mirror of https://git.videolan.org/git/ffmpeg.git
128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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* CCTV DAT demuxer
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*
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* Copyright (c) 2020 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avio_internal.h"
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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static int dat_probe(const AVProbeData *p)
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{
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if (p->buf_size < 0x2080)
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return 0;
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if (memcmp(p->buf, "luo ", 4))
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return 0;
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if (memcmp(p->buf + 0x1ffc, " oulliu ", 8))
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return 0;
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if (!AV_RL32(p->buf + 0x2004))
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return 0;
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if (memcmp(p->buf + 0x207c, " uil", 4))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int dat_read_header(AVFormatContext *s)
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{
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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avio_seek(s->pb, 0x2000, SEEK_SET);
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return 0;
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}
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static int dat_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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int index, ret, key, stream_id, stream_index, width, height, fps, pkt_size;
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int64_t pts, pos = avio_tell(pb);
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if (avio_feof(pb))
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return AVERROR_EOF;
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if (avio_rb32(pb) != MKBETAG('l', 'i', 'u', ' '))
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return AVERROR_INVALIDDATA;
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stream_id = avio_rl32(pb);
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width = avio_rl32(pb);
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height = avio_rl32(pb);
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fps = avio_rl32(pb);
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avio_skip(pb, 16);
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key = avio_rl32(pb) == 1;
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avio_skip(pb, 4);
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index = avio_rl32(pb);
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avio_skip(pb, 4);
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pts = avio_rl64(pb);
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pkt_size = avio_rl32(pb);
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avio_skip(pb, 64);
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if (pkt_size == 0)
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return AVERROR_EOF;
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for (stream_index = 0; stream_index < s->nb_streams; stream_index++) {
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if (s->streams[stream_index]->id == stream_id)
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break;
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}
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if (stream_index == s->nb_streams) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->id = stream_id;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_H264;
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st->codecpar->width = width;
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st->codecpar->height = height;
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avpriv_set_pts_info(st, 64, 1, fps);
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}
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if (index >= s->nb_streams)
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av_log(s, AV_LOG_WARNING, "Stream index out of range.\n");
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ret = av_get_packet(pb, pkt, pkt_size);
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if (ret < 0)
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return ret;
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pkt->pos = pos;
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pkt->pts = pts;
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pkt->stream_index = stream_index;
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if (key)
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pkt->flags |= AV_PKT_FLAG_KEY;
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return ret;
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}
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const FFInputFormat ff_luodat_demuxer = {
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.p.name = "luodat",
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.p.long_name = NULL_IF_CONFIG_SMALL("Video CCTV DAT"),
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.p.extensions = "dat",
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.p.flags = AVFMT_GENERIC_INDEX,
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.read_probe = dat_probe,
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.read_header = dat_read_header,
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.read_packet = dat_read_packet,
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};
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