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https://github.com/mpv-player/mpv
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0969502316
And use it for the mono case. This is slightly more formal and will make it easier to add more such cases.
360 lines
11 KiB
C
360 lines
11 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv 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 by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <assert.h>
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#include <limits.h>
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#include "common/common.h"
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#include "chmap_sel.h"
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static const struct mp_chmap speaker_replacements[][2] = {
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// 5.1 <-> 5.1 (side)
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{ MP_CHMAP2(SL, SR), MP_CHMAP2(BL, BR) },
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// 7.1 <-> 7.1 (rear ext)
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{ MP_CHMAP2(SL, SR), MP_CHMAP2(SDL, SDR) },
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};
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// Try to replace speakers from the left of the list with the ones on the
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// right, or the other way around.
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static bool replace_speakers(struct mp_chmap *map, struct mp_chmap list[2])
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{
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assert(list[0].num == list[1].num);
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if (!mp_chmap_is_valid(map))
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return false;
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for (int dir = 0; dir < 2; dir++) {
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int from = dir ? 0 : 1;
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int to = dir ? 1 : 0;
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bool replaced = false;
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struct mp_chmap t = *map;
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for (int n = 0; n < t.num; n++) {
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for (int i = 0; i < list[0].num; i++) {
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if (t.speaker[n] == list[from].speaker[i]) {
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t.speaker[n] = list[to].speaker[i];
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replaced = true;
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break;
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}
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}
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}
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if (replaced && mp_chmap_is_valid(&t)) {
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*map = t;
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return true;
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}
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}
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return false;
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}
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// These go strictly from the first to the second entry and always use the
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// full layout (possibly reordered and/or padding channels added).
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static const struct mp_chmap preferred_remix[][2] = {
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// mono can be perfectly played as stereo
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{ MP_CHMAP_INIT_MONO, MP_CHMAP_INIT_STEREO },
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};
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// Conversion from src to dst is explicitly encouraged and should be preferred
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// over "mathematical" upmixes or downmixes (which minimize lost channels).
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static bool test_preferred_remix(const struct mp_chmap *src,
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const struct mp_chmap *dst)
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{
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struct mp_chmap src_p = *src, dst_p = *dst;
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mp_chmap_remove_na(&src_p);
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mp_chmap_remove_na(&dst_p);
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for (int n = 0; n < MP_ARRAY_SIZE(preferred_remix); n++) {
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if (mp_chmap_equals_reordered(&src_p, &preferred_remix[n][0]) &&
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mp_chmap_equals_reordered(&dst_p, &preferred_remix[n][1]))
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return true;
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}
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return false;
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}
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// Allow all channel layouts that can be expressed with mp_chmap.
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// (By default, all layouts are rejected.)
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void mp_chmap_sel_add_any(struct mp_chmap_sel *s)
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{
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s->allow_any = true;
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}
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// Allow all waveext formats, and force waveext channel order.
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void mp_chmap_sel_add_waveext(struct mp_chmap_sel *s)
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{
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s->allow_waveext = true;
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}
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// Classic ALSA-based MPlayer layouts.
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void mp_chmap_sel_add_alsa_def(struct mp_chmap_sel *s)
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{
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for (int n = 1; n <= MP_NUM_CHANNELS; n++) {
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struct mp_chmap t;
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mp_chmap_from_channels_alsa(&t, n);
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if (t.num)
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mp_chmap_sel_add_map(s, &t);
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}
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}
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// Add a channel map that should be allowed.
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void mp_chmap_sel_add_map(struct mp_chmap_sel *s, const struct mp_chmap *map)
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{
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if (!mp_chmap_is_valid(map))
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return;
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if (!s->chmaps)
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s->chmaps = s->chmaps_storage;
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if (s->num_chmaps == MP_ARRAY_SIZE(s->chmaps_storage)) {
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if (!s->tmp)
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return;
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s->chmaps = talloc_memdup(s->tmp, s->chmaps, sizeof(s->chmaps_storage));
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}
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if (s->chmaps != s->chmaps_storage)
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MP_TARRAY_GROW(s->tmp, s->chmaps, s->num_chmaps);
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s->chmaps[s->num_chmaps++] = *map;
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}
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// Allow all waveext formats in default order.
