From d24e36d975005de6e72c257c9d371a578e1cbdba Mon Sep 17 00:00:00 2001
From: Hraban Luyat <hraban@0brg.net>
Date: Mon, 16 Feb 2015 05:18:49 +0100
Subject: [PATCH] [webaudioapi] Specialize event handler type

The event handler was defined to take an argument of generic type Event:
this loses the audio event specific type info as defined in the (unused)
AudioProcessingEvent interface.

This patch declares the onaudioprocessing event handler as accepting an
argument of the correct type.
---
 webaudioapi/waa-tests.ts | 8 ++++++++
 webaudioapi/waa.d.ts     | 6 +++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/webaudioapi/waa-tests.ts b/webaudioapi/waa-tests.ts
index 505f6214e..fc92bd06a 100644
--- a/webaudioapi/waa-tests.ts
+++ b/webaudioapi/waa-tests.ts
@@ -323,3 +323,11 @@ declare var footstepsBuffer: any;
     context.startRendering();
 }
 
+// Test automatic type inference of the audio processing event handler
+() => {
+    var context = new AudioContext();
+    var recorder = context.createScriptProcessor(2048, 1, 1);
+    recorder.onaudioprocess = function (e) {
+        e.inputBuffer;
+    };
+}
diff --git a/webaudioapi/waa.d.ts b/webaudioapi/waa.d.ts
index 128855da8..59fab23ce 100644
--- a/webaudioapi/waa.d.ts
+++ b/webaudioapi/waa.d.ts
@@ -601,6 +601,10 @@ interface AudioBufferSourceNode extends AudioNode {
 interface MediaElementAudioSourceNode extends AudioNode {
 }
 
+interface AudioProcessingEventHandler {
+    (e: AudioProcessingEvent): void;
+}
+
 /**
  * This interface is an AudioNode which can generate, process, or analyse audio directly using JavaScript.
  *
@@ -617,7 +621,7 @@ interface ScriptProcessorNode  extends AudioNode {
     /**
      * An event listener which is called periodically for audio processing. An event of type AudioProcessingEvent will be passed to the event handler.
      */
-    onaudioprocess: EventHandler;
+    onaudioprocess: AudioProcessingEventHandler;
 
     /**
      * The size of the buffer (in sample-frames) which needs to be processed each time onprocessaudio is called. Legal values are (256, 512, 1024, 2048, 4096, 8192, 16384).