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implement pa_cvolume_{get|set}_fade

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This commit is contained in:
Lennart Poettering 2009-01-30 00:15:40 +01:00
parent 9314db79db
commit 1b53f8297f
3 changed files with 130 additions and 2 deletions
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111
src/pulse/volume.c
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@ -341,6 +341,28 @@ static pa_bool_t on_lfe(pa_channel_position_t p) {
p == PA_CHANNEL_POSITION_LFE;
}
static pa_bool_t on_front(pa_channel_position_t p) {
return
p == PA_CHANNEL_POSITION_FRONT_LEFT ||
p == PA_CHANNEL_POSITION_FRONT_RIGHT ||
p == PA_CHANNEL_POSITION_FRONT_CENTER ||
p == PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER ||
p == PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER ||
p == PA_CHANNEL_POSITION_TOP_FRONT_LEFT ||
p == PA_CHANNEL_POSITION_TOP_FRONT_RIGHT ||
p == PA_CHANNEL_POSITION_TOP_FRONT_CENTER;
}
static pa_bool_t on_rear(pa_channel_position_t p) {
return
p == PA_CHANNEL_POSITION_REAR_LEFT ||
p == PA_CHANNEL_POSITION_REAR_RIGHT ||
p == PA_CHANNEL_POSITION_REAR_CENTER ||
p == PA_CHANNEL_POSITION_TOP_REAR_LEFT ||
p == PA_CHANNEL_POSITION_TOP_REAR_RIGHT ||
p == PA_CHANNEL_POSITION_TOP_REAR_CENTER;
}
pa_cvolume *pa_cvolume_remap(pa_cvolume *v, const pa_channel_map *from, const pa_channel_map *to) {
int a, b;
pa_cvolume result;
@ -519,3 +541,92 @@ pa_cvolume* pa_cvolume_scale(pa_cvolume *v, pa_volume_t max) {
return v;
}
static void get_avg_fr(const pa_channel_map *map, const pa_cvolume *v, pa_volume_t *f, pa_volume_t *r) {
int c;
pa_volume_t front = 0, rear = 0;
unsigned n_front = 0, n_rear = 0;
pa_assert(v);
pa_assert(map);
pa_assert(map->channels == v->channels);
pa_assert(f);
pa_assert(r);
for (c = 0; c < map->channels; c++) {
if (on_front(map->map[c])) {
front += v->values[c];
n_front++;
} else if (on_rear(map->map[c])) {
rear += v->values[c];
n_rear++;
}
}
if (n_front <= 0)
*f = PA_VOLUME_NORM;
else
*f = front / n_front;
if (n_rear <= 0)
*r = PA_VOLUME_NORM;
else
*r = rear / n_rear;
}
float pa_cvolume_get_fade(const pa_cvolume *v, const pa_channel_map *map) {
pa_volume_t front, rear;
pa_assert(v);
pa_assert(map);
pa_assert(map->channels == v->channels);
get_avg_fr(map, v, &front, &rear);
if (front == rear)
return 0.0f;
if (rear > front)
return -1.0f + ((float) front / (float) rear);
else
return 1.0f - ((float) rear / (float) front);
}
pa_cvolume* pa_cvolume_set_fade(pa_cvolume *v, const pa_channel_map *map, float new_fade) {
pa_volume_t front, nfront, rear, nrear, m;
unsigned c;
pa_assert(map->channels == v->channels);
pa_assert(map);
pa_assert(v);
pa_assert(new_fade >= -1.0f);
pa_assert(new_fade <= 1.0f);
get_avg_fr(map, v, &front, &rear);
m = PA_MAX(front, rear);
if (new_fade <= 0) {
nfront = (new_fade + 1.0f) * m;
nrear = m;
} else {
nrear = (1.0f - new_fade) * m;
nfront = m;
}
for (c = 0; c < map->channels; c++) {
if (on_front(map->map[c])) {
if (front == 0)
v->values[c] = nfront;
else
v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) nfront) / (uint64_t) front);
} else if (on_rear(map->map[c])) {
if (rear == 0)
v->values[c] = nrear;
else
v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) nrear) / (uint64_t) rear);
}
}
return v;
}