mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-02 09:01:46 -05:00
f8808a2525
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@467 fefdeb5f-60dc-0310-8127-8f9354f1896f
325 lines
10 KiB
C
325 lines
10 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 <stdlib.h>
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#include <liboil/liboilfuncs.h>
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#include "log.h"
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#include "sample-util.h"
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pa_memblock *pa_silence_memblock(pa_memblock* b, const 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(pa_memchunk *c, const 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 pa_sample_spec *spec) {
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uint8_t 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 = 0x80;
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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(
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const pa_mix_info streams[],
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unsigned nstreams,
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void *data,
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size_t length,
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const pa_sample_spec *spec,
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const pa_cvolume *volume) {
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assert(streams && data && length && spec);
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switch (spec->format) {
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case PA_SAMPLE_S16NE:{
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size_t d;
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unsigned channel = 0;
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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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if (volume->values[channel] != PA_VOLUME_MUTED) {
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unsigned i;
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for (i = 0; i < nstreams; i++) {
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int32_t v;
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pa_volume_t cvolume = streams[i].volume.values[channel];
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if (d >= streams[i].chunk.length)
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return d;
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if (cvolume == PA_VOLUME_MUTED)
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v = 0;
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else {
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v = *((int16_t*) ((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d));
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if (cvolume != PA_VOLUME_NORM) {
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v *= cvolume;
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v /= PA_VOLUME_NORM;
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}
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}
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sum += v;
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}
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if (volume->values[channel] != PA_VOLUME_NORM) {
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sum *= volume->values[channel];
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sum /= PA_VOLUME_NORM;
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}
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if (sum < -0x8000) sum = -0x8000;
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if (sum > 0x7FFF) sum = 0x7FFF;
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}
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*((int16_t*) data) = sum;
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data = (uint8_t*) data + sizeof(int16_t);
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if (++channel >= spec->channels)
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channel = 0;
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}
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}
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case PA_SAMPLE_U8: {
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size_t d;
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unsigned channel = 0;
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for (d = 0;; d ++) {
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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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if (volume->values[channel] != PA_VOLUME_MUTED) {
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unsigned i;
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for (i = 0; i < nstreams; i++) {
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int32_t v;
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pa_volume_t cvolume = streams[i].volume.values[channel];
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if (d >= streams[i].chunk.length)
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return d;
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if (cvolume == PA_VOLUME_MUTED)
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v = 0;
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else {
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v = (int32_t) *((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d) - 0x80;
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if (cvolume != PA_VOLUME_NORM) {
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v *= cvolume;
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v /= PA_VOLUME_NORM;
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}
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}
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sum += v;
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}
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if (volume->values[channel] != PA_VOLUME_NORM) {
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sum *= volume->values[channel];
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sum /= PA_VOLUME_NORM;
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}
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if (sum < -0x80) sum = -0x80;
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if (sum > 0x7F) sum = 0x7F;
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}
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*((uint8_t*) data) = (uint8_t) (sum + 0x80);
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data = (uint8_t*) data + 1;
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if (++channel >= spec->channels)
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channel = 0;
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}
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}
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case PA_SAMPLE_FLOAT32NE: {
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size_t d;
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unsigned channel = 0;
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for (d = 0;; d += sizeof(float)) {
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float sum = 0;
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if (d >= length)
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return d;
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if (volume->values[channel] != PA_VOLUME_MUTED) {
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unsigned i;
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for (i = 0; i < nstreams; i++) {
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float v;
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pa_volume_t cvolume = streams[i].volume.values[channel];
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if (d >= streams[i].chunk.length)
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return d;
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if (cvolume == PA_VOLUME_MUTED)
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v = 0;
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else {
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v = *((float*) ((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d));
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if (cvolume != PA_VOLUME_NORM) {
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v *= cvolume;
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v /= PA_VOLUME_NORM;
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}
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}
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sum += v;
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}
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if (volume->values[channel] != PA_VOLUME_NORM) {
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sum *= volume->values[channel];
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sum /= PA_VOLUME_NORM;
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}
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}
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*((float*) data) = sum;
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data = (uint8_t*) data + sizeof(float);
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if (++channel >= spec->channels)
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channel = 0;
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}
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}
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default:
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abort();
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}
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}
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void pa_volume_memchunk(pa_memchunk*c, const pa_sample_spec *spec, const pa_cvolume *volume) {
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assert(c && spec && (c->length % pa_frame_size(spec) == 0));
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assert(volume);
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if (pa_cvolume_channels_equal_to(volume, PA_VOLUME_NORM))
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return;
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if (pa_cvolume_channels_equal_to(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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switch (spec->format) {
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case PA_SAMPLE_S16NE: {
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int16_t *d;
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size_t n;
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unsigned channel = 0;
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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->values[channel];
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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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if (++channel >= spec->channels)
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channel = 0;
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}
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}
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case PA_SAMPLE_U8: {
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uint8_t *d;
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size_t n;
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unsigned channel = 0;
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for (d = (uint8_t*) c->memblock->data + c->index, n = c->length; n > 0; d++, n--) {
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int32_t t = (int32_t) *d - 0x80;
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t *= volume->values[channel];
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t /= PA_VOLUME_NORM;
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if (t < -0x80) t = -0x80;
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if (t > 0x7F) t = 0x7F;
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*d = (uint8_t) (t + 0x80);
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if (++channel >= spec->channels)
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channel = 0;
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}
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}
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case PA_SAMPLE_FLOAT32NE: {
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float *d;
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int skip;
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unsigned n;
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unsigned channel;
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d = (float*) ((uint8_t*) c->memblock->data + c->index);
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skip = spec->channels * sizeof(float);
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n = c->length/sizeof(float)/spec->channels;
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for (channel = 0; channel < spec->channels ; channel ++) {
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float v, *t;
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if (volume->values[channel] == PA_VOLUME_NORM)
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continue;
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v = (float) volume->values[channel] / PA_VOLUME_NORM;
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t = d + channel;
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oil_scalarmult_f32(t, skip, t, skip, &v, n);
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}
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}
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default:
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pa_log_error(__FILE__": ERROR: Unable to change volume of format %s.\n",
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pa_sample_format_to_string(spec->format));
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abort();
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}
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}
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