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void mp_chmap_sel_add_waveext_def(struct mp_chmap_sel *s)
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{
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for (int n = 1; n <= MP_NUM_CHANNELS; n++) {
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struct mp_chmap map;
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mp_chmap_from_channels(&map, n);
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mp_chmap_sel_add_map(s, &map);
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}
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}
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// Whitelist a speaker (MP_SPEAKER_ID_...). All layouts that contain whitelisted
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// speakers are allowed.
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void mp_chmap_sel_add_speaker(struct mp_chmap_sel *s, int id)
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{
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assert(id >= 0 && id < MP_SPEAKER_ID_COUNT);
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s->speakers[id] = true;
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}
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static bool test_speakers(const struct mp_chmap_sel *s, struct mp_chmap *map)
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{
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for (int n = 0; n < map->num; n++) {
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if (!s->speakers[map->speaker[n]])
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return false;
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}
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return true;
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}
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static bool test_maps(const struct mp_chmap_sel *s, struct mp_chmap *map)
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{
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for (int n = 0; n < s->num_chmaps; n++) {
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if (mp_chmap_equals_reordered(&s->chmaps[n], map)) {
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*map = s->chmaps[n];
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return true;
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}
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}
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return false;
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}
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static bool test_waveext(const struct mp_chmap_sel *s, struct mp_chmap *map)
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{
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if (s->allow_waveext) {
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struct mp_chmap t = *map;
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mp_chmap_reorder_to_waveext(&t);
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if (mp_chmap_is_waveext(&t)) {
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*map = t;
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return true;
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}
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}
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return false;
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}
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static bool test_layout(const struct mp_chmap_sel *s, struct mp_chmap *map)
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{
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if (!mp_chmap_is_valid(map))
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return false;
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return s->allow_any || test_waveext(s, map) || test_speakers(s, map) ||
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test_maps(s, map);
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}
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// Determine which channel map to use given a source channel map, and various
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// parameters restricting possible choices. If the map doesn't match, select
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// a fallback and set it.
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// If no matching layout is found, a reordered layout may be returned.
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// If that is not possible, a fallback for up/downmixing may be returned.
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// If no choice is possible, set *map to empty.
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bool mp_chmap_sel_adjust(const struct mp_chmap_sel *s, struct mp_chmap *map)
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{
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if (test_layout(s, map))
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return true;
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if (mp_chmap_is_unknown(map)) {
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struct mp_chmap t = {0};
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if (mp_chmap_sel_get_def(s, &t, map->num) && test_layout(s, &t)) {
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*map = t;
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return true;
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}
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}
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if (mp_chmap_sel_fallback(s, map))
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return true;
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for (int i = 0; i < MP_ARRAY_SIZE(speaker_replacements); i++) {
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struct mp_chmap t = *map;
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struct mp_chmap *r = (struct mp_chmap *)speaker_replacements[i];
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if (replace_speakers(&t, r) && test_layout(s, &t)) {
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*map = t;
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return true;
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}
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}
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// Fallback to mono/stereo as last resort
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*map = (struct mp_chmap) MP_CHMAP_INIT_STEREO;
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if (test_layout(s, map))
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return true;
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*map = (struct mp_chmap) MP_CHMAP_INIT_MONO;
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if (test_layout(s, map))
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return true;
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*map = (struct mp_chmap) {0};
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return false;
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}
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// Like mp_chmap_diffn(), but find the minimum difference with all possible
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// speaker replacements considered.
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static int mp_chmap_diffn_r(const struct mp_chmap *a, const struct mp_chmap *b)
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{
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int mindiff = INT_MAX;
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for (int i = -1; i < (int)MP_ARRAY_SIZE(speaker_replacements); i++) {
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struct mp_chmap ar = *a;
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if (i >= 0) {
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struct mp_chmap *r = (struct mp_chmap *)speaker_replacements[i];
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if (!replace_speakers(&ar, r))
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continue;
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}
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int d = mp_chmap_diffn(&ar, b);
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if (d < mindiff)
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mindiff = d;
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}
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// Special-case: we consider stereo a replacement for mono. (This is not
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// true in the other direction. Also, fl-fr is generally not a replacement
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// for fc. Thus it's not part of the speaker replacement list.)
