mirror of
https://github.com/mpv-player/mpv
synced 2024-12-12 01:46:16 +00:00
891a9727c6
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.
143 lines
5.6 KiB
C
143 lines
5.6 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_H
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#define MP_CHMAP_H
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#include <inttypes.h>
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#include <stdbool.h>
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#include "misc/bstr.h"
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#define MP_NUM_CHANNELS 8
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// Speaker a channel can be assigned to.
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// This corresponds to WAVEFORMATEXTENSIBLE channel mask bit indexes.
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// E.g. channel_mask = (1 << MP_SPEAKER_ID_FL) | ...
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enum mp_speaker_id {
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// Official WAVEFORMATEXTENSIBLE (shortened names)
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MP_SPEAKER_ID_FL = 0, // FRONT_LEFT
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MP_SPEAKER_ID_FR, // FRONT_RIGHT
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MP_SPEAKER_ID_FC, // FRONT_CENTER
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MP_SPEAKER_ID_LFE, // LOW_FREQUENCY
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MP_SPEAKER_ID_BL, // BACK_LEFT
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MP_SPEAKER_ID_BR, // BACK_RIGHT
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MP_SPEAKER_ID_FLC, // FRONT_LEFT_OF_CENTER
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MP_SPEAKER_ID_FRC, // FRONT_RIGHT_OF_CENTER
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MP_SPEAKER_ID_BC, // BACK_CENTER
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MP_SPEAKER_ID_SL, // SIDE_LEFT
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MP_SPEAKER_ID_SR, // SIDE_RIGHT
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MP_SPEAKER_ID_TC, // TOP_CENTER
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MP_SPEAKER_ID_TFL, // TOP_FRONT_LEFT
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MP_SPEAKER_ID_TFC, // TOP_FRONT_CENTER
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MP_SPEAKER_ID_TFR, // TOP_FRONT_RIGHT
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MP_SPEAKER_ID_TBL, // TOP_BACK_LEFT
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MP_SPEAKER_ID_TBC, // TOP_BACK_CENTER
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MP_SPEAKER_ID_TBR, // TOP_BACK_RIGHT
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// Inofficial/libav* extensions
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MP_SPEAKER_ID_DL = 29, // STEREO_LEFT (stereo downmix special speakers)
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MP_SPEAKER_ID_DR, // STEREO_RIGHT
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MP_SPEAKER_ID_WL, // WIDE_LEFT
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MP_SPEAKER_ID_WR, // WIDE_RIGHT
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MP_SPEAKER_ID_SDL, // SURROUND_DIRECT_LEFT
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MP_SPEAKER_ID_SDR, // SURROUND_DIRECT_RIGHT
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MP_SPEAKER_ID_LFE2, // LOW_FREQUENCY_2
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// Special mpv-specific speaker entries reserved for channels which have no
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// known meaning.
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MP_SPEAKER_ID_UNKNOWN0 = 64,
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MP_SPEAKER_ID_UNKNOWN_LAST = MP_SPEAKER_ID_UNKNOWN0 + MP_NUM_CHANNELS - 1,
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// Including the unassigned IDs in between. This is not a valid ID anymore,
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// but is still within uint8_t.
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MP_SPEAKER_ID_COUNT,
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};
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struct mp_chmap {
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uint8_t num; // number of channels
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// Given a channel n, speaker[n] is the speaker ID driven by that channel.
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// Entries after speaker[num - 1] are undefined.
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uint8_t speaker[MP_NUM_CHANNELS];
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};
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#define MP_SP(speaker) MP_SPEAKER_ID_ ## speaker
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#define MP_CHMAP2(a, b) \
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{2, {MP_SP(a), MP_SP(b)}}
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#define MP_CHMAP3(a, b, c) \
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{3, {MP_SP(a), MP_SP(b), MP_SP(c)}}
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#define MP_CHMAP4(a, b, c, d) \
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{4, {MP_SP(a), MP_SP(b), MP_SP(c), MP_SP(d)}}
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#define MP_CHMAP5(a, b, c, d, e) \
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{5, {MP_SP(a), MP_SP(b), MP_SP(c), MP_SP(d), MP_SP(e)}}
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#define MP_CHMAP6(a, b, c, d, e, f) \
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{6, {MP_SP(a), MP_SP(b), MP_SP(c), MP_SP(d), MP_SP(e), MP_SP(f)}}
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#define MP_CHMAP7(a, b, c, d, e, f, g) \
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{7, {MP_SP(a), MP_SP(b), MP_SP(c), MP_SP(d), MP_SP(e), MP_SP(f), MP_SP(g)}}
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#define MP_CHMAP8(a, b, c, d, e, f, g, h) \
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{8, {MP_SP(a), MP_SP(b), MP_SP(c), MP_SP(d), MP_SP(e), MP_SP(f), MP_SP(g), MP_SP(h)}}
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#define MP_CHMAP_INIT_MONO {1, {MP_SPEAKER_ID_FC}}
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#define MP_CHMAP_INIT_STEREO MP_CHMAP2(FL, FR)
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bool mp_chmap_is_valid(const struct mp_chmap *src);
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bool mp_chmap_is_empty(const struct mp_chmap *src);
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bool mp_chmap_is_unknown(const struct mp_chmap *src);
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bool mp_chmap_equals(const struct mp_chmap *a, const struct mp_chmap *b);
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bool mp_chmap_equals_reordered(const struct mp_chmap *a, const struct mp_chmap *b);
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bool mp_chmap_is_compatible(const struct mp_chmap *a, const struct mp_chmap *b);
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bool mp_chmap_is_stereo(const struct mp_chmap *src);
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void mp_chmap_reorder_norm(struct mp_chmap *map);
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void mp_chmap_from_channels(struct mp_chmap *dst, int num_channels);
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void mp_chmap_set_unknown(struct mp_chmap *dst, int num_channels);
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void mp_chmap_from_channels_alsa(struct mp_chmap *dst, int num_channels);
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void mp_chmap_remove_useless_channels(struct mp_chmap *map,
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const struct mp_chmap *requested);
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uint64_t mp_chmap_to_lavc(const struct mp_chmap *src);
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uint64_t mp_chmap_to_lavc_unchecked(const struct mp_chmap *src);
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void mp_chmap_from_lavc(struct mp_chmap *dst, uint64_t src);
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bool mp_chmap_is_lavc(const struct mp_chmap *src);
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void mp_chmap_reorder_to_lavc(struct mp_chmap *map);
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void mp_chmap_get_reorder(int dst[MP_NUM_CHANNELS], const struct mp_chmap *from,
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const struct mp_chmap *to);
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void mp_chmap_diff(const struct mp_chmap *a, const struct mp_chmap *b,
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struct mp_chmap *diff);
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bool mp_chmap_contains(const struct mp_chmap *a, const struct mp_chmap *b);
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char *mp_chmap_to_str_buf(char *buf, size_t buf_size, const struct mp_chmap *src);
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#define mp_chmap_to_str(m) mp_chmap_to_str_buf((char[64]){0}, 64, (m))
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bool mp_chmap_from_str(struct mp_chmap *dst, bstr src);
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struct mp_log;
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void mp_chmap_print_help(struct mp_log *log);
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// Use these to avoid chaos in case lavc's definition should diverge from MS.
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#define mp_chmap_to_waveext mp_chmap_to_lavc
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#define mp_chmap_from_waveext mp_chmap_from_lavc
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#define mp_chmap_is_waveext mp_chmap_is_lavc
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#define mp_chmap_reorder_to_waveext mp_chmap_reorder_to_lavc
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#endif
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