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https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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0205fc57bb
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@169 fefdeb5f-60dc-0310-8127-8f9354f1896f
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <assert.h>
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#include <math.h>
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#include "sample.h"
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size_t pa_frame_size(const struct pa_sample_spec *spec) {
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size_t b = 1;
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assert(spec);
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switch (spec->format) {
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case PA_SAMPLE_U8:
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case PA_SAMPLE_ULAW:
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case PA_SAMPLE_ALAW:
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b = 1;
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break;
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case PA_SAMPLE_S16LE:
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case PA_SAMPLE_S16BE:
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b = 2;
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break;
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case PA_SAMPLE_FLOAT32LE:
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case PA_SAMPLE_FLOAT32BE:
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b = 4;
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break;
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default:
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assert(0);
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}
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return b * spec->channels;
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}
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size_t pa_bytes_per_second(const struct pa_sample_spec *spec) {
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assert(spec);
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return spec->rate*pa_frame_size(spec);
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}
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uint32_t pa_bytes_to_usec(size_t length, const struct pa_sample_spec *spec) {
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assert(spec);
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return (uint32_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
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}
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int pa_sample_spec_valid(const struct pa_sample_spec *spec) {
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assert(spec);
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if (!spec->rate || !spec->channels)
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return 0;
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if (spec->format >= PA_SAMPLE_MAX)
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return 0;
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return 1;
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}
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int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b) {
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assert(a && b);
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return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
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}
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void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
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static const char* const table[]= {
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[PA_SAMPLE_U8] = "U8",
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[PA_SAMPLE_ALAW] = "ALAW",
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[PA_SAMPLE_ULAW] = "ULAW",
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[PA_SAMPLE_S16LE] = "S16LE",
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[PA_SAMPLE_S16BE] = "S16BE",
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[PA_SAMPLE_FLOAT32LE] = "FLOAT32LE",
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[PA_SAMPLE_FLOAT32BE] = "FLOAT32BE",
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};
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assert(pa_sample_spec_valid(spec));
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snprintf(s, l, "%s %uch %uHz", table[spec->format], spec->channels, spec->rate);
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}
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pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b) {
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uint64_t p = a;
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p *= b;
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p /= PA_VOLUME_NORM;
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return (pa_volume_t) p;
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}
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pa_volume_t pa_volume_from_dB(double f) {
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if (f <= PA_DECIBEL_MININFTY)
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return PA_VOLUME_MUTED;
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return (pa_volume_t) (pow(10, f/20)*PA_VOLUME_NORM);
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}
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double pa_volume_to_dB(pa_volume_t v) {
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if (v == PA_VOLUME_MUTED)
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return PA_DECIBEL_MININFTY;
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return 20*log10((double) v/PA_VOLUME_NORM);
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}
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