blob: b8af25609f991e03a1809406d8c0cf628036444d
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 "riff.h" |
25 | |
26 | static int lvf_probe(AVProbeData *p) |
27 | { |
28 | if (AV_RL32(p->buf) != MKTAG('L', 'V', 'F', 'F')) |
29 | return 0; |
30 | |
31 | if (!AV_RL32(p->buf + 16) || AV_RL32(p->buf + 16) > 256) |
32 | return AVPROBE_SCORE_MAX / 8; |
33 | |
34 | return AVPROBE_SCORE_EXTENSION; |
35 | } |
36 | |
37 | static int lvf_read_header(AVFormatContext *s) |
38 | { |
39 | AVStream *st; |
40 | int64_t next_offset; |
41 | unsigned size, nb_streams, id; |
42 | |
43 | avio_skip(s->pb, 16); |
44 | nb_streams = avio_rl32(s->pb); |
45 | if (!nb_streams) |
46 | return AVERROR_INVALIDDATA; |
47 | if (nb_streams > 2) { |
48 | avpriv_request_sample(s, "%d streams", nb_streams); |
49 | return AVERROR_PATCHWELCOME; |
50 | } |
51 | |
52 | avio_skip(s->pb, 1012); |
53 | |
54 | while (!avio_feof(s->pb)) { |
55 | id = avio_rl32(s->pb); |
56 | size = avio_rl32(s->pb); |
57 | next_offset = avio_tell(s->pb) + size; |
58 | |
59 | switch (id) { |
60 | case MKTAG('0', '0', 'f', 'm'): |
61 | st = avformat_new_stream(s, 0); |
62 | if (!st) |
63 | return AVERROR(ENOMEM); |
64 | |
65 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
66 | avio_skip(s->pb, 4); |
67 | st->codecpar->width = avio_rl32(s->pb); |
68 | st->codecpar->height = avio_rl32(s->pb); |
69 | avio_skip(s->pb, 4); |
70 | st->codecpar->codec_tag = avio_rl32(s->pb); |
71 | st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
72 | st->codecpar->codec_tag); |
73 | avpriv_set_pts_info(st, 32, 1, 1000); |
74 | break; |
75 | case MKTAG('0', '1', 'f', 'm'): |
76 | st = avformat_new_stream(s, 0); |
77 | if (!st) |
78 | return AVERROR(ENOMEM); |
79 | |
80 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
81 | st->codecpar->codec_tag = avio_rl16(s->pb); |
82 | st->codecpar->channels = avio_rl16(s->pb); |
83 | st->codecpar->sample_rate = avio_rl16(s->pb); |
84 | avio_skip(s->pb, 8); |
85 | st->codecpar->bits_per_coded_sample = avio_r8(s->pb); |
86 | st->codecpar->codec_id = ff_codec_get_id(ff_codec_wav_tags, |
87 | st->codecpar->codec_tag); |
88 | avpriv_set_pts_info(st, 32, 1, 1000); |
89 | break; |
90 | case 0: |
91 | avio_seek(s->pb, 2048 + 8, SEEK_SET); |
92 | return 0; |
93 | default: |
94 | avpriv_request_sample(s, "id %d", id); |
95 | return AVERROR_PATCHWELCOME; |
96 | } |
97 | |
98 | avio_seek(s->pb, next_offset, SEEK_SET); |
99 | } |
100 | |
101 | return AVERROR_EOF; |
102 | } |
103 | |
104 | static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt) |
105 | { |
106 | unsigned size, flags, timestamp, id; |
107 | int64_t pos; |
108 | int ret, is_video = 0; |
109 | |
110 | pos = avio_tell(s->pb); |
111 | while (!avio_feof(s->pb)) { |
112 | id = avio_rl32(s->pb); |
113 | size = avio_rl32(s->pb); |
114 | |
115 | if (size == 0xFFFFFFFFu) |
116 | return AVERROR_EOF; |
117 | |
118 | switch (id) { |
119 | case MKTAG('0', '0', 'd', 'c'): |
120 | is_video = 1; |
121 | case MKTAG('0', '1', 'w', 'b'): |
122 | if (size < 8) |
123 | return AVERROR_INVALIDDATA; |
124 | timestamp = avio_rl32(s->pb); |
125 | flags = avio_rl32(s->pb); |
126 | ret = av_get_packet(s->pb, pkt, size - 8); |
127 | if (flags & (1 << 12)) |
128 | pkt->flags |= AV_PKT_FLAG_KEY; |
129 | pkt->stream_index = is_video ? 0 : 1; |
130 | pkt->pts = timestamp; |
131 | pkt->pos = pos; |
132 | return ret; |
133 | default: |
134 | ret = avio_skip(s->pb, size); |
135 | } |
136 | |
137 | if (ret < 0) |
138 | return ret; |
139 | } |
140 | |
141 | return AVERROR_EOF; |
142 | } |
143 | |
144 | AVInputFormat ff_lvf_demuxer = { |
145 | .name = "lvf", |
146 | .long_name = NULL_IF_CONFIG_SMALL("LVF"), |
147 | .read_probe = lvf_probe, |
148 | .read_header = lvf_read_header, |
149 | .read_packet = lvf_read_packet, |
150 | .extensions = "lvf", |
151 | .flags = AVFMT_GENERIC_INDEX, |
152 | }; |
153 |