| /* |
| * Chronomaster DFA Format Demuxer |
| * Copyright (c) 2011 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| |
| static int dfa_probe(AVProbeData *p) |
| { |
| if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A')) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int dfa_read_header(AVFormatContext *s, |
| AVFormatParameters *ap) |
| { |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| int frames; |
| uint32_t mspf; |
| |
| if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) { |
| av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| avio_skip(pb, 2); // unused |
| frames = avio_rl16(pb); |
| |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codec->codec_id = CODEC_ID_DFA; |
| st->codec->width = avio_rl16(pb); |
| st->codec->height = avio_rl16(pb); |
| mspf = avio_rl32(pb); |
| if (!mspf) { |
| av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n"); |
| mspf = 100; |
| } |
| av_set_pts_info(st, 24, mspf, 1000); |
| avio_skip(pb, 128 - 16); // padding |
| st->duration = frames; |
| |
| return 0; |
| } |
| |
| static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVIOContext *pb = s->pb; |
| uint32_t frame_size; |
| int ret, first = 1; |
| |
| if (pb->eof_reached) |
| return AVERROR_EOF; |
| |
| if (av_get_packet(pb, pkt, 12) != 12) |
| return AVERROR(EIO); |
| while (!pb->eof_reached) { |
| if (!first) { |
| ret = av_append_packet(pb, pkt, 12); |
| if (ret < 0) { |
| av_free_packet(pkt); |
| return ret; |
| } |
| } else |
| first = 0; |
| frame_size = AV_RL32(pkt->data + pkt->size - 8); |
| if (frame_size > INT_MAX - 4) { |
| av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size); |
| return AVERROR(EIO); |
| } |
| if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) { |
| if (frame_size) { |
| av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n", |
| frame_size); |
| avio_skip(pb, frame_size); |
| } |
| return 0; |
| } |
| ret = av_append_packet(pb, pkt, frame_size); |
| if (ret < 0) { |
| av_free_packet(pkt); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_dfa_demuxer = { |
| "dfa", |
| NULL_IF_CONFIG_SMALL("Chronomaster DFA"), |
| 0, |
| dfa_probe, |
| dfa_read_header, |
| dfa_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |