[Webkit-unassigned] [Bug 96644] New: Issue with convolver node usage in webkit2:webAudio API

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=96644

           Summary: Issue with convolver node usage in webkit2:webAudio
                    API
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Blocker
          Priority: P1
         Component: Web Audio
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kaustubh.j at samsung.com
                CC: pnormand at igalia.com, crogers at google.com,
                    s.choi at hackerslab.eu, gouache95 at gmail.com


Hi,

I was trying to run few WebAudio API applications from chrome site; especially for convolverNode.

App name: Digital DJ 
Link: http://chromium.googlecode.com/svn/trunk/samples/audio/dj.html
This application did not work properly, for small fraction the audio came and further the silence played out.

After removing the convolverNode; referring the lines in application.
...
line no.: 386: //convolver.connect(preCompressorGain);
...
line no.: 397: //setReverbImpulseResponse('impulse-responses/filter-rhythm2.wav');
...

The application worked perfectly :-) 

To investigate further, with enabled convolverNode and I added data dump logs in following places at same time:
1. ConvolverNode::process() for input(0)->bus(), to check input to convolverNode.
2. webKitWebAudioSrcLoop(), for (const_cast<float*>(priv->bus->channel(index)->data())).

The data for 1. is complete silence whereas for 2. it is proper convoluted stream.

Here it seems that the WebAudio API convolverNode has issue before connecting to other node. 
I tried to other application which are using ConvolverNode; result is same "for small fraction the audio came and further the silence played out".

Please share your views.

Thanks and regards,
kaustubh

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