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      1 /*
      2  * Copyright (C) 2010, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #ifndef ConvolverNode_h
     26 #define ConvolverNode_h
     27 
     28 #include "modules/webaudio/AudioNode.h"
     29 #include "wtf/OwnPtr.h"
     30 #include "wtf/RefPtr.h"
     31 #include "wtf/ThreadingPrimitives.h"
     32 
     33 namespace blink {
     34 
     35 class AudioBuffer;
     36 class ExceptionState;
     37 class Reverb;
     38 
     39 class ConvolverNode FINAL : public AudioNode {
     40     DEFINE_WRAPPERTYPEINFO();
     41 public:
     42     static ConvolverNode* create(AudioContext* context, float sampleRate)
     43     {
     44         return adoptRefCountedGarbageCollectedWillBeNoop(new ConvolverNode(context, sampleRate));
     45     }
     46 
     47     virtual ~ConvolverNode();
     48 
     49     // AudioNode
     50     virtual void dispose() OVERRIDE;
     51     virtual void process(size_t framesToProcess) OVERRIDE;
     52     virtual void initialize() OVERRIDE;
     53     virtual void uninitialize() OVERRIDE;
     54 
     55     // Impulse responses
     56     void setBuffer(AudioBuffer*, ExceptionState&);
     57     AudioBuffer* buffer();
     58 
     59     bool normalize() const { return m_normalize; }
     60     void setNormalize(bool normalize) { m_normalize = normalize; }
     61 
     62     virtual void trace(Visitor*) OVERRIDE;
     63 
     64 private:
     65     ConvolverNode(AudioContext*, float sampleRate);
     66 
     67     virtual double tailTime() const OVERRIDE;
     68     virtual double latencyTime() const OVERRIDE;
     69 
     70     OwnPtr<Reverb> m_reverb;
     71     Member<AudioBuffer> m_buffer;
     72 
     73     // This synchronizes dynamic changes to the convolution impulse response with process().
     74     mutable Mutex m_processLock;
     75 
     76     // Normalize the impulse response or not. Must default to true.
     77     bool m_normalize;
     78 };
     79 
     80 } // namespace blink
     81 
     82 #endif // ConvolverNode_h
     83