yading@11: /*
yading@11:  * Chronomaster DFA Format Demuxer
yading@11:  * Copyright (c) 2011 Konstantin Shishkov
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: static int dfa_probe(AVProbeData *p)
yading@11: {
yading@11:     if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
yading@11:         return 0;
yading@11: 
yading@11:     return AVPROBE_SCORE_MAX;
yading@11: }
yading@11: 
yading@11: static int dfa_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st;
yading@11:     int frames;
yading@11:     int version;
yading@11:     uint32_t mspf;
yading@11: 
yading@11:     if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
yading@11:         av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     version = avio_rl16(pb);
yading@11:     frames = avio_rl16(pb);
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_DFA;
yading@11:     st->codec->width      = avio_rl16(pb);
yading@11:     st->codec->height     = avio_rl16(pb);
yading@11:     mspf = avio_rl32(pb);
yading@11:     if (!mspf) {
yading@11:         av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
yading@11:         mspf = 100;
yading@11:     }
yading@11:     avpriv_set_pts_info(st, 24, mspf, 1000);
yading@11:     avio_skip(pb, 128 - 16); // padding
yading@11:     st->duration = frames;
yading@11: 
yading@11:     st->codec->extradata = av_malloc(2);
yading@11:     st->codec->extradata_size = 2;
yading@11:     AV_WL16(st->codec->extradata, version);
yading@11:     if (version == 0x100)
yading@11:         st->sample_aspect_ratio = (AVRational){2, 1};
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint32_t frame_size;
yading@11:     int ret, first = 1;
yading@11: 
yading@11:     if (pb->eof_reached)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     if (av_get_packet(pb, pkt, 12) != 12)
yading@11:         return AVERROR(EIO);
yading@11:     while (!pb->eof_reached) {
yading@11:         if (!first) {
yading@11:             ret = av_append_packet(pb, pkt, 12);
yading@11:             if (ret < 0) {
yading@11:                 av_free_packet(pkt);
yading@11:                 return ret;
yading@11:             }
yading@11:         } else
yading@11:             first = 0;
yading@11:         frame_size = AV_RL32(pkt->data + pkt->size - 8);
yading@11:         if (frame_size > INT_MAX - 4) {
yading@11:             av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size);
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11:         if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
yading@11:             if (frame_size) {
yading@11:                 av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n",
yading@11:                        frame_size);
yading@11:                 avio_skip(pb, frame_size);
yading@11:             }
yading@11:             return 0;
yading@11:         }
yading@11:         ret = av_append_packet(pb, pkt, frame_size);
yading@11:         if (ret < 0) {
yading@11:             av_free_packet(pkt);
yading@11:             return ret;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_dfa_demuxer = {
yading@11:     .name           = "dfa",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
yading@11:     .read_probe     = dfa_probe,
yading@11:     .read_header    = dfa_read_header,
yading@11:     .read_packet    = dfa_read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };