Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C)2003-2006 Benny Prijono <benny@prijono.org> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #include <pjmedia-codec/gsm.h> |
| 20 | #include <pjmedia/codec.h> |
| 21 | #include <pjmedia/errno.h> |
| 22 | #include <pjmedia/endpoint.h> |
Benny Prijono | f04ffdd | 2006-02-21 00:11:18 +0000 | [diff] [blame] | 23 | #include <pjmedia/port.h> |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 24 | #include <pj/assert.h> |
| 25 | #include <pj/pool.h> |
| 26 | #include <pj/string.h> |
| 27 | #include <pj/os.h> |
| 28 | #include "gsm/gsm.h" |
| 29 | |
| 30 | /* Prototypes for GSM factory */ |
| 31 | static pj_status_t gsm_test_alloc( pjmedia_codec_factory *factory, |
| 32 | const pjmedia_codec_info *id ); |
| 33 | static pj_status_t gsm_default_attr( pjmedia_codec_factory *factory, |
| 34 | const pjmedia_codec_info *id, |
| 35 | pjmedia_codec_param *attr ); |
| 36 | static pj_status_t gsm_enum_codecs( pjmedia_codec_factory *factory, |
| 37 | unsigned *count, |
| 38 | pjmedia_codec_info codecs[]); |
| 39 | static pj_status_t gsm_alloc_codec( pjmedia_codec_factory *factory, |
| 40 | const pjmedia_codec_info *id, |
| 41 | pjmedia_codec **p_codec); |
| 42 | static pj_status_t gsm_dealloc_codec( pjmedia_codec_factory *factory, |
| 43 | pjmedia_codec *codec ); |
| 44 | |
| 45 | /* Prototypes for GSM implementation. */ |
| 46 | static pj_status_t gsm_codec_default_attr(pjmedia_codec *codec, |
| 47 | pjmedia_codec_param *attr); |
| 48 | static pj_status_t gsm_codec_init( pjmedia_codec *codec, |
| 49 | pj_pool_t *pool ); |
| 50 | static pj_status_t gsm_codec_open( pjmedia_codec *codec, |
| 51 | pjmedia_codec_param *attr ); |
| 52 | static pj_status_t gsm_codec_close( pjmedia_codec *codec ); |
| 53 | static pj_status_t gsm_codec_get_frames( pjmedia_codec *codec, |
| 54 | void *pkt, |
| 55 | pj_size_t pkt_size, |
| 56 | unsigned *frame_cnt, |
| 57 | pjmedia_frame frames[]); |
| 58 | static pj_status_t gsm_codec_encode( pjmedia_codec *codec, |
| 59 | const struct pjmedia_frame *input, |
| 60 | unsigned output_buf_len, |
| 61 | struct pjmedia_frame *output); |
| 62 | static pj_status_t gsm_codec_decode( pjmedia_codec *codec, |
| 63 | const struct pjmedia_frame *input, |
| 64 | unsigned output_buf_len, |
| 65 | struct pjmedia_frame *output); |
| 66 | |
| 67 | /* Definition for GSM codec operations. */ |
| 68 | static pjmedia_codec_op gsm_op = |
| 69 | { |
| 70 | &gsm_codec_default_attr, |
| 71 | &gsm_codec_init, |
| 72 | &gsm_codec_open, |
| 73 | &gsm_codec_close, |
| 74 | &gsm_codec_get_frames, |
| 75 | &gsm_codec_encode, |
| 76 | &gsm_codec_decode |
| 77 | }; |
| 78 | |
| 79 | /* Definition for GSM codec factory operations. */ |
| 80 | static pjmedia_codec_factory_op gsm_factory_op = |
| 81 | { |
| 82 | &gsm_test_alloc, |
| 83 | &gsm_default_attr, |
| 84 | &gsm_enum_codecs, |
| 85 | &gsm_alloc_codec, |
| 86 | &gsm_dealloc_codec |
| 87 | }; |
| 88 | |
| 89 | /* GSM factory */ |
| 90 | static struct gsm_codec_factory |
| 91 | { |
| 92 | pjmedia_codec_factory base; |
| 93 | pjmedia_endpt *endpt; |
| 94 | pj_pool_t *pool; |
| 95 | pj_mutex_t *mutex; |
| 96 | pjmedia_codec codec_list; |
| 97 | } gsm_codec_factory; |
| 98 | |
