modules/demux/oggseek.h

   1 /*****************************************************************************
   2  * oggseek.h : ogg seeking functions for ogg demuxer vlc
   3  *****************************************************************************
   4  * Copyright (C) 2008 - 2010 Gabriel Finch <salsaman@gmail.com>
   5  *
   6  * Authors: Gabriel Finch <salsaman@gmail.com>
   7  * adapted from: http://lives.svn.sourceforge.net/viewvc/lives/trunk/lives-plugins
   8  * /plugins/decoders/ogg_theora_decoder.c
   9  *
  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.
  14  *
  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.
  19  *
  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  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #define PAGE_HEADER_BYTES 27
  30
  31 #define OGGSEEK_BYTES_TO_READ 8500
  32
  33 /* index entries are structured as follows:
  34  *   - for theora, highest granulepos -> pagepos (bytes) where keyframe begins
  35  *  - for dirac, kframe (sync point) -> pagepos of sequence start (?)
  36  */
  37
  38 /* this is typedefed to demux_index_entry_t in ogg.h */
  39 struct oggseek_index_entry
  40 {
  41     demux_index_entry_t *p_next;
  42     demux_index_entry_t *p_prev;
  43
  44     /* value is highest granulepos for theora, sync frame for dirac */
  45     int64_t i_value;
  46     int64_t i_pagepos;
  47
  48     /* not used for theora because the granulepos tells us this */
  49     int64_t i_pagepos_end;
  50 };
  51
  52 int64_t Ogg_GetKeyframeGranule ( logical_stream_t *p_stream, int64_t i_granule );
  53 bool    Ogg_IsKeyFrame ( logical_stream_t *, ogg_packet * );
  54
  55 int64_t Oggseek_GranuleToAbsTimestamp ( logical_stream_t *p_stream, int64_t i_granule,
  56                                        bool b_presentation );
  57 int     Oggseek_BlindSeektoAbsoluteTime ( demux_t *, logical_stream_t *, int64_t, bool );
  58 int     Oggseek_BlindSeektoPosition ( demux_t *, logical_stream_t *, double f, bool );
  59 int     Oggseek_SeektoAbsolutetime ( demux_t *, logical_stream_t *, int64_t i_granulepos );
  60 const demux_index_entry_t *OggSeek_IndexAdd ( logical_stream_t *, int64_t, int64_t );
  61 void    Oggseek_ProbeEnd( demux_t * );
  62
  63 void oggseek_index_entries_free ( demux_index_entry_t * );
  64
  65 int64_t oggseek_read_page ( demux_t * );