channels/chan_alsa.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * By Matthew Fredrickson <creslin@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  * \brief ALSA sound card channel driver
  21  *
  22  * \author Matthew Fredrickson <creslin@digium.com>
  23  *
  24  * \par See also
  25  * \arg Config_alsa
  26  *
  27  * \ingroup channel_drivers
  28  */
  29
  30 /*** MODULEINFO
  31         <depend>asound</depend>
  32  ***/
  33
  34 #include "asterisk.h"
  35
  36 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  37
  38 #include <unistd.h>
  39 #include <fcntl.h>
  40 #include <errno.h>
  41 #include <sys/ioctl.h>
  42 #include <sys/time.h>
  43 #include <string.h>
  44 #include <stdlib.h>
  45 #include <stdio.h>
  46
  47 #define ALSA_PCM_NEW_HW_PARAMS_API
  48 #define ALSA_PCM_NEW_SW_PARAMS_API
  49 #include <alsa/asoundlib.h>
  50
  51 #include "asterisk/frame.h"
  52 #include "asterisk/logger.h"
  53 #include "asterisk/channel.h"
  54 #include "asterisk/module.h"
  55 #include "asterisk/options.h"
  56 #include "asterisk/pbx.h"
  57 #include "asterisk/config.h"
  58 #include "asterisk/cli.h"
  59 #include "asterisk/utils.h"
  60 #include "asterisk/causes.h"
  61 #include "asterisk/endian.h"
  62 #include "asterisk/stringfields.h"
  63 #include "asterisk/abstract_jb.h"
  64 #include "asterisk/musiconhold.h"
  65
  66 #include "busy.h"
  67 #include "ringtone.h"
  68 #include "ring10.h"
  69 #include "answer.h"
  70
  71 #ifdef ALSA_MONITOR
  72 #include "alsa-monitor.h"
  73 #endif
  74
  75 /*! Global jitterbuffer configuration - by default, jb is disabled */
  76 static struct ast_jb_conf default_jbconf = {
  77         .flags = 0,
  78         .max_size = -1,
  79         .resync_threshold = -1,
  80         .impl = ""
  81 };
  82 static struct ast_jb_conf global_jbconf;
  83
  84 #define DEBUG 0
  85 /* Which device to use */
  86 #define ALSA_INDEV "default"
  87 #define ALSA_OUTDEV "default"
  88 #define DESIRED_RATE 8000
  89
  90 /* Lets use 160 sample frames, just like GSM.  */
  91 #define FRAME_SIZE 160
  92 #define PERIOD_FRAMES 80                /* 80 Frames, at 2 bytes each */
  93
  94 /* When you set the frame size, you have to come up with
  95    the right buffer format as well. */
  96 /* 5 64-byte frames = one frame */
  97 #define BUFFER_FMT ((buffersize * 10) << 16) | (0x0006);
  98
  99 /* Don't switch between read/write modes faster than every 300 ms */
 100 #define MIN_SWITCH_TIME 600
 101
 102 #if __BYTE_ORDER == __LITTLE_ENDIAN
 103 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
 104 #else
 105 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_BE;
 106 #endif
 107
 108 /* static int block = O_NONBLOCK; */
 109 static char indevname[50] = ALSA_INDEV;
 110 static char outdevname[50] = ALSA_OUTDEV;
 111
 112 #if 0
 113 static struct timeval lasttime;
 114 #endif
 115
 116 static int silencesuppression = 0;
 117 static int silencethreshold = 1000;
 118
 119 AST_MUTEX_DEFINE_STATIC(alsalock);
 120
 121 static const char tdesc[] = "ALSA Console Channel Driver";
 122 static const char config[] = "alsa.conf";
 123
 124 static char context[AST_MAX_CONTEXT] = "default";
 125 static char language[MAX_LANGUAGE] = "";
 126 static char exten[AST_MAX_EXTENSION] = "s";
 127 static char mohinterpret[MAX_MUSICCLASS];
 128
 129 static int hookstate = 0;
 130
 131 static short silence[FRAME_SIZE] = { 0, };
 132
 133 struct sound {
 134         int ind;
 135         short *data;
 136         int datalen;
 137         int samplen;
 138         int silencelen;
 139         int repeat;
 140 };
 141
 142 static struct sound sounds[] = {
 143         {AST_CONTROL_RINGING, ringtone, sizeof(ringtone) / 2, 16000, 32000, 1},
 144         {AST_CONTROL_BUSY, busy, sizeof(busy) / 2, 4000, 4000, 1},
 145         {AST_CONTROL_CONGESTION, busy, sizeof(busy) / 2, 2000, 2000, 1},
 146         {AST_CONTROL_RING, ring10, sizeof(ring10) / 2, 16000, 32000, 1},
 147         {AST_CONTROL_ANSWER, answer, sizeof(answer) / 2, 2200, 0, 0},
 148 };
 149
 150 /* Sound command pipe */
 151 static int sndcmd[2];
 152
 153 static struct chan_alsa_pvt {
 154         /* We only have one ALSA structure -- near sighted perhaps, but it
 155            keeps this driver as simple as possible -- as it should be. */
 156         struct ast_channel *owner;
 157         char exten[AST_MAX_EXTENSION];
 158         char context[AST_MAX_CONTEXT];
 159 #if 0
 160         snd_pcm_t *card;
 161 #endif
 162         snd_pcm_t *icard, *ocard;
 163
 164 } alsa;
 165
 166 /* Number of buffers...  Each is FRAMESIZE/8 ms long.  For example
 167    with 160 sample frames, and a buffer size of 3, we have a 60ms buffer,
 168    usually plenty. */
 169
 170 pthread_t sthread;
 171
 172 #define MAX_BUFFER_SIZE 100
 173
 174 /* File descriptors for sound device */
 175 static int readdev = -1;
 176 static int writedev = -1;
 177
 178 static int autoanswer = 1;
 179
 180 static int cursound = -1;
 181 static int sampsent = 0;
 182 static int silencelen = 0;
 183 static int offset = 0;
 184 static int nosound = 0;
 185
 186 /* ZZ */
 187 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause);
 188 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration);
 189 static int alsa_text(struct ast_channel *c, const char *text);
 190 static int alsa_hangup(struct ast_channel *c);
 191 static int alsa_answer(struct ast_channel *c);
 192 static struct ast_frame *alsa_read(struct ast_channel *chan);
 193 static int alsa_call(struct ast_channel *c, char *dest, int timeout);
 194 static int alsa_write(struct ast_channel *chan, struct ast_frame *f);
 195 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen);
 196 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
 197
 198 static const struct ast_channel_tech alsa_tech = {
 199         .type = "Console",
 200         .description = tdesc,
 201         .capabilities = AST_FORMAT_SLINEAR,
 202         .requester = alsa_request,
 203         .send_digit_end = alsa_digit,
 204         .send_text = alsa_text,
 205         .hangup = alsa_hangup,
 206         .answer = alsa_answer,
 207         .read = alsa_read,
 208         .call = alsa_call,
 209         .write = alsa_write,
 210         .indicate = alsa_indicate,
 211         .fixup = alsa_fixup,
 212 };
 213
 214 static int send_sound(void)
 215 {
 216         short myframe[FRAME_SIZE];
 217         int total = FRAME_SIZE;
 218         short *frame = NULL;
