Returns the index for the correct HRTFElevation given the elevation angle.

return true on successful initialization

@TODO the audioParams should be read into buffers in the case that they are time varying

http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious

will count expired pointers

clang-format off

Handle de-zippered panning to a target value.

Handle sample-accurate panning by AudioParam automation.

Satisfy the AudioSourceProvider interface

@TODO remove need for context lock see above

Only safe to call from the read thread.

Pulls on our provider to get rendered audio stream.

Pulls on our provider to get rendered audio stream.

Resets filter state

@TODO remove need for context lock see above

Angles in degrees