| /* |
| * 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 "config.h" |
| |
| #if ENABLE(WEB_AUDIO) |
| |
| #include "platform/audio/AudioChannel.h" |
| |
| #include <math.h> |
| #include <algorithm> |
| #include "platform/audio/VectorMath.h" |
| #include "wtf/OwnPtr.h" |
| |
| namespace WebCore { |
| |
| using namespace VectorMath; |
| |
| void AudioChannel::resizeSmaller(size_t newLength) |
| { |
| ASSERT(newLength <= m_length); |
| if (newLength <= m_length) |
| m_length = newLength; |
| } |
| |
| void AudioChannel::scale(float scale) |
| { |
| if (isSilent()) |
| return; |
| |
| vsmul(data(), 1, &scale, mutableData(), 1, length()); |
| } |
| |
| void AudioChannel::copyFrom(const AudioChannel* sourceChannel) |
| { |
| bool isSafe = (sourceChannel && sourceChannel->length() >= length()); |
| ASSERT(isSafe); |
| if (!isSafe) |
| return; |
| |
| if (sourceChannel->isSilent()) { |
| zero(); |
| return; |
| } |
| memcpy(mutableData(), sourceChannel->data(), sizeof(float) * length()); |
| } |
| |
| void AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame) |
| { |
| // Check that range is safe for reading from sourceChannel. |
| bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length(); |
| ASSERT(isRangeSafe); |
| if (!isRangeSafe) |
| return; |
| |
| if (sourceChannel->isSilent() && isSilent()) |
| return; |
| |
| // Check that this channel has enough space. |
| size_t rangeLength = endFrame - startFrame; |
| bool isRangeLengthSafe = rangeLength <= length(); |
| ASSERT(isRangeLengthSafe); |
| if (!isRangeLengthSafe) |
| return; |
| |
| const float* source = sourceChannel->data(); |
| float* destination = mutableData(); |
| |
| if (sourceChannel->isSilent()) { |
| if (rangeLength == length()) |
| zero(); |
| else |
| memset(destination, 0, sizeof(float) * rangeLength); |
| } else |
| memcpy(destination, source + startFrame, sizeof(float) * rangeLength); |
| } |
| |
| void AudioChannel::sumFrom(const AudioChannel* sourceChannel) |
| { |
| bool isSafe = sourceChannel && sourceChannel->length() >= length(); |
| ASSERT(isSafe); |
| if (!isSafe) |
| return; |
| |
| if (sourceChannel->isSilent()) |
| return; |
| |
| if (isSilent()) |
| copyFrom(sourceChannel); |
| else |
| vadd(data(), 1, sourceChannel->data(), 1, mutableData(), 1, length()); |
| } |
| |
| float AudioChannel::maxAbsValue() const |
| { |
| if (isSilent()) |
| return 0; |
| |
| float max = 0; |
| |
| vmaxmgv(data(), 1, &max, length()); |
| |
| return max; |
| } |
| |
| } // WebCore |
| |
| #endif // ENABLE(WEB_AUDIO) |