| 99 | /* GSM codec private data. */ |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 100 | struct gsm_data |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 101 | { |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 102 | void *encoder; |
| 103 | void *decoder; |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | |
| 107 | |
| 108 | /* |
| 109 | * Initialize and register GSM codec factory to pjmedia endpoint. |
| 110 | */ |
| 111 | PJ_DEF(pj_status_t) pjmedia_codec_gsm_init( pjmedia_endpt *endpt ) |
| 112 | { |
| 113 | pjmedia_codec_mgr *codec_mgr; |
| 114 | pj_status_t status; |
| 115 | |
| 116 | if (gsm_codec_factory.pool != NULL) |
| 117 | return PJ_SUCCESS; |
| 118 | |
| 119 | /* Create GSM codec factory. */ |
| 120 | gsm_codec_factory.base.op = &gsm_factory_op; |
| 121 | gsm_codec_factory.base.factory_data = NULL; |
| 122 | gsm_codec_factory.endpt = endpt; |
| 123 | |
| 124 | gsm_codec_factory.pool = pjmedia_endpt_create_pool(endpt, "gsm", 4000, |
| 125 | 4000); |
| 126 | if (!gsm_codec_factory.pool) |
| 127 | return PJ_ENOMEM; |
| 128 | |
| 129 | pj_list_init(&gsm_codec_factory.codec_list); |
| 130 | |
| 131 | /* Create mutex. */ |
| 132 | status = pj_mutex_create_simple(gsm_codec_factory.pool, "gsm", |
| 133 | &gsm_codec_factory.mutex); |
| 134 | if (status != PJ_SUCCESS) |
| 135 | goto on_error; |
| 136 | |
| 137 | /* Get the codec manager. */ |
| 138 | codec_mgr = pjmedia_endpt_get_codec_mgr(endpt); |
| 139 | if (!codec_mgr) { |
| 140 | status = PJ_EINVALIDOP; |
| 141 | goto on_error; |
| 142 | } |
| 143 | |
| 144 | /* Register codec factory to endpoint. */ |
| 145 | status = pjmedia_codec_mgr_register_factory(codec_mgr, |
| 146 | &gsm_codec_factory.base); |
| 147 | if (status != PJ_SUCCESS) |
| 148 | goto on_error; |
| 149 | |
| 150 | /* Done. */ |
| 151 | return PJ_SUCCESS; |
| 152 | |
| 153 | on_error: |
| 154 | pj_pool_release(gsm_codec_factory.pool); |
| 155 | gsm_codec_factory.pool = NULL; |
| 156 | return status; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | |
| 161 | /* |
| 162 | * Unregister GSM codec factory from pjmedia endpoint and deinitialize |
| 163 | * the GSM codec library. |
| 164 | */ |
| 165 | PJ_DEF(pj_status_t) pjmedia_codec_gsm_deinit(void) |
| 166 | { |
| 167 | pjmedia_codec_mgr *codec_mgr; |
| 168 | pj_status_t status; |
| 169 | |
| 170 | if (gsm_codec_factory.pool == NULL) |
| 171 | return PJ_SUCCESS; |
| 172 | |
| 173 | /* We don't want to deinit if there's outstanding codec. */ |
| 174 | pj_mutex_lock(gsm_codec_factory.mutex); |
| 175 | if (!pj_list_empty(&gsm_codec_factory.codec_list)) { |
| 176 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 177 | return PJ_EBUSY; |
| 178 | } |
| 179 | |
| 180 | /* Get the codec manager. */ |
| 181 | codec_mgr = pjmedia_endpt_get_codec_mgr(gsm_codec_factory.endpt); |
| 182 | if (!codec_mgr) { |
| 183 | pj_pool_release(gsm_codec_factory.pool); |
| 184 | gsm_codec_factory.pool = NULL; |
| 185 | return PJ_EINVALIDOP; |
| 186 | } |
| 187 | |
| 188 | /* Unregister GSM codec factory. */ |
| 189 | status = pjmedia_codec_mgr_unregister_factory(codec_mgr, |
| 190 | &gsm_codec_factory.base); |
| 191 | |
| 192 | /* Destroy mutex. */ |
| 193 | pj_mutex_destroy(gsm_codec_factory.mutex); |
| 194 | |
| 195 | /* Destroy pool. */ |
| 196 | pj_pool_release(gsm_codec_factory.pool); |
| 197 | gsm_codec_factory.pool = NULL; |
