text_to_speech.rb

require 'aws-sdk-polly'

class TextToSpeech
  attr_reader :contents, :polly
  def self.convert(contents)
    new(contents).convert
  end

  def initialize(contents)
    @polly = Aws::Polly::Client.new
    @contents = contents
  end

  def convert
    resp = polly.synthesize_speech({
      output_format: "mp3",
      text: contents,
      voice_id: "Joanna",
    })
    
    IO.copy_stream(resp.audio_stream, 'speech_content.mp3')
  end
end