| /* |
| * 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 "third_party/blink/renderer/platform/audio/audio_channel.h" |
| |
| #include <math.h> |
| #include <algorithm> |
| #include "base/numerics/checked_math.h" |
| #include "third_party/blink/renderer/platform/audio/vector_math.h" |
| |
| namespace blink { |
| |
| void AudioChannel::ResizeSmaller(size_t new_length) { |
| DCHECK_LE(new_length, length_); |
| length_ = new_length; |
| } |
| |
| void AudioChannel::Scale(float scale) { |
| if (IsSilent()) |
| return; |
| |
| vector_math::Vsmul(Data(), 1, &scale, MutableData(), 1, length()); |
| } |
| |
| void AudioChannel::CopyFrom(const AudioChannel* source_channel) { |
| DCHECK(source_channel); |
| DCHECK_GE(source_channel->length(), length()); |
| |
| if (source_channel->IsSilent()) { |
| Zero(); |
| return; |
| } |
| memcpy(MutableData(), source_channel->Data(), |
| base::CheckMul(sizeof(float), length()).ValueOrDie()); |
| } |
| |
| void AudioChannel::CopyFromRange(const AudioChannel* source_channel, |
| unsigned start_frame, |
| unsigned end_frame) { |
| // Check that range is safe for reading from sourceChannel. |
| DCHECK(source_channel); |
| DCHECK_LT(start_frame, end_frame); |
| DCHECK_LE(end_frame, source_channel->length()); |
| |
| if (source_channel->IsSilent() && IsSilent()) |
| return; |
| |
| // Check that this channel has enough space. |
| size_t range_length = end_frame - start_frame; |
| DCHECK_LE(range_length, length()); |
| |
| const float* source = source_channel->Data(); |
| float* destination = MutableData(); |
| |
| const size_t safe_length = |
| base::CheckMul(sizeof(float), range_length).ValueOrDie(); |
| if (source_channel->IsSilent()) { |
| if (range_length == length()) |
| Zero(); |
| else |
| memset(destination, 0, safe_length); |
| } else { |
| memcpy(destination, source + start_frame, safe_length); |
| } |
| } |
| |
| void AudioChannel::SumFrom(const AudioChannel* source_channel) { |
| DCHECK(source_channel); |
| DCHECK_GE(source_channel->length(), length()); |
| |
| if (source_channel->IsSilent()) |
| return; |
| |
| if (IsSilent()) { |
| CopyFrom(source_channel); |
| } else { |
| vector_math::Vadd(Data(), 1, source_channel->Data(), 1, MutableData(), 1, |
| length()); |
| } |
| } |
| |
| float AudioChannel::MaxAbsValue() const { |
| if (IsSilent()) |
| return 0; |
| |
| float max = 0; |
| |
| vector_math::Vmaxmgv(Data(), 1, &max, length()); |
| |
| return max; |
| } |
| |
| } // namespace blink |