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
24 #include "libavutil/intreadwrite.h"
28 static int dfa_probe(AVProbeData *p)
30 if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
33 if (AV_RL32(p->buf + 16) != 0x80)
34 return AVPROBE_SCORE_MAX / 4;
36 return AVPROBE_SCORE_MAX;
39 static int dfa_read_header(AVFormatContext *s)
41 AVIOContext *pb = s->pb;
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;
52 version = avio_rl16(pb);
53 frames = avio_rl16(pb);
55 st = avformat_new_stream(s, NULL);
57 return AVERROR(ENOMEM);
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);
65 av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
68 avpriv_set_pts_info(st, 24, mspf, 1000);
69 avio_skip(pb, 128 - 16); // padding
70 st->duration = frames;
72 if (ff_alloc_extradata(st->codec, 2))
73 return AVERROR(ENOMEM);
74 AV_WL16(st->codec->extradata, version);
76 st->sample_aspect_ratio = (AVRational){2, 1};
81 static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
83 AVIOContext *pb = s->pb;
90 if (av_get_packet(pb, pkt, 12) != 12)
92 while (!pb->eof_reached) {
94 ret = av_append_packet(pb, pkt, 12);
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);
106 if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
108 av_log(s, AV_LOG_WARNING,
109 "skipping %"PRIu32" bytes of end-of-frame marker chunk\n",
111 avio_skip(pb, frame_size);
115 ret = av_append_packet(pb, pkt, frame_size);
125 AVInputFormat ff_dfa_demuxer = {
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,