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 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
  36 #include "channelmap.h"
  37
  38 const char *const table[PA_CHANNEL_POSITION_MAX] = {
  39     [PA_CHANNEL_POSITION_MONO] = "mono",
  40
  41     [PA_CHANNEL_POSITION_FRONT_CENTER] = "front-center",
  42     [PA_CHANNEL_POSITION_FRONT_LEFT] = "front-left",
  43     [PA_CHANNEL_POSITION_FRONT_RIGHT] = "front-right",
  44
  45     [PA_CHANNEL_POSITION_REAR_CENTER] = "rear-center",
  46     [PA_CHANNEL_POSITION_REAR_LEFT] = "rear-left",
  47     [PA_CHANNEL_POSITION_REAR_RIGHT] = "rear-right",
  48
  49     [PA_CHANNEL_POSITION_LFE] = "lfe",
  50
  51     [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = "front-left-of-center",
  52     [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = "front-right-of-center",
  53
  54     [PA_CHANNEL_POSITION_SIDE_LEFT] = "side-left",
  55     [PA_CHANNEL_POSITION_SIDE_RIGHT] = "side-right",
  56
  57     [PA_CHANNEL_POSITION_AUX0] = "aux0",
  58     [PA_CHANNEL_POSITION_AUX1] = "aux1",
  59     [PA_CHANNEL_POSITION_AUX2] = "aux2",
  60     [PA_CHANNEL_POSITION_AUX3] = "aux3",
  61     [PA_CHANNEL_POSITION_AUX4] = "aux4",
  62     [PA_CHANNEL_POSITION_AUX5] = "aux5",
  63     [PA_CHANNEL_POSITION_AUX6] = "aux6",
  64     [PA_CHANNEL_POSITION_AUX7] = "aux7",
  65     [PA_CHANNEL_POSITION_AUX8] = "aux8",
  66     [PA_CHANNEL_POSITION_AUX9] = "aux9",
  67     [PA_CHANNEL_POSITION_AUX10] = "aux10",
  68     [PA_CHANNEL_POSITION_AUX11] = "aux11",
  69     [PA_CHANNEL_POSITION_AUX12] = "aux12",
  70     [PA_CHANNEL_POSITION_AUX13] = "aux13",
  71     [PA_CHANNEL_POSITION_AUX14] = "aux14",
  72     [PA_CHANNEL_POSITION_AUX15] = "aux15",
  73     [PA_CHANNEL_POSITION_AUX16] = "aux16",
  74     [PA_CHANNEL_POSITION_AUX17] = "aux17",
  75     [PA_CHANNEL_POSITION_AUX18] = "aux18",
  76     [PA_CHANNEL_POSITION_AUX19] = "aux19",
  77     [PA_CHANNEL_POSITION_AUX20] = "aux20",
  78     [PA_CHANNEL_POSITION_AUX21] = "aux21",
  79     [PA_CHANNEL_POSITION_AUX22] = "aux22",
  80     [PA_CHANNEL_POSITION_AUX23] = "aux23",
  81     [PA_CHANNEL_POSITION_AUX24] = "aux24",
  82     [PA_CHANNEL_POSITION_AUX25] = "aux25",
  83     [PA_CHANNEL_POSITION_AUX26] = "aux26",
  84     [PA_CHANNEL_POSITION_AUX27] = "aux27",
  85     [PA_CHANNEL_POSITION_AUX28] = "aux28",
  86     [PA_CHANNEL_POSITION_AUX29] = "aux29",
  87     [PA_CHANNEL_POSITION_AUX30] = "aux30",
  88     [PA_CHANNEL_POSITION_AUX31] = "aux31",
  89
  90     [PA_CHANNEL_POSITION_TOP_CENTER] = "top-center",
  91
  92     [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = "top-front-center",
  93     [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = "top-front-left",
  94     [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = "top-front-right",
  95
  96     [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = "top-rear-center",
  97     [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = "top-rear-left",
  98     [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = "top-rear-right"
  99 };
 100
 101 const char *const pretty_table[PA_CHANNEL_POSITION_MAX] = {
 102     [PA_CHANNEL_POSITION_MONO] = N_("Mono"),
 103
 104     [PA_CHANNEL_POSITION_FRONT_CENTER] = N_("Front Center"),
 105     [PA_CHANNEL_POSITION_FRONT_LEFT] = N_("Front Left"),
 106     [PA_CHANNEL_POSITION_FRONT_RIGHT] = N_("Front Right"),
 107
 108     [PA_CHANNEL_POSITION_REAR_CENTER] = N_("Rear Center"),
 109     [PA_CHANNEL_POSITION_REAR_LEFT] = N_("Rear Left"),
 110     [PA_CHANNEL_POSITION_REAR_RIGHT] = N_("Rear Right"),
 111
 112     [PA_CHANNEL_POSITION_LFE] = N_("Low Frequency Emmiter"),
 113
 114     [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = N_("Front Left-of-center"),
