Module: Castaway::Production::Audio

Included in:
Castaway::Production
Defined in:
lib/castaway/production/audio.rb

Instance Method Summary collapse

Instance Method Details

#_build_intro(clip, state) ⇒ Object 



78
79
80
81
82
83
84
85
86
87
88
89
 
# File 'lib/castaway/production/audio.rb', line 78

def _build_intro(clip, state)
  Chaussettes::Clip.new do |c|
    c.in(state[:input])
    c.out(device: :stdout).type(:aiff).rate(48_000).channels(2)
    c.chain.fade(0, state[:at] + state[:right_delay],
                 state[:speed], type: :linear)

    clip.in(c).type :aiff
  end

  1
end

#_build_last(clip, state) ⇒ Object 



106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
 
# File 'lib/castaway/production/audio.rb', line 106

def _build_last(clip, state)
  return 0 unless state[:at] + state[:info].duration < duration

  Chaussettes::Clip.new do |c|
    c.in(state[:input])
    c.out(device: :stdout).type(:aiff).rate(48_000).channels(2)
    c.chain.trim(state[:at] + state[:info].duration - state[:left_delay]).
      fade(state[:speed], type: :linear).
      pad(state[:at] + state[:info].duration - state[:left_delay])

    clip.in(c).type :aiff
  end

  1
end

#_build_middle(clip, state) ⇒ Object 



91
92
93
94
95
96
97
98
99
100
101
102
103
104
 
# File 'lib/castaway/production/audio.rb', line 91

def _build_middle(clip, state)
  Chaussettes::Clip.new do |c|
    c.in(state[:input])
    c.out(device: :stdout).type(:aiff).rate(48_000).channels(2)
    c.chain.
      trim(state[:at], state[:info].duration).
      vol(state[:adjust]).
      pad(state[:at])

    clip.in(c).type :aiff
  end

  1
end

#_build_overlay(clip, state) ⇒ Object 



122
123
124
125
126
127
128
129
130
131
132
 
# File 'lib/castaway/production/audio.rb', line 122

def _build_overlay(clip, state)
  Chaussettes::Clip.new do |c|
    c.in(state[:overtrack])
    c.out(device: :stdout).type(:aiff).rate(48_000).channels(2)
    c.chain.pad(state[:at])

    clip.in(c).type :aiff
  end

  1
end

#_duck(clip, basis, options) ⇒ Object 



60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
 
# File 'lib/castaway/production/audio.rb', line 60

def _duck(clip, basis, options)
  adjust = options[:adjust] || 0.5
  speed = options[:speed] || 0.5

  state = {
    input: basis, overtrack: options[:clip],
    at: options[:at] || 0,
    adjust: adjust, speed: speed,
    info: Chaussettes::Info.new(options[:clip]),
    right_delay: adjust * speed, left_delay: (1 - adjust) * speed
  }

  count =  _build_intro(clip, state)
  count += _build_middle(clip, state)
  count += _build_last(clip, state)
  count +  _build_overlay(clip, state)
end

#_produce_soundtrack(range) ⇒ Object 



134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
 
# File 'lib/castaway/production/audio.rb', line 134

def _produce_soundtrack(range)
  block = self.class.soundtrack
  return nil unless block

  _next_filename('.aiff').tap do |filename|
    real_filename = filename
    filename = range.truncated? ? _next_filename('.aiff') : real_filename

    Chaussettes::Clip.new do |clip|
      instance_exec(clip, &block)
      clip.out(filename)
      clip.run
    end

    if range.truncated?
      Chaussettes::Clip.new do |clip|
        clip.in(filename)
        clip.chain.trim range.start_time, range.end_time - range.start_time
        clip.out(real_filename)
        clip.run
      end
    end
  end
end

#duck(basis, *overlays) ⇒ Object

Ducks the ‘basis` audio beneath the given `overlays`. Each overlay should be a hash containing at least a `:clip` key, corresponding to a filename to be used for the overlay clip. Additional keys are:

  • ‘:at` (default 0, where in `basis` the overlay should be applied)

  • ‘:adjust` (default 0.5, how much the basis audio should be reduced)

  • ‘:speed` (default 0.5, how many seconds the fade in/out should take)

Returns a new filename representing the results of the duck operation.



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/castaway/production/audio.rb', line 43

def duck(basis, *overlays)
  _next_filename('.aiff').tap do |result|
    Chaussettes::Clip.new do |clip|
      clip.mix.out result

      count = overlays.reduce(0) do |total, options|
        total + _duck(clip, basis, options)
      end

      # restore volume
      clip.chain.vol count

      clip.run
    end
  end
end

#soundclip(id) ⇒ Object

Returns the filename associated with the soundclip with the given id. If the soundclip was declared with a block, the block will be evaluated with a new ‘Chaussettes::Clip` instance, and the a temporary filename containing the resulting audio will be returned,



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/castaway/production/audio.rb', line 11

def soundclip(id)
  @soundclips ||= {}
  @soundclips[id] ||= begin
    definition = self.class.soundclip(id)
    raise "no soundclip #{id.inspect}" unless definition

    case definition
    when String then
      definition
    when Proc then
      _next_filename('.aiff').tap do |filename|
        Chaussettes::Clip.new do |clip|
          instance_exec(clip, &definition)
          clip.out(filename)
          clip.run
        end
      end
    else
      raise ArgumentError, "can't use #{definition.inspect} as soundclip"
    end
  end
end