Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id: null_dev.c 3553 2011-05-05 06:14:19Z nanang $ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 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-audiodev/audiodev_imp.h> |
| 20 | #include <pj/assert.h> |
| 21 | #include <pj/log.h> |
| 22 | #include <pj/os.h> |
| 23 | |
| 24 | #if PJMEDIA_AUDIO_DEV_HAS_NULL_AUDIO |
| 25 | |
| 26 | #define THIS_FILE "null_dev.c" |
| 27 | |
| 28 | /* null_audio device info */ |
| 29 | struct null_audio_dev_info |
| 30 | { |
| 31 | pjmedia_aud_dev_info info; |
| 32 | unsigned dev_id; |
| 33 | }; |
| 34 | |
| 35 | /* null_audio factory */ |
| 36 | struct null_audio_factory |
| 37 | { |
| 38 | pjmedia_aud_dev_factory base; |
| 39 | pj_pool_t *pool; |
| 40 | pj_pool_factory *pf; |
| 41 | |
| 42 | unsigned dev_count; |
| 43 | struct null_audio_dev_info *dev_info; |
| 44 | }; |
| 45 | |
| 46 | /* Sound stream. */ |
| 47 | struct null_audio_stream |
| 48 | { |
| 49 | pjmedia_aud_stream base; /**< Base stream */ |
| 50 | pjmedia_aud_param param; /**< Settings */ |
| 51 | pj_pool_t *pool; /**< Memory pool. */ |
| 52 | |
| 53 | pjmedia_aud_rec_cb rec_cb; /**< Capture callback. */ |
| 54 | pjmedia_aud_play_cb play_cb; /**< Playback callback. */ |
| 55 | void *user_data; /**< Application data. */ |
| 56 | }; |
| 57 | |
| 58 | |
| 59 | /* Prototypes */ |
| 60 | static pj_status_t null_factory_init(pjmedia_aud_dev_factory *f); |
| 61 | static pj_status_t null_factory_destroy(pjmedia_aud_dev_factory *f); |
| 62 | static pj_status_t null_factory_refresh(pjmedia_aud_dev_factory *f); |
| 63 | static unsigned null_factory_get_dev_count(pjmedia_aud_dev_factory *f); |
| 64 | static pj_status_t null_factory_get_dev_info(pjmedia_aud_dev_factory *f, |
| 65 | unsigned index, |
| 66 | pjmedia_aud_dev_info *info); |
| 67 | static pj_status_t null_factory_default_param(pjmedia_aud_dev_factory *f, |
| 68 | unsigned index, |
| 69 | pjmedia_aud_param *param); |
| 70 | static pj_status_t null_factory_create_stream(pjmedia_aud_dev_factory *f, |
| 71 | const pjmedia_aud_param *param, |
| 72 | pjmedia_aud_rec_cb rec_cb, |
| 73 | pjmedia_aud_play_cb play_cb, |
| 74 | void *user_data, |
| 75 | pjmedia_aud_stream **p_aud_strm); |
| 76 | |
| 77 | static pj_status_t null_stream_get_param(pjmedia_aud_stream *strm, |
| 78 | pjmedia_aud_param *param); |
| 79 | static pj_status_t null_stream_get_cap(pjmedia_aud_stream *strm, |
| 80 | pjmedia_aud_dev_cap cap, |
| 81 | void *value); |
| 82 | static pj_status_t null_stream_set_cap(pjmedia_aud_stream *strm, |
| 83 | pjmedia_aud_dev_cap cap, |
| 84 | const void *value); |
| 85 | static pj_status_t null_stream_start(pjmedia_aud_stream *strm); |
| 86 | static pj_status_t null_stream_stop(pjmedia_aud_stream *strm); |
| 87 | static pj_status_t null_stream_destroy(pjmedia_aud_stream *strm); |
| 88 | |
| 89 | /* Operations */ |
| 90 | static pjmedia_aud_dev_factory_op factory_op = |
| 91 | { |
| 92 | &null_factory_init, |
| 93 | &null_factory_destroy, |
| 94 | &null_factory_get_dev_count, |
| 95 | &null_factory_get_dev_info, |
| 96 | &null_factory_default_param, |
| 97 | &null_factory_create_stream, |
| 98 | &null_factory_refresh |
| 99 | }; |
| 100 | |
| 101 | static pjmedia_aud_stream_op stream_op = |
| 102 | { |
