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
28static 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
39static 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
81static 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 (pb->eof_reached)
88        return AVERROR_EOF;
89
90    if (av_get_packet(pb, pkt, 12) != 12)
91        return AVERROR(EIO);
92    while (!pb->eof_reached) {
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
125AVInputFormat 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};
133