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mpv: fix race condition in uosc/ao-volume monitoring

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Colin 2024-04-05 22:41:16 +00:00
parent 907933612d
commit 3aba91b360
1 changed files with 16 additions and 11 deletions
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27
hosts/common/programs/mpv/default.nix
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@ -96,7 +96,9 @@ let
### is hard to adjust while screen is on.
### note that only under alsa (`-ao=alsa`) does `ao-volume` actually correspond to system volume.
substituteInPlace src/uosc/main.lua \
--replace-fail "mp.observe_property('volume'" "mp.observe_property('ao-volume'"
--replace-fail \
"mp.observe_property('volume', 'number', create_state_setter('volume'))" \
"mp.observe_property('volume', 'number', update_ao_volume)"
substituteInPlace src/uosc/elements/Volume.lua \
--replace-fail "mp.commandv('set', 'volume'" "mp.commandv('set', 'ao-volume'" \
--replace-fail "mp.set_property_native('volume'" "mp.set_property('ao-volume'"
@ -107,14 +109,20 @@ let
# in the meantime, just query the volume every tick (i.e. frame).
# alternative is mpv's JSON IPC feature, where i could notify its socket whenever pipewire volume changes.
cat <<EOF >> src/uosc/main.lua
function update_ao_volume()
local vol = mp.get_property('ao-volume')
if vol ~= nil then
function update_ao_volume(_, vol)
if vol == nil then
-- vol will be nil if called manually, instead of via observe_property
vol = mp.get_property('ao-volume')
end
if vol == nil then
vol = 0
else
vol = tonumber(vol)
if vol ~= state.volume then
set_state('volume', vol)
request_render()
end
end
if vol ~= state.volume then
set_state('volume', vol)
request_render()
end
end
-- tick seems to occur on every redraw (even when volume is hidden).
@ -124,9 +132,6 @@ let
mp.add_periodic_timer(2, update_ao_volume)
-- invoke immediately to ensure state.volume is non-nil
update_ao_volume()
if state.volume == nil then
state.volume = 0
end
EOF
'';
});