 219         int amt = 0, res, myoff;
 220         snd_pcm_state_t state;
 221
 222         if (cursound == -1)
 223                 return 0;
 224
 225         res = total;
 226         if (sampsent < sounds[cursound].samplen) {
 227                 myoff = 0;
 228                 while (total) {
 229                         amt = total;
 230                         if (amt > (sounds[cursound].datalen - offset))
 231                                 amt = sounds[cursound].datalen - offset;
 232                         memcpy(myframe + myoff, sounds[cursound].data + offset, amt * 2);
 233                         total -= amt;
 234                         offset += amt;
 235                         sampsent += amt;
 236                         myoff += amt;
 237                         if (offset >= sounds[cursound].datalen)
 238                                 offset = 0;
 239                 }
 240                 /* Set it up for silence */
 241                 if (sampsent >= sounds[cursound].samplen)
 242                         silencelen = sounds[cursound].silencelen;
 243                 frame = myframe;
 244         } else {
 245                 if (silencelen > 0) {
 246                         frame = silence;
 247                         silencelen -= res;
 248                 } else {
 249                         if (sounds[cursound].repeat) {
 250                                 /* Start over */
 251                                 sampsent = 0;
 252                                 offset = 0;
 253                         } else {
 254                                 cursound = -1;
 255                                 nosound = 0;
 256                         }
 257                         return 0;
 258                 }
 259         }
 260
 261         if (res == 0 || !frame)
 262                 return 0;
 263
 264 #ifdef ALSA_MONITOR
 265         alsa_monitor_write((char *) frame, res * 2);
 266 #endif
 267         state = snd_pcm_state(alsa.ocard);
 268         if (state == SND_PCM_STATE_XRUN)
 269                 snd_pcm_prepare(alsa.ocard);
 270         res = snd_pcm_writei(alsa.ocard, frame, res);
 271         if (res > 0)
 272                 return 0;
 273         return 0;
 274 }
 275
 276 static void *sound_thread(void *unused)
 277 {
 278         fd_set rfds;
 279         fd_set wfds;
 280         int max, res;
 281
 282         for (;;) {
 283                 FD_ZERO(&rfds);
 284                 FD_ZERO(&wfds);
 285                 max = sndcmd[0];
 286                 FD_SET(sndcmd[0], &rfds);
 287                 if (cursound > -1) {
 288                         FD_SET(writedev, &wfds);
 289                         if (writedev > max)
 290                                 max = writedev;
 291                 }
 292 #ifdef ALSA_MONITOR
 293                 if (!alsa.owner) {
 294                         FD_SET(readdev, &rfds);
 295                         if (readdev > max)
 296                                 max = readdev;
 297                 }
 298 #endif
 299                 res = ast_select(max + 1, &rfds, &wfds, NULL, NULL);
 300                 if (res < 1) {
 301                         ast_log(LOG_WARNING, "select failed: %s\n", strerror(errno));
 302                         continue;
 303                 }
 304 #ifdef ALSA_MONITOR
 305                 if (FD_ISSET(readdev, &rfds)) {
 306                         /* Keep the pipe going with read audio */
 307                         snd_pcm_state_t state;
 308                         short buf[FRAME_SIZE];
 309                         int r;
 310
 311                         state = snd_pcm_state(alsa.ocard);
 312                         if (state == SND_PCM_STATE_XRUN) {
 313                                 snd_pcm_prepare(alsa.ocard);
 314                         }
 315                         r = snd_pcm_readi(alsa.icard, buf, FRAME_SIZE);
 316                         if (r == -EPIPE) {
 317 #if DEBUG
 318                                 ast_log(LOG_ERROR, "XRUN read\n");
 319 #endif
 320                                 snd_pcm_prepare(alsa.icard);
 321                         } else if (r == -ESTRPIPE) {
 322                                 ast_log(LOG_ERROR, "-ESTRPIPE\n");
 323                                 snd_pcm_prepare(alsa.icard);
 324                         } else if (r < 0) {
 325                                 ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
 326                         } else
 327                                 alsa_monitor_read((char *) buf, r * 2);
 328                 }
 329 #endif
 330                 if (FD_ISSET(sndcmd[0], &rfds)) {
 331                         read(sndcmd[0], &cursound, sizeof(cursound));
 332                         silencelen = 0;
 333                         offset = 0;
 334                         sampsent = 0;
 335                 }
 336                 if (FD_ISSET(writedev, &wfds))
 337                         if (send_sound())
 338                                 ast_log(LOG_WARNING, "Failed to write sound\n");
 339         }
 340         /* Never reached */
 341         return NULL;
 342 }
 343
 344 static snd_pcm_t *alsa_card_init(char *dev, snd_pcm_stream_t stream)
 345 {
 346         int err;
 347         int direction;
 348         snd_pcm_t *handle = NULL;
 349         snd_pcm_hw_params_t *hwparams = NULL;
 350         snd_pcm_sw_params_t *swparams = NULL;
 351         struct pollfd pfd;
 352         snd_pcm_uframes_t period_size = PERIOD_FRAMES * 4;
 353         /* int period_bytes = 0; */
 354         snd_pcm_uframes_t buffer_size = 0;
 355
 356         unsigned int rate = DESIRED_RATE;
 357 #if 0
 358         unsigned int per_min = 1;
 359 #endif
 360         /* unsigned int per_max = 8; */
 361         snd_pcm_uframes_t start_threshold, stop_threshold;
 362
 363         err = snd_pcm_open(&handle, dev, stream, O_NONBLOCK);
 364         if (err < 0) {
 365                 ast_log(LOG_ERROR, "snd_pcm_open failed: %s\n", snd_strerror(err));
 366                 return NULL;
 367         } else
 368                 ast_log(LOG_DEBUG, "Opening device %s in %s mode\n", dev, (stream == SND_PCM_STREAM_CAPTURE) ? "read" : "write");
 369
 370         hwparams = alloca(snd_pcm_hw_params_sizeof());
 371         memset(hwparams, 0, snd_pcm_hw_params_sizeof());
 372         snd_pcm_hw_params_any(handle, hwparams);
 373
 374         err = snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
