diff options
Diffstat (limited to 'src/polyp/channelmap.c')
| -rw-r--r-- | src/polyp/channelmap.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/src/polyp/channelmap.c b/src/polyp/channelmap.c new file mode 100644 index 00000000..7bfd21e6 --- /dev/null +++ b/src/polyp/channelmap.c @@ -0,0 +1,202 @@ +/* $Id$ */ + +/*** + This file is part of polypaudio. + + polypaudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2 of the License, + or (at your option) any later version. + + polypaudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with polypaudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <assert.h> +#include <stdio.h> +#include <string.h> + +#include "channelmap.h" + +pa_channel_map* pa_channel_map_init(pa_channel_map *m) { + unsigned c; + assert(m); + + m->channels = 0; + + for (c = 0; c < PA_CHANNELS_MAX; c++) + m->map[c] = PA_CHANNEL_POSITION_INVALID; + + return m; +} + +pa_channel_map* pa_channel_map_init_mono(pa_channel_map *m) { + assert(m); + + pa_channel_map_init(m); + + m->channels = 1; + m->map[0] = PA_CHANNEL_POSITION_MONO; + return m; +} + +pa_channel_map* pa_channel_map_init_stereo(pa_channel_map *m) { + assert(m); + + pa_channel_map_init(m); + + m->channels = 2; + m->map[0] = PA_CHANNEL_POSITION_LEFT; + m->map[1] = PA_CHANNEL_POSITION_RIGHT; + return m; +} + +pa_channel_map* pa_channel_map_init_auto(pa_channel_map *m, unsigned channels) { + assert(m); + assert(channels > 0); + assert(channels <= PA_CHANNELS_MAX); + + pa_channel_map_init(m); + + m->channels = channels; + + switch (channels) { + case 1: + m->map[0] = PA_CHANNEL_POSITION_MONO; + return m; + + case 8: + m->map[6] = PA_CHANNEL_POSITION_SIDE_LEFT; + m->map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT; + /* Fall through */ + + case 6: + m->map[5] = PA_CHANNEL_POSITION_LFE; + /* Fall through */ + + case 5: + m->map[4] = PA_CHANNEL_POSITION_FRONT_CENTER; + /* Fall through */ + + case 4: + m->map[2] = PA_CHANNEL_POSITION_REAR_LEFT; + m->map[3] = PA_CHANNEL_POSITION_REAR_RIGHT; + /* Fall through */ + + case 2: + m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT; + m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT; + return m; + + default: + return NULL; + } +} + +const char* pa_channel_position_to_string(pa_channel_position_t pos) { + + const char *const table[] = { + [PA_CHANNEL_POSITION_MONO] = "mono", + + [PA_CHANNEL_POSITION_FRONT_CENTER] = "front-center", + [PA_CHANNEL_POSITION_FRONT_LEFT] = "front-left", + [PA_CHANNEL_POSITION_FRONT_RIGHT] = "front-right", + + [PA_CHANNEL_POSITION_REAR_CENTER] = "rear-center", + [PA_CHANNEL_POSITION_REAR_LEFT] = "rear-left", + [PA_CHANNEL_POSITION_REAR_RIGHT] = "rear-right", + + [PA_CHANNEL_POSITION_LFE] = "lfe", + + [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = "front-left-of-center", + [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = "front-right-of-center", + + [PA_CHANNEL_POSITION_SIDE_LEFT] = "side-left", + [PA_CHANNEL_POSITION_SIDE_RIGHT] = "side-right", + + [PA_CHANNEL_POSITION_AUX1] = "aux1", + [PA_CHANNEL_POSITION_AUX2] = "aux2", + [PA_CHANNEL_POSITION_AUX3] = "aux3", + [PA_CHANNEL_POSITION_AUX4] = "aux4", + [PA_CHANNEL_POSITION_AUX5] = "aux5", + [PA_CHANNEL_POSITION_AUX6] = "aux6", + [PA_CHANNEL_POSITION_AUX7] = "aux7", + [PA_CHANNEL_POSITION_AUX8] = "aux8", + [PA_CHANNEL_POSITION_AUX9] = "aux9", + [PA_CHANNEL_POSITION_AUX10] = "aux10", + [PA_CHANNEL_POSITION_AUX11] = "aux11", + [PA_CHANNEL_POSITION_AUX12] = "aux12" + }; + + if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX) + return NULL; + + return table[pos]; +} + +int pa_channel_map_equal(const pa_channel_map *a, const pa_channel_map *b) { + unsigned c; + + assert(a); + assert(b); + + if (a->channels != b->channels) + return 0; + + for (c = 0; c < a->channels; c++) + if (a->map[c] != b->map[c]) + return 0; + + return 1; +} + +char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map) { + unsigned channel; + int first = 1; + char *e; + + assert(s); + assert(l > 0); + assert(map); + + *(e = s) = 0; + + for (channel = 0; channel < map->channels && l > 1; channel++) { + l -= snprintf(e, l, "%s%u:%s", + first ? "" : " ", + channel, + pa_channel_position_to_string(map->map[channel])); + + e = strchr(e, 0); + first = 0; + } + + return s; +} + +int pa_channel_map_valid(const pa_channel_map *map) { + unsigned c; + + assert(map); + + if (map->channels <= 0 || map->channels > PA_CHANNELS_MAX) + return 0; + + for (c = 0; c < map->channels; c++) + if (map->map[c] < 0 ||map->map[c] >= PA_CHANNEL_POSITION_MAX) + return 0; + + return 1; +} |