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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/ExceptionMessages.h"
     32 #include "bindings/v8/ExceptionState.h"
     33 #include "core/dom/ExceptionCode.h"
     34 #include "modules/webaudio/AudioNodeInput.h"
     35 #include "modules/webaudio/AudioNodeOutput.h"
     36 
     37 namespace WebCore {
     38 
     39 AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
     40     : AudioBasicInspectorNode(context, sampleRate, 2)
     41 {
     42     ScriptWrappable::init(this);
     43     setNodeType(NodeTypeAnalyser);
     44     initialize();
     45 }
     46 
     47 AnalyserNode::~AnalyserNode()
     48 {
     49     uninitialize();
     50 }
     51 
     52 void AnalyserNode::process(size_t framesToProcess)
     53 {
     54     AudioBus* outputBus = output(0)->bus();
     55 
     56     if (!isInitialized() || !input(0)->isConnected()) {
     57         outputBus->zero();
     58         return;
     59     }
     60 
     61     AudioBus* inputBus = input(0)->bus();
     62 
     63     // Give the analyser the audio which is passing through this AudioNode.
     64     m_analyser.writeInput(inputBus, framesToProcess);
     65 
     66     // 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
     67     // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
     68     if (inputBus != outputBus)
     69         outputBus->copyFrom(*inputBus);
     70 }
     71 
     72 void AnalyserNode::setFftSize(unsigned size, ExceptionState& exceptionState)
     73 {
     74     if (!m_analyser.setFftSize(size)) {
     75         exceptionState.throwDOMException(
     76             IndexSizeError,
     77             (size < RealtimeAnalyser::MinFFTSize || size > RealtimeAnalyser::MaxFFTSize) ?
     78                 ExceptionMessages::indexOutsideRange("FFT size", size, RealtimeAnalyser::MinFFTSize, ExceptionMessages::InclusiveBound, RealtimeAnalyser::MaxFFTSize, ExceptionMessages::InclusiveBound)
     79                 : ("The value provided (" + String::number(size) + ") is not a power of two."));
     80     }
     81 }
     82 
     83 void AnalyserNode::setMinDecibels(double k, ExceptionState& exceptionState)
     84 {
     85     if (k < maxDecibels()) {
     86         m_analyser.setMinDecibels(k);
     87     } else {
     88         exceptionState.throwDOMException(
     89             IndexSizeError,
     90             ExceptionMessages::indexExceedsMaximumBound("minDecibels", k, maxDecibels()));
     91     }
     92 }
     93 
     94 void AnalyserNode::setMaxDecibels(double k, ExceptionState& exceptionState)
     95 {
     96     if (k > minDecibels()) {
     97         m_analyser.setMaxDecibels(k);
     98     } else {
     99         exceptionState.throwDOMException(
    100             IndexSizeError,
    101             ExceptionMessages::indexExceedsMinimumBound("maxDecibels", k, minDecibels()));
    102     }
    103 }
    104 
    105 void AnalyserNode::setSmoothingTimeConstant(double k, ExceptionState& exceptionState)
    106 {
    107     if (k >= 0 && k <= 1) {
    108         m_analyser.setSmoothingTimeConstant(k);
    109     } else {
    110         exceptionState.throwDOMException(
    111             IndexSizeError,
    112             ExceptionMessages::indexOutsideRange("smoothing value", k, 0.0, ExceptionMessages::InclusiveBound, 1.0, ExceptionMessages::InclusiveBound));
    113     }
    114 }
    115 
    116 } // namespace WebCore
    117 
    118 #endif // ENABLE(WEB_AUDIO)
    119