code.delx.au - pulseaudio/blob - src/pulse/channelmap.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2005-2006 Lennart Poettering
   5   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include <pulse/xmalloc.h>
  32 #include <pulse/i18n.h>
  33 #include <pulsecore/core-util.h>
  34 #include <pulsecore/macro.h>
  35 #include <pulsecore/bitset.h>
  36
  37 #include "channelmap.h"
  38
  39 const char *const table[PA_CHANNEL_POSITION_MAX] = {
  40     [PA_CHANNEL_POSITION_MONO] = "mono",
  41
  42     [PA_CHANNEL_POSITION_FRONT_CENTER] = "front-center",
  43     [PA_CHANNEL_POSITION_FRONT_LEFT] = "front-left",
  44     [PA_CHANNEL_POSITION_FRONT_RIGHT] = "front-right",
  45
  46     [PA_CHANNEL_POSITION_REAR_CENTER] = "rear-center",
  47     [PA_CHANNEL_POSITION_REAR_LEFT] = "rear-left",
  48     [PA_CHANNEL_POSITION_REAR_RIGHT] = "rear-right",
  49
  50     [PA_CHANNEL_POSITION_LFE] = "lfe",
  51
  52     [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = "front-left-of-center",
  53     [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = "front-right-of-center",
  54
  55     [PA_CHANNEL_POSITION_SIDE_LEFT] = "side-left",
  56     [PA_CHANNEL_POSITION_SIDE_RIGHT] = "side-right",
  57
  58     [PA_CHANNEL_POSITION_AUX0] = "aux0",
  59     [PA_CHANNEL_POSITION_AUX1] = "aux1",
  60     [PA_CHANNEL_POSITION_AUX2] = "aux2",
  61     [PA_CHANNEL_POSITION_AUX3] = "aux3",
  62     [PA_CHANNEL_POSITION_AUX4] = "aux4",
  63     [PA_CHANNEL_POSITION_AUX5] = "aux5",
  64     [PA_CHANNEL_POSITION_AUX6] = "aux6",
  65     [PA_CHANNEL_POSITION_AUX7] = "aux7",
  66     [PA_CHANNEL_POSITION_AUX8] = "aux8",
  67     [PA_CHANNEL_POSITION_AUX9] = "aux9",
  68     [PA_CHANNEL_POSITION_AUX10] = "aux10",
  69     [PA_CHANNEL_POSITION_AUX11] = "aux11",
  70     [PA_CHANNEL_POSITION_AUX12] = "aux12",
  71     [PA_CHANNEL_POSITION_AUX13] = "aux13",
  72     [PA_CHANNEL_POSITION_AUX14] = "aux14",
  73     [PA_CHANNEL_POSITION_AUX15] = "aux15",
  74     [PA_CHANNEL_POSITION_AUX16] = "aux16",
  75     [PA_CHANNEL_POSITION_AUX17] = "aux17",
  76     [PA_CHANNEL_POSITION_AUX18] = "aux18",
  77     [PA_CHANNEL_POSITION_AUX19] = "aux19",
  78     [PA_CHANNEL_POSITION_AUX20] = "aux20",
  79     [PA_CHANNEL_POSITION_AUX21] = "aux21",
  80     [PA_CHANNEL_POSITION_AUX22] = "aux22",
  81     [PA_CHANNEL_POSITION_AUX23] = "aux23",
  82     [PA_CHANNEL_POSITION_AUX24] = "aux24",
  83     [PA_CHANNEL_POSITION_AUX25] = "aux25",
  84     [PA_CHANNEL_POSITION_AUX26] = "aux26",
  85     [PA_CHANNEL_POSITION_AUX27] = "aux27",
  86     [PA_CHANNEL_POSITION_AUX28] = "aux28",
  87     [PA_CHANNEL_POSITION_AUX29] = "aux29",
  88     [PA_CHANNEL_POSITION_AUX30] = "aux30",
  89     [PA_CHANNEL_POSITION_AUX31] = "aux31",
  90
  91     [PA_CHANNEL_POSITION_TOP_CENTER] = "top-center",
  92
  93     [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = "top-front-center",
  94     [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = "top-front-left",
  95     [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = "top-front-right",
  96
  97     [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = "top-rear-center",
  98     [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = "top-rear-left",
  99     [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = "top-rear-right"
 100 };
 101
 102 const char *const pretty_table[PA_CHANNEL_POSITION_MAX] = {
 103     [PA_CHANNEL_POSITION_MONO] = N_("Mono"),
 104
 105     [PA_CHANNEL_POSITION_FRONT_CENTER] = N_("Front Center"),
 106     [PA_CHANNEL_POSITION_FRONT_LEFT] = N_("Front Left"),
 107     [PA_CHANNEL_POSITION_FRONT_RIGHT] = N_("Front Right"),
 108
 109     [PA_CHANNEL_POSITION_REAR_CENTER] = N_("Rear Center"),
 110     [PA_CHANNEL_POSITION_REAR_LEFT] = N_("Rear Left"),
 111     [PA_CHANNEL_POSITION_REAR_RIGHT] = N_("Rear Right"),
 112
 113     [PA_CHANNEL_POSITION_LFE] = N_("Low Frequency Emmiter"),
 114
 115     [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = N_("Front Left-of-center"),
 116     [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = N_("Front Right-of-center"),
 117
 118     [PA_CHANNEL_POSITION_SIDE_LEFT] = N_("Side Left"),
 119     [PA_CHANNEL_POSITION_SIDE_RIGHT] = N_("Side Right"),
 120
 121     [PA_CHANNEL_POSITION_AUX0] = N_("Auxiliary 0"),
 122     [PA_CHANNEL_POSITION_AUX1] = N_("Auxiliary 1"),
 123     [PA_CHANNEL_POSITION_AUX2] = N_("Auxiliary 2"),
 124     [PA_CHANNEL_POSITION_AUX3] = N_("Auxiliary 3"),
 125     [PA_CHANNEL_POSITION_AUX4] = N_("Auxiliary 4"),
