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https://github.com/mpv-player/mpv
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bd5a02d080
This is another attempt at making files with sparse video frames work better. The problem is that you generally can't know whether a jump in video timestamps is just a (very) long video frame, or a timestamp reset. Due to the existence of files with sparse video frames (new frame only every few seconds or longer), every heuristic will be arbitrary (in general, at least). But we can use the fact that if video is continuous, audio should also be continuous. Audio discontinuities can be easily detected, and if that happens, reset some of the playback state. The way the playback state is reset is rather radical (resets decoders as well), but it's just better not to cause too much obscure stuff to happen here. If the A/V sync code were to be rewritten, it should probably strictly use PTS values (not this strange time_frame/delay stuff), which would make it much easier to detect such situations and to react to them.
71 lines
2.1 KiB
C
71 lines
2.1 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 MPLAYER_DEC_AUDIO_H
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#define MPLAYER_DEC_AUDIO_H
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#include "audio/chmap.h"
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#include "audio/audio.h"
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#include "demux/demux.h"
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#include "demux/stheader.h"
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struct mp_audio_buffer;
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struct mp_decoder_list;
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struct dec_audio {
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struct mp_log *log;
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struct MPOpts *opts;
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struct mpv_global *global;
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bool spdif_passthrough, spdif_failed;
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const struct ad_functions *ad_driver;
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struct sh_stream *header;
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struct af_stream *afilter;
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char *decoder_desc;
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int init_retries;
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struct mp_audio_pool *pool;
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struct mp_audio decode_format;
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struct mp_audio *waiting; // used on format-change
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// set by decoder
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int bitrate; // input bitrate, can change with VBR sources
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// last known pts value in output from decoder
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double pts;
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// number of samples output by decoder after last known pts
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int pts_offset;
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// set every time a jump in timestamps is encountered
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bool pts_reset;
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// For free use by the ad_driver
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void *priv;
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};
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enum {
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AD_OK = 0,
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AD_ERR = -1,
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AD_EOF = -2,
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AD_NEW_FMT = -3,
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AD_WAIT = -4,
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};
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struct mp_decoder_list *audio_decoder_list(void);
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int audio_init_best_codec(struct dec_audio *d_audio);
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int audio_decode(struct dec_audio *d_audio, struct mp_audio_buffer *outbuf,
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int minsamples);
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int initial_audio_decode(struct dec_audio *d_audio);
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void audio_reset_decoding(struct dec_audio *d_audio);
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void audio_uninit(struct dec_audio *d_audio);
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#endif /* MPLAYER_DEC_AUDIO_H */
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