Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pjmedia/tonegen.h> |
| 21 | #include <pjmedia/errno.h> |
| 22 | #include <pjmedia/silencedet.h> |
| 23 | #include <pj/assert.h> |
| 24 | #include <pj/ctype.h> |
| 25 | #include <pj/lock.h> |
| 26 | #include <pj/log.h> |
| 27 | #include <pj/pool.h> |
| 28 | |
| 29 | /* amplitude */ |
| 30 | #define AMP PJMEDIA_TONEGEN_VOLUME |
| 31 | |
| 32 | #ifndef M_PI |
| 33 | # define M_PI ((DATA)3.141592653589793238462643383279) |
| 34 | #endif |
| 35 | |
| 36 | #if PJMEDIA_TONEGEN_ALG==PJMEDIA_TONEGEN_SINE |
| 37 | #include <math.h> |
| 38 | #define DATA double |
| 39 | |
| 40 | /* |
| 41 | * This is the good old tone generator using sin(). |
| 42 | * Speed = 1347 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4). |
| 43 | * approx. 10.91 MIPS |
| 44 | * |
| 45 | * 506,535 usec/100.29 MIPS on ARM926EJ-S. |
| 46 | */ |
| 47 | struct gen |
| 48 | { |
| 49 | DATA add; |
| 50 | DATA c; |
| 51 | DATA vol; |
| 52 | }; |
| 53 | |
| 54 | #define GEN_INIT(var,R,F,A) var.add = ((DATA)F)/R, var.c=0, var.vol=A |
| 55 | #define GEN_SAMP(val,var) val = (short)(sin(var.c * 2 * M_PI) * \ |
| 56 | var.vol); \ |
| 57 | var.c += var.add |
| 58 | |
| 59 | #elif PJMEDIA_TONEGEN_ALG==PJMEDIA_TONEGEN_FLOATING_POINT |
| 60 | #include <math.h> |
| 61 | #define DATA float |
| 62 | |
| 63 | /* |
| 64 | * Default floating-point based tone generation using sine wave |
| 65 | * generation from: |
| 66 | * http://www.musicdsp.org/showone.php?id=10. |
| 67 | * This produces good quality tone in relatively faster time than |
| 68 | * the normal sin() generator. |
| 69 | * Speed = 350 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4). |
| 70 | * approx. 2.84 MIPS |
| 71 | * |
| 72 | * 18,037 usec/3.57 MIPS on ARM926EJ-S. |
| 73 | */ |
| 74 | struct gen |
| 75 | { |
| 76 | DATA a, s0, s1; |
| 77 | }; |
| 78 | |
| 79 | #define GEN_INIT(var,R,F,A) var.a = (DATA) (2.0 * sin(M_PI * F / R)); \ |
| 80 | var.s0 = 0; \ |
| 81 | var.s1 = (DATA)(0 - (int)A) |
| 82 | #define GEN_SAMP(val,var) var.s0 = var.s0 - var.a * var.s1; \ |
| 83 | var.s1 = var.s1 + var.a * var.s0; \ |
| 84 | val = (short) var.s0 |
| 85 | |
| 86 | #elif PJMEDIA_TONEGEN_ALG==PJMEDIA_TONEGEN_FIXED_POINT_CORDIC |
| 87 | /* Cordic algorithm with 28 bit size, from: |
| 88 | * http://www.dcs.gla.ac.uk/~jhw/cordic/ |
| 89 | * Speed = 742 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4). |
| 90 | * (PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP=7) |
| 91 | * approx. 6.01 MIPS |
| 92 | * |
| 93 | * ARM926EJ-S results: |
| 94 | * loop=7: 8,943 usec/1.77 MIPS |
| 95 | * loop=8: 9,872 usec/1.95 MIPS |
| 96 | * loop=10: 11,662 usec/2.31 MIPS |
| 97 | * loop=12: 13,561 usec/2.69 MIPS |
| 98 | */ |
| 99 | #define CORDIC_1K 0x026DD3B6 |
| 100 | #define CORDIC_HALF_PI 0x06487ED5 |
| 101 | #define CORDIC_PI (CORDIC_HALF_PI * 2) |
| 102 | #define CORDIC_MUL_BITS 26 |
| 103 | #define CORDIC_MUL (1 << CORDIC_MUL_BITS) |
| 104 | #define CORDIC_NTAB 28 |
| 105 | #define CORDIC_LOOP PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP |
| 106 | |
| 107 | static int cordic_ctab [] = |
| 108 | { |
| 109 | 0x03243F6A, 0x01DAC670, 0x00FADBAF, 0x007F56EA, 0x003FEAB7, |
| 110 | 0x001FFD55, 0x000FFFAA, 0x0007FFF5, 0x0003FFFE, 0x0001FFFF, |
| 111 | 0x0000FFFF, 0x00007FFF, 0x00003FFF, 0x00001FFF, 0x00000FFF, |
| 112 | 0x000007FF, 0x000003FF, 0x000001FF, 0x000000FF, 0x0000007F, |
| 113 | 0x0000003F, 0x0000001F, 0x0000000F, 0x00000007, 0x00000003, |
| 114 | 0x00000001, 0x00000000, 0x00000000 |
| 115 | }; |
| 116 | |
