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manuel_v

Member

Registered: 2015-09-03

Posts: 4

Pulseaudio - Reduce latency for alsa sink

When playing with my USB headset i experience very high latency.

Calling

pactl list sinks

gives me the following output:

Sink #5
	State: RUNNING
	Name: alsa_output.plughw_2_0
	Description: Logitech G35 Headset
	Driver: module-alsa-sink.c
	Sample Specification: s16le 2ch 44100Hz
	Channel Map: front-left,front-right
	Owner Module: 28
	Mute: no
	Volume: front-left: 65536 / 100% / 0,00 dB,   front-right: 65536 / 100% / 0,00 dB
	        balance 0,00
	Base Volume: 65536 / 100% / 0,00 dB
	Monitor Source: alsa_output.plughw_2_0.monitor
	Latency: 109309 usec, configured 99954 usec
	Flags: HARDWARE DECIBEL_VOLUME LATENCY 
	Properties:
		alsa.resolution_bits = "16"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "USB Audio"
		alsa.id = "USB Audio"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "2"
		alsa.card_name = "Logitech G35 Headset"
		alsa.long_card_name = "Logitech Logitech G35 Headset at usb-0000:02:00.0-4, full speed"
		alsa.driver_name = "snd_usb_audio"
		device.bus_path = "pci-0000:02:00.0-usb-0:4:1.0"
		sysfs.path = "/devices/pci0000:00/0000:00:09.0/0000:02:00.0/usb2/2-4/2-4:1.0/sound/card2"
		udev.id = "usb-Logitech_Logitech_G35_Headset-00"
		device.bus = "usb"
		device.vendor.id = "046d"
		device.vendor.name = "Logitech, Inc."
		device.product.id = "0a15"
		device.product.name = "Logitech G35 Headset"
		device.serial = "Logitech_Logitech_G35_Headset"
		device.form_factor = "headset"
		device.string = "plughw:2,0"
		device.buffering.buffer_size = "17632"
		device.buffering.fragment_size = "4408"
		device.access_mode = "mmap"
		device.description = "Logitech G35 Headset"
		device.icon_name = "audio-headset-usb"
		device.intended_roles = "phone"
	Formats:
		pcm

Obviously the configured latency is way too high for gaming. How can I change the configured latency to a lower value?