A quick start on a BinData wrapper for WAV files

wave.rb

#!/usr/bin/ruby

# This is a quick skeleton of how to read a Wave file in ruby using the BinData gem.
# There are many different chunk types and bit depths that should be accounted for!

require 'rubygems'
require 'bindata'

class Wave < BinData::Record
  endian :little
  
  # Riff
  
  int32be :chunk_id
  int32 :chunk_size
  int32be :riff_type
  
  # FMT
  
  int32be :fmt_chunk_id
  int32 :fmt_chunk_size
  int16 :compression_code
  int16 :number_of_channels
  int32 :sample_rate
  int32 :bytes_per_second
  int16 :block_align
  int16 :bits_per_sample
  
  # Data

  string :data_chunk_id, :read_length => 4
  uint32 :data_chunk_size
  array :samples,
        :type => :int16, # Or int24
        :initial_length => 44100
end

# Use it!

wave = Wave.new.read File.open("track.wav")
puts "Duration: #{ wave.data_chunk_size / wave.bytes_per_second } seconds."