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add new function pa_alsa_volume_divide()

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This commit is contained in:
Lennart Poettering 2008-08-13 13:54:17 +02:00
parent 8ab85fdf9e
commit 29daef7a26
2 changed files with 27 additions and 0 deletions
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24
src/modules/alsa-util.c
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@ -1117,3 +1117,27 @@ pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) {
return item;
}
pa_cvolume *pa_alsa_volume_divide(pa_cvolume *r, const pa_cvolume *t) {
unsigned i;
pa_assert(r);
pa_assert(t);
pa_assert(r->channels == t->channels);
for (i = 0; i < r->channels; i++) {
double a, b, c;
a = pa_sw_volume_to_linear(r->values[i]); /* the hw volume */
b = pa_sw_volume_to_linear(t->values[i]); /* the intended volume */
if (a <= 0)
c = 0;
else
c = b / a;
r->values[i] = pa_sw_volume_from_linear(c);
}
return r;
}

3
src/modules/alsa-util.h
View file

@ -26,6 +26,7 @@
#include <asoundlib.h>
#include <pulse/sample.h>
#include <pulse/volume.h>
#include <pulse/mainloop-api.h>
#include <pulse/channelmap.h>
#include <pulse/proplist.h>
@ -94,4 +95,6 @@ int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents);
pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll);
pa_cvolume *pa_alsa_volume_divide(pa_cvolume *r, const pa_cvolume *t);
#endif