codecs/codec_dahdi.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * DAHDI native transcoding support
   5  *
   6  * Copyright (C) 1999 - 2008, Digium, Inc.
   7  *
   8  * Mark Spencer <markster@digium.com>
   9  * Kevin P. Fleming <kpfleming@digium.com>
  10  *
  11  * See http://www.asterisk.org for more information about
  12  * the Asterisk project. Please do not directly contact
  13  * any of the maintainers of this project for assistance;
  14  * the project provides a web site, mailing lists and IRC
  15  * channels for your use.
  16  *
  17  * This program is free software, distributed under the terms of
  18  * the GNU General Public License Version 2. See the LICENSE file
  19  * at the top of the source tree.
  20  */
  21
  22 /*! \file
  23  *
  24  * \brief Translate between various formats natively through DAHDI transcoding
  25  *
  26  * \ingroup codecs
  27  */
  28
  29 /*** MODULEINFO
  30         <depend>dahdi_transcode</depend>
  31         <depend>dahdi</depend>
  32  ***/
  33
  34 #include "asterisk.h"
  35
  36 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  37
  38 #include <fcntl.h>
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <netinet/in.h>
  42 #include <string.h>
  43 #include <stdio.h>
  44 #include <sys/ioctl.h>
  45 #include <errno.h>
  46 #include <sys/mman.h>
  47
  48 #include "asterisk/lock.h"
  49 #include "asterisk/translate.h"
  50 #include "asterisk/config.h"
  51 #include "asterisk/options.h"
  52 #include "asterisk/module.h"
  53 #include "asterisk/cli.h"
  54 #include "asterisk/logger.h"
  55 #include "asterisk/channel.h"
  56 #include "asterisk/utils.h"
  57 #include "asterisk/linkedlists.h"
  58 #include "asterisk/dahdi_compat.h"
  59
  60 #define BUFFER_SAMPLES  8000
  61
  62 static unsigned int global_useplc = 0;
  63
  64 static struct channel_usage {
  65         int total;
  66         int encoders;
  67         int decoders;
  68 } channels;
  69
  70 static char show_transcoder_usage[] =
  71 "Usage: show transcoder\n"
  72 "       Displays channel utilization of DAHDI transcoder(s).\n";
  73
  74 static char transcoder_show_usage[] =
  75 "Usage: transcoder show\n"
  76 "       Displays channel utilization of DAHDI transcoder(s).\n";
  77
  78 static int transcoder_show(int fd, int argc, char **argv);
  79
  80 static struct ast_cli_entry cli_deprecated[] = {
  81         { { "show", "transcoder", NULL },
  82           transcoder_show,
  83           "Display DAHDI transcoder utilization.",
  84           show_transcoder_usage}
  85 };
  86
  87 static struct ast_cli_entry cli[] = {
  88         { { "transcoder", "show", NULL },
  89           transcoder_show,
  90           "Display DAHDI transcoder utilization.",
  91           transcoder_show_usage, NULL,
  92           &cli_deprecated[0]}
  93 };
  94
  95 struct format_map {
  96         unsigned int map[32][32];
  97 };
  98
  99 static struct format_map global_format_map = { { { 0 } } };
 100
 101 struct translator {
 102         struct ast_translator t;
 103         AST_LIST_ENTRY(translator) entry;
 104 };
 105
 106 static AST_LIST_HEAD_STATIC(translators, translator);
 107
 108 struct pvt {
 109         int fd;
 110         int fake;
 111         int samples;
 112         struct dahdi_transcoder_formats fmts;
 113 };
 114
 115 static int transcoder_show(int fd, int argc, char **argv)
 116 {
 117         struct channel_usage copy;
 118
 119         copy = channels;
 120
 121         if (copy.total == 0)
 122                 ast_cli(fd, "No DAHDI transcoders found.\n");
 123         else
 124                 ast_cli(fd, "%d/%d encoders/decoders of %d channels are in use.\n", copy.encoders, copy.decoders, copy.total);
 125
 126         return RESULT_SUCCESS;
 127 }
 128
 129 static int zap_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
 130 {
 131         int res;
 132         struct pvt *ztp = pvt->pvt;
 133
 134         if (f->subclass) {
 135                 /* Give the frame to the hardware transcoder... */
 136                 res = write(ztp->fd, f->data, f->datalen);
 137                 if (-1 == res) {
