Class: PollySpeech

Inherits:
Object
  • Object
show all
Defined in:
lib/pollyspeech.rb

Instance Method Summary collapse

Constructor Details

#initialize(access_key: '', secret_key: '', region: 'us-east-1', voice_id: 'Emma', cache_filepath: 'cache') ⇒ PollySpeech

Returns a new instance of PollySpeech.



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# File 'lib/pollyspeech.rb', line 13

def initialize(access_key: '', secret_key: '', region: 'us-east-1', 
                voice_id: 'Emma', cache_filepath: 'cache')

  @polly = Aws::Polly::Client.new(region: region, 
    credentials: Aws::Credentials.new(access_key, secret_key))
  @voice_id = voice_id
  @cache_filepath = File.join(cache_filepath, voice_id)

end

Instance Method Details

#tts(text = '', audiofile_out = '/tmp/polly.ogg') ⇒ Object 



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# File 'lib/pollyspeech.rb', line 23

def tts(text='', audiofile_out='/tmp/polly.ogg')

  ext = File.extname(audiofile_out)
  out_format = {'.ogg' => 'ogg_vorbis', '.mp3' => 'mp3'}[ext]

  FileUtils.mkdir_p @cache_filepath
  
  h = Digest::MD5.new << text
  filename = File.join(@cache_filepath, h.to_s + ext)
  
  
  # attempts to find the audio file from a local cache instead of 
  # making a relatively expensive request through the web API
  
  if not File.exists? filename then
          
    @polly.synthesize_speech(response_target: filename, text: text, 
      output_format: out_format,  voice_id: @voice_id)

  end    
  
  FileUtils.cp filename, audiofile_out    

end