Add m-esr52 at 52.6.0

1 files changed, 491 insertions, 0 deletions

diff --git a/dom/media/webaudio/blink/DynamicsCompressorKernel.cpp b/dom/media/webaudio/blink/DynamicsCompressorKernel.cpp
new file mode 100644
index 000000000..e5b4aba2f
--- /dev/null
+++ b/dom/media/webaudio/blink/DynamicsCompressorKernel.cpp
@@ -0,0 +1,491 @@
+/*
+ * Copyright (C) 2011 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 "DynamicsCompressorKernel.h"
+
+#include "DenormalDisabler.h"
+#include <algorithm>
+#include <cmath>
+
+#include "mozilla/FloatingPoint.h"
+#include "WebAudioUtils.h"
+
+using namespace std;
+
+using namespace mozilla::dom; // for WebAudioUtils
+using mozilla::IsInfinite;
+using mozilla::IsNaN;
+using mozilla::MakeUnique;
+
+namespace WebCore {
+
+
+// Metering hits peaks instantly, but releases this fast (in seconds).
+const float meteringReleaseTimeConstant = 0.325f;
+
+const float uninitializedValue = -1;
+
+DynamicsCompressorKernel::DynamicsCompressorKernel(float sampleRate, unsigned numberOfChannels)
+    : m_sampleRate(sampleRate)
+    , m_lastPreDelayFrames(DefaultPreDelayFrames)
+    , m_preDelayReadIndex(0)
+    , m_preDelayWriteIndex(DefaultPreDelayFrames)
+    , m_ratio(uninitializedValue)
+    , m_slope(uninitializedValue)
+    , m_linearThreshold(uninitializedValue)
+    , m_dbThreshold(uninitializedValue)
+    , m_dbKnee(uninitializedValue)
+    , m_kneeThreshold(uninitializedValue)
+    , m_kneeThresholdDb(uninitializedValue)
+    , m_ykneeThresholdDb(uninitializedValue)
+    , m_K(uninitializedValue)
+{
+    setNumberOfChannels(numberOfChannels);
+
+    // Initializes most member variables
+    reset();
+
+    m_meteringReleaseK =
+        static_cast<float>(WebAudioUtils::DiscreteTimeConstantForSampleRate(meteringReleaseTimeConstant, sampleRate));
+}
+
+size_t DynamicsCompressorKernel::sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+    size_t amount = 0;
+    amount += m_preDelayBuffers.ShallowSizeOfExcludingThis(aMallocSizeOf);
+    for (size_t i = 0; i < m_preDelayBuffers.Length(); i++) {
+        amount += aMallocSizeOf(m_preDelayBuffers[i].get());
+    }
+
+    return amount;
+}
+
+void DynamicsCompressorKernel::setNumberOfChannels(unsigned numberOfChannels)
+{
+    if (m_preDelayBuffers.Length() == numberOfChannels)
+        return;
+
+    m_preDelayBuffers.Clear();
+    for (unsigned i = 0; i < numberOfChannels; ++i)
+      m_preDelayBuffers.AppendElement(MakeUnique<float[]>(MaxPreDelayFrames));
+}
+
+void DynamicsCompressorKernel::setPreDelayTime(float preDelayTime)
+{
+    // Re-configure look-ahead section pre-delay if delay time has changed.
+    unsigned preDelayFrames = preDelayTime * sampleRate();
+    if (preDelayFrames > MaxPreDelayFrames - 1)
+        preDelayFrames = MaxPreDelayFrames - 1;
+
+    if (m_lastPreDelayFrames != preDelayFrames) {
+        m_lastPreDelayFrames = preDelayFrames;
+        for (unsigned i = 0; i < m_preDelayBuffers.Length(); ++i)
+	  memset(m_preDelayBuffers[i].get(), 0, sizeof(float) * MaxPreDelayFrames);
+
+        m_preDelayReadIndex = 0;
+        m_preDelayWriteIndex = preDelayFrames;
+    }
+}
+
+// Exponential curve for the knee.
