audio: fix errors and add more attrs for BiquadFilter and StereoPanner

Author: merongivian

opal/browser/audio.rb

@@ -24,8 +24,8 @@ def oscillator
     Node::Oscillator.new(self)
   end
 
-  def delay
-    Node::Delay.new(self)
+  def delay(max_time)
+    Node::Delay.new(self, max_time)
   end
 
   def dynamics_compressor

opal/browser/audio/node.rb

@@ -77,8 +77,8 @@ class Delay
   include Native
   include Pluggable
 
-  def initialize(audio_context, max_time)
-    super `#{audio_context.to_n}.createDelay(max_time || 1)`
+  def initialize(audio_context, max_time = 1)
+    super `#{audio_context.to_n}.createDelay(max_time)`
   end
 
   def time=(time)
@@ -96,6 +96,10 @@ class DynamicsCompressor
 
   alias_native :reduction
 
+  def initialize(audio_context)
+    super `#{audio_context.to_n}.createDynamicsCompressor()`
+  end
+
   def treshold=(treshold)
     `#@native.treshold.value = treshold`
   end
@@ -138,13 +142,27 @@ def release
 end
 
 class BiquadFilter
+  TYPES = %i(lowpass highpass bandpass lowshelf highshelf peaking notch allpass)
+
   include Native
   include Pluggable
 
   def initialize(audio_context)
     super `#{audio_context.to_n}.createBiquadFilter()`
   end
 
+  def type=(type)
+    unless TYPES.include?(type)
+      raise ArgumentError, "type #{type} doesn't exists"
+    end
+
+    `#@native.type =  type`
+  end
+
+  def type
+    `#@native.type`
+  end
+
   def detune=(detune)
     `#@native.detune.value = #{@detune = detune}`
   end
@@ -170,6 +188,8 @@ class StereoPanner
   include Native
   include Pluggable
 
+  alias_native :normalize
+
   def initialize(audio_context)
     super `#{audio_context.to_n}.createStereoPanner()`
   end