mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
cc947f04cc
Patch by Jean-Daniel Dupas, devlists shadowlab org Originally committed as revision 22744 to svn://svn.ffmpeg.org/ffmpeg/trunk
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2008 David Conrad
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavcodec/get_bits.h"
|
|
#include "libavcodec/dirac.h"
|
|
#include "avformat.h"
|
|
#include "oggdec.h"
|
|
|
|
static int dirac_header(AVFormatContext *s, int idx)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
AVStream *st = s->streams[idx];
|
|
dirac_source_params source;
|
|
GetBitContext gb;
|
|
|
|
// already parsed the header
|
|
if (st->codec->codec_id == CODEC_ID_DIRAC)
|
|
return 0;
|
|
|
|
init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8);
|
|
if (ff_dirac_parse_sequence_header(st->codec, &gb, &source) < 0)
|
|
return -1;
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_DIRAC;
|
|
// dirac in ogg always stores timestamps as though the video were interlaced
|
|
st->time_base = (AVRational){st->codec->time_base.num, 2*st->codec->time_base.den};
|
|
return 1;
|
|
}
|
|
|
|
// various undocument things: granule is signed (only for dirac!)
|
|
static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
|
|
int64_t *dts_out)
|
|
{
|
|
int64_t gp = granule;
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
|
|
unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
|
|
int64_t dts = (gp >> 31);
|
|
int64_t pts = dts + ((gp >> 9) & 0x1fff);
|
|
|
|
if (!dist)
|
|
os->pflags |= AV_PKT_FLAG_KEY;
|
|
|
|
if (dts_out)
|
|
*dts_out = dts;
|
|
|
|
return pts;
|
|
}
|
|
|
|
static int old_dirac_header(AVFormatContext *s, int idx)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
AVStream *st = s->streams[idx];
|
|
uint8_t *buf = os->buf + os->pstart;
|
|
|
|
if (buf[0] != 'K')
|
|
return 0;
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_DIRAC;
|
|
st->time_base.den = AV_RB32(buf+8);
|
|
st->time_base.num = AV_RB32(buf+12);
|
|
return 1;
|
|
}
|
|
|
|
static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
|
|
int64_t *dts)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
uint64_t iframe = gp >> 30;
|
|
uint64_t pframe = gp & 0x3fffffff;
|
|
|
|
if (!pframe)
|
|
os->pflags |= AV_PKT_FLAG_KEY;
|
|
|
|
return iframe + pframe;
|
|
}
|
|
|
|
const struct ogg_codec ff_dirac_codec = {
|
|
.magic = "BBCD\0",
|
|
.magicsize = 5,
|
|
.header = dirac_header,
|
|
.gptopts = dirac_gptopts,
|
|
.granule_is_start = 1,
|
|
};
|
|
|
|
const struct ogg_codec ff_old_dirac_codec = {
|
|
.magic = "KW-DIRAC",
|
|
.magicsize = 8,
|
|
.header = old_dirac_header,
|
|
.gptopts = old_dirac_gptopts,
|
|
.granule_is_start = 1,
|
|
};
|