changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / oggparsetheora.c
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
31 typedef struct theora_params {
32 int gpshift;
33 int gpmask;
34 } theora_params_t;
35
36 static int
37 theora_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;
43 int cds = st->codec->extradata_size + os->psize + 2;
44 uint8_t *cdp;
45
46 if(!(os->buf[os->pstart] & 0x80))
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" */
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
65 st->codec->width = get_bits(&gb, 16) << 4;
66 st->codec->height = get_bits(&gb, 16) << 4;
67
68 skip_bits(&gb, 64);
69 st->codec->time_base.den = get_bits(&gb, 32);
70 st->codec->time_base.num = get_bits(&gb, 32);
71
72 st->codec->sample_aspect_ratio.num = get_bits(&gb, 24);
73 st->codec->sample_aspect_ratio.den = get_bits(&gb, 24);
74
75 skip_bits(&gb, 38);
76 thp->gpshift = get_bits(&gb, 5);
77 thp->gpmask = (1 << thp->gpshift) - 1;
78
79 st->codec->codec_type = CODEC_TYPE_VIDEO;
80 st->codec->codec_id = CODEC_ID_THEORA;
81
82 } else if (os->buf[os->pstart] == 0x83) {
83 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
84 }
85
86 st->codec->extradata = av_realloc (st->codec->extradata, cds);
87 cdp = st->codec->extradata + st->codec->extradata_size;
88 *cdp++ = os->psize >> 8;
89 *cdp++ = os->psize & 0xff;
90 memcpy (cdp, os->buf + os->pstart, os->psize);
91 st->codec->extradata_size = cds;
92
93 return 1;
94 }
95
96 static uint64_t
97 theora_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
106 return (iframe + pframe) * AV_TIME_BASE * st->codec->time_base.num /
107 st->codec->time_base.den;
108 }
109
110 ogg_codec_t theora_codec = {
111 .magic = "\200theora",
112 .magicsize = 7,
113 .header = theora_header,
114 .gptopts = theora_gptopts
115 };