 126     [PA_CHANNEL_POSITION_AUX5] = N_("Auxiliary 5"),
 127     [PA_CHANNEL_POSITION_AUX6] = N_("Auxiliary 6"),
 128     [PA_CHANNEL_POSITION_AUX7] = N_("Auxiliary 7"),
 129     [PA_CHANNEL_POSITION_AUX8] = N_("Auxiliary 8"),
 130     [PA_CHANNEL_POSITION_AUX9] = N_("Auxiliary 9"),
 131     [PA_CHANNEL_POSITION_AUX10] = N_("Auxiliary 10"),
 132     [PA_CHANNEL_POSITION_AUX11] = N_("Auxiliary 11"),
 133     [PA_CHANNEL_POSITION_AUX12] = N_("Auxiliary 12"),
 134     [PA_CHANNEL_POSITION_AUX13] = N_("Auxiliary 13"),
 135     [PA_CHANNEL_POSITION_AUX14] = N_("Auxiliary 14"),
 136     [PA_CHANNEL_POSITION_AUX15] = N_("Auxiliary 15"),
 137     [PA_CHANNEL_POSITION_AUX16] = N_("Auxiliary 16"),
 138     [PA_CHANNEL_POSITION_AUX17] = N_("Auxiliary 17"),
 139     [PA_CHANNEL_POSITION_AUX18] = N_("Auxiliary 18"),
 140     [PA_CHANNEL_POSITION_AUX19] = N_("Auxiliary 19"),
 141     [PA_CHANNEL_POSITION_AUX20] = N_("Auxiliary 20"),
 142     [PA_CHANNEL_POSITION_AUX21] = N_("Auxiliary 21"),
 143     [PA_CHANNEL_POSITION_AUX22] = N_("Auxiliary 22"),
 144     [PA_CHANNEL_POSITION_AUX23] = N_("Auxiliary 23"),
 145     [PA_CHANNEL_POSITION_AUX24] = N_("Auxiliary 24"),
 146     [PA_CHANNEL_POSITION_AUX25] = N_("Auxiliary 25"),
 147     [PA_CHANNEL_POSITION_AUX26] = N_("Auxiliary 26"),
 148     [PA_CHANNEL_POSITION_AUX27] = N_("Auxiliary 27"),
 149     [PA_CHANNEL_POSITION_AUX28] = N_("Auxiliary 28"),
 150     [PA_CHANNEL_POSITION_AUX29] = N_("Auxiliary 29"),
 151     [PA_CHANNEL_POSITION_AUX30] = N_("Auxiliary 30"),
 152     [PA_CHANNEL_POSITION_AUX31] = N_("Auxiliary 31"),
 153
 154     [PA_CHANNEL_POSITION_TOP_CENTER] = N_("Top Center"),
 155
 156     [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = N_("Top Front Center"),
 157     [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = N_("Top Front Left"),
 158     [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = N_("Top Front Right"),
 159
 160     [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = N_("Top Rear Center"),
 161     [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = N_("Top Rear Left"),
 162     [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = N_("Top Rear Right")
 163 };
 164
 165 pa_channel_map* pa_channel_map_init(pa_channel_map *m) {
 166     unsigned c;
 167     pa_assert(m);
 168
 169     m->channels = 0;
 170
 171     for (c = 0; c < PA_CHANNELS_MAX; c++)
 172         m->map[c] = PA_CHANNEL_POSITION_INVALID;
 173
 174     return m;
 175 }
 176
 177 pa_channel_map* pa_channel_map_init_mono(pa_channel_map *m) {
 178     pa_assert(m);
 179
 180     pa_channel_map_init(m);
 181
 182     m->channels = 1;
 183     m->map[0] = PA_CHANNEL_POSITION_MONO;
 184     return m;
 185 }
 186
 187 pa_channel_map* pa_channel_map_init_stereo(pa_channel_map *m) {
 188     pa_assert(m);
 189
 190     pa_channel_map_init(m);
 191
 192     m->channels = 2;
 193     m->map[0] = PA_CHANNEL_POSITION_LEFT;
 194     m->map[1] = PA_CHANNEL_POSITION_RIGHT;
 195     return m;
 196 }
 197
 198 pa_channel_map* pa_channel_map_init_auto(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def) {
 199     pa_assert(m);
 200     pa_assert(channels > 0);
 201     pa_assert(channels <= PA_CHANNELS_MAX);
 202     pa_assert(def < PA_CHANNEL_MAP_DEF_MAX);
 203
 204     pa_channel_map_init(m);
 205
 206     m->channels = (uint8_t) channels;
 207
 208     switch (def) {
 209         case PA_CHANNEL_MAP_AIFF:
 210
 211             /* This is somewhat compatible with RFC3551 */
 212
 213             switch (channels) {
 214                 case 1:
 215                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 216                     return m;
 217
 218                 case 6:
 219                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 220                     m->map[1] = PA_CHANNEL_POSITION_REAR_LEFT;
 221                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 222                     m->map[3] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 223                     m->map[4] = PA_CHANNEL_POSITION_REAR_RIGHT;
 224                     m->map[5] = PA_CHANNEL_POSITION_LFE;
 225                     return m;
 226
 227                 case 5:
 228                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 229                     m->map[3] = PA_CHANNEL_POSITION_REAR_LEFT;
 230                     m->map[4] = PA_CHANNEL_POSITION_REAR_RIGHT;
 231                     /* Fall through */
 232
 233                 case 2:
 234                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 235                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 236                     return m;
 237
 238                 case 3:
 239                     m->map[0] = PA_CHANNEL_POSITION_LEFT;
 240                     m->map[1] = PA_CHANNEL_POSITION_RIGHT;
 241                     m->map[2] = PA_CHANNEL_POSITION_CENTER;
 242                     return m;
 243
 244                 case 4:
 245                     m->map[0] = PA_CHANNEL_POSITION_LEFT;
 246                     m->map[1] = PA_CHANNEL_POSITION_CENTER;
 247                     m->map[2] = PA_CHANNEL_POSITION_RIGHT;
 248                     m->map[3] = PA_CHANNEL_POSITION_LFE;
 249                     return m;
 250
 251                 default:
 252                     return NULL;
 253             }
 254
 255         case PA_CHANNEL_MAP_ALSA:
 256
 257             switch (channels) {
 258                 case 1:
 259                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 260                     return m;
 261
 262                 case 8:
 263                     m->map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
 264                     m->map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 265                     /* Fall through */
 266
 267                 case 6:
 268                     m->map[5] = PA_CHANNEL_POSITION_LFE;
 269                     /* Fall through */
 270
 271                 case 5:
 272                     m->map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
 273                     /* Fall through */
 274
 275                 case 4:
 276                     m->map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 277                     m->map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 278                     /* Fall through */
 279
 280                 case 2:
 281                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 282                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 283                     return m;
 284
 285                 default:
 286                     return NULL;
 287             }
 288
 289         case PA_CHANNEL_MAP_AUX: {
 290             unsigned i;
 291
 292             for (i = 0; i < channels; i++)
 293                 m->map[i] = PA_CHANNEL_POSITION_AUX0 + i;
 294
 295             return m;
 296         }
 297
 298         case PA_CHANNEL_MAP_WAVEEX:
 299
 300             switch (channels) {
 301                 case 1:
 302                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 303                     return m;
 304
 305                 case 18:
 306                     m->map[15] = PA_CHANNEL_POSITION_TOP_REAR_LEFT;
 307                     m->map[16] = PA_CHANNEL_POSITION_TOP_REAR_CENTER;
 308                     m->map[17] = PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
 309                     /* Fall through */
 310
 311                 case 15:
 312                     m->map[12] = PA_CHANNEL_POSITION_TOP_FRONT_LEFT;
 313                     m->map[13] = PA_CHANNEL_POSITION_TOP_FRONT_CENTER;
 314                     m->map[14] = PA_CHANNEL_POSITION_TOP_FRONT_RIGHT;
 315                     /* Fall through */
 316
 317                 case 12:
 318                     m->map[11] = PA_CHANNEL_POSITION_TOP_CENTER;
 319                     /* Fall through */
 320
 321                 case 11:
 322                     m->map[9] = PA_CHANNEL_POSITION_SIDE_LEFT;
 323                     m->map[10] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 324                     /* Fall through */
 325
 326                 case 9:
 327                     m->map[8] = PA_CHANNEL_POSITION_REAR_CENTER;
 328                     /* Fall through */
 329
 330                 case 8:
 331                     m->map[6] = PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
 332                     m->map[7] = PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
 333                     /* Fall through */
 334
 335                 case 6:
 336                     m->map[4] = PA_CHANNEL_POSITION_REAR_LEFT;
 337                     m->map[5] = PA_CHANNEL_POSITION_REAR_RIGHT;
 338                     /* Fall through */
 339
 340                 case 4:
 341                     m->map[3] = PA_CHANNEL_POSITION_LFE;
 342                     /* Fall through */
 343
 344                 case 3:
