abstract class Eagle::AudioStream

• Eagle::AudioStream
• Reference
• Object

Overview

Audio you generate on the fly, a block of samples at a time: synthesizers, engine hum, procedural music.

Subclass it, implement #fill, and register it with Audio.add_stream.

class Hum < AudioStream
  @phase = 0.0

  def fill(buf : Slice(Float32), frames : Int32, sample_rate : Int32) : Nil
    frames.times do |i|
      s = (Math.sin(@phase) * 0.2).to_f32
      buf[i * 2] = s     # left
      buf[i * 2 + 1] = s # right
      @phase += Math::TAU * 60 / sample_rate
    end
  end
end

Audio.add_stream(Hum.new)

Defined in:

eagle/audio/audio.cr

Instance Method Summary

• #fill(buf : Slice(Float32), frames : Int32, sample_rate : Int32) : Nil

  Writes frames stereo frames of interleaved samples into buf.

• #playing? : Bool

  False after #stop.

• #stop : Nil

  Stops the stream.

• #volume : Float32

  Volume applied to what #fill writes.

• #volume=(volume : Float32)

  Volume applied to what #fill writes.

Instance Method Detail