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volume: implement pa_cvolume_{scale|max|avg}_mask()

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This commit is contained in:
Lennart Poettering 2009-05-25 23:55:44 +02:00
parent 5f2d848d8e
commit 8b180b6368
3 changed files with 102 additions and 12 deletions
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89
src/pulse/volume.c
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@ -80,29 +80,78 @@ pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
uint64_t sum = 0;
int i;
unsigned c;
pa_assert(a);
pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
for (i = 0; i < a->channels; i++)
sum += a->values[i];
for (c = 0; c < a->channels; c++)
sum += a->values[c];
sum /= a->channels;
return (pa_volume_t) sum;
}
pa_volume_t pa_cvolume_avg_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
uint64_t sum = 0;
unsigned c, n;
pa_assert(a);
if (!cm)
return pa_cvolume_avg(a);
pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
for (c = n = 0; c < a->channels; c++) {
if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
continue;
sum += a->values[c];
n ++;
}
if (n > 0)
sum /= n;
return (pa_volume_t) sum;
}
pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
pa_volume_t m = 0;
int i;
unsigned c;
pa_assert(a);
pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
for (i = 0; i < a->channels; i++)
if (a->values[i] > m)
m = a->values[i];
for (c = 0; c < a->channels; c++)
if (a->values[c] > m)
m = a->values[c];
return m;
}
pa_volume_t pa_cvolume_max_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
pa_volume_t m = 0;
unsigned c, n;
pa_assert(a);
if (!cm)
return pa_cvolume_max(a);
pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
for (c = n = 0; c < a->channels; c++) {
if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
continue;
if (a->values[c] > m)
m = a->values[c];
}
return m;
}
@ -590,11 +639,29 @@ pa_cvolume* pa_cvolume_scale(pa_cvolume *v, pa_volume_t max) {
pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
pa_return_val_if_fail(max != (pa_volume_t) -1, NULL);
for (c = 0; c < v->channels; c++)
if (v->values[c] > t)
t = v->values[c];
t = pa_cvolume_max(v);
if (t <= 0)
if (t <= PA_VOLUME_MUTED)
return pa_cvolume_set(v, v->channels, max);
for (c = 0; c < v->channels; c++)
v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
return v;
}
pa_cvolume* pa_cvolume_scale_mask(pa_cvolume *v, pa_volume_t max, pa_channel_map *cm, pa_channel_position_mask_t mask) {
unsigned c;
pa_volume_t t = 0;
pa_assert(v);
pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
pa_return_val_if_fail(max != (pa_volume_t) -1, NULL);
t = pa_cvolume_max_mask(v, cm, mask);
if (t <= PA_VOLUME_MUTED)
return pa_cvolume_set(v, v->channels, max);
for (c = 0; c < v->channels; c++)