 345                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 346                     /* Fall through */
 347
 348                 case 2:
 349                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 350                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 351                     return m;
 352
 353                 default:
 354                     return NULL;
 355             }
 356
 357         case PA_CHANNEL_MAP_OSS:
 358
 359             switch (channels) {
 360                 case 1:
 361                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 362                     return m;
 363
 364                 case 8:
 365                     m->map[6] = PA_CHANNEL_POSITION_REAR_LEFT;
 366                     m->map[7] = PA_CHANNEL_POSITION_REAR_RIGHT;
 367                     /* Fall through */
 368
 369                 case 6:
 370                     m->map[4] = PA_CHANNEL_POSITION_SIDE_LEFT;
 371                     m->map[5] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 372                     /* Fall through */
 373
 374                 case 4:
 375                     m->map[3] = PA_CHANNEL_POSITION_LFE;
 376                     /* Fall through */
 377
 378                 case 3:
 379                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 380                     /* Fall through */
 381
 382                 case 2:
 383                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 384                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 385                     return m;
 386
 387                 default:
 388                     return NULL;
 389             }
 390
 391
 392         default:
 393             pa_assert_not_reached();
 394     }
 395 }
 396
 397 pa_channel_map* pa_channel_map_init_extend(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def) {
 398     unsigned c;
 399
 400     pa_assert(m);
 401     pa_assert(channels > 0);
 402     pa_assert(channels <= PA_CHANNELS_MAX);
 403     pa_assert(def < PA_CHANNEL_MAP_DEF_MAX);
 404
 405     pa_channel_map_init(m);
 406
 407     for (c = channels; c > 0; c--) {
 408
 409         if (pa_channel_map_init_auto(m, c, def)) {
 410             unsigned i = 0;
 411
 412             for (; c < channels; c++) {
 413
 414                 m->map[c] = PA_CHANNEL_POSITION_AUX0 + i;
 415                 i++;
 416             }
 417
 418             m->channels = (uint8_t) channels;
 419
 420             return m;
 421         }
 422     }
 423
 424     return NULL;
 425 }
 426
 427 const char* pa_channel_position_to_string(pa_channel_position_t pos) {
 428
 429     if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
 430         return NULL;
 431
 432     return table[pos];
 433 }
 434
 435 const char* pa_channel_position_to_pretty_string(pa_channel_position_t pos) {
 436
 437     if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
 438         return NULL;
 439
 440     pa_init_i18n();
 441
 442     return _(pretty_table[pos]);
 443 }
 444
 445 int pa_channel_map_equal(const pa_channel_map *a, const pa_channel_map *b) {
 446     unsigned c;
 447
 448     pa_assert(a);
 449     pa_assert(b);
 450
 451     pa_return_val_if_fail(pa_channel_map_valid(a), 0);
 452     pa_return_val_if_fail(pa_channel_map_valid(b), 0);
 453
 454     if (a->channels != b->channels)
 455         return 0;
 456
 457     for (c = 0; c < a->channels; c++)
 458         if (a->map[c] != b->map[c])
 459             return 0;
 460
 461     return 1;
 462 }
 463
 464 char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map) {
 465     unsigned channel;
 466     pa_bool_t first = TRUE;
 467     char *e;
 468
 469     pa_assert(s);
 470     pa_assert(l > 0);
 471     pa_assert(map);
 472
 473     pa_init_i18n();
 474
 475     if (!pa_channel_map_valid(map)) {
 476         pa_snprintf(s, l, _("(invalid)"));
 477         return s;
 478     }
 479
 480     *(e = s) = 0;
 481
 482     for (channel = 0; channel < map->channels && l > 1; channel++) {
 483         l -= pa_snprintf(e, l, "%s%s",
 484                       first ? "" : ",",
 485                       pa_channel_position_to_string(map->map[channel]));
 486
 487         e = strchr(e, 0);
 488         first = FALSE;
 489     }
 490
 491     return s;
 492 }
 493
 494 pa_channel_map *pa_channel_map_parse(pa_channel_map *rmap, const char *s) {
 495     const char *state;
 496     pa_channel_map map;
 497     char *p;
 498
