When the port IO_Buffers is set, do a fade-in of the next buffer data
into the final mixed output.
When the port IO Buffers in cleared, do a fade-out of that last sample.
Add a zeroramp.duration property that controls the length in seconds of
the fade-in/out curve. By default, set this to 5ms.
The fade-in and fade-outs avoid popping noise from sudden DC voltage
changes when ports a linked and unlinked.
It will also trigger when the upstream peer is paused, because that will
also remove the IO Buffers from the mixer ports.
Handle MONO layout as a real layout, not just like FC. This means it
does not share the FC mixing weights.
Only distribute and combine MONO channels when the target is also
MONO, enable normalization in this case.
Otherwise downmix and upmix the mono channels like any other channel,
which will make it respect the upmix and other settings.
Change some tests with this new way of doing things.
Fixes#3010
this->monitor enabled adds an additional port in reconfigure_mode. If
there was already the maximum 64, this will crash.
Make maximum number of ports one larger than max channels to avoid
problems.
Add a new PortConfig parameter to configure ports of elements that
are marked with the SPA_NODE_FLAG_*_PORT_CONFIG. This is used to
configure the operation of the audioconver/audioadapter nodes and
how it should convert the internal format. We want to use the
Profile parameter only for cases where there is an enumeration of
values, like with device configuration.
Add unit tests for audioconvert and adapter to check if they handle
PortConfig correctly.
Make the media session use the PortConfig to dynamically configure
the device nodes.
Remove audio-dsp, it is not used anymore and can/should be implemented
with a simple audioconvert spa node now and some PortConfig.
