| /* |
| * Copyright (C) 2010 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT |
| * OWNER OR 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. |
| */ |
| |
| #ifndef AudioProcessor_h |
| #define AudioProcessor_h |
| |
| #include "platform/PlatformExport.h" |
| |
| namespace WebCore { |
| |
| class AudioBus; |
| |
| // AudioProcessor is an abstract base class representing an audio signal processing object with a single input and a single output, |
| // where the number of input channels equals the number of output channels. It can be used as one part of a complex DSP algorithm, |
| // or as the processor for a basic (one input - one output) AudioNode. |
| |
| class PLATFORM_EXPORT AudioProcessor { |
| public: |
| AudioProcessor(float sampleRate, unsigned numberOfChannels) |
| : m_initialized(false) |
| , m_numberOfChannels(numberOfChannels) |
| , m_sampleRate(sampleRate) |
| { |
| } |
| |
| virtual ~AudioProcessor(); |
| |
| // Full initialization can be done here instead of in the constructor. |
| virtual void initialize() = 0; |
| virtual void uninitialize() = 0; |
| |
| // Processes the source to destination bus. The number of channels must match in source and destination. |
| virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) = 0; |
| |
| // Resets filter state |
| virtual void reset() = 0; |
| |
| virtual void setNumberOfChannels(unsigned) = 0; |
| virtual unsigned numberOfChannels() const = 0; |
| |
| bool isInitialized() const { return m_initialized; } |
| |
| float sampleRate() const { return m_sampleRate; } |
| |
| virtual double tailTime() const = 0; |
| virtual double latencyTime() const = 0; |
| |
| protected: |
| bool m_initialized; |
| unsigned m_numberOfChannels; |
| float m_sampleRate; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // AudioProcessor_h |