2 * Copyright (C) 2008 David Conrad
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavcodec/get_bits.h"
22 #include "libavcodec/dirac.h"
27 static int dirac_header(AVFormatContext *s, int idx)
29 struct ogg *ogg = s->priv_data;
30 struct ogg_stream *os = ogg->streams + idx;
31 AVStream *st = s->streams[idx];
32 dirac_source_params source;
33 DiracVersionInfo version;
37 // already parsed the header
38 if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
41 ret = init_get_bits8(&gb, os->buf + os->pstart + 13, (os->psize - 13));
45 ret = avpriv_dirac_parse_sequence_header(st->codec, &gb, &source, &version,
50 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
51 st->codec->codec_id = AV_CODEC_ID_DIRAC;
52 // dirac in ogg always stores timestamps as though the video were interlaced
53 avpriv_set_pts_info(st, 64, st->codec->framerate.den, 2*st->codec->framerate.num);
57 // various undocument things: granule is signed (only for dirac!)
58 static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
62 struct ogg *ogg = s->priv_data;
63 struct ogg_stream *os = ogg->streams + idx;
65 unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
66 int64_t dts = (gp >> 31);
67 int64_t pts = dts + ((gp >> 9) & 0x1fff);
70 os->pflags |= AV_PKT_FLAG_KEY;
78 static int old_dirac_header(AVFormatContext *s, int idx)
80 struct ogg *ogg = s->priv_data;
81 struct ogg_stream *os = ogg->streams + idx;
82 AVStream *st = s->streams[idx];
83 uint8_t *buf = os->buf + os->pstart;
88 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
89 st->codec->codec_id = AV_CODEC_ID_DIRAC;
90 avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
94 static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
97 struct ogg *ogg = s->priv_data;
98 struct ogg_stream *os = ogg->streams + idx;
99 uint64_t iframe = gp >> 30;
100 uint64_t pframe = gp & 0x3fffffff;
103 os->pflags |= AV_PKT_FLAG_KEY;
105 return iframe + pframe;
108 const struct ogg_codec ff_dirac_codec = {
111 .header = dirac_header,
112 .gptopts = dirac_gptopts,
113 .granule_is_start = 1,
117 const struct ogg_codec ff_old_dirac_codec = {
120 .header = old_dirac_header,
121 .gptopts = old_dirac_gptopts,
122 .granule_is_start = 1,