 375         if (err < 0)
 376                 ast_log(LOG_ERROR, "set_access failed: %s\n", snd_strerror(err));
 377
 378         err = snd_pcm_hw_params_set_format(handle, hwparams, format);
 379         if (err < 0)
 380                 ast_log(LOG_ERROR, "set_format failed: %s\n", snd_strerror(err));
 381
 382         err = snd_pcm_hw_params_set_channels(handle, hwparams, 1);
 383         if (err < 0)
 384                 ast_log(LOG_ERROR, "set_channels failed: %s\n", snd_strerror(err));
 385
 386         direction = 0;
 387         err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &rate, &direction);
 388         if (rate != DESIRED_RATE)
 389                 ast_log(LOG_WARNING, "Rate not correct, requested %d, got %d\n", DESIRED_RATE, rate);
 390
 391         direction = 0;
 392         err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, &direction);
 393         if (err < 0)
 394                 ast_log(LOG_ERROR, "period_size(%ld frames) is bad: %s\n", period_size, snd_strerror(err));
 395         else
 396                 ast_log(LOG_DEBUG, "Period size is %d\n", err);
 397
 398         buffer_size = 4096 * 2;         /* period_size * 16; */
 399         err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
 400         if (err < 0)
 401                 ast_log(LOG_WARNING, "Problem setting buffer size of %ld: %s\n", buffer_size, snd_strerror(err));
 402         else
 403                 ast_log(LOG_DEBUG, "Buffer size is set to %d frames\n", err);
 404
 405 #if 0
 406         direction = 0;
 407         err = snd_pcm_hw_params_set_periods_min(handle, hwparams, &per_min, &direction);
 408         if (err < 0)
 409                 ast_log(LOG_ERROR, "periods_min: %s\n", snd_strerror(err));
 410
 411         err = snd_pcm_hw_params_set_periods_max(handle, hwparams, &per_max, 0);
 412         if (err < 0)
 413                 ast_log(LOG_ERROR, "periods_max: %s\n", snd_strerror(err));
 414 #endif
 415
 416         err = snd_pcm_hw_params(handle, hwparams);
 417         if (err < 0)
 418                 ast_log(LOG_ERROR, "Couldn't set the new hw params: %s\n", snd_strerror(err));
 419
 420         swparams = alloca(snd_pcm_sw_params_sizeof());
 421         memset(swparams, 0, snd_pcm_sw_params_sizeof());
 422         snd_pcm_sw_params_current(handle, swparams);
 423
 424 #if 1
 425         if (stream == SND_PCM_STREAM_PLAYBACK)
 426                 start_threshold = period_size;
 427         else
 428                 start_threshold = 1;
 429
 430         err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
 431         if (err < 0)
 432                 ast_log(LOG_ERROR, "start threshold: %s\n", snd_strerror(err));
 433 #endif
 434
 435 #if 1
 436         if (stream == SND_PCM_STREAM_PLAYBACK)
 437                 stop_threshold = buffer_size;
 438         else
 439                 stop_threshold = buffer_size;
 440
 441         err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
 442         if (err < 0)
 443                 ast_log(LOG_ERROR, "stop threshold: %s\n", snd_strerror(err));
 444 #endif
 445 #if 0
 446         err = snd_pcm_sw_params_set_xfer_align(handle, swparams, PERIOD_FRAMES);
 447         if (err < 0)
 448                 ast_log(LOG_ERROR, "Unable to set xfer alignment: %s\n", snd_strerror(err));
 449 #endif
 450
 451 #if 0
 452         err = snd_pcm_sw_params_set_silence_threshold(handle, swparams, silencethreshold);
 453         if (err < 0)
 454                 ast_log(LOG_ERROR, "Unable to set silence threshold: %s\n", snd_strerror(err));
 455 #endif
 456         err = snd_pcm_sw_params(handle, swparams);
 457         if (err < 0)
 458                 ast_log(LOG_ERROR, "sw_params: %s\n", snd_strerror(err));
 459
 460         err = snd_pcm_poll_descriptors_count(handle);
 461         if (err <= 0)
 462                 ast_log(LOG_ERROR, "Unable to get a poll descriptors count, error is %s\n", snd_strerror(err));
 463         if (err != 1)
 464                 ast_log(LOG_DEBUG, "Can't handle more than one device\n");
 465
 466         snd_pcm_poll_descriptors(handle, &pfd, err);
 467         ast_log(LOG_DEBUG, "Acquired fd %d from the poll descriptor\n", pfd.fd);
 468
 469         if (stream == SND_PCM_STREAM_CAPTURE)
 470                 readdev = pfd.fd;
 471         else
 472                 writedev = pfd.fd;
 473
 474         return handle;
 475 }
 476
 477 static int soundcard_init(void)
 478 {
 479         alsa.icard = alsa_card_init(indevname, SND_PCM_STREAM_CAPTURE);
 480         alsa.ocard = alsa_card_init(outdevname, SND_PCM_STREAM_PLAYBACK);
 481
 482         if (!alsa.icard || !alsa.ocard) {
 483                 ast_log(LOG_ERROR, "Problem opening alsa I/O devices\n");
 484                 return -1;
 485         }
 486
 487         return readdev;
 488 }
 489
 490 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration)
 491 {
 492         ast_mutex_lock(&alsalock);
 493         ast_verbose(" << Console Received digit %c of duration %u ms >> \n",
 494                 digit, duration);
 495         ast_mutex_unlock(&alsalock);
 496         return 0;
 497 }
 498
 499 static int alsa_text(struct ast_channel *c, const char *text)
 500 {
 501         ast_mutex_lock(&alsalock);
 502         ast_verbose(" << Console Received text %s >> \n", text);
 503         ast_mutex_unlock(&alsalock);
 504         return 0;
 505 }
 506
 507 static void grab_owner(void)
 508 {
 509         while (alsa.owner && ast_mutex_trylock(&alsa.owner->lock)) {
 510                 ast_mutex_unlock(&alsalock);
 511                 usleep(1);
 512                 ast_mutex_lock(&alsalock);
 513         }
 514 }
 515
 516 static int alsa_call(struct ast_channel *c, char *dest, int timeout)
 517 {
 518         int res = 3;
 519         struct ast_frame f = { AST_FRAME_CONTROL };
 520         ast_mutex_lock(&alsalock);
 521         ast_verbose(" << Call placed to '%s' on console >> \n", dest);
 522         if (autoanswer) {
 523                 ast_verbose(" << Auto-answered >> \n");
 524                 grab_owner();
 525                 if (alsa.owner) {
 526                         f.subclass = AST_CONTROL_ANSWER;
 527                         ast_queue_frame(alsa.owner, &f);
 528                         ast_mutex_unlock(&alsa.owner->lock);
 529                 }
 530         } else {
 531                 ast_verbose(" << Type 'answer' to answer, or use 'autoanswer' for future calls >> \n");
