1 /*****************************************************************************
2 * ogg.h : ogg stream demux module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2010 VLC authors and VideoLAN
6 * Authors: Gildas Bazin <gbazin@netcourrier.com>
7 * Andre Pang <Andre.Pang@csiro.au> (Annodex support)
8 * Gabriel Finch <salsaman@gmail.com> (moved from ogg.c to ogg.h)
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
26 * Definitions of structures and functions used by this plugin
27 *****************************************************************************/
29 typedef struct oggseek_index_entry demux_index_entry_t;
31 typedef struct logical_stream_s
33 ogg_stream_state os; /* logical stream of packets */
36 es_format_t fmt_old; /* format of old ES is reused */
42 /* the header of some logical streams (eg vorbis) contain essential
43 * data for the decoder. We back them up here in case we need to re-feed
44 * them to the decoder. */
49 ogg_int64_t i_previous_granulepos;
51 /* program clock reference (in units of 90kHz) derived from the previous
54 mtime_t i_interpolated_pcr;
55 mtime_t i_previous_pcr;
61 /* Opus has a starting offset in the headers. */
63 /* Vorbis and Opus can trim the end of a stream using granule positions. */
66 /* offset of first keyframe for theora; can be 0 or 1 depending on version number */
67 int64_t i_keyframe_offset;
69 /* keyframe index for seeking, created as we discover keyframes */
70 demux_index_entry_t *idx;
72 /* skip some frames after a seek */
75 /* data start offset (absolute) in bytes */
78 /* kate streams have the number of headers in the ID header */
79 int i_kate_num_headers;
81 /* for Annodex logical bitstreams */
82 int i_secondary_header_packets;
88 ogg_sync_state oy; /* sync and verify incoming physical bitstream */
90 int i_streams; /* number of logical bitstreams */
91 logical_stream_t **pp_stream; /* pointer to an array of logical streams */
93 logical_stream_t *p_old_stream; /* pointer to a old logical stream to avoid recreating it */
95 /* program clock reference (in units of 90kHz) derived from the pcr of
100 int i_bos; /* Begnning of stream, tell the demux to look for elementary streams. */
106 /* after reading all headers, the first data page is stuffed into the relevant stream, ready to use */
109 /* count of total frames in video stream */
110 int64_t i_total_frames;
112 /* length of file in bytes */
113 int64_t i_total_length;
115 /* offset position in file (for reading) */
116 int64_t i_input_position;
118 /* current page being parsed */
119 ogg_page current_page;
124 seekpoint_t **pp_seekpoints;
128 input_attachment_t **attachments;
130 /* Length, if available. */