add QDMC decoder

[ami_stuff]

​https://wiki.multimedia.cx/index.php?title=QDesign_Music_Codec

C:\>ffmpeg -i mono_8khz_8kbps out.wav
ffmpeg version N-78758-g5156578 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
ble-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --
enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-lib
x265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-d
ecklink --enable-zlib
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 27.100 / 57. 27.100
  libavformat    57. 26.100 / 57. 26.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 37.100 /  6. 37.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mono_8khz_8kbps':
  Metadata:
    creation_time   : 2016-06-18 12:28:12
  Duration: 00:00:29.70, start: 0.000000, bitrate: 8 kb/s
    Stream #0:0(eng): Audio: qdmc (QDMC / 0x434D4451), 8000 Hz, 1 channels (defa
ult)
    Metadata:
      creation_time   : 2016-06-18 12:28:12
      handler_name    : Apple Alias Data Handler
No decoder for stream #0:0, filtering impossible
Error opening filters!

[ami_stuff]

​http://www.oldapps.com/quicktime_player.php?old_quicktime=20

[Elon Musk]

How you created such files? Could you generate sine wave of 10 seconds?

[ami_stuff]

Replying to richardpl:

How you created such files? Could you generate sine wave of 10 seconds?

I created them with QT3 - samples attached.

[Elon Musk]

Fixed in 90ac9f4094afc2aa7ee64a7b02df8fb05cbd7d8a.

[ami_stuff]

Great job, thanks.