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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /WebCore/platform/audio/AudioResamplerKernel.h | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'WebCore/platform/audio/AudioResamplerKernel.h')
-rw-r--r-- | WebCore/platform/audio/AudioResamplerKernel.h | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/WebCore/platform/audio/AudioResamplerKernel.h b/WebCore/platform/audio/AudioResamplerKernel.h deleted file mode 100644 index 99d877b..0000000 --- a/WebCore/platform/audio/AudioResamplerKernel.h +++ /dev/null @@ -1,76 +0,0 @@ -/* - * 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 AudioResamplerKernel_h -#define AudioResamplerKernel_h - -#include "AudioArray.h" - -namespace WebCore { - -class AudioResampler; - -// AudioResamplerKernel does resampling on a single mono channel. -// It uses a simple linear interpolation for good performance. - -class AudioResamplerKernel { -public: - AudioResamplerKernel(AudioResampler*); - - // getSourcePointer() should be called each time before process() is called. - // Given a number of frames to process (for subsequent call to process()), it returns a pointer and numberOfSourceFramesNeeded - // where sample data should be copied. This sample data provides the input to the resampler when process() is called. - // framesToProcess must be less than or equal to MaxFramesToProcess. - float* getSourcePointer(size_t framesToProcess, size_t* numberOfSourceFramesNeeded); - - // process() resamples framesToProcess frames from the source into destination. - // Each call to process() must be preceded by a call to getSourcePointer() so that source input may be supplied. - // framesToProcess must be less than or equal to MaxFramesToProcess. - void process(float* destination, size_t framesToProcess); - - // Resets the processing state. - void reset(); - - static const size_t MaxFramesToProcess; - -private: - double rate() const; - - AudioResampler* m_resampler; - AudioFloatArray m_sourceBuffer; - - // This is a (floating point) read index on the input stream. - double m_virtualReadIndex; - - // We need to have continuity from one call of process() to the next. - // m_lastValues stores the last two sample values from the last call to process(). - // m_fillIndex represents how many buffered samples we have which can be as many as 2. - // For the first call to process() (or after reset()) there will be no buffered samples. - float m_lastValues[2]; - unsigned m_fillIndex; -}; - -} // namespace WebCore - -#endif // AudioResamplerKernel_h |