| 117 | static pj_int32_t cordic(pj_int32_t theta, unsigned n) |
| 118 | { |
| 119 | unsigned k; |
| 120 | int d; |
| 121 | pj_int32_t tx; |
| 122 | pj_int32_t x = CORDIC_1K, y = 0, z = theta; |
| 123 | |
| 124 | for (k=0; k<n; ++k) { |
| 125 | #if 0 |
| 126 | d = (z>=0) ? 0 : -1; |
| 127 | #else |
| 128 | /* Only slightly (~2.5%) faster, but not portable? */ |
| 129 | d = z>>27; |
| 130 | #endif |
| 131 | tx = x - (((y>>k) ^ d) - d); |
| 132 | y = y + (((x>>k) ^ d) - d); |
| 133 | z = z - ((cordic_ctab[k] ^ d) - d); |
| 134 | x = tx; |
| 135 | } |
| 136 | return y; |
| 137 | } |
| 138 | |
| 139 | /* Note: theta must be uint32 here */ |
| 140 | static pj_int32_t cordic_sin(pj_uint32_t theta, unsigned n) |
| 141 | { |
| 142 | if (theta < CORDIC_HALF_PI) |
| 143 | return cordic(theta, n); |
| 144 | else if (theta < CORDIC_PI) |
| 145 | return cordic(CORDIC_HALF_PI-(theta-CORDIC_HALF_PI), n); |
| 146 | else if (theta < CORDIC_PI + CORDIC_HALF_PI) |
| 147 | return -cordic(theta - CORDIC_PI, n); |
| 148 | else if (theta < 2 * CORDIC_PI) |
| 149 | return -cordic(CORDIC_HALF_PI-(theta-3*CORDIC_HALF_PI), n); |
| 150 | else { |
| 151 | pj_assert(!"Invalid cordic_sin() value"); |
| 152 | return 0; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | struct gen |
| 157 | { |
| 158 | unsigned add; |
| 159 | pj_uint32_t c; |
| 160 | unsigned vol; |
| 161 | }; |
| 162 | |
| 163 | #define VOL(var,v) (((v) * var.vol) >> 15) |
| 164 | #define GEN_INIT(var,R,F,A) gen_init(&var, R, F, A) |
| 165 | #define GEN_SAMP(val,var) val = gen_samp(&var) |
| 166 | |
| 167 | static void gen_init(struct gen *var, unsigned R, unsigned F, unsigned A) |
| 168 | { |
| 169 | var->add = 2*CORDIC_PI/R * F; |
| 170 | var->c = 0; |
| 171 | var->vol = A; |
| 172 | } |
| 173 | |
| 174 | PJ_INLINE(short) gen_samp(struct gen *var) |
| 175 | { |
| 176 | pj_int32_t val; |
| 177 | val = cordic_sin(var->c, CORDIC_LOOP); |
| 178 | /*val = (val * 32767) / CORDIC_MUL; |
| 179 | *val = VOL((*var), val); |
| 180 | */ |
| 181 | val = ((val >> 10) * var->vol) >> 16; |
| 182 | var->c += var->add; |
| 183 | if (var->c > 2*CORDIC_PI) |
| 184 | var->c -= (2 * CORDIC_PI); |
| 185 | return (short) val; |
| 186 | } |
| 187 | |
| 188 | #elif PJMEDIA_TONEGEN_ALG==PJMEDIA_TONEGEN_FAST_FIXED_POINT |
| 189 | |
| 190 | /* |
| 191 | * Fallback algorithm when floating point is disabled. |
| 192 | * This is a very fast fixed point tone generation using sine wave |
| 193 | * approximation from |
| 194 | * http://www.audiomulch.com/~rossb/code/sinusoids/ |
| 195 | * Quality wise not so good, but it's blazing fast! |
| 196 | * Speed = 117 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4). |
| 197 | * approx. 0.95 MIPS |
| 198 | * |
| 199 | * 1,449 usec/0.29 MIPS on ARM926EJ-S. |
| 200 | */ |
| 201 | PJ_INLINE(int) approximate_sin3(unsigned x) |
| 202 | { |
| 203 | unsigned s=-(int)(x>>31); |
| 204 | x+=x; |
| 205 | x=x>>16; |
| 206 | x*=x^0xffff; // x=x*(2-x) |
| 207 | x+=x; // optional |
| 208 | return x^s; |
| 209 | } |
| 210 | struct gen |
| 211 | { |
| 212 | unsigned add; |
| 213 | unsigned c; |
| 214 | unsigned vol; |
| 215 | }; |
| 216 | |
| 217 | #define MAXI ((unsigned)0xFFFFFFFF) |
| 218 | #define SIN approximate_sin3 |
| 219 | #define VOL(var,v) (((v) * var.vol) >> 15) |
| 220 | #define GEN_INIT(var,R,F,A) var.add = MAXI/R * F, var.c=0, var.vol=A |
| 221 | #define GEN_SAMP(val,var) val = (short) VOL(var,SIN(var.c)>>16); \ |
| 222 | var.c += var.add |
| 223 | |
| 224 | #else |
| 225 | #error "PJMEDIA_TONEGEN_ALG is not set correctly" |
| 226 | #endif |
| 227 | |
| 228 | struct gen_state |
| 229 | { |