 115     [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = N_("Front Right-of-center"),
 116
 117     [PA_CHANNEL_POSITION_SIDE_LEFT] = N_("Side Left"),
 118     [PA_CHANNEL_POSITION_SIDE_RIGHT] = N_("Side Right"),
 119
 120     [PA_CHANNEL_POSITION_AUX0] = N_("Auxiliary 0"),
 121     [PA_CHANNEL_POSITION_AUX1] = N_("Auxiliary 1"),
 122     [PA_CHANNEL_POSITION_AUX2] = N_("Auxiliary 2"),
 123     [PA_CHANNEL_POSITION_AUX3] = N_("Auxiliary 3"),
 124     [PA_CHANNEL_POSITION_AUX4] = N_("Auxiliary 4"),
 125     [PA_CHANNEL_POSITION_AUX5] = N_("Auxiliary 5"),
 126     [PA_CHANNEL_POSITION_AUX6] = N_("Auxiliary 6"),
 127     [PA_CHANNEL_POSITION_AUX7] = N_("Auxiliary 7"),
 128     [PA_CHANNEL_POSITION_AUX8] = N_("Auxiliary 8"),
 129     [PA_CHANNEL_POSITION_AUX9] = N_("Auxiliary 9"),
 130     [PA_CHANNEL_POSITION_AUX10] = N_("Auxiliary 10"),
 131     [PA_CHANNEL_POSITION_AUX11] = N_("Auxiliary 11"),
 132     [PA_CHANNEL_POSITION_AUX12] = N_("Auxiliary 12"),
 133     [PA_CHANNEL_POSITION_AUX13] = N_("Auxiliary 13"),
 134     [PA_CHANNEL_POSITION_AUX14] = N_("Auxiliary 14"),
 135     [PA_CHANNEL_POSITION_AUX15] = N_("Auxiliary 15"),
 136     [PA_CHANNEL_POSITION_AUX16] = N_("Auxiliary 16"),
 137     [PA_CHANNEL_POSITION_AUX17] = N_("Auxiliary 17"),
 138     [PA_CHANNEL_POSITION_AUX18] = N_("Auxiliary 18"),
 139     [PA_CHANNEL_POSITION_AUX19] = N_("Auxiliary 19"),
 140     [PA_CHANNEL_POSITION_AUX20] = N_("Auxiliary 20"),
 141     [PA_CHANNEL_POSITION_AUX21] = N_("Auxiliary 21"),
 142     [PA_CHANNEL_POSITION_AUX22] = N_("Auxiliary 22"),
 143     [PA_CHANNEL_POSITION_AUX23] = N_("Auxiliary 23"),
 144     [PA_CHANNEL_POSITION_AUX24] = N_("Auxiliary 24"),
 145     [PA_CHANNEL_POSITION_AUX25] = N_("Auxiliary 25"),
 146     [PA_CHANNEL_POSITION_AUX26] = N_("Auxiliary 26"),
 147     [PA_CHANNEL_POSITION_AUX27] = N_("Auxiliary 27"),
 148     [PA_CHANNEL_POSITION_AUX28] = N_("Auxiliary 28"),
 149     [PA_CHANNEL_POSITION_AUX29] = N_("Auxiliary 29"),
 150     [PA_CHANNEL_POSITION_AUX30] = N_("Auxiliary 30"),
 151     [PA_CHANNEL_POSITION_AUX31] = N_("Auxiliary 31"),
 152
 153     [PA_CHANNEL_POSITION_TOP_CENTER] = N_("Top Center"),
 154
 155     [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = N_("Top Front Center"),
 156     [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = N_("Top Front Left"),
 157     [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = N_("Top Front Right"),
 158
 159     [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = N_("Top Rear Center"),
 160     [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = N_("Top Rear Left"),
 161     [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = N_("Top Rear Right")
 162 };
 163
 164 pa_channel_map* pa_channel_map_init(pa_channel_map *m) {
 165     unsigned c;
 166     pa_assert(m);
 167
 168     m->channels = 0;
 169
 170     for (c = 0; c < PA_CHANNELS_MAX; c++)
 171         m->map[c] = PA_CHANNEL_POSITION_INVALID;
 172
 173     return m;
 174 }
 175
 176 pa_channel_map* pa_channel_map_init_mono(pa_channel_map *m) {
 177     pa_assert(m);
 178
 179     pa_channel_map_init(m);
 180
 181     m->channels = 1;
 182     m->map[0] = PA_CHANNEL_POSITION_MONO;
 183     return m;
 184 }
 185
 186 pa_channel_map* pa_channel_map_init_stereo(pa_channel_map *m) {
 187     pa_assert(m);
 188
 189     pa_channel_map_init(m);
 190
 191     m->channels = 2;
 192     m->map[0] = PA_CHANNEL_POSITION_LEFT;
 193     m->map[1] = PA_CHANNEL_POSITION_RIGHT;
 194     return m;
 195 }
 196
 197 pa_channel_map* pa_channel_map_init_auto(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def) {
 198     pa_assert(m);
 199     pa_assert(channels > 0);
 200     pa_assert(channels <= PA_CHANNELS_MAX);
