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1 | /** |
2 | * Copyright (C) 2005 Matthieu CASTET, Alex Beregszaszi | |
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 "libavutil/bswap.h" | |
27 | #include "libavcodec/get_bits.h" | |
28 | #include "avformat.h" | |
29 | #include "internal.h" | |
30 | #include "oggdec.h" | |
31 | ||
32 | typedef struct TheoraParams { | |
33 | int gpshift; | |
34 | int gpmask; | |
35 | unsigned version; | |
36 | } TheoraParams; | |
37 | ||
38 | static int theora_header(AVFormatContext *s, int idx) | |
39 | { | |
40 | struct ogg *ogg = s->priv_data; | |
41 | struct ogg_stream *os = ogg->streams + idx; | |
42 | AVStream *st = s->streams[idx]; | |
43 | TheoraParams *thp = os->private; | |
44 | int cds = st->codec->extradata_size + os->psize + 2; | |
45 | int err; | |
46 | uint8_t *cdp; | |
47 | ||
48 | if (!(os->buf[os->pstart] & 0x80)) | |
49 | return 0; | |
50 | ||
51 | if (!thp) { | |
52 | thp = av_mallocz(sizeof(*thp)); | |
53 | if (!thp) | |
54 | return AVERROR(ENOMEM); | |
55 | os->private = thp; | |
56 | } | |
57 | ||
58 | switch (os->buf[os->pstart]) { | |
59 | case 0x80: { | |
60 | GetBitContext gb; | |
61 | AVRational timebase; | |
62 | ||
63 | init_get_bits(&gb, os->buf + os->pstart, os->psize * 8); | |
64 | ||
65 | /* 0x80"theora" */ | |
66 | skip_bits_long(&gb, 7 * 8); | |
67 | ||
68 | thp->version = get_bits_long(&gb, 24); | |
69 | if (thp->version < 0x030100) { | |
70 | av_log(s, AV_LOG_ERROR, | |
71 | "Too old or unsupported Theora (%x)\n", thp->version); | |
72 | return AVERROR(ENOSYS); | |
73 | } | |
74 | ||
75 | st->codec->width = get_bits(&gb, 16) << 4; | |
76 | st->codec->height = get_bits(&gb, 16) << 4; | |
77 | ||
78 | if (thp->version >= 0x030400) | |
79 | skip_bits(&gb, 100); | |
80 | ||
81 | if (thp->version >= 0x030200) { | |
82 | int width = get_bits_long(&gb, 24); | |
83 | int 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 | st->codec->width = width; | |
87 | st->codec->height = height; | |
88 | } | |
89 | ||
90 | skip_bits(&gb, 16); | |
91 | } | |
92 | ||
93 | timebase.den = get_bits_long(&gb, 32); | |
94 | timebase.num = get_bits_long(&gb, 32); | |
95 | if (!(timebase.num > 0 && timebase.den > 0)) { | |
96 | av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n"); | |
97 | timebase.num = 1; | |
98 | timebase.den = 25; | |
99 | } | |
100 | avpriv_set_pts_info(st, 64, timebase.num, timebase.den); | |
101 | ||
102 | st->sample_aspect_ratio.num = get_bits_long(&gb, 24); | |
103 | st->sample_aspect_ratio.den = get_bits_long(&gb, 24); | |
104 | ||
105 | if (thp->version >= 0x030200) | |
106 | skip_bits_long(&gb, 38); | |
107 | if (thp->version >= 0x304000) | |
108 | skip_bits(&gb, 2); | |
109 | ||
110 | thp->gpshift = get_bits(&gb, 5); | |
111 | thp->gpmask = (1 << thp->gpshift) - 1; | |
112 | ||
113 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
114 | st->codec->codec_id = AV_CODEC_ID_THEORA; | |
115 | st->need_parsing = AVSTREAM_PARSE_HEADERS; | |
116 | } | |
117 | break; | |
118 | case 0x81: | |
119 | ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7, os->psize - 7); | |
120 | case 0x82: | |
121 | if (!thp->version) | |
122 | return AVERROR_INVALIDDATA; | |
123 | break; | |
124 | default: | |
125 | av_log(s, AV_LOG_ERROR, "Unknown header type %X\n", os->buf[os->pstart]); | |
126 | return AVERROR_INVALIDDATA; | |
127 | } | |
128 | ||
129 | if ((err = av_reallocp(&st->codec->extradata, | |
130 | cds + FF_INPUT_BUFFER_PADDING_SIZE)) < 0) { | |
131 | st->codec->extradata_size = 0; | |
132 | return err; | |
133 | } | |
134 | memset(st->codec->extradata + cds, 0, FF_INPUT_BUFFER_PADDING_SIZE); | |
135 | ||
136 | cdp = st->codec->extradata + st->codec->extradata_size; | |
137 | *cdp++ = os->psize >> 8; | |
138 | *cdp++ = os->psize & 0xff; | |
139 | memcpy(cdp, os->buf + os->pstart, os->psize); | |
140 | st->codec->extradata_size = cds; | |
141 | ||
142 | return 1; | |
143 | } | |
144 | ||
145 | static uint64_t theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, | |
146 | int64_t *dts) | |
147 | { | |
148 | struct ogg *ogg = ctx->priv_data; | |
149 | struct ogg_stream *os = ogg->streams + idx; | |
150 | TheoraParams *thp = os->private; | |
151 | uint64_t iframe, pframe; | |
152 | ||
153 | if (!thp) | |
154 | return AV_NOPTS_VALUE; | |
155 | ||
156 | iframe = gp >> thp->gpshift; | |
157 | pframe = gp & thp->gpmask; | |
158 | ||
159 | if (thp->version < 0x030201) | |
160 | iframe++; | |
161 | ||
162 | if (!pframe) | |
163 | os->pflags |= AV_PKT_FLAG_KEY; | |
164 | ||
165 | if (dts) | |
166 | *dts = iframe + pframe; | |
167 | ||
168 | return iframe + pframe; | |
169 | } | |
170 | ||
171 | static int theora_packet(AVFormatContext *s, int idx) | |
172 | { | |
173 | struct ogg *ogg = s->priv_data; | |
174 | struct ogg_stream *os = ogg->streams + idx; | |
175 | int duration; | |
176 | ||
177 | /* first packet handling | |
178 | here we parse the duration of each packet in the first page and compare | |
179 | the total duration to the page granule to find the encoder delay and | |
180 | set the first timestamp */ | |
181 | ||
182 | if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) { | |
183 | int seg; | |
184 | ||
185 | duration = 1; | |
186 | for (seg = os->segp; seg < os->nsegs; seg++) { | |
187 | if (os->segments[seg] < 255) | |
188 | duration ++; | |
189 | } | |
190 | ||
191 | os->lastpts = os->lastdts = theora_gptopts(s, idx, os->granule, NULL) - duration; | |
192 | if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { | |
193 | s->streams[idx]->start_time = os->lastpts; | |
194 | if (s->streams[idx]->duration) | |
195 | s->streams[idx]->duration -= s->streams[idx]->start_time; | |
196 | } | |
197 | } | |
198 | ||
199 | /* parse packet duration */ | |
200 | if (os->psize > 0) { | |
201 | os->pduration = 1; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | const struct ogg_codec ff_theora_codec = { | |
208 | .magic = "\200theora", | |
209 | .magicsize = 7, | |
210 | .header = theora_header, | |
211 | .packet = theora_packet, | |
212 | .gptopts = theora_gptopts, | |
213 | .nb_header = 3, | |
214 | }; |