path: root/libavformat/oggparsedirac.c (plain)
blob: 74b9ba4f8be90cf65aa51229eccc5308a1ede3a8

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 "libavutil/imgutils.h"
22	#include "libavutil/intreadwrite.h"
23	#include "libavcodec/dirac.h"
24	#include "avformat.h"
25	#include "internal.h"
26	#include "oggdec.h"
27
28	static int dirac_header(AVFormatContext *s, int idx)
29	{
30	struct ogg *ogg = s->priv_data;
31	struct ogg_stream *os = ogg->streams + idx;
32	AVStream *st = s->streams[idx];
33	AVDiracSeqHeader *dsh;
34	int ret;
35
36	// already parsed the header
37	if (st->codecpar->codec_id == AV_CODEC_ID_DIRAC)
38	return 0;
39
40	ret = av_dirac_parse_sequence_header(&dsh, os->buf + os->pstart + 13, (os->psize - 13), s);
41	if (ret < 0)
42	return ret;
43
44	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
45	st->codecpar->codec_id = AV_CODEC_ID_DIRAC;
46	st->codecpar->width = dsh->width;
47	st->codecpar->height = dsh->height;
48	st->codecpar->format = dsh->pix_fmt;
49	st->codecpar->color_range = dsh->color_range;
50	st->codecpar->color_trc = dsh->color_trc;
51	st->codecpar->color_primaries = dsh->color_primaries;
52	st->codecpar->color_space = dsh->colorspace;
53	st->codecpar->profile = dsh->profile;
54	st->codecpar->level = dsh->level;
55	if (av_image_check_sar(st->codecpar->width, st->codecpar->height, dsh->sample_aspect_ratio) >= 0)
56	st->sample_aspect_ratio = dsh->sample_aspect_ratio;
57
58	// Dirac in Ogg always stores timestamps as though the video were interlaced
59	avpriv_set_pts_info(st, 64, dsh->framerate.den, 2 * dsh->framerate.num);
60
61	av_freep(&dsh);
62	return 1;
63	}
64
65	// various undocumented things: granule is signed (only for Dirac!)
66	static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
67	int64_t *dts_out)
68	{
69	int64_t gp = granule;
70	struct ogg *ogg = s->priv_data;
71	struct ogg_stream *os = ogg->streams + idx;
72
73	unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
74	int64_t dts = (gp >> 31);
75	int64_t pts = dts + ((gp >> 9) & 0x1fff);
76
77	if (!dist)
78	os->pflags |= AV_PKT_FLAG_KEY;
79
80	if (dts_out)
81	*dts_out = dts;
82
83	return pts;
84	}
85
86	static int old_dirac_header(AVFormatContext *s, int idx)
87	{
88	struct ogg *ogg = s->priv_data;
89	struct ogg_stream *os = ogg->streams + idx;
90	AVStream *st = s->streams[idx];
91	uint8_t *buf = os->buf + os->pstart;
92
93	if (buf[0] != 'K')
94	return 0;
95
96	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
97	st->codecpar->codec_id = AV_CODEC_ID_DIRAC;
98	avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
99	return 1;
100	}
101
102	static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
103	int64_t *dts)
104	{
105	struct ogg *ogg = s->priv_data;
106	struct ogg_stream *os = ogg->streams + idx;
107	uint64_t iframe = gp >> 30;
108	uint64_t pframe = gp & 0x3fffffff;
109
110	if (!pframe)
111	os->pflags |= AV_PKT_FLAG_KEY;
112
113	return iframe + pframe;
114	}
115
116	const struct ogg_codec ff_dirac_codec = {
117	.magic = "BBCD\0",
118	.magicsize = 5,
119	.header = dirac_header,
120	.gptopts = dirac_gptopts,
121	.granule_is_start = 1,
122	.nb_header = 1,
123	};
124
125	const struct ogg_codec ff_old_dirac_codec = {
126	.magic = "KW-DIRAC",
127	.magicsize = 8,
128	.header = old_dirac_header,
129	.gptopts = old_dirac_gptopts,
130	.granule_is_start = 1,
131	.nb_header = 1,
132	};
133