15ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen/* 25ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * Copyright (C) 2010 Google Inc. All rights reserved. 35ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * 45ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * Redistribution and use in source and binary forms, with or without 55ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * modification, are permitted provided that the following conditions 65ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * are met: 75ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * 85ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * 1. Redistributions of source code must retain the above copyright 95ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * notice, this list of conditions and the following disclaimer. 105ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * 2. Redistributions in binary form must reproduce the above copyright 115ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * notice, this list of conditions and the following disclaimer in the 125ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * documentation and/or other materials provided with the distribution. 135ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 145ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * its contributors may be used to endorse or promote products derived 155ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * from this software without specific prior written permission. 165ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * 175ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 185ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 195ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 205ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 215ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 225ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 235ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 245ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 255ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 265ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 275ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen */ 285ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 295ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include "config.h" 305ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 315ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#if ENABLE(WEB_AUDIO) 325ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 335ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include "Reverb.h" 345ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 355ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include "AudioBus.h" 365ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include "AudioFileReader.h" 375ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include "ReverbConvolver.h" 385ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include <math.h> 395ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include <wtf/MathExtras.h> 405ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include <wtf/OwnPtr.h> 415ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#include <wtf/PassOwnPtr.h> 425ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 435ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#if OS(DARWIN) 445ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenusing namespace std; 455ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#endif 465ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 475ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsennamespace WebCore { 485ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 495ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen// Empirical gain calibration tested across many impulse responses to ensure perceived volume is same as dry (unprocessed) signal 505ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenconst double GainCalibration = -58.0; 515ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 525ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen// A minimum power value to when normalizing a silent (or very quiet) impulse response 535ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenconst double MinPower = 0.000125; 545ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 555ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenstatic double calculateNormalizationScale(AudioBus* response) 565ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen{ 575ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Normalize by RMS power 585ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen size_t numberOfChannels = response->numberOfChannels(); 59e14391e94c850b8bd03680c23b38978db68687a8John Reck size_t length = response->length(); 605ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 615ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen double power = 0.0; 625ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 635ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen for (size_t i = 0; i < numberOfChannels; ++i) { 64e14391e94c850b8bd03680c23b38978db68687a8John Reck int n = length; 655ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen float* p = response->channel(i)->data(); 665ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 675ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen while (n--) { 685ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen float sample = *p++; 695ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen power += sample * sample; 705ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } 715ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } 725ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 73e14391e94c850b8bd03680c23b38978db68687a8John Reck power = sqrt(power / (numberOfChannels * length)); 745ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 755ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Protect against accidental overload 765ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (isinf(power) || isnan(power) || power < MinPower) 775ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen power = MinPower; 785ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 795ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen double scale = 1.0 / power; 805ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 815ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen scale *= pow(10.0, GainCalibration * 0.05); // calibrate to make perceived volume same as unprocessed 825ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 835ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // True-stereo compensation 845ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (response->numberOfChannels() == 4) 855ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen scale *= 0.5; 865ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 875ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen return scale; 885ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen} 895ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 905ddde30071f639962dd557c453f2ad01f8f0fd00Kristian MonsenReverb::Reverb(AudioBus* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads) 915ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen{ 925ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen double scale = calculateNormalizationScale(impulseResponse); 935ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (scale) 945ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen impulseResponse->scale(scale); 955ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 965ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen initialize(impulseResponse, renderSliceSize, maxFFTSize, numberOfChannels, useBackgroundThreads); 975ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 985ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Undo scaling since this shouldn't be a destructive operation on impulseResponse 995ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (scale) 1005ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen impulseResponse->scale(1.0 / scale); 1015ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen} 1025ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1035ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenvoid Reverb::initialize(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads) 1045ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen{ 105e14391e94c850b8bd03680c23b38978db68687a8John Reck m_impulseResponseLength = impulseResponseBuffer->length(); 1065ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1075ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // The reverb can handle a mono impulse response and still do stereo processing 1085ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen size_t numResponseChannels = impulseResponseBuffer->numberOfChannels(); 1095ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers.reserveCapacity(numberOfChannels); 1105ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1115ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen int convolverRenderPhase = 0; 1125ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen for (size_t i = 0; i < numResponseChannels; ++i) { 1135ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* channel = impulseResponseBuffer->channel(i); 1145ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 115e14391e94c850b8bd03680c23b38978db68687a8John Reck OwnPtr<ReverbConvolver> convolver = adoptPtr(new ReverbConvolver(channel, renderSliceSize, maxFFTSize, convolverRenderPhase, useBackgroundThreads)); 116e14391e94c850b8bd03680c23b38978db68687a8John Reck m_convolvers.append(convolver.release()); 1175ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1185ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen convolverRenderPhase += renderSliceSize; 1195ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } 1205ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1215ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // For "True" stereo processing we allocate a temporary buffer to avoid repeatedly allocating it in the process() method. 