| 198 | |
| 199 | return status; |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * Check if factory can allocate the specified codec. |
| 204 | */ |
| 205 | static pj_status_t gsm_test_alloc( pjmedia_codec_factory *factory, |
| 206 | const pjmedia_codec_info *info ) |
| 207 | { |
| 208 | PJ_UNUSED_ARG(factory); |
| 209 | |
| 210 | /* Check payload type. */ |
| 211 | if (info->pt != PJMEDIA_RTP_PT_GSM) |
| 212 | return PJMEDIA_CODEC_EUNSUP; |
| 213 | |
| 214 | /* Ignore the rest, since it's static payload type. */ |
| 215 | |
| 216 | return PJ_SUCCESS; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Generate default attribute. |
| 221 | */ |
| 222 | static pj_status_t gsm_default_attr (pjmedia_codec_factory *factory, |
| 223 | const pjmedia_codec_info *id, |
| 224 | pjmedia_codec_param *attr ) |
| 225 | { |
| 226 | PJ_UNUSED_ARG(factory); |
| 227 | PJ_UNUSED_ARG(id); |
| 228 | |
| 229 | pj_memset(attr, 0, sizeof(pjmedia_codec_param)); |
| 230 | attr->sample_rate = 8000; |
| 231 | attr->avg_bps = 13200; |
| 232 | attr->pcm_bits_per_sample = 16; |
| 233 | attr->ptime = 20; |
| 234 | attr->pt = PJMEDIA_RTP_PT_GSM; |
| 235 | |
| 236 | /* Default all flag bits disabled. */ |
| 237 | |
| 238 | return PJ_SUCCESS; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * Enum codecs supported by this factory (i.e. only GSM!). |
| 243 | */ |
| 244 | static pj_status_t gsm_enum_codecs(pjmedia_codec_factory *factory, |
| 245 | unsigned *count, |
| 246 | pjmedia_codec_info codecs[]) |
| 247 | { |
| 248 | PJ_UNUSED_ARG(factory); |
| 249 | PJ_ASSERT_RETURN(codecs && *count > 0, PJ_EINVAL); |
| 250 | |
| 251 | pj_memset(&codecs[0], 0, sizeof(pjmedia_codec_info)); |
| 252 | codecs[0].encoding_name = pj_str("GSM"); |
| 253 | codecs[0].pt = PJMEDIA_RTP_PT_GSM; |
| 254 | codecs[0].type = PJMEDIA_TYPE_AUDIO; |
| 255 | codecs[0].sample_rate = 8000; |
| 256 | |
| 257 | *count = 1; |
| 258 | |
| 259 | return PJ_SUCCESS; |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Allocate a new GSM codec instance. |
| 264 | */ |
| 265 | static pj_status_t gsm_alloc_codec( pjmedia_codec_factory *factory, |
| 266 | const pjmedia_codec_info *id, |
| 267 | pjmedia_codec **p_codec) |
| 268 | { |
| 269 | pjmedia_codec *codec; |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 270 | struct gsm_data *gsm_data; |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 271 | |
| 272 | PJ_ASSERT_RETURN(factory && id && p_codec, PJ_EINVAL); |
| 273 | PJ_ASSERT_RETURN(factory == &gsm_codec_factory.base, PJ_EINVAL); |
| 274 | |
| 275 | |
| 276 | pj_mutex_lock(gsm_codec_factory.mutex); |
| 277 | |
| 278 | /* Get free nodes, if any. */ |
| 279 | if (!pj_list_empty(&gsm_codec_factory.codec_list)) { |
| 280 | codec = gsm_codec_factory.codec_list.next; |
| 281 | pj_list_erase(codec); |
| 282 | } else { |
| 283 | codec = pj_pool_zalloc(gsm_codec_factory.pool, |
| 284 | sizeof(pjmedia_codec)); |
| 285 | PJ_ASSERT_RETURN(codec != NULL, PJ_ENOMEM); |
Benny Prijono | f80b1bf | 2006-02-19 02:24:27 +0000 | [diff] [blame] | 286 | codec->op = &gsm_op; |
| 287 | codec->factory = factory; |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 288 | |
| 289 | gsm_data = pj_pool_zalloc(gsm_codec_factory.pool, |
| 290 | sizeof(struct gsm_data)); |
