[Webkit-unassigned] [Bug 78043] New: Make it possible to create JavaScriptAudioNode-based Web Audio nodes

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Feb 7 14:45:08 PST 2012


           Summary: Make it possible to create JavaScriptAudioNode-based
                    Web Audio nodes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Audio
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: smus at google.com
                CC: crogers at google.com

I'm trying to create a custom node based on the JavaScriptAudioNode by extending its prototype with a custom function, and then plugging it into the audio graph. Unfortunately, doing this causes a "SyntaxError: Invalid destination node" error, and the audio graph rejects the custom node.

Here's what I'm doing:

1. I extend the context with a createCustomNode call, as follows:

// Augment the context with a createMeterNode call that returns an augmented
// JavaScriptAudioNode.

function registerCustomWebAudioNode(context, constructorName, classObject) {
  // Get the webkitAudioContext and extend its prototype.
  webkitAudioContext.prototype[constructorName] = function() {
    var customNode = new classObject(this);
    customNode.prototype = context.createJavaScriptNode(2048, 1, 1);
    return customNode;

function MeterNode(context) {

MeterNode.prototype.onClip = function(callback) {
  // ...

2. Then, I'm using the custom node as follows:

    // Assuming context, source are initialized earlier.
    meter = context.createMeterNode();
    // Connect source to meter node to destination.

3. I get an error: SyntaxError: Invalid destination node

This sounds like something at the JavaScript - C++ bindings layer.

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