 532                 grab_owner();
 533                 if (alsa.owner) {
 534                         f.subclass = AST_CONTROL_RINGING;
 535                         ast_queue_frame(alsa.owner, &f);
 536                         ast_mutex_unlock(&alsa.owner->lock);
 537                 }
 538                 write(sndcmd[1], &res, sizeof(res));
 539         }
 540         snd_pcm_prepare(alsa.icard);
 541         snd_pcm_start(alsa.icard);
 542         ast_mutex_unlock(&alsalock);
 543         return 0;
 544 }
 545
 546 static void answer_sound(void)
 547 {
 548         int res;
 549         nosound = 1;
 550         res = 4;
 551         write(sndcmd[1], &res, sizeof(res));
 552
 553 }
 554
 555 static int alsa_answer(struct ast_channel *c)
 556 {
 557         ast_mutex_lock(&alsalock);
 558         ast_verbose(" << Console call has been answered >> \n");
 559         answer_sound();
 560         ast_setstate(c, AST_STATE_UP);
 561         cursound = -1;
 562         snd_pcm_prepare(alsa.icard);
 563         snd_pcm_start(alsa.icard);
 564         ast_mutex_unlock(&alsalock);
 565         return 0;
 566 }
 567
 568 static int alsa_hangup(struct ast_channel *c)
 569 {
 570         int res;
 571         ast_mutex_lock(&alsalock);
 572         cursound = -1;
 573         c->tech_pvt = NULL;
 574         alsa.owner = NULL;
 575         ast_verbose(" << Hangup on console >> \n");
 576         ast_module_unref(ast_module_info->self);
 577         if (hookstate) {
 578                 hookstate = 0;
 579                 if (!autoanswer) {
 580                         /* Congestion noise */
 581                         res = 2;
 582                         write(sndcmd[1], &res, sizeof(res));
 583                 }
 584         }
 585         snd_pcm_drop(alsa.icard);
 586         ast_mutex_unlock(&alsalock);
 587         return 0;
 588 }
 589
 590 static int alsa_write(struct ast_channel *chan, struct ast_frame *f)
 591 {
 592         static char sizbuf[8000];
 593         static int sizpos = 0;
 594         int len = sizpos;
 595         int pos;
 596         int res = 0;
 597         /* size_t frames = 0; */
 598         snd_pcm_state_t state;
 599
 600         /* Immediately return if no sound is enabled */
 601         if (nosound)
 602                 return 0;
 603
 604         ast_mutex_lock(&alsalock);
 605         /* Stop any currently playing sound */
 606         if (cursound != -1) {
 607                 snd_pcm_drop(alsa.ocard);
 608                 snd_pcm_prepare(alsa.ocard);
 609                 cursound = -1;
 610         }
 611
 612
 613         /* We have to digest the frame in 160-byte portions */
 614         if (f->datalen > sizeof(sizbuf) - sizpos) {
 615                 ast_log(LOG_WARNING, "Frame too large\n");
 616                 res = -1;
 617         } else {
 618                 memcpy(sizbuf + sizpos, f->data, f->datalen);
 619                 len += f->datalen;
 620                 pos = 0;
 621 #ifdef ALSA_MONITOR
 622                 alsa_monitor_write(sizbuf, len);
 623 #endif
 624                 state = snd_pcm_state(alsa.ocard);
 625                 if (state == SND_PCM_STATE_XRUN)
 626                         snd_pcm_prepare(alsa.ocard);
 627                 res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2);
 628                 if (res == -EPIPE) {
 629 #if DEBUG
 630                         ast_log(LOG_DEBUG, "XRUN write\n");
 631 #endif
 632                         snd_pcm_prepare(alsa.ocard);
 633                         res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2);
 634                         if (res != len / 2) {
 635                                 ast_log(LOG_ERROR, "Write error: %s\n", snd_strerror(res));
 636                                 res = -1;
 637                         } else if (res < 0) {
 638                                 ast_log(LOG_ERROR, "Write error %s\n", snd_strerror(res));
 639                                 res = -1;
 640                         }
 641                 } else {
 642                         if (res == -ESTRPIPE)
 643                                 ast_log(LOG_ERROR, "You've got some big problems\n");
 644                         else if (res < 0)
 645                                 ast_log(LOG_NOTICE, "Error %d on write\n", res);
 646                 }
 647         }
 648         ast_mutex_unlock(&alsalock);
 649         if (res > 0)
 650                 res = 0;
 651         return res;
 652 }
 653
 654
 655 static struct ast_frame *alsa_read(struct ast_channel *chan)
 656 {
 657         static struct ast_frame f;
 658         static short __buf[FRAME_SIZE + AST_FRIENDLY_OFFSET / 2];
 659         short *buf;
 660         static int readpos = 0;
 661         static int left = FRAME_SIZE;
 662         snd_pcm_state_t state;
 663         int r = 0;
 664         int off = 0;
 665
 666         ast_mutex_lock(&alsalock);
 667         /* Acknowledge any pending cmd */
 668         f.frametype = AST_FRAME_NULL;
 669         f.subclass = 0;
 670         f.samples = 0;
 671         f.datalen = 0;
 672         f.data = NULL;
 673         f.offset = 0;
 674         f.src = "Console";
 675         f.mallocd = 0;
 676         f.delivery.tv_sec = 0;
 677         f.delivery.tv_usec = 0;
 678
 679         state = snd_pcm_state(alsa.icard);
 680         if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
 681                 snd_pcm_prepare(alsa.icard);
 682         }
 683
 684         buf = __buf + AST_FRIENDLY_OFFSET / 2;
 685
 686         r = snd_pcm_readi(alsa.icard, buf + readpos, left);
 687         if (r == -EPIPE) {
 688 #if DEBUG
 689                 ast_log(LOG_ERROR, "XRUN read\n");
 690 #endif
 691                 snd_pcm_prepare(alsa.icard);
 692         } else if (r == -ESTRPIPE) {
 693                 ast_log(LOG_ERROR, "-ESTRPIPE\n");
 694                 snd_pcm_prepare(alsa.icard);
 695         } else if (r < 0) {
 696                 ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
 697         } else if (r >= 0) {
 698                 off -= r;
 699         }
 700         /* Update positions */
 701         readpos += r;
 702         left -= r;
 703
 704         if (readpos >= FRAME_SIZE) {
 705                 /* A real frame */
 706                 readpos = 0;
 707                 left = FRAME_SIZE;
 708                 if (chan->_state != AST_STATE_UP) {
 709                         /* Don't transmit unless it's up */
