text: /*
   * RAW Ingenient MJPEG demuxer
   * Copyright (c) 2005 Alex Beregszaszi
   *
   * This file is part of Libav.
   *
   * Libav 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.
   *
   * Libav 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 Libav; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include "avformat.h"
  #include "rawdec.h"
  
  // http://www.artificis.hu/files/texts/ingenient.txt
  static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
  {
      int ret, size, w, h, unk1, unk2;
  
      if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G'))
          return AVERROR(EIO); // FIXME
  
      size = avio_rl32(s->pb);
  
      w = avio_rl16(s->pb);
      h = avio_rl16(s->pb);
  
      avio_skip(s->pb, 8); // zero + size (padded?)
      avio_skip(s->pb, 2);
      unk1 = avio_rl16(s->pb);
      unk2 = avio_rl16(s->pb);
      avio_skip(s->pb, 22); // ASCII timestamp
  
      av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",
          size, w, h, unk1, unk2);
  
      if (av_new_packet(pkt, size) < 0)
          return AVERROR(ENOMEM);
  
      pkt->pos = avio_tell(s->pb);
      pkt->stream_index = 0;
      ret = avio_read(s->pb, pkt->data, size);
      if (ret < 0) {
          av_free_packet(pkt);
          return ret;
      }
      pkt->size = ret;
      return ret;
  }
  
  FF_RAWVIDEO_DEMUXER_CLASS(ingenient)
  
  AVInputFormat ff_ingenient_demuxer = {
      .name           = "ingenient",
      .long_name      = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),
      .priv_data_size = sizeof(FFRawVideoDemuxerContext),
      .read_header    = ff_raw_video_read_header,
      .read_packet    = ingenient_read_packet,
      .flags= AVFMT_GENERIC_INDEX,
      .extensions = "cgi", // FIXME
      .value = CODEC_ID_MJPEG,
      .priv_class     = &ingenient_demuxer_class,
  };
  