Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id: gsm.c 4537 2013-06-19 06:47:43Z riza $ */ |
| 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-codec/gsm.h> |
| 21 | #include <pjmedia/codec.h> |
| 22 | #include <pjmedia/errno.h> |
| 23 | #include <pjmedia/endpoint.h> |
| 24 | #include <pjmedia/plc.h> |
| 25 | #include <pjmedia/port.h> |
| 26 | #include <pjmedia/silencedet.h> |
| 27 | #include <pj/assert.h> |
| 28 | #include <pj/pool.h> |
| 29 | #include <pj/string.h> |
| 30 | #include <pj/os.h> |
| 31 | |
| 32 | /* |
| 33 | * Only build this file if PJMEDIA_HAS_GSM_CODEC != 0 |
| 34 | */ |
| 35 | #if defined(PJMEDIA_HAS_GSM_CODEC) && PJMEDIA_HAS_GSM_CODEC != 0 |
| 36 | |
| 37 | #if defined(PJMEDIA_EXTERNAL_GSM_CODEC) && PJMEDIA_EXTERNAL_GSM_CODEC |
| 38 | # if PJMEDIA_EXTERNAL_GSM_GSM_H |
| 39 | # include <gsm/gsm.h> |
| 40 | # elif PJMEDIA_EXTERNAL_GSM_H |
| 41 | # include <gsm.h> |
| 42 | # else |
| 43 | # error Please set the location of gsm.h |
| 44 | # endif |
| 45 | #else |
| 46 | # include "../../third_party/gsm/inc/gsm.h" |
| 47 | #endif |
| 48 | |
| 49 | /* We removed PLC in 0.6 (and re-enabled it again in 0.9!) */ |
| 50 | #define PLC_DISABLED 0 |
| 51 | |
| 52 | |
| 53 | /* Prototypes for GSM factory */ |
| 54 | static pj_status_t gsm_test_alloc( pjmedia_codec_factory *factory, |
| 55 | const pjmedia_codec_info *id ); |
| 56 | static pj_status_t gsm_default_attr( pjmedia_codec_factory *factory, |
| 57 | const pjmedia_codec_info *id, |
| 58 | pjmedia_codec_param *attr ); |
| 59 | static pj_status_t gsm_enum_codecs( pjmedia_codec_factory *factory, |
| 60 | unsigned *count, |
| 61 | pjmedia_codec_info codecs[]); |
| 62 | static pj_status_t gsm_alloc_codec( pjmedia_codec_factory *factory, |
| 63 | const pjmedia_codec_info *id, |
| 64 | pjmedia_codec **p_codec); |
| 65 | static pj_status_t gsm_dealloc_codec( pjmedia_codec_factory *factory, |
| 66 | pjmedia_codec *codec ); |
| 67 | |
| 68 | /* Prototypes for GSM implementation. */ |
| 69 | static pj_status_t gsm_codec_init( pjmedia_codec *codec, |
| 70 | pj_pool_t *pool ); |
| 71 | static pj_status_t gsm_codec_open( pjmedia_codec *codec, |
| 72 | pjmedia_codec_param *attr ); |
| 73 | static pj_status_t gsm_codec_close( pjmedia_codec *codec ); |
| 74 | static pj_status_t gsm_codec_modify(pjmedia_codec *codec, |
| 75 | const pjmedia_codec_param *attr ); |
| 76 | static pj_status_t gsm_codec_parse( pjmedia_codec *codec, |
| 77 | void *pkt, |
| 78 | pj_size_t pkt_size, |
| 79 | const pj_timestamp *ts, |
| 80 | unsigned *frame_cnt, |
| 81 | pjmedia_frame frames[]); |
| 82 | static pj_status_t gsm_codec_encode( pjmedia_codec *codec, |
| 83 | const struct pjmedia_frame *input, |
| 84 | unsigned output_buf_len, |
| 85 | struct pjmedia_frame *output); |
| 86 | static pj_status_t gsm_codec_decode( pjmedia_codec *codec, |
| 87 | const struct pjmedia_frame *input, |
| 88 | unsigned output_buf_len, |
