Read and write .wav sound files in pure Ruby

For Example

Let’s say you have these three Wave files:

This program will concatenate them into one file called one_two_three.wav:


require 'wavefile'
include WaveFile    # To avoid prefixing classes with 'WaveFile::'

FILES_TO_APPEND = ["one.wav", "two.wav", "three.wav"]
SAMPLE_FRAMES_PER_BUFFER = 4096
OUTPUT_FORMAT = Format.new(:stereo, :pcm_16, 44100)

Writer.new("one_two_three.wav", OUTPUT_FORMAT) do |writer|
  FILES_TO_APPEND.each do |file_name|
    Reader.new(file_name).each_buffer(SAMPLE_FRAMES_PER_BUFFER) do |buffer|
      writer.write(buffer)
    end
  end
end

Intrigued? Check out more examples.

Don’t have any idea what this code means? Check out the Getting Started guide.

Installation

First, install the WaveFile gem from rubygems.org:

gem install wavefile

...and include it in your Ruby program:

require 'wavefile'

...or Gemfile:

gem 'wavefile'

Note: It’s recommended that you use a Ruby version manager such as rvm or rbenv. But if using the system Ruby that comes pre-installed on MacOS, you should used sudo gem install wavefile. Otherwise you might run into a file permission error.

Who Made This?

Joel Strait did.