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;
48 if(!(os->buf[os->pstart] & 0x80))
52 thp = av_mallocz(sizeof(*thp));
56 if (os->buf[os->pstart] == 0x80) {
61 init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
63 skip_bits_long(&gb, 7*8); /* 0x80"theora" */
65 thp->version = get_bits_long(&gb, 24);
66 if (thp->version < 0x030100)
68 av_log(s, AV_LOG_ERROR,
69 "Too old or unsupported Theora (%x)\n", thp->version);
73 width = get_bits(&gb, 16) << 4;
74 height = get_bits(&gb, 16) << 4;
75 avcodec_set_dimensions(st->codec, width, height);
77 if (thp->version >= 0x030400)
80 if (thp->version >= 0x030200) {
81 width = get_bits_long(&gb, 24);
82 height = get_bits_long(&gb, 24);
83 if ( width <= st->codec->width && width > st->codec->width-16
84 && height <= st->codec->height && height > st->codec->height-16)
85 avcodec_set_dimensions(st->codec, width, height);
89 timebase.den = get_bits_long(&gb, 32);
90 timebase.num = get_bits_long(&gb, 32);
91 if (!(timebase.num > 0 && timebase.den > 0)) {
92 av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n");
96 avpriv_set_pts_info(st, 64, timebase.num, timebase.den);
98 st->sample_aspect_ratio.num = get_bits_long(&gb, 24);
99 st->sample_aspect_ratio.den = get_bits_long(&gb, 24);
101 if (thp->version >= 0x030200)
102 skip_bits_long(&gb, 38);
103 if (thp->version >= 0x304000)
106 thp->gpshift = get_bits(&gb, 5);
107 thp->gpmask = (1 << thp->gpshift) - 1;
109 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
110 st->codec->codec_id = CODEC_ID_THEORA;
111 st->need_parsing = AVSTREAM_PARSE_HEADERS;
113 } else if (os->buf[os->pstart] == 0x83) {
114 ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8);
117 st->codec->extradata = av_realloc (st->codec->extradata,
118 cds + FF_INPUT_BUFFER_PADDING_SIZE);
119 cdp = st->codec->extradata + st->codec->extradata_size;
120 *cdp++ = os->psize >> 8;
121 *cdp++ = os->psize & 0xff;
122 memcpy (cdp, os->buf + os->pstart, os->psize);
123 st->codec->extradata_size = cds;
129 theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, int64_t *dts)
131 struct ogg *ogg = ctx->priv_data;
132 struct ogg_stream *os = ogg->streams + idx;
133 struct theora_params *thp = os->private;
134 uint64_t iframe, pframe;
137 return AV_NOPTS_VALUE;
139 iframe = gp >> thp->gpshift;
140 pframe = gp & thp->gpmask;
142 if (thp->version < 0x030201)
146 os->pflags |= AV_PKT_FLAG_KEY;
149 *dts = iframe + pframe;
151 return iframe + pframe;
154 static int theora_packet(AVFormatContext *s, int idx)
156 struct ogg *ogg = s->priv_data;
157 struct ogg_stream *os = ogg->streams + idx;
160 /* first packet handling
161 here we parse the duration of each packet in the first page and compare
162 the total duration to the page granule to find the encoder delay and
163 set the first timestamp */
165 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
169 for (seg = os->segp; seg < os->nsegs; seg++) {
170 if (os->segments[seg] < 255)
174 os->lastpts = os->lastdts = theora_gptopts(s, idx, os->granule, NULL) - duration;
175 if(s->streams[idx]->start_time == AV_NOPTS_VALUE) {
176 s->streams[idx]->start_time = os->lastpts;
177 if (s->streams[idx]->duration)
178 s->streams[idx]->duration -= s->streams[idx]->start_time;
182 /* parse packet duration */
190 const struct ogg_codec ff_theora_codec = {
191 .magic = "\200theora",
193 .header = theora_header,
194 .packet = theora_packet,
195 .gptopts = theora_gptopts