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/get_bits.h"
32 struct theora_params {
39 theora_header (AVFormatContext * s, int idx)
41 struct ogg *ogg = s->priv_data;
42 struct ogg_stream *os = ogg->streams + idx;
43 AVStream *st = s->streams[idx];
44 struct theora_params *thp = os->private;
45 int cds = st->codec->extradata_size + os->psize + 2, err;
48 if(!(os->buf[os->pstart] & 0x80))
52 thp = av_mallocz(sizeof(*thp));
56 switch (os->buf[os->pstart]) {
62 init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
64 skip_bits_long(&gb, 7*8); /* 0x80"theora" */
66 thp->version = get_bits_long(&gb, 24);
67 if (thp->version < 0x030100)
69 av_log(s, AV_LOG_ERROR,
70 "Too old or unsupported Theora (%x)\n", thp->version);
74 width = get_bits(&gb, 16) << 4;
75 height = get_bits(&gb, 16) << 4;
76 avcodec_set_dimensions(st->codec, width, height);
78 if (thp->version >= 0x030400)
81 if (thp->version >= 0x030200) {
82 width = get_bits_long(&gb, 24);
83 height = get_bits_long(&gb, 24);
84 if ( width <= st->codec->width && width > st->codec->width-16
85 && height <= st->codec->height && height > st->codec->height-16)
86 avcodec_set_dimensions(st->codec, width, height);
90 timebase.den = get_bits_long(&gb, 32);
91 timebase.num = get_bits_long(&gb, 32);
92 if (!(timebase.num > 0 && timebase.den > 0)) {
93 av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n");
97 avpriv_set_pts_info(st, 64, timebase.num, timebase.den);
99 st->sample_aspect_ratio.num = get_bits_long(&gb, 24);
100 st->sample_aspect_ratio.den = get_bits_long(&gb, 24);
102 if (thp->version >= 0x030200)
103 skip_bits_long(&gb, 38);
104 if (thp->version >= 0x304000)
107 thp->gpshift = get_bits(&gb, 5);
108 thp->gpmask = (1 << thp->gpshift) - 1;
110 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
111 st->codec->codec_id = AV_CODEC_ID_THEORA;
112 st->need_parsing = AVSTREAM_PARSE_HEADERS;
117 ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 7);
126 if ((err = av_reallocp(&st->codec->extradata,
127 cds + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
129 cdp = st->codec->extradata + st->codec->extradata_size;
130 *cdp++ = os->psize >> 8;
131 *cdp++ = os->psize & 0xff;
132 memcpy (cdp, os->buf + os->pstart, os->psize);
133 st->codec->extradata_size = cds;
139 theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, int64_t *dts)
141 struct ogg *ogg = ctx->priv_data;
142 struct ogg_stream *os = ogg->streams + idx;
143 struct theora_params *thp = os->private;
144 uint64_t iframe, pframe;
147 return AV_NOPTS_VALUE;
149 iframe = gp >> thp->gpshift;
150 pframe = gp & thp->gpmask;
152 if (thp->version < 0x030201)
156 os->pflags |= AV_PKT_FLAG_KEY;
159 *dts = iframe + pframe;
161 return iframe + pframe;
164 const struct ogg_codec ff_theora_codec = {
165 .magic = "\200theora",
167 .header = theora_header,
168 .gptopts = theora_gptopts,