Class: GoogleSpeech::Utility

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

Constant Summary collapse

SOX_ERROR_RE = 
/error:/

Class Method Summary collapse

Class Method Details

.audio_file_duration(path) ⇒ Object 



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# File 'lib/google_speech/utility.rb', line 14

def audio_file_duration(path)
  check_local_file(path)

  soxi_duration, err = run_command("soxi -V0 -D '#{path}'", :nice=>false, :echo_return=>false)
  duration = soxi_duration.chomp.to_f
  duration
end

.check_local_file(file_path) ⇒ Object 



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# File 'lib/google_speech/utility.rb', line 80

def check_local_file(file_path)
  raise "File missing or 0 length: #{file_path}" unless (File.size?(file_path).to_i > 0)
end

.logger ⇒ Object 



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# File 'lib/google_speech/utility.rb', line 84

def logger
  GoogleSpeech.logger        
end

.run_command(command, options = {}) ⇒ Object

Pass the command to run, and various options :timeout - seconds to wait for command to complete, defaults to 2 hours :echo_return - gets the return value via appended ‘; echo $?’, true by default :nice - call with nice -19 by default, set to false to stop, or integer to set different level



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# File 'lib/google_speech/utility.rb', line 38

def run_command(command, options={})
  timeout = options[:timeout] || 7200
  
  # default to adding a nice 19 if nothing specified
  nice = if options.key?(:nice)
    !options[:nice] ? '' : "nice -n #{options[:nice].to_i} "
  else
    'nice -n 19 '
  end
  
  echo_return = (options.key?(:echo_return) && !options[:echo_return]) ? '' : '; echo $?'
  
  cmd = "#{nice}#{command}#{echo_return}"
  
  logger.info "google_speech - run_command: #{cmd}"
  begin
    result = Timeout::timeout(timeout) {
      Open3::popen3(cmd) do |i,o,e|
        out_str = ""
        err_str = ""
        i.close # important!
        o.sync = true
        e.sync = true
        o.each{|line|
          out_str << line
          line.chomp!
          # logger.debug "stdout:    #{line}"
        }
        e.each { |line| 
          err_str << line
          line.chomp!
          # logger.debug "stderr:    #{line}"
        }
        return out_str, err_str
      end
    }
  rescue Timeout::Error => toe
    # logger.debug "run_command:Timeout Error - running command, took longer than #{timeout} seconds to execute: '#{cmd}'"
    raise toe
  end
end

.trim_to_flac(wav_path, duration, flac_path, start, length) ⇒ Object 



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# File 'lib/google_speech/utility.rb', line 22

def trim_to_flac(wav_path, duration, flac_path, start, length)
  check_local_file(wav_path)

  command = "sox -t wav '#{wav_path}' -r 8000 -c 1 -t flac '#{flac_path}' trim #{start} #{length} compand .5,2 -80,-80,-75,-50,-30,-15,0,0 norm -0.1"

  # command = "sox -t wav '#{wav_path}' -t flac '#{flac_path}' trim #{start} #{length} rate 8000"
  
  out, err = run_command(command)
  response = out + err
  response.split("\n").each{ |l| raise("trim_to_flac: error cmd: '#{command}'\nout: '#{response}'") if l =~ SOX_ERROR_RE }
end