2 * Chronomaster DFA Format Demuxer
3 * Copyright (c) 2011 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
26 static int dfa_probe(AVProbeData *p)
28 if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
31 return AVPROBE_SCORE_MAX;
34 static int dfa_read_header(AVFormatContext *s)
36 AVIOContext *pb = s->pb;
42 if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
43 av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
44 return AVERROR_INVALIDDATA;
47 version = avio_rl16(pb);
48 frames = avio_rl16(pb);
50 st = avformat_new_stream(s, NULL);
52 return AVERROR(ENOMEM);
54 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
55 st->codec->codec_id = AV_CODEC_ID_DFA;
56 st->codec->width = avio_rl16(pb);
57 st->codec->height = avio_rl16(pb);
60 av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
63 avpriv_set_pts_info(st, 24, mspf, 1000);
64 avio_skip(pb, 128 - 16); // padding
65 st->duration = frames;
67 if (ff_alloc_extradata(st->codec, 2))
68 return AVERROR(ENOMEM);
69 AV_WL16(st->codec->extradata, version);
71 st->sample_aspect_ratio = (AVRational){2, 1};
76 static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
78 AVIOContext *pb = s->pb;
85 if (av_get_packet(pb, pkt, 12) != 12)
87 while (!pb->eof_reached) {
89 ret = av_append_packet(pb, pkt, 12);
96 frame_size = AV_RL32(pkt->data + pkt->size - 8);
97 if (frame_size > INT_MAX - 4) {
98 av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size);
101 if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
103 av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n",
105 avio_skip(pb, frame_size);
109 ret = av_append_packet(pb, pkt, frame_size);
119 AVInputFormat ff_dfa_demuxer = {
121 .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
122 .read_probe = dfa_probe,
123 .read_header = dfa_read_header,
124 .read_packet = dfa_read_packet,
125 .flags = AVFMT_GENERIC_INDEX,