main/audiohook.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2007, Digium, Inc.
   5  *
   6  * Joshua Colp <jcolp@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Audiohooks Architecture
  22  *
  23  * \author Joshua Colp <jcolp@digium.com>
  24  */
  25
  26 #include "asterisk.h"
  27
  28 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <signal.h>
  34 #include <errno.h>
  35 #include <unistd.h>
  36
  37 #include "asterisk/logger.h"
  38 #include "asterisk/channel.h"
  39 #include "asterisk/options.h"
  40 #include "asterisk/utils.h"
  41 #include "asterisk/lock.h"
  42 #include "asterisk/linkedlists.h"
  43 #include "asterisk/audiohook.h"
  44 #include "asterisk/slinfactory.h"
  45 #include "asterisk/frame.h"
  46 #include "asterisk/translate.h"
  47
  48 struct ast_audiohook_translate {
  49         struct ast_trans_pvt *trans_pvt;
  50         int format;
  51 };
  52
  53 struct ast_audiohook_list {
  54         struct ast_audiohook_translate in_translate[2];
  55         struct ast_audiohook_translate out_translate[2];
  56         AST_LIST_HEAD_NOLOCK(, ast_audiohook) spy_list;
  57         AST_LIST_HEAD_NOLOCK(, ast_audiohook) whisper_list;
  58         AST_LIST_HEAD_NOLOCK(, ast_audiohook) manipulate_list;
  59 };
  60
  61 /*! \brief Initialize an audiohook structure
  62  * \param audiohook Audiohook structure
  63  * \param type
  64  * \param source
  65  * \return Returns 0 on success, -1 on failure
  66  */
  67 int ast_audiohook_init(struct ast_audiohook *audiohook, enum ast_audiohook_type type, const char *source)
  68 {
  69         /* Need to keep the type and source */
  70         audiohook->type = type;
  71         audiohook->source = source;
  72
  73         /* Initialize lock that protects our audiohook */
  74         ast_mutex_init(&audiohook->lock);
  75         ast_cond_init(&audiohook->trigger, NULL);
  76
  77         /* Setup the factories that are needed for this audiohook type */
  78         switch (type) {
  79         case AST_AUDIOHOOK_TYPE_SPY:
  80                 ast_slinfactory_init(&audiohook->read_factory);
  81         case AST_AUDIOHOOK_TYPE_WHISPER:
  82                 ast_slinfactory_init(&audiohook->write_factory);
  83                 break;
  84         default:
  85                 break;
  86         }
  87
  88         /* Since we are just starting out... this audiohook is new */
  89         audiohook->status = AST_AUDIOHOOK_STATUS_NEW;
  90
  91         return 0;
  92 }
  93
  94 /*! \brief Destroys an audiohook structure
  95  * \param audiohook Audiohook structure
  96  * \return Returns 0 on success, -1 on failure
  97  */
  98 int ast_audiohook_destroy(struct ast_audiohook *audiohook)
  99 {
 100         /* Drop the factories used by this audiohook type */
 101         switch (audiohook->type) {
 102         case AST_AUDIOHOOK_TYPE_SPY:
 103                 ast_slinfactory_destroy(&audiohook->read_factory);
 104         case AST_AUDIOHOOK_TYPE_WHISPER:
 105                 ast_slinfactory_destroy(&audiohook->write_factory);
 106                 break;
 107         default:
 108                 break;
 109         }
 110
 111         /* Destroy translation path if present */
 112         if (audiohook->trans_pvt)
 113                 ast_translator_free_path(audiohook->trans_pvt);
 114
 115         /* Lock and trigger be gone! */
 116         ast_cond_destroy(&audiohook->trigger);
 117         ast_mutex_destroy(&audiohook->lock);
 118
 119         return 0;
 120 }
 121
 122 /*! \brief Writes a frame into the audiohook structure
 123  * \param audiohook Audiohook structure
 124  * \param direction Direction the audio frame came from
 125  * \param frame Frame to write in
 126  * \return Returns 0 on success, -1 on failure
 127  */
 128 int ast_audiohook_write_frame(struct ast_audiohook *audiohook, enum ast_audiohook_direction direction, struct ast_frame *frame)
 129 {
 130         struct ast_slinfactory *factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_factory : &audiohook->write_factory);
 131
 132         /* Write frame out to respective factory */
 133         ast_slinfactory_feed(factory, frame);
 134
 135         /* If we need to notify the respective handler of this audiohook, do so */
