mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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fa499dad06
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@284 fefdeb5f-60dc-0310-8127-8f9354f1896f
137 lines
3.8 KiB
C
137 lines
3.8 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 Lesser 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 Lesser 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 <string.h>
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#include <assert.h>
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#include "sample-util.h"
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struct pa_memblock *pa_silence_memblock(struct pa_memblock* b, const struct pa_sample_spec *spec) {
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assert(b && b->data && spec);
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pa_silence_memory(b->data, b->length, spec);
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return b;
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}
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void pa_silence_memchunk(struct pa_memchunk *c, const struct pa_sample_spec *spec) {
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assert(c && c->memblock && c->memblock->data && spec && c->length);
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pa_silence_memory((uint8_t*) c->memblock->data+c->index, c->length, spec);
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}
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void pa_silence_memory(void *p, size_t length, const struct pa_sample_spec *spec) {
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char c = 0;
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assert(p && length && spec);
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switch (spec->format) {
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case PA_SAMPLE_U8:
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c = 127;
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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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case PA_SAMPLE_FLOAT32:
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c = 0;
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break;
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case PA_SAMPLE_ALAW:
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case PA_SAMPLE_ULAW:
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c = 80;
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break;
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default:
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assert(0);
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}
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memset(p, c, length);
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}
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size_t pa_mix(struct pa_mix_info channels[], unsigned nchannels, void *data, size_t length, const struct pa_sample_spec *spec, pa_volume_t volume) {
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unsigned c, d;
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assert(channels && data && length && spec);
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assert(spec->format == PA_SAMPLE_S16NE);
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for (d = 0;; d += sizeof(int16_t)) {
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int32_t sum = 0;
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if (d >= length)
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return d;
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for (c = 0; c < nchannels; c++) {
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int32_t v;
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uint32_t volume = channels[c].volume;
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if (d >= channels[c].chunk.length)
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return d;
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if (volume == PA_VOLUME_MUTED)
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v = 0;
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else {
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v = *((int16_t*) ((uint8_t*) channels[c].chunk.memblock->data + channels[c].chunk.index + d));
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if (volume != PA_VOLUME_NORM)
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v = (int32_t) ((float)v*volume/PA_VOLUME_NORM);
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}
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sum += v;
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}
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if (volume == PA_VOLUME_MUTED)
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sum = 0;
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else if (volume != PA_VOLUME_NORM)
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sum = (int32_t) ((float) sum*volume/PA_VOLUME_NORM);
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if (sum < -0x8000) sum = -0x8000;
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if (sum > 0x7FFF) sum = 0x7FFF;
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*((int16_t*) data) = sum;
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data = (uint8_t*) data + sizeof(int16_t);
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}
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}
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void pa_volume_memchunk(struct pa_memchunk*c, const struct pa_sample_spec *spec, pa_volume_t volume) {
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int16_t *d;
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size_t n;
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assert(c && spec && (c->length % pa_frame_size(spec) == 0));
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assert(spec->format == PA_SAMPLE_S16NE);
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if (volume == PA_VOLUME_NORM)
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return;
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if (volume == PA_VOLUME_MUTED) {
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pa_silence_memchunk(c, spec);
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return;
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}
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for (d = (int16_t*) ((uint8_t*) c->memblock->data+c->index), n = c->length/sizeof(int16_t); n > 0; d++, n--) {
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int32_t t = (int32_t)(*d);
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t *= volume;
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t /= PA_VOLUME_NORM;
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if (t < -0x8000) t = -0x8000;
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if (t > 0x7FFF) t = 0x7FFF;
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*d = (int16_t) t;
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}
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}
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