/* * 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 <inttypes.h> #include "libavutil/intreadwrite.h"#include "avformat.h"#include "demux.h"#include "internal.h" static int dfa_probe(const AVProbeData *p){    if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))        return 0;     if (AV_RL32(p->buf + 16) != 0x80)        return AVPROBE_SCORE_MAX / 4;     return AVPROBE_SCORE_MAX;} static int dfa_read_header(AVFormatContext *s){    AVIOContext *pb = s->pb;    AVStream *st;    int frames, ret;    int version;    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;    }     version = avio_rl16(pb);    frames = avio_rl16(pb);     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;    st->codecpar->codec_id   = AV_CODEC_ID_DFA;    st->codecpar->width      = avio_rl16(pb);    st->codecpar->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;    }    avpriv_set_pts_info(st, 24, mspf, 1000);    avio_skip(pb, 128 - 16); // padding    st->duration = frames;     if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)        return ret;    AV_WL16(st->codecpar->extradata, version);    if (version == 0x100)        st->sample_aspect_ratio = (AVRational){2, 1};     return 0;} static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt){    AVIOContext *pb = s->pb;    uint32_t frame_size;    int ret, first = 1;     if (avio_feof(pb))        return AVERROR_EOF;     if (av_get_packet(pb, pkt, 12) != 12)        return AVERROR(EIO);    while (!avio_feof(pb)) {        if (!first) {            ret = av_append_packet(pb, pkt, 12);            if (ret < 0) {                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: %"PRIu32"\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 %"PRIu32" 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) {            return ret;        }    }     return 0;} const FFInputFormat ff_dfa_demuxer = {    .p.name         = "dfa",    .p.long_name    = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),    .p.flags        = AVFMT_GENERIC_INDEX,    .read_probe     = dfa_probe,    .read_header    = dfa_read_header,    .read_packet    = dfa_read_packet,};