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-rw-r--r--WebCore/platform/audio/Reverb.cpp227
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diff --git a/WebCore/platform/audio/Reverb.cpp b/WebCore/platform/audio/Reverb.cpp
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-/*
- * 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 "Reverb.h"
-
-#include "AudioBus.h"
-#include "AudioFileReader.h"
-#include "ReverbConvolver.h"
-#include <math.h>
-#include <wtf/MathExtras.h>
-#include <wtf/OwnPtr.h>
-#include <wtf/PassOwnPtr.h>
-
-#if OS(DARWIN)
-using namespace std;
-#endif
-
-namespace WebCore {
-
-// Empirical gain calibration tested across many impulse responses to ensure perceived volume is same as dry (unprocessed) signal
-const double GainCalibration = -58.0;
-
-// A minimum power value to when normalizing a silent (or very quiet) impulse response
-const double MinPower = 0.000125;
-
-static double calculateNormalizationScale(AudioBus* response)
-{
- // Normalize by RMS power
- size_t numberOfChannels = response->numberOfChannels();
- size_t length = response->length();
-
- double power = 0.0;
-
- for (size_t i = 0; i < numberOfChannels; ++i) {
- int n = length;
- float* p = response->channel(i)->data();
-
- while (n--) {
- float sample = *p++;
- power += sample * sample;
- }
- }
-
- power = sqrt(power / (numberOfChannels * length));
-
- // Protect against accidental overload
- if (isinf(power) || isnan(power) || power < MinPower)
- power = MinPower;
-
- double scale = 1.0 / power;
-
- scale *= pow(10.0, GainCalibration * 0.05); // calibrate to make perceived volume same as unprocessed
-
- // True-stereo compensation
- if (response->numberOfChannels() == 4)
- scale *= 0.5;
-
- return scale;
-}
-
-Reverb::Reverb(AudioBus* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads)
-{
- double scale = calculateNormalizationScale(impulseResponse);
- if (scale)
- impulseResponse->scale(scale);
-
- initialize(impulseResponse, renderSliceSize, maxFFTSize, numberOfChannels, useBackgroundThreads);
-
- // Undo scaling since this shouldn't be a destructive operation on impulseResponse
- if (scale)
- impulseResponse->scale(1.0 / scale);
-}
-
-void Reverb::initialize(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads)
-{
- m_impulseResponseLength = impulseResponseBuffer->length();
-
- // The reverb can handle a mono impulse response and still do stereo processing
- size_t numResponseChannels = impulseResponseBuffer->numberOfChannels();
- m_convolvers.reserveCapacity(numberOfChannels);
-
- int convolverRenderPhase = 0;
- for (size_t i = 0; i < numResponseChannels; ++i) {
- AudioChannel* channel = impulseResponseBuffer->channel(i);
-
- OwnPtr<ReverbConvolver> convolver = adoptPtr(new ReverbConvolver(channel, renderSliceSize, maxFFTSize, convolverRenderPhase, useBackgroundThreads));
- m_convolvers.append(convolver.release());
-
- convolverRenderPhase += renderSliceSize;
- }
-
- // For "True" stereo processing we allocate a temporary buffer to avoid repeatedly allocating it in the process() method.
- // It can be bad to allocate memory in a real-time thread.
- if (numResponseChannels == 4)
- m_tempBuffer = new AudioBus(2, MaxFrameSize);
-}
-
-void Reverb::process(AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess)
-{
- // Do a fairly comprehensive sanity check.
- // If these conditions are satisfied, all of the source and destination pointers will be valid for the various matrixing cases.
- bool isSafeToProcess = sourceBus && destinationBus && sourceBus->numberOfChannels() > 0 && destinationBus->numberOfChannels() > 0
- && framesToProcess <= MaxFrameSize && framesToProcess <= sourceBus->length() && framesToProcess <= destinationBus->length();
-
- ASSERT(isSafeToProcess);
- if (!isSafeToProcess)
- return;
-
- // For now only handle mono or stereo output
- if (destinationBus->numberOfChannels() > 2) {
- destinationBus->zero();
- return;
- }
-
- AudioChannel* destinationChannelL = destinationBus->channel(0);
- AudioChannel* sourceChannelL = sourceBus->channel(0);
-
- // Handle input -> output matrixing...