| 89 | struct pjmedia_frame *output); |
| 90 | #if !PLC_DISABLED |
| 91 | static pj_status_t gsm_codec_recover(pjmedia_codec *codec, |
| 92 | unsigned output_buf_len, |
| 93 | struct pjmedia_frame *output); |
| 94 | #endif |
| 95 | |
| 96 | /* Definition for GSM codec operations. */ |
| 97 | static pjmedia_codec_op gsm_op = |
| 98 | { |
| 99 | &gsm_codec_init, |
| 100 | &gsm_codec_open, |
| 101 | &gsm_codec_close, |
| 102 | &gsm_codec_modify, |
| 103 | &gsm_codec_parse, |
| 104 | &gsm_codec_encode, |
| 105 | &gsm_codec_decode, |
| 106 | #if !PLC_DISABLED |
| 107 | &gsm_codec_recover |
| 108 | #else |
| 109 | NULL |
| 110 | #endif |
| 111 | }; |
| 112 | |
| 113 | /* Definition for GSM codec factory operations. */ |
| 114 | static pjmedia_codec_factory_op gsm_factory_op = |
| 115 | { |
| 116 | &gsm_test_alloc, |
| 117 | &gsm_default_attr, |
| 118 | &gsm_enum_codecs, |
| 119 | &gsm_alloc_codec, |
| 120 | &gsm_dealloc_codec, |
| 121 | &pjmedia_codec_gsm_deinit |
| 122 | }; |
| 123 | |
| 124 | /* GSM factory */ |
| 125 | static struct gsm_codec_factory |
| 126 | { |
| 127 | pjmedia_codec_factory base; |
| 128 | pjmedia_endpt *endpt; |
| 129 | pj_pool_t *pool; |
| 130 | pj_mutex_t *mutex; |
| 131 | pjmedia_codec codec_list; |
| 132 | } gsm_codec_factory; |
| 133 | |
| 134 | |
| 135 | /* GSM codec private data. */ |
| 136 | struct gsm_data |
| 137 | { |
| 138 | struct gsm_state *encoder; |
| 139 | struct gsm_state *decoder; |
| 140 | pj_bool_t plc_enabled; |
| 141 | #if !PLC_DISABLED |
| 142 | pjmedia_plc *plc; |
| 143 | #endif |
| 144 | pj_bool_t vad_enabled; |
| 145 | pjmedia_silence_det *vad; |
| 146 | pj_timestamp last_tx; |
| 147 | }; |
| 148 | |
| 149 | |
| 150 | |
| 151 | /* |
| 152 | * Initialize and register GSM codec factory to pjmedia endpoint. |
| 153 | */ |
| 154 | PJ_DEF(pj_status_t) pjmedia_codec_gsm_init( pjmedia_endpt *endpt ) |
| 155 | { |
| 156 | pjmedia_codec_mgr *codec_mgr; |
| 157 | pj_status_t status; |
| 158 | |
| 159 | if (gsm_codec_factory.pool != NULL) |
| 160 | return PJ_SUCCESS; |
| 161 | |
| 162 | /* Create GSM codec factory. */ |
| 163 | gsm_codec_factory.base.op = &gsm_factory_op; |
| 164 | gsm_codec_factory.base.factory_data = NULL; |
| 165 | gsm_codec_factory.endpt = endpt; |
| 166 | |
| 167 | gsm_codec_factory.pool = pjmedia_endpt_create_pool(endpt, "gsm", 4000, |
| 168 | 4000); |
| 169 | if (!gsm_codec_factory.pool) |
| 170 | return PJ_ENOMEM; |
| 171 | |
| 172 | pj_list_init(&gsm_codec_factory.codec_list); |
| 173 | |
| 174 | /* Create mutex. */ |
| 175 | status = pj_mutex_create_simple(gsm_codec_factory.pool, "gsm", |
| 176 | &gsm_codec_factory.mutex); |
| 177 | if (status != PJ_SUCCESS) |
| 178 | goto on_error; |
| 179 | |
| 180 | /* Get the codec manager. */ |
| 181 | codec_mgr = pjmedia_endpt_get_codec_mgr(endpt); |
| 182 | if (!codec_mgr) { |
| 183 | status = PJ_EINVALIDOP; |
| 184 | goto on_error; |
| 185 | } |
| 186 | |
