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Diffstat (limited to 'WebCore/webaudio/BiquadProcessor.h')
-rw-r--r-- | WebCore/webaudio/BiquadProcessor.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/WebCore/webaudio/BiquadProcessor.h b/WebCore/webaudio/BiquadProcessor.h new file mode 100644 index 0000000..55dca33 --- /dev/null +++ b/WebCore/webaudio/BiquadProcessor.h @@ -0,0 +1,78 @@ +/* + * 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 BiquadProcessor_h +#define BiquadProcessor_h + +#include "AudioDSPKernel.h" +#include "AudioDSPKernelProcessor.h" +#include "AudioNode.h" +#include "AudioParam.h" +#include "Biquad.h" +#include <wtf/RefPtr.h> + +namespace WebCore { + +// BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters. + +class BiquadProcessor : public AudioDSPKernelProcessor { +public: + enum FilterType { + LowPass2, + HighPass2, + Peaking, + Allpass, + LowShelf, + HighShelf + }; + + BiquadProcessor(FilterType, double sampleRate, size_t numberOfChannels, bool autoInitialize = true); + virtual ~BiquadProcessor(); + + virtual PassOwnPtr<AudioDSPKernel> createKernel(); + + virtual void process(AudioBus* source, AudioBus* destination, size_t framesToProcess); + + bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; } + + AudioParam* parameter1() { return m_parameter1.get(); } + AudioParam* parameter2() { return m_parameter2.get(); } + AudioParam* parameter3() { return m_parameter3.get(); } + + FilterType type() const { return m_type; } + +private: + FilterType m_type; + + RefPtr<AudioParam> m_parameter1; + RefPtr<AudioParam> m_parameter2; + RefPtr<AudioParam> m_parameter3; + + // so DSP kernels know when to re-compute coefficients + bool m_filterCoefficientsDirty; +}; + +} // namespace WebCore + +#endif // BiquadProcessor_h |