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volume: introduce pa_cvolume_{inc|dec}()

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This commit is contained in:
Lennart Poettering 2009-08-19 02:32:36 +02:00
parent 1421eff0b6
commit cfef930036
3 changed files with 44 additions and 0 deletions
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34
src/pulse/volume.c
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@ -876,3 +876,37 @@ pa_cvolume* pa_cvolume_merge(pa_cvolume *dest, const pa_cvolume *a, const pa_cvo
return dest;
}
pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc) {
pa_volume_t m;
pa_assert(v);
pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
m = pa_cvolume_max(v);
if (m >= PA_VOLUME_MAX - inc)
m = PA_VOLUME_MAX;
else
m += inc;
return pa_cvolume_scale(v, m);
}
pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec) {
pa_volume_t m;
pa_assert(v);
pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
m = pa_cvolume_max(v);
if (m <= PA_VOLUME_MUTED + dec)
m = PA_VOLUME_MUTED;
else
m -= dec;
return pa_cvolume_scale(v, m);
}