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bluez-midi: add property for setting latency offset

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This commit is contained in:
Pauli Virtanen 2022-11-20 19:47:15 +02:00
parent 69fcdb5b69
commit 2daa2da773
2 changed files with 22 additions and 0 deletions
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1
src/config/bluetooth.lua.d/50-bluez-midi-config.lua
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@ -36,6 +36,7 @@ bluez_midi_monitor.rules = {
--["node.pause-on-idle"] = false,
--["session.suspend-timeout-seconds"] = 5, -- 0 disables suspend
--["monitor.channel-volumes"] = false,
--["node.latency-offset-msec"] = -10, -- delay (<0) input to reduce jitter
},
},
}

21
src/scripts/monitors/bluez-midi.lua
View file

@ -41,6 +41,19 @@ function rulesApplyProperties(properties)
end
end
function setLatencyOffset(node, offset_msec)
if not offset_msec then
return
end
local props = { "Spa:Pod:Object:Param:Props", "Props" }
props.latencyOffsetNsec = tonumber(offset_msec) * 1000000
local param = Pod.Object(props)
Log.debug(param, "setting latency offset on " .. tostring(node))
node:set_param("Props", param)
end
function createNode(parent, id, type, factory, properties)
properties["factory.name"] = factory
@ -69,6 +82,9 @@ function createNode(parent, id, type, factory, properties)
-- apply properties from config.rules
rulesApplyProperties(properties)
local latency_offset = properties["node.latency-offset-msec"]
properties["node.latency-offset-msec"] = nil
-- create the node
-- it doesn't necessarily need to be a local node,
-- the other Bluetooth parts run in the local process,
@ -77,6 +93,7 @@ function createNode(parent, id, type, factory, properties)
node:activate(Feature.Proxy.BOUND)
parent:store_managed_object(id, node)
id_to_name_table[id] = properties["node.name"]
setLatencyOffset(node, latency_offset)
end
function createMonitor()
@ -128,10 +145,14 @@ function createServers()
}
rulesApplyProperties(node_props)
local latency_offset = node_props["node.latency-offset-msec"]
node_props["node.latency-offset-msec"] = nil
local node = LocalNode("spa-node-factory", node_props)
if node then
node:activate(Feature.Proxy.BOUND)
table.insert(servers, node)
setLatencyOffset(node, latency_offset)
else
Log.message("Failed to create BLE MIDI server.")
end