Audio

'Audio' is a cross-platform audio device interface that allows you to read and write audio streams from the comfort and safety of Ruby.

Currently, only support for OS X has been implemented. Support for Windows and Linux will be added in the future. If you feel like working on either of those, I'm more than happy to take Pull Requests!

The Audio module provides a method that retrieves a list of all of the audio devices available on your system.

require 'audio'

devices = Audio.devices	    # => An Array of Device objects

Each Device object has attributes that wrap the various properties provided by the host operating system. For example, to get a list of device names...

Audio.devices.each do |device|
    puts "Device Name: #{device.device_name}"
end

Running that on a MacBook Pro (late 2013), with a single external microphone connected, produces...

Device Name: Built-in Microphone
Device Name: Built-in Output
Device Name: Blue Snowball

If you just want to use a default device, Audio has you covered.

Audio.default_input     # => Device Name: Built-in Microphone
Audio.default_output    # => Device Name: Built-in Output

You can record audio from a particular device by calling its start method. Once started, the device will continue recording until its stop method is called. If you provide a block parameter to start, it will be called whenever the host OS provides a new buffer of audio samples.

Audio.default_input.start do |*args|
    # Do something fancy
end

sleep 5	    # Record 5 seconds of audio

device.stop

Add this line to your application's Gemfile:

gem 'audio'

And then execute:

$ bundle

Or install it yourself as:

$ gem install audio

Copyright 2015 Brandon Fosdick bfoz@bfoz.net and released under the BSD license.