1225ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // It can be bad to allocate memory in a real-time thread. 1235ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (numResponseChannels == 4) 1245ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_tempBuffer = new AudioBus(2, MaxFrameSize); 1255ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen} 1265ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1275ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenvoid Reverb::process(AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess) 1285ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen{ 1295ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Do a fairly comprehensive sanity check. 1305ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // If these conditions are satisfied, all of the source and destination pointers will be valid for the various matrixing cases. 1315ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen bool isSafeToProcess = sourceBus && destinationBus && sourceBus->numberOfChannels() > 0 && destinationBus->numberOfChannels() > 0 132e14391e94c850b8bd03680c23b38978db68687a8John Reck && framesToProcess <= MaxFrameSize && framesToProcess <= sourceBus->length() && framesToProcess <= destinationBus->length(); 1335ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1345ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen ASSERT(isSafeToProcess); 1355ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (!isSafeToProcess) 1365ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen return; 1375ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1385ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // For now only handle mono or stereo output 1395ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (destinationBus->numberOfChannels() > 2) { 1405ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen destinationBus->zero(); 1415ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen return; 1425ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } 1435ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1445ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* destinationChannelL = destinationBus->channel(0); 1455ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* sourceChannelL = sourceBus->channel(0); 1465ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1475ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Handle input -> output matrixing... 1485ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen size_t numInputChannels = sourceBus->numberOfChannels(); 1495ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen size_t numOutputChannels = destinationBus->numberOfChannels(); 1505ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen size_t numReverbChannels = m_convolvers.size(); 1515ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1525ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (numInputChannels == 2 && numReverbChannels == 2 && numOutputChannels == 2) { 1535ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // 2 -> 2 -> 2 1545ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* sourceChannelR = sourceBus->channel(1); 1555ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* destinationChannelR = destinationBus->channel(1); 1565ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess); 1575ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[1]->process(sourceChannelR, destinationChannelR, framesToProcess); 1585ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } else if (numInputChannels == 1 && numOutputChannels == 2 && numReverbChannels == 2) { 1595ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // 1 -> 2 -> 2 1605ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen for (int i = 0; i < 2; ++i) { 1615ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* destinationChannel = destinationBus->channel(i); 1625ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[i]->process(sourceChannelL, destinationChannel, framesToProcess); 1635ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } 1645ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } else if (numInputChannels == 1 && numReverbChannels == 1 && numOutputChannels == 2) { 1655ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // 1 -> 1 -> 2 1665ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess); 1675ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1685ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // simply copy L -> R 1695ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* destinationChannelR = destinationBus->channel(1); 170e14391e94c850b8bd03680c23b38978db68687a8John Reck bool isCopySafe = destinationChannelL->data() && destinationChannelR->data() && destinationChannelL->length() >= framesToProcess && destinationChannelR->length() >= framesToProcess; 1715ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen ASSERT(isCopySafe); 1725ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen if (!isCopySafe) 1735ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen return; 1745ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen memcpy(destinationChannelR->data(), destinationChannelL->data(), sizeof(float) * framesToProcess); 1755ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } else if (numInputChannels == 1 && numReverbChannels == 1 && numOutputChannels == 1) { 1765ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // 1 -> 1 -> 1 1775ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess); 1785ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } else if (numInputChannels == 2 && numReverbChannels == 4 && numOutputChannels == 2) { 1795ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // 2 -> 4 -> 2 ("True" stereo) 1805ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* sourceChannelR = sourceBus->channel(1); 1815ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* destinationChannelR = destinationBus->channel(1); 1825ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1835ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* tempChannelL = m_tempBuffer->channel(0); 1845ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* tempChannelR = m_tempBuffer->channel(1); 1855ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1865ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Process left virtual source 1875ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess); 1885ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[1]->process(sourceChannelL, destinationChannelR, framesToProcess); 1895ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1905ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Process right virtual source 1915ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[2]->process(sourceChannelR, tempChannelL, framesToProcess); 1925ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[3]->process(sourceChannelR, tempChannelR, framesToProcess); 1935ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 1945ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen destinationBus->sumFrom(*m_tempBuffer); 1955ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } else if (numInputChannels == 1 && numReverbChannels == 4 && numOutputChannels == 2) { 1965ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // 1 -> 4 -> 2 (Processing mono with "True" stereo impulse response) 1975ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // This is an inefficient use of a four-channel impulse response, but we should handle the case. 1985ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* destinationChannelR = destinationBus->channel(1); 1995ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2005ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* tempChannelL = m_tempBuffer->channel(0); 2015ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen AudioChannel* tempChannelR = m_tempBuffer->channel(1); 2025ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2035ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Process left virtual source 2045ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess); 2055ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[1]->process(sourceChannelL, destinationChannelR, framesToProcess); 2065ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2075ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Process right virtual source 2085ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[2]->process(sourceChannelL, tempChannelL, framesToProcess); 2095ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[3]->process(sourceChannelL, tempChannelR, framesToProcess); 2105ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2115ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen destinationBus->sumFrom(*m_tempBuffer); 2125ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } else { 2135ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // Handle gracefully any unexpected / unsupported matrixing 2145ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen // FIXME: add code for 5.1 support... 2155ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen destinationBus->zero(); 2165ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen } 2175ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen} 2185ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2195ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsenvoid Reverb::reset() 2205ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen{ 2215ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen for (size_t i = 0; i < m_convolvers.size(); ++i) 2225ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen m_convolvers[i]->reset(); 2235ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen} 2245ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2255ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen} // namespace WebCore 2265ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen 2275ddde30071f639962dd557c453f2ad01f8f0fd00Kristian Monsen#endif // ENABLE(WEB_AUDIO) 228