mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-02 09:01:46 -05:00
521 lines
12 KiB
C
521 lines
12 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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PulseAudio 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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PulseAudio 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 PulseAudio; 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 <pulse/i18n.h>
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#include <pulsecore/core-util.h>
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#include <pulsecore/macro.h>
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#include "volume.h"
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int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) {
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int i;
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pa_assert(a);
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pa_assert(b);
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if (a->channels != b->channels)
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return 0;
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for (i = 0; i < a->channels; i++)
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if (a->values[i] != b->values[i])
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return 0;
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return 1;
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}
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pa_cvolume* pa_cvolume_init(pa_cvolume *a) {
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unsigned c;
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pa_assert(a);
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a->channels = 0;
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for (c = 0; c < PA_CHANNELS_MAX; c++)
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a->values[c] = (pa_volume_t) -1;
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return a;
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}
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pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
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int i;
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pa_assert(a);
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pa_assert(channels > 0);
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pa_assert(channels <= PA_CHANNELS_MAX);
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a->channels = (uint8_t) channels;
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for (i = 0; i < a->channels; i++)
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a->values[i] = v;
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return a;
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}
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pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
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uint64_t sum = 0;
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int i;
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pa_assert(a);
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for (i = 0; i < a->channels; i++)
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sum += a->values[i];
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sum /= a->channels;
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return (pa_volume_t) sum;
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}
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pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
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pa_volume_t m = 0;
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int i;
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pa_assert(a);
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for (i = 0; i < a->channels; i++)
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if (a->values[i] > m)
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m = a->values[i];
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return m;
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}
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pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
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return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) * pa_sw_volume_to_linear(b));
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}
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pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
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double v = pa_sw_volume_to_linear(b);
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if (v <= 0)
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return 0;
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return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) / v);
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}
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#define USER_DECIBEL_RANGE 60
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pa_volume_t pa_sw_volume_from_dB(double dB) {
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if (isinf(dB) < 0 || dB <= -USER_DECIBEL_RANGE)
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return PA_VOLUME_MUTED;
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return (pa_volume_t) lrint((dB/USER_DECIBEL_RANGE+1)*PA_VOLUME_NORM);
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}
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double pa_sw_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 ((double) v/PA_VOLUME_NORM-1)*USER_DECIBEL_RANGE;
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}
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pa_volume_t pa_sw_volume_from_linear(double v) {
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if (v <= 0)
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return PA_VOLUME_MUTED;
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if (v > .999 && v < 1.001)
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return PA_VOLUME_NORM;
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return pa_sw_volume_from_dB(20*log10(v));
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}
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double pa_sw_volume_to_linear(pa_volume_t v) {
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if (v == PA_VOLUME_MUTED)
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return 0;
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return pow(10.0, pa_sw_volume_to_dB(v)/20.0);
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}
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char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) {
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unsigned channel;
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pa_bool_t first = TRUE;
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char *e;
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pa_assert(s);
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pa_assert(l > 0);
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pa_assert(c);
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pa_init_i18n();
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if (!pa_cvolume_valid(c)) {
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pa_snprintf(s, l, _("(invalid)"));
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return s;
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}
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*(e = s) = 0;
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for (channel = 0; channel < c->channels && l > 1; channel++) {
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l -= pa_snprintf(e, l, "%s%u: %3u%%",
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first ? "" : " ",
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channel,
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(c->values[channel]*100)/PA_VOLUME_NORM);
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e = strchr(e, 0);
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first = FALSE;
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}
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return s;
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}
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char *pa_volume_snprint(char *s, size_t l, pa_volume_t v) {
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pa_assert(s);
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pa_assert(l > 0);
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pa_init_i18n();
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if (v == (pa_volume_t) -1) {
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pa_snprintf(s, l, _("(invalid)"));
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return s;
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}
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pa_snprintf(s, l, "%3u%%", (v*100)/PA_VOLUME_NORM);
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return s;
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}
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char *pa_sw_cvolume_snprint_dB(char *s, size_t l, const pa_cvolume *c) {
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unsigned channel;
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pa_bool_t first = TRUE;
