mirrors/pulseaudio
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git synced 2025-11-01 22:58:47 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

add new API function pa_cvolume_remap()

Browse source
This commit is contained in:
Lennart Poettering 2008-08-04 18:40:53 +02:00
parent cd5afb80f7
commit 5880516076
2 changed files with 89 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

85
src/pulse/volume.c
View file

@ -176,3 +176,88 @@ int pa_cvolume_valid(const pa_cvolume *v) {
return 1;
}
static pa_bool_t on_left(pa_channel_position_t p) {
return
p == PA_CHANNEL_POSITION_FRONT_LEFT ||
p == PA_CHANNEL_POSITION_REAR_LEFT ||
p == PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER ||
p == PA_CHANNEL_POSITION_SIDE_LEFT ||
p == PA_CHANNEL_POSITION_TOP_FRONT_LEFT ||
p == PA_CHANNEL_POSITION_TOP_REAR_LEFT;
}
static pa_bool_t on_right(pa_channel_position_t p) {
return
p == PA_CHANNEL_POSITION_FRONT_RIGHT ||
p == PA_CHANNEL_POSITION_REAR_RIGHT ||
p == PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER ||
p == PA_CHANNEL_POSITION_SIDE_RIGHT ||
p == PA_CHANNEL_POSITION_TOP_FRONT_RIGHT ||
p == PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
}
static pa_bool_t on_center(pa_channel_position_t p) {
return
p == PA_CHANNEL_POSITION_FRONT_CENTER ||
p == PA_CHANNEL_POSITION_REAR_CENTER ||
p == PA_CHANNEL_POSITION_TOP_CENTER ||
p == PA_CHANNEL_POSITION_TOP_FRONT_CENTER ||
p == PA_CHANNEL_POSITION_TOP_REAR_CENTER;
}
static pa_bool_t on_lfe(pa_channel_position_t p) {
return
p == PA_CHANNEL_POSITION_LFE;
}
pa_cvolume *pa_cvolume_remap(pa_cvolume *v, pa_channel_map *from, pa_channel_map *to) {
int a, b;
pa_cvolume result;
pa_assert(v);
pa_assert(from);
pa_assert(to);
pa_assert(v->channels == from->channels);
if (pa_channel_map_equal(from, to))
return v;
result.channels = to->channels;
for (b = 0; b < to->channels; b++) {
pa_volume_t k = 0;
int n = 0;
for (a = 0; a < from->channels; a++)
if (from->map[a] == to->map[b]) {
k += v->values[a];
n ++;
}
if (n <= 0) {
for (a = 0; a < from->channels; a++)
if ((on_left(from->map[a]) && on_left(to->map[b])) ||
(on_right(from->map[a]) && on_right(to->map[b])) ||
(on_center(from->map[a]) && on_center(to->map[b])) ||
(on_lfe(from->map[a]) && on_lfe(to->map[b]))) {
k += v->values[a];
n ++;
}
}
if (n <= 0)
k = pa_cvolume_avg(v);
else
k /= n;
result.values[b] = k;
}
*v = result;
return v;
}

4
src/pulse/volume.h
View file

@ -28,6 +28,7 @@
#include <pulse/cdecl.h>
#include <pulse/gccmacro.h>
#include <pulse/sample.h>
#include <pulse/channelmap.h>
/** \page volume Volume Control
*
@ -170,6 +171,9 @@ double pa_sw_volume_to_linear(pa_volume_t v) PA_GCC_CONST;
#define PA_DECIBEL_MININFTY ((double) -200.0)
#endif
/** Remap a volume from one channel mapping to a different channel mapping. \since 0.9.12 */
pa_cvolume *pa_cvolume_remap(pa_cvolume *v, pa_channel_map *from, pa_channel_map *to);
PA_C_DECL_END
#endif