 136         switch (ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_MODE)) {
 137         case AST_AUDIOHOOK_TRIGGER_READ:
 138                 if (direction == AST_AUDIOHOOK_DIRECTION_READ)
 139                         ast_cond_signal(&audiohook->trigger);
 140                 break;
 141         case AST_AUDIOHOOK_TRIGGER_WRITE:
 142                 if (direction == AST_AUDIOHOOK_DIRECTION_WRITE)
 143                         ast_cond_signal(&audiohook->trigger);
 144                 break;
 145         default:
 146                 break;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static struct ast_frame *audiohook_read_frame_single(struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction)
 153 {
 154         struct ast_slinfactory *factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_factory : &audiohook->write_factory);
 155         int vol = (direction == AST_AUDIOHOOK_DIRECTION_READ ? audiohook->options.read_volume : audiohook->options.write_volume);
 156         short buf[samples];
 157         struct ast_frame frame = {
 158                 .frametype = AST_FRAME_VOICE,
 159                 .subclass = AST_FORMAT_SLINEAR,
 160                 .data = buf,
 161                 .datalen = sizeof(buf),
 162                 .samples = samples,
 163         };
 164
 165         /* Ensure the factory is able to give us the samples we want */
 166         if (samples > ast_slinfactory_available(factory))
 167                 return NULL;
 168
 169         /* Read data in from factory */
 170         if (!ast_slinfactory_read(factory, buf, samples))
 171                 return NULL;
 172
 173         /* If a volume adjustment needs to be applied apply it */
 174         if (vol)
 175                 ast_frame_adjust_volume(&frame, vol);
 176
 177         return ast_frdup(&frame);
 178 }
 179
 180 static struct ast_frame *audiohook_read_frame_both(struct ast_audiohook *audiohook, size_t samples)
 181 {
 182         int i = 0;
 183         short buf1[samples], buf2[samples], *read_buf = NULL, *write_buf = NULL, *final_buf = NULL, *data1 = NULL, *data2 = NULL;
 184         struct ast_frame frame = {
 185                 .frametype = AST_FRAME_VOICE,
 186                 .subclass = AST_FORMAT_SLINEAR,
 187                 .data = NULL,
 188                 .datalen = sizeof(buf1),
 189                 .samples = samples,
 190         };
 191
 192         /* Start with the read factory... if there are enough samples, read them in */
 193         if (ast_slinfactory_available(&audiohook->read_factory) >= samples) {
 194                 if (ast_slinfactory_read(&audiohook->read_factory, buf1, samples)) {
 195                         read_buf = buf1;
 196                         /* Adjust read volume if need be */
 197                         if (audiohook->options.read_volume) {
 198                                 int count = 0;
 199                                 short adjust_value = abs(audiohook->options.read_volume);
 200                                 for (count = 0; count < samples; count++) {
 201                                         if (audiohook->options.read_volume > 0)
 202                                                 ast_slinear_saturated_multiply(&buf1[count], &adjust_value);
 203                                         else if (audiohook->options.read_volume < 0)
 204                                                 ast_slinear_saturated_divide(&buf1[count], &adjust_value);
 205                                 }
 206                         }
 207                 }
 208         } else if (option_debug)
 209                 ast_log(LOG_DEBUG, "Failed to get %zd samples from read factory %p\n", samples, &audiohook->read_factory);
 210
 211         /* Move on to the write factory... if there are enough samples, read them in */
 212         if (ast_slinfactory_available(&audiohook->write_factory) >= samples) {
 213                 if (ast_slinfactory_read(&audiohook->write_factory, buf2, samples)) {
 214                         write_buf = buf2;
 215                         /* Adjust write volume if need be */
 216                         if (audiohook->options.write_volume) {
 217                                 int count = 0;