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struct mp_chmap mono = MP_CHMAP_INIT_MONO;
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struct mp_chmap stereo = MP_CHMAP_INIT_STEREO;
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if (mp_chmap_equals(&mono, b) && mp_chmap_equals(&stereo, a))
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mindiff = 0;
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return mindiff;
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}
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// Decide whether we should prefer old or new for the requested layout.
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// Return true if new should be used, false if old should be used.
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// If old is empty, always return new (initial case).
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static bool mp_chmap_is_better(struct mp_chmap *req, struct mp_chmap *old,
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struct mp_chmap *new)
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{
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// Initial case
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if (!old->num)
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return true;
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// Exact pick - this also ensures that the best layout is chosen if the
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// layouts are the same, but with different order of channels.
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if (mp_chmap_equals(req, old))
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return false;
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if (mp_chmap_equals(req, new))
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return true;
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// If there's no exact match, strictly do a preferred conversion.
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bool old_pref = test_preferred_remix(req, old);
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bool new_pref = test_preferred_remix(req, new);
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if (old_pref && !new_pref)
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return false;
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if (!old_pref && new_pref)
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return true;
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int old_lost_r = mp_chmap_diffn_r(req, old); // num. channels only in req
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int new_lost_r = mp_chmap_diffn_r(req, new);
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// Imperfect upmix (no real superset) - minimize lost channels
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if (new_lost_r != old_lost_r)
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return new_lost_r < old_lost_r;
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int old_lost = mp_chmap_diffn(req, old);
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int new_lost = mp_chmap_diffn(req, new);
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// If the situation is equal with replaced speakers, but one of them loses
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// less if no replacements are performed, pick the better one, even if it
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// means an upmix. This prefers exact supersets over inexact equivalents.
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if (new_lost != old_lost)
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return new_lost < old_lost;
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struct mp_chmap old_p = *old, new_p = *new;
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mp_chmap_remove_na(&old_p);
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mp_chmap_remove_na(&new_p);
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// Some kind of upmix. If it's perfect, prefer the smaller one. Even if not,
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// both have equal loss, so also prefer the smaller one.
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// Drop padding channels (NA) for the sake of this check, as the number of
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// padding channels isn't really meaningful.
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if (new_p.num != old_p.num)
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return new_p.num < old_p.num;
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// Again, with physical channels (minimizes number of NA channels).
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return new->num < old->num;
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}
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// Determine which channel map to fallback to given a source channel map.
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bool mp_chmap_sel_fallback(const struct mp_chmap_sel *s, struct mp_chmap *map)
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{
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struct mp_chmap best = {0};
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for (int n = 0; n < s->num_chmaps; n++) {
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struct mp_chmap e = s->chmaps[n];
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if (mp_chmap_is_unknown(&e))
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continue;
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if (mp_chmap_is_better(map, &best, &e))
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best = e;
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}
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if (best.num) {
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*map = best;
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return true;
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}
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return false;
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}
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// Set map to a default layout with num channels. Used for audio APIs that
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// return a channel count as part of format negotiation, but give no
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// information about the channel layout.
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// If the channel count is correct, do nothing and leave *map untouched.
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bool mp_chmap_sel_get_def(const struct mp_chmap_sel *s, struct mp_chmap *map,
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int num)
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{
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if (map->num != num) {
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*map = (struct mp_chmap) {0};
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// Set of speakers or waveext might allow it.
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struct mp_chmap t;
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mp_chmap_from_channels(&t, num);
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mp_chmap_reorder_to_waveext(&t);
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if (test_layout(s, &t)) {
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*map = t;
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} else {
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for (int n = 0; n < s->num_chmaps; n++) {
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if (s->chmaps[n].num == num) {
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*map = s->chmaps[n];
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break;
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}
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}
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}
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}
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return map->num > 0;
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}
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