blob: b14f9f0669c1addc191b42b42411bdef7fd3dd05
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->codecpar->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->codecpar->width = get_bits(&gb, 16) << 4; |
76 | st->codecpar->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->codecpar->width && width > st->codecpar->width - 16 && |
85 | height <= st->codecpar->height && height > st->codecpar->height - 16) { |
86 | st->codecpar->width = width; |
87 | st->codecpar->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 = (1U << thp->gpshift) - 1; |
112 | |
113 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
114 | st->codecpar->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->codecpar->extradata, |
130 | cds + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) { |
131 | st->codecpar->extradata_size = 0; |
132 | return err; |
133 | } |
134 | memset(st->codecpar->extradata + cds, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
135 | |
136 | cdp = st->codecpar->extradata + st->codecpar->extradata_size; |
137 | *cdp++ = os->psize >> 8; |
138 | *cdp++ = os->psize & 0xff; |
139 | memcpy(cdp, os->buf + os->pstart, os->psize); |
140 | st->codecpar->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 > 0) |
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 | }; |
215 |