1 /* 2 * Copyright (C) 2011 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 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef MultiChannelResampler_h 30 #define MultiChannelResampler_h 31 32 #include "platform/audio/SincResampler.h" 33 #include "wtf/Noncopyable.h" 34 #include "wtf/OwnPtr.h" 35 36 namespace blink { 37 38 class AudioBus; 39 40 class PLATFORM_EXPORT MultiChannelResampler { 41 WTF_MAKE_NONCOPYABLE(MultiChannelResampler); 42 public: 43 MultiChannelResampler(double scaleFactor, unsigned numberOfChannels); 44 45 // Process given AudioSourceProvider for streaming applications. 46 void process(AudioSourceProvider*, AudioBus* destination, size_t framesToProcess); 47 48 private: 49 // FIXME: the mac port can have a more highly optimized implementation based on CoreAudio 50 // instead of SincResampler. For now the default implementation will be used on all ports. 51 // https://bugs.webkit.org/show_bug.cgi?id=75118 52 53 // Each channel will be resampled using a high-quality SincResampler. 54 Vector<OwnPtr<SincResampler> > m_kernels; 55 56 unsigned m_numberOfChannels; 57 }; 58 59 } // namespace blink 60 61 #endif // MultiChannelResampler_h 62