 710                         ast_mutex_unlock(&alsalock);
 711                         return &f;
 712                 }
 713                 f.frametype = AST_FRAME_VOICE;
 714                 f.subclass = AST_FORMAT_SLINEAR;
 715                 f.samples = FRAME_SIZE;
 716                 f.datalen = FRAME_SIZE * 2;
 717                 f.data = buf;
 718                 f.offset = AST_FRIENDLY_OFFSET;
 719                 f.src = "Console";
 720                 f.mallocd = 0;
 721 #ifdef ALSA_MONITOR
 722                 alsa_monitor_read((char *) buf, FRAME_SIZE * 2);
 723 #endif
 724
 725         }
 726         ast_mutex_unlock(&alsalock);
 727         return &f;
 728 }
 729
 730 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
 731 {
 732         struct chan_alsa_pvt *p = newchan->tech_pvt;
 733         ast_mutex_lock(&alsalock);
 734         p->owner = newchan;
 735         ast_mutex_unlock(&alsalock);
 736         return 0;
 737 }
 738
 739 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen)
 740 {
 741         int res = 0;
 742
 743         ast_mutex_lock(&alsalock);
 744
 745         switch (cond) {
 746                 case AST_CONTROL_BUSY:
 747                         res = 1;
 748                         break;
 749                 case AST_CONTROL_CONGESTION:
 750                         res = 2;
 751                         break;
 752                 case AST_CONTROL_RINGING:
 753                 case AST_CONTROL_PROGRESS:
 754                         break;
 755                 case -1:
 756                         res = -1;
 757                         break;
 758                 case AST_CONTROL_VIDUPDATE:
 759                         res = -1;
 760                         break;
 761                 case AST_CONTROL_HOLD:
 762                         ast_verbose(" << Console Has Been Placed on Hold >> \n");
 763                         ast_moh_start(chan, data, mohinterpret);
 764                         break;
 765                 case AST_CONTROL_UNHOLD:
 766                         ast_verbose(" << Console Has Been Retrieved from Hold >> \n");
 767                         ast_moh_stop(chan);
 768                         break;
 769                 default:
 770                         ast_log(LOG_WARNING, "Don't know how to display condition %d on %s\n", cond, chan->name);
 771                         res = -1;
 772         }
 773
 774         if (res > -1)
 775                 write(sndcmd[1], &res, sizeof(res));
 776
 777         ast_mutex_unlock(&alsalock);
 778
 779         return res;
 780 }
 781
 782 static struct ast_channel *alsa_new(struct chan_alsa_pvt *p, int state)
 783 {
 784         struct ast_channel *tmp = NULL;
 785
 786         if (!(tmp = ast_channel_alloc(1, state, 0, 0, "", p->exten, p->context, 0, "ALSA/%s", indevname)))
 787                 return NULL;
 788
 789         tmp->tech = &alsa_tech;
 790         tmp->fds[0] = readdev;
 791         tmp->nativeformats = AST_FORMAT_SLINEAR;
 792         tmp->readformat = AST_FORMAT_SLINEAR;
 793         tmp->writeformat = AST_FORMAT_SLINEAR;
 794         tmp->tech_pvt = p;
 795         if (!ast_strlen_zero(p->context))
 796                 ast_copy_string(tmp->context, p->context, sizeof(tmp->context));
 797         if (!ast_strlen_zero(p->exten))
 798                 ast_copy_string(tmp->exten, p->exten, sizeof(tmp->exten));
 799         if (!ast_strlen_zero(language))
 800                 ast_string_field_set(tmp, language, language);
 801         p->owner = tmp;
 802         ast_module_ref(ast_module_info->self);
 803         ast_jb_configure(tmp, &global_jbconf);
 804         if (state != AST_STATE_DOWN) {
 805                 if (ast_pbx_start(tmp)) {
 806                         ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
 807                         ast_hangup(tmp);
 808                         tmp = NULL;
 809                 }
 810         }
 811
 812         return tmp;
 813 }
 814
 815 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause)
 816 {
 817         int oldformat = format;
 818         struct ast_channel *tmp = NULL;
 819
 820         format &= AST_FORMAT_SLINEAR;
 821         if (!format) {
 822                 ast_log(LOG_NOTICE, "Asked to get a channel of format '%d'\n", oldformat);
 823                 return NULL;
 824         }
 825
 826         ast_mutex_lock(&alsalock);
 827
 828         if (alsa.owner) {
 829                 ast_log(LOG_NOTICE, "Already have a call on the ALSA channel\n");
 830                 *cause = AST_CAUSE_BUSY;
 831         } else if (!(tmp = alsa_new(&alsa, AST_STATE_DOWN)))
 832                 ast_log(LOG_WARNING, "Unable to create new ALSA channel\n");
 833
 834         ast_mutex_unlock(&alsalock);
 835
 836         return tmp;
 837 }
 838
 839 static int console_autoanswer_deprecated(int fd, int argc, char *argv[])
 840 {
 841         int res = RESULT_SUCCESS;
 842
 843         if ((argc != 1) && (argc != 2))
 844                 return RESULT_SHOWUSAGE;
 845
 846         ast_mutex_lock(&alsalock);
 847
 848         if (argc == 1) {
 849                 ast_cli(fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
 850         } else {
 851                 if (!strcasecmp(argv[1], "on"))
 852                         autoanswer = -1;
 853                 else if (!strcasecmp(argv[1], "off"))
 854                         autoanswer = 0;
 855                 else
 856                         res = RESULT_SHOWUSAGE;
 857         }
 858
 859         ast_mutex_unlock(&alsalock);
 860
 861         return res;
 862 }
 863
 864 static int console_autoanswer(int fd, int argc, char *argv[])
 865 {
 866         int res = RESULT_SUCCESS;;
 867         if ((argc != 2) && (argc != 3))
 868                 return RESULT_SHOWUSAGE;
 869         ast_mutex_lock(&alsalock);
 870         if (argc == 2) {
 871                 ast_cli(fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
 872         } else {
 873                 if (!strcasecmp(argv[2], "on"))
 874                         autoanswer = -1;
 875                 else if (!strcasecmp(argv[2], "off"))
 876                         autoanswer = 0;
 877                 else
 878                         res = RESULT_SHOWUSAGE;
 879         }
 880         ast_mutex_unlock(&alsalock);
 881         return res;
 882 }
 883
 884 static char *autoanswer_complete(const char *line, const char *word, int pos, int state)
 885 {
 886 #ifndef MIN
