blob: 9858ee7941a75ce65b16bddba18d8e65193d33d0
1 | /* |
2 | * Chronomaster DFA Format Demuxer |
3 | * Copyright (c) 2011 Konstantin Shishkov |
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 <inttypes.h> |
23 | |
24 | #include "libavutil/intreadwrite.h" |
25 | #include "avformat.h" |
26 | #include "internal.h" |
27 | |
28 | static int dfa_probe(AVProbeData *p) |
29 | { |
30 | if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A')) |
31 | return 0; |
32 | |
33 | if (AV_RL32(p->buf + 16) != 0x80) |
34 | return AVPROBE_SCORE_MAX / 4; |
35 | |
36 | return AVPROBE_SCORE_MAX; |
37 | } |
38 | |
39 | static int dfa_read_header(AVFormatContext *s) |
40 | { |
41 | AVIOContext *pb = s->pb; |
42 | AVStream *st; |
43 | int frames; |
44 | int version; |
45 | uint32_t mspf; |
46 | |
47 | if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) { |
48 | av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n"); |
49 | return AVERROR_INVALIDDATA; |
50 | } |
51 | |
52 | version = avio_rl16(pb); |
53 | frames = avio_rl16(pb); |
54 | |
55 | st = avformat_new_stream(s, NULL); |
56 | if (!st) |
57 | return AVERROR(ENOMEM); |
58 | |
59 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
60 | st->codecpar->codec_id = AV_CODEC_ID_DFA; |
61 | st->codecpar->width = avio_rl16(pb); |
62 | st->codecpar->height = avio_rl16(pb); |
63 | mspf = avio_rl32(pb); |
64 | if (!mspf) { |
65 | av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n"); |
66 | mspf = 100; |
67 | } |
68 | avpriv_set_pts_info(st, 24, mspf, 1000); |
69 | avio_skip(pb, 128 - 16); // padding |
70 | st->duration = frames; |
71 | |
72 | if (ff_alloc_extradata(st->codecpar, 2)) |
73 | return AVERROR(ENOMEM); |
74 | AV_WL16(st->codecpar->extradata, version); |
75 | if (version == 0x100) |
76 | st->sample_aspect_ratio = (AVRational){2, 1}; |
77 | |
78 | return 0; |
79 | } |
80 | |
81 | static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt) |
82 | { |
83 | AVIOContext *pb = s->pb; |
84 | uint32_t frame_size; |
85 | int ret, first = 1; |
86 | |
87 | if (avio_feof(pb)) |
88 | return AVERROR_EOF; |
89 | |
90 | if (av_get_packet(pb, pkt, 12) != 12) |
91 | return AVERROR(EIO); |
92 | while (!avio_feof(pb)) { |
93 | if (!first) { |
94 | ret = av_append_packet(pb, pkt, 12); |
95 | if (ret < 0) { |
96 | av_packet_unref(pkt); |
97 | return ret; |
98 | } |
99 | } else |
100 | first = 0; |
101 | frame_size = AV_RL32(pkt->data + pkt->size - 8); |
102 | if (frame_size > INT_MAX - 4) { |
103 | av_log(s, AV_LOG_ERROR, "Too large chunk size: %"PRIu32"\n", frame_size); |
104 | av_packet_unref(pkt); |
105 | return AVERROR(EIO); |
106 | } |
107 | if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) { |
108 | if (frame_size) { |
109 | av_log(s, AV_LOG_WARNING, |
110 | "skipping %"PRIu32" bytes of end-of-frame marker chunk\n", |
111 | frame_size); |
112 | avio_skip(pb, frame_size); |
113 | } |
114 | return 0; |
115 | } |
116 | ret = av_append_packet(pb, pkt, frame_size); |
117 | if (ret < 0) { |
118 | av_packet_unref(pkt); |
119 | return ret; |
120 | } |
121 | } |
122 | |
123 | return 0; |
124 | } |
125 | |
126 | AVInputFormat ff_dfa_demuxer = { |
127 | .name = "dfa", |
128 | .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), |
129 | .read_probe = dfa_probe, |
130 | .read_header = dfa_read_header, |
131 | .read_packet = dfa_read_packet, |
132 | .flags = AVFMT_GENERIC_INDEX, |
133 | }; |
134 |