mirror of
https://github.com/mpv-player/mpv
synced 2024-12-27 01:22:30 +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.
94 lines
2.6 KiB
C
94 lines
2.6 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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MPLAYER_EBML_H
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#define MPLAYER_EBML_H
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#include <inttypes.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include "stream/stream.h"
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#include "misc/bstr.h"
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struct mp_log;
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/* EBML version supported */
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#define EBML_VERSION 1
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enum ebml_elemtype {
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EBML_TYPE_SUBELEMENTS,
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EBML_TYPE_UINT,
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EBML_TYPE_SINT,
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EBML_TYPE_FLOAT,
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EBML_TYPE_STR,
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EBML_TYPE_BINARY,
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EBML_TYPE_EBML_ID,
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};
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struct ebml_field_desc {
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uint32_t id;
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bool multiple;
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int offset;
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int count_offset;
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const struct ebml_elem_desc *desc;
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};
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struct ebml_elem_desc {
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char *name;
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enum ebml_elemtype type;
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int size;
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int field_count;
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const struct ebml_field_desc *fields;
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};
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struct ebml_parse_ctx {
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struct mp_log *log;
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void *talloc_ctx;
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bool has_errors;
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bool no_error_messages;
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};
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#include "ebml_types.h"
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#define EBML_ID_INVALID 0xffffffff
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/* matroska track types */
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#define MATROSKA_TRACK_VIDEO 0x01 /* rectangle-shaped pictures aka video */
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#define MATROSKA_TRACK_AUDIO 0x02 /* anything you can hear */
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#define MATROSKA_TRACK_COMPLEX 0x03 /* audio+video in same track used by DV */
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#define MATROSKA_TRACK_LOGO 0x10 /* overlay-pictures displayed over video*/
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#define MATROSKA_TRACK_SUBTITLE 0x11 /* text-subtitles */
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#define MATROSKA_TRACK_CONTROL 0x20 /* control-codes for menu or other stuff*/
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#define EBML_UINT_INVALID UINT64_MAX
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#define EBML_INT_INVALID INT64_MAX
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bool ebml_is_mkv_level1_id(uint32_t id);
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uint32_t ebml_read_id (stream_t *s);
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uint64_t ebml_read_length (stream_t *s);
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int64_t ebml_read_signed_length(stream_t *s);
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uint64_t ebml_read_uint (stream_t *s);
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int64_t ebml_read_int (stream_t *s);
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int ebml_read_skip(struct mp_log *log, int64_t end, stream_t *s);
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int ebml_resync_cluster(struct mp_log *log, stream_t *s);
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int ebml_read_element(struct stream *s, struct ebml_parse_ctx *ctx,
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void *target, const struct ebml_elem_desc *desc);
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#endif /* MPLAYER_EBML_H */
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