 887 #define MIN(a,b) ((a) < (b) ? (a) : (b))
 888 #endif
 889         switch (state) {
 890                 case 0:
 891                         if (!ast_strlen_zero(word) && !strncasecmp(word, "on", MIN(strlen(word), 2)))
 892                                 return ast_strdup("on");
 893                 case 1:
 894                         if (!ast_strlen_zero(word) && !strncasecmp(word, "off", MIN(strlen(word), 3)))
 895                                 return ast_strdup("off");
 896                 default:
 897                         return NULL;
 898         }
 899         return NULL;
 900 }
 901
 902 static const char autoanswer_usage[] =
 903         "Usage: console autoanswer [on|off]\n"
 904         "       Enables or disables autoanswer feature.  If used without\n"
 905         "       argument, displays the current on/off status of autoanswer.\n"
 906         "       The default value of autoanswer is in 'alsa.conf'.\n";
 907
 908 static int console_answer_deprecated(int fd, int argc, char *argv[])
 909 {
 910         int res = RESULT_SUCCESS;
 911
 912         if (argc != 1)
 913                 return RESULT_SHOWUSAGE;
 914
 915         ast_mutex_lock(&alsalock);
 916
 917         if (!alsa.owner) {
 918                 ast_cli(fd, "No one is calling us\n");
 919                 res = RESULT_FAILURE;
 920         } else {
 921                 hookstate = 1;
 922                 cursound = -1;
 923                 grab_owner();
 924                 if (alsa.owner) {
 925                         struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
 926                         ast_queue_frame(alsa.owner, &f);
 927                         ast_mutex_unlock(&alsa.owner->lock);
 928                 }
 929                 answer_sound();
 930         }
 931
 932         snd_pcm_prepare(alsa.icard);
 933         snd_pcm_start(alsa.icard);
 934
 935         ast_mutex_unlock(&alsalock);
 936
 937         return RESULT_SUCCESS;
 938 }
 939
 940 static int console_answer(int fd, int argc, char *argv[])
 941 {
 942         int res = RESULT_SUCCESS;
 943
 944         if (argc != 2)
 945                 return RESULT_SHOWUSAGE;
 946
 947         ast_mutex_lock(&alsalock);
 948
 949         if (!alsa.owner) {
 950                 ast_cli(fd, "No one is calling us\n");
 951                 res = RESULT_FAILURE;
 952         } else {
 953                 hookstate = 1;
 954                 cursound = -1;
 955                 grab_owner();
 956                 if (alsa.owner) {
 957                         struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
 958                         ast_queue_frame(alsa.owner, &f);
 959                         ast_mutex_unlock(&alsa.owner->lock);
 960                 }
 961                 answer_sound();
 962         }
 963
 964         snd_pcm_prepare(alsa.icard);
 965         snd_pcm_start(alsa.icard);
 966
 967         ast_mutex_unlock(&alsalock);
 968
 969         return RESULT_SUCCESS;
 970 }
 971
 972 static char sendtext_usage[] =
 973         "Usage: console send text <message>\n"
 974         "       Sends a text message for display on the remote terminal.\n";
 975
 976 static int console_sendtext_deprecated(int fd, int argc, char *argv[])
 977 {
 978         int tmparg = 2;
 979         int res = RESULT_SUCCESS;
 980
 981         if (argc < 2)
 982                 return RESULT_SHOWUSAGE;
 983
 984         ast_mutex_lock(&alsalock);
 985
 986         if (!alsa.owner) {
 987                 ast_cli(fd, "No one is calling us\n");
 988                 res = RESULT_FAILURE;
 989         } else {
 990                 struct ast_frame f = { AST_FRAME_TEXT, 0 };
 991                 char text2send[256] = "";
 992                 text2send[0] = '\0';
 993                 while (tmparg < argc) {
 994                         strncat(text2send, argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
 995                         strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
 996                 }
 997                 text2send[strlen(text2send) - 1] = '\n';
 998                 f.data = text2send;
 999                 f.datalen = strlen(text2send) + 1;
1000                 grab_owner();
1001                 if (alsa.owner) {
1002                         ast_queue_frame(alsa.owner, &f);
1003                         f.frametype = AST_FRAME_CONTROL;
1004                         f.subclass = AST_CONTROL_ANSWER;
1005                         f.data = NULL;
1006                         f.datalen = 0;
1007                         ast_queue_frame(alsa.owner, &f);
1008                         ast_mutex_unlock(&alsa.owner->lock);
1009                 }
1010         }
1011
1012         ast_mutex_unlock(&alsalock);
1013
1014         return res;
1015 }
1016
1017 static int console_sendtext(int fd, int argc, char *argv[])
1018 {
1019         int tmparg = 3;
1020         int res = RESULT_SUCCESS;
1021
1022         if (argc < 3)
1023                 return RESULT_SHOWUSAGE;
1024
1025         ast_mutex_lock(&alsalock);
1026
1027         if (!alsa.owner) {
1028                 ast_cli(fd, "No one is calling us\n");
1029                 res = RESULT_FAILURE;
1030         } else {
1031                 struct ast_frame f = { AST_FRAME_TEXT, 0 };
1032                 char text2send[256] = "";
1033                 text2send[0] = '\0';
1034                 while (tmparg < argc) {
1035                         strncat(text2send, argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
1036                         strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
1037                 }
1038                 text2send[strlen(text2send) - 1] = '\n';
1039                 f.data = text2send;
1040                 f.datalen = strlen(text2send) + 1;
1041                 grab_owner();
1042                 if (alsa.owner) {
1043                         ast_queue_frame(alsa.owner, &f);
1044                         f.frametype = AST_FRAME_CONTROL;
1045                         f.subclass = AST_CONTROL_ANSWER;
1046                         f.data = NULL;
1047                         f.datalen = 0;
1048                         ast_queue_frame(alsa.owner, &f);
1049                         ast_mutex_unlock(&alsa.owner->lock);
1050                 }
1051         }
1052
1053         ast_mutex_unlock(&alsalock);
1054
1055         return res;
1056 }
1057
1058 static char answer_usage[] =
1059         "Usage: console answer\n"
