[web-audio-api] (AudioBufferSimpl): AudioBuffer simplification (#80)

> Originally reported on W3C Bugzilla [ISSUE-17341](https://www.w3.org/Bugs/Public/show_bug.cgi?id=17341) Tue, 05 Jun 2012 11:34:05 GMT
> Reported by Philip Jägenstedt
> Assigned to 

Audio-ISSUE-48 (AudioBufferSimpl): AudioBuffer simplification [Web Audio API]

http://www.w3.org/2011/audio/track/issues/48

Raised by: Philip Jägenstedt
On product: Web Audio API

The duration attribute fills no purpose, as it can be calculated trivially from sampleRate and length.

In fact, the interface can be reduced to:

    interface AudioBuffer {
        readonly attribute float sampleRate;
        Float32Array[] data;
    }

The number of channels is data.length and the number of samples is data[0].length.

The name data was picked for consistency with the ImageData interface from the 2D canvas context.

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https://github.com/WebAudio/web-audio-api/issues/80