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77 lines
2.4 KiB
77 lines
2.4 KiB
/* |
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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(const 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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const 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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