 218                                 short adjust_value = abs(audiohook->options.write_volume);
 219                                 for (count = 0; count < samples; count++) {
 220                                         if (audiohook->options.write_volume > 0)
 221                                                 ast_slinear_saturated_multiply(&buf2[count], &adjust_value);
 222                                         else if (audiohook->options.write_volume < 0)
 223                                                 ast_slinear_saturated_divide(&buf2[count], &adjust_value);
 224                                 }
 225                         }
 226                 }
 227         } else if (option_debug)
 228                 ast_log(LOG_DEBUG, "Failed to get %zd samples from write factory %p\n", samples, &audiohook->write_factory);
 229
 230         /* Basically we figure out which buffer to use... and if mixing can be done here */
 231         if (!read_buf && !write_buf)
 232                 return NULL;
 233         else if (read_buf && write_buf) {
 234                 for (i = 0, data1 = read_buf, data2 = write_buf; i < samples; i++, data1++, data2++)
 235                         ast_slinear_saturated_add(data1, data2);
 236                 final_buf = buf1;
 237         } else if (read_buf)
 238                 final_buf = buf1;
 239         else if (write_buf)
 240                 final_buf = buf2;
 241
 242         /* Make the final buffer part of the frame, so it gets duplicated fine */
 243         frame.data = final_buf;
 244
 245         /* Yahoo, a combined copy of the audio! */
 246         return ast_frdup(&frame);
 247 }
 248
 249 /*! \brief Reads a frame in from the audiohook structure
 250  * \param audiohook Audiohook structure
 251  * \param samples Number of samples wanted
 252  * \param direction Direction the audio frame came from
 253  * \param format Format of frame remote side wants back
 254  * \return Returns frame on success, NULL on failure
 255  */
 256 struct ast_frame *ast_audiohook_read_frame(struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction, int format)
 257 {
 258         struct ast_frame *read_frame = NULL, *final_frame = NULL;
 259
 260         if (!(read_frame = (direction == AST_AUDIOHOOK_DIRECTION_BOTH ? audiohook_read_frame_both(audiohook, samples) : audiohook_read_frame_single(audiohook, samples, direction))))
 261                 return NULL;
 262
 263         /* If they don't want signed linear back out, we'll have to send it through the translation path */
 264         if (format != AST_FORMAT_SLINEAR) {
 265                 /* Rebuild translation path if different format then previously */
 266                 if (audiohook->format != format) {
 267                         if (audiohook->trans_pvt) {
 268                                 ast_translator_free_path(audiohook->trans_pvt);
 269                                 audiohook->trans_pvt = NULL;
 270                         }
 271                         /* Setup new translation path for this format... if we fail we can't very well return signed linear so free the frame and return nothing */
 272                         if (!(audiohook->trans_pvt = ast_translator_build_path(format, AST_FORMAT_SLINEAR))) {
 273                                 ast_frfree(read_frame);
 274                                 return NULL;
 275                         }
 276                 }
 277                 /* Convert to requested format, and allow the read in frame to be freed */
 278                 final_frame = ast_translate(audiohook->trans_pvt, read_frame, 1);
 279         } else {
 280                 final_frame = read_frame;
 281         }
 282
 283         return final_frame;
 284 }
 285
 286 /*! \brief Attach audiohook to channel
 287  * \param chan Channel
 288  * \param audiohook Audiohook structure
 289  * \return Returns 0 on success, -1 on failure
 290  */
 291 int ast_audiohook_attach(struct ast_channel *chan, struct ast_audiohook *audiohook)
 292 {
 293         ast_channel_lock(chan);
 294
 295         if (!chan->audiohooks) {
 296                 /* Whoops... allocate a new structure */
 297                 if (!(chan->audiohooks = ast_calloc(1, sizeof(*chan->audiohooks)))) {
 298                         ast_channel_unlock(chan);