 138                         ast_log(LOG_ERROR, "Failed to write to transcoder: %s\n", strerror(errno));
 139                 }
 140                 if (f->datalen != res) {
 141                         ast_log(LOG_ERROR, "Requested write of %d bytes, but only wrote %d bytes.\n", f->datalen, res);
 142                 }
 143                 res = -1;
 144                 pvt->samples += f->samples;
 145         } else {
 146                 /* Fake a return frame for calculation purposes */
 147                 ztp->fake = 2;
 148                 pvt->samples = f->samples;
 149                 res = 0;
 150         }
 151         return res;
 152 }
 153
 154 static struct ast_frame *zap_frameout(struct ast_trans_pvt *pvt)
 155 {
 156         struct pvt *ztp = pvt->pvt;
 157
 158         if (0 == ztp->fake) {
 159                 int res;
 160                 /* Let's check to see if there is a new frame for us.... */
 161                 res = read(ztp->fd, pvt->outbuf + pvt->datalen, pvt->t->buf_size - pvt->datalen);
 162                 if (-1 == res) {
 163                         if (EWOULDBLOCK == errno) {
 164                                 /* Nothing waiting... */
 165                                 return NULL;
 166                         } else {
 167                                 ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
 168                                 return NULL;
 169                         }
 170                 } else {
 171                         pvt->f.samples = ztp->samples;
 172                         pvt->f.datalen = res;
 173                         pvt->datalen = 0;
 174                         pvt->f.frametype = AST_FRAME_VOICE;
 175                         pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
 176                         pvt->f.mallocd = 0;
 177                         pvt->f.offset = AST_FRIENDLY_OFFSET;
 178                         pvt->f.src = pvt->t->name;
 179                         pvt->f.data = pvt->outbuf;
 180                         ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
 181
 182                         return &pvt->f;
 183                 }
 184
 185         } else if (2 == ztp->fake) {
 186
 187                 ztp->fake = 1;
 188                 pvt->f.frametype = AST_FRAME_VOICE;
 189                 pvt->f.subclass = 0;
 190                 pvt->f.samples = 160;
 191                 pvt->f.data = NULL;
 192                 pvt->f.offset = 0;
 193                 pvt->f.datalen = 0;
 194                 pvt->f.mallocd = 0;
 195                 ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
 196                 pvt->samples = 0;
 197
 198                 return &pvt->f;
 199
 200         } else if (1 == ztp->fake) {
 201
 202                 return NULL;
 203
 204         }
 205         /* Shouldn't get here... */
 206         return NULL;
 207 }
 208
 209 static void zap_destroy(struct ast_trans_pvt *pvt)
 210 {
 211         struct pvt *ztp = pvt->pvt;
 212
 213         switch (ztp->fmts.dstfmt) {
 214         case AST_FORMAT_G729A:
 215         case AST_FORMAT_G723_1:
 216                 ast_atomic_fetchadd_int(&channels.encoders, -1);
 217                 break;
 218         default:
 219                 ast_atomic_fetchadd_int(&channels.decoders, -1);
 220                 break;
 221         }
 222
 223         close(ztp->fd);
 224 }
 225
 226 static int zap_translate(struct ast_trans_pvt *pvt, int dest, int source)
 227 {
 228         /* Request translation through zap if possible */
 229         int fd;
 230         struct pvt *ztp = pvt->pvt;
 231         int flags;
 232
 233 #ifdef HAVE_ZAPTEL
 234         if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) {
 235                 ast_log(LOG_ERROR, "Failed to open /dev/zap/transcode: %s\n", strerror(errno));
 236                 return -1;
 237         }
 238 #else
 239         if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
 240                 ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
 241                 return -1;
 242         }
 243 #endif
 244
 245         ztp->fmts.srcfmt = (1 << source);
 246         ztp->fmts.dstfmt = (1 << dest);
 247
