Class: MusicBox::Player

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

Constant Summary collapse

Keymap = 
{
  'a' => :play_random_album,
  't' => :play_random_tracks,
  'r' => :play_album_for_current_track,
  'n' => :play_next_track,
  'p' => :play_previous_track,
  ' ' => :toggle_pause,
  '<' => :skip_backward,
  '>' => :skip_forward,
  '^' => :skip_to_beginning,
  'e' => :toggle_equalizer,
  'E' => :next_equalizer,
  'q' => :quit,
  '.' => :show_playlist,
  '?' => :show_keymap,
}
ObservedProperties = 
{
  'playlist' => :playlist,
  'playlist-pos' => :playlist_position,
  'pause' => :pause_state,
  'time-pos' => :time_position,
}
SeekSeconds = 
30

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**params) ⇒ Player

Returns a new instance of Player.



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# File 'lib/musicbox/player.rb', line 34

def initialize(**params)
  {
    mpv_log_level: 'error',
  }.merge(params).each { |k, v| send("#{k}=", v) }
  @playlist_file = Path.new('/tmp/mpv_playlist')
end

Instance Attribute Details

#albums ⇒ Object

Returns the value of attribute albums.



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# File 'lib/musicbox/player.rb', line 29

def albums
  @albums
end

#audio_device ⇒ Object

Returns the value of attribute audio_device.



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# File 'lib/musicbox/player.rb', line 30

def audio_device
  @audio_device
end

#equalizers ⇒ Object

Returns the value of attribute equalizers.



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# File 'lib/musicbox/player.rb', line 32

def equalizers
  @equalizers
end

#mpv_log_level ⇒ Object

Returns the value of attribute mpv_log_level.



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# File 'lib/musicbox/player.rb', line 31

def mpv_log_level
  @mpv_log_level
end

Instance Method Details

#next_equalizer ⇒ Object 



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# File 'lib/musicbox/player.rb', line 243

def next_equalizer
  if @equalizers
    @current_equalizer &&= @equalizers[@equalizers.index(@current_equalizer) + 1]
    @current_equalizer ||= @equalizers.first
    set_current_equalizer
  end
end

#play ⇒ Object

Raises:



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# File 'lib/musicbox/player.rb', line 41

def play
  raise Error, "No albums to play" if @albums.nil? || @albums.empty?
  read_albums
  @dispatcher = IO::Dispatcher.new
  setup_interface
  setup_mpv
  puts "[ready]"
  play_random_album
  @dispatcher.run
end

#play_album_for_current_track ⇒ Object 



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# File 'lib/musicbox/player.rb', line 173

def play_album_for_current_track
  if @properties.playlist_position
    entry = @properties.playlist[@properties.playlist_position]
    track_path = Path.new(entry.filename)
    album = @album_for_track_path[track_path] \
      or raise Error, "Can't determine album for track file: #{track_path}"
    play_tracks(album.tracks)
  else
    puts "no current track"
  end
end

#play_next_track ⇒ Object 



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# File 'lib/musicbox/player.rb', line 149

def play_next_track
  if @properties.playlist_position && @properties.playlist_position < @properties.playlist.count - 1
    @mpv.command('playlist-next')
  else
    puts 'no next track'
  end
end

#play_previous_track ⇒ Object 



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# File 'lib/musicbox/player.rb', line 157

def play_previous_track
  if @properties.playlist_position && @properties.playlist_position > 0
    @mpv.command('playlist-prev')
  else
    puts 'no previous track'
  end
end

#play_random_album ⇒ Object 



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# File 'lib/musicbox/player.rb', line 165

def play_random_album
  play_tracks(random_album.tracks)
end

#play_random_tracks ⇒ Object 



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# File 'lib/musicbox/player.rb', line 169

def play_random_tracks
  play_tracks(random_tracks(length: 10))
end

#play_tracks(tracks) ⇒ Object 



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# File 'lib/musicbox/player.rb', line 232

def play_tracks(tracks)
  @playlist_file.dirname.mkpath
  @playlist_file.write(tracks.map(&:path).join("\n"))
  @mpv.command('loadlist', @playlist_file.to_s)
end

#playlist_changed(value) ⇒ Object 



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# File 'lib/musicbox/player.rb', line 125

def playlist_changed(value)
  @current_track = @playlist = nil
  if @properties.playlist
    @playlist = @properties.playlist.map do |entry|
      track_path = Path.new(entry.filename)
      album = @album_for_track_path[track_path] \
        or raise Error, "Can't determine album for track file: #{track_path}"
      track = album.tracks.find { |t| t.path == track_path } \
        or raise Error, "Can't determine track for track file: #{track_path}"
      @current_track = track if entry.current
      track
    end
  end
  show_playlist
end

#property_changed(name, value) ⇒ Object

callbacks from MPV



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# File 'lib/musicbox/player.rb', line 265

def property_changed(name, value)
# ;;pp(name => value) unless name == 'time-pos'
  key = ObservedProperties[name] or raise
  @properties[key] = value
  send("#{key}_changed", value) rescue NoMethodError
end

