15abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick/* 25abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * Copyright (C) 2010 Google Inc. All rights reserved. 35abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 45abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * Redistribution and use in source and binary forms, with or without 55abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * modification, are permitted provided that the following conditions 65abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * are met: 75abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 85abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 1. Redistributions of source code must retain the above copyright 95abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * notice, this list of conditions and the following disclaimer. 105abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 2. Redistributions in binary form must reproduce the above copyright 115abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * notice, this list of conditions and the following disclaimer in the 125abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * documentation and/or other materials provided with the distribution. 135abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 145abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * its contributors may be used to endorse or promote products derived 155abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * from this software without specific prior written permission. 165abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 175abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 185abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 195abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 205abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 215abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 225abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 235abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 245abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 255abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 265abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 275abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick */ 285abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 295abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#include "config.h" 305abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 315abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#if ENABLE(WEB_AUDIO) 325abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 335abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#include "AudioChannel.h" 345abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 35e14391e94c850b8bd03680c23b38978db68687a8John Reck#include "VectorMath.h" 365abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#include <algorithm> 375abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#include <math.h> 385abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#include <wtf/OwnPtr.h> 395abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 405abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merricknamespace WebCore { 415abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 42e14391e94c850b8bd03680c23b38978db68687a8John Reckusing namespace VectorMath; 43e14391e94c850b8bd03680c23b38978db68687a8John Reck 445abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickvoid AudioChannel::scale(double scale) 455abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick{ 465abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick float s = static_cast<float>(scale); 475abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick vsmul(data(), 1, &s, data(), 1, length()); 485abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} 495abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 505abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickvoid AudioChannel::copyFrom(const AudioChannel* sourceChannel) 515abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick{ 525abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick bool isSafe = (sourceChannel && sourceChannel->length() >= length()); 535abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick ASSERT(isSafe); 545abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick if (!isSafe) 555abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick return; 565abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 575abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick memcpy(data(), sourceChannel->data(), sizeof(float) * length()); 585abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} 595abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 605abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickvoid AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame) 615abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick{ 625abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // Check that range is safe for reading from sourceChannel. 635abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length(); 645abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick ASSERT(isRangeSafe); 655abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick if (!isRangeSafe) 665abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick return; 675abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 685abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // Check that this channel has enough space. 695abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick size_t rangeLength = endFrame - startFrame; 705abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick bool isRangeLengthSafe = rangeLength <= length(); 715abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick ASSERT(isRangeLengthSafe); 725abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick if (!isRangeLengthSafe) 735abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick return; 745abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 755abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick const float* source = sourceChannel->data(); 765abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick float* destination = data(); 775abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick memcpy(destination, source + startFrame, sizeof(float) * rangeLength); 785abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} 795abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 805abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickvoid AudioChannel::sumFrom(const AudioChannel* sourceChannel) 815abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick{ 825abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick bool isSafe = sourceChannel && sourceChannel->length() >= length(); 835abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick ASSERT(isSafe); 845abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick if (!isSafe) 855abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick return; 865abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 875abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick vadd(data(), 1, sourceChannel->data(), 1, data(), 1, length()); 885abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} 895abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 905abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickfloat AudioChannel::maxAbsValue() const 915abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick{ 925abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick const float* p = data(); 935abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick int n = length(); 945abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 955abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick float max = 0.0f; 965abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick while (n--) 975abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick max = std::max(max, fabsf(*p++)); 985abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 995abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick return max; 1005abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} 1015abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 1025abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} // WebCore 1035abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 1045abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#endif // ENABLE(WEB_AUDIO) 105