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-rw-r--r--src/pulse/volume.c85
-rw-r--r--src/pulse/volume.h4
2 files changed, 89 insertions, 0 deletions
diff --git a/src/pulse/volume.c b/src/pulse/volume.c
index 70d6f86a..625eb19a 100644
--- a/src/pulse/volume.c
+++ b/src/pulse/volume.c
@@ -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;
+}
diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index 3befb1da..4fdbf658 100644
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -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