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https://github.com/nyanmisaka/ffmpeg-rockchip.git
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78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
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* RAW Ingenient MJPEG demuxer
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* Copyright (c) 2005 Alex Beregszaszi
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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 "avformat.h"
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#include "rawdec.h"
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#include "libavutil/intreadwrite.h"
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// http://multimedia.cx/ingenient.txt
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static int ingenient_probe(AVProbeData *p)
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{
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if ( AV_RN32(p->buf) != AV_RN32("MJPG")
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|| p->buf_size < 50
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|| AV_RB16(p->buf + 48) != 0xffd8)
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return 0;
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return AVPROBE_SCORE_MAX * 3 / 4;
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}
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static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size, w, h, unk1, unk2;
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if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G'))
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return AVERROR(EIO); // FIXME
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size = avio_rl32(s->pb);
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w = avio_rl16(s->pb);
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h = avio_rl16(s->pb);
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avio_skip(s->pb, 8); // zero + size (padded?)
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avio_skip(s->pb, 2);
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unk1 = avio_rl16(s->pb);
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unk2 = avio_rl16(s->pb);
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avio_skip(s->pb, 22); // ASCII timestamp
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av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",
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size, w, h, unk1, unk2);
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ret = av_get_packet(s->pb, pkt, size);
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if (ret < 0)
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return ret;
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pkt->stream_index = 0;
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return ret;
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}
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FF_RAWVIDEO_DEMUXER_CLASS(ingenient)
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AVInputFormat ff_ingenient_demuxer = {
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.name = "ingenient",
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.long_name = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),
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.priv_data_size = sizeof(FFRawVideoDemuxerContext),
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.read_probe = ingenient_probe,
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.read_header = ff_raw_video_read_header,
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.read_packet = ingenient_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "cgi", // FIXME
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.raw_codec_id = AV_CODEC_ID_MJPEG,
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.priv_class = &ingenient_demuxer_class,
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};
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