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libavformat
oggparsedirac.c
Go to the documentation of this file.
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/*
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* Copyright (C) 2008 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* 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
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
libavcodec/get_bits.h
"
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#include "
libavcodec/dirac.h
"
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#include "
avformat.h
"
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#include "
internal.h
"
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#include "
oggdec.h
"
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static
int
dirac_header
(
AVFormatContext
*
s
,
int
idx)
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{
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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AVStream
*st = s->
streams
[idx];
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dirac_source_params
source;
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GetBitContext
gb;
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// already parsed the header
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if
(st->
codec
->
codec_id
==
AV_CODEC_ID_DIRAC
)
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return
0;
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init_get_bits
(&gb, os->
buf
+ os->
pstart
+ 13, (os->
psize
- 13) * 8);
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if
(
avpriv_dirac_parse_sequence_header
(st->
codec
, &gb, &source) < 0)
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return
-1;
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_VIDEO
;
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st->
codec
->
codec_id
=
AV_CODEC_ID_DIRAC
;
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// dirac in ogg always stores timestamps as though the video were interlaced
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avpriv_set_pts_info
(st, 64, st->
codec
->
time_base
.
num
, 2*st->
codec
->
time_base
.
den
);
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return
1;
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}
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// various undocument things: granule is signed (only for dirac!)
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static
uint64_t
dirac_gptopts
(
AVFormatContext
*
s
,
int
idx, uint64_t
granule
,
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int64_t *dts_out)
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{
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int64_t
gp
=
granule
;
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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unsigned
dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
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int64_t dts = (gp >> 31);
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int64_t pts = dts + ((gp >> 9) & 0x1fff);
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if
(!dist)
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os->
pflags
|=
AV_PKT_FLAG_KEY
;
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if
(dts_out)
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*dts_out = dts;
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return
pts;
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}
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static
int
old_dirac_header
(
AVFormatContext
*
s
,
int
idx)
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{
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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AVStream
*st = s->
streams
[idx];
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uint8_t
*
buf
= os->
buf
+ os->
pstart
;
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if
(buf[0] !=
'K'
)
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return
0;
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_VIDEO
;
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st->
codec
->
codec_id
=
AV_CODEC_ID_DIRAC
;
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avpriv_set_pts_info
(st, 64,
AV_RB32
(buf+12),
AV_RB32
(buf+8));
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return
1;
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}
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static
uint64_t
old_dirac_gptopts
(
AVFormatContext
*
s
,
int
idx, uint64_t
gp
,
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int64_t *dts)
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{
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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uint64_t iframe = gp >> 30;
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uint64_t pframe = gp & 0x3fffffff;
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if
(!pframe)
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os->
pflags
|=
AV_PKT_FLAG_KEY
;
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return
iframe + pframe;
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}
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const
struct
ogg_codec
ff_dirac_codec
= {
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.
magic
=
"BBCD\0"
,
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.magicsize = 5,
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.header =
dirac_header
,
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.gptopts =
dirac_gptopts
,
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.granule_is_start = 1,
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.nb_header = 1,
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};
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const
struct
ogg_codec
ff_old_dirac_codec
= {
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.
magic
=
"KW-DIRAC"
,
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.magicsize = 8,
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.header =
old_dirac_header
,
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.gptopts =
old_dirac_gptopts
,
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.granule_is_start = 1,
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.nb_header = 1,
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};
Generated on Sat Jan 25 2014 19:52:04 for FFmpeg by
1.8.2