#quit ⇒ Object

commands called by interface



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# File 'lib/musicbox/player.rb', line 145

def quit
  Kernel.exit(0)
end

#random_album ⇒ Object 



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# File 'lib/musicbox/player.rb', line 113

def random_album
  @albums.shuffle.first
end

#random_tracks(length:) ⇒ Object 



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# File 'lib/musicbox/player.rb', line 117

def random_tracks(length:)
  tracks = Set.new
  while tracks.length < length
    tracks << random_album.tracks.shuffle.first
  end
  tracks.to_a
end

#read_albums ⇒ Object 



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# File 'lib/musicbox/player.rb', line 104

def read_albums
  @album_for_track_path = {}
  @albums.each do |album|
    album.tracks.each do |track|
      @album_for_track_path[track.path] = album
    end
  end
end

#set_current_equalizer ⇒ Object 



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# File 'lib/musicbox/player.rb', line 251

def set_current_equalizer
  if @current_equalizer
    puts "[equalizer: %s <%s>]" % [
      @current_equalizer.name,
      @equalizer_enabled ? 'enabled' : 'disabled',
    ]
    @mpv.command('af', 'set', @current_equalizer.to_s(enabled: @equalizer_enabled))
  end
end

#setup_interface ⇒ Object 



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# File 'lib/musicbox/player.rb', line 89

def setup_interface
  @stty_old_params = `stty -g`.chomp
  at_exit { system('stty', @stty_old_params) }
  system('stty', 'cbreak', '-echo')
  @dispatcher.add_io_handler(input: STDIN) do |io|
    key = io.sysread(1)
    if (command = Keymap[key])
      puts "[#{command_description(command)}]"
      send(command)
    else
      puts "unknown key: %p" % key
    end
  end
end

#setup_mpv ⇒ Object 



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# File 'lib/musicbox/player.rb', line 52

def setup_mpv
  @mpv = MPVClient.new(
    'mpv-log-level' => @mpv_log_level,
    'audio-device' => @audio_device,
    'audio-display' => 'no',
    'vo' => 'null',
    'volume' => 100)
  @mpv.register_event('log-message') do |event|
    ;;pp(log: event)
  end
  @mpv.command('request_log_messages', @mpv_log_level) if @mpv_log_level
  @properties = HashStruct.new
  ObservedProperties.each do |name, key|
    @mpv.observe_property(name) { |n, v| property_changed(n, v) }
  end
  if @equalizers
    @equalizer_enabled = true
    next_equalizer
  end
  @dispatcher.add_io_handler(input: @mpv.socket) do |io|
    @mpv.process_response
  end
  @dispatcher.add_io_handler(exception: @mpv.socket) do |io|
    shutdown_mpv
  end
  at_exit { shutdown_mpv }
end

#show_keymap ⇒ Object 



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# File 'lib/musicbox/player.rb', line 226

def show_keymap
  Keymap.each do |key, command|
    puts "%-8s %s" % [key_description(key), command_description(command)]
  end
end

#show_playlist ⇒ Object 



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# File 'lib/musicbox/player.rb', line 207

def show_playlist
  if @playlist
    system('clear')
    if @current_track
      @current_track.album.show_cover(width: 'auto', height: 20, preserve_aspect_ratio: false)
      puts
    end
    @playlist.each_with_index do |track, i|
      puts '%1s %2d. %-40.40s | %-40.40s | %-40.40s' % [
        track == @current_track ? '>' : '',
        i + 1,
        track.title,
        track.album.title,
        track.album.artist,
      ]
    end
  end
end

#shutdown_mpv ⇒ Object 



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# File 'lib/musicbox/player.rb', line 80

def shutdown_mpv
  if @mpv
    @mpv.command('quit')
    @dispatcher.remove_io_handler(input: @mpv.socket, exception: @mpv.socket)
    @mpv.stop
    @mpv = nil
  end
end

#skip_backward ⇒ Object 



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# File 'lib/musicbox/player.rb', line 189

def skip_backward
  if @properties.time_position && @properties.time_position > 0
    @mpv.command('seek', -SeekSeconds)
  end
end

#skip_forward ⇒ Object 



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# File 'lib/musicbox/player.rb', line 195

def skip_forward
  if @properties.time_position
    @mpv.command('seek', SeekSeconds)
  end
end

#skip_to_beginning ⇒ Object 



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# File 'lib/musicbox/player.rb', line 201

def skip_to_beginning
  if @properties.time_position && @properties.time_position > 0
    @mpv.command('seek', 0, 'absolute-percent')
  end
end

#toggle_equalizer ⇒ Object 



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# File 'lib/musicbox/player.rb', line 238

def toggle_equalizer
  @equalizer_enabled = !@equalizer_enabled
  set_current_equalizer
end

#toggle_pause ⇒ Object 



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# File 'lib/musicbox/player.rb', line 185

def toggle_pause
  @mpv.set_property('pause', !@properties.pause_state)
end