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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 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 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 <stdio.h>
#include <assert.h>
#include <math.h>
#include "sample.h"
size_t pa_frame_size(const struct pa_sample_spec *spec) {
size_t b = 1;
assert(spec);
switch (spec->format) {
case PA_SAMPLE_U8:
case PA_SAMPLE_ULAW:
case PA_SAMPLE_ALAW:
b = 1;
break;
case PA_SAMPLE_S16LE:
case PA_SAMPLE_S16BE:
b = 2;
break;
case PA_SAMPLE_FLOAT32LE:
case PA_SAMPLE_FLOAT32BE:
b = 4;
break;
default:
assert(0);
}
return b * spec->channels;
}
size_t pa_bytes_per_second(const struct pa_sample_spec *spec) {
assert(spec);
return spec->rate*pa_frame_size(spec);
}
uint32_t pa_bytes_to_usec(size_t length, const struct pa_sample_spec *spec) {
assert(spec);
return (uint32_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
}
int pa_sample_spec_valid(const struct pa_sample_spec *spec) {
assert(spec);
if (!spec->rate || !spec->channels)
return 0;
if (spec->format >= PA_SAMPLE_MAX)
return 0;
return 1;
}
int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b) {
assert(a && b);
return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
}
void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
static const char* const table[]= {
[PA_SAMPLE_U8] = "U8",
[PA_SAMPLE_ALAW] = "ALAW",
[PA_SAMPLE_ULAW] = "ULAW",
[PA_SAMPLE_S16LE] = "S16LE",
[PA_SAMPLE_S16BE] = "S16BE",
[PA_SAMPLE_FLOAT32LE] = "FLOAT32LE",
[PA_SAMPLE_FLOAT32BE] = "FLOAT32BE",
};
assert(pa_sample_spec_valid(spec));
snprintf(s, l, "%s %uch %uHz", table[spec->format], spec->channels, spec->rate);
}
pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b) {
uint64_t p = a;
p *= b;
p /= PA_VOLUME_NORM;
return (pa_volume_t) p;
}
pa_volume_t pa_volume_from_dB(double f) {
if (f <= PA_DECIBEL_MININFTY)
return PA_VOLUME_MUTED;
return (pa_volume_t) (pow(10, f/20)*PA_VOLUME_NORM);
}
double pa_volume_to_dB(pa_volume_t v) {
if (v == PA_VOLUME_MUTED)
return PA_DECIBEL_MININFTY;
return 20*log10((double) v/PA_VOLUME_NORM);
}
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