mirror of
https://github.com/mpv-player/mpv
synced 2024-12-21 06:14:32 +00:00
9e1fbffc37
This directly reads individual mkv sub-packets (block laces) into a dedicated AVBufferRefs, which can be directly used for creating packets without a additional copy of the packet data. This also means we switch parsing of block header fields and lacing metadata to read directly from the stream, instead of a memory buffer. This could have been much easier if libavcodec didn't require padding the packet data with zero bytes. We could just have each packet reference a slice of the block data. But as it is, the only way to get padding without a copy is to read the laces into individually allocated (and padded) memory block, which required a larger rewrite. This probably makes recovering from broken mkv files slightly worse if the transport is unseekable. We just read, and then check if we've overread. But I think that shouldn't be a real concern. No actual measureable performance change. Potential for some regressions, as this is quite intrusive, and touches weird obscure shit like mkv lacing. Still keeping it because I like how it removes some redundant EBML parsing functions.
67 lines
2.3 KiB
C
67 lines
2.3 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 Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 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 Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser 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)
|
|
bool segmented;
|
|
struct mp_codec_params *codec; // set to non-NULL iff segmented is set
|
|
double start, end; // set to non-NOPTS iff segmented is set
|
|
|
|
// private
|
|
struct demux_packet *next;
|
|
struct AVPacket *avpacket; // keep the buffer allocation and sidedata
|
|
double kf_seek_pts; // demux.c internal: seek pts for keyframe range
|
|
} demux_packet_t;
|
|
|
|
struct AVBufferRef;
|
|
|
|
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);
|
|
struct demux_packet *new_demux_packet_from_buf(struct AVBufferRef *buf);
|
|
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);
|
|
size_t demux_packet_estimate_total_size(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);
|
|
int demux_packet_add_blockadditional(struct demux_packet *dp, uint64_t id,
|
|
void *data, size_t size);
|
|
|
|
#endif /* MPLAYER_DEMUX_PACKET_H */
|