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 "AnalyserNode.h" 30 31#include "AudioNodeInput.h" 32#include "AudioNodeOutput.h" 33#include "ExceptionCode.h" 34 35namespace WebCore { 36 37AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate) 38 : AudioBasicInspectorNode(context, sampleRate, 2) 39{ 40 setNodeType(NodeTypeAnalyser); 41 42 initialize(); 43} 44 45AnalyserNode::~AnalyserNode() 46{ 47 uninitialize(); 48} 49 50void AnalyserNode::process(size_t framesToProcess) 51{ 52 AudioBus* outputBus = output(0)->bus(); 53 54 if (!isInitialized() || !input(0)->isConnected()) { 55 outputBus->zero(); 56 return; 57 } 58 59 AudioBus* inputBus = input(0)->bus(); 60 61 // Give the analyser the audio which is passing through this AudioNode. 62 m_analyser.writeInput(inputBus, framesToProcess); 63 64 // 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 65 // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo. 66 if (inputBus != outputBus) 67 outputBus->copyFrom(*inputBus); 68} 69 70void AnalyserNode::reset() 71{ 72 m_analyser.reset(); 73} 74 75void AnalyserNode::setFftSize(unsigned size, ExceptionCode& ec) 76{ 77 if (!m_analyser.setFftSize(size)) 78 ec = NOT_SUPPORTED_ERR; 79} 80 81} // namespace WebCore 82 83#endif // ENABLE(WEB_AUDIO) 84