2 Copyright (C) 2005 Matthieu CASTET, Alex Beregszaszi
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:
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
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.
26 #include "libavutil/bswap.h"
27 #include "libavcodec/bitstream.h"
31 typedef struct theora_params {
37 theora_header (AVFormatContext * s, int idx)
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;
46 if(!(os->buf[os->pstart] & 0x80))
50 thp = av_mallocz(sizeof(*thp));
54 if (os->buf[os->pstart] == 0x80) {
59 init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
61 skip_bits(&gb, 7*8); /* 0x80"theora" */
63 version = get_bits_long(&gb, 24);
64 if (version < 0x030100)
66 av_log(s, AV_LOG_ERROR,
67 "Too old or unsupported Theora (%x)\n", version);
71 width = get_bits(&gb, 16) << 4;
72 height = get_bits(&gb, 16) << 4;
73 avcodec_set_dimensions(st->codec, width, height);
75 if (version >= 0x030400)
78 if (version >= 0x030200) {
79 width = get_bits_long(&gb, 24);
80 height = get_bits_long(&gb, 24);
81 if ( width <= st->codec->width && width > st->codec->width-16
82 && height <= st->codec->height && height > st->codec->height-16)
83 avcodec_set_dimensions(st->codec, width, height);
87 st->codec->time_base.den = get_bits_long(&gb, 32);
88 st->codec->time_base.num = get_bits_long(&gb, 32);
89 st->time_base = st->codec->time_base;
91 st->sample_aspect_ratio.num = get_bits_long(&gb, 24);
92 st->sample_aspect_ratio.den = get_bits_long(&gb, 24);
94 if (version >= 0x030200)
96 if (version >= 0x304000)
99 thp->gpshift = get_bits(&gb, 5);
100 thp->gpmask = (1 << thp->gpshift) - 1;
102 st->codec->codec_type = CODEC_TYPE_VIDEO;
103 st->codec->codec_id = CODEC_ID_THEORA;
105 } else if (os->buf[os->pstart] == 0x83) {
106 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
109 st->codec->extradata = av_realloc (st->codec->extradata, cds);
110 cdp = st->codec->extradata + st->codec->extradata_size;
111 *cdp++ = os->psize >> 8;
112 *cdp++ = os->psize & 0xff;
113 memcpy (cdp, os->buf + os->pstart, os->psize);
114 st->codec->extradata_size = cds;
120 theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp)
122 ogg_t *ogg = ctx->priv_data;
123 ogg_stream_t *os = ogg->streams + idx;
124 theora_params_t *thp = os->private;
125 uint64_t iframe = gp >> thp->gpshift;
126 uint64_t pframe = gp & thp->gpmask;
129 os->pflags |= PKT_FLAG_KEY;
131 return iframe + pframe;
134 const ogg_codec_t ff_theora_codec = {
135 .magic = "\200theora",
137 .header = theora_header,
138 .gptopts = theora_gptopts