 499     pa_assert(rmap);
 500     pa_assert(s);
 501
 502     pa_channel_map_init(&map);
 503
 504     /* We don't need to match against the well known channel mapping
 505      * "mono" here explicitly, because that can be understood as
 506      * listing with one channel called "mono". */
 507
 508     if (pa_streq(s, "stereo")) {
 509         map.channels = 2;
 510         map.map[0] = PA_CHANNEL_POSITION_LEFT;
 511         map.map[1] = PA_CHANNEL_POSITION_RIGHT;
 512         goto finish;
 513     } else if (pa_streq(s, "surround-40")) {
 514         map.channels = 4;
 515         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 516         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 517         map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 518         map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 519         goto finish;
 520     } else if (pa_streq(s, "surround-41")) {
 521         map.channels = 5;
 522         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 523         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 524         map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 525         map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 526         map.map[4] = PA_CHANNEL_POSITION_LFE;
 527         goto finish;
 528     } else if (pa_streq(s, "surround-50")) {
 529         map.channels = 5;
 530         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 531         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 532         map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 533         map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 534         map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
 535         goto finish;
 536     } else if (pa_streq(s, "surround-51")) {
 537         map.channels = 6;
 538         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 539         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 540         map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 541         map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 542         map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
 543         map.map[5] = PA_CHANNEL_POSITION_LFE;
 544         goto finish;
 545     } else if (pa_streq(s, "surround-71")) {
 546         map.channels = 8;
 547         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 548         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 549         map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 550         map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 551         map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
 552         map.map[5] = PA_CHANNEL_POSITION_LFE;
 553         map.map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
 554         map.map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 555         goto finish;
 556     }
 557
 558     state = NULL;
 559     map.channels = 0;
 560
 561     while ((p = pa_split(s, ",", &state))) {
 562
 563         if (map.channels >= PA_CHANNELS_MAX) {
 564             pa_xfree(p);
 565             return NULL;
 566         }
 567
 568         /* Some special aliases */
 569         if (pa_streq(p, "left"))
 570             map.map[map.channels++] = PA_CHANNEL_POSITION_LEFT;
 571         else if (pa_streq(p, "right"))
 572             map.map[map.channels++] = PA_CHANNEL_POSITION_RIGHT;
 573         else if (pa_streq(p, "center"))
 574             map.map[map.channels++] = PA_CHANNEL_POSITION_CENTER;
 575         else if (pa_streq(p, "subwoofer"))
 576             map.map[map.channels++] = PA_CHANNEL_POSITION_SUBWOOFER;
 577         else {
 578             pa_channel_position_t i;
 579
 580             for (i = 0; i < PA_CHANNEL_POSITION_MAX; i++)
 581                 if (strcmp(p, table[i]) == 0) {
 582                     map.map[map.channels++] = i;
 583                     break;
 584                 }
 585
 586             if (i >= PA_CHANNEL_POSITION_MAX) {
 587                 pa_xfree(p);
 588                 return NULL;
 589             }
 590         }
 591
 592         pa_xfree(p);
 593     }
 594
 595 finish:
 596
 597     if (!pa_channel_map_valid(&map))
 598         return NULL;
 599
 600     *rmap = map;
 601     return rmap;
 602 }
 603
 604 int pa_channel_map_valid(const pa_channel_map *map) {
 605     unsigned c;
 606
 607     pa_assert(map);
 608
 609     if (map->channels <= 0 || map->channels > PA_CHANNELS_MAX)
