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/*****************************************************************************
* oggseek.h : ogg seeking functions for ogg demuxer vlc
*****************************************************************************
* Copyright (C) 2008 - 2010 Gabriel Finch <salsaman@gmail.com>
*
* Authors: Gabriel Finch <salsaman@gmail.com>
* adapted from: http://lives.svn.sourceforge.net/viewvc/lives/trunk/lives-plugins
* /plugins/decoders/ogg_theora_decoder.c
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#define PAGE_HEADER_BYTES 27
#define OGGSEEK_BYTES_TO_READ 8500
/* index entries are structured as follows:
* - for theora, highest granulepos -> pagepos (bytes) where keyframe begins
* - for dirac, kframe (sync point) -> pagepos of sequence start (?)
*/
/* this is typedefed to demux_index_entry_t in ogg.h */
struct oggseek_index_entry
{
demux_index_entry_t *p_next;
demux_index_entry_t *p_prev;
/* value is highest granulepos for theora, sync frame for dirac */
int64_t i_value;
int64_t i_pagepos;
/* not used for theora because the granulepos tells us this */
int64_t i_pagepos_end;
};
int64_t Ogg_GetKeyframeGranule ( logical_stream_t *p_stream, int64_t i_granule );
bool Ogg_IsKeyFrame ( logical_stream_t *, ogg_packet * );
int64_t Oggseek_GranuleToAbsTimestamp ( logical_stream_t *p_stream, int64_t i_granule,
bool b_presentation );
int Oggseek_BlindSeektoAbsoluteTime ( demux_t *, logical_stream_t *, int64_t, bool );
int Oggseek_BlindSeektoPosition ( demux_t *, logical_stream_t *, double f, bool );
int Oggseek_SeektoAbsolutetime ( demux_t *, logical_stream_t *, int64_t i_granulepos );
const demux_index_entry_t *OggSeek_IndexAdd ( logical_stream_t *, int64_t, int64_t );
void Oggseek_ProbeEnd( demux_t * );
void oggseek_index_entries_free ( demux_index_entry_t * );
int64_t oggseek_read_page ( demux_t * );
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