| 230 | struct gen tone1; |
| 231 | struct gen tone2; |
| 232 | pj_bool_t has_tone2; |
| 233 | }; |
| 234 | |
| 235 | |
| 236 | static void init_generate_single_tone(struct gen_state *state, |
| 237 | unsigned clock_rate, |
| 238 | unsigned freq, |
| 239 | unsigned vol) |
| 240 | { |
| 241 | GEN_INIT(state->tone1,clock_rate,freq,vol); |
| 242 | state->has_tone2 = PJ_FALSE; |
| 243 | } |
| 244 | |
| 245 | static void generate_single_tone(struct gen_state *state, |
| 246 | unsigned channel_count, |
| 247 | unsigned samples, |
| 248 | short buf[]) |
| 249 | { |
| 250 | short *end = buf + samples; |
| 251 | |
| 252 | if (channel_count==1) { |
| 253 | |
| 254 | while (buf < end) { |
| 255 | GEN_SAMP(*buf++, state->tone1); |
| 256 | } |
| 257 | |
| 258 | } else if (channel_count == 2) { |
| 259 | |
| 260 | while (buf < end) { |
| 261 | GEN_SAMP(*buf, state->tone1); |
| 262 | *(buf+1) = *buf; |
| 263 | buf += 2; |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | |
| 269 | static void init_generate_dual_tone(struct gen_state *state, |
| 270 | unsigned clock_rate, |
| 271 | unsigned freq1, |
| 272 | unsigned freq2, |
| 273 | unsigned vol) |
| 274 | { |
| 275 | GEN_INIT(state->tone1,clock_rate,freq1,vol); |
| 276 | GEN_INIT(state->tone2,clock_rate,freq2,vol); |
| 277 | state->has_tone2 = PJ_TRUE; |
| 278 | } |
| 279 | |
| 280 | |
| 281 | static void generate_dual_tone(struct gen_state *state, |
| 282 | unsigned channel_count, |
| 283 | unsigned samples, |
| 284 | short buf[]) |
| 285 | { |
| 286 | short *end = buf + samples; |
| 287 | |
| 288 | if (channel_count==1) { |
| 289 | int val, val2; |
| 290 | while (buf < end) { |
| 291 | GEN_SAMP(val, state->tone1); |
| 292 | GEN_SAMP(val2, state->tone2); |
| 293 | *buf++ = (short)((val+val2) >> 1); |
| 294 | } |
| 295 | } else if (channel_count == 2) { |
| 296 | int val, val2; |
| 297 | while (buf < end) { |
| 298 | |
| 299 | GEN_SAMP(val, state->tone1); |
| 300 | GEN_SAMP(val2, state->tone2); |
| 301 | val = (val + val2) >> 1; |
| 302 | |
| 303 | *buf++ = (short)val; |
| 304 | *buf++ = (short)val; |
| 305 | } |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | |
| 310 | static void init_generate_tone(struct gen_state *state, |
| 311 | unsigned clock_rate, |
| 312 | unsigned freq1, |
| 313 | unsigned freq2, |
| 314 | unsigned vol) |
| 315 | { |
| 316 | if (freq2) |
| 317 | init_generate_dual_tone(state, clock_rate, freq1, freq2 ,vol); |
| 318 | else |
| 319 | init_generate_single_tone(state, clock_rate, freq1,vol); |
| 320 | } |
| 321 | |
| 322 | |
| 323 | static void generate_tone(struct gen_state *state, |
| 324 | unsigned channel_count, |
| 325 | unsigned samples, |
| 326 | short buf[]) |
| 327 | { |
| 328 | if (!state->has_tone2) |
| 329 | generate_single_tone(state, channel_count, samples, buf); |
| 330 | else |
| 331 | generate_dual_tone(state, channel_count, samples, buf); |
| 332 | } |
| 333 | |
| 334 | |
| 335 | /****************************************************************************/ |
| 336 | |
| 337 | #define SIGNATURE PJMEDIA_SIG_PORT_TONEGEN |
| 338 | #define THIS_FILE "tonegen.c" |
| 339 | |
| 340 | #if 0 |
| 341 | # define TRACE_(expr) PJ_LOG(4,expr) |
| 342 | #else |
| 343 | # define TRACE_(expr) |
| 344 | #endif |
| 345 | |
| 346 | enum flags |
| 347 | { |
| 348 | PJMEDIA_TONE_INITIALIZED = 1, |
| 349 | PJMEDIA_TONE_ENABLE_FADE = 2 |
| 350 | }; |
| 351 | |
| 352 | struct tonegen |
| 353 | { |
| 354 | pjmedia_port base; |
| 355 | |
| 356 | /* options */ |
| 357 | unsigned options; |
| 358 | unsigned playback_options; |
