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
28static 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!)
66static 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
86static 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
102static 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
116const 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
125const 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