/src/ffmpeg/libavformat/lvfdec.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * LVF demuxer |
3 | | * Copyright (c) 2012 Paul B Mahol |
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 "demux.h" |
25 | | #include "riff.h" |
26 | | |
27 | | static int lvf_probe(const AVProbeData *p) |
28 | 358k | { |
29 | 358k | if (AV_RL32(p->buf) != MKTAG('L', 'V', 'F', 'F')) |
30 | 358k | return 0; |
31 | | |
32 | 146 | if (!AV_RL32(p->buf + 16) || AV_RL32(p->buf + 16) > 256) |
33 | 90 | return AVPROBE_SCORE_MAX / 8; |
34 | | |
35 | 56 | return AVPROBE_SCORE_EXTENSION; |
36 | 146 | } |
37 | | |
38 | | static int lvf_read_header(AVFormatContext *s) |
39 | 7.23k | { |
40 | 7.23k | AVStream *st; |
41 | 7.23k | int64_t next_offset; |
42 | 7.23k | unsigned size, nb_streams, id; |
43 | | |
44 | 7.23k | avio_skip(s->pb, 16); |
45 | 7.23k | nb_streams = avio_rl32(s->pb); |
46 | 7.23k | if (!nb_streams) |
47 | 4.16k | return AVERROR_INVALIDDATA; |
48 | 3.06k | if (nb_streams > 2) { |
49 | 422 | avpriv_request_sample(s, "%d streams", nb_streams); |
50 | 422 | return AVERROR_PATCHWELCOME; |
51 | 422 | } |
52 | | |
53 | 2.64k | avio_skip(s->pb, 1012); |
54 | | |
55 | 30.8k | while (!avio_feof(s->pb)) { |
56 | 30.6k | id = avio_rl32(s->pb); |
57 | 30.6k | size = avio_rl32(s->pb); |
58 | 30.6k | next_offset = avio_tell(s->pb) + size; |
59 | | |
60 | 30.6k | switch (id) { |
61 | 14.2k | case MKTAG('0', '0', 'f', 'm'): |
62 | 14.2k | st = avformat_new_stream(s, 0); |
63 | 14.2k | if (!st) |
64 | 1 | return AVERROR(ENOMEM); |
65 | | |
66 | 14.2k | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
67 | 14.2k | avio_skip(s->pb, 4); |
68 | 14.2k | st->codecpar->width = avio_rl32(s->pb); |
69 | 14.2k | st->codecpar->height = avio_rl32(s->pb); |
70 | 14.2k | avio_skip(s->pb, 4); |
71 | 14.2k | st->codecpar->codec_tag = avio_rl32(s->pb); |
72 | 14.2k | st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
73 | 14.2k | st->codecpar->codec_tag); |
74 | 14.2k | avpriv_set_pts_info(st, 32, 1, 1000); |
75 | 14.2k | break; |
76 | 13.9k | case MKTAG('0', '1', 'f', 'm'): |
77 | 13.9k | st = avformat_new_stream(s, 0); |
78 | 13.9k | if (!st) |
79 | 1 | return AVERROR(ENOMEM); |
80 | | |
81 | 13.9k | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
82 | 13.9k | st->codecpar->codec_tag = avio_rl16(s->pb); |
83 | 13.9k | st->codecpar->ch_layout.nb_channels = avio_rl16(s->pb); |
84 | 13.9k | st->codecpar->sample_rate = avio_rl16(s->pb); |
85 | 13.9k | avio_skip(s->pb, 8); |
86 | 13.9k | st->codecpar->bits_per_coded_sample = avio_r8(s->pb); |
87 | 13.9k | st->codecpar->codec_id = ff_codec_get_id(ff_codec_wav_tags, |
88 | 13.9k | st->codecpar->codec_tag); |
89 | 13.9k | avpriv_set_pts_info(st, 32, 1, 1000); |
90 | 13.9k | break; |
91 | 2.40k | case 0: |
92 | 2.40k | avio_seek(s->pb, 2048 + 8, SEEK_SET); |
93 | 2.40k | return 0; |
94 | 91 | default: |
95 | 91 | avpriv_request_sample(s, "id %d", id); |
96 | 91 | return AVERROR_PATCHWELCOME; |
97 | 30.6k | } |
98 | | |
99 | 28.1k | avio_seek(s->pb, next_offset, SEEK_SET); |
100 | 28.1k | } |
101 | | |
102 | 149 | return AVERROR_EOF; |
103 | 2.64k | } |
104 | | |
105 | | static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt) |
106 | 42.3k | { |
107 | 42.3k | unsigned size, flags, timestamp, id; |
108 | 42.3k | int64_t pos; |
109 | 42.3k | int ret, is_video = 0; |
110 | 42.3k | int stream_index; |
111 | | |
112 | 42.3k | pos = avio_tell(s->pb); |
113 | 91.3k | while (!avio_feof(s->pb)) { |
114 | 87.9k | id = avio_rl32(s->pb); |
115 | 87.9k | size = avio_rl32(s->pb); |
116 | | |
117 | 87.9k | if (size == 0xFFFFFFFFu) |
118 | 111 | return AVERROR_EOF; |
119 | | |
120 | 87.8k | switch (id) { |
121 | 38.0k | case MKTAG('0', '0', 'd', 'c'): |
122 | 38.0k | is_video = 1; |
123 | 38.2k | case MKTAG('0', '1', 'w', 'b'): |
124 | 38.2k | if (size < 8) |
125 | 10 | return AVERROR_INVALIDDATA; |
126 | 38.2k | stream_index = is_video ? 0 : 1; |
127 | 38.2k | if (stream_index >= s->nb_streams) |
128 | 4 | return AVERROR_INVALIDDATA; |
129 | 38.2k | timestamp = avio_rl32(s->pb); |
130 | 38.2k | flags = avio_rl32(s->pb); |
131 | 38.2k | ret = av_get_packet(s->pb, pkt, size - 8); |
132 | 38.2k | if (flags & (1 << 12)) |
133 | 21.7k | pkt->flags |= AV_PKT_FLAG_KEY; |
134 | 38.2k | pkt->stream_index = stream_index; |
135 | 38.2k | pkt->pts = timestamp; |
136 | 38.2k | pkt->pos = pos; |
137 | 38.2k | return ret; |
138 | 49.5k | default: |
139 | 49.5k | ret = avio_skip(s->pb, size); |
140 | 87.8k | } |
141 | | |
142 | 49.5k | if (ret < 0) |
143 | 653 | return ret; |
144 | 49.5k | } |
145 | | |
146 | 3.38k | return AVERROR_EOF; |
147 | 42.3k | } |
148 | | |
149 | | const FFInputFormat ff_lvf_demuxer = { |
150 | | .p.name = "lvf", |
151 | | .p.long_name = NULL_IF_CONFIG_SMALL("LVF"), |
152 | | .p.extensions = "lvf", |
153 | | .p.flags = AVFMT_GENERIC_INDEX, |
154 | | .read_probe = lvf_probe, |
155 | | .read_header = lvf_read_header, |
156 | | .read_packet = lvf_read_packet, |
157 | | }; |