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 //#define OGG_DEMUX_DEBUG 1
30 #ifdef OGG_DEMUX_DEBUG
31 #define DemuxDebug(code) code
33 #define DemuxDebug(code)
36 /* Some defines from OggDS http://svn.xiph.org/trunk/oggds/ */
37 #define PACKET_TYPE_HEADER 0x01
38 #define PACKET_TYPE_BITS 0x07
39 #define PACKET_LEN_BITS01 0xc0
40 #define PACKET_LEN_BITS2 0x02
41 #define PACKET_IS_SYNCPOINT 0x08
43 typedef struct oggseek_index_entry demux_index_entry_t;
44 typedef struct ogg_skeleton_t ogg_skeleton_t;
46 typedef struct logical_stream_s
48 ogg_stream_state os; /* logical stream of packets */
51 es_format_t fmt_old; /* format of old ES is reused */
57 /* the header of some logical streams (eg vorbis) contain essential
58 * data for the decoder. We back them up here in case we need to re-feed
59 * them to the decoder. */
61 bool b_have_updated_format;
63 int32_t i_extra_headers_packets;
66 ogg_int64_t i_previous_granulepos;
68 /* program clock reference (in units of 90kHz) derived from the previous
71 mtime_t i_interpolated_pcr;
72 mtime_t i_previous_pcr;
78 bool b_reusing_with_other_fmt;
82 /* Opus has a starting offset in the headers. */
84 /* Vorbis and Opus can trim the end of a stream using granule positions. */
87 /* offset of first keyframe for theora; can be 0 or 1 depending on version number */
88 int8_t i_keyframe_offset;
90 /* keyframe index for seeking, created as we discover keyframes */
91 demux_index_entry_t *idx;
94 ogg_skeleton_t *p_skel;
96 /* skip some frames after a seek */
99 /* data start offset (absolute) in bytes */
100 int64_t i_data_start;
102 /* kate streams have the number of headers in the ID header */
103 int i_kate_num_headers;
105 /* for Annodex logical bitstreams */
106 int i_secondary_header_packets;
108 block_t *p_preparse_block;
111 struct ogg_skeleton_t
114 char **ppsz_messages;
115 unsigned char *p_index;
117 uint64_t i_index_size;
118 int64_t i_indexstampden;/* time denominator */
119 int64_t i_indexfirstnum;/* first sample time numerator */
120 int64_t i_indexlastnum;
125 ogg_sync_state oy; /* sync and verify incoming physical bitstream */
127 int i_streams; /* number of logical bitstreams */
128 logical_stream_t **pp_stream; /* pointer to an array of logical streams */
129 logical_stream_t *p_skelstream; /* pointer to skeleton stream if any */
131 logical_stream_t *p_old_stream; /* pointer to a old logical stream to avoid recreating it */
133 /* program clock reference (in units of 90kHz) derived from the pcr of
137 /* new stream or starting from a chain */
138 bool b_chained_boundary;
142 bool b_partial_bitrate;
144 /* after reading all headers, the first data page is stuffed into the relevant stream, ready to use */
147 /* count of total frames in video stream */
148 int64_t i_total_frames;
150 /* length of file in bytes */
151 int64_t i_total_length;
153 /* offset position in file (for reading) */
154 int64_t i_input_position;
156 /* current page being parsed */
157 ogg_page current_page;
162 seekpoint_t **pp_seekpoints;
173 input_attachment_t **attachments;
175 /* preparsing info */
176 bool b_preparsing_done;
178 /* Length, if available. */
181 DemuxDebug( bool b_seeked; )
185 unsigned const char * Read7BitsVariableLE( unsigned const char *,
186 unsigned const char *,
188 bool Ogg_GetBoundsUsingSkeletonIndex( logical_stream_t *p_stream, int64_t i_time,
189 int64_t *pi_lower, int64_t *pi_upper );