| 291 | codec->codec_data = gsm_data; |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 295 | |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 296 | *p_codec = codec; |
| 297 | return PJ_SUCCESS; |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Free codec. |
| 302 | */ |
| 303 | static pj_status_t gsm_dealloc_codec( pjmedia_codec_factory *factory, |
| 304 | pjmedia_codec *codec ) |
| 305 | { |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 306 | struct gsm_data *gsm_data; |
| 307 | |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 308 | PJ_ASSERT_RETURN(factory && codec, PJ_EINVAL); |
| 309 | PJ_ASSERT_RETURN(factory == &gsm_codec_factory.base, PJ_EINVAL); |
| 310 | |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 311 | gsm_data = codec->codec_data; |
| 312 | |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 313 | /* Close codec, if it's not closed. */ |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 314 | gsm_codec_close(codec); |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 315 | |
| 316 | /* Put in the free list. */ |
| 317 | pj_mutex_lock(gsm_codec_factory.mutex); |
| 318 | pj_list_push_front(&gsm_codec_factory.codec_list, codec); |
| 319 | pj_mutex_unlock(gsm_codec_factory.mutex); |
| 320 | |
| 321 | return PJ_SUCCESS; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Get codec default attributes. |
| 326 | */ |
| 327 | static pj_status_t gsm_codec_default_attr( pjmedia_codec *codec, |
| 328 | pjmedia_codec_param *attr) |
| 329 | { |
| 330 | return gsm_default_attr( codec->factory, NULL, attr); |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Init codec. |
| 335 | */ |
| 336 | static pj_status_t gsm_codec_init( pjmedia_codec *codec, |
| 337 | pj_pool_t *pool ) |
| 338 | { |
| 339 | PJ_UNUSED_ARG(codec); |
| 340 | PJ_UNUSED_ARG(pool); |
| 341 | return PJ_SUCCESS; |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Open codec. |
| 346 | */ |
| 347 | static pj_status_t gsm_codec_open( pjmedia_codec *codec, |
| 348 | pjmedia_codec_param *attr ) |
| 349 | { |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 350 | struct gsm_data *gsm_data = codec->codec_data; |
| 351 | |
| 352 | pj_assert(gsm_data != NULL); |
| 353 | pj_assert(gsm_data->encoder == NULL && gsm_data->decoder == NULL); |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 354 | |
| 355 | PJ_UNUSED_ARG(attr); |
| 356 | |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 357 | gsm_data->encoder = gsm_create(); |
| 358 | if (!gsm_data->encoder) |
| 359 | return PJMEDIA_CODEC_EFAILED; |
| 360 | |
| 361 | gsm_data->decoder = gsm_create(); |
| 362 | if (!gsm_data->decoder) |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 363 | return PJMEDIA_CODEC_EFAILED; |
| 364 | |
| 365 | return PJ_SUCCESS; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Close codec. |
| 370 | */ |
| 371 | static pj_status_t gsm_codec_close( pjmedia_codec *codec ) |
| 372 | { |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 373 | struct gsm_data *gsm_data = codec->codec_data; |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 374 | |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 375 | pj_assert(gsm_data != NULL); |
| 376 | |
| 377 | if (gsm_data->encoder) { |
| 378 | gsm_destroy(gsm_data->encoder); |
| 379 | gsm_data->encoder = NULL; |
