| 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 | }; |