FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/oggparsevp8.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 62 71 87.3%
Branches: 27 35 77.1%

Line Branch Exec Source
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
24 #include "avformat.h"
25 #include "internal.h"
26 #include "oggdec.h"
27
28 #define VP8_HEADER_SIZE 26
29
30 5 static int vp8_header(AVFormatContext *s, int idx)
31 {
32 5 struct ogg *ogg = s->priv_data;
33 5 struct ogg_stream *os = ogg->streams + idx;
34 5 uint8_t *p = os->buf + os->pstart;
35 5 AVStream *st = s->streams[idx];
36 AVRational framerate;
37
38
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5 if (os->psize < 7 || p[0] != 0x4f)
39 2 return 0;
40
41
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3 switch (p[5]){
42 2 case 0x01:
43
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2 if (os->psize < VP8_HEADER_SIZE) {
44 av_log(s, AV_LOG_ERROR, "Invalid OggVP8 header packet");
45 return AVERROR_INVALIDDATA;
46 }
47
48
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2 if (p[6] != 1) {
49 av_log(s, AV_LOG_WARNING,
50 "Unknown OggVP8 version %d.%d\n", p[6], p[7]);
51 return AVERROR_INVALIDDATA;
52 }
53
54 2 st->codecpar->width = AV_RB16(p + 8);
55 2 st->codecpar->height = AV_RB16(p + 10);
56 2 st->sample_aspect_ratio.num = AV_RB24(p + 12);
57 2 st->sample_aspect_ratio.den = AV_RB24(p + 15);
58 2 framerate.num = AV_RB32(p + 18);
59 2 framerate.den = AV_RB32(p + 22);
60
61 2 avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
62 2 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
63 2 st->codecpar->codec_id = AV_CODEC_ID_VP8;
64 2 ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
65 2 break;
66 1 case 0x02:
67
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1 if (p[6] != 0x20)
68 return AVERROR_INVALIDDATA;
69 1 ff_vorbis_stream_comment(s, st, p + 7, os->psize - 7);
70 1 break;
71 default:
72 av_log(s, AV_LOG_ERROR, "Unknown VP8 header type 0x%02X\n", p[5]);
73 return AVERROR_INVALIDDATA;
74 }
75
76 3 return 1;
77 }
78
79 218 static uint64_t vp8_gptopts(AVFormatContext *s, int idx,
80 uint64_t granule, int64_t *dts)
81 {
82 218 struct ogg *ogg = s->priv_data;
83 218 struct ogg_stream *os = ogg->streams + idx;
84
85 218 int invcnt = !((granule >> 30) & 3);
86 // If page granule is that of an invisible vp8 frame, its pts will be
87 // that of the end of the next visible frame. We subtract 1 for those
88 // to prevent messing up pts calculations.
89 218 uint64_t pts = (granule >> 32) - invcnt;
90 218 uint32_t dist = (granule >> 3) & 0x07ffffff;
91
92
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218 if (!dist)
93 4 os->pflags |= AV_PKT_FLAG_KEY;
94
95
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218 if (dts)
96 22 *dts = pts;
97
98 218 return pts;
99 }
100
101 207 static int vp8_packet(AVFormatContext *s, int idx)
102 {
103 207 struct ogg *ogg = s->priv_data;
104 207 struct ogg_stream *os = ogg->streams + idx;
105 207 uint8_t *p = os->buf + os->pstart;
106
107
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207 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) &&
108
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190 !(os->flags & OGG_FLAG_EOS)) {
109 int seg;
110 int duration;
111 181 uint8_t *last_pkt = p;
112 uint8_t *next_pkt;
113
114 181 seg = os->segp;
115 181 duration = (last_pkt[0] >> 4) & 1;
116 181 next_pkt = last_pkt += os->psize;
117
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2868 for (; seg < os->nsegs; seg++) {
118
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2687 if (os->segments[seg] < 255) {
119 1506 duration += (last_pkt[0] >> 4) & 1;
120 1506 last_pkt = next_pkt + os->segments[seg];
121 }
122 2687 next_pkt += os->segments[seg];
123 }
124 181 os->lastpts =
125 181 os->lastdts = vp8_gptopts(s, idx, os->granule, NULL) - duration;
126
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181 if(s->streams[idx]->start_time == AV_NOPTS_VALUE) {
127 2 s->streams[idx]->start_time = os->lastpts;
128
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2 if (s->streams[idx]->duration && s->streams[idx]->duration != AV_NOPTS_VALUE)
129 2 s->streams[idx]->duration -= s->streams[idx]->start_time;
130 }
131 }
132
133
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207 if (os->psize > 0)
134 207 os->pduration = (p[0] >> 4) & 1;
135
136 207 return 0;
137 }
138
139 const struct ogg_codec ff_vp8_codec = {
140 .magic = "OVP80",
141 .magicsize = 5,
142 .header = vp8_header,
143 .packet = vp8_packet,
144 .gptopts = vp8_gptopts,
145 .nb_header = 1,
146 };
147