I say "convert" because it takes the lazy way and essentially just embeds the
wrappers into the backend. It's done this way because I lack the means to check
any changes, even syntactically. This also means the device's ExtraData field
is still needed.
However, this does mean all the backends are now using the new API. Code
related to the old interface can now be removed.
Unfortunately PulseAudio has a habit of limiting tlength, and trying to
calculate the device's buffer length to write regardless of tlength could
result in some amount always being writable.
This needs to be handled more automatically by the mixer to work correctly.
Otherwise, requiring a property update on resume can put the source into a
playing state with the mixer never playing it, due to not having valid mixing
parameters and the mixing parameters not getting calculated because no updates
are specified by the app (and forcing an update can break deferred updates).
Similar to the recent chorus and flanger changes, the modulation delay now
swings between -n to +n, where n is less than the delay length. This brings up
a slight issue with the linear interpolation, as modff doesn't produce the
correct fraction value for interpolation (it's inverted, with 0 being closer to
the next sample and 1 being closer to the base). So it's using nearest
interpolation for now.
The HF absorption is applied given the source distance, as relative to the
source's immediate environment, with additional absorption being applied given
the room/reverb environment. This does double up the amount of absorption
compared to the dry path, but it can be assumed the initial reflections travel
a longer distance.
This is just for the output limiter right now, but in the future can be used
for the compressor EFX effect. The parameters are also hardcoded, but can be
made configurable after 1.18.
The effects' specified delay is the average delay time, meaning the delay
offset should move between -n and +n relative to the delay, where n <= delay.
