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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include "volume.h"
int pa_cvolume_equal(const struct pa_cvolume *a, const struct pa_cvolume *b) {
int i;
assert(a);
assert(b);
if (a->channels != b->channels)
return 0;
for (i = 0; i < a->channels; i++)
if (a->values[i] != b->values[i])
return 0;
return 1;
}
void pa_cvolume_set(struct pa_cvolume *a, pa_volume_t v) {
int i;
assert(a);
a->channels = PA_CHANNELS_MAX;
for (i = 0; i < a->channels; i++)
a->values[i] = v;
}
void pa_cvolume_reset(struct pa_cvolume *a) {
assert(a);
pa_cvolume_set(a, PA_VOLUME_NORM);
}
void pa_cvolume_mute(struct pa_cvolume *a) {
assert(a);
pa_cvolume_set(a, PA_VOLUME_MUTED);
}
pa_volume_t pa_cvolume_avg(const struct pa_cvolume *a) {
uint64_t sum = 0;
int i;
assert(a);
for (i = 0; i < a->channels; i++)
sum += a->values[i];
sum /= a->channels;
return (pa_volume_t) sum;
}
pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
uint64_t p = a;
p *= b;
p /= PA_VOLUME_NORM;
return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a)* pa_sw_volume_to_linear(b));
}
#define USER_DECIBEL_RANGE 30
pa_volume_t pa_sw_volume_from_dB(double dB) {
if (dB <= -USER_DECIBEL_RANGE)
return PA_VOLUME_MUTED;
return (pa_volume_t) ((dB/USER_DECIBEL_RANGE+1)*PA_VOLUME_NORM);
}
double pa_sw_volume_to_dB(pa_volume_t v) {
if (v == PA_VOLUME_MUTED)
return PA_DECIBEL_MININFTY;
return ((double) v/PA_VOLUME_NORM-1)*USER_DECIBEL_RANGE;
}
pa_volume_t pa_sw_volume_from_linear(double v) {
if (v <= 0)
return PA_VOLUME_MUTED;
if (v == 1)
return PA_VOLUME_NORM;
return pa_sw_volume_from_dB(20*log10(v));
}
double pa_sw_volume_to_linear(pa_volume_t v) {
if (v == PA_VOLUME_MUTED)
return 0;
return pow(10, pa_sw_volume_to_dB(v)/20);
}
char *pa_cvolume_snprintf(char *s, size_t l, const struct pa_cvolume *c, unsigned channels) {
unsigned c;
int first = 1;
assert(s);
assert(l > 0);
assert(c);
if (channels > PA_CHANNELS_MAX || channels <= 0)
channels = PA_CHANNELS_MAX;
*s = 0;
for (c = 0; c < channels && l > 1; c++) {
l -= snprintf(s, l, "%s%u: %3u%%",
first ? "" : " ",
c,
(c->channels[c]*100)/PA_VOLUME_NORM);
s = strchr(s, 0);
}
return s;
}
/** Return non-zero if the volume of all channels is equal to the specified value */
int pa_cvolume_channels_equal_to(const struct pa_cvolume *a, uint8_t channels, pa_volume_t v) {
unsigned c;
assert(a);
if (channels > PA_CHANNELS_MAX)
channels = PA_CHANNELS_MAX;
for (c = 0; c < channels; c++)
if (a->map[c] != v)
return 0;
return 1;
}
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