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pipewire/spa/plugins/alsa/acp/channelmap.h
Sam James b943c31fd8
*: don't include standard C headers inside of extern "C" 
Including C headers inside of `extern "C"` breaks use from C++. Hoist
the includes of standard C headers above the block so we don't try
to mangle the stdlib.

I initially tried to scope this with a targeted change but it's too
hard to do correctly that way. This way, we avoid whack-a-mole.

Firefox is working around this in their e21461b7b8b39cc31ba53c47d4f6f310c673ff2f
commit.

Bug: https://bugzilla.mozilla.org/1953080
2025-05-30 09:48:28 +01:00

476 lines
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C
Raw Blame History

/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio 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 2.1 of the License,
or (at your option) any later version.
PulseAudio 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 PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifndef PULSE_CHANNELMAP_H
#define PULSE_CHANNELMAP_H
#include "spa/utils/defs.h"
#ifdef __cplusplus
extern "C" {
#endif
#define PA_CHANNELS_MAX 64
#define PA_CHANNEL_MAP_SNPRINT_MAX (PA_CHANNELS_MAX * 32)
typedef enum pa_channel_map_def {
PA_CHANNEL_MAP_AIFF,
PA_CHANNEL_MAP_ALSA,
PA_CHANNEL_MAP_AUX,
PA_CHANNEL_MAP_WAVEEX,
PA_CHANNEL_MAP_OSS,
PA_CHANNEL_MAP_DEF_MAX,
PA_CHANNEL_MAP_DEFAULT = PA_CHANNEL_MAP_AIFF
} pa_channel_map_def_t;
typedef enum pa_channel_position {
PA_CHANNEL_POSITION_INVALID = -1,
PA_CHANNEL_POSITION_MONO = 0,
PA_CHANNEL_POSITION_FRONT_LEFT, /**< Apple, Dolby call this 'Left' */
PA_CHANNEL_POSITION_FRONT_RIGHT, /**< Apple, Dolby call this 'Right' */
PA_CHANNEL_POSITION_FRONT_CENTER, /**< Apple, Dolby call this 'Center' */
/** \cond fulldocs */
PA_CHANNEL_POSITION_LEFT = PA_CHANNEL_POSITION_FRONT_LEFT,
PA_CHANNEL_POSITION_RIGHT = PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_CENTER = PA_CHANNEL_POSITION_FRONT_CENTER,
/** \endcond */
PA_CHANNEL_POSITION_REAR_CENTER, /**< Microsoft calls this 'Back Center', Apple calls this 'Center Surround', Dolby calls this 'Surround Rear Center' */
PA_CHANNEL_POSITION_REAR_LEFT, /**< Microsoft calls this 'Back Left', Apple calls this 'Left Surround' (!), Dolby calls this 'Surround Rear Left' */
PA_CHANNEL_POSITION_REAR_RIGHT, /**< Microsoft calls this 'Back Right', Apple calls this 'Right Surround' (!), Dolby calls this 'Surround Rear Right' */
PA_CHANNEL_POSITION_LFE, /**< Microsoft calls this 'Low Frequency', Apple calls this 'LFEScreen' */
/** \cond fulldocs */
PA_CHANNEL_POSITION_SUBWOOFER = PA_CHANNEL_POSITION_LFE,
/** \endcond */
PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER, /**< Apple, Dolby call this 'Left Center' */
PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER, /**< Apple, Dolby call this 'Right Center */
PA_CHANNEL_POSITION_SIDE_LEFT, /**< Apple calls this 'Left Surround Direct', Dolby calls this 'Surround Left' (!) */
PA_CHANNEL_POSITION_SIDE_RIGHT, /**< Apple calls this 'Right Surround Direct', Dolby calls this 'Surround Right' (!) */
PA_CHANNEL_POSITION_AUX0,
PA_CHANNEL_POSITION_AUX1,
PA_CHANNEL_POSITION_AUX2,
PA_CHANNEL_POSITION_AUX3,
PA_CHANNEL_POSITION_AUX4,
PA_CHANNEL_POSITION_AUX5,
PA_CHANNEL_POSITION_AUX6,
