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2ba45a60 DM |
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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
60 | st->codec->codec_id = AV_CODEC_ID_DFA; | |
61 | st->codec->width = avio_rl16(pb); | |
62 | st->codec->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->codec, 2)) | |
73 | return AVERROR(ENOMEM); | |
74 | AV_WL16(st->codec->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_free_packet(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 | return AVERROR(EIO); | |
105 | } | |
106 | if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) { | |
107 | if (frame_size) { | |
108 | av_log(s, AV_LOG_WARNING, | |
109 | "skipping %"PRIu32" bytes of end-of-frame marker chunk\n", | |
110 | frame_size); | |
111 | avio_skip(pb, frame_size); | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ret = av_append_packet(pb, pkt, frame_size); | |
116 | if (ret < 0) { | |
117 | av_free_packet(pkt); | |
118 | return ret; | |
119 | } | |
120 | } | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | AVInputFormat ff_dfa_demuxer = { | |
126 | .name = "dfa", | |
127 | .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), | |
128 | .read_probe = dfa_probe, | |
129 | .read_header = dfa_read_header, | |
130 | .read_packet = dfa_read_packet, | |
131 | .flags = AVFMT_GENERIC_INDEX, | |
132 | }; |