 248         ast_log(LOG_VERBOSE, "Opening transcoder channel from %d to %d.\n", source, dest);
 249
 250         if (ioctl(fd, DAHDI_TC_ALLOCATE, &ztp->fmts)) {
 251                 ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
 252                 close(fd);
 253
 254                 return -1;
 255         }
 256
 257         flags = fcntl(fd, F_GETFL);
 258         if (flags > - 1) {
 259                 if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
 260                         ast_log(LOG_WARNING, "Could not set non-block mode!\n");
 261         }
 262
 263         ztp->fd = fd;
 264
 265         switch (ztp->fmts.dstfmt) {
 266         case AST_FORMAT_G729A:
 267                 ztp->samples = 160;
 268                 break;
 269         case AST_FORMAT_G723_1:
 270                 ztp->samples = 240;
 271                 break;
 272         default:
 273                 ztp->samples = 160;
 274                 break;
 275         };
 276
 277         switch (ztp->fmts.dstfmt) {
 278         case AST_FORMAT_G729A:
 279                 ast_atomic_fetchadd_int(&channels.encoders, +1);
 280                 break;
 281         case AST_FORMAT_G723_1:
 282                 ast_atomic_fetchadd_int(&channels.encoders, +1);
 283                 break;
 284         default:
 285                 ast_atomic_fetchadd_int(&channels.decoders, +1);
 286                 break;
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int zap_new(struct ast_trans_pvt *pvt)
 293 {
 294         return zap_translate(pvt, pvt->t->dstfmt, pvt->t->srcfmt);
 295 }
 296
 297 static struct ast_frame *fakesrc_sample(void)
 298 {
 299         /* Don't bother really trying to test hardware ones. */
 300         static struct ast_frame f = {
 301                 .frametype = AST_FRAME_VOICE,
 302                 .samples = 160,
 303                 .src = __PRETTY_FUNCTION__
 304         };
 305
 306         return &f;
 307 }
 308
 309 static int register_translator(int dst, int src)
 310 {
 311         struct translator *zt;
 312         int res;
 313
 314         if (!(zt = ast_calloc(1, sizeof(*zt))))
 315                 return -1;
 316
 317         snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s",
 318                  ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
 319         zt->t.srcfmt = (1 << src);
 320         zt->t.dstfmt = (1 << dst);
 321         zt->t.newpvt = zap_new;
 322         zt->t.framein = zap_framein;
 323         zt->t.frameout = zap_frameout;
 324         zt->t.destroy = zap_destroy;
 325         zt->t.sample = fakesrc_sample;
 326         zt->t.useplc = global_useplc;
 327         zt->t.buf_size = BUFFER_SAMPLES * 2;
 328         zt->t.desc_size = sizeof(struct pvt);
 329         if ((res = ast_register_translator(&zt->t))) {
 330                 free(zt);
 331                 return -1;
 332         }
 333
 334         AST_LIST_LOCK(&translators);
 335         AST_LIST_INSERT_HEAD(&translators, zt, entry);
 336         AST_LIST_UNLOCK(&translators);
 337
 338         global_format_map.map[dst][src] = 1;
 339
 340         return res;
 341 }
 342
 343 static void drop_translator(int dst, int src)
 344 {
 345         struct translator *cur;
 346
 347         AST_LIST_LOCK(&translators);
 348         AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, cur, entry) {
 349                 if (cur->t.srcfmt != src)
 350                         continue;
 351
 352                 if (cur->t.dstfmt != dst)
 353                         continue;
 354
 355                 AST_LIST_REMOVE_CURRENT(&translators, entry);
 356                 ast_unregister_translator(&cur->t);
 357                 free(cur);
 358                 global_format_map.map[dst][src] = 0;
 359                 break;
 360         }
 361         AST_LIST_TRAVERSE_SAFE_END;
 362         AST_LIST_UNLOCK(&translators);
 363 }
 364
 365 static void unregister_translators(void)
 366 {
 367         struct translator *cur;
 368
 369         AST_LIST_LOCK(&translators);
 370         while ((cur = AST_LIST_REMOVE_HEAD(&translators, entry))) {
 371                 ast_unregister_translator(&cur->t);
