From cad810f21b803229eb11403f9209855525a25d57 Mon Sep 17 00:00:00 2001
From: Steve Block <steveblock@google.com>
Date: Fri, 6 May 2011 11:45:16 +0100
Subject: Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
---
 WebCore/webaudio/DelayDSPKernel.cpp | 140 ------------------------------------
 1 file changed, 140 deletions(-)
 delete mode 100644 WebCore/webaudio/DelayDSPKernel.cpp

(limited to 'WebCore/webaudio/DelayDSPKernel.cpp')

diff --git a/WebCore/webaudio/DelayDSPKernel.cpp b/WebCore/webaudio/DelayDSPKernel.cpp
deleted file mode 100644
index 9cb0450..0000000
--- a/WebCore/webaudio/DelayDSPKernel.cpp
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 "DelayDSPKernel.h"
-
-#include "AudioUtilities.h"
-#include <algorithm>
-
-using namespace std;
-  
-const double DefaultMaxDelayTime = 1.0;
-const double SmoothingTimeConstant = 0.020; // 20ms
-  
-namespace WebCore {
-
-DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
-    : AudioDSPKernel(processor)
-    , m_maxDelayTime(DefaultMaxDelayTime)
-    , m_writeIndex(0)
-    , m_firstTime(true)
-{
-    ASSERT(processor && processor->sampleRate() > 0);
-    if (!processor)
-        return;
-
-    m_buffer.resize(static_cast<size_t>(processor->sampleRate() * DefaultMaxDelayTime));
-    m_buffer.zero();
-
-    m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, processor->sampleRate());
-}
-
-DelayDSPKernel::DelayDSPKernel(double maxDelayTime, double sampleRate)
-    : AudioDSPKernel(sampleRate)
-    , m_maxDelayTime(maxDelayTime)
-    , m_writeIndex(0)
-    , m_firstTime(true)
-{
-    ASSERT(maxDelayTime > 0.0);
-    if (maxDelayTime <= 0.0)
-        return;
-        
-    size_t bufferLength = static_cast<size_t>(sampleRate * maxDelayTime);
-    ASSERT(bufferLength);
-    if (!bufferLength)
-        return;
-    
-    m_buffer.resize(bufferLength);
-    m_buffer.zero();
-
-    m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, sampleRate);
-}
-
-void DelayDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
-{
-    size_t bufferLength = m_buffer.size();
-    float* buffer = m_buffer.data();
-
-    ASSERT(bufferLength);
-    if (!bufferLength)
-        return;
-        
-    ASSERT(source && destination);
-    if (!source || !destination)
-        return;
-        
-    double sampleRate = this->sampleRate();
-    double delayTime = delayProcessor() ? delayProcessor()->delayTime()->value() : m_desiredDelayFrames / sampleRate;
-
-    // Make sure the delay time is in a valid range.
-    delayTime = min(maxDelayTime(), delayTime);
-    delayTime = max(0.0, delayTime);
-
-    if (m_firstTime) {
-        m_currentDelayTime = delayTime;
-        m_firstTime = false;
-    }
-    
-    int n = framesToProcess;
-    while (n--) {
-        // Approach desired delay time.
-        m_currentDelayTime += (delayTime - m_currentDelayTime) * m_smoothingRate;
-
-        double desiredDelayFrames = m_currentDelayTime * sampleRate;
-
-        double readPosition = m_writeIndex + bufferLength - desiredDelayFrames;
-        if (readPosition > bufferLength)
-            readPosition -= bufferLength;
-
-        // Linearly interpolate in-between delay times.
-        int readIndex1 = static_cast<int>(readPosition);
-        int readIndex2 = (readIndex1 + 1) % bufferLength;
-        double interpolationFactor = readPosition - readIndex1;
-
-        double input = static_cast<float>(*source++);
-        buffer[m_writeIndex] = static_cast<float>(input);
-        m_writeIndex = (m_writeIndex + 1) % bufferLength;        
-        
-        double sample1 = buffer[readIndex1];
-        double sample2 = buffer[readIndex2];
-        
-        double output = (1.0 - interpolationFactor) * sample1 + interpolationFactor * sample2;
-
-        *destination++ = static_cast<float>(output);
-    }        
-}
-
-void DelayDSPKernel::reset()
-{
-    m_firstTime = true;
-    m_buffer.zero();
-}
-
-} // namespace WebCore
-
-#endif // ENABLE(WEB_AUDIO)
-- 
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