 299                         return -1;
 300                 }
 301                 AST_LIST_HEAD_INIT_NOLOCK(&chan->audiohooks->spy_list);
 302                 AST_LIST_HEAD_INIT_NOLOCK(&chan->audiohooks->whisper_list);
 303                 AST_LIST_HEAD_INIT_NOLOCK(&chan->audiohooks->manipulate_list);
 304         }
 305
 306         /* Drop into respective list */
 307         if (audiohook->type == AST_AUDIOHOOK_TYPE_SPY)
 308                 AST_LIST_INSERT_TAIL(&chan->audiohooks->spy_list, audiohook, list);
 309         else if (audiohook->type == AST_AUDIOHOOK_TYPE_WHISPER)
 310                 AST_LIST_INSERT_TAIL(&chan->audiohooks->whisper_list, audiohook, list);
 311         else if (audiohook->type == AST_AUDIOHOOK_TYPE_MANIPULATE)
 312                 AST_LIST_INSERT_TAIL(&chan->audiohooks->manipulate_list, audiohook, list);
 313
 314         /* Change status over to running since it is now attached */
 315         audiohook->status = AST_AUDIOHOOK_STATUS_RUNNING;
 316
 317         ast_channel_unlock(chan);
 318
 319         return 0;
 320 }
 321
 322 /*! \brief Detach audiohook from channel
 323  * \param audiohook Audiohook structure
 324  * \return Returns 0 on success, -1 on failure
 325  */
 326 int ast_audiohook_detach(struct ast_audiohook *audiohook)
 327 {
 328         if (audiohook->status == AST_AUDIOHOOK_STATUS_DONE)
 329                 return 0;
 330
 331         audiohook->status = AST_AUDIOHOOK_STATUS_SHUTDOWN;
 332
 333         while (audiohook->status != AST_AUDIOHOOK_STATUS_DONE)
 334                 ast_audiohook_trigger_wait(audiohook);
 335
 336         return 0;
 337 }
 338
 339 /*! \brief Detach audiohooks from list and destroy said list
 340  * \param audiohook_list List of audiohooks
 341  * \return Returns 0 on success, -1 on failure
 342  */
 343 int ast_audiohook_detach_list(struct ast_audiohook_list *audiohook_list)
 344 {
 345         int i = 0;
 346         struct ast_audiohook *audiohook = NULL;
 347
 348         /* Drop any spies */
 349         AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->spy_list, audiohook, list) {
 350                 ast_audiohook_lock(audiohook);
 351                 AST_LIST_REMOVE_CURRENT(&audiohook_list->spy_list, list);
 352                 audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 353                 ast_cond_signal(&audiohook->trigger);
 354                 ast_audiohook_unlock(audiohook);
 355         }
 356         AST_LIST_TRAVERSE_SAFE_END
 357
 358         /* Drop any whispering sources */
 359         AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->whisper_list, audiohook, list) {
 360                 ast_audiohook_lock(audiohook);
 361                 AST_LIST_REMOVE_CURRENT(&audiohook_list->whisper_list, list);
 362                 audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 363                 ast_cond_signal(&audiohook->trigger);
 364                 ast_audiohook_unlock(audiohook);
 365         }
 366         AST_LIST_TRAVERSE_SAFE_END
 367
 368         /* Drop any manipulaters */
 369         AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->manipulate_list, audiohook, list) {
 370                 ast_audiohook_lock(audiohook);
 371                 AST_LIST_REMOVE_CURRENT(&audiohook_list->manipulate_list, list);
 372                 audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 373                 ast_audiohook_unlock(audiohook);
 374                 audiohook->manipulate_callback(audiohook, NULL, NULL, 0);
 375         }
 376         AST_LIST_TRAVERSE_SAFE_END
 377
 378         /* Drop translation paths if present */
 379         for (i = 0; i < 2; i++) {
 380                 if (audiohook_list->in_translate[i].trans_pvt)
 381                         ast_translator_free_path(audiohook_list->in_translate[i].trans_pvt);
 382                 if (audiohook_list->out_translate[i].trans_pvt)
 383                         ast_translator_free_path(audiohook_list->out_translate[i].trans_pvt);
 384         }
 385
 386         /* Free ourselves */
 387         ast_free(audiohook_list);
 388
 389         return 0;
 390 }
 391
 392 static struct ast_audiohook *find_audiohook_by_source(struct ast_audiohook_list *audiohook_list, const char *source)
