summaryrefslogtreecommitdiffstats
path: root/libavformat/oggparsedirac.c
blob: 74b9ba4f8be90cf65aa51229eccc5308a1ede3a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
 * Copyright (C) 2008  David Conrad
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/dirac.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"

static int dirac_header(AVFormatContext *s, int idx)
{
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    AVStream *st = s->streams[idx];
    AVDiracSeqHeader *dsh;
    int ret;

    // already parsed the header
    if (st->codecpar->codec_id == AV_CODEC_ID_DIRAC)
        return 0;

    ret = av_dirac_parse_sequence_header(&dsh, os->buf + os->pstart + 13, (os->psize - 13), s);
    if (ret < 0)
        return ret;

    st->codecpar->codec_type      = AVMEDIA_TYPE_VIDEO;
    st->codecpar->codec_id        = AV_CODEC_ID_DIRAC;
    st->codecpar->width           = dsh->width;
    st->codecpar->height          = dsh->height;
    st->codecpar->format          = dsh->pix_fmt;
    st->codecpar->color_range     = dsh->color_range;
    st->codecpar->color_trc       = dsh->color_trc;
    st->codecpar->color_primaries = dsh->color_primaries;
    st->codecpar->color_space     = dsh->colorspace;
    st->codecpar->profile         = dsh->profile;
    st->codecpar->level           = dsh->level;
    if (av_image_check_sar(st->codecpar->width, st->codecpar->height, dsh->sample_aspect_ratio) >= 0)
        st->sample_aspect_ratio = dsh->sample_aspect_ratio;

    // Dirac in Ogg always stores timestamps as though the video were interlaced
    avpriv_set_pts_info(st, 64, dsh->framerate.den, 2 * dsh->framerate.num);

    av_freep(&dsh);
    return 1;
}

// various undocumented things: granule is signed (only for Dirac!)
static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
                              int64_t *dts_out)
{
    int64_t gp = granule;
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;

    unsigned dist  = ((gp >> 14) & 0xff00) | (gp & 0xff);
    int64_t  dts   = (gp >> 31);
    int64_t  pts   = dts + ((gp >> 9) & 0x1fff);

    if (!dist)
        os->pflags |= AV_PKT_FLAG_KEY;

    if (dts_out)
        *dts_out = dts;

    return pts;
}

static int old_dirac_header(AVFormatContext *s, int idx)
{
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    AVStream *st = s->streams[idx];
    uint8_t *buf = os->buf + os->pstart;

    if (buf[0] != 'K')
        return 0;

    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codecpar->codec_id = AV_CODEC_ID_DIRAC;
    avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
    return 1;
}

static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
                                  int64_t *dts)
{
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    uint64_t iframe = gp >> 30;
    uint64_t pframe = gp & 0x3fffffff;

    if (!pframe)
        os->pflags |= AV_PKT_FLAG_KEY;

    return iframe + pframe;
}

const struct ogg_codec ff_dirac_codec = {
    .magic = "BBCD\0",
    .magicsize = 5,
    .header = dirac_header,
    .gptopts = dirac_gptopts,
    .granule_is_start = 1,
    .nb_header = 1,
};

const struct ogg_codec ff_old_dirac_codec = {
    .magic = "KW-DIRAC",
    .magicsize = 8,
    .header = old_dirac_header,
    .gptopts = old_dirac_gptopts,
    .granule_is_start = 1,
    .nb_header = 1,
};
OpenPOWER on IntegriCloud