| 359 | unsigned fade_in_len; /* fade in for this # of samples */ |
| 360 | unsigned fade_out_len; /* fade out for this # of samples*/ |
| 361 | |
| 362 | /* lock */ |
| 363 | pj_lock_t *lock; |
| 364 | |
| 365 | /* Digit map */ |
| 366 | pjmedia_tone_digit_map *digit_map; |
| 367 | |
| 368 | /* Tone generation state */ |
| 369 | struct gen_state state; |
| 370 | |
| 371 | /* Currently played digits: */ |
| 372 | unsigned count; /* # of digits */ |
| 373 | unsigned cur_digit; /* currently played */ |
| 374 | unsigned dig_samples; /* sample pos in cur digit */ |
| 375 | pjmedia_tone_desc digits[PJMEDIA_TONEGEN_MAX_DIGITS];/* array of digits*/ |
| 376 | }; |
| 377 | |
| 378 | |
| 379 | /* Default digit map is DTMF */ |
| 380 | static pjmedia_tone_digit_map digit_map = |
| 381 | { |
| 382 | 16, |
| 383 | { |
| 384 | { '0', 941, 1336 }, |
| 385 | { '1', 697, 1209 }, |
| 386 | { '2', 697, 1336 }, |
| 387 | { '3', 697, 1477 }, |
| 388 | { '4', 770, 1209 }, |
| 389 | { '5', 770, 1336 }, |
| 390 | { '6', 770, 1477 }, |
| 391 | { '7', 852, 1209 }, |
| 392 | { '8', 852, 1336 }, |
| 393 | { '9', 852, 1477 }, |
| 394 | { 'a', 697, 1633 }, |
| 395 | { 'b', 770, 1633 }, |
| 396 | { 'c', 852, 1633 }, |
| 397 | { 'd', 941, 1633 }, |
| 398 | { '*', 941, 1209 }, |
| 399 | { '#', 941, 1477 }, |
| 400 | } |
| 401 | }; |
| 402 | |
| 403 | |
| 404 | static pj_status_t tonegen_get_frame(pjmedia_port *this_port, |
| 405 | pjmedia_frame *frame); |
| 406 | static pj_status_t tonegen_destroy(pjmedia_port *this_port); |
| 407 | |
| 408 | /* |
| 409 | * Create an instance of tone generator with the specified parameters. |
| 410 | * When the tone generator is first created, it will be loaded with the |
| 411 | * default digit map. |
| 412 | */ |
| 413 | PJ_DEF(pj_status_t) pjmedia_tonegen_create2(pj_pool_t *pool, |
| 414 | const pj_str_t *name, |
| 415 | unsigned clock_rate, |
| 416 | unsigned channel_count, |
| 417 | unsigned samples_per_frame, |
| 418 | unsigned bits_per_sample, |
| 419 | unsigned options, |
| 420 | pjmedia_port **p_port) |
| 421 | { |
| 422 | const pj_str_t STR_TONE_GEN = pj_str("tonegen"); |
| 423 | struct tonegen *tonegen; |
| 424 | pj_status_t status; |
| 425 | |
| 426 | PJ_ASSERT_RETURN(pool && clock_rate && channel_count && |
| 427 | samples_per_frame && bits_per_sample == 16 && |
| 428 | p_port != NULL, PJ_EINVAL); |
| 429 | |
| 430 | /* Only support mono and stereo */ |
| 431 | PJ_ASSERT_RETURN(channel_count==1 || channel_count==2, PJ_EINVAL); |
| 432 | |
| 433 | /* Create and initialize port */ |
| 434 | tonegen = PJ_POOL_ZALLOC_T(pool, struct tonegen); |
| 435 | if (name == NULL || name->slen == 0) name = &STR_TONE_GEN; |
| 436 | status = pjmedia_port_info_init(&tonegen->base.info, name, |
| 437 | SIGNATURE, clock_rate, channel_count, |
| 438 | bits_per_sample, samples_per_frame); |
| 439 | if (status != PJ_SUCCESS) |
| 440 | return status; |
| 441 | |
| 442 | tonegen->options = options; |
| 443 | tonegen->base.get_frame = &tonegen_get_frame; |
| 444 | tonegen->base.on_destroy = &tonegen_destroy; |
| 445 | tonegen->digit_map = &digit_map; |
| 446 | |
| 447 | tonegen->fade_in_len = PJMEDIA_TONEGEN_FADE_IN_TIME * clock_rate / 1000; |
| 448 | tonegen->fade_out_len = PJMEDIA_TONEGEN_FADE_OUT_TIME * clock_rate / 1000; |
| 449 | |
| 450 | /* Lock */ |
| 451 | if (options & PJMEDIA_TONEGEN_NO_LOCK) { |
| 452 | status = pj_lock_create_null_mutex(pool, "tonegen", &tonegen->lock); |
| 453 | } else { |
| 454 | status = pj_lock_create_simple_mutex(pool, "tonegen", &tonegen->lock); |
| 455 | } |
| 456 | |
| 457 | if (status != PJ_SUCCESS) { |
