https://bugs.webkit.org/show_bug.cgi?id=75564

Patch by Xingnan Wang <xingnan.wang@intel.com> on 2012-03-19
Reviewed by Chris Rogers.

Source/WebCore:

Add the DirectConvolver instead of FFTConvolver for the processing of the leading portion of impulse response.

* WebCore.gypi:
* platform/audio/DirectConvolver.cpp: Added.
(WebCore):
(WebCore::DirectConvolver::DirectConvolver):
(WebCore::DirectConvolver::process):
(WebCore::DirectConvolver::reset):
* platform/audio/DirectConvolver.h: Added.
(WebCore):
(DirectConvolver):
(WebCore::DirectConvolver::convolveSize):
* platform/audio/ReverbConvolver.cpp:
(WebCore::ReverbConvolver::ReverbConvolver):
* platform/audio/ReverbConvolver.h:
* platform/audio/ReverbConvolverStage.cpp:
(WebCore::ReverbConvolverStage::ReverbConvolverStage):
(WebCore::ReverbConvolverStage::process):
(WebCore::ReverbConvolverStage::reset):
* platform/audio/ReverbConvolverStage.h:
(WebCore):
(ReverbConvolverStage):

LayoutTests:

No need to check the initial silent part because the latency issue of ConvolverNode is fixed.

* webaudio/convolution-mono-mono-expected.txt:
* webaudio/resources/convolution-testing.js:
(checkTriangularPulse):
(checkTail1):
(checkConvolvedResult.return.var):
(checkConvolvedResult):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111227 268f45cc-cd09-0410-ab3c-d52691b4dbfc