 201
 202     pa_channel_map_init(m);
 203
 204     m->channels = (uint8_t) channels;
 205
 206     switch (def) {
 207         case PA_CHANNEL_MAP_AIFF:
 208
 209             /* This is somewhat compatible with RFC3551 */
 210
 211             switch (channels) {
 212                 case 1:
 213                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 214                     return m;
 215
 216                 case 6:
 217                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 218                     m->map[1] = PA_CHANNEL_POSITION_SIDE_LEFT;
 219                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 220                     m->map[3] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 221                     m->map[4] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 222                     m->map[5] = PA_CHANNEL_POSITION_LFE;
 223                     return m;
 224
 225                 case 5:
 226                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 227                     m->map[3] = PA_CHANNEL_POSITION_REAR_LEFT;
 228                     m->map[4] = PA_CHANNEL_POSITION_REAR_RIGHT;
 229                     /* Fall through */
 230
 231                 case 2:
 232                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 233                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 234                     return m;
 235
 236                 case 3:
 237                     m->map[0] = PA_CHANNEL_POSITION_LEFT;
 238                     m->map[1] = PA_CHANNEL_POSITION_RIGHT;
 239                     m->map[2] = PA_CHANNEL_POSITION_CENTER;
 240                     return m;
 241
 242                 case 4:
 243                     m->map[0] = PA_CHANNEL_POSITION_LEFT;
 244                     m->map[1] = PA_CHANNEL_POSITION_CENTER;
 245                     m->map[2] = PA_CHANNEL_POSITION_RIGHT;
 246                     m->map[3] = PA_CHANNEL_POSITION_LFE;
 247                     return m;
 248
 249                 default:
 250                     return NULL;
 251             }
 252
 253         case PA_CHANNEL_MAP_ALSA:
 254
 255             switch (channels) {
 256                 case 1:
 257                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 258                     return m;
 259
 260                 case 8:
 261                     m->map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
 262                     m->map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 263                     /* Fall through */
 264
 265                 case 6:
 266                     m->map[5] = PA_CHANNEL_POSITION_LFE;
 267                     /* Fall through */
 268
 269                 case 5:
 270                     m->map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
 271                     /* Fall through */
 272
 273                 case 4:
 274                     m->map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
 275                     m->map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
 276                     /* Fall through */
 277
 278                 case 2:
 279                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 280                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 281                     return m;
 282
 283                 default:
 284                     return NULL;
 285             }
 286
 287         case PA_CHANNEL_MAP_AUX: {
 288             unsigned i;
 289
 290             if (channels >= PA_CHANNELS_MAX)
 291                 return NULL;
 292
 293             for (i = 0; i < channels; i++)
 294                 m->map[i] = PA_CHANNEL_POSITION_AUX0 + i;
