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"
26 static int dirac_header(AVFormatContext *s, int idx)
28 struct ogg *ogg = s->priv_data;
29 struct ogg_stream *os = ogg->streams + idx;
30 AVStream *st = s->streams[idx];
31 dirac_source_params source;
34 // already parsed the header
35 if (st->codec->codec_id == CODEC_ID_DIRAC)
38 init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8);
39 if (ff_dirac_parse_sequence_header(st->codec, &gb, &source) < 0)
42 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
43 st->codec->codec_id = CODEC_ID_DIRAC;
44 // dirac in ogg always stores timestamps as though the video were interlaced
45 av_set_pts_info(st, 64, st->codec->time_base.num, 2*st->codec->time_base.den);
49 // various undocument things: granule is signed (only for dirac!)
50 static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
54 struct ogg *ogg = s->priv_data;
55 struct ogg_stream *os = ogg->streams + idx;
57 unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
58 int64_t dts = (gp >> 31);
59 int64_t pts = dts + ((gp >> 9) & 0x1fff);
62 os->pflags |= AV_PKT_FLAG_KEY;
70 static int old_dirac_header(AVFormatContext *s, int idx)
72 struct ogg *ogg = s->priv_data;
73 struct ogg_stream *os = ogg->streams + idx;
74 AVStream *st = s->streams[idx];
75 uint8_t *buf = os->buf + os->pstart;
80 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
81 st->codec->codec_id = CODEC_ID_DIRAC;
82 av_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
86 static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
89 struct ogg *ogg = s->priv_data;
90 struct ogg_stream *os = ogg->streams + idx;
91 uint64_t iframe = gp >> 30;
92 uint64_t pframe = gp & 0x3fffffff;
95 os->pflags |= AV_PKT_FLAG_KEY;
97 return iframe + pframe;
100 const struct ogg_codec ff_dirac_codec = {
103 .header = dirac_header,
104 .gptopts = dirac_gptopts,
105 .granule_is_start = 1,
108 const struct ogg_codec ff_old_dirac_codec = {
111 .header = old_dirac_header,
112 .gptopts = old_dirac_gptopts,
113 .granule_is_start = 1,