 393 {
 394         struct ast_audiohook *audiohook = NULL;
 395
 396         AST_LIST_TRAVERSE(&audiohook_list->spy_list, audiohook, list) {
 397                 if (!strcasecmp(audiohook->source, source))
 398                         return audiohook;
 399         }
 400
 401         AST_LIST_TRAVERSE(&audiohook_list->whisper_list, audiohook, list) {
 402                 if (!strcasecmp(audiohook->source, source))
 403                         return audiohook;
 404         }
 405
 406         AST_LIST_TRAVERSE(&audiohook_list->manipulate_list, audiohook, list) {
 407                 if (!strcasecmp(audiohook->source, source))
 408                         return audiohook;
 409         }
 410
 411         return NULL;
 412 }
 413
 414 /*! \brief Detach specified source audiohook from channel
 415  * \param chan Channel to detach from
 416  * \param source Name of source to detach
 417  * \return Returns 0 on success, -1 on failure
 418  */
 419 int ast_audiohook_detach_source(struct ast_channel *chan, const char *source)
 420 {
 421         struct ast_audiohook *audiohook = NULL;
 422
 423         ast_channel_lock(chan);
 424
 425         /* Ensure the channel has audiohooks on it */
 426         if (!chan->audiohooks) {
 427                 ast_channel_unlock(chan);
 428                 return -1;
 429         }
 430
 431         audiohook = find_audiohook_by_source(chan->audiohooks, source);
 432
 433         ast_channel_unlock(chan);
 434
 435         if (audiohook && audiohook->status != AST_AUDIOHOOK_STATUS_DONE)
 436                 audiohook->status = AST_AUDIOHOOK_STATUS_SHUTDOWN;
 437
 438         return (audiohook ? 0 : -1);
 439 }
 440
 441 /*! \brief Pass a DTMF frame off to be handled by the audiohook core
 442  * \param chan Channel that the list is coming off of
 443  * \param audiohook_list List of audiohooks
 444  * \param direction Direction frame is coming in from
 445  * \param frame The frame itself
 446  * \return Return frame on success, NULL on failure
 447  */
 448 static struct ast_frame *dtmf_audiohook_write_list(struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame)
 449 {
 450         struct ast_audiohook *audiohook = NULL;
 451
 452         AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->manipulate_list, audiohook, list) {
 453                 ast_audiohook_lock(audiohook);
 454                 if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
 455                         AST_LIST_REMOVE_CURRENT(&audiohook_list->manipulate_list, list);
 456                         audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 457                         ast_audiohook_unlock(audiohook);
 458                         audiohook->manipulate_callback(audiohook, NULL, NULL, 0);
 459                         continue;
 460                 }
 461                 if (ast_test_flag(audiohook, AST_AUDIOHOOK_WANTS_DTMF))
 462                         audiohook->manipulate_callback(audiohook, chan, frame, direction);
 463                 ast_audiohook_unlock(audiohook);
 464         }
 465         AST_LIST_TRAVERSE_SAFE_END
 466
 467         return frame;
 468 }
 469
 470 /*! \brief Pass an AUDIO frame off to be handled by the audiohook core
 471  * \param chan Channel that the list is coming off of
 472  * \param audiohook_list List of audiohooks
 473  * \param direction Direction frame is coming in from
 474  * \param frame The frame itself
 475  * \return Return frame on success, NULL on failure
 476  */
 477 static struct ast_frame *audio_audiohook_write_list(struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame)
 478 {
 479         struct ast_audiohook_translate *in_translate = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook_list->in_translate[0] : &audiohook_list->in_translate[1]);
 480         struct ast_audiohook_translate *out_translate = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook_list->out_translate[0] : &audiohook_list->out_translate[1]);
 481         struct ast_frame *start_frame = frame, *middle_frame = frame, *end_frame = frame;
 482         struct ast_audiohook *audiohook = NULL;
 483         int samples = frame->samples;
 484
 485         /* If the frame coming in is not signed linear we have to send it through the in_translate path */
