Fix warning about incompatible pointer types
[libav.git] / libavformat / oggparsedirac.c
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1/*
2 * Copyright (C) 2008 David Conrad
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include "libavcodec/get_bits.h"
22#include "libavcodec/dirac.h"
23#include "avformat.h"
24#include "oggdec.h"
25
26static int dirac_header(AVFormatContext *s, int idx)
27{
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;
32 GetBitContext gb;
33
34 // already parsed the header
35 if (st->codec->codec_id == CODEC_ID_DIRAC)
36 return 0;
37
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)
40 return -1;
41
42 st->codec->codec_type = CODEC_TYPE_VIDEO;
43 st->codec->codec_id = CODEC_ID_DIRAC;
44 // dirac in ogg always stores timestamps as though the video were interlaced
45 st->time_base = (AVRational){st->codec->time_base.num, 2*st->codec->time_base.den};
46 return 1;
47}
48
49// various undocument things: granule is signed (only for dirac!)
148e8f2d 50static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
2d4970d8 51 int64_t *dts_out)
24ca518b 52{
148e8f2d 53 int64_t gp = granule;
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54 struct ogg *ogg = s->priv_data;
55 struct ogg_stream *os = ogg->streams + idx;
56
57 unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
58 int64_t dts = (gp >> 31);
59 int64_t pts = dts + ((gp >> 9) & 0x1fff);
60
61 if (!dist)
62 os->pflags |= PKT_FLAG_KEY;
63
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64 if (dts_out)
65 *dts_out = dts;
66
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67 return pts;
68}
69
70static int old_dirac_header(AVFormatContext *s, int idx)
71{
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;
76
77 if (buf[0] != 'K')
78 return 0;
79
80 st->codec->codec_type = CODEC_TYPE_VIDEO;
81 st->codec->codec_id = CODEC_ID_DIRAC;
82 st->time_base.den = AV_RB32(buf+8);
83 st->time_base.num = AV_RB32(buf+12);
84 return 1;
85}
86
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87static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
88 int64_t *dts)
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89{
90 struct ogg *ogg = s->priv_data;
91 struct ogg_stream *os = ogg->streams + idx;
92 uint64_t iframe = gp >> 30;
93 uint64_t pframe = gp & 0x3fffffff;
94
95 if (!pframe)
96 os->pflags |= PKT_FLAG_KEY;
97
98 return iframe + pframe;
99}
100
101const struct ogg_codec ff_dirac_codec = {
102 .magic = "BBCD\0",
103 .magicsize = 5,
104 .header = dirac_header,
105 .gptopts = dirac_gptopts,
106 .granule_is_start = 1,
107};
108
109const struct ogg_codec ff_old_dirac_codec = {
110 .magic = "KW-DIRAC",
111 .magicsize = 8,
112 .header = old_dirac_header,
113 .gptopts = old_dirac_gptopts,
114 .granule_is_start = 1,
115};