 610         return 0;
 611
 612     for (c = 0; c < map->channels; c++)
 613         if (map->map[c] < 0 || map->map[c] >= PA_CHANNEL_POSITION_MAX)
 614             return 0;
 615
 616     return 1;
 617 }
 618
 619 int pa_channel_map_compatible(const pa_channel_map *map, const pa_sample_spec *ss) {
 620     pa_assert(map);
 621     pa_assert(ss);
 622
 623     pa_return_val_if_fail(pa_channel_map_valid(map), 0);
 624     pa_return_val_if_fail(pa_sample_spec_valid(ss), 0);
 625
 626     return map->channels == ss->channels;
 627 }
 628
 629 int pa_channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) {
 630     pa_bitset_t in_a[PA_BITSET_ELEMENTS(PA_CHANNEL_POSITION_MAX)];
 631     unsigned i;
 632
 633     pa_assert(a);
 634     pa_assert(b);
 635
 636     pa_return_val_if_fail(pa_channel_map_valid(a), 0);
 637     pa_return_val_if_fail(pa_channel_map_valid(b), 0);
 638
 639     memset(in_a, 0, sizeof(in_a));
 640
 641     for (i = 0; i < a->channels; i++)
 642         pa_bitset_set(in_a, a->map[i], TRUE);
 643
 644     for (i = 0; i < b->channels; i++)
 645         if (!pa_bitset_get(in_a, b->map[i]))
 646             return 0;
 647
 648     return 1;
 649 }
 650
 651 int pa_channel_map_can_balance(const pa_channel_map *map) {
 652     unsigned c;
 653     pa_bool_t left = FALSE, right = FALSE;
 654
 655     pa_assert(map);
 656
 657     pa_return_val_if_fail(pa_channel_map_valid(map), 0);
 658
 659     for (c = 0; c < map->channels; c++) {
 660
 661         switch (map->map[c]) {
 662             case PA_CHANNEL_POSITION_LEFT:
 663             case PA_CHANNEL_POSITION_REAR_LEFT:
 664             case PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
 665             case PA_CHANNEL_POSITION_SIDE_LEFT:
 666             case PA_CHANNEL_POSITION_TOP_FRONT_LEFT:
 667             case PA_CHANNEL_POSITION_TOP_REAR_LEFT:
 668                 left = TRUE;
 669                 break;
 670
 671             case PA_CHANNEL_POSITION_RIGHT:
 672             case PA_CHANNEL_POSITION_REAR_RIGHT:
 673             case PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
 674             case PA_CHANNEL_POSITION_SIDE_RIGHT:
 675             case PA_CHANNEL_POSITION_TOP_FRONT_RIGHT:
 676             case PA_CHANNEL_POSITION_TOP_REAR_RIGHT:
 677                 right = TRUE;
 678                 break;
 679
 680             default:
 681                 ;
 682         }
 683
 684         if (left && right)
 685             return 1;
 686     }
 687
 688     return 0;
 689 }
 690
 691 int pa_channel_map_can_fade(const pa_channel_map *map) {
 692     unsigned c;
 693     pa_bool_t front = FALSE, rear = FALSE;
 694
 695     pa_assert(map);
 696
 697     pa_return_val_if_fail(pa_channel_map_valid(map), 0);
 698
 699     for (c = 0; c < map->channels; c++) {
 700
 701         switch (map->map[c]) {
 702             case PA_CHANNEL_POSITION_FRONT_LEFT:
 703             case PA_CHANNEL_POSITION_FRONT_RIGHT:
 704             case PA_CHANNEL_POSITION_FRONT_CENTER:
 705             case PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
 706             case PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
 707             case PA_CHANNEL_POSITION_TOP_FRONT_LEFT:
 708             case PA_CHANNEL_POSITION_TOP_FRONT_RIGHT:
 709             case PA_CHANNEL_POSITION_TOP_FRONT_CENTER:
 710                 front = TRUE;
 711                 break;
 712
 713             case PA_CHANNEL_POSITION_REAR_LEFT:
 714             case PA_CHANNEL_POSITION_REAR_RIGHT:
 715             case PA_CHANNEL_POSITION_REAR_CENTER:
 716             case PA_CHANNEL_POSITION_TOP_REAR_LEFT:
 717             case PA_CHANNEL_POSITION_TOP_REAR_RIGHT:
 718             case PA_CHANNEL_POSITION_TOP_REAR_CENTER:
 719                 rear = TRUE;
 720                 break;
 721
 722             default:
 723                 ;
 724         }
 725
 726         if (front && rear)
 727             return 1;
 728     }
 729
 730     return 0;
 731 }
 732
 733 const char* pa_channel_map_to_name(const pa_channel_map *map) {
 734     pa_bitset_t in_map[PA_BITSET_ELEMENTS(PA_CHANNEL_POSITION_MAX)];
 735     unsigned c;
 736
 737     pa_assert(map);
 738
 739     pa_return_val_if_fail(pa_channel_map_valid(map), NULL);
 740
 741     memset(in_map, 0, sizeof(in_map));
 742
 743     for (c = 0; c < map->channels; c++)
 744         pa_bitset_set(in_map, map->map[c], TRUE);
 745
 746     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 747                          PA_CHANNEL_POSITION_MONO, -1))
