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/ExceptionState.h" 32 #include "core/dom/ExceptionCode.h" 33 #include "modules/webaudio/AudioNodeInput.h" 34 #include "modules/webaudio/AudioNodeOutput.h" 35 36 namespace WebCore { 37 38 AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate) 39 : AudioBasicInspectorNode(context, sampleRate, 2) 40 { 41 ScriptWrappable::init(this); 42 setNodeType(NodeTypeAnalyser); 43 initialize(); 44 } 45 46 AnalyserNode::~AnalyserNode() 47 { 48 uninitialize(); 49 } 50 51 void AnalyserNode::process(size_t framesToProcess) 52 { 53 AudioBus* outputBus = output(0)->bus(); 54 55 if (!isInitialized() || !input(0)->isConnected()) { 56 outputBus->zero(); 57 return; 58 } 59 60 AudioBus* inputBus = input(0)->bus(); 61 62 // Give the analyser the audio which is passing through this AudioNode. 63 m_analyser.writeInput(inputBus, framesToProcess); 64 65 // 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 66 // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo. 67 if (inputBus != outputBus) 68 outputBus->copyFrom(*inputBus); 69 } 70 71 void AnalyserNode::reset() 72 { 73 m_analyser.reset(); 74 } 75 76 void AnalyserNode::setFftSize(unsigned size, ExceptionState& es) 77 { 78 if (!m_analyser.setFftSize(size)) 79 es.throwDOMException(NotSupportedError); 80 } 81 82 } // namespace WebCore 83 84 #endif // ENABLE(WEB_AUDIO) 85