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