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volume: introduce pa_cvolume_min() and pa_cvolume_min_mask()

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This commit is contained in:
Lennart Poettering 2009-08-19 00:56:16 +02:00
parent 8f928b2e57
commit d634555a3e
3 changed files with 51 additions and 2 deletions
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41
src/pulse/volume.c
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@ -126,7 +126,7 @@ pa_volume_t pa_cvolume_avg_mask(const pa_cvolume *a, const pa_channel_map *cm, p
}
pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
pa_volume_t m = 0;
pa_volume_t m = PA_VOLUME_MUTED;
unsigned c;
pa_assert(a);
@ -139,8 +139,22 @@ pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
return m;
}
pa_volume_t pa_cvolume_min(const pa_cvolume *a) {
pa_volume_t m = (pa_volume_t) -1;
unsigned c;
pa_assert(a);
pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
for (c = 0; c < a->channels; c++)
if (m == (pa_volume_t) -1 || 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;
pa_volume_t m = PA_VOLUME_MUTED;
unsigned c, n;
pa_assert(a);
@ -162,6 +176,29 @@ pa_volume_t pa_cvolume_max_mask(const pa_cvolume *a, const pa_channel_map *cm, p
return m;
}
pa_volume_t pa_cvolume_min_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
pa_volume_t m = (pa_volume_t) -1;
unsigned c, n;
pa_assert(a);
if (!cm)
return pa_cvolume_min(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 (m == (pa_volume_t) -1 || a->values[c] < m)
m = a->values[c];
}
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));
}