Real Time Audio Analysis In Linux

linux audio real-time signal-processing alsa
MAckerman picture MAckerman · Mar 31, 2009 · Viewed 11.8k times · Source

I'm wondering what is the recommended audio library to use?

I'm attempting to make a small program that will aid in tuning instruments. (Piano, Guitar, etc.). I've read about ALSA & Marsyas audio libraries.

I'm thinking the idea is to sample data from microphone, do analysis on chunks of 5-10ms (from what I've read). Then perform a FFT to figure out which frequency contains the largest peak.

Answer

joeforker picture joeforker · Apr 1, 2009

This guide should help. Don't use ALSA for your application. Use a higher level API. If you decide you'd like to use JACK, http://jackaudio.org/applications has three instrument tuners you can use as example code.

Related questions

How to select a specific input device with PyAudio

When recording audio via PyAudio, how do you specify the exact input device to use? My computer has two microphones, one built-in and one via USB, and I want to record using the USB mic. The Stream class has an …

Read More
ALSA: Ways to prevent underrun for speaker

I am playing a single channel audio in non-interleaved mode. I am getting underrun when I am writing audio data into speaker : ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred Here is how I write: printf("%d",snd_pcm_…

Read More
The meaning of period in ALSA

I'm using ALSA for and audio application on Linux, I found great docs explain how to use it : 1 and this one. although I have some issues to understand this part of the setup : /* Set number of periods. Periods used to …

Read More