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char *e;
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pa_assert(s);
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pa_assert(l > 0);
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pa_assert(c);
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pa_init_i18n();
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if (!pa_cvolume_valid(c)) {
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pa_snprintf(s, l, _("(invalid)"));
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return s;
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}
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*(e = s) = 0;
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for (channel = 0; channel < c->channels && l > 1; channel++) {
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double f = pa_sw_volume_to_dB(c->values[channel]);
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l -= pa_snprintf(e, l, "%s%u: %0.2f dB",
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first ? "" : " ",
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channel,
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isinf(f) < 0 || f <= -USER_DECIBEL_RANGE ? -INFINITY : f);
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e = strchr(e, 0);
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first = FALSE;
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}
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return s;
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}
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char *pa_sw_volume_snprint_dB(char *s, size_t l, pa_volume_t v) {
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double f;
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pa_assert(s);
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pa_assert(l > 0);
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pa_init_i18n();
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if (v == (pa_volume_t) -1) {
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pa_snprintf(s, l, _("(invalid)"));
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return s;
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}
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f = pa_sw_volume_to_dB(v);
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pa_snprintf(s, l, "%0.2f dB",
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isinf(f) < 0 || f <= -USER_DECIBEL_RANGE ? -INFINITY : f);
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return s;
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}
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/** Return non-zero if the volume of all channels is equal to the specified value */
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int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) {
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unsigned c;
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pa_assert(a);
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for (c = 0; c < a->channels; c++)
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if (a->values[c] != v)
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return 0;
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return 1;
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}
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pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
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unsigned i;
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pa_assert(dest);
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pa_assert(a);
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pa_assert(b);
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for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
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dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]);
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dest->channels = (uint8_t) i;
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return dest;
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}
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pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
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unsigned i;
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pa_assert(dest);
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pa_assert(a);
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pa_assert(b);
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for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
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dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]);
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dest->channels = (uint8_t) i;
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return dest;
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}
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int pa_cvolume_valid(const pa_cvolume *v) {
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unsigned c;
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pa_assert(v);
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if (v->channels <= 0 || v->channels > PA_CHANNELS_MAX)
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return 0;
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for (c = 0; c < v->channels; c++)
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if (v->values[c] == (pa_volume_t) -1)
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return 0;
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return 1;
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}
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static pa_bool_t on_left(pa_channel_position_t p) {
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return
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p == PA_CHANNEL_POSITION_FRONT_LEFT ||
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p == PA_CHANNEL_POSITION_REAR_LEFT ||
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p == PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER ||
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p == PA_CHANNEL_POSITION_SIDE_LEFT ||
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p == PA_CHANNEL_POSITION_TOP_FRONT_LEFT ||
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p == PA_CHANNEL_POSITION_TOP_REAR_LEFT;
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}
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static pa_bool_t on_right(pa_channel_position_t p) {
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return
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p == PA_CHANNEL_POSITION_FRONT_RIGHT ||
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p == PA_CHANNEL_POSITION_REAR_RIGHT ||
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p == PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER ||
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p == PA_CHANNEL_POSITION_SIDE_RIGHT ||
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p == PA_CHANNEL_POSITION_TOP_FRONT_RIGHT ||
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p == PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
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}
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static pa_bool_t on_center(pa_channel_position_t p) {
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return
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p == PA_CHANNEL_POSITION_FRONT_CENTER ||
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p == PA_CHANNEL_POSITION_REAR_CENTER ||
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p == PA_CHANNEL_POSITION_TOP_CENTER ||
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p == PA_CHANNEL_POSITION_TOP_FRONT_CENTER ||
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p == PA_CHANNEL_POSITION_TOP_REAR_CENTER;
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}
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static pa_bool_t on_lfe(pa_channel_position_t p) {
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return
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p == PA_CHANNEL_POSITION_LFE;
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}
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pa_cvolume *pa_cvolume_remap(pa_cvolume *v, const pa_channel_map *from, const pa_channel_map *to) {
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int a, b;
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pa_cvolume result;
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pa_assert(v);
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pa_assert(from);
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pa_assert(to);
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pa_assert(v->channels == from->channels);
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if (pa_channel_map_equal(from, to))
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return v;
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result.channels = to->channels;
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for (b = 0; b < to->channels; b++) {
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pa_volume_t k = 0;
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int n = 0;
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for (a = 0; a < from->channels; a++)
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if (from->map[a] == to->map[b]) {
