fast and small AV1 video stream decoder (shared library)

 dav1d is an AOMedia Video 1 (AV1) cross-platform decoder and focused on speed
 and correctness.
 .
 dav1d supports the following features:
  * support for all features of the AV1 bitstream
  * support for all bitdepth, 8, 10 and 12bits
  * support for all chroma subsamplings 4:2:0, 4:2:2, 4:4:4 and grayscale
  * full acceleration for AVX-2 chips
  * full acceleration for SSSE3+ chips
  * full acceleration for ARMv8 chips
  * partial acceleration for ARMv7 chips
 .
 This package provides the shared library.