ReverbInputBuffer.h (3058B)
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 "mozilla/Atomics.h" 33 #include "mozilla/MemoryReporting.h" 34 #include "nsTArray.h" 35 36 namespace WebCore { 37 38 // ReverbInputBuffer is used to buffer input samples for deferred processing by 39 // the background threads. 40 class ReverbInputBuffer { 41 public: 42 explicit ReverbInputBuffer(size_t length); 43 44 // The realtime audio thread keeps writing samples here. 45 // The assumption is that the buffer's length is evenly divisible by 46 // numberOfFrames (for nearly all cases this will be fine). 47 // FIXME: remove numberOfFrames restriction... 48 void write(const float* sourceP, size_t numberOfFrames); 49 50 // Background threads can call this to check if there's anything to read... 51 size_t writeIndex() const { return m_writeIndex; } 52 53 // The individual background threads read here (and hope that they can keep up 54 // with the buffer writing). readIndex is updated with the next readIndex to 55 // read from... The assumption is that the buffer's length is evenly divisible 56 // by numberOfFrames. 57 // FIXME: remove numberOfFrames restriction... 58 float* directReadFrom(int* readIndex, size_t numberOfFrames); 59 60 void reset(); 61 62 size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const { 63 return m_buffer.ShallowSizeOfExcludingThis(aMallocSizeOf); 64 } 65 66 private: 67 nsTArray<float> m_buffer; 68 mozilla::Atomic<size_t, mozilla::ReleaseAcquire> m_writeIndex; 69 }; 70 71 } // namespace WebCore 72 73 #endif // ReverbInputBuffer_h