[Webkit-unassigned] [Bug 125031] New: No audioprocess event or byte frequency data when using HTML5 audio via createMediaElementSource()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125031

           Summary: No audioprocess event or byte frequency data when
                    using HTML5 audio via createMediaElementSource()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.9
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bugs at schillmania.com
                CC: crogers at google.com


Purpose: Attempting to use Web Audio API to get data for visualization during playback of an HTML5 <audio> element.

Observed: 'audioprocess' event does not fire (demo 1), getByteFrequencyData() returns array of zeroes (demo 2.)

Demo 1: AudioContext() + createMediaElementSource() + createScriptProcessor() → audioprocess event
http://isflashdeadyet.com/tests/web-audio-visualization/

Demo 2: AudioContext() + createMediaElementSource() + createAnalyser() / getByteFrequencyData() method
http://isflashdeadyet.com/tests/web-audio-visualization/index-analyser.html

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