1060         "       Answers an incoming call on the console (ALSA) channel.\n";
1061
1062 static int console_hangup_deprecated(int fd, int argc, char *argv[])
1063 {
1064         int res = RESULT_SUCCESS;
1065
1066         if (argc != 1)
1067                 return RESULT_SHOWUSAGE;
1068
1069         cursound = -1;
1070
1071         ast_mutex_lock(&alsalock);
1072
1073         if (!alsa.owner && !hookstate) {
1074                 ast_cli(fd, "No call to hangup up\n");
1075                 res = RESULT_FAILURE;
1076         } else {
1077                 hookstate = 0;
1078                 grab_owner();
1079                 if (alsa.owner) {
1080                         ast_queue_hangup(alsa.owner);
1081                         ast_mutex_unlock(&alsa.owner->lock);
1082                 }
1083         }
1084
1085         ast_mutex_unlock(&alsalock);
1086
1087         return res;
1088 }
1089
1090 static int console_hangup(int fd, int argc, char *argv[])
1091 {
1092         int res = RESULT_SUCCESS;
1093
1094         if (argc != 2)
1095                 return RESULT_SHOWUSAGE;
1096
1097         cursound = -1;
1098
1099         ast_mutex_lock(&alsalock);
1100
1101         if (!alsa.owner && !hookstate) {
1102                 ast_cli(fd, "No call to hangup up\n");
1103                 res = RESULT_FAILURE;
1104         } else {
1105                 hookstate = 0;
1106                 grab_owner();
1107                 if (alsa.owner) {
1108                         ast_queue_hangup(alsa.owner);
1109                         ast_mutex_unlock(&alsa.owner->lock);
1110                 }
1111         }
1112
1113         ast_mutex_unlock(&alsalock);
1114
1115         return res;
1116 }
1117
1118 static char hangup_usage[] =
1119         "Usage: console hangup\n"
1120         "       Hangs up any call currently placed on the console.\n";
1121
1122 static int console_dial_deprecated(int fd, int argc, char *argv[])
1123 {
1124         char tmp[256], *tmp2;
1125         char *mye, *myc;
1126         char *d;
1127         int res = RESULT_SUCCESS;
1128
1129         if ((argc != 1) && (argc != 2))
1130                 return RESULT_SHOWUSAGE;
1131
1132         ast_mutex_lock(&alsalock);
1133
1134         if (alsa.owner) {
1135                 if (argc == 2) {
1136                         d = argv[1];
1137                         grab_owner();
1138                         if (alsa.owner) {
1139                                 struct ast_frame f = { AST_FRAME_DTMF };
1140                                 while (*d) {
1141                                         f.subclass = *d;
1142                                         ast_queue_frame(alsa.owner, &f);
1143                                         d++;
1144                                 }
1145                                 ast_mutex_unlock(&alsa.owner->lock);
1146                         }
1147                 } else {
1148                         ast_cli(fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
1149                         res = RESULT_FAILURE;
1150                 }
1151         } else {
1152                 mye = exten;
1153                 myc = context;
1154                 if (argc == 2) {
1155                         char *stringp = NULL;
1156                         ast_copy_string(tmp, argv[1], sizeof(tmp));
1157                         stringp = tmp;
1158                         strsep(&stringp, "@");
1159                         tmp2 = strsep(&stringp, "@");
1160                         if (!ast_strlen_zero(tmp))
1161                                 mye = tmp;
1162                         if (!ast_strlen_zero(tmp2))
1163                                 myc = tmp2;
1164                 }
1165                 if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
1166                         ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
1167                         ast_copy_string(alsa.context, myc, sizeof(alsa.context));
1168                         hookstate = 1;
1169                         alsa_new(&alsa, AST_STATE_RINGING);
1170                 } else
1171                         ast_cli(fd, "No such extension '%s' in context '%s'\n", mye, myc);
1172         }
1173
1174         ast_mutex_unlock(&alsalock);
1175
1176         return res;
1177 }
1178
1179 static int console_dial(int fd, int argc, char *argv[])
1180 {
1181         char tmp[256], *tmp2;
1182         char *mye, *myc;
1183         char *d;
1184         int res = RESULT_SUCCESS;
1185
1186         if ((argc != 2) && (argc != 3))
1187                 return RESULT_SHOWUSAGE;
1188
1189         ast_mutex_lock(&alsalock);
1190
1191         if (alsa.owner) {
1192                 if (argc == 3) {
1193                         d = argv[2];
1194                         grab_owner();
1195                         if (alsa.owner) {
1196                                 struct ast_frame f = { AST_FRAME_DTMF };
1197                                 while (*d) {
1198                                         f.subclass = *d;
1199                                         ast_queue_frame(alsa.owner, &f);
1200                                         d++;
1201                                 }
1202                                 ast_mutex_unlock(&alsa.owner->lock);
1203                         }
1204                 } else {
1205                         ast_cli(fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
1206                         res = RESULT_FAILURE;
1207                 }
1208         } else {
1209                 mye = exten;
1210                 myc = context;
1211                 if (argc == 3) {
1212                         char *stringp = NULL;
1213                         ast_copy_string(tmp, argv[2], sizeof(tmp));
1214                         stringp = tmp;
1215                         strsep(&stringp, "@");
1216                         tmp2 = strsep(&stringp, "@");
1217                         if (!ast_strlen_zero(tmp))
1218                                 mye = tmp;
1219                         if (!ast_strlen_zero(tmp2))
1220                                 myc = tmp2;
1221                 }
1222                 if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
1223                         ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
1224                         ast_copy_string(alsa.context, myc, sizeof(alsa.context));
1225                         hookstate = 1;
1226                         alsa_new(&alsa, AST_STATE_RINGING);