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k += v->values[a];
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n ++;
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}
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if (n <= 0) {
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for (a = 0; a < from->channels; a++)
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if ((on_left(from->map[a]) && on_left(to->map[b])) ||
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(on_right(from->map[a]) && on_right(to->map[b])) ||
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(on_center(from->map[a]) && on_center(to->map[b])) ||
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(on_lfe(from->map[a]) && on_lfe(to->map[b]))) {
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k += v->values[a];
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n ++;
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}
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}
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if (n <= 0)
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k = pa_cvolume_avg(v);
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else
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k /= n;
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result.values[b] = k;
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}
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*v = result;
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return v;
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}
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int pa_cvolume_compatible(const pa_cvolume *v, const pa_sample_spec *ss) {
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pa_assert(v);
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pa_assert(ss);
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if (!pa_cvolume_valid(v))
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return 0;
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if (!pa_sample_spec_valid(ss))
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return 0;
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return v->channels == ss->channels;
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}
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static void get_avg_lr(const pa_channel_map *map, const pa_cvolume *v, pa_volume_t *l, pa_volume_t *r) {
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int c;
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pa_volume_t left = 0, right = 0;
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unsigned n_left = 0, n_right = 0;
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pa_assert(v);
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pa_assert(map);
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pa_assert(map->channels == v->channels);
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pa_assert(l);
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pa_assert(r);
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for (c = 0; c < map->channels; c++) {
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if (on_left(map->map[c])) {
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left += v->values[c];
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n_left++;
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} else if (on_right(map->map[c])) {
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right += v->values[c];
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n_right++;
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}
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}
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if (n_left <= 0)
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*l = PA_VOLUME_NORM;
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else
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*l = left / n_left;
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if (n_right <= 0)
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*r = PA_VOLUME_NORM;
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else
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*r = right / n_right;
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}
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float pa_cvolume_get_balance(const pa_cvolume *v, const pa_channel_map *map) {
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pa_volume_t left, right;
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pa_assert(v);
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pa_assert(map);
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pa_assert(map->channels == v->channels);
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get_avg_lr(map, v, &left, &right);
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if (left == right)
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return 0.0f;
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/* 1.0, 0.0 => -1.0
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0.0, 1.0 => 1.0
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0.0, 0.0 => 0.0
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0.5, 0.5 => 0.0
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1.0, 0.5 => -0.5
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1.0, 0.25 => -0.75
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0.75, 0.25 => -0.66
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0.5, 0.25 => -0.5 */
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if (left > right)
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return -1.0f + ((float) right / (float) left);
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else
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return 1.0f - ((float) left / (float) right);
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}
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pa_cvolume* pa_cvolume_set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance) {
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pa_volume_t left, nleft, right, nright, m;
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unsigned c;
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pa_assert(map->channels == v->channels);
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pa_assert(map);
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pa_assert(v);
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pa_assert(new_balance >= -1.0f);
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pa_assert(new_balance <= 1.0f);
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get_avg_lr(map, v, &left, &right);
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m = PA_MAX(left, right);
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if (new_balance <= 0) {
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nright = (new_balance + 1.0f) * m;
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nleft = m;
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} else {
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nleft = (1.0f - new_balance) * m;
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nright = m;
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}
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for (c = 0; c < map->channels; c++) {
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if (on_left(map->map[c])) {
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if (left == 0)
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v->values[c] = nleft;
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else
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v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) nleft) / (uint64_t) left);
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} else if (on_right(map->map[c])) {
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if (right == 0)
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v->values[c] = nright;
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else
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v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) nright) / (uint64_t) right);
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}
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}
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return v;
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}
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pa_cvolume* pa_cvolume_scale(pa_cvolume *v, pa_volume_t max) {
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unsigned c;
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pa_volume_t t = 0;
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pa_assert(c);
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for (c = 0; c < v->channels; c++)
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if (v->values[c] > t)
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t = v->values[c];
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if (t <= 0)
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return pa_cvolume_set(v, v->channels, max);
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for (c = 0; c < v->channels; c++)
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v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
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return v;
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}
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