| /* |
| * 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. |
| */ |
| |
| #include <algorithm> |
| #include "third_party/blink/renderer/platform/audio/reverb_accumulation_buffer.h" |
| #include "third_party/blink/renderer/platform/audio/vector_math.h" |
| |
| namespace blink { |
| |
| using namespace vector_math; |
| |
| ReverbAccumulationBuffer::ReverbAccumulationBuffer(size_t length) |
| : buffer_(length), read_index_(0), read_time_frame_(0) {} |
| |
| void ReverbAccumulationBuffer::ReadAndClear(float* destination, |
| size_t number_of_frames) { |
| size_t buffer_length = buffer_.size(); |
| bool is_copy_safe = |
| read_index_ <= buffer_length && number_of_frames <= buffer_length; |
| |
| DCHECK(is_copy_safe); |
| if (!is_copy_safe) |
| return; |
| |
| size_t frames_available = buffer_length - read_index_; |
| size_t number_of_frames1 = std::min(number_of_frames, frames_available); |
| size_t number_of_frames2 = number_of_frames - number_of_frames1; |
| |
| float* source = buffer_.Data(); |
| memcpy(destination, source + read_index_, sizeof(float) * number_of_frames1); |
| memset(source + read_index_, 0, sizeof(float) * number_of_frames1); |
| |
| // Handle wrap-around if necessary |
| if (number_of_frames2 > 0) { |
| memcpy(destination + number_of_frames1, source, |
| sizeof(float) * number_of_frames2); |
| memset(source, 0, sizeof(float) * number_of_frames2); |
| } |
| |
| read_index_ = (read_index_ + number_of_frames) % buffer_length; |
| read_time_frame_ += number_of_frames; |
| } |
| |
| void ReverbAccumulationBuffer::UpdateReadIndex(int* read_index, |
| size_t number_of_frames) const { |
| // Update caller's readIndex |
| *read_index = (*read_index + number_of_frames) % buffer_.size(); |
| } |
| |
| int ReverbAccumulationBuffer::Accumulate(float* source, |
| size_t number_of_frames, |
| int* read_index, |
| size_t delay_frames) { |
| size_t buffer_length = buffer_.size(); |
| |
| size_t write_index = (*read_index + delay_frames) % buffer_length; |
| |
| // Update caller's readIndex |
| *read_index = (*read_index + number_of_frames) % buffer_length; |
| |
| size_t frames_available = buffer_length - write_index; |
| size_t number_of_frames1 = std::min(number_of_frames, frames_available); |
| size_t number_of_frames2 = number_of_frames - number_of_frames1; |
| |
| float* destination = buffer_.Data(); |
| |
| bool is_safe = write_index <= buffer_length && |
| number_of_frames1 + write_index <= buffer_length && |
| number_of_frames2 <= buffer_length; |
| DCHECK(is_safe); |
| if (!is_safe) |
| return 0; |
| |
| Vadd(source, 1, destination + write_index, 1, destination + write_index, 1, |
| number_of_frames1); |
| |
| // Handle wrap-around if necessary |
| if (number_of_frames2 > 0) |
| Vadd(source + number_of_frames1, 1, destination, 1, destination, 1, |
| number_of_frames2); |
| |
| return write_index; |
| } |
| |
| void ReverbAccumulationBuffer::Reset() { |
| buffer_.Zero(); |
| read_index_ = 0; |
| read_time_frame_ = 0; |
| } |
| |
| } // namespace blink |