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;
36 // already parsed the header
37 if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
40 ret = init_get_bits8(&gb, os->buf + os->pstart + 13, (os->psize - 13));
44 ret = avpriv_dirac_parse_sequence_header(st->codec, &gb, &source);
48 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
49 st->codec->codec_id = AV_CODEC_ID_DIRAC;
50 // dirac in ogg always stores timestamps as though the video were interlaced
51 avpriv_set_pts_info(st, 64, st->codec->framerate.den, 2*st->codec->framerate.num);
55 // various undocument things: granule is signed (only for dirac!)
56 static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
60 struct ogg *ogg = s->priv_data;
61 struct ogg_stream *os = ogg->streams + idx;
63 unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
64 int64_t dts = (gp >> 31);
65 int64_t pts = dts + ((gp >> 9) & 0x1fff);
68 os->pflags |= AV_PKT_FLAG_KEY;
76 static int old_dirac_header(AVFormatContext *s, int idx)
78 struct ogg *ogg = s->priv_data;
79 struct ogg_stream *os = ogg->streams + idx;
80 AVStream *st = s->streams[idx];
81 uint8_t *buf = os->buf + os->pstart;
86 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
87 st->codec->codec_id = AV_CODEC_ID_DIRAC;
88 avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
92 static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
95 struct ogg *ogg = s->priv_data;
96 struct ogg_stream *os = ogg->streams + idx;
97 uint64_t iframe = gp >> 30;
98 uint64_t pframe = gp & 0x3fffffff;
101 os->pflags |= AV_PKT_FLAG_KEY;
103 return iframe + pframe;
106 const struct ogg_codec ff_dirac_codec = {
109 .header = dirac_header,
110 .gptopts = dirac_gptopts,
111 .granule_is_start = 1,
115 const struct ogg_codec ff_old_dirac_codec = {
118 .header = old_dirac_header,
119 .gptopts = old_dirac_gptopts,
120 .granule_is_start = 1,