| 187 | /* Register codec factory to endpoint. */ |
| 188 | status = pjmedia_codec_mgr_register_factory(codec_mgr, |
| 189 | &gsm_codec_factory.base); |
| 190 | if (status != PJ_SUCCESS) |
| 191 | goto on_error; |
| 192 | |
| 193 | /* Done. */ |
| 194 | return PJ_SUCCESS; |
| 195 | |
| 196 | on_error: |
| 197 | pj_pool_release(gsm_codec_factory.pool); |
| 198 | gsm_codec_factory.pool = NULL; |
| 199 | return status; |
| 200 | } |
| 201 | |
| 202 | |
| 203 | |
| 204 | /* |
| 205 | * Unregister GSM codec factory from pjmedia endpoint and deinitialize |
| 206 | * the GSM codec library. |
| 207 | */ |
| 208 | PJ_DEF(pj_status_t) pjmedia_codec_gsm_deinit(void) |
| 209 | { |
| 210 | pjmedia_codec_mgr *codec_mgr; |
| 211 | pj_status_t status; |
| 212 | |
| 213 | if (gsm_codec_factory.pool == NULL) |
| 214 | return PJ_SUCCESS; |
| 215 | |
| 216 | /* We don't want to deinit if there's outstanding codec. */ |
| 217 | /* This is silly, as we'll always have codec in the list if |
| 218 | we ever allocate a codec! A better behavior maybe is to |
| 219 | deallocate all codecs in the list. |
| 220 | pj_mutex_lock(gsm_codec_factory.mutex); |
| 221 | if (!pj_list_empty(&gsm_codec_factory.codec_list)) { |
| 222 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 223 | return PJ_EBUSY; |
| 224 | } |
| 225 | */ |
| 226 | |
| 227 | /* Get the codec manager. */ |
| 228 | codec_mgr = pjmedia_endpt_get_codec_mgr(gsm_codec_factory.endpt); |
| 229 | if (!codec_mgr) { |
| 230 | pj_pool_release(gsm_codec_factory.pool); |
| 231 | gsm_codec_factory.pool = NULL; |
| 232 | return PJ_EINVALIDOP; |
| 233 | } |
| 234 | |
| 235 | /* Unregister GSM codec factory. */ |
| 236 | status = pjmedia_codec_mgr_unregister_factory(codec_mgr, |
| 237 | &gsm_codec_factory.base); |
| 238 | |
| 239 | /* Destroy mutex. */ |
| 240 | pj_mutex_destroy(gsm_codec_factory.mutex); |
| 241 | |
| 242 | /* Destroy pool. */ |
| 243 | pj_pool_release(gsm_codec_factory.pool); |
| 244 | gsm_codec_factory.pool = NULL; |
| 245 | |
| 246 | return status; |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * Check if factory can allocate the specified codec. |
| 251 | */ |
| 252 | static pj_status_t gsm_test_alloc( pjmedia_codec_factory *factory, |
| 253 | const pjmedia_codec_info *info ) |
| 254 | { |
| 255 | PJ_UNUSED_ARG(factory); |
| 256 | |
| 257 | /* Check payload type. */ |
| 258 | if (info->pt != PJMEDIA_RTP_PT_GSM) |
| 259 | return PJMEDIA_CODEC_EUNSUP; |
| 260 | |
| 261 | /* Ignore the rest, since it's static payload type. */ |
| 262 | |
| 263 | return PJ_SUCCESS; |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Generate default attribute. |
| 268 | */ |
| 269 | static pj_status_t gsm_default_attr (pjmedia_codec_factory *factory, |
| 270 | const pjmedia_codec_info *id, |
| 271 | pjmedia_codec_param *attr ) |
| 272 | { |
| 273 | PJ_UNUSED_ARG(factory); |
| 274 | PJ_UNUSED_ARG(id); |
| 275 | |
| 276 | pj_bzero(attr, sizeof(pjmedia_codec_param)); |
