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add user volume API

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@255 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-10-24 00:48:02 +00:00
parent a6471e2602
commit da45617efc
6 changed files with 45 additions and 2 deletions
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16
polyp/sample.c
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@ -125,6 +125,22 @@ double pa_volume_to_dB(pa_volume_t v) {
return 20*log10((double) v/PA_VOLUME_NORM);
}
#define USER_DECIBEL_RANGE 30
double pa_volume_to_user(pa_volume_t v) {
double dB = pa_volume_to_dB(v);
return dB < -USER_DECIBEL_RANGE ? 0 : dB/USER_DECIBEL_RANGE+1;
}
pa_volume_t pa_volume_from_user(double v) {
if (v <= 0)
return PA_VOLUME_MUTED;
return pa_volume_from_dB((v-1)*USER_DECIBEL_RANGE);
}
void pa_bytes_snprint(char *s, size_t l, unsigned v) {
if (v >= ((unsigned) 1024)*1024*1024)
snprintf(s, l, "%0.1f GB", ((double) v)/1024/1024/1024);