1227                 } else
1228                         ast_cli(fd, "No such extension '%s' in context '%s'\n", mye, myc);
1229         }
1230
1231         ast_mutex_unlock(&alsalock);
1232
1233         return res;
1234 }
1235
1236 static char dial_usage[] =
1237         "Usage: console dial [extension[@context]]\n"
1238         "       Dials a given extension (and context if specified)\n";
1239
1240 static struct ast_cli_entry cli_alsa_answer_deprecated = {
1241         { "answer", NULL },
1242         console_answer_deprecated, NULL,
1243         NULL };
1244
1245 static struct ast_cli_entry cli_alsa_hangup_deprecated = {
1246         { "hangup", NULL },
1247         console_hangup_deprecated, NULL,
1248         NULL };
1249
1250 static struct ast_cli_entry cli_alsa_dial_deprecated = {
1251         { "dial", NULL },
1252         console_dial_deprecated, NULL,
1253         NULL };
1254
1255 static struct ast_cli_entry cli_alsa_send_text_deprecated = {
1256         { "send", "text", NULL },
1257         console_sendtext_deprecated, NULL,
1258         NULL };
1259
1260 static struct ast_cli_entry cli_alsa_autoanswer_deprecated = {
1261         { "autoanswer", NULL },
1262         console_autoanswer_deprecated, NULL,
1263         NULL, autoanswer_complete };
1264
1265 static struct ast_cli_entry cli_alsa[] = {
1266         { { "console", "answer", NULL },
1267         console_answer, "Answer an incoming console call",
1268         answer_usage, NULL, &cli_alsa_answer_deprecated },
1269
1270         { { "console", "hangup", NULL },
1271         console_hangup, "Hangup a call on the console",
1272         hangup_usage, NULL, &cli_alsa_hangup_deprecated },
1273
1274         { { "console", "dial", NULL },
1275         console_dial, "Dial an extension on the console",
1276         dial_usage, NULL, &cli_alsa_dial_deprecated },
1277
1278         { { "console", "send", "text", NULL },
1279         console_sendtext, "Send text to the remote device",
1280         sendtext_usage, NULL, &cli_alsa_send_text_deprecated },
1281
1282         { { "console", "autoanswer", NULL },
1283         console_autoanswer, "Sets/displays autoanswer",
1284         autoanswer_usage, autoanswer_complete, &cli_alsa_autoanswer_deprecated },
1285 };
1286
1287 static int load_module(void)
1288 {
1289         int res;
1290         struct ast_config *cfg;
1291         struct ast_variable *v;
1292
1293         /* Copy the default jb config over global_jbconf */
1294         memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));
1295
1296         strcpy(mohinterpret, "default");
1297
1298         if ((cfg = ast_config_load(config))) {
1299                 v = ast_variable_browse(cfg, "general");
1300                 for (; v; v = v->next) {
1301                         /* handle jb conf */
1302                         if (!ast_jb_read_conf(&global_jbconf, v->name, v->value))
1303                                 continue;
1304
1305                         if (!strcasecmp(v->name, "autoanswer"))
1306                                 autoanswer = ast_true(v->value);
1307                         else if (!strcasecmp(v->name, "silencesuppression"))
1308                                 silencesuppression = ast_true(v->value);
1309                         else if (!strcasecmp(v->name, "silencethreshold"))
1310                                 silencethreshold = atoi(v->value);
1311                         else if (!strcasecmp(v->name, "context"))
1312                                 ast_copy_string(context, v->value, sizeof(context));
1313                         else if (!strcasecmp(v->name, "language"))
1314                                 ast_copy_string(language, v->value, sizeof(language));
1315                         else if (!strcasecmp(v->name, "extension"))
1316                                 ast_copy_string(exten, v->value, sizeof(exten));
1317                         else if (!strcasecmp(v->name, "input_device"))
1318                                 ast_copy_string(indevname, v->value, sizeof(indevname));
1319                         else if (!strcasecmp(v->name, "output_device"))
1320                                 ast_copy_string(outdevname, v->value, sizeof(outdevname));
1321                         else if (!strcasecmp(v->name, "mohinterpret"))
1322                                 ast_copy_string(mohinterpret, v->value, sizeof(mohinterpret));
1323                 }
1324                 ast_config_destroy(cfg);
1325         }
1326         res = pipe(sndcmd);
1327         if (res) {
1328                 ast_log(LOG_ERROR, "Unable to create pipe\n");
1329                 return -1;
1330         }
1331         res = soundcard_init();
1332         if (res < 0) {
1333                 if (option_verbose > 1) {
1334                         ast_verbose(VERBOSE_PREFIX_2 "No sound card detected -- console channel will be unavailable\n");
1335                         ast_verbose(VERBOSE_PREFIX_2 "Turn off ALSA support by adding 'noload=chan_alsa.so' in /etc/asterisk/modules.conf\n");
1336                 }
1337                 return 0;
1338         }
1339
1340         res = ast_channel_register(&alsa_tech);
1341         if (res < 0) {
1342                 ast_log(LOG_ERROR, "Unable to register channel class 'Console'\n");
1343                 return -1;
1344         }
1345         ast_cli_register_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
1346
1347         ast_pthread_create_background(&sthread, NULL, sound_thread, NULL);
1348 #ifdef ALSA_MONITOR
1349         if (alsa_monitor_start())
1350                 ast_log(LOG_ERROR, "Problem starting Monitoring\n");
1351 #endif
1352         return 0;
1353 }
1354
1355 static int unload_module(void)
1356 {
1357         ast_channel_unregister(&alsa_tech);
1358         ast_cli_unregister_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
1359
1360         if (alsa.icard)
1361                 snd_pcm_close(alsa.icard);
1362         if (alsa.ocard)
1363                 snd_pcm_close(alsa.ocard);
1364         if (sndcmd[0] > 0) {
1365                 close(sndcmd[0]);
1366                 close(sndcmd[1]);
1367         }
1368         if (alsa.owner)
1369                 ast_softhangup(alsa.owner, AST_SOFTHANGUP_APPUNLOAD);
1370         if (alsa.owner)
1371                 return -1;
1372         return 0;
1373 }
1374
1375 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "ALSA Console Channel Driver");