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mirror of https://github.com/mpv-player/mpv synced 2024-11-03 03:19:24 +01:00
mpv/demux/packet.h
wm4 0af5335383 Rewrite ordered chapters and timeline stuff
This uses a different method to piece segments together. The old
approach basically changes to a new file (with a new start offset) any
time a segment ends. This meant waiting for audio/video end on segment
end, and then changing to the new segment all at once. It had a very
weird impact on the playback core, and some things (like truly gapless
segment transitions, or frame backstepping) just didn't work.

The new approach adds the demux_timeline pseudo-demuxer, which presents
an uniform packet stream from the many segments. This is pretty similar
to how ordered chapters are implemented everywhere else. It also reminds
of the FFmpeg concat pseudo-demuxer.

The "pure" version of this approach doesn't work though. Segments can
actually have different codec configurations (different extradata), and
subtitles are most likely broken too. (Subtitles have multiple corner
cases which break the pure stream-concatenation approach completely.)

To counter this, we do two things:
- Reinit the decoder with each segment. We go as far as allowing
  concatenating files with completely different codecs for the sake
  of EDL (which also uses the timeline infrastructure). A "lighter"
  approach would try to make use of decoder mechanism to update e.g.
  the extradata, but that seems fragile.
- Clip decoded data to segment boundaries. This is equivalent to
  normal playback core mechanisms like hr-seek, but now the playback
  core doesn't need to care about these things.

These two mechanisms are equivalent to what happened in the old
implementation, except they don't happen in the playback core anymore.
In other words, the playback core is completely relieved from timeline
implementation details. (Which honestly is exactly what I'm trying to
do here. I don't think ordered chapter behavior deserves improvement,
even if it's bad - but I want to get it out from the playback core.)

There is code duplication between audio and video decoder common code.
This is awful and could be shareable - but this will happen later.

Note that the audio path has some code to clip audio frames for the
purpose of codec preroll/gapless handling, but it's not shared as
sharing it would cause more pain than it would help.
2016-02-15 21:04:07 +01:00

60 lines
1.9 KiB
C

/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MPLAYER_DEMUX_PACKET_H
#define MPLAYER_DEMUX_PACKET_H
#include <stdbool.h>
#include <stddef.h>
#include <inttypes.h>
// Holds one packet/frame/whatever
typedef struct demux_packet {
int len;
unsigned char *buffer;
double pts;
double dts;
double duration;
bool keyframe;
int64_t pos; // position in source file byte stream
int stream; // source stream index
// segmentation (ordered chapters, EDL)
struct mp_codec_params *codec;
double start, end;
bool new_segment;
// private
struct demux_packet *next;
struct AVPacket *avpacket; // keep the buffer allocation and sidedata
} demux_packet_t;
struct demux_packet *new_demux_packet(size_t len);
struct demux_packet *new_demux_packet_from_avpacket(struct AVPacket *avpkt);
struct demux_packet *new_demux_packet_from(void *data, size_t len);
void demux_packet_shorten(struct demux_packet *dp, size_t len);
void free_demux_packet(struct demux_packet *dp);
struct demux_packet *demux_copy_packet(struct demux_packet *dp);
void demux_packet_copy_attribs(struct demux_packet *dst, struct demux_packet *src);
int demux_packet_set_padding(struct demux_packet *dp, int start, int end);
#endif /* MPLAYER_DEMUX_PACKET_H */