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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <assert.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "channelmap.h"
  32
  33 pa_channel_map* pa_channel_map_init(pa_channel_map *m) {
  34     unsigned c;
  35     assert(m);
  36
  37     m->channels = 0;
  38
  39     for (c = 0; c < PA_CHANNELS_MAX; c++)
  40         m->map[c] = PA_CHANNEL_POSITION_INVALID;
  41
  42     return m;
  43 }
  44
  45 pa_channel_map* pa_channel_map_init_mono(pa_channel_map *m) {
  46     assert(m);
  47
  48     pa_channel_map_init(m);
  49
  50     m->channels = 1;
  51     m->map[0] = PA_CHANNEL_POSITION_MONO;
  52     return m;
  53 }
  54
  55 pa_channel_map* pa_channel_map_init_stereo(pa_channel_map *m) {
  56     assert(m);
  57
  58     pa_channel_map_init(m);
  59
  60     m->channels = 2;
  61     m->map[0] = PA_CHANNEL_POSITION_LEFT;
  62     m->map[1] = PA_CHANNEL_POSITION_RIGHT;
  63     return m;
  64 }
  65
  66 pa_channel_map* pa_channel_map_init_auto(pa_channel_map *m, unsigned channels) {
  67     assert(m);
  68     assert(channels > 0);
  69     assert(channels <= PA_CHANNELS_MAX);
  70
  71     pa_channel_map_init(m);
  72
  73     m->channels = channels;
  74
  75     /* This is somewhat compatible with RFC3551 */
  76
  77     switch (channels) {
  78         case 1:
  79             m->map[0] = PA_CHANNEL_POSITION_MONO;
  80             return m;
  81
  82         case 6:
  83             m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
  84             m->map[1] = PA_CHANNEL_POSITION_SIDE_LEFT;
  85             m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
  86             m->map[3] = PA_CHANNEL_POSITION_FRONT_RIGHT;
  87             m->map[4] = PA_CHANNEL_POSITION_SIDE_RIGHT;
  88             m->map[5] = PA_CHANNEL_POSITION_LFE;
  89             return m;
  90
  91         case 5:
  92             m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
  93             m->map[3] = PA_CHANNEL_POSITION_REAR_LEFT;
  94             m->map[4] = PA_CHANNEL_POSITION_REAR_RIGHT;
  95             /* Fall through */
  96
  97         case 2:
  98             m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
  99             m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 100             return m;
 101
 102         case 3:
 103             m->map[0] = PA_CHANNEL_POSITION_LEFT;
 104             m->map[1] = PA_CHANNEL_POSITION_RIGHT;
 105             m->map[2] = PA_CHANNEL_POSITION_CENTER;
 106             return m;
 107
 108         case 4:
 109             m->map[0] = PA_CHANNEL_POSITION_LEFT;
 110             m->map[1] = PA_CHANNEL_POSITION_CENTER;
 111             m->map[2] = PA_CHANNEL_POSITION_RIGHT;
 112             m->map[3] = PA_CHANNEL_POSITION_LFE;
 113             return m;
 114
 115         default:
 116             return NULL;
 117     }
 118 }
 119
 120 const char* pa_channel_position_to_string(pa_channel_position_t pos) {
 121
 122     const char *const table[] = {
 123         [PA_CHANNEL_POSITION_MONO] = "mono",
 124
 125         [PA_CHANNEL_POSITION_FRONT_CENTER] = "front-center",
 126         [PA_CHANNEL_POSITION_FRONT_LEFT] = "front-left",
 127         [PA_CHANNEL_POSITION_FRONT_RIGHT] = "front-right",
 128
 129         [PA_CHANNEL_POSITION_REAR_CENTER] = "rear-center",
 130         [PA_CHANNEL_POSITION_REAR_LEFT] = "rear-left",
 131         [PA_CHANNEL_POSITION_REAR_RIGHT] = "rear-right",
 132
 133         [PA_CHANNEL_POSITION_LFE] = "lfe",
 134
 135         [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = "front-left-of-center",
 136         [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = "front-right-of-center",
 137
 138         [PA_CHANNEL_POSITION_SIDE_LEFT] = "side-left",
 139         [PA_CHANNEL_POSITION_SIDE_RIGHT] = "side-right",
 140
 141         [PA_CHANNEL_POSITION_AUX1] = "aux1",
 142         [PA_CHANNEL_POSITION_AUX2] = "aux2",
 143         [PA_CHANNEL_POSITION_AUX3] = "aux3",
 144         [PA_CHANNEL_POSITION_AUX4] = "aux4",
 145         [PA_CHANNEL_POSITION_AUX5] = "aux5",
 146         [PA_CHANNEL_POSITION_AUX6] = "aux6",
 147         [PA_CHANNEL_POSITION_AUX7] = "aux7",
 148         [PA_CHANNEL_POSITION_AUX8] = "aux8",
 149         [PA_CHANNEL_POSITION_AUX9] = "aux9",
 150         [PA_CHANNEL_POSITION_AUX10] = "aux10",
 151         [PA_CHANNEL_POSITION_AUX11] = "aux11",
 152         [PA_CHANNEL_POSITION_AUX12] = "aux12"
 153     };
 154
 155     if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
 156         return NULL;
 157
 158     return table[pos];
 159 }
 160
 161 int pa_channel_map_equal(const pa_channel_map *a, const pa_channel_map *b) {
 162     unsigned c;
 163
 164     assert(a);
 165     assert(b);
 166
 167     if (a->channels != b->channels)
 168         return 0;
 169
 170     for (c = 0; c < a->channels; c++)
 171         if (a->map[c] != b->map[c])
 172             return 0;
 173
 174     return 1;
 175 }
 176
 177 char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map) {
 178     unsigned channel;
 179     int first = 1;
 180     char *e;
 181
 182     assert(s);
 183     assert(l > 0);
 184     assert(map);
 185
 186     *(e = s) = 0;
 187
 188     for (channel = 0; channel < map->channels && l > 1; channel++) {
 189         l -= snprintf(e, l, "%s%u:%s",
 190                       first ? "" : " ",
 191                       channel,
 192                       pa_channel_position_to_string(map->map[channel]));
 193
 194         e = strchr(e, 0);
 195         first = 0;
 196     }
 197
 198     return s;
 199 }
 200
 201 int pa_channel_map_valid(const pa_channel_map *map) {
 202     unsigned c;
 203
 204     assert(map);
 205
 206     if (map->channels <= 0 || map->channels > PA_CHANNELS_MAX)
 207         return 0;
 208
 209     for (c = 0; c < map->channels; c++)
 210         if (map->map[c] < 0 ||map->map[c] >= PA_CHANNEL_POSITION_MAX)
 211             return 0;
 212
 213     return 1;
 214 }