PA_CHANNEL_POSITION_AUX7,
PA_CHANNEL_POSITION_AUX8,
PA_CHANNEL_POSITION_AUX9,
PA_CHANNEL_POSITION_AUX10,
PA_CHANNEL_POSITION_AUX11,
PA_CHANNEL_POSITION_AUX12,
PA_CHANNEL_POSITION_AUX13,
PA_CHANNEL_POSITION_AUX14,
PA_CHANNEL_POSITION_AUX15,
PA_CHANNEL_POSITION_AUX16,
PA_CHANNEL_POSITION_AUX17,
PA_CHANNEL_POSITION_AUX18,
PA_CHANNEL_POSITION_AUX19,
PA_CHANNEL_POSITION_AUX20,
PA_CHANNEL_POSITION_AUX21,
PA_CHANNEL_POSITION_AUX22,
PA_CHANNEL_POSITION_AUX23,
PA_CHANNEL_POSITION_AUX24,
PA_CHANNEL_POSITION_AUX25,
PA_CHANNEL_POSITION_AUX26,
PA_CHANNEL_POSITION_AUX27,
PA_CHANNEL_POSITION_AUX28,
PA_CHANNEL_POSITION_AUX29,
PA_CHANNEL_POSITION_AUX30,
PA_CHANNEL_POSITION_AUX31,
PA_CHANNEL_POSITION_TOP_CENTER, /**< Apple calls this 'Top Center Surround' */
PA_CHANNEL_POSITION_TOP_FRONT_LEFT, /**< Apple calls this 'Vertical Height Left' */
PA_CHANNEL_POSITION_TOP_FRONT_RIGHT, /**< Apple calls this 'Vertical Height Right' */
PA_CHANNEL_POSITION_TOP_FRONT_CENTER, /**< Apple calls this 'Vertical Height Center' */
PA_CHANNEL_POSITION_TOP_REAR_LEFT, /**< Microsoft and Apple call this 'Top Back Left' */
PA_CHANNEL_POSITION_TOP_REAR_RIGHT, /**< Microsoft and Apple call this 'Top Back Right' */
PA_CHANNEL_POSITION_TOP_REAR_CENTER, /**< Microsoft and Apple call this 'Top Back Center' */
PA_CHANNEL_POSITION_MAX
} pa_channel_position_t;
typedef struct pa_channel_map {
uint8_t channels;
pa_channel_position_t map[PA_CHANNELS_MAX];
} pa_channel_map;
static inline int pa_channels_valid(uint8_t channels)
{
return channels > 0 && channels <= PA_CHANNELS_MAX;
}
static inline int pa_channel_map_valid(const pa_channel_map *map)
{
unsigned c;
if (!pa_channels_valid(map->channels))
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;
}
static inline pa_channel_map* pa_channel_map_init(pa_channel_map *m)
{
unsigned c;
m->channels = 0;
for (c = 0; c < PA_CHANNELS_MAX; c++)
m->map[c] = PA_CHANNEL_POSITION_INVALID;
return m;
}
static inline pa_channel_map* pa_channel_map_init_auto(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def)
{
unsigned i;
pa_assert(m);
pa_assert(pa_channels_valid(channels));
pa_assert(def < PA_CHANNEL_MAP_DEF_MAX);
pa_channel_map_init(m);
m->channels = (uint8_t) channels;
switch (def) {
case PA_CHANNEL_MAP_ALSA:
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;
SPA_FALLTHROUGH;
case 6:
m->map[5] = PA_CHANNEL_POSITION_LFE;
SPA_FALLTHROUGH;
case 5:
m->map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
SPA_FALLTHROUGH;
case 4:
m->map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
m->map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
SPA_FALLTHROUGH;
case 2:
m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
return m;
default:
return NULL;
}
case PA_CHANNEL_MAP_AUX:
for (i = 0; i < channels; i++)
m->map[i] = PA_CHANNEL_POSITION_AUX0 + (i & 31);
return m;
default:
break;
}
return NULL;
}
static inline pa_channel_map* pa_channel_map_init_extend(pa_channel_map *m,
unsigned channels, pa_channel_map_def_t def)
{
pa_channel_map *r;
if ((r = pa_channel_map_init_auto(m, channels, def)) != NULL)
return r;
return pa_channel_map_init_auto(m, channels, PA_CHANNEL_MAP_AUX);
}
typedef uint64_t pa_channel_position_mask_t;
#define PA_CHANNEL_POSITION_MASK(f) ((pa_channel_position_mask_t) (1ULL << (f)))