 486         if (frame->subclass != AST_FORMAT_SLINEAR) {
 487                 if (in_translate->format != frame->subclass) {
 488                         if (in_translate->trans_pvt)
 489                                 ast_translator_free_path(in_translate->trans_pvt);
 490                         if (!(in_translate->trans_pvt = ast_translator_build_path(AST_FORMAT_SLINEAR, frame->subclass)))
 491                                 return frame;
 492                         in_translate->format = frame->subclass;
 493                 }
 494                 if (!(middle_frame = ast_translate(in_translate->trans_pvt, frame, 0)))
 495                         return frame;
 496         }
 497
 498         /* Queue up signed linear frame to each spy */
 499         AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->spy_list, audiohook, list) {
 500                 ast_audiohook_lock(audiohook);
 501                 if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
 502                         AST_LIST_REMOVE_CURRENT(&audiohook_list->spy_list, list);
 503                         audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 504                         ast_cond_signal(&audiohook->trigger);
 505                         ast_audiohook_unlock(audiohook);
 506                         continue;
 507                 }
 508                 ast_audiohook_write_frame(audiohook, direction, middle_frame);
 509                 ast_audiohook_unlock(audiohook);
 510         }
 511         AST_LIST_TRAVERSE_SAFE_END
 512
 513         /* If this frame is being written out to the channel then we need to use whisper sources */
 514         if (direction == AST_AUDIOHOOK_DIRECTION_WRITE && !AST_LIST_EMPTY(&audiohook_list->whisper_list)) {
 515                 int i = 0;
 516                 short read_buf[samples], combine_buf[samples], *data1 = NULL, *data2 = NULL;
 517                 memset(&combine_buf, 0, sizeof(combine_buf));
 518                 AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->whisper_list, audiohook, list) {
 519                         ast_audiohook_lock(audiohook);
 520                         if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
 521                                 AST_LIST_REMOVE_CURRENT(&audiohook_list->whisper_list, list);
 522                                 audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 523                                 ast_cond_signal(&audiohook->trigger);
 524                                 ast_audiohook_unlock(audiohook);
 525                                 continue;
 526                         }
 527                         if (ast_slinfactory_available(&audiohook->write_factory) >= samples && ast_slinfactory_read(&audiohook->write_factory, read_buf, samples)) {
 528                                 /* Take audio from this whisper source and combine it into our main buffer */
 529                                 for (i = 0, data1 = combine_buf, data2 = read_buf; i < samples; i++, data1++, data2++)
 530                                         ast_slinear_saturated_add(data1, data2);
 531                         }
 532                         ast_audiohook_unlock(audiohook);
 533                 }
 534                 AST_LIST_TRAVERSE_SAFE_END
 535                 /* We take all of the combined whisper sources and combine them into the audio being written out */
 536                 for (i = 0, data1 = middle_frame->data, data2 = combine_buf; i < samples; i++, data1++, data2++)
 537                         ast_slinear_saturated_add(data1, data2);
 538                 end_frame = middle_frame;
 539         }
 540
 541         /* Pass off frame to manipulate audiohooks */
 542         if (!AST_LIST_EMPTY(&audiohook_list->manipulate_list)) {
 543                 AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->manipulate_list, audiohook, list) {
 544                         ast_audiohook_lock(audiohook);
 545                         if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
 546                                 AST_LIST_REMOVE_CURRENT(&audiohook_list->manipulate_list, list);
 547                                 audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