 372                 free(cur);
 373         }
 374         AST_LIST_UNLOCK(&translators);
 375 }
 376
 377 static void parse_config(void)
 378 {
 379         struct ast_variable *var;
 380         struct ast_config *cfg = ast_config_load("codecs.conf");
 381
 382         if (!cfg)
 383                 return;
 384
 385         for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
 386                if (!strcasecmp(var->name, "genericplc")) {
 387                        global_useplc = ast_true(var->value);
 388                        if (option_verbose > 2)
 389                                ast_verbose(VERBOSE_PREFIX_3 "codec_zap: %susing generic PLC\n",
 390                                            global_useplc ? "" : "not ");
 391                }
 392         }
 393
 394         ast_config_destroy(cfg);
 395 }
 396
 397 static void build_translators(struct format_map *map, unsigned int dstfmts, unsigned int srcfmts)
 398 {
 399         unsigned int src, dst;
 400
 401         for (src = 0; src < 32; src++) {
 402                 for (dst = 0; dst < 32; dst++) {
 403                         if (!(srcfmts & (1 << src)))
 404                                 continue;
 405
 406                         if (!(dstfmts & (1 << dst)))
 407                                 continue;
 408
 409                         if (global_format_map.map[dst][src])
 410                                 continue;
 411
 412                         if (!register_translator(dst, src))
 413                                 map->map[dst][src] = 1;
 414                 }
 415         }
 416 }
 417
 418 static int find_transcoders(void)
 419 {
 420         struct dahdi_transcoder_info info = { 0, };
 421         struct format_map map = { { { 0 } } };
 422         int fd, res;
 423         unsigned int x, y;
 424
 425 #ifdef HAVE_ZAPTEL
 426         if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) {
 427                 ast_log(LOG_ERROR, "Failed to open /dev/zap/transcode: %s\n", strerror(errno));
 428                 return 0;
 429         }
 430 #else
 431         if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
 432                 ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
 433                 return 0;
 434         }
 435 #endif
 436
 437         for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TC_GETINFO, &info)); info.tcnum++) {
 438                 if (option_verbose > 1)
 439                         ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);
 440                 build_translators(&map, info.dstfmts, info.srcfmts);
 441                 ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);
 442         }
 443
 444         close(fd);
 445
 446         if (!info.tcnum && (option_verbose > 1))
 447                 ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n");
 448
 449         for (x = 0; x < 32; x++) {
 450                 for (y = 0; y < 32; y++) {
 451                         if (!map.map[x][y] && global_format_map.map[x][y])
 452                                 drop_translator(x, y);
 453                 }
 454         }
 455
 456         return 0;
 457 }
 458
 459 static int reload(void)
 460 {
 461         struct translator *cur;
 462
 463         parse_config();
 464
 465         AST_LIST_LOCK(&translators);
 466         AST_LIST_TRAVERSE(&translators, cur, entry)
 467                 cur->t.useplc = global_useplc;
 468         AST_LIST_UNLOCK(&translators);
 469
 470         return 0;
 471 }
 472
 473 static int unload_module(void)
 474 {
 475         ast_cli_unregister_multiple(cli, sizeof(cli) / sizeof(cli[0]));
 476         unregister_translators();
 477
 478         return 0;
 479 }
 480
 481 static int load_module(void)
 482 {
 483         parse_config();
 484         find_transcoders();
 485         ast_cli_register_multiple(cli, sizeof(cli) / sizeof(cli[0]));
 486
 487         return 0;
 488 }
 489
 490 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Generic DAHDI Transcoder Codec Translator",
 491                 .load = load_module,
 492                 .unload = unload_module,
 493                 .reload = reload,
 494                );