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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 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "modules/webaudio/AnalyserNode.h"
     30 
     31 #include "bindings/v8/ExceptionState.h"
     32 #include "core/dom/ExceptionCode.h"
     33 #include "modules/webaudio/AudioNodeInput.h"
     34 #include "modules/webaudio/AudioNodeOutput.h"
     35 
     36 namespace WebCore {
     37 
     38 AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
     39     : AudioBasicInspectorNode(context, sampleRate, 2)
     40 {
     41     ScriptWrappable::init(this);
     42     setNodeType(NodeTypeAnalyser);
     43     initialize();
     44 }
     45 
     46 AnalyserNode::~AnalyserNode()
     47 {
     48     uninitialize();
     49 }
     50 
     51 void AnalyserNode::process(size_t framesToProcess)
     52 {
     53     AudioBus* outputBus = output(0)->bus();
     54 
     55     if (!isInitialized() || !input(0)->isConnected()) {
     56         outputBus->zero();
     57         return;
     58     }
     59 
     60     AudioBus* inputBus = input(0)->bus();
     61 
     62     // Give the analyser the audio which is passing through this AudioNode.
     63     m_analyser.writeInput(inputBus, framesToProcess);
     64 
     65     // For in-place processing, our override of pullInputs() will just pass the audio data through unchanged if the channel count matches from input to output
     66     // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
     67     if (inputBus != outputBus)
     68         outputBus->copyFrom(*inputBus);
     69 }
     70 
     71 void AnalyserNode::reset()
     72 {
     73     m_analyser.reset();
     74 }
     75 
     76 void AnalyserNode::setFftSize(unsigned size, ExceptionState& es)
     77 {
     78     if (!m_analyser.setFftSize(size))
     79         es.throwDOMException(NotSupportedError);
     80 }
     81 
     82 } // namespace WebCore
     83 
     84 #endif // ENABLE(WEB_AUDIO)
     85