| 458 | return status; |
| 459 | } |
| 460 | |
| 461 | TRACE_((THIS_FILE, "Tonegen created: %u/%u/%u/%u", clock_rate, |
| 462 | channel_count, samples_per_frame, bits_per_sample)); |
| 463 | |
| 464 | /* Done */ |
| 465 | *p_port = &tonegen->base; |
| 466 | return PJ_SUCCESS; |
| 467 | } |
| 468 | |
| 469 | |
| 470 | PJ_DEF(pj_status_t) pjmedia_tonegen_create( pj_pool_t *pool, |
| 471 | unsigned clock_rate, |
| 472 | unsigned channel_count, |
| 473 | unsigned samples_per_frame, |
| 474 | unsigned bits_per_sample, |
| 475 | unsigned options, |
| 476 | pjmedia_port **p_port) |
| 477 | { |
| 478 | return pjmedia_tonegen_create2(pool, NULL, clock_rate, channel_count, |
| 479 | samples_per_frame, bits_per_sample, |
| 480 | options, p_port); |
| 481 | } |
| 482 | |
| 483 | |
| 484 | /* |
| 485 | * Check if the tone generator is still busy producing some tones. |
| 486 | */ |
| 487 | PJ_DEF(pj_bool_t) pjmedia_tonegen_is_busy(pjmedia_port *port) |
| 488 | { |
| 489 | struct tonegen *tonegen = (struct tonegen*) port; |
| 490 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_TRUE); |
| 491 | return tonegen->count != 0; |
| 492 | } |
| 493 | |
| 494 | |
| 495 | /* |
| 496 | * Instruct the tone generator to stop current processing. |
| 497 | */ |
| 498 | PJ_DEF(pj_status_t) pjmedia_tonegen_stop(pjmedia_port *port) |
| 499 | { |
| 500 | struct tonegen *tonegen = (struct tonegen*) port; |
| 501 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVAL); |
| 502 | |
| 503 | TRACE_((THIS_FILE, "tonegen_stop()")); |
| 504 | |
| 505 | pj_lock_acquire(tonegen->lock); |
| 506 | tonegen->count = 0; |
| 507 | tonegen->cur_digit = 0; |
| 508 | tonegen->dig_samples = 0; |
| 509 | pj_lock_release(tonegen->lock); |
| 510 | |
| 511 | return PJ_SUCCESS; |
| 512 | } |
| 513 | |
| 514 | |
| 515 | /* |
| 516 | * Instruct the tone generator to stop current processing. |
| 517 | */ |
| 518 | PJ_DEF(pj_status_t) pjmedia_tonegen_rewind(pjmedia_port *port) |
| 519 | { |
| 520 | struct tonegen *tonegen = (struct tonegen*) port; |
| 521 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVAL); |
| 522 | |
| 523 | TRACE_((THIS_FILE, "tonegen_rewind()")); |
| 524 | |
| 525 | /* Reset back to the first tone */ |
| 526 | pj_lock_acquire(tonegen->lock); |
| 527 | tonegen->cur_digit = 0; |
| 528 | tonegen->dig_samples = 0; |
| 529 | pj_lock_release(tonegen->lock); |
| 530 | |
| 531 | return PJ_SUCCESS; |
| 532 | } |
| 533 | |
| 534 | |
| 535 | /* |
| 536 | * Callback to destroy tonegen |
| 537 | */ |
| 538 | static pj_status_t tonegen_destroy(pjmedia_port *port) |
| 539 | { |
| 540 | struct tonegen *tonegen = (struct tonegen*) port; |
| 541 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVAL); |
| 542 | |
| 543 | TRACE_((THIS_FILE, "tonegen_destroy()")); |
| 544 | |
| 545 | pj_lock_acquire(tonegen->lock); |
| 546 | pj_lock_release(tonegen->lock); |
| 547 | |
| 548 | pj_lock_destroy(tonegen->lock); |
| 549 | |
| 550 | return PJ_SUCCESS; |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Fill a frame with tones. |
| 555 | */ |
| 556 | static pj_status_t tonegen_get_frame(pjmedia_port *port, |
| 557 | pjmedia_frame *frame) |
| 558 | { |
| 559 | struct tonegen *tonegen = (struct tonegen*) port; |
| 560 | short *dst, *end; |
| 561 | unsigned clock_rate = PJMEDIA_PIA_SRATE(&tonegen->base.info); |
| 562 | |
| 563 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVAL); |
| 564 | |
| 565 | pj_lock_acquire(tonegen->lock); |
| 566 | |
| 567 | if (tonegen->count == 0) { |
| 568 | /* We don't have digits to play */ |
| 569 | frame->type = PJMEDIA_FRAME_TYPE_NONE; |