| 277 | attr->info.clock_rate = 8000; |
| 278 | attr->info.channel_cnt = 1; |
| 279 | attr->info.avg_bps = 13200; |
| 280 | attr->info.max_bps = 13200; |
| 281 | attr->info.pcm_bits_per_sample = 16; |
| 282 | attr->info.frm_ptime = 20; |
| 283 | attr->info.pt = PJMEDIA_RTP_PT_GSM; |
| 284 | |
| 285 | attr->setting.frm_per_pkt = 1; |
| 286 | attr->setting.vad = 1; |
| 287 | #if !PLC_DISABLED |
| 288 | attr->setting.plc = 1; |
| 289 | #endif |
| 290 | |
| 291 | /* Default all other flag bits disabled. */ |
| 292 | |
| 293 | return PJ_SUCCESS; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Enum codecs supported by this factory (i.e. only GSM!). |
| 298 | */ |
| 299 | static pj_status_t gsm_enum_codecs(pjmedia_codec_factory *factory, |
| 300 | unsigned *count, |
| 301 | pjmedia_codec_info codecs[]) |
| 302 | { |
| 303 | PJ_UNUSED_ARG(factory); |
| 304 | PJ_ASSERT_RETURN(codecs && *count > 0, PJ_EINVAL); |
| 305 | |
| 306 | pj_bzero(&codecs[0], sizeof(pjmedia_codec_info)); |
| 307 | codecs[0].encoding_name = pj_str("GSM"); |
| 308 | codecs[0].pt = PJMEDIA_RTP_PT_GSM; |
| 309 | codecs[0].type = PJMEDIA_TYPE_AUDIO; |
| 310 | codecs[0].clock_rate = 8000; |
| 311 | codecs[0].channel_cnt = 1; |
| 312 | |
| 313 | *count = 1; |
| 314 | |
| 315 | return PJ_SUCCESS; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Allocate a new GSM codec instance. |
| 320 | */ |
| 321 | static pj_status_t gsm_alloc_codec( pjmedia_codec_factory *factory, |
| 322 | const pjmedia_codec_info *id, |
| 323 | pjmedia_codec **p_codec) |
| 324 | { |
| 325 | pjmedia_codec *codec; |
| 326 | struct gsm_data *gsm_data; |
| 327 | pj_status_t status; |
| 328 | |
| 329 | PJ_ASSERT_RETURN(factory && id && p_codec, PJ_EINVAL); |
| 330 | PJ_ASSERT_RETURN(factory == &gsm_codec_factory.base, PJ_EINVAL); |
| 331 | |
| 332 | |
| 333 | pj_mutex_lock(gsm_codec_factory.mutex); |
| 334 | |
| 335 | /* Get free nodes, if any. */ |
| 336 | if (!pj_list_empty(&gsm_codec_factory.codec_list)) { |
| 337 | codec = gsm_codec_factory.codec_list.next; |
| 338 | pj_list_erase(codec); |
| 339 | } else { |
| 340 | codec = PJ_POOL_ZALLOC_T(gsm_codec_factory.pool, pjmedia_codec); |
| 341 | PJ_ASSERT_RETURN(codec != NULL, PJ_ENOMEM); |
| 342 | codec->op = &gsm_op; |
| 343 | codec->factory = factory; |
| 344 | |
| 345 | gsm_data = PJ_POOL_ZALLOC_T(gsm_codec_factory.pool, struct gsm_data); |
| 346 | codec->codec_data = gsm_data; |
| 347 | |
| 348 | #if !PLC_DISABLED |
| 349 | /* Create PLC */ |
| 350 | status = pjmedia_plc_create(gsm_codec_factory.pool, 8000, |
| 351 | 160, 0, &gsm_data->plc); |
| 352 | if (status != PJ_SUCCESS) { |
| 353 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 354 | return status; |
| 355 | } |
| 356 | #endif |
| 357 | |
| 358 | /* Create silence detector */ |
| 359 | status = pjmedia_silence_det_create(gsm_codec_factory.pool, |
| 360 | 8000, 160, |
| 361 | &gsm_data->vad); |