#define PA_CHANNEL_POSITION_MASK_LEFT \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_REAR_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_SIDE_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_LEFT)) \
#define PA_CHANNEL_POSITION_MASK_RIGHT \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_REAR_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_SIDE_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_RIGHT))
#define PA_CHANNEL_POSITION_MASK_CENTER \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_REAR_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_CENTER))
#define PA_CHANNEL_POSITION_MASK_FRONT \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_CENTER))
#define PA_CHANNEL_POSITION_MASK_REAR \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_REAR_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_REAR_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_REAR_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_CENTER))
#define PA_CHANNEL_POSITION_MASK_LFE \
PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_LFE)
#define PA_CHANNEL_POSITION_MASK_HFE \
(PA_CHANNEL_POSITION_MASK_REAR | PA_CHANNEL_POSITION_MASK_FRONT \
| PA_CHANNEL_POSITION_MASK_LEFT | PA_CHANNEL_POSITION_MASK_RIGHT \
| PA_CHANNEL_POSITION_MASK_CENTER)
#define PA_CHANNEL_POSITION_MASK_SIDE_OR_TOP_CENTER \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_SIDE_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_SIDE_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_CENTER))
#define PA_CHANNEL_POSITION_MASK_TOP \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_FRONT_CENTER) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_CENTER))
#define PA_CHANNEL_POSITION_MASK_ALL \
((pa_channel_position_mask_t) (PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_MAX)-1))
static const char *const pa_position_table[PA_CHANNEL_POSITION_MAX] = {
[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_AUX0] = "aux0",
[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",
[PA_CHANNEL_POSITION_AUX13] = "aux13",
[PA_CHANNEL_POSITION_AUX14] = "aux14",
[PA_CHANNEL_POSITION_AUX15] = "aux15",
[PA_CHANNEL_POSITION_AUX16] = "aux16",
[PA_CHANNEL_POSITION_AUX17] = "aux17",
[PA_CHANNEL_POSITION_AUX18] = "aux18",
[PA_CHANNEL_POSITION_AUX19] = "aux19",
[PA_CHANNEL_POSITION_AUX20] = "aux20",
[PA_CHANNEL_POSITION_AUX21] = "aux21",
[PA_CHANNEL_POSITION_AUX22] = "aux22",
[PA_CHANNEL_POSITION_AUX23] = "aux23",
[PA_CHANNEL_POSITION_AUX24] = "aux24",
[PA_CHANNEL_POSITION_AUX25] = "aux25",
[PA_CHANNEL_POSITION_AUX26] = "aux26",
[PA_CHANNEL_POSITION_AUX27] = "aux27",
[PA_CHANNEL_POSITION_AUX28] = "aux28",
[PA_CHANNEL_POSITION_AUX29] = "aux29",
[PA_CHANNEL_POSITION_AUX30] = "aux30",
[PA_CHANNEL_POSITION_AUX31] = "aux31",
[PA_CHANNEL_POSITION_TOP_CENTER] = "top-center",
[PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = "top-front-center",
[PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = "top-front-left",
[PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = "top-front-right",
[PA_CHANNEL_POSITION_TOP_REAR_CENTER] = "top-rear-center",
[PA_CHANNEL_POSITION_TOP_REAR_LEFT] = "top-rear-left",
[PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = "top-rear-right"
