Pass some state to convert and channelmix functions. This makes it
possible to select per channel optimized convert functions but
also makes it possible to implement noise shaping later.
Pass the channelmix matrix and volume in the state.
Handle specialized 2 channel s16 -> f32 conversion
Add a sinc based resampler that, unlike speex, avoids memcpy and
works directly on the source data. It also allows for ssse3
optimizations and aligned loads. It will later switch to table
interpolation when doing variable rate.
Add some const and SPA_RESTRICT to methods
When the input and output is the same, work in passthrough mode
where we simply copy place the input pointer onto the output buffer
without doing a memcpy.
Do memcpy when the resampler is not active.
Pass a message around to make things more extensible later.
Keep fds per message if we ever want to write individual
messages.
Pass number of fds in the message header. We might need this to
close the fds when the proxy is gone.
Add a node subscribe params method that automatically emits the new
params when they change so that we can avoid an enum_params.
Use this in the stream object.
Remove the control messages to update controls in stream, use the
set_param. This is more overhead but allows for notifications to other
clients.
Make it possible to update many controls in one go.
Make a get node method that binds to the server side node of the
client-node immediately. use this in the remote_export and always
return a node proxy.
Use the node proxy to get property updates and signal those in the
stream.
When the context is in error it might be unreffed. Make sure we don't
ever unref the core from the callback because that is not allowed.
Instead, add a defered to the mainloop to clean up later.
Output controls can be linked to many input controls and many input
controls can receive input from many output controls. Keep the control
link information inside the link.
Destroying a local proxy will also attempt to destroy the remote
resource unless the server already did that and told us to remove
the proxy.
Fix some cleanups.
