This code, based on some other vDSP information I found, performs the
DFT in a different fashion, and also pre-converts the spectrum data into
decibel levels, so the DeaDBeeF analyzer calculation code doesn't need
to convert the values itself any more.
Maybe this will also get rid of the use after free problem somewhere in
the audio code? Who knows?
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
DFT should use aligned memory blocks for best results. Also allocate one
extra sample for DFT output, just in case DFT zop is as bad as zrop.
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
Borrowing some DFT code from deadbeef, this implements a simple spectrum
visualization into the main toolbar of the app.
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
