src/third_party/WebKit/Source/modules/webaudio/WaveShaperNode.cpp

   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;
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  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)