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1 | /* |
2 | * On2 VP8 parser for Ogg | |
3 | * Copyright (C) 2013 James Almer | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "libavutil/intreadwrite.h" | |
23 | #include "avformat.h" | |
24 | #include "internal.h" | |
25 | #include "oggdec.h" | |
26 | ||
27 | #define VP8_HEADER_SIZE 26 | |
28 | ||
29 | static int vp8_header(AVFormatContext *s, int idx) | |
30 | { | |
31 | struct ogg *ogg = s->priv_data; | |
32 | struct ogg_stream *os = ogg->streams + idx; | |
33 | uint8_t *p = os->buf + os->pstart; | |
34 | AVStream *st = s->streams[idx]; | |
35 | AVRational framerate; | |
36 | ||
37 | if (os->psize < 7 || p[0] != 0x4f) | |
38 | return 0; | |
39 | ||
40 | switch (p[5]){ | |
41 | case 0x01: | |
42 | if (os->psize < VP8_HEADER_SIZE) { | |
43 | av_log(s, AV_LOG_ERROR, "Invalid OggVP8 header packet"); | |
44 | return AVERROR_INVALIDDATA; | |
45 | } | |
46 | ||
47 | if (p[6] != 1) { | |
48 | av_log(s, AV_LOG_WARNING, "Unknown OggVP8 version %d.%d\n", p[6], p[7]); | |
49 | return AVERROR_INVALIDDATA; | |
50 | } | |
51 | ||
52 | st->codec->width = AV_RB16(p + 8); | |
53 | st->codec->height = AV_RB16(p + 10); | |
54 | st->sample_aspect_ratio.num = AV_RB24(p + 12); | |
55 | st->sample_aspect_ratio.den = AV_RB24(p + 15); | |
56 | framerate.den = AV_RB32(p + 18); | |
57 | framerate.num = AV_RB32(p + 22); | |
58 | ||
59 | avpriv_set_pts_info(st, 64, framerate.num, framerate.den); | |
60 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
61 | st->codec->codec_id = AV_CODEC_ID_VP8; | |
62 | st->need_parsing = AVSTREAM_PARSE_HEADERS; | |
63 | break; | |
64 | case 0x02: | |
65 | if (p[6] != 0x20) | |
66 | return AVERROR_INVALIDDATA; | |
67 | ff_vorbis_stream_comment(s, st, p + 7, os->psize - 7); | |
68 | break; | |
69 | default: | |
70 | av_log(s, AV_LOG_ERROR, "Unknown VP8 header type 0x%02X\n", p[5]); | |
71 | return AVERROR_INVALIDDATA; | |
72 | } | |
73 | ||
74 | return 1; | |
75 | } | |
76 | ||
77 | static uint64_t vp8_gptopts(AVFormatContext *s, int idx, uint64_t granule, int64_t *dts) | |
78 | { | |
79 | struct ogg *ogg = s->priv_data; | |
80 | struct ogg_stream *os = ogg->streams + idx; | |
81 | ||
82 | uint64_t pts = (granule >> 32); | |
83 | uint32_t dist = (granule >> 3) & 0x07ffffff; | |
84 | ||
85 | if (!dist) | |
86 | os->pflags |= AV_PKT_FLAG_KEY; | |
87 | ||
88 | if (dts) | |
89 | *dts = pts; | |
90 | ||
91 | return pts; | |
92 | } | |
93 | ||
94 | static int vp8_packet(AVFormatContext *s, int idx) | |
95 | { | |
96 | struct ogg *ogg = s->priv_data; | |
97 | struct ogg_stream *os = ogg->streams + idx; | |
98 | uint8_t *p = os->buf + os->pstart; | |
99 | ||
100 | if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) { | |
101 | int seg; | |
102 | int duration; | |
103 | uint8_t *last_pkt = p; | |
104 | uint8_t *next_pkt; | |
105 | ||
106 | seg = os->segp; | |
107 | duration = (last_pkt[0] >> 4) & 1; | |
108 | next_pkt = last_pkt += os->psize; | |
109 | for (; seg < os->nsegs; seg++) { | |
110 | if (os->segments[seg] < 255) { | |
111 | duration += (last_pkt[0] >> 4) & 1; | |
112 | last_pkt = next_pkt + os->segments[seg]; | |
113 | } | |
114 | next_pkt += os->segments[seg]; | |
115 | } | |
116 | os->lastpts = os->lastdts = vp8_gptopts(s, idx, os->granule, NULL) - duration; | |
117 | if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { | |
118 | s->streams[idx]->start_time = os->lastpts; | |
119 | if (s->streams[idx]->duration) | |
120 | s->streams[idx]->duration -= s->streams[idx]->start_time; | |
121 | } | |
122 | } | |
123 | ||
124 | if (os->psize > 0) | |
125 | os->pduration = (p[0] >> 4) & 1; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | const struct ogg_codec ff_vp8_codec = { | |
131 | .magic = "OVP80", | |
132 | .magicsize = 5, | |
133 | .header = vp8_header, | |
134 | .packet = vp8_packet, | |
135 | .gptopts = vp8_gptopts, | |
136 | .nb_header = 1, | |
137 | }; |