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;
  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     ScriptWrappable::init(this);
  42     m_processor = adoptPtrWillBeNoop(new WaveShaperProcessor(context->sampleRate(), 1));
  43     setNodeType(NodeTypeWaveShaper);
  44
  45     initialize();
  46 }
  47
  48 void WaveShaperNode::setCurve(Float32Array* curve)
  49 {
  50     ASSERT(isMainThread());
  51     waveShaperProcessor()->setCurve(curve);
  52 }
  53
  54 Float32Array* WaveShaperNode::curve()
  55 {
  56     return waveShaperProcessor()->curve();
  57 }
  58
  59 void WaveShaperNode::setOversample(const String& type, ExceptionState& exceptionState)
  60 {
  61     ASSERT(isMainThread());
  62
  63     // This is to synchronize with the changes made in
  64     // AudioBasicProcessorNode::checkNumberOfChannelsForInput() where we can
  65     // initialize() and uninitialize().
  66     AudioContext::AutoLocker contextLocker(context());
  67
  68     if (type == "none") {
  69         waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSampleNone);
  70     } else if (type == "2x") {
  71         waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample2x);
  72     } else if (type == "4x") {
  73         waveShaperProcessor()->setOversample(WaveShaperProcessor::OverSample4x);
  74     } else {
  75         ASSERT_NOT_REACHED();
  76     }
  77 }
  78
  79 String WaveShaperNode::oversample() const
  80 {
  81     switch (const_cast<WaveShaperNode*>(this)->waveShaperProcessor()->oversample()) {
  82     case WaveShaperProcessor::OverSampleNone:
  83         return "none";
  84     case WaveShaperProcessor::OverSample2x:
  85         return "2x";
  86     case WaveShaperProcessor::OverSample4x:
  87         return "4x";
  88     default:
  89         ASSERT_NOT_REACHED();
  90         return "none";
  91     }
  92 }
  93
  94 } // namespace blink
  95
  96 #endif // ENABLE(WEB_AUDIO)