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alsa_delay - Online in the Cloud

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This is the command alsa_delay that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


alsa_delay - measure round-trip latency of a soundcard

SYNOPSIS


alsa_delay playdev captdev fsamp frsize nfrags

DESCRIPTION


This tool can be used to measure the round-trip latency of a soundcard. To do this, start
the program and connect like this:
alsa_delay -> playdev -> cable from soundcard output to input -> captdev -> alsa_delay

alsa_delay should be able to measure the round-trip latency with an accuracy of around
1/1000 of a sample. The assumption is, that the latency is more or less independent of
frequency, and that the cable between soundcard output and input has virtually zero
latency.

ARGUMENTS


playdev
ALSA playback device (e.g.: hw:0)

captdev
ALSA capture device (e.g.: hw:0)

fsamp Sample rate (e.g.: 48000)

frsize Period size (e.g.: 256)

nfrags Number of fragments (e.g.: 2)

EXAMPLES


This will measure and display the round-trip latency of soundcard hw:0 using 48kHz
samplerate, and 10 fragments each 2048 samples.
alsa_delay hw:0 hw:0 48000 2048 10

NOTES


alsa_delay is a port of jack_delay (by the same author) to ALSA.

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