| 570 | goto on_return; |
| 571 | } |
| 572 | |
| 573 | if (tonegen->cur_digit > tonegen->count) { |
| 574 | /* We have played all the digits */ |
| 575 | if ((tonegen->options|tonegen->playback_options)&PJMEDIA_TONEGEN_LOOP) |
| 576 | { |
| 577 | /* Reset back to the first tone */ |
| 578 | tonegen->cur_digit = 0; |
| 579 | tonegen->dig_samples = 0; |
| 580 | |
| 581 | TRACE_((THIS_FILE, "tonegen_get_frame(): rewind")); |
| 582 | |
| 583 | } else { |
| 584 | tonegen->count = 0; |
| 585 | tonegen->cur_digit = 0; |
| 586 | frame->type = PJMEDIA_FRAME_TYPE_NONE; |
| 587 | TRACE_((THIS_FILE, "tonegen_get_frame(): no more digit")); |
| 588 | goto on_return; |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | if (tonegen->dig_samples>=(tonegen->digits[tonegen->cur_digit].on_msec+ |
| 593 | tonegen->digits[tonegen->cur_digit].off_msec)* |
| 594 | clock_rate / 1000) |
| 595 | { |
| 596 | /* We have finished with current digit */ |
| 597 | tonegen->cur_digit++; |
| 598 | tonegen->dig_samples = 0; |
| 599 | |
| 600 | TRACE_((THIS_FILE, "tonegen_get_frame(): next digit")); |
| 601 | } |
| 602 | |
| 603 | if (tonegen->cur_digit >= tonegen->count) { |
| 604 | /* After we're finished with the last digit, we have played all |
| 605 | * the digits |
| 606 | */ |
| 607 | if ((tonegen->options|tonegen->playback_options)&PJMEDIA_TONEGEN_LOOP) |
| 608 | { |
| 609 | /* Reset back to the first tone */ |
| 610 | tonegen->cur_digit = 0; |
| 611 | tonegen->dig_samples = 0; |
| 612 | |
| 613 | TRACE_((THIS_FILE, "tonegen_get_frame(): rewind")); |
| 614 | |
| 615 | } else { |
| 616 | tonegen->count = 0; |
| 617 | tonegen->cur_digit = 0; |
| 618 | frame->type = PJMEDIA_FRAME_TYPE_NONE; |
| 619 | TRACE_((THIS_FILE, "tonegen_get_frame(): no more digit")); |
| 620 | goto on_return; |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | dst = (short*) frame->buf; |
| 625 | end = dst + PJMEDIA_PIA_SPF(&port->info); |
| 626 | |
| 627 | while (dst < end) { |
| 628 | pjmedia_tone_desc *dig = &tonegen->digits[tonegen->cur_digit]; |
| 629 | unsigned required, cnt, on_samp, off_samp; |
| 630 | |
| 631 | required = (unsigned)(end - dst); |
| 632 | on_samp = dig->on_msec * clock_rate / 1000; |
| 633 | off_samp = dig->off_msec * clock_rate / 1000; |
| 634 | |
| 635 | /* Init tonegen */ |
| 636 | if (tonegen->dig_samples == 0 && |
| 637 | (tonegen->count!=1 || !(dig->flags & PJMEDIA_TONE_INITIALIZED))) |
| 638 | { |
| 639 | init_generate_tone(&tonegen->state, |
| 640 | PJMEDIA_PIA_SRATE(&port->info), |
| 641 | dig->freq1, dig->freq2, dig->volume); |
| 642 | dig->flags |= PJMEDIA_TONE_INITIALIZED; |
| 643 | if (tonegen->cur_digit > 0) { |
| 644 | /* Clear initialized flag of previous digit */ |
| 645 | tonegen->digits[tonegen->cur_digit-1].flags &= |
| 646 | (~PJMEDIA_TONE_INITIALIZED); |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | /* Add tone signal */ |
| 651 | if (tonegen->dig_samples < on_samp) { |
| 652 | cnt = on_samp - tonegen->dig_samples; |
| 653 | if (cnt > required) |
| 654 | cnt = required; |
| 655 | generate_tone(&tonegen->state, |
| 656 | PJMEDIA_PIA_CCNT(&port->info), |
| 657 | cnt, dst); |
| 658 | |
| 659 | dst += cnt; |
| 660 | tonegen->dig_samples += cnt; |
| 661 | required -= cnt; |
| 662 | |
| 663 | if ((dig->flags & PJMEDIA_TONE_ENABLE_FADE) && |
| 664 | tonegen->dig_samples == cnt) |
| 665 | { |
| 666 | /* Fade in */ |
| 667 | short *samp = (dst - cnt); |
| 668 | short *end; |
| 669 | |
| 670 | if (cnt > tonegen->fade_in_len) |
| 671 | cnt = tonegen->fade_in_len; |
| 672 | end = samp + cnt; |
| 673 | if (cnt) { |