 548                                 ast_audiohook_unlock(audiohook);
 549                                 /* We basically drop all of our links to the manipulate audiohook and prod it to do it's own destructive things */
 550                                 audiohook->manipulate_callback(audiohook, chan, NULL, direction);
 551                                 continue;
 552                         }
 553                         /* Feed in frame to manipulation */
 554                         audiohook->manipulate_callback(audiohook, chan, middle_frame, direction);
 555                         ast_audiohook_unlock(audiohook);
 556                 }
 557                 AST_LIST_TRAVERSE_SAFE_END
 558                 end_frame = middle_frame;
 559         }
 560
 561         /* Now we figure out what to do with our end frame (whether to transcode or not) */
 562         if (middle_frame == end_frame) {
 563                 /* Middle frame was modified and became the end frame... let's see if we need to transcode */
 564                 if (end_frame->subclass != start_frame->subclass) {
 565                         if (out_translate->format != start_frame->subclass) {
 566                                 if (out_translate->trans_pvt)
 567                                         ast_translator_free_path(out_translate->trans_pvt);
 568                                 if (!(out_translate->trans_pvt = ast_translator_build_path(start_frame->subclass, AST_FORMAT_SLINEAR))) {
 569                                         /* We can't transcode this... drop our middle frame and return the original */
 570                                         ast_frfree(middle_frame);
 571                                         return start_frame;
 572                                 }
 573                                 out_translate->format = start_frame->subclass;
 574                         }
 575                         /* Transcode from our middle (signed linear) frame to new format of the frame that came in */
 576                         if (!(end_frame = ast_translate(out_translate->trans_pvt, middle_frame, 0))) {
 577                                 /* Failed to transcode the frame... drop it and return the original */
 578                                 ast_frfree(middle_frame);
 579                                 return start_frame;
 580                         }
 581                         /* Here's the scoop... middle frame is no longer of use to us */
 582                         ast_frfree(middle_frame);
 583                 }
 584         } else {
 585                 /* No frame was modified, we can just drop our middle frame and pass the frame we got in out */
 586                 ast_frfree(middle_frame);
 587         }
 588
 589         return end_frame;
 590 }
 591
 592 /*! \brief Pass a frame off to be handled by the audiohook core
 593  * \param chan Channel that the list is coming off of
 594  * \param audiohook_list List of audiohooks
 595  * \param direction Direction frame is coming in from
 596  * \param frame The frame itself
 597  * \return Return frame on success, NULL on failure
 598  */
 599 struct ast_frame *ast_audiohook_write_list(struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame)
 600 {
 601         /* Pass off frame to it's respective list write function */
 602         if (frame->frametype == AST_FRAME_VOICE)
 603                 return audio_audiohook_write_list(chan, audiohook_list, direction, frame);
 604         else if (frame->frametype == AST_FRAME_DTMF)
 605                 return dtmf_audiohook_write_list(chan, audiohook_list, direction, frame);
 606         else
 607                 return frame;
 608 }
 609
 610
 611 /*! \brief Wait for audiohook trigger to be triggered
 612  * \param audiohook Audiohook to wait on
 613  */
 614 void ast_audiohook_trigger_wait(struct ast_audiohook *audiohook)
 615 {
 616         struct timeval tv;
 617         struct timespec ts;
 618
 619         tv = ast_tvadd(ast_tvnow(), ast_samp2tv(50000, 1000));
 620         ts.tv_sec = tv.tv_sec;
 621         ts.tv_nsec = tv.tv_usec * 1000;
 622
 623         ast_cond_timedwait(&audiohook->trigger, &audiohook->lock, &ts);
 624
 625         return;
 626 }