| 103 | &null_stream_get_param, |
| 104 | &null_stream_get_cap, |
| 105 | &null_stream_set_cap, |
| 106 | &null_stream_start, |
| 107 | &null_stream_stop, |
| 108 | &null_stream_destroy |
| 109 | }; |
| 110 | |
| 111 | |
| 112 | /**************************************************************************** |
| 113 | * Factory operations |
| 114 | */ |
| 115 | /* |
| 116 | * Init null_audio audio driver. |
| 117 | */ |
| 118 | pjmedia_aud_dev_factory* pjmedia_null_audio_factory(pj_pool_factory *pf) |
| 119 | { |
| 120 | struct null_audio_factory *f; |
| 121 | pj_pool_t *pool; |
| 122 | |
| 123 | pool = pj_pool_create(pf, "null audio", 1000, 1000, NULL); |
| 124 | f = PJ_POOL_ZALLOC_T(pool, struct null_audio_factory); |
| 125 | f->pf = pf; |
| 126 | f->pool = pool; |
| 127 | f->base.op = &factory_op; |
| 128 | |
| 129 | return &f->base; |
| 130 | } |
| 131 | |
| 132 | |
| 133 | /* API: init factory */ |
| 134 | static pj_status_t null_factory_init(pjmedia_aud_dev_factory *f) |
| 135 | { |
| 136 | struct null_audio_factory *nf = (struct null_audio_factory*)f; |
| 137 | struct null_audio_dev_info *ndi; |
| 138 | |
| 139 | /* Initialize input and output devices here */ |
| 140 | nf->dev_count = 1; |
| 141 | nf->dev_info = (struct null_audio_dev_info*) |
| 142 | pj_pool_calloc(nf->pool, nf->dev_count, |
| 143 | sizeof(struct null_audio_dev_info)); |
| 144 | ndi = &nf->dev_info[0]; |
| 145 | pj_bzero(ndi, sizeof(*ndi)); |
| 146 | strcpy(ndi->info.name, "null device"); |
| 147 | strcpy(ndi->info.driver, "null"); |
| 148 | ndi->info.input_count = 1; |
| 149 | ndi->info.output_count = 1; |
| 150 | ndi->info.default_samples_per_sec = 16000; |
| 151 | /* Set the device capabilities here */ |
| 152 | ndi->info.caps = 0; |
| 153 | |
| 154 | PJ_LOG(4, (THIS_FILE, "null audio initialized")); |
| 155 | |
| 156 | return PJ_SUCCESS; |
| 157 | } |
| 158 | |
| 159 | /* API: destroy factory */ |
| 160 | static pj_status_t null_factory_destroy(pjmedia_aud_dev_factory *f) |
| 161 | { |
| 162 | struct null_audio_factory *nf = (struct null_audio_factory*)f; |
| 163 | pj_pool_t *pool = nf->pool; |
| 164 | |
| 165 | nf->pool = NULL; |
| 166 | pj_pool_release(pool); |
| 167 | |
| 168 | return PJ_SUCCESS; |
| 169 | } |
| 170 | |
| 171 | /* API: refresh the list of devices */ |
| 172 | static pj_status_t null_factory_refresh(pjmedia_aud_dev_factory *f) |
| 173 | { |
| 174 | PJ_UNUSED_ARG(f); |
| 175 | return PJ_SUCCESS; |
| 176 | } |
| 177 | |
| 178 | /* API: get number of devices */ |
| 179 | static unsigned null_factory_get_dev_count(pjmedia_aud_dev_factory *f) |
| 180 | { |
| 181 | struct null_audio_factory *nf = (struct null_audio_factory*)f; |
| 182 | return nf->dev_count; |
| 183 | } |
| 184 | |
| 185 | /* API: get device info */ |
| 186 | static pj_status_t null_factory_get_dev_info(pjmedia_aud_dev_factory *f, |
| 187 | unsigned index, |
| 188 | pjmedia_aud_dev_info *info) |
| 189 | { |
| 190 | struct null_audio_factory *nf = (struct null_audio_factory*)f; |
| 191 | |
| 192 | PJ_ASSERT_RETURN(index < nf->dev_count, PJMEDIA_EAUD_INVDEV); |
| 193 | |
| 194 | pj_memcpy(info, &nf->dev_info[index].info, sizeof(*info)); |
| 195 | |
| 196 | return PJ_SUCCESS; |
| 197 | } |
| 198 | |
| 199 | /* API: create default device parameter */ |