| 362 | if (status != PJ_SUCCESS) { |
| 363 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 364 | return status; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 369 | |
| 370 | *p_codec = codec; |
| 371 | return PJ_SUCCESS; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Free codec. |
| 376 | */ |
| 377 | static pj_status_t gsm_dealloc_codec( pjmedia_codec_factory *factory, |
| 378 | pjmedia_codec *codec ) |
| 379 | { |
| 380 | struct gsm_data *gsm_data; |
| 381 | int i; |
| 382 | |
| 383 | PJ_ASSERT_RETURN(factory && codec, PJ_EINVAL); |
| 384 | PJ_ASSERT_RETURN(factory == &gsm_codec_factory.base, PJ_EINVAL); |
| 385 | |
| 386 | gsm_data = (struct gsm_data*) codec->codec_data; |
| 387 | |
| 388 | /* Close codec, if it's not closed. */ |
| 389 | gsm_codec_close(codec); |
| 390 | |
| 391 | #if !PLC_DISABLED |
| 392 | /* Clear left samples in the PLC, since codec+plc will be reused |
| 393 | * next time. |
| 394 | */ |
| 395 | for (i=0; i<2; ++i) { |
| 396 | pj_int16_t frame[160]; |
| 397 | pjmedia_zero_samples(frame, PJ_ARRAY_SIZE(frame)); |
| 398 | pjmedia_plc_save(gsm_data->plc, frame); |
| 399 | } |
| 400 | #else |
| 401 | PJ_UNUSED_ARG(i); |
| 402 | #endif |
| 403 | |
| 404 | /* Re-init silence_period */ |
| 405 | pj_set_timestamp32(&gsm_data->last_tx, 0, 0); |
| 406 | |
| 407 | /* Put in the free list. */ |
| 408 | pj_mutex_lock(gsm_codec_factory.mutex); |
| 409 | pj_list_push_front(&gsm_codec_factory.codec_list, codec); |
| 410 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 411 | |
| 412 | return PJ_SUCCESS; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Init codec. |
| 417 | */ |
| 418 | static pj_status_t gsm_codec_init( pjmedia_codec *codec, |
| 419 | pj_pool_t *pool ) |
| 420 | { |
| 421 | PJ_UNUSED_ARG(codec); |
| 422 | PJ_UNUSED_ARG(pool); |
| 423 | return PJ_SUCCESS; |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Open codec. |
| 428 | */ |
| 429 | static pj_status_t gsm_codec_open( pjmedia_codec *codec, |
| 430 | pjmedia_codec_param *attr ) |
| 431 | { |
| 432 | struct gsm_data *gsm_data = (struct gsm_data*) codec->codec_data; |
| 433 | |
| 434 | pj_assert(gsm_data != NULL); |
| 435 | pj_assert(gsm_data->encoder == NULL && gsm_data->decoder == NULL); |
| 436 | |
| 437 | gsm_data->encoder = gsm_create(); |
| 438 | if (!gsm_data->encoder) |
| 439 | return PJMEDIA_CODEC_EFAILED; |
| 440 | |
| 441 | gsm_data->decoder = gsm_create(); |
| 442 | if (!gsm_data->decoder) |
| 443 | return PJMEDIA_CODEC_EFAILED; |
| 444 | |
| 445 | gsm_data->vad_enabled = (attr->setting.vad != 0); |
| 446 | gsm_data->plc_enabled = (attr->setting.plc != 0); |
| 447 | |
| 448 | return PJ_SUCCESS; |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * Close codec. |
| 453 | */ |
| 454 | static pj_status_t gsm_codec_close( pjmedia_codec *codec ) |
| 455 | { |
| 456 | struct gsm_data *gsm_data = (struct gsm_data*) codec->codec_data; |
| 457 | |
