Class: Opus::Decoder

Inherits:
Object
  • Object
show all
Defined in:
lib/opus-ruby/decoder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sample_rate, frame_size, channels) ⇒ Decoder

Returns a new instance of Decoder.



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# File 'lib/opus-ruby/decoder.rb', line 33

def initialize( sample_rate, frame_size, channels )
  @sample_rate = sample_rate
  @frame_size = frame_size
  @channels = channels

  @decoder = Opus.opus_decoder_create sample_rate, channels, nil
end

Instance Attribute Details

#channels ⇒ Object (readonly)

Returns the value of attribute channels.



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# File 'lib/opus-ruby/decoder.rb', line 31

def channels
  @channels
end

#frame_size ⇒ Object (readonly)

Returns the value of attribute frame_size.



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# File 'lib/opus-ruby/decoder.rb', line 31

def frame_size
  @frame_size
end

#sample_rate ⇒ Object (readonly)

Returns the value of attribute sample_rate.



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# File 'lib/opus-ruby/decoder.rb', line 31

def sample_rate
  @sample_rate
end

Instance Method Details

#decode(data) ⇒ Object 



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# File 'lib/opus-ruby/decoder.rb', line 49

def decode( data )
  len = data.size

  packet = FFI::MemoryPointer.new :char, len + 1
  packet.put_string 0, data

  max_size = @frame_size * @channels

  decoded = FFI::MemoryPointer.new :short, max_size + 1

  frame_size = Opus.opus_decode @decoder, packet, len, decoded, max_size, 0

  # The times 2 is very important and caused much grief prior to an IRC
  # chat with the Opus devs. Just remember a short is 2 bytes... Seems so
  # simple now...
  return decoded.read_string_length frame_size * 2
end

#destroy ⇒ Object 



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# File 'lib/opus-ruby/decoder.rb', line 41

def destroy
  Opus.opus_decoder_destroy @decoder
end

#reset ⇒ Object 



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# File 'lib/opus-ruby/decoder.rb', line 45

def reset
  Opus.opus_decoder_ctl @decoder, Opus::Constants::OPUS_RESET_STATE, :pointer, nil
end