| 200 | static pj_status_t null_factory_default_param(pjmedia_aud_dev_factory *f, |
| 201 | unsigned index, |
| 202 | pjmedia_aud_param *param) |
| 203 | { |
| 204 | struct null_audio_factory *nf = (struct null_audio_factory*)f; |
| 205 | struct null_audio_dev_info *di = &nf->dev_info[index]; |
| 206 | |
| 207 | PJ_ASSERT_RETURN(index < nf->dev_count, PJMEDIA_EAUD_INVDEV); |
| 208 | |
| 209 | pj_bzero(param, sizeof(*param)); |
| 210 | if (di->info.input_count && di->info.output_count) { |
| 211 | param->dir = PJMEDIA_DIR_CAPTURE_PLAYBACK; |
| 212 | param->rec_id = index; |
| 213 | param->play_id = index; |
| 214 | } else if (di->info.input_count) { |
| 215 | param->dir = PJMEDIA_DIR_CAPTURE; |
| 216 | param->rec_id = index; |
| 217 | param->play_id = PJMEDIA_AUD_INVALID_DEV; |
| 218 | } else if (di->info.output_count) { |
| 219 | param->dir = PJMEDIA_DIR_PLAYBACK; |
| 220 | param->play_id = index; |
| 221 | param->rec_id = PJMEDIA_AUD_INVALID_DEV; |
| 222 | } else { |
| 223 | return PJMEDIA_EAUD_INVDEV; |
| 224 | } |
| 225 | |
| 226 | /* Set the mandatory settings here */ |
| 227 | /* The values here are just some examples */ |
| 228 | param->clock_rate = di->info.default_samples_per_sec; |
| 229 | param->channel_count = 1; |
| 230 | param->samples_per_frame = di->info.default_samples_per_sec * 20 / 1000; |
| 231 | param->bits_per_sample = 16; |
| 232 | |
| 233 | /* Set the device capabilities here */ |
| 234 | param->flags = 0; |
| 235 | |
| 236 | return PJ_SUCCESS; |
| 237 | } |
| 238 | |
| 239 | /* API: create stream */ |
| 240 | static pj_status_t null_factory_create_stream(pjmedia_aud_dev_factory *f, |
| 241 | const pjmedia_aud_param *param, |
| 242 | pjmedia_aud_rec_cb rec_cb, |
| 243 | pjmedia_aud_play_cb play_cb, |
| 244 | void *user_data, |
| 245 | pjmedia_aud_stream **p_aud_strm) |
| 246 | { |
| 247 | struct null_audio_factory *nf = (struct null_audio_factory*)f; |
| 248 | pj_pool_t *pool; |
| 249 | struct null_audio_stream *strm; |
| 250 | |
| 251 | /* Create and Initialize stream descriptor */ |
| 252 | pool = pj_pool_create(nf->pf, "null_audio-dev", 1000, 1000, NULL); |
| 253 | PJ_ASSERT_RETURN(pool != NULL, PJ_ENOMEM); |
| 254 | |
| 255 | strm = PJ_POOL_ZALLOC_T(pool, struct null_audio_stream); |
| 256 | pj_memcpy(&strm->param, param, sizeof(*param)); |
| 257 | strm->pool = pool; |
| 258 | strm->rec_cb = rec_cb; |
| 259 | strm->play_cb = play_cb; |
| 260 | strm->user_data = user_data; |
| 261 | |
| 262 | /* Create player stream here */ |
| 263 | if (param->dir & PJMEDIA_DIR_PLAYBACK) { |
| 264 | } |
| 265 | |
| 266 | /* Create capture stream here */ |
| 267 | if (param->dir & PJMEDIA_DIR_CAPTURE) { |
| 268 | } |
| 269 | |
| 270 | /* Apply the remaining settings */ |
| 271 | /* Below is an example if you want to set the output volume */ |
| 272 | if (param->flags & PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING) { |
| 273 | null_stream_set_cap(&strm->base, |
| 274 | PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING, |
| 275 | ¶m->output_vol); |
| 276 | } |
| 277 | |
| 278 | /* Done */ |
| 279 | strm->base.op = &stream_op; |
| 280 | *p_aud_strm = &strm->base; |
| 281 | |
| 282 | return PJ_SUCCESS; |
| 283 | } |
| 284 | |
| 285 | /* API: Get stream info. */ |
| 286 | static pj_status_t null_stream_get_param(pjmedia_aud_stream *s, |
