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2ba45a60 DM |
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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
66 | avio_skip(s->pb, 4); | |
67 | st->codec->width = avio_rl32(s->pb); | |
68 | st->codec->height = avio_rl32(s->pb); | |
69 | avio_skip(s->pb, 4); | |
70 | st->codec->codec_tag = avio_rl32(s->pb); | |
71 | st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, | |
72 | st->codec->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->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
81 | st->codec->codec_tag = avio_rl16(s->pb); | |
82 | st->codec->channels = avio_rl16(s->pb); | |
83 | st->codec->sample_rate = avio_rl16(s->pb); | |
84 | avio_skip(s->pb, 8); | |
85 | st->codec->bits_per_coded_sample = avio_r8(s->pb); | |
86 | st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, | |
87 | st->codec->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 | }; |