changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / oggparsetheora.c
CommitLineData
1ed923ea
MR
1/**
2 Copyright (C) 2005 Matthieu CASTET
3
4 Permission is hereby granted, free of charge, to any person
5 obtaining a copy of this software and associated documentation
6 files (the "Software"), to deal in the Software without
7 restriction, including without limitation the rights to use, copy,
8 modify, merge, publish, distribute, sublicense, and/or sell copies
9 of the Software, and to permit persons to whom the Software is
10 furnished to do so, subject to the following conditions:
11
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
23**/
24
25#include <stdlib.h>
26#include "avformat.h"
27#include "bitstream.h"
28#include "bswap.h"
29#include "ogg2.h"
30
31typedef struct theora_params {
32 int gpshift;
33 int gpmask;
34} theora_params_t;
35
36static int
37theora_header (AVFormatContext * s, int idx)
38{
39 ogg_t *ogg = s->priv_data;
40 ogg_stream_t *os = ogg->streams + idx;
41 AVStream *st = s->streams[idx];
42 theora_params_t *thp = os->private;
01f4895c 43 int cds = st->codec->extradata_size + os->psize + 2;
1ed923ea
MR
44 uint8_t *cdp;
45
5b558574 46 if(!(os->buf[os->pstart] & 0x80))
1ed923ea
MR
47 return 0;
48
49 if(!thp){
50 thp = av_mallocz(sizeof(*thp));
51 os->private = thp;
52 }
53
54 if (os->buf[os->pstart] == 0x80) {
55 GetBitContext gb;
56 init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
57
58 skip_bits(&gb, 7*8); /* 0x80"theora" */
5b558574
MR
59 if(get_bits(&gb, 8) != 3) /* major version */
60 return -1;
61 if(get_bits(&gb, 8) != 2) /* minor version */
62 return -1;
63 skip_bits(&gb, 8); /* revision */
64
01f4895c
MN
65 st->codec->width = get_bits(&gb, 16) << 4;
66 st->codec->height = get_bits(&gb, 16) << 4;
1ed923ea
MR
67
68 skip_bits(&gb, 64);
01f4895c
MN
69 st->codec->time_base.den = get_bits(&gb, 32);
70 st->codec->time_base.num = get_bits(&gb, 32);
1ed923ea 71
01f4895c
MN
72 st->codec->sample_aspect_ratio.num = get_bits(&gb, 24);
73 st->codec->sample_aspect_ratio.den = get_bits(&gb, 24);
1ed923ea
MR
74
75 skip_bits(&gb, 38);
76 thp->gpshift = get_bits(&gb, 5);
77 thp->gpmask = (1 << thp->gpshift) - 1;
78
01f4895c
MN
79 st->codec->codec_type = CODEC_TYPE_VIDEO;
80 st->codec->codec_id = CODEC_ID_THEORA;
1ed923ea
MR
81
82 } else if (os->buf[os->pstart] == 0x83) {
83 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
84 }
85
01f4895c
MN
86 st->codec->extradata = av_realloc (st->codec->extradata, cds);
87 cdp = st->codec->extradata + st->codec->extradata_size;
1ed923ea
MR
88 *cdp++ = os->psize >> 8;
89 *cdp++ = os->psize & 0xff;
90 memcpy (cdp, os->buf + os->pstart, os->psize);
01f4895c 91 st->codec->extradata_size = cds;
1ed923ea 92
5b558574 93 return 1;
1ed923ea
MR
94}
95
96static uint64_t
97theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp)
98{
99 AVStream *st = ctx->streams[idx];
100 ogg_t *ogg = ctx->priv_data;
101 ogg_stream_t *os = ogg->streams + idx;
102 theora_params_t *thp = os->private;
103 uint64_t iframe = gp >> thp->gpshift;
104 uint64_t pframe = gp & thp->gpmask;
105
01f4895c
MN
106 return (iframe + pframe) * AV_TIME_BASE * st->codec->time_base.num /
107 st->codec->time_base.den;
1ed923ea
MR
108}
109
110ogg_codec_t theora_codec = {
111 .magic = "\200theora",
112 .magicsize = 7,
113 .header = theora_header,
114 .gptopts = theora_gptopts
115};