| /* |
| * 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. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_INPUT_BUFFER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_INPUT_BUFFER_H_ |
| |
| #include <atomic> |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/platform/audio/audio_array.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| |
| namespace blink { |
| |
| // ReverbInputBuffer is used to buffer input samples for deferred processing by |
| // the background threads. |
| class PLATFORM_EXPORT ReverbInputBuffer { |
| DISALLOW_NEW(); |
| |
| public: |
| ReverbInputBuffer(size_t length); |
| |
| // The realtime audio thread keeps writing samples here. |
| // The assumption is that the buffer's length is evenly divisible by |
| // numberOfFrames (for nearly all cases this will be fine). |
| // FIXME: remove numberOfFrames restriction... |
| void Write(const float* source_p, size_t number_of_frames); |
| |
| // Background threads can call this to check if there's anything to read... |
| size_t WriteIndex() const { |
| return write_index_.load(std::memory_order_acquire); |
| } |
| |
| // The individual background threads read here (and hope that they can keep up |
| // with the buffer writing). |
| // readIndex is updated with the next readIndex to read from... |
| // The assumption is that the buffer's length is evenly divisible by |
| // numberOfFrames. |
| // FIXME: remove numberOfFrames restriction... |
| float* DirectReadFrom(int* read_index, size_t number_of_frames); |
| |
| void Reset(); |
| |
| private: |
| void SetWriteIndex(size_t new_index) { |
| write_index_.store(new_index, std::memory_order_release); |
| } |
| |
| AudioFloatArray buffer_; |
| |
| // |write_index_| can be accessed from several threads. Only use |
| // the getter and setter to access it atomically. Don't access |
| // directly! |
| std::atomic_size_t write_index_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ReverbInputBuffer); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_INPUT_BUFFER_H_ |