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implement pa_sw_volume_divide() and pa_sw_cvolume_divide()

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This commit is contained in:
Lennart Poettering 2008-10-04 01:40:41 +02:00
parent 87c8132ce3
commit da4ad5ed01
2 changed files with 40 additions and 7 deletions
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30
src/pulse/volume.c
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@ -104,6 +104,15 @@ 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));
}
pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
double v = pa_sw_volume_to_linear(b);
if (v <= 0)
return 0;
return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) / v);
}
#define USER_DECIBEL_RANGE 60
pa_volume_t pa_sw_volume_from_dB(double dB) {
@ -220,12 +229,23 @@ pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const
pa_assert(a);
pa_assert(b);
for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++) {
for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]);
dest->values[i] = pa_sw_volume_multiply(
i < a->channels ? a->values[i] : PA_VOLUME_NORM,
i < b->channels ? b->values[i] : PA_VOLUME_NORM);
}
dest->channels = (uint8_t) i;
return dest;
}
pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
unsigned i;
pa_assert(dest);
pa_assert(a);
pa_assert(b);
for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]);
dest->channels = (uint8_t) i;