
| 212 | /* Set up the output array. */ |
| 213 | if (test_data->src_ratio >= 1.0) |
| 214 | { output_len = MAX_SPEC_LEN ; |
| 215 | input_len = (int) ceil (MAX_SPEC_LEN / test_data->src_ratio) ; |
| 216 | if (input_len > BUFFER_LEN) |
| 217 | input_len = BUFFER_LEN ; |
| 218 | } |
| 219 | else |
| 220 | { input_len = BUFFER_LEN ; |
| 221 | output_len = (int) ceil (BUFFER_LEN * test_data->src_ratio) ; |
| 222 | output_len &= ((-1) << 4) ; |
| 223 | if (output_len > MAX_SPEC_LEN) |
| 224 | output_len = MAX_SPEC_LEN ; |
| 225 | input_len = (int) ceil (output_len / test_data->src_ratio) ; |
| 226 | } ; |
| 227 | |
| 228 | memset (output, 0, sizeof (output)) ; |
| 229 | |
| 230 | /* Generate input data array. */ |
| 231 | gen_windowed_sines (test_data->freq_count, test_data->freqs, 1.0, data, input_len) ; |
| 232 | |
| 233 | /* Perform sample rate conversion. */ |
| 234 | if ((src_state = src_new (converter, 1, &error)) == NULL) |
| 235 | { printf ("\n\nLine %d : src_new() failed : %s.\n\n", __LINE__, src_strerror (error)) ; |
| 236 | exit (1) ; |
| 237 | } ; |
| 238 | |
| 239 | src_data.end_of_input = 1 ; /* Only one buffer worth of input. */ |
| 240 | |
| 241 | src_data.data_in = data ; |
| 242 | src_data.input_frames = input_len ; |
| 243 | |
| 244 | src_data.src_ratio = test_data->src_ratio ; |
| 245 | |
| 246 | src_data.data_out = output ; |
| 247 | src_data.output_frames = output_len ; |
| 248 | |
| 249 | if ((error = src_process (src_state, &src_data))) |
| 250 | { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; |
| 251 | exit (1) ; |
| 252 | } ; |
| 253 | |
| 254 | src_state = src_delete (src_state) ; |
| 255 | |
| 256 | if (verbose != 0) |
| 257 | printf ("\tOutput Len : %ld\n", src_data.output_frames_gen) ; |
| 258 | |
| 259 | if (abs (src_data.output_frames_gen - output_len) > 4) |
| 260 | { printf ("\n\nLine %d : output data length should be %d.\n\n", __LINE__, output_len) ; |
| 261 | exit (1) ; |
| 262 | } ; |
| 263 | |
| 264 | /* Check output peak. */ |
| 265 | output_peak = find_peak (output, src_data.output_frames_gen) ; |
| 266 | |
| 267 | if (verbose != 0) |
| 268 | printf ("\tOutput Peak : %6.4f\n", output_peak) ; |
| 269 | |
| 270 | if (fabs (output_peak - test_data->peak_value) > 0.01) |
| 271 | { printf ("\n\nLine %d : output peak (%6.4f) should be %6.4f\n\n", __LINE__, output_peak, test_data->peak_value) ; |
| 272 | save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, output_len) ; |
| 273 | exit (1) ; |
| 274 | } ; |
| 275 | |
| 276 | /* Calculate signal-to-noise ratio. */ |
| 277 | snr = calculate_snr (output, src_data.output_frames_gen, test_data->pass_band_peaks) ; |
| 278 | |
| 279 | if (snr < 0.0) |
| 280 | { /* An error occurred. */ |
| 281 | save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, src_data.output_frames_gen) ; |
| 282 | exit (1) ; |
| 283 | } ; |
| 284 | |
| 285 | if (verbose != 0) |
| 286 | printf ("\tSNR Ratio : %.2f dB\n", snr) ; |
| 287 | |
| 288 | if (snr < test_data->snr) |
| 289 | { printf ("\n\nLine %d : SNR (%5.2f) should be > %6.2f dB\n\n", __LINE__, snr, test_data->snr) ; |
| 290 | exit (1) ; |
| 291 | } ; |
| 292 | |
| 293 | if (verbose != 0) |
| 294 | puts ("\t-------------------------------------\n\tPass\n") ; |
| 295 | else |