 295
 296             return m;
 297         }
 298
 299         case PA_CHANNEL_MAP_WAVEEX:
 300
 301             switch (channels) {
 302                 case 1:
 303                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 304                     return m;
 305
 306                 case 18:
 307                     m->map[15] = PA_CHANNEL_POSITION_TOP_REAR_LEFT;
 308                     m->map[16] = PA_CHANNEL_POSITION_TOP_REAR_CENTER;
 309                     m->map[17] = PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
 310                     /* Fall through */
 311
 312                 case 15:
 313                     m->map[12] = PA_CHANNEL_POSITION_TOP_FRONT_LEFT;
 314                     m->map[13] = PA_CHANNEL_POSITION_TOP_FRONT_CENTER;
 315                     m->map[14] = PA_CHANNEL_POSITION_TOP_FRONT_RIGHT;
 316                     /* Fall through */
 317
 318                 case 12:
 319                     m->map[11] = PA_CHANNEL_POSITION_TOP_CENTER;
 320                     /* Fall through */
 321
 322                 case 11:
 323                     m->map[9] = PA_CHANNEL_POSITION_SIDE_LEFT;
 324                     m->map[10] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 325                     /* Fall through */
 326
 327                 case 9:
 328                     m->map[8] = PA_CHANNEL_POSITION_REAR_CENTER;
 329                     /* Fall through */
 330
 331                 case 8:
 332                     m->map[6] = PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
 333                     m->map[7] = PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
 334                     /* Fall through */
 335
 336                 case 6:
 337                     m->map[4] = PA_CHANNEL_POSITION_REAR_LEFT;
 338                     m->map[5] = PA_CHANNEL_POSITION_REAR_RIGHT;
 339                     /* Fall through */
 340
 341                 case 4:
 342                     m->map[3] = PA_CHANNEL_POSITION_LFE;
 343                     /* Fall through */
 344
 345                 case 3:
 346                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 347                     /* Fall through */
 348
 349                 case 2:
 350                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 351                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 352                     return m;
 353
 354                 default:
 355                     return NULL;
 356             }
 357
 358         case PA_CHANNEL_MAP_OSS:
 359
 360             switch (channels) {
 361                 case 1:
 362                     m->map[0] = PA_CHANNEL_POSITION_MONO;
 363                     return m;
 364
 365                 case 8:
 366                     m->map[6] = PA_CHANNEL_POSITION_REAR_LEFT;
 367                     m->map[7] = PA_CHANNEL_POSITION_REAR_RIGHT;
 368                     /* Fall through */
 369
 370                 case 6:
 371                     m->map[4] = PA_CHANNEL_POSITION_SIDE_LEFT;
 372                     m->map[5] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 373                     /* Fall through */
 374
 375                 case 4:
 376                     m->map[3] = PA_CHANNEL_POSITION_LFE;
 377                     /* Fall through */
 378
 379                 case 3:
 380                     m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
 381                     /* Fall through */
 382
 383                 case 2:
 384                     m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 385                     m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 386                     return m;
 387
 388                 default:
