1 /* 2 * Copyright (C) 2010 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 ReverbInputBuffer_h 30 #define ReverbInputBuffer_h 31 32 #include "AudioArray.h" 33 34 namespace WebCore { 35 36 // ReverbInputBuffer is used to buffer input samples for deferred processing by the background threads. 37 class ReverbInputBuffer { 38 public: 39 ReverbInputBuffer(size_t length); 40 41 // The realtime audio thread keeps writing samples here. 42 // The assumption is that the buffer's length is evenly divisible by numberOfFrames (for nearly all cases this will be fine). 43 // FIXME: remove numberOfFrames restriction... 44 void write(float* sourceP, size_t numberOfFrames); 45 46 // Background threads can call this to check if there's anything to read... writeIndex()47 size_t writeIndex() const { return m_writeIndex; } 48 49 // The individual background threads read here (and hope that they can keep up with the buffer writing). 50 // readIndex is updated with the next readIndex to read from... 51 // The assumption is that the buffer's length is evenly divisible by numberOfFrames. 52 // FIXME: remove numberOfFrames restriction... 53 float* directReadFrom(int* readIndex, size_t numberOfFrames); 54 55 void reset(); 56 57 private: 58 AudioFloatArray m_buffer; 59 size_t m_writeIndex; 60 }; 61 62 } // namespace WebCore 63 64 #endif // ReverbInputBuffer_h 65