| 674 | const unsigned step = 0xFFFF / cnt; |
| 675 | unsigned scale = 0; |
| 676 | |
| 677 | for (; samp < end; ++samp) { |
| 678 | (*samp) = (short)(((*samp) * scale) >> 16); |
| 679 | scale += step; |
| 680 | } |
| 681 | } |
| 682 | } else if ((dig->flags & PJMEDIA_TONE_ENABLE_FADE) && |
| 683 | tonegen->dig_samples==on_samp) |
| 684 | { |
| 685 | /* Fade out */ |
| 686 | if (cnt > tonegen->fade_out_len) |
| 687 | cnt = tonegen->fade_out_len; |
| 688 | if (cnt) { |
| 689 | short *samp = (dst - cnt); |
| 690 | const unsigned step = 0xFFFF / cnt; |
| 691 | unsigned scale = 0xFFFF - step; |
| 692 | |
| 693 | for (; samp < dst; ++samp) { |
| 694 | (*samp) = (short)(((*samp) * scale) >> 16); |
| 695 | scale -= step; |
| 696 | } |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | if (dst == end) |
| 701 | break; |
| 702 | } |
| 703 | |
| 704 | /* Add silence signal */ |
| 705 | cnt = off_samp + on_samp - tonegen->dig_samples; |
| 706 | if (cnt > required) |
| 707 | cnt = required; |
| 708 | pjmedia_zero_samples(dst, cnt); |
| 709 | dst += cnt; |
| 710 | tonegen->dig_samples += cnt; |
| 711 | |
| 712 | /* Move to next digit if we're finished with this tone */ |
| 713 | if (tonegen->dig_samples >= on_samp + off_samp) { |
| 714 | tonegen->cur_digit++; |
| 715 | tonegen->dig_samples = 0; |
| 716 | |
| 717 | if (tonegen->cur_digit >= tonegen->count) { |
| 718 | /* All digits have been played */ |
| 719 | if ((tonegen->options & PJMEDIA_TONEGEN_LOOP) || |
| 720 | (tonegen->playback_options & PJMEDIA_TONEGEN_LOOP)) |
| 721 | { |
| 722 | tonegen->cur_digit = 0; |
| 723 | } else { |
| 724 | break; |
| 725 | } |
| 726 | } |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | if (dst < end) |
| 731 | pjmedia_zero_samples(dst, (unsigned)(end-dst)); |
| 732 | |
| 733 | frame->type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 734 | frame->size = PJMEDIA_PIA_AVG_FSZ(&port->info); |
| 735 | |
| 736 | TRACE_((THIS_FILE, "tonegen_get_frame(): frame created, level=%u", |
| 737 | pjmedia_calc_avg_signal((pj_int16_t*)frame->buf, frame->size/2))); |
| 738 | |
| 739 | if (tonegen->cur_digit >= tonegen->count) { |
| 740 | if ((tonegen->options|tonegen->playback_options)&PJMEDIA_TONEGEN_LOOP) |
| 741 | { |
| 742 | /* Reset back to the first tone */ |
| 743 | tonegen->cur_digit = 0; |
| 744 | tonegen->dig_samples = 0; |
| 745 | |
| 746 | TRACE_((THIS_FILE, "tonegen_get_frame(): rewind")); |
| 747 | |
| 748 | } else { |
| 749 | tonegen->count = 0; |
| 750 | tonegen->cur_digit = 0; |
| 751 | |
| 752 | TRACE_((THIS_FILE, "tonegen_get_frame(): no more digit")); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | on_return: |
| 757 | pj_lock_release(tonegen->lock); |
| 758 | return PJ_SUCCESS; |
| 759 | } |
| 760 | |
| 761 | |
| 762 | /* |
| 763 | * Play tones. |
| 764 | */ |
| 765 | PJ_DEF(pj_status_t) pjmedia_tonegen_play( pjmedia_port *port, |
| 766 | unsigned count, |
| 767 | const pjmedia_tone_desc tones[], |
| 768 | unsigned options) |
| 769 | { |
| 770 | struct tonegen *tonegen = (struct tonegen*) port; |
| 771 | unsigned i; |
| 772 | |
| 773 | PJ_ASSERT_RETURN(port && port->info.signature == SIGNATURE && |
| 774 | count && tones, PJ_EINVAL); |
| 775 | |
| 776 | /* Don't put more than available buffer */ |
| 777 | PJ_ASSERT_RETURN(count+tonegen->count <= PJMEDIA_TONEGEN_MAX_DIGITS, |
| 778 | PJ_ETOOMANY); |
| 779 | |
| 780 | pj_lock_acquire(tonegen->lock); |
| 781 | |
| 782 | /* Set playback options */ |
| 783 | tonegen->playback_options = options; |
| 784 | |
| 785 | /* Copy digits */ |
| 786 | pj_memcpy(tonegen->digits + tonegen->count, |
