qdrw: support 1bpp

[ami_stuff]

C:\>ffmpeg -i C:\mono.pct
ffmpeg version 3.2.git Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.6.2 (GCC)
  configuration: --disable-pthreads --enable-gpl --disable-ffprobe
  libavutil      55. 47.100 / 55. 47.100
  libavcodec     57. 79.100 / 57. 79.100
  libavformat    57. 66.102 / 57. 66.102
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 73.100 /  6. 73.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[qdraw @ 0672d740] Warning: not compiled with thread support, using thread emula
tion
[qdraw @ 0672d740] QuickDraw version 1 is not implemented. Update your FFmpeg ve
rsion to the newest one from Git. If the problem still occurs, it means that you
r file has a feature which has not been implemented.
[qdraw @ 0672d740] If you want to help, upload a sample of this file to ftp://up
load.ffmpeg.org/incoming/ and contact the ffmpeg-devel mailing list. (ffmpeg-dev
el@ffmpeg.org)
[image2 @ 06723ba0] decoding for stream 0 failed
[image2 @ 06723ba0] Could not find codec parameters for stream 0 (Video: qdraw,
none, 1024x768): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, image2, from 'C:\mono.pct':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 19891 kb/s
    Stream #0:0: Video: qdraw, none, 1024x768, 25 tbr, 25 tbn, 25 tbc
At least one output file must be specified

[Elon Musk]

Could you create version 2 file?

[ami_stuff]

attached what lead created

[ami_stuff]

this should be able to decode v1 files:

​http://www.paintlib.de/paintlib/