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Diffstat (limited to 'src/pulse/volume.c')
-rw-r--r--src/pulse/volume.c101
1 files changed, 99 insertions, 2 deletions
diff --git a/src/pulse/volume.c b/src/pulse/volume.c
index 70d6f86a..768bf49c 100644
--- a/src/pulse/volume.c
+++ b/src/pulse/volume.c
@@ -53,7 +53,7 @@ pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
pa_assert(channels > 0);
pa_assert(channels <= PA_CHANNELS_MAX);
- a->channels = channels;
+ a->channels = (uint8_t) channels;
for (i = 0; i < a->channels; i++)
a->values[i] = v;
@@ -74,6 +74,18 @@ pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
return (pa_volume_t) sum;
}
+pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
+ pa_volume_t m = 0;
+ int i;
+ pa_assert(a);
+
+ for (i = 0; i < a->channels; i++)
+ if (a->values[i] > m)
+ m = a->values[i];
+
+ return m;
+}
+
pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a)* pa_sw_volume_to_linear(b));
}
@@ -163,7 +175,7 @@ pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const
i < b->channels ? b->values[i] : PA_VOLUME_NORM);
}
- dest->channels = i;
+ dest->channels = (uint8_t) i;
return dest;
}
@@ -176,3 +188,88 @@ 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;
+}