- size_t numInputChannels = sourceBus->numberOfChannels();
- size_t numOutputChannels = destinationBus->numberOfChannels();
- size_t numReverbChannels = m_convolvers.size();
-
- if (numInputChannels == 2 && numReverbChannels == 2 && numOutputChannels == 2) {
- // 2 -> 2 -> 2
- AudioChannel* sourceChannelR = sourceBus->channel(1);
- AudioChannel* destinationChannelR = destinationBus->channel(1);
- m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess);
- m_convolvers[1]->process(sourceChannelR, destinationChannelR, framesToProcess);
- } else if (numInputChannels == 1 && numOutputChannels == 2 && numReverbChannels == 2) {
- // 1 -> 2 -> 2
- for (int i = 0; i < 2; ++i) {
- AudioChannel* destinationChannel = destinationBus->channel(i);
- m_convolvers[i]->process(sourceChannelL, destinationChannel, framesToProcess);
- }
- } else if (numInputChannels == 1 && numReverbChannels == 1 && numOutputChannels == 2) {
- // 1 -> 1 -> 2
- m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess);
-
- // simply copy L -> R
- AudioChannel* destinationChannelR = destinationBus->channel(1);
- bool isCopySafe = destinationChannelL->data() && destinationChannelR->data() && destinationChannelL->length() >= framesToProcess && destinationChannelR->length() >= framesToProcess;
- ASSERT(isCopySafe);
- if (!isCopySafe)
- return;
- memcpy(destinationChannelR->data(), destinationChannelL->data(), sizeof(float) * framesToProcess);
- } else if (numInputChannels == 1 && numReverbChannels == 1 && numOutputChannels == 1) {
- // 1 -> 1 -> 1
- m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess);
- } else if (numInputChannels == 2 && numReverbChannels == 4 && numOutputChannels == 2) {
- // 2 -> 4 -> 2 ("True" stereo)
- AudioChannel* sourceChannelR = sourceBus->channel(1);
- AudioChannel* destinationChannelR = destinationBus->channel(1);
-
- AudioChannel* tempChannelL = m_tempBuffer->channel(0);
- AudioChannel* tempChannelR = m_tempBuffer->channel(1);
-
- // Process left virtual source
- m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess);
- m_convolvers[1]->process(sourceChannelL, destinationChannelR, framesToProcess);
-
- // Process right virtual source
- m_convolvers[2]->process(sourceChannelR, tempChannelL, framesToProcess);
- m_convolvers[3]->process(sourceChannelR, tempChannelR, framesToProcess);
-
- destinationBus->sumFrom(*m_tempBuffer);
- } else if (numInputChannels == 1 && numReverbChannels == 4 && numOutputChannels == 2) {
- // 1 -> 4 -> 2 (Processing mono with "True" stereo impulse response)
- // This is an inefficient use of a four-channel impulse response, but we should handle the case.
- AudioChannel* destinationChannelR = destinationBus->channel(1);
-
- AudioChannel* tempChannelL = m_tempBuffer->channel(0);
- AudioChannel* tempChannelR = m_tempBuffer->channel(1);
-
- // Process left virtual source
- m_convolvers[0]->process(sourceChannelL, destinationChannelL, framesToProcess);
- m_convolvers[1]->process(sourceChannelL, destinationChannelR, framesToProcess);
-
- // Process right virtual source
- m_convolvers[2]->process(sourceChannelL, tempChannelL, framesToProcess);
- m_convolvers[3]->process(sourceChannelL, tempChannelR, framesToProcess);
-
- destinationBus->sumFrom(*m_tempBuffer);
- } else {
- // Handle gracefully any unexpected / unsupported matrixing
- // FIXME: add code for 5.1 support...
- destinationBus->zero();
- }
-}
-
-void Reverb::reset()
-{
- for (size_t i = 0; i < m_convolvers.size(); ++i)
- m_convolvers[i]->reset();
-}
-
-} // namespace WebCore
-
-#endif // ENABLE(WEB_AUDIO)
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