Home | History | Annotate | Download | only in webaudio 
      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/DynamicsCompressorNode.h"
     30 
     31 #include "platform/audio/DynamicsCompressor.h"
     32 #include "modules/webaudio/AudioContext.h"
     33 #include "modules/webaudio/AudioNodeInput.h"
     34 #include "modules/webaudio/AudioNodeOutput.h"
     35 
     36 // Set output to stereo by default.
     37 static const unsigned defaultNumberOfOutputChannels = 2;
     38 
     39 namespace blink {
     40 
     41 DynamicsCompressorNode::DynamicsCompressorNode(AudioContext* context, float sampleRate)
     42     : AudioNode(context, sampleRate)
     43 {
     44     addInput();
     45     addOutput(AudioNodeOutput::create(this, defaultNumberOfOutputChannels));
     46 
     47     setNodeType(NodeTypeDynamicsCompressor);
     48 
     49     m_threshold = AudioParam::create(context, -24);
     50     m_knee = AudioParam::create(context, 30);
     51     m_ratio = AudioParam::create(context, 12);
     52     m_reduction = AudioParam::create(context, 0);
     53     m_attack = AudioParam::create(context, 0.003);
     54     m_release = AudioParam::create(context, 0.250);
     55 
     56     initialize();
     57 }
     58 
     59 DynamicsCompressorNode::~DynamicsCompressorNode()
     60 {
     61     ASSERT(!isInitialized());
     62 }
     63 
     64 void DynamicsCompressorNode::dispose()
     65 {
     66     uninitialize();
     67     AudioNode::dispose();
     68 }
     69 
     70 void DynamicsCompressorNode::process(size_t framesToProcess)
     71 {
     72     AudioBus* outputBus = output(0)->bus();
     73     ASSERT(outputBus);
     74 
     75     float threshold = m_threshold->value();
     76     float knee = m_knee->value();
     77     float ratio = m_ratio->value();
     78     float attack = m_attack->value();
     79     float release = m_release->value();
     80 
     81     m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold);
     82     m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee);
     83     m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio);
     84     m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamAttack, attack);
     85     m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRelease, release);
     86 
     87     m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess);
     88 
     89     float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction);
     90     m_reduction->setValue(reduction);
     91 }
     92 
     93 void DynamicsCompressorNode::initialize()
     94 {
     95     if (isInitialized())
     96         return;
     97 
     98     AudioNode::initialize();
     99     m_dynamicsCompressor = adoptPtr(new DynamicsCompressor(sampleRate(), defaultNumberOfOutputChannels));
    100 }
    101 
    102 void DynamicsCompressorNode::uninitialize()
    103 {
    104     if (!isInitialized())
    105         return;
    106 
    107     m_dynamicsCompressor.clear();
    108     AudioNode::uninitialize();
    109 }
    110 
    111 double DynamicsCompressorNode::tailTime() const
    112 {
    113     return m_dynamicsCompressor->tailTime();
    114 }
    115 
    116 double DynamicsCompressorNode::latencyTime() const
    117 {
    118     return m_dynamicsCompressor->latencyTime();
    119 }
    120 
    121 void DynamicsCompressorNode::trace(Visitor* visitor)
    122 {
    123     visitor->trace(m_threshold);
    124     visitor->trace(m_knee);
    125     visitor->trace(m_ratio);
    126     visitor->trace(m_reduction);
    127     visitor->trace(m_attack);
    128     visitor->trace(m_release);
    129     AudioNode::trace(visitor);
    130 }
    131 
    132 } // namespace blink
    133 
    134 #endif // ENABLE(WEB_AUDIO)
    135