| 287 | pjmedia_aud_param *pi) |
| 288 | { |
| 289 | struct null_audio_stream *strm = (struct null_audio_stream*)s; |
| 290 | |
| 291 | PJ_ASSERT_RETURN(strm && pi, PJ_EINVAL); |
| 292 | |
| 293 | pj_memcpy(pi, &strm->param, sizeof(*pi)); |
| 294 | |
| 295 | /* Example: Update the volume setting */ |
| 296 | if (null_stream_get_cap(s, PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING, |
| 297 | &pi->output_vol) == PJ_SUCCESS) |
| 298 | { |
| 299 | pi->flags |= PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING; |
| 300 | } |
| 301 | |
| 302 | return PJ_SUCCESS; |
| 303 | } |
| 304 | |
| 305 | /* API: get capability */ |
| 306 | static pj_status_t null_stream_get_cap(pjmedia_aud_stream *s, |
| 307 | pjmedia_aud_dev_cap cap, |
| 308 | void *pval) |
| 309 | { |
| 310 | struct null_audio_stream *strm = (struct null_audio_stream*)s; |
| 311 | |
| 312 | PJ_UNUSED_ARG(strm); |
| 313 | |
| 314 | PJ_ASSERT_RETURN(s && pval, PJ_EINVAL); |
| 315 | |
| 316 | /* Example: Get the output's volume setting */ |
| 317 | if (cap==PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING) |
| 318 | { |
| 319 | /* Output volume setting */ |
| 320 | *(unsigned*)pval = 0; // retrieve output device's volume here |
| 321 | return PJ_SUCCESS; |
| 322 | } else { |
| 323 | return PJMEDIA_EAUD_INVCAP; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | /* API: set capability */ |
| 328 | static pj_status_t null_stream_set_cap(pjmedia_aud_stream *s, |
| 329 | pjmedia_aud_dev_cap cap, |
| 330 | const void *pval) |
| 331 | { |
| 332 | struct null_audio_stream *strm = (struct null_audio_stream*)s; |
| 333 | |
| 334 | PJ_UNUSED_ARG(strm); |
| 335 | |
| 336 | PJ_ASSERT_RETURN(s && pval, PJ_EINVAL); |
| 337 | |
| 338 | /* Example */ |
| 339 | if (cap==PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING) |
| 340 | { |
| 341 | /* Output volume setting */ |
| 342 | // set output's volume level here |
| 343 | return PJ_SUCCESS; |
| 344 | } |
| 345 | |
| 346 | return PJMEDIA_EAUD_INVCAP; |
| 347 | } |
| 348 | |
| 349 | /* API: Start stream. */ |
| 350 | static pj_status_t null_stream_start(pjmedia_aud_stream *strm) |
| 351 | { |
| 352 | struct null_audio_stream *stream = (struct null_audio_stream*)strm; |
| 353 | |
| 354 | PJ_UNUSED_ARG(stream); |
| 355 | |
| 356 | PJ_LOG(4, (THIS_FILE, "Starting null audio stream")); |
| 357 | |
| 358 | return PJ_SUCCESS; |
| 359 | } |
| 360 | |
| 361 | /* API: Stop stream. */ |
| 362 | static pj_status_t null_stream_stop(pjmedia_aud_stream *strm) |
| 363 | { |
| 364 | struct null_audio_stream *stream = (struct null_audio_stream*)strm; |
| 365 | |
| 366 | PJ_UNUSED_ARG(stream); |
| 367 | |
| 368 | PJ_LOG(4, (THIS_FILE, "Stopping null audio stream")); |
| 369 | |
| 370 | return PJ_SUCCESS; |
| 371 | } |
| 372 | |
| 373 | |
| 374 | /* API: Destroy stream. */ |
| 375 | static pj_status_t null_stream_destroy(pjmedia_aud_stream *strm) |
| 376 | { |
| 377 | struct null_audio_stream *stream = (struct null_audio_stream*)strm; |
| 378 | |
| 379 | PJ_ASSERT_RETURN(stream != NULL, PJ_EINVAL); |
| 380 | |
| 381 | null_stream_stop(strm); |
| 382 | |
| 383 | pj_pool_release(stream->pool); |
| 384 | |
| 385 | return PJ_SUCCESS; |
| 386 | } |
| 387 | |
| 388 | #endif /* PJMEDIA_AUDIO_DEV_HAS_NULL_AUDIO */ |