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context: implement dynamic rate

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Add a default.clock.allowed-rates property that lists the possible
rates for the graph.

Add node.rate and node.lock-rate properties to suggest a graph rate
and lock the rate.

Collect the largest clock rate from the nodes and if it is allowed,
try to configure it as the graph rate. Only switch rates when the
driver is IDLE or suspended or when we force a rate.

No alternative samplerates are specified because we first need to
work around a common driver bug (cards with 1 cristal need the same
rate for capture as playback) for this to work.
This commit is contained in:
Wim Taymans 2021-07-30 16:15:34 +02:00
parent 8375d7b2d7
commit 1ff208875c
5 changed files with 144 additions and 35 deletions
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17
src/daemon/pipewire.conf.in
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@ -20,14 +20,15 @@ context.properties = {
core.name = pipewire-0 # core name and socket name
## Properties for the DSP configuration.
#default.clock.rate = 48000
#default.clock.quantum = 1024
#default.clock.min-quantum = 32
#default.clock.max-quantum = 8192
#default.video.width = 640
#default.video.height = 480
#default.video.rate.num = 25
#default.video.rate.denom = 1
#default.clock.rate = 48000
#default.clock.allowed-rates = [ 48000 ]
#default.clock.quantum = 1024
#default.clock.min-quantum = 32
#default.clock.max-quantum = 8192
#default.video.width = 640
#default.video.height = 480
#default.video.rate.num = 25
#default.video.rate.denom = 1
#
# These overrides are only applied when running in a vm.
vm.overrides = {