zita-alsa-pcmi(1)

Okay bestie, let's talk about zita-alsa-pcmi(1) from the General Commands Manual 💖 It's giving tool energy, and the main character is alsa_delay 🧚

✨ NAME ✨

alsa_delay — measure round-trip latency of a soundcard 🎀

💅 SYNOPSIS 💅

alsa_delay playdev captdev fsamp frsize nfrags

🦋 DESCRIPTION 🦋

Okay so this tool is literally built to measure the round-trip latency of a soundcard 😭 To set it up, start the program and connect everything 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 — the ALSA playback device, like hw:0 🔊
• captdev — the ALSA capture device, like hw:0 🎤
• fsamp — the sample rate, like 48000 ✨
• frsize — the period size, like 256 🍓
• nfrags — the number of fragments, like 2 🌈

🎀 EXAMPLES 🎀

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

alsa_delay hw:0 hw:0 48000 2048 10

🧚 NOTES 🧚

alsa_delay is a port of jack_delay (by the same author) to ALSA 🦋 Same author, same energy, new platform, periodt 💜

👑 AUTHOR 👑

zita-alsa-pcmi was written by Fons Adriaensen <fons@linuxaudio.org> 💅

This manual page was written by IOhannes m zmoelnig <zmoelnig@iem.at> for the Debian project (but may be used by others) 🫶

And that's the tea ☕ The source is zita-alsa-pcmi, dated July 2013, and it's still giving 💖🌈