Spectrogram generation

app/controllers/media_controller.rb

@@ -1,5 +1,24 @@
 class MediaController < ApplicationController
+  include Spectrogram
   def index
+    @input_path = './test/fixtures/'
+    @audio = 'TorresianCrow.wav'
+    @input_audio = @input_path + @audio
+    @result = Audio::info(@input_audio)
+  end
+  def audio
+    @input_path = './test/fixtures/'
+    @output_path = './public/tests/'
+
+    @audio = 'TorresianCrow.wav'
+    @modified_audio = 'TorresianCrow.wav'
+
+    @input_audio = @input_path + @audio
+    @output_audio = @output_path + @modified_audio
+
+    @result = Audio::segment(@input_audio, @output_audio)
+  end
+  def spectrogram
     @input_path = './test/fixtures/'
     @output_path = './public/tests/'
 
@@ -9,7 +28,6 @@ def index
     @input_audio = @input_path + @audio
     @output_image = @output_path + @image
 
-    stdout_str, stderr_str, status = Open3.capture3("./vendor/bin/sox/windows/sox.exe  -V \"#{@input_audio}\" -n rate 22050 spectrogram -m -r -l -a -q 249 -w hann -y 257 -X 43.06640625 -z 100 -o \"#{@output_image}\"")
-    @result = [stdout_str, stderr_str, status]
+    @result = Spectrogram::generate(@input_audio, @output_image)
   end
 end

lib/modules/audio.rb

@@ -0,0 +1,33 @@
+module Audio
+
+  @sox_path = "./vendor/bin/sox/windows/sox.exe"
+
+  @sox_arguments_info = "--info"
+  @@my_logger ||= Logger.new("#{Rails.root}/log/my.log")
+
+  def self.info(source)
+    # sox command to create a spectrogram from an audio file
+    command = "#{@sox_path} #{@sox_arguments_info} \"#{source}\""
+
+    # run the command and wait for the result
+    stdout_str, stderr_str, status = Open3.capture3(command)
+
+    # get the audio file information from the stdout_str
+    something = stdout_str.each_line { |substr| p substr.index(':') }
+
+    # package up all the available information and return it
+    result = [ stdout_str, stderr_str, status, File.exist?(source), something ]
+
+  end
+  def self.segment(source, destination)
+    # sox command to create a spectrogram from an audio file
+    command = "#{@sox_path} #{@sox_arguments_verbose} \"#{source}\" #{@sox_arguments_output_audio} #{@sox_arguments_sample_rate} #{@sox_arguments_spectrogram} #{@sox_arguments_output} \"#{destination}\""
+
+    # run the command and wait for the result
+    stdout_str, stderr_str, status = Open3.capture3(command)
+
+    # package up all the available information and return it
+    result = [ stdout_str, stderr_str, status, File.exist?(source), File.exist?(destination) ]
+
+  end
+end

lib/modules/spectrogram.rb

@@ -0,0 +1,17 @@
+module Spectrogram
+  @sox_path = "./vendor/bin/sox/windows/sox.exe"
+  @sox_arguments_verbose = "-V"
+  @sox_arguments_output_audio = "-n"
+  @sox_arguments_sample_rate = "rate 22050"
+  @sox_arguments_spectrogram = "spectrogram -m -r -l -a -q 249 -w hann -y 257 -X 43.06640625 -z 100"
+  @sox_arguments_output = "-o"
+  @@my_logger ||= Logger.new("#{Rails.root}/log/my.log")
+  def self.generate(source, destination)
+    # sox command to create a spectrogram from an audio file
+    command = "#{@sox_path} #{@sox_arguments_verbose} \"#{source}\" #{@sox_arguments_output_audio} #{@sox_arguments_sample_rate} #{@sox_arguments_spectrogram} #{@sox_arguments_output} \"#{destination}\""
+    # run the command and wait for the result
+    stdout_str, stderr_str, status = Open3.capture3(command)
+    # package up all the available information and return it
+    result = [ stdout_str, stderr_str, status, File.exist?(source), File.exist?(destination) ]
+  end
+end