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/*
* 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 = CODEC_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, int64_t gp)
{
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 |= PKT_FLAG_KEY;
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 = CODEC_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)
{
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 |= 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,
};
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