| 787 | tones, count * sizeof(pjmedia_tone_desc)); |
| 788 | |
| 789 | /* Normalize volume, and check if we need to disable fading. |
| 790 | * Disable fading if tone off time is zero. Application probably |
| 791 | * wants to play this tone continuously (e.g. dial tone). |
| 792 | */ |
| 793 | for (i=0; i<count; ++i) { |
| 794 | pjmedia_tone_desc *t = &tonegen->digits[i+tonegen->count]; |
| 795 | if (t->volume == 0) |
| 796 | t->volume = AMP; |
| 797 | else if (t->volume < 0) |
| 798 | t->volume = (short) -t->volume; |
| 799 | /* Reset flags */ |
| 800 | t->flags = 0; |
| 801 | if (t->off_msec != 0) |
| 802 | t->flags |= PJMEDIA_TONE_ENABLE_FADE; |
| 803 | } |
| 804 | |
| 805 | tonegen->count += count; |
| 806 | |
| 807 | pj_lock_release(tonegen->lock); |
| 808 | |
| 809 | return PJ_SUCCESS; |
| 810 | } |
| 811 | |
| 812 | |
| 813 | /* |
| 814 | * Play digits. |
| 815 | */ |
| 816 | PJ_DEF(pj_status_t) pjmedia_tonegen_play_digits( pjmedia_port *port, |
| 817 | unsigned count, |
| 818 | const pjmedia_tone_digit digits[], |
| 819 | unsigned options) |
| 820 | { |
| 821 | struct tonegen *tonegen = (struct tonegen*) port; |
| 822 | pjmedia_tone_desc tones[PJMEDIA_TONEGEN_MAX_DIGITS]; |
| 823 | const pjmedia_tone_digit_map *map; |
| 824 | unsigned i; |
| 825 | |
| 826 | PJ_ASSERT_RETURN(port && port->info.signature == SIGNATURE && |
| 827 | count && digits, PJ_EINVAL); |
| 828 | PJ_ASSERT_RETURN(count < PJMEDIA_TONEGEN_MAX_DIGITS, PJ_ETOOMANY); |
| 829 | |
| 830 | pj_lock_acquire(tonegen->lock); |
| 831 | |
| 832 | map = tonegen->digit_map; |
| 833 | |
| 834 | for (i=0; i<count; ++i) { |
| 835 | int d = pj_tolower(digits[i].digit); |
| 836 | unsigned j; |
| 837 | |
| 838 | /* Translate ASCII digits with digitmap */ |
| 839 | for (j=0; j<map->count; ++j) { |
| 840 | if (d == map->digits[j].digit) |
| 841 | break; |
| 842 | } |
| 843 | if (j == map->count) { |
| 844 | pj_lock_release(tonegen->lock); |
| 845 | return PJMEDIA_RTP_EINDTMF; |
| 846 | } |
| 847 | |
| 848 | tones[i].freq1 = map->digits[j].freq1; |
| 849 | tones[i].freq2 = map->digits[j].freq2; |
| 850 | tones[i].on_msec = digits[i].on_msec; |
| 851 | tones[i].off_msec = digits[i].off_msec; |
| 852 | tones[i].volume = digits[i].volume; |
| 853 | } |
| 854 | |
| 855 | pj_lock_release(tonegen->lock); |
| 856 | |
| 857 | return pjmedia_tonegen_play(port, count, tones, options); |
| 858 | } |
| 859 | |
| 860 | |
| 861 | /* |
| 862 | * Get the digit-map currently used by this tone generator. |
| 863 | */ |
| 864 | PJ_DEF(pj_status_t) pjmedia_tonegen_get_digit_map(pjmedia_port *port, |
| 865 | const pjmedia_tone_digit_map **m) |
| 866 | { |
| 867 | struct tonegen *tonegen = (struct tonegen*) port; |
| 868 | |
| 869 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVAL); |
| 870 | PJ_ASSERT_RETURN(m != NULL, PJ_EINVAL); |
| 871 | |
| 872 | *m = tonegen->digit_map; |
| 873 | |
| 874 | return PJ_SUCCESS; |
| 875 | } |
| 876 | |
| 877 | |
| 878 | /* |
| 879 | * Set digit map to be used by the tone generator. |
| 880 | */ |
| 881 | PJ_DEF(pj_status_t) pjmedia_tonegen_set_digit_map(pjmedia_port *port, |
| 882 | pjmedia_tone_digit_map *m) |
| 883 | { |
| 884 | struct tonegen *tonegen = (struct tonegen*) port; |
| 885 | |
| 886 | PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVAL); |
| 887 | PJ_ASSERT_RETURN(m != NULL, PJ_EINVAL); |
| 888 | |
| 889 | pj_lock_acquire(tonegen->lock); |
| 890 | |
| 891 | tonegen->digit_map = m; |
| 892 | |
| 893 | pj_lock_release(tonegen->lock); |
| 894 | |
| 895 | return PJ_SUCCESS; |
| 896 | } |
| 897 | |
| 898 | |