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https://github.com/mpv-player/mpv
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54aea7d5de
Instead of just failing during channel map selection, try to select a close layout that makes most sense and upmix/downmix to that instead of failing AO initialization. The heuristic is rather simple, and uses the following steps: 1) If mono is required always prefer stereo to a multichannel upmix. 2) Search for an upmix that is an exact superset of the required channel map. 3) Search for a downmix that is the exact subset of the required channel map. 4) Search for either an upmix or downmix that is the closest (minimum difference of channels) to the required channel map.
49 lines
1.7 KiB
C
49 lines
1.7 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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#ifndef MP_CHMAP_SEL_H
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#define MP_CHMAP_SEL_H
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#include <stdbool.h>
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#include "chmap.h"
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struct mp_chmap_sel {
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// should be considered opaque
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bool allow_any, allow_waveext;
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bool speakers[MP_SPEAKER_ID_COUNT];
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struct mp_chmap *chmaps;
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int num_chmaps;
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struct mp_chmap chmaps_storage[20];
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void *tmp; // set to any talloc context to allow more chmaps entries
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};
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void mp_chmap_sel_add_any(struct mp_chmap_sel *s);
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void mp_chmap_sel_add_waveext(struct mp_chmap_sel *s);
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void mp_chmap_sel_add_waveext_def(struct mp_chmap_sel *s);
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void mp_chmap_sel_add_alsa_def(struct mp_chmap_sel *s);
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void mp_chmap_sel_add_map(struct mp_chmap_sel *s, const struct mp_chmap *map);
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void mp_chmap_sel_add_speaker(struct mp_chmap_sel *s, int id);
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bool mp_chmap_sel_adjust(const struct mp_chmap_sel *s, struct mp_chmap *map);
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bool mp_chmap_sel_fallback(const struct mp_chmap_sel *s, struct mp_chmap *map);
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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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#endif
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