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199 lines
6.6 KiB
199 lines
6.6 KiB
/*****************************************************************************
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* ogg_granule.c : ogg granule functions
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*****************************************************************************
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* Copyright (C) 2008 - 2018 VideoLAN Authors and VideoLabs
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_LIBVORBIS
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#include <vorbis/codec.h>
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#endif
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#include <ogg/ogg.h>
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#include <vlc_common.h>
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#include <vlc_codecs.h>
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#include <vlc_es.h>
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#include "ogg.h"
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#include "ogg_granule.h"
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/* Theora spec 7.1 */
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#define THEORA_FTYPE_NOTDATA 0x80
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#define THEORA_FTYPE_INTERFRAME 0x40
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/* Checks if current packet matches codec keyframe */
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bool Ogg_IsKeyFrame( const logical_stream_t *p_stream, const ogg_packet *p_packet )
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{
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if ( p_stream->b_oggds )
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{
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return ( p_packet->bytes > 0 && p_packet->packet[0] & PACKET_IS_SYNCPOINT );
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}
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else switch ( p_stream->fmt.i_codec )
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{
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case VLC_CODEC_THEORA:
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case VLC_CODEC_DAALA: /* Same convention used in daala */
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if ( p_packet->bytes <= 0 || p_packet->packet[0] & THEORA_FTYPE_NOTDATA )
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return false;
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else
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return !( p_packet->packet[0] & THEORA_FTYPE_INTERFRAME );
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case VLC_CODEC_VP8:
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return ( ( ( p_packet->granulepos >> 3 ) & 0x07FFFFFF ) == 0 );
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case VLC_CODEC_DIRAC:
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if( p_stream->special.dirac.b_old )
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return (p_packet->granulepos & 0x3FFFFFFF) == 0;
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else
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return (p_packet->granulepos & 0xFF8000FF) == 0;
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default:
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return true;
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}
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}
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int64_t Ogg_GetKeyframeGranule( const logical_stream_t *p_stream, int64_t i_granule )
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{
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if ( p_stream->b_oggds )
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{
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return -1; /* We have no way to know */
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}
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else switch( p_stream->fmt.i_codec )
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{
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case VLC_CODEC_THEORA:
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case VLC_CODEC_DAALA:
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return ( i_granule >> p_stream->i_granule_shift ) << p_stream->i_granule_shift;
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case VLC_CODEC_DIRAC:
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if( p_stream->special.dirac.b_old )
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return ( i_granule >> 30 ) << 30;
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else
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return ( i_granule >> 31 ) << 31;
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default:
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/* No change, that's keyframe */
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return i_granule;
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}
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}
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static int64_t Ogg_GranuleToSampleDelta( const logical_stream_t *p_stream, int64_t i_granule )
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{
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if( p_stream->fmt.i_codec == VLC_CODEC_DIRAC && !p_stream->special.dirac.b_old )
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return (i_granule >> 9) & 0x1fff;
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else
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return -1;
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}
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static int64_t Ogg_GranuleToSample( const logical_stream_t *p_stream, int64_t i_granule )
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{
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switch( p_stream->fmt.i_codec )
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{
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case VLC_CODEC_THEORA:
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if( p_stream->i_first_frame_index == 0 && !p_stream->b_oggds )
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i_granule++;
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/* fallthrough */
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case VLC_CODEC_DAALA:
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case VLC_CODEC_KATE:
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{
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ogg_int64_t iframe = i_granule >> p_stream->i_granule_shift;
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ogg_int64_t pframe = i_granule - ( iframe << p_stream->i_granule_shift );
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return iframe + pframe;
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}
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case VLC_CODEC_VP8:
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case VLC_CODEC_OGGSPOTS:
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return i_granule >> p_stream->i_granule_shift;
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case VLC_CODEC_DIRAC:
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if( p_stream->special.dirac.b_old )
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return (i_granule >> 30) + (i_granule & 0x3FFFFFFF);
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else
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return (i_granule >> 31);
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case VLC_CODEC_OPUS:
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case VLC_CODEC_VORBIS:
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case VLC_CODEC_SPEEX:
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case VLC_CODEC_FLAC:
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return i_granule/* - p_stream->i_pre_skip*/;
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default:
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return i_granule;
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}
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}
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static int64_t Ogg_ShiftPacketSample( const logical_stream_t *p_stream,
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int64_t i_sample, bool b_start )
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{
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/* /!\ Packet Granule as sample value ! */
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/* granule always point to end time of packet
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Except with OggDS where it is reversed */
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int64_t i_endtostartoffset = 0; /* in interval # */
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if( p_stream->b_oggds )
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i_endtostartoffset = (b_start ? 0 : 1);
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else
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i_endtostartoffset = (b_start ? -1 : 0);
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if( p_stream->fmt.i_cat == VIDEO_ES )
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{
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if( p_stream->fmt.i_codec == VLC_CODEC_DIRAC ) /* points to start */
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i_sample += (p_stream->special.dirac.b_interlaced ? 1 : 2) * (i_endtostartoffset + 1);
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else
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i_sample += i_endtostartoffset * 1;
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}
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else if( p_stream->fmt.i_cat == AUDIO_ES )
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{
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if( p_stream->fmt.i_codec == VLC_CODEC_SPEEX )
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{
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i_sample += i_endtostartoffset *
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p_stream->special.speex.i_framesize *
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p_stream->special.speex.i_framesperpacket;
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}
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else /* we can't tell */
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{
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if( i_endtostartoffset != 0 )
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return -1;
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}
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}
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return i_sample;
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}
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vlc_tick_t Ogg_SampleToTime( const logical_stream_t *p_stream, int64_t i_sample, bool b_start )
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{
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i_sample = Ogg_ShiftPacketSample( p_stream, i_sample, b_start );
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if( i_sample < 0 )
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return VLC_TICK_INVALID;
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date_t d = p_stream->dts;
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date_Set(&d, VLC_TICK_0);
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return date_Increment( &d, i_sample );
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}
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bool Ogg_GranuleIsValid( const logical_stream_t *p_stream, int64_t i_granule )
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{
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/* First frame in ogm is 0 (0[header] 0[frame] -1 2 3 -1 5 ...) */
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return !( i_granule < p_stream->i_first_frame_index - !!p_stream->b_oggds );
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}
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vlc_tick_t Ogg_GranuleToTime( const logical_stream_t *p_stream, int64_t i_granule,
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bool b_start, bool b_pts )
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{
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if( !Ogg_GranuleIsValid( p_stream, i_granule ) )
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return VLC_TICK_INVALID;
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int64_t i_sample = Ogg_GranuleToSample( p_stream, i_granule );
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if( b_pts )
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{
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int64_t i_delta = Ogg_GranuleToSampleDelta( p_stream, i_granule );
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if( i_delta != -1 )
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i_sample += i_delta;
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}
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return Ogg_SampleToTime( p_stream, i_sample, b_start );
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}
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