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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/core/v8/ExceptionMessages.h"
     32 #include "bindings/core/v8/ExceptionState.h"
     33 #include "core/dom/ExceptionCode.h"
     34 #include "modules/webaudio/AudioNodeInput.h"
     35 #include "modules/webaudio/AudioNodeOutput.h"
     36 
     37 namespace blink {
     38 
     39 AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
     40     : AudioBasicInspectorNode(context, sampleRate, 2)
     41 {
     42     setNodeType(NodeTypeAnalyser);
     43     initialize();
     44 }
     45 
     46 AnalyserNode::~AnalyserNode()
     47 {
     48     ASSERT(!isInitialized());
     49 }
     50 
     51 void AnalyserNode::dispose()
     52 {
     53     uninitialize();
     54     AudioBasicInspectorNode::dispose();
     55 }
     56 
     57 void AnalyserNode::process(size_t framesToProcess)
     58 {
     59     AudioBus* outputBus = output(0)->bus();
     60 
     61     if (!isInitialized() || !input(0)->isConnected()) {
     62         outputBus->zero();
     63         return;
     64     }
     65 
     66     AudioBus* inputBus = input(0)->bus();
     67 
     68     // Give the analyser the audio which is passing through this AudioNode.
     69     m_analyser.writeInput(inputBus, framesToProcess);
     70 
     71     // 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
     72     // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
     73     if (inputBus != outputBus)
     74         outputBus->copyFrom(*inputBus);
     75 }
     76 
     77 void AnalyserNode::setFftSize(unsigned size, ExceptionState& exceptionState)
     78 {
     79     if (!m_analyser.setFftSize(size)) {
     80         exceptionState.throwDOMException(
     81             IndexSizeError,
     82             (size < RealtimeAnalyser::MinFFTSize || size > RealtimeAnalyser::MaxFFTSize) ?
     83                 ExceptionMessages::indexOutsideRange("FFT size", size, RealtimeAnalyser::MinFFTSize, ExceptionMessages::InclusiveBound, RealtimeAnalyser::MaxFFTSize, ExceptionMessages::InclusiveBound)
     84                 : ("The value provided (" + String::number(size) + ") is not a power of two."));
     85     }
     86 }
     87 
     88 void AnalyserNode::setMinDecibels(double k, ExceptionState& exceptionState)
     89 {
     90     if (k < maxDecibels()) {
     91         m_analyser.setMinDecibels(k);
     92     } else {
     93         exceptionState.throwDOMException(
     94             IndexSizeError,
     95             ExceptionMessages::indexExceedsMaximumBound("minDecibels", k, maxDecibels()));
     96     }
     97 }
     98 
     99 void AnalyserNode::setMaxDecibels(double k, ExceptionState& exceptionState)
    100 {
    101     if (k > minDecibels()) {
    102         m_analyser.setMaxDecibels(k);
    103     } else {
    104         exceptionState.throwDOMException(
    105             IndexSizeError,
    106             ExceptionMessages::indexExceedsMinimumBound("maxDecibels", k, minDecibels()));
    107     }
    108 }
    109 
    110 void AnalyserNode::setSmoothingTimeConstant(double k, ExceptionState& exceptionState)
    111 {
    112     if (k >= 0 && k <= 1) {
    113         m_analyser.setSmoothingTimeConstant(k);
    114     } else {
    115         exceptionState.throwDOMException(
    116             IndexSizeError,
    117             ExceptionMessages::indexOutsideRange("smoothing value", k, 0.0, ExceptionMessages::InclusiveBound, 1.0, ExceptionMessages::InclusiveBound));
    118     }
    119 }
    120 
    121 } // namespace blink
    122 
    123 #endif // ENABLE(WEB_AUDIO)
    124