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https://github.com/mpv-player/mpv
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ab8f28a672
The point is selecting a minimal fallback. The AOs will call this through the AO API, so it will be possible to add options affecting the general channel layout selection. It provides the following mechanism to AOs: - forcing the correct channel order - downmixing to stereo if no layout is available - allow 5.1 <-> 5.1(side) fallback - handling "unknown" channel layouts This is quite weak and lots of code/complexity for little gain. All AOs already made sure the channel order was correct, and the fallback is of little value, and could perhaps be done in the frontend instead, like stereo downmixing with --channels=2 is handled. But I'm not really sure how this stuff should _really_ work, and the new code will hopefully provides enough flexibility to make radical changes to channel layout negotiation easier.
77 lines
2.3 KiB
C
77 lines
2.3 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 <assert.h>
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#include "core/mp_talloc.h"
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#include "audio.h"
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void mp_audio_set_format(struct mp_audio *mpa, int format)
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{
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mpa->format = format;
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mpa->bps = af_fmt2bits(format) / 8;
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}
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void mp_audio_set_num_channels(struct mp_audio *mpa, int num_channels)
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{
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struct mp_chmap map;
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mp_chmap_from_channels(&map, num_channels);
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mp_audio_set_channels(mpa, &map);
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}
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// Use old MPlayer/ALSA channel layout.
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void mp_audio_set_channels_old(struct mp_audio *mpa, int num_channels)
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{
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struct mp_chmap map;
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mp_chmap_from_channels_alsa(&map, num_channels);
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mp_audio_set_channels(mpa, &map);
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}
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void mp_audio_set_channels(struct mp_audio *mpa, const struct mp_chmap *chmap)
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{
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assert(mp_chmap_is_empty(chmap) || mp_chmap_is_valid(chmap));
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mpa->channels = *chmap;
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mpa->nch = mpa->channels.num;
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}
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void mp_audio_copy_config(struct mp_audio *dst, const struct mp_audio *src)
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{
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mp_audio_set_format(dst, src->format);
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mp_audio_set_channels(dst, &src->channels);
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dst->rate = src->rate;
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}
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bool mp_audio_config_equals(const struct mp_audio *a, const struct mp_audio *b)
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{
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return a->format == b->format && a->rate == b->rate &&
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mp_chmap_equals(&a->channels, &b->channels);
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}
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char *mp_audio_fmt_to_str(int srate, const struct mp_chmap *chmap, int format)
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{
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char *chstr = mp_chmap_to_str(chmap);
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char *res = talloc_asprintf(NULL, "%dHz %s %dch %s", srate, chstr,
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chmap->num, af_fmt2str_short(format));
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talloc_free(chstr);
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return res;
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}
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char *mp_audio_config_to_str(struct mp_audio *mpa)
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{
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return mp_audio_fmt_to_str(mpa->rate, &mpa->channels, mpa->format);
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}
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