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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef AudioProcessor_h 32 #define AudioProcessor_h 33 34 namespace WebCore { 35 36 class AudioBus; 37 38 // AudioProcessor is an abstract base class representing an audio signal processing object with a single input and a single output, 39 // where the number of input channels equals the number of output channels. It can be used as one part of a complex DSP algorithm, 40 // or as the processor for a basic (one input - one output) AudioNode. 41 42 class AudioProcessor { 43 public: AudioProcessor(double sampleRate)44 AudioProcessor(double sampleRate) 45 : m_initialized(false) 46 , m_sampleRate(sampleRate) 47 { 48 } 49 ~AudioProcessor()50 virtual ~AudioProcessor() { } 51 52 // Full initialization can be done here instead of in the constructor. 53 virtual void initialize() = 0; 54 virtual void uninitialize() = 0; 55 56 // Processes the source to destination bus. The number of channels must match in source and destination. 57 virtual void process(AudioBus* source, AudioBus* destination, size_t framesToProcess) = 0; 58 59 // Resets filter state 60 virtual void reset() = 0; 61 62 virtual void setNumberOfChannels(unsigned) = 0; 63 isInitialized()64 bool isInitialized() const { return m_initialized; } 65 sampleRate()66 double sampleRate() const { return m_sampleRate; } 67 68 protected: 69 bool m_initialized; 70 double m_sampleRate; 71 }; 72 73 } // namespace WebCore 74 75 #endif // AudioProcessor_h 76