};
static inline pa_channel_position_t pa_channel_position_from_string(const char *p)
{
pa_channel_position_t i;
/* Some special aliases */
if (pa_streq(p, "left"))
return PA_CHANNEL_POSITION_LEFT;
else if (pa_streq(p, "right"))
return PA_CHANNEL_POSITION_RIGHT;
else if (pa_streq(p, "center"))
return PA_CHANNEL_POSITION_CENTER;
else if (pa_streq(p, "subwoofer"))
return PA_CHANNEL_POSITION_SUBWOOFER;
for (i = 0; i < PA_CHANNEL_POSITION_MAX; i++)
if (pa_streq(p, pa_position_table[i]))
return i;
return PA_CHANNEL_POSITION_INVALID;
}
static inline pa_channel_map *pa_channel_map_parse(pa_channel_map *rmap, const char *s)
{
const char *state;
pa_channel_map map;
char *p;
pa_channel_map_init(&map);
if (pa_streq(s, "stereo")) {
map.channels = 2;
map.map[0] = PA_CHANNEL_POSITION_LEFT;
map.map[1] = PA_CHANNEL_POSITION_RIGHT;
goto finish;
} else if (pa_streq(s, "surround-21")) {
map.channels = 3;
map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
map.map[2] = PA_CHANNEL_POSITION_LFE;
goto finish;
} else if (pa_streq(s, "surround-40")) {
map.channels = 4;
map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
goto finish;
} else if (pa_streq(s, "surround-41")) {
map.channels = 5;
map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
map.map[4] = PA_CHANNEL_POSITION_LFE;
goto finish;
} else if (pa_streq(s, "surround-50")) {
map.channels = 5;
map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
goto finish;
} else if (pa_streq(s, "surround-51")) {
map.channels = 6;
map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
map.map[5] = PA_CHANNEL_POSITION_LFE;
goto finish;
} else if (pa_streq(s, "surround-71")) {
map.channels = 8;
map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
map.map[5] = PA_CHANNEL_POSITION_LFE;
map.map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
map.map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
goto finish;
}
state = NULL;
map.channels = 0;
while ((p = pa_split(s, ",", &state))) {
pa_channel_position_t f;
if (map.channels >= PA_CHANNELS_MAX) {
pa_xfree(p);
return NULL;
}
if ((f = pa_channel_position_from_string(p)) == PA_CHANNEL_POSITION_INVALID) {
pa_xfree(p);
return NULL;
}
map.map[map.channels++] = f;
pa_xfree(p);
}
finish:
if (!pa_channel_map_valid(&map))
return NULL;
*rmap = map;
return rmap;
}
static inline const char* pa_channel_position_to_string(pa_channel_position_t pos) {
if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
return NULL;
return pa_position_table[pos];
}
static inline int pa_channel_map_equal(const pa_channel_map *a, const pa_channel_map *b)
{
unsigned c;
if (PA_UNLIKELY(a == b))
return 1;
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;
}
static inline char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map) {
unsigned channel;
bool first = true;
char *e;
if (!pa_channel_map_valid(map)) {
pa_snprintf(s, l, "%s", _("(invalid)"));
return s;
}
*(e = s) = 0;
for (channel = 0; channel < map->channels && l > 1; channel++) {
l -= pa_snprintf(e, l, "%s%s",
first ? "" : ",",
pa_channel_position_to_string(map->map[channel]));
e = strchr(e, 0);
first = false;
}
return s;
}
#ifdef __cplusplus
}
#endif
#endif /* PULSE_CHANNELMAP_H */
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