| /* |
| * 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: |
| * 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. |
| */ |
| |
| #ifndef AudioResampler_h |
| #define AudioResampler_h |
| |
| #include "platform/audio/AudioBus.h" |
| #include "platform/audio/AudioResamplerKernel.h" |
| #include "platform/audio/AudioSourceProvider.h" |
| #include "wtf/Noncopyable.h" |
| #include "wtf/OwnPtr.h" |
| #include "wtf/Vector.h" |
| |
| namespace WebCore { |
| |
| // AudioResampler resamples the audio stream from an AudioSourceProvider. |
| // The audio stream may be single or multi-channel. |
| // The default constructor defaults to single-channel (mono). |
| |
| class PLATFORM_EXPORT AudioResampler { |
| WTF_MAKE_NONCOPYABLE(AudioResampler); |
| public: |
| AudioResampler(); |
| AudioResampler(unsigned numberOfChannels); |
| ~AudioResampler() { } |
| |
| // Given an AudioSourceProvider, process() resamples the source stream into destinationBus. |
| void process(AudioSourceProvider*, AudioBus* destinationBus, size_t framesToProcess); |
| |
| // Resets the processing state. |
| void reset(); |
| |
| void configureChannels(unsigned numberOfChannels); |
| |
| // 0 < rate <= MaxRate |
| void setRate(double rate); |
| double rate() const { return m_rate; } |
| |
| static const double MaxRate; |
| |
| private: |
| double m_rate; |
| Vector<OwnPtr<AudioResamplerKernel> > m_kernels; |
| RefPtr<AudioBus> m_sourceBus; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // AudioResampler_h |