| 458 | pj_assert(gsm_data != NULL); |
| 459 | |
| 460 | if (gsm_data->encoder) { |
| 461 | gsm_destroy(gsm_data->encoder); |
| 462 | gsm_data->encoder = NULL; |
| 463 | } |
| 464 | if (gsm_data->decoder) { |
| 465 | gsm_destroy(gsm_data->decoder); |
| 466 | gsm_data->decoder = NULL; |
| 467 | } |
| 468 | |
| 469 | return PJ_SUCCESS; |
| 470 | } |
| 471 | |
| 472 | |
| 473 | /* |
| 474 | * Modify codec settings. |
| 475 | */ |
| 476 | static pj_status_t gsm_codec_modify(pjmedia_codec *codec, |
| 477 | const pjmedia_codec_param *attr ) |
| 478 | { |
| 479 | struct gsm_data *gsm_data = (struct gsm_data*) codec->codec_data; |
| 480 | |
| 481 | pj_assert(gsm_data != NULL); |
| 482 | pj_assert(gsm_data->encoder != NULL && gsm_data->decoder != NULL); |
| 483 | |
| 484 | gsm_data->vad_enabled = (attr->setting.vad != 0); |
| 485 | gsm_data->plc_enabled = (attr->setting.plc != 0); |
| 486 | |
| 487 | return PJ_SUCCESS; |
| 488 | } |
| 489 | |
| 490 | |
| 491 | /* |
| 492 | * Get frames in the packet. |
| 493 | */ |
| 494 | static pj_status_t gsm_codec_parse( pjmedia_codec *codec, |
| 495 | void *pkt, |
| 496 | pj_size_t pkt_size, |
| 497 | const pj_timestamp *ts, |
| 498 | unsigned *frame_cnt, |
| 499 | pjmedia_frame frames[]) |
| 500 | { |
| 501 | unsigned count = 0; |
| 502 | |
| 503 | PJ_UNUSED_ARG(codec); |
| 504 | |
| 505 | PJ_ASSERT_RETURN(frame_cnt, PJ_EINVAL); |
| 506 | |
| 507 | while (pkt_size >= 33 && count < *frame_cnt) { |
| 508 | frames[count].type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 509 | frames[count].buf = pkt; |
| 510 | frames[count].size = 33; |
| 511 | frames[count].timestamp.u64 = ts->u64 + count * 160; |
| 512 | |
| 513 | pkt = ((char*)pkt) + 33; |
| 514 | pkt_size -= 33; |
| 515 | |
| 516 | ++count; |
| 517 | } |
| 518 | |
| 519 | *frame_cnt = count; |
| 520 | return PJ_SUCCESS; |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Encode frame. |
| 525 | */ |
| 526 | static pj_status_t gsm_codec_encode( pjmedia_codec *codec, |
| 527 | const struct pjmedia_frame *input, |
| 528 | unsigned output_buf_len, |
| 529 | struct pjmedia_frame *output) |
| 530 | { |
| 531 | struct gsm_data *gsm_data = (struct gsm_data*) codec->codec_data; |
| 532 | pj_int16_t *pcm_in; |
| 533 | pj_size_t in_size; |
| 534 | |
| 535 | pj_assert(gsm_data && input && output); |
| 536 | |
| 537 | pcm_in = (pj_int16_t*)input->buf; |
| 538 | in_size = input->size; |
| 539 | |
| 540 | PJ_ASSERT_RETURN(in_size % 320 == 0, PJMEDIA_CODEC_EPCMFRMINLEN); |
| 541 | PJ_ASSERT_RETURN(output_buf_len >= 33 * in_size/320, |
| 542 | PJMEDIA_CODEC_EFRMTOOSHORT); |
| 543 | |
| 544 | /* Detect silence */ |
| 545 | if (gsm_data->vad_enabled) { |
| 546 | pj_bool_t is_silence; |
| 547 | pj_int32_t silence_duration; |
| 548 | |
| 549 | silence_duration = pj_timestamp_diff32(&gsm_data->last_tx, |
| 550 | &input->timestamp); |
| 551 | |
| 552 | is_silence = pjmedia_silence_det_detect(gsm_data->vad, |
