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reduce number of conversions to/from linear volumes

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This commit is contained in:
Lennart Poettering 2009-04-07 04:04:19 +02:00
parent d612fbb802
commit 02686cce6d
1 changed files with 13 additions and 2 deletions
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15
src/pulsecore/sink.c
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@ -1027,13 +1027,24 @@ void pa_sink_update_flat_volume(pa_sink *s, pa_cvolume *new_volume) {
* to this sink */
for (i = PA_SINK_INPUT(pa_idxset_first(s->inputs, &idx)); i; i = PA_SINK_INPUT(pa_idxset_next(s->inputs, &idx))) {
pa_cvolume remapped_new_volume;
unsigned c;
/* This basically calculates i->soft_volume := i->virtual_volume / new_volume * i->volume_factor */
remapped_new_volume = *new_volume;
pa_cvolume_remap(&remapped_new_volume, &s->channel_map, &i->channel_map);
pa_sw_cvolume_divide(&i->soft_volume, &i->virtual_volume, &remapped_new_volume);
pa_sw_cvolume_multiply(&i->soft_volume, &i->soft_volume, &i->volume_factor);
for (c = 0; c < i->sample_spec.channels; c++)
if (remapped_new_volume.values[c] <= PA_VOLUME_MUTED)
i->soft_volume.values[c] = PA_VOLUME_MUTED;
else
i->soft_volume.values[c] = pa_sw_volume_from_linear(
pa_sw_volume_to_linear(i->virtual_volume.values[c]) *
pa_sw_volume_to_linear(i->volume_factor.values[c]) /
pa_sw_volume_to_linear(remapped_new_volume.values[c]));
i->soft_volume.channels = i->sample_spec.channels;
/* Hooks have the ability to play games with i->soft_volume */
pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_INPUT_SET_VOLUME], i);