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(const 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, ret; 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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; 60 st->codecpar->codec_id = AV_CODEC_ID_DFA; 61 st->codecpar->width = avio_rl16(pb); 62 st->codecpar->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 ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0) 73 return ret; 74 AV_WL16(st->codecpar->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 (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 return ret; 97 } 98 } else 99 first = 0; 100 frame_size = AV_RL32(pkt->data + pkt->size - 8); 101 if (frame_size > INT_MAX - 4) { 102 av_log(s, AV_LOG_ERROR, "Too large chunk size: %"PRIu32"\n", frame_size); 103 return AVERROR(EIO); 104 } 105 if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) { 106 if (frame_size) { 107 av_log(s, AV_LOG_WARNING, 108 "skipping %"PRIu32" bytes of end-of-frame marker chunk\n", 109 frame_size); 110 avio_skip(pb, frame_size); 111 } 112 return 0; 113 } 114 ret = av_append_packet(pb, pkt, frame_size); 115 if (ret < 0) { 116 return ret; 117 } 118 } 119 120 return 0; 121} 122 123const AVInputFormat ff_dfa_demuxer = { 124 .name = "dfa", 125 .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), 126 .read_probe = dfa_probe, 127 .read_header = dfa_read_header, 128 .read_packet = dfa_read_packet, 129 .flags = AVFMT_GENERIC_INDEX, 130}; 131