| 553 | (const pj_int16_t*) input->buf, |
| 554 | (input->size >> 1), |
| 555 | NULL); |
| 556 | if (is_silence && |
| 557 | (PJMEDIA_CODEC_MAX_SILENCE_PERIOD == -1 || |
| 558 | silence_duration < PJMEDIA_CODEC_MAX_SILENCE_PERIOD*8000/1000)) |
| 559 | { |
| 560 | output->type = PJMEDIA_FRAME_TYPE_NONE; |
| 561 | output->buf = NULL; |
| 562 | output->size = 0; |
| 563 | output->timestamp = input->timestamp; |
| 564 | return PJ_SUCCESS; |
| 565 | } else { |
| 566 | gsm_data->last_tx = input->timestamp; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | /* Encode */ |
| 571 | output->size = 0; |
| 572 | while (in_size >= 320) { |
| 573 | gsm_encode(gsm_data->encoder, pcm_in, |
| 574 | (unsigned char*)output->buf + output->size); |
| 575 | pcm_in += 160; |
| 576 | output->size += 33; |
| 577 | in_size -= 320; |
| 578 | } |
| 579 | |
| 580 | output->type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 581 | output->timestamp = input->timestamp; |
| 582 | |
| 583 | return PJ_SUCCESS; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Decode frame. |
| 588 | */ |
| 589 | static pj_status_t gsm_codec_decode( pjmedia_codec *codec, |
| 590 | const struct pjmedia_frame *input, |
| 591 | unsigned output_buf_len, |
| 592 | struct pjmedia_frame *output) |
| 593 | { |
| 594 | struct gsm_data *gsm_data = (struct gsm_data*) codec->codec_data; |
| 595 | |
| 596 | pj_assert(gsm_data != NULL); |
| 597 | PJ_ASSERT_RETURN(input && output, PJ_EINVAL); |
| 598 | |
| 599 | if (output_buf_len < 320) |
| 600 | return PJMEDIA_CODEC_EPCMTOOSHORT; |
| 601 | |
| 602 | if (input->size < 33) |
| 603 | return PJMEDIA_CODEC_EFRMTOOSHORT; |
| 604 | |
| 605 | gsm_decode(gsm_data->decoder, |
| 606 | (unsigned char*)input->buf, |
| 607 | (short*)output->buf); |
| 608 | |
| 609 | output->size = 320; |
| 610 | output->type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 611 | output->timestamp = input->timestamp; |
| 612 | |
| 613 | #if !PLC_DISABLED |
| 614 | if (gsm_data->plc_enabled) |
| 615 | pjmedia_plc_save( gsm_data->plc, (pj_int16_t*)output->buf); |
| 616 | #endif |
| 617 | |
| 618 | return PJ_SUCCESS; |
| 619 | } |
| 620 | |
| 621 | |
| 622 | #if !PLC_DISABLED |
| 623 | /* |
| 624 | * Recover lost frame. |
| 625 | */ |
| 626 | static pj_status_t gsm_codec_recover(pjmedia_codec *codec, |
| 627 | unsigned output_buf_len, |
| 628 | struct pjmedia_frame *output) |
| 629 | { |
| 630 | struct gsm_data *gsm_data = (struct gsm_data*) codec->codec_data; |
| 631 | |
| 632 | PJ_ASSERT_RETURN(gsm_data->plc_enabled, PJ_EINVALIDOP); |
| 633 | |
| 634 | PJ_ASSERT_RETURN(output_buf_len >= 320, PJMEDIA_CODEC_EPCMTOOSHORT); |
| 635 | |
| 636 | pjmedia_plc_generate(gsm_data->plc, (pj_int16_t*)output->buf); |
| 637 | output->size = 320; |
| 638 | |
| 639 | return PJ_SUCCESS; |
| 640 | } |
| 641 | #endif |
| 642 | |
| 643 | |
| 644 | #endif /* PJMEDIA_HAS_GSM_CODEC */ |
| 645 | |