https://bugs.webkit.org/show_bug.cgi?id=83524

Source/WebCore:

Reviewed by Eric Carlson.

In the Web Audio API, it's possible to connect one AudioNode to another AudioNode.
Similary we should allow an AudioNode to connect to an AudioParam, thus controlling
a parameter with an audio-rate signal.  This is important in many audio processing
applications.

Test: webaudio/audioparam-connect-audioratesignal.html

Simple method name change of AudioParam::hasTimelineValues() to AudioParam::hasSampleAccurateValues().
* Modules/webaudio/AudioGainNode.cpp:
(WebCore::AudioGainNode::process):

* Modules/webaudio/AudioNode.cpp:
(WebCore::AudioNode::connect): Add connect() method from AudioNode -> AudioParam.
(WebCore):
(WebCore::AudioNode::disconnect):
(WebCore::AudioNode::finishDeref):
Use AudioNodeOutput::disconnectAll() instead of AudioNodeOutput::disconnectAllInputs().
* Modules/webaudio/AudioNode.h: Add connect() method from AudioNode -> AudioParam.
(WebCore):
(AudioNode):
* Modules/webaudio/AudioNode.idl: Add connect() method from AudioNode -> AudioParam.

Implement support for an AudioNodeOutput to fanout to multiple AudioParams.
* Modules/webaudio/AudioNodeOutput.cpp:
(WebCore::AudioNodeOutput::AudioNodeOutput):
(WebCore::AudioNodeOutput::updateRenderingState): Update rendering state related to AudioParams.
(WebCore::AudioNodeOutput::pull): pull() must now take into account fanout to AudioParams for in-place processing.
(WebCore::AudioNodeOutput::fanOutCount):
(WebCore):
(WebCore::AudioNodeOutput::paramFanOutCount): New method keeping track of number of connections to AudioParams.
(WebCore::AudioNodeOutput::renderingParamFanOutCount): New method keeping track of number of connections to AudioParams for rendering.
(WebCore::AudioNodeOutput::addParam): Add a connection to an AudioParam.
(WebCore::AudioNodeOutput::removeParam): Remove a connection to an AudioParam.
(WebCore::AudioNodeOutput::disconnectAllParams): Remove all connections to AudioParams.
(WebCore::AudioNodeOutput::disconnectAll): New method to disconnect all AudioNodeInputs and AudioParams.
* Modules/webaudio/AudioNodeOutput.h:
(AudioNodeOutput):

Allow an AudioParam to accept a connection from an AudioNodeOutput, thus being controlled
by an audio-rate signal.
* Modules/webaudio/AudioParam.cpp:
(WebCore::AudioParam::calculateSampleAccurateValues): Calculates sample-accurate values from timeline or an AudioNode.
(WebCore):
(WebCore::AudioParam::calculateAudioRateSignalValues): Calculates sample-accurate values from an AudioNode.
(WebCore::AudioParam::calculateTimelineValues): Calculates sample-accurate values scheduled on the timeline.
(WebCore::AudioParam::connect): Connect from an AudioNodeOutput for control from an audio-rate signal.
(WebCore::AudioParam::disconnect): Disconnect from an AudioNodeOutput.
* Modules/webaudio/AudioParam.h:
(WebCore):
(WebCore::AudioParam::AudioParam):
(WebCore::AudioParam::hasSampleAccurateValues): Change name from hasTimelineValues() and return true
either if we have timeline values or if we've been connected from an AudioNode.
(AudioParam):

Simple method name change of AudioParam::hasTimelineValues() to AudioParam::hasSampleAccurateValues().
* Modules/webaudio/Oscillator.cpp:
(WebCore::Oscillator::calculateSampleAccuratePhaseIncrements):
(WebCore::Oscillator::process):

LayoutTests:

Reviewed by Eric Carlson.

* webaudio/audioparam-connect-audioratesignal-expected.txt: Added.
* webaudio/audioparam-connect-audioratesignal.html: Added.
* webaudio/resources/audio-testing.js:
(createLinearRampBuffer):
(createConstantBuffer):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113769 268f45cc-cd09-0410-ab3c-d52691b4dbfc