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5f631d1c08
Add a new EBML parser implementation that should allow significant improvements to the Matroska demuxer. The new parsing code is not actually used yet by the demuxer. The only changes to existing code in this commit are to generate the MATROSKA_ID_* / EBML_ID_* macro definitions from the new implementation and to rename some of them (the new implementation uses names matching the official Matroska spec). The main parser implementation is added in ebml.c. There are two new generated files, ebml_defs.c and ebml_types.h, that contain definitions of EBML elements. Those are generated by the new script TOOLS/matroska.py. There's a new Makefile target "generated_ebml" that run the script to refresh the content of the generated files.
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer 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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* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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/* 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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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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struct bstr {
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uint8_t *start;
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int len;
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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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/* matroska subtitle types */
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#define MATROSKA_SUBTYPE_UNKNOWN 0
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#define MATROSKA_SUBTYPE_TEXT 1
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#define MATROSKA_SUBTYPE_SSA 2
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#define MATROSKA_SUBTYPE_VOBSUB 3
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#ifndef UINT64_MAX
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#define UINT64_MAX 18446744073709551615ULL
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#endif
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#ifndef INT64_MAX
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#define INT64_MAX 9223372036854775807LL
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#endif
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#define EBML_UINT_INVALID UINT64_MAX
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#define EBML_INT_INVALID INT64_MAX
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#define EBML_FLOAT_INVALID -1000000000.0
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uint32_t ebml_read_id (stream_t *s, int *length);
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uint64_t ebml_read_vlen_uint (uint8_t *buffer, int *length);
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int64_t ebml_read_vlen_int (uint8_t *buffer, int *length);
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uint64_t ebml_read_length (stream_t *s, int *length);
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uint64_t ebml_read_uint (stream_t *s, uint64_t *length);
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int64_t ebml_read_int (stream_t *s, uint64_t *length);
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long double ebml_read_float (stream_t *s, uint64_t *length);
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char *ebml_read_ascii (stream_t *s, uint64_t *length);
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char *ebml_read_utf8 (stream_t *s, uint64_t *length);
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int ebml_read_skip (stream_t *s, uint64_t *length);
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uint32_t ebml_read_master (stream_t *s, uint64_t *length);
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char *ebml_read_header (stream_t *s, int *version);
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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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