Class: Audite

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

Defined Under Namespace

Classes: Events

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(buffer_size = 2**12) ⇒ Audite

Returns a new instance of Audite.



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# File 'lib/audite.rb', line 25

def initialize(buffer_size = 2**12)
  @buffer_size = buffer_size
  @events = Events.new
  @stream = Portaudio.new(@buffer_size)
  @song_list = []
end

Instance Attribute Details

#active ⇒ Object (readonly)

Returns the value of attribute active.



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

def active
  @active
end

#events ⇒ Object (readonly)

Returns the value of attribute events.



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

def events
  @events
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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

def file
  @file
end

#mp3 ⇒ Object (readonly)

Returns the value of attribute mp3.



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

def mp3
  @mp3
end

#song_list ⇒ Object (readonly)

Returns the value of attribute song_list.



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

def song_list
  @song_list
end

#stream ⇒ Object (readonly)

Returns the value of attribute stream.



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

def stream
  @stream
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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

def thread
  @thread
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/audite.rb', line 71

def close
  stream.close
  exit
end

#current_song_name ⇒ Object 



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# File 'lib/audite.rb', line 58

def current_song_name
  File.basename mp3.file
end

#forward(seconds = 2) ⇒ Object 



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# File 'lib/audite.rb', line 186

def forward(seconds = 2)
  seek(position + seconds)
end

#length ⇒ Object 



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# File 'lib/audite.rb', line 143

def length
  @mp3 ? @mp3.length : 0
end

#length_in_seconds ⇒ Object 



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# File 'lib/audite.rb', line 178

def length_in_seconds
  samples_to_seconds(length)
end

#level ⇒ Object 



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# File 'lib/audite.rb', line 41

def level
  @stream.rms
end

#load(files) ⇒ Object 



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# File 'lib/audite.rb', line 104

def load(files)
  files = [] << files unless Array === files
  files.each {|file| queue file }
  set_current_song
end

#position ⇒ Object 



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# File 'lib/audite.rb', line 174

def position
  samples_to_seconds(tell)
end

#process(status) ⇒ Object 



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# File 'lib/audite.rb', line 45

def process(status)
  if [:done, :need_more].include? status
    request_next_song
    events.trigger(:complete)
  else
    events.trigger(:position_change, position)
  end

rescue => e
  $stderr.puts e.message
  $stderr.puts e.backtrace
end

#queue(song) ⇒ Object 



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# File 'lib/audite.rb', line 119

def queue song
  @song_list << Mpg123.new(song)
end

#queued_songs ⇒ Object 



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# File 'lib/audite.rb', line 123

def queued_songs
  @song_list.map {|s| File.basename s.file }
end

#request_next_song ⇒ Object 



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# File 'lib/audite.rb', line 62

def request_next_song
  if songs_in_queue?
    set_current_song
    start_stream
  else
    stop_stream
  end
end

#rewind(seconds = 2) ⇒ Object 



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# File 'lib/audite.rb', line 182

def rewind(seconds = 2)
  seek(position - seconds)
end

#samples_per_frame ⇒ Object 



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# File 'lib/audite.rb', line 135

def samples_per_frame
  @mp3.spf
end

#samples_to_frames(samples) ⇒ Object 



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# File 'lib/audite.rb', line 159

def samples_to_frames(samples)
  samples / samples_per_frame
end

#samples_to_seconds(samples) ⇒ Object 



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# File 'lib/audite.rb', line 155

def samples_to_seconds(samples)
  samples_to_frames(samples) * time_per_frame
end

#seconds_to_frames(seconds) ⇒ Object 



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# File 'lib/audite.rb', line 147

def seconds_to_frames(seconds)
  seconds / time_per_frame
end

#seconds_to_samples(seconds) ⇒ Object 



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# File 'lib/audite.rb', line 151

def seconds_to_samples(seconds)
  seconds_to_frames(seconds) * samples_per_frame
end

#seek(seconds) ⇒ Object 



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# File 'lib/audite.rb', line 163

def seek(seconds)
  if @mp3
    samples = seconds_to_samples(seconds)

    if (0..length).include?(samples)
      @mp3.seek(samples)
      events.trigger(:position_change, position)
    end
  end
end

#set_current_song ⇒ Object 



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# File 'lib/audite.rb', line 114

def set_current_song
  @mp3 = song_list.shift
  start_thread
end

#song_loaded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/audite.rb', line 110

def song_loaded?
  !@mp3.nil?
end

#songs_in_queue? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/audite.rb', line 127

def songs_in_queue?
  !@song_list.empty?
end

#start_stream ⇒ Object 



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# File 'lib/audite.rb', line 76

def start_stream
  unless @active || !song_loaded?
    @active = true
    @stream.start
    start_thread
    events.trigger(:toggle, @active)
  end
end

#start_thread ⇒ Object 



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# File 'lib/audite.rb', line 32

def start_thread
  @thread ||= Thread.start do
    loop do
      process @stream.write_from_mpg(@mp3)
      @stream.wait
    end
  end
end

#stop_stream ⇒ Object 



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# File 'lib/audite.rb', line 85

def stop_stream
  if @active
    @active = false
    @thread = nil unless @thread.alive?
    unless @stream.stopped?
      @stream.stop
      events.trigger(:toggle, @active)
    end
  end
end

#tell ⇒ Object 



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# File 'lib/audite.rb', line 139

def tell
  @mp3 ? @mp3.tell : 0
end

#time_per_frame ⇒ Object 



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# File 'lib/audite.rb', line 131

def time_per_frame
  @mp3.tpf
end

#toggle ⇒ Object 



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# File 'lib/audite.rb', line 96

def toggle
  if @active
    stop_stream
  else
    start_stream
  end
end