| 380 | } |
| 381 | if (gsm_data->decoder) { |
| 382 | gsm_destroy(gsm_data->decoder); |
| 383 | gsm_data->decoder = NULL; |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | return PJ_SUCCESS; |
| 387 | } |
| 388 | |
| 389 | |
| 390 | /* |
| 391 | * Get frames in the packet. |
| 392 | */ |
| 393 | static pj_status_t gsm_codec_get_frames( pjmedia_codec *codec, |
| 394 | void *pkt, |
| 395 | pj_size_t pkt_size, |
| 396 | unsigned *frame_cnt, |
| 397 | pjmedia_frame frames[]) |
| 398 | { |
| 399 | unsigned count = 0; |
| 400 | |
| 401 | PJ_UNUSED_ARG(codec); |
| 402 | |
| 403 | PJ_ASSERT_RETURN(frame_cnt, PJ_EINVAL); |
| 404 | |
| 405 | while (pkt_size >= 33 && count < *frame_cnt) { |
| 406 | frames[0].type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 407 | frames[0].buf = pkt; |
| 408 | frames[0].size = 33; |
| 409 | |
| 410 | pkt = ((char*)pkt) + 33; |
| 411 | pkt_size -= 33; |
| 412 | |
| 413 | ++count; |
| 414 | } |
| 415 | |
| 416 | *frame_cnt = count; |
| 417 | return PJ_SUCCESS; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Encode frame. |
| 422 | */ |
| 423 | static pj_status_t gsm_codec_encode( pjmedia_codec *codec, |
| 424 | const struct pjmedia_frame *input, |
| 425 | unsigned output_buf_len, |
| 426 | struct pjmedia_frame *output) |
| 427 | { |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 428 | struct gsm_data *gsm_data = codec->codec_data; |
| 429 | |
| 430 | pj_assert(gsm_data != NULL); |
| 431 | PJ_ASSERT_RETURN(input && output, PJ_EINVAL); |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 432 | |
| 433 | if (output_buf_len < 33) |
| 434 | return PJMEDIA_CODEC_EFRMTOOSHORT; |
| 435 | |
| 436 | if (input->size < 320) |
| 437 | return PJMEDIA_CODEC_EPCMTOOSHORT; |
| 438 | |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 439 | gsm_encode(gsm_data->encoder, (short*)input->buf, |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 440 | (unsigned char*)output->buf); |
| 441 | |
| 442 | output->size = 33; |
| 443 | output->type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 444 | |
| 445 | return PJ_SUCCESS; |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Decode frame. |
| 450 | */ |
| 451 | static pj_status_t gsm_codec_decode( pjmedia_codec *codec, |
| 452 | const struct pjmedia_frame *input, |
| 453 | unsigned output_buf_len, |
| 454 | struct pjmedia_frame *output) |
| 455 | { |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 456 | struct gsm_data *gsm_data = codec->codec_data; |
| 457 | |
| 458 | pj_assert(gsm_data != NULL); |
| 459 | PJ_ASSERT_RETURN(input && output, PJ_EINVAL); |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 460 | |
| 461 | if (output_buf_len < 320) |
| 462 | return PJMEDIA_CODEC_EPCMTOOSHORT; |
| 463 | |
| 464 | if (input->size < 33) |
| 465 | return PJMEDIA_CODEC_EFRMTOOSHORT; |
| 466 | |
Benny Prijono | f93895c | 2006-03-05 11:50:53 +0000 | [diff] [blame] | 467 | gsm_decode(gsm_data->decoder, |
Benny Prijono | f80b1bf | 2006-02-19 02:24:27 +0000 | [diff] [blame] | 468 | (unsigned char*)input->buf, |
Benny Prijono | a4bf021 | 2006-02-10 15:57:08 +0000 | [diff] [blame] | 469 | (short*)output->buf); |
| 470 | |
| 471 | output->size = 320; |
| 472 | output->type = PJMEDIA_FRAME_TYPE_AUDIO; |
| 473 | |
| 474 | return PJ_SUCCESS; |
| 475 | } |