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authorSteve Block <steveblock@google.com>2011-05-06 11:45:16 +0100
committerSteve Block <steveblock@google.com>2011-05-12 13:44:10 +0100
commitcad810f21b803229eb11403f9209855525a25d57 (patch)
tree29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /WebCore/webaudio/JavaScriptAudioNode.h
parent121b0cf4517156d0ac5111caf9830c51b69bae8f (diff)
downloadexternal_webkit-cad810f21b803229eb11403f9209855525a25d57.zip
external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz
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Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'WebCore/webaudio/JavaScriptAudioNode.h')
-rw-r--r--WebCore/webaudio/JavaScriptAudioNode.h104
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diff --git a/WebCore/webaudio/JavaScriptAudioNode.h b/WebCore/webaudio/JavaScriptAudioNode.h
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-/*
- * Copyright (C) 2010, Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef JavaScriptAudioNode_h
-#define JavaScriptAudioNode_h
-
-#include "ActiveDOMObject.h"
-#include "AudioNode.h"
-#include "EventListener.h"
-#include "EventTarget.h"
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefPtr.h>
-#include <wtf/Vector.h>
-
-namespace WebCore {
-
-class AudioBuffer;
-class AudioContext;
-class AudioProcessingEvent;
-class Float32Array;
-
-// JavaScriptAudioNode is an AudioNode which allows for arbitrary synthesis or processing directly using JavaScript.
-// The API allows for a variable number of inputs and outputs, although it must have at least one input or output.
-// This basic implementation supports no more than one input and output.
-// The "onaudioprocess" attribute is an event listener which will get called periodically with an AudioProcessingEvent which has
-// AudioBuffers for each input and output.
-
-class JavaScriptAudioNode : public AudioNode, public EventTarget {
-public:
- // bufferSize must be one of the following values: 256, 512, 1024, 2048, 4096, 8192, 16384.
- // This value controls how frequently the onaudioprocess event handler is called and how many sample-frames need to be processed each call.
- // Lower numbers for bufferSize will result in a lower (better) latency. Higher numbers will be necessary to avoid audio breakup and glitches.
- // The value chosen must carefully balance between latency and audio quality.
- static PassRefPtr<JavaScriptAudioNode> create(AudioContext*, double sampleRate, size_t bufferSize, unsigned numberOfInputs = 1, unsigned numberOfOutputs = 1);
-
- virtual ~JavaScriptAudioNode();
-
- // AudioNode
- virtual void process(size_t framesToProcess);
- virtual void reset();
- virtual void initialize();
- virtual void uninitialize();
-
- // EventTarget
- virtual ScriptExecutionContext* scriptExecutionContext() const;
- virtual JavaScriptAudioNode* toJavaScriptAudioNode();
- virtual EventTargetData* eventTargetData() { return &m_eventTargetData; }
- virtual EventTargetData* ensureEventTargetData() { return &m_eventTargetData; }
-
- size_t bufferSize() const { return m_bufferSize; }
-
- DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess);
-
- // Reconcile ref/deref which are defined both in AudioNode and EventTarget.
- using AudioNode::ref;
- using AudioNode::deref;
-
-private:
- JavaScriptAudioNode(AudioContext*, double sampleRate, size_t bufferSize, unsigned numberOfInputs, unsigned numberOfOutputs);
-
- static void fireProcessEventDispatch(void* userData);
- void fireProcessEvent();
-
- // Double buffering
- unsigned doubleBufferIndex() const { return m_doubleBufferIndex; }
- void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; }
- unsigned m_doubleBufferIndex;
- unsigned m_doubleBufferIndexForEvent;
- Vector<RefPtr<AudioBuffer> > m_inputBuffers;
- Vector<RefPtr<AudioBuffer> > m_outputBuffers;
-
- virtual void refEventTarget() { ref(); }
- virtual void derefEventTarget() { deref(); }
- EventTargetData m_eventTargetData;
-
- size_t m_bufferSize;
- unsigned m_bufferReadWriteIndex;
- volatile bool m_isRequestOutstanding;
-};
-
-} // namespace WebCore
-
-#endif // JavaScriptAudioNode_h