| /* |
| * Copyright (C) 2011, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| |
| #if ENABLE(WEB_AUDIO) |
| |
| #include "DynamicsCompressorNode.h" |
| |
| #include "AudioContext.h" |
| #include "AudioNodeInput.h" |
| #include "AudioNodeOutput.h" |
| #include "DynamicsCompressor.h" |
| |
| // Set output to stereo by default. |
| static const unsigned defaultNumberOfOutputChannels = 2; |
| |
| namespace WebCore { |
| |
| DynamicsCompressorNode::DynamicsCompressorNode(AudioContext* context, float sampleRate) |
| : AudioNode(context, sampleRate) |
| { |
| addInput(adoptPtr(new AudioNodeInput(this))); |
| addOutput(adoptPtr(new AudioNodeOutput(this, defaultNumberOfOutputChannels))); |
| |
| setNodeType(NodeTypeDynamicsCompressor); |
| |
| m_threshold = AudioParam::create("threshold", -24, -100, 0); |
| m_knee = AudioParam::create("knee", 30, 0, 40); |
| m_ratio = AudioParam::create("ratio", 12, 1, 20); |
| m_reduction = AudioParam::create("reduction", 0, -20, 0); |
| |
| m_threshold->setContext(context); |
| m_knee->setContext(context); |
| m_ratio->setContext(context); |
| m_reduction->setContext(context); |
| |
| initialize(); |
| } |
| |
| DynamicsCompressorNode::~DynamicsCompressorNode() |
| { |
| uninitialize(); |
| } |
| |
| void DynamicsCompressorNode::process(size_t framesToProcess) |
| { |
| AudioBus* outputBus = output(0)->bus(); |
| ASSERT(outputBus); |
| |
| float threshold = m_threshold->value(); |
| float knee = m_knee->value(); |
| float ratio = m_ratio->value(); |
| |
| m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold); |
| m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee); |
| m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio); |
| |
| m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess); |
| |
| float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction); |
| m_reduction->setValue(reduction); |
| } |
| |
| void DynamicsCompressorNode::reset() |
| { |
| m_dynamicsCompressor->reset(); |
| } |
| |
| void DynamicsCompressorNode::initialize() |
| { |
| if (isInitialized()) |
| return; |
| |
| AudioNode::initialize(); |
| m_dynamicsCompressor = adoptPtr(new DynamicsCompressor(sampleRate(), defaultNumberOfOutputChannels)); |
| } |
| |
| void DynamicsCompressorNode::uninitialize() |
| { |
| if (!isInitialized()) |
| return; |
| |
| m_dynamicsCompressor.clear(); |
| AudioNode::uninitialize(); |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_AUDIO) |