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 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;
116 ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8);
122 av_log(s, AV_LOG_ERROR, "Unknown header type %X\n", os->buf[os->pstart]);
126 st->codec->extradata = av_realloc (st->codec->extradata,
127 cds + FF_INPUT_BUFFER_PADDING_SIZE);
128 cdp = st->codec->extradata + st->codec->extradata_size;
129 *cdp++ = os->psize >> 8;
130 *cdp++ = os->psize & 0xff;
131 memcpy (cdp, os->buf + os->pstart, os->psize);
132 st->codec->extradata_size = cds;
138 theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, int64_t *dts)
140 struct ogg *ogg = ctx->priv_data;
141 struct ogg_stream *os = ogg->streams + idx;
142 struct theora_params *thp = os->private;
143 uint64_t iframe, pframe;
146 return AV_NOPTS_VALUE;
148 iframe = gp >> thp->gpshift;
149 pframe = gp & thp->gpmask;
151 if (thp->version < 0x030201)
155 os->pflags |= AV_PKT_FLAG_KEY;
158 *dts = iframe + pframe;
160 return iframe + pframe;
163 static int theora_packet(AVFormatContext *s, int idx)
165 struct ogg *ogg = s->priv_data;
166 struct ogg_stream *os = ogg->streams + idx;
169 /* first packet handling
170 here we parse the duration of each packet in the first page and compare
171 the total duration to the page granule to find the encoder delay and
172 set the first timestamp */
174 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
178 for (seg = os->segp; seg < os->nsegs; seg++) {
179 if (os->segments[seg] < 255)
183 os->lastpts = os->lastdts = theora_gptopts(s, idx, os->granule, NULL) - duration;
184 if(s->streams[idx]->start_time == AV_NOPTS_VALUE) {
185 s->streams[idx]->start_time = os->lastpts;
186 if (s->streams[idx]->duration)
187 s->streams[idx]->duration -= s->streams[idx]->start_time;
191 /* parse packet duration */
199 const struct ogg_codec ff_theora_codec = {
200 .magic = "\200theora",
202 .header = theora_header,
203 .packet = theora_packet,
204 .gptopts = theora_gptopts,