Set `pulse.module.id` on every node that libpipewire-module-echo-cancel
creates so that one can see in the output of `pactl list {sinks,sources}`
which nodes were created by a particular instance of module-echo-cancel.
Fixes#3541
Add nofail flags to some filter-chain examples to avoid aborting on
startup and leaving the system in a silent state.
Add some more comments to guide people to change the paths to the
filters and config files where needed.
When we are operating in passthrough, let the Start command pass through
to the follower in all cases. Only do the negotiate/buffers when not in
passthrough.
This fixes a case where the buffers are cleared on the alsa node and it
Pauses but then never resumes in a Start because the node is already
started. The real problem is probably somewhere else (in PipeWire) but
for now this will improve things in passthrough.
We only start the ALSA pcm after we get our first buffer.
We still need to do the sync through (and get the number of prefilled
samples) to make sure we set our new timeout and don't keep on waking
up quickly while the graph fetches the first buffer.
To find the largest rate, we need to select the smallest fraction.
This fixes the case where 44100Hz was selected when there are 2 nodes,
one suggesting 44.1Khz and another 48Khz. After this, 48KHz is
selected.
There is no need to have an extra pointer in the struct that is
set to right after the object at initialization and is never modified
because a flexible array member can be used instead.
This has advantages: `struct message` is now smaller, and there is
no extra load when accessing `struct message::data`.
When we duplicate the filter, also duplicate the control values instead
of reusing the same value for all copies. We then duplicate the value
ourselves when setting a control. This makes it possible to later use
this for volume control.
This will call the process function as soon as a new buffer is dequeued.
This can be used to keep the buffer at a certain fill level instead of
the minimal fill level without the flag.
Fixes#3480
Combined with the blit filter the process function of the source is
often called without a valid buffer, which results in a crash. This hack
mitigates this.