| 296 | puts ("Pass") ; |
| 297 | |
| 298 | return snr ; |
| 299 | } /* snr_test */ |
| 300 | |
| 301 | static double |
| 302 | find_peak (float *data, int len) |
| 303 | { double peak = 0.0 ; |
| 304 | int k = 0 ; |
| 305 | |
| 306 | for (k = 0 ; k < len ; k++) |
| 307 | if (fabs (data [k]) > peak) |
| 308 | peak = fabs (data [k]) ; |
| 309 | |
| 310 | return peak ; |
| 311 | } /* find_peak */ |
| 312 | |
| 313 | |
| 314 | static double |
| 315 | find_attenuation (double freq, int converter, int verbose) |
| 316 | { static float input [BUFFER_LEN] ; |
| 317 | static float output [2 * BUFFER_LEN] ; |
| 318 | |
| 319 | SRC_DATA src_data ; |
| 320 | double output_peak ; |
| 321 | int error ; |
| 322 | |
| 323 | gen_windowed_sines (1, &freq, 1.0, input, BUFFER_LEN) ; |
| 324 | |
| 325 | src_data.end_of_input = 1 ; /* Only one buffer worth of input. */ |
| 326 | |
| 327 | src_data.data_in = input ; |
| 328 | src_data.input_frames = BUFFER_LEN ; |
| 329 | |
| 330 | src_data.src_ratio = 1.999 ; |
| 331 | |
| 332 | src_data.data_out = output ; |
| 333 | src_data.output_frames = ARRAY_LEN (output) ; |
| 334 | |
| 335 | if ((error = src_simple (&src_data, converter, 1))) |
| 336 | { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; |
| 337 | exit (1) ; |
| 338 | } ; |
| 339 | |
| 340 | output_peak = find_peak (output, ARRAY_LEN (output)) ; |
| 341 | |
| 342 | if (verbose) |
| 343 | printf ("\tFreq : %6f InPeak : %6f OutPeak : %6f Atten : %6.2f dB\n", |
| 344 | freq, 1.0, output_peak, 20.0 * log10 (1.0 / output_peak)) ; |
| 345 | |
| 346 | return 20.0 * log10 (1.0 / output_peak) ; |
| 347 | } /* find_attenuation */ |
| 348 | |
| 349 | static double |
| 350 | bandwidth_test (int converter, int verbose) |
| 351 | { double f1, f2, a1, a2 ; |
| 352 | double freq, atten ; |
| 353 | |
| 354 | f1 = 0.35 ; |
| 355 | a1 = find_attenuation (f1, converter, verbose) ; |
| 356 | |
| 357 | f2 = 0.495 ; |
| 358 | a2 = find_attenuation (f2, converter, verbose) ; |
| 359 | |
| 360 | if (a1 > 3.0 || a2 < 3.0) |
| 361 | { printf ("\n\nLine %d : cannot bracket 3dB point.\n\n", __LINE__) ; |
| 362 | exit (1) ; |
| 363 | } ; |
| 364 | |
| 365 | while (a2 - a1 > 1.0) |
| 366 | { freq = f1 + 0.5 * (f2 - f1) ; |
| 367 | atten = find_attenuation (freq, converter, verbose) ; |
| 368 | |
| 369 | if (atten < 3.0) |
| 370 | { f1 = freq ; |
| 371 | a1 = atten ; |
| 372 | } |
| 373 | else |
| 374 | { f2 = freq ; |
| 375 | a2 = atten ; |
| 376 | } ; |
| 377 | } ; |
| 378 | |
| 379 | freq = f1 + (3.0 - a1) * (f2 - f1) / (a2 - a1) ; |
| 380 | |
| 381 | return 200.0 * freq ; |
| 382 | } /* bandwidth_test */ |
| 383 | |
| 384 | #else /* (HAVE_FFTW3) == 0 */ |
| 385 | |
| 386 | /* Alternative main function when librfftw is not available. */ |
| 387 | |
| 388 | int |
| 389 | main (void) |
| 390 | { puts ("\n" |
| 391 | "****************************************************************\n" |
| 392 | " This test cannot be run without FFTW (http://www.fftw.org/).\n" |
| 393 | " Both the real and the complex versions of the library are\n" |
| 394 | " required.") ; |
| 395 | puts ("****************************************************************\n") ; |
| 396 | |
| 397 | return 0 ; |
| 398 | } /* main */ |
| 399 | |
| 400 | #endif |
| 401 | |