 389                     return NULL;
 390             }
 391
 392
 393         default:
 394             return NULL;
 395     }
 396 }
 397
 398 pa_channel_map* pa_channel_map_init_extend(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def) {
 399     unsigned c;
 400
 401     pa_assert(m);
 402     pa_assert(channels > 0);
 403     pa_assert(channels <= PA_CHANNELS_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     pa_init_i18n();
 438
 439     if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
 440         return NULL;
 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     if (a->channels != b->channels)
 452         return 0;
 453
 454     for (c = 0; c < a->channels; c++)
 455         if (a->map[c] != b->map[c])
 456             return 0;
 457
 458     return 1;
 459 }
 460
 461 char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map) {
 462     unsigned channel;
 463     pa_bool_t first = TRUE;
 464     char *e;
 465
 466     pa_assert(s);
 467     pa_assert(l > 0);
 468     pa_assert(map);
 469
 470     *(e = s) = 0;
 471
 472     for (channel = 0; channel < map->channels && l > 1; channel++) {
 473         l -= pa_snprintf(e, l, "%s%s",
 474                       first ? "" : ",",
 475                       pa_channel_position_to_string(map->map[channel]));
 476
 477         e = strchr(e, 0);
 478         first = FALSE;
 479     }
 480
 481     return s;
 482 }
 483
 484 pa_channel_map *pa_channel_map_parse(pa_channel_map *rmap, const char *s) {
 485     const char *state;
 486     pa_channel_map map;
 487     char *p;
 488
 489     pa_assert(rmap);
 490     pa_assert(s);
 491
 492     memset(&map, 0, sizeof(map));
 493
 494     if (strcmp(s, "stereo") == 0) {
 495         map.channels = 2;
 496         map.map[0] = PA_CHANNEL_POSITION_LEFT;
 497         map.map[1] = PA_CHANNEL_POSITION_RIGHT;
 498         goto finish;
 499     }
 500
 501     state = NULL;
 502     map.channels = 0;
 503
 504     while ((p = pa_split(s, ",", &state))) {
 505
 506         if (map.channels >= PA_CHANNELS_MAX) {
 507             pa_xfree(p);
 508             return NULL;
 509         }
 510
 511         /* Some special aliases */
 512         if (strcmp(p, "left") == 0)
 513             map.map[map.channels++] = PA_CHANNEL_POSITION_LEFT;
 514         else if (strcmp(p, "right") == 0)
 515             map.map[map.channels++] = PA_CHANNEL_POSITION_RIGHT;
 516         else if (strcmp(p, "center") == 0)
 517             map.map[map.channels++] = PA_CHANNEL_POSITION_CENTER;
 518         else if (strcmp(p, "subwoofer") == 0)
 519             map.map[map.channels++] = PA_CHANNEL_POSITION_SUBWOOFER;
 520         else {
 521             pa_channel_position_t i;
 522
 523             for (i = 0; i < PA_CHANNEL_POSITION_MAX; i++)
 524                 if (strcmp(p, table[i]) == 0) {
 525                     map.map[map.channels++] = i;
 526                     break;
 527                 }
 528
 529             if (i >= PA_CHANNEL_POSITION_MAX) {
 530                 pa_xfree(p);
 531                 return NULL;
 532             }
 533         }
 534
 535         pa_xfree(p);
 536     }
 537
 538 finish:
 539
 540     if (!pa_channel_map_valid(&map))
 541         return NULL;
 542
 543     *rmap = map;
 544     return rmap;
 545 }
 546
 547 int pa_channel_map_valid(const pa_channel_map *map) {
 548     unsigned c;
 549
 550     pa_assert(map);
 551
 552     if (map->channels <= 0 || map->channels > PA_CHANNELS_MAX)
 553         return 0;
 554
 555     for (c = 0; c < map->channels; c++) {
 556
 557         if (map->map[c] < 0 ||map->map[c] >= PA_CHANNEL_POSITION_MAX)
 558             return 0;
 559     }
 560
 561     return 1;
 562 }