avformat/mov: Support reading Avid's metadata for DNXHD codec.

The AALP atom is necessary to properly decode the alpha channel.
Needed for ticket #3707

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/showcqt: add and extend tlength and volume options

Add a tlength option with frequency and timeclamp variable

Add to the volume option support for frequency and timeclamp variable,
   a_weighting, b_weighting and c_weighting functions

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/dctdnoiz: make color [de]correlation less clumsy

This has no impact on overall performance, since the block DCT taking
most of the time anyway.
avfilter/dctdnoiz: remove forward declarations after previous commit
avfilter/dctdnoiz: use 32-bit (float) operations instead of 64 (double) for DCTs

This makes the code about 1.5x faster without any noticeable difference
in the output.
Autodetect jpeg-ls files.