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      1 /*
      2  * Copyright (C) 2011, 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 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "modules/webaudio/WaveShaperNode.h"
     30 
     31 #include "bindings/core/v8/ExceptionMessages.h"
     32 #include "bindings/core/v8/ExceptionState.h"
     33 #include "core/dom/ExceptionCode.h"
     34 #include "wtf/MainThread.h"
     35 
     36 namespace blink {
     37 
     38 WaveShaperNode::WaveShaperNode(AudioContext* context)
     39     : AudioBasicProcessorNode(context, context->sampleRate())
     40 {
     41     m_processor = new WaveShaperProcessor(context->sampleRate(), 1);
     42     setNodeType(NodeTypeWaveShaper);
     43 
     44     initialize();
     45 }
     46 
     47 void WaveShaperNode::setCurve(Float32Array* curve)
     48 {
     49     ASSERT(isMainThread());
     50     waveShaperProcessor()->setCurve(curve);
     51 }
     52 
     53 Float32Array* WaveShaperNode::curve()
     54 {
     55     return waveShaperProcessor()->curve();
     56 }
     57 
     58 void WaveShaperNode::setOversample(const String& type, ExceptionState& exceptionState)
     59 {
     60     ASSERT(isMainThread());
     61 
     62     // This is to synchronize with the changes made in
     63     // AudioBasicProcessorNode::checkNumberOfChannelsForInput() where we can
     64     // initialize() and uninitialize().
     65     AudioContext::AutoLocker contextLocker(context());
     66 
     67     if (type == "none") {
     68         waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSampleNone);
     69     } else if (type == "2x") {
     70         waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample2x);
     71     } else if (type == "4x") {
     72         waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample4x);
     73     } else {
     74         ASSERT_NOT_REACHED();
     75     }
     76 }
     77 
     78 String WaveShaperNode::oversample() const
     79 {
     80     switch (const_cast<WaveShaperNode*>(this)->waveShaperProcessor()->oversample()) {
     81     case WaveShaperProcessor::OverSampleNone:
     82         return "none";
     83     case WaveShaperProcessor::OverSample2x:
     84         return "2x";
     85     case WaveShaperProcessor::OverSample4x:
     86         return "4x";
     87     default:
     88         ASSERT_NOT_REACHED();
     89         return "none";
     90     }
     91 }
     92 
     93 } // namespace blink
     94 
     95 #endif // ENABLE(WEB_AUDIO)
     96