 748         return "mono";
 749
 750     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 751                          PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT, -1))
 752         return "stereo";
 753
 754     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 755                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 756                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, -1))
 757         return "surround-40";
 758
 759     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 760                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 761                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 762                          PA_CHANNEL_POSITION_LFE, -1))
 763         return "surround-41";
 764
 765     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 766                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 767                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 768                          PA_CHANNEL_POSITION_FRONT_CENTER, -1))
 769         return "surround-50";
 770
 771     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 772                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 773                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 774                          PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE, -1))
 775         return "surround-51";
 776
 777     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 778                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 779                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 780                          PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE,
 781                          PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT, -1))
 782         return "surround-71";
 783
 784     return NULL;
 785 }
 786
 787 const char* pa_channel_map_to_pretty_name(const pa_channel_map *map) {
 788     pa_bitset_t in_map[PA_BITSET_ELEMENTS(PA_CHANNEL_POSITION_MAX)];
 789     unsigned c;
 790
 791     pa_assert(map);
 792
 793     pa_return_val_if_fail(pa_channel_map_valid(map), NULL);
 794
 795     memset(in_map, 0, sizeof(in_map));
 796
 797     for (c = 0; c < map->channels; c++)
 798         pa_bitset_set(in_map, map->map[c], TRUE);
 799
 800     pa_init_i18n();
 801
 802     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 803                          PA_CHANNEL_POSITION_MONO, -1))
 804         return _("Mono");
 805
 806     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 807                          PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT, -1))
 808         return _("Stereo");
 809
 810     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 811                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 812                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, -1))
 813         return _("Surround 4.0");
 814
 815     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 816                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 817                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 818                          PA_CHANNEL_POSITION_LFE, -1))
 819         return _("Surround 4.1");
 820
 821     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 822                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 823                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 824                          PA_CHANNEL_POSITION_FRONT_CENTER, -1))
 825         return _("Surround 5.0");
 826
 827     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 828                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 829                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 830                          PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE, -1))
 831         return _("Surround 5.1");
 832
 833     if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
 834                          PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
 835                          PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
 836                          PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE,
 837                          PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT, -1))
 838         return _("Surround 7.1");
 839
 840     return NULL;
 841 }