+// It is 1st derivative matched at m_linearThreshold and asymptotically approaches the value m_linearThreshold + 1 / k.
+float DynamicsCompressorKernel::kneeCurve(float x, float k)
+{
+    // Linear up to threshold.
+    if (x < m_linearThreshold)
+        return x;
+
+    return m_linearThreshold + (1 - expf(-k * (x - m_linearThreshold))) / k;
+}
+
+// Full compression curve with constant ratio after knee.
+float DynamicsCompressorKernel::saturate(float x, float k)
+{
+    float y;
+
+    if (x < m_kneeThreshold)
+        y = kneeCurve(x, k);
+    else {
+        // Constant ratio after knee.
+        float xDb = WebAudioUtils::ConvertLinearToDecibels(x, -1000.0f);
+        float yDb = m_ykneeThresholdDb + m_slope * (xDb - m_kneeThresholdDb);
+
+        y = WebAudioUtils::ConvertDecibelsToLinear(yDb);
+    }
+
+    return y;
+}
+
+// Approximate 1st derivative with input and output expressed in dB.
+// This slope is equal to the inverse of the compression "ratio".
+// In other words, a compression ratio of 20 would be a slope of 1/20.
+float DynamicsCompressorKernel::slopeAt(float x, float k)
+{
+    if (x < m_linearThreshold)
+        return 1;
+
+    float x2 = x * 1.001;
+
+    float xDb = WebAudioUtils::ConvertLinearToDecibels(x, -1000.0f);
+    float x2Db = WebAudioUtils::ConvertLinearToDecibels(x2, -1000.0f);
+
+    float yDb = WebAudioUtils::ConvertLinearToDecibels(kneeCurve(x, k), -1000.0f);
+    float y2Db = WebAudioUtils::ConvertLinearToDecibels(kneeCurve(x2, k), -1000.0f);
+
+    float m = (y2Db - yDb) / (x2Db - xDb);
+
+    return m;
+}
+
+float DynamicsCompressorKernel::kAtSlope(float desiredSlope)
+{
+    float xDb = m_dbThreshold + m_dbKnee;
+    float x = WebAudioUtils::ConvertDecibelsToLinear(xDb);
+
+    // Approximate k given initial values.
+    float minK = 0.1f;
+    float maxK = 10000;
+    float k = 5;
+
+    for (int i = 0; i < 15; ++i) {
+        // A high value for k will more quickly asymptotically approach a slope of 0.
+        float slope = slopeAt(x, k);
+
+        if (slope < desiredSlope) {
+            // k is too high.
+            maxK = k;
+        } else {
+            // k is too low.
+            minK = k;
+        }
+
+        // Re-calculate based on geometric mean.
+        k = sqrtf(minK * maxK);
+    }
+
+    return k;
+}
+
+float DynamicsCompressorKernel::updateStaticCurveParameters(float dbThreshold, float dbKnee, float ratio)
+{
+    if (dbThreshold != m_dbThreshold || dbKnee != m_dbKnee || ratio != m_ratio) {
+        // Threshold and knee.
+        m_dbThreshold = dbThreshold;
+        m_linearThreshold = WebAudioUtils::ConvertDecibelsToLinear(dbThreshold);
+        m_dbKnee = dbKnee;
+
+        // Compute knee parameters.
+        m_ratio = ratio;
+        m_slope = 1 / m_ratio;
+
+        float k = kAtSlope(1 / m_ratio);
+
+        m_kneeThresholdDb = dbThreshold + dbKnee;
+        m_kneeThreshold = WebAudioUtils::ConvertDecibelsToLinear(m_kneeThresholdDb);
+
+        m_ykneeThresholdDb = WebAudioUtils::ConvertLinearToDecibels(kneeCurve(m_kneeThreshold, k), -1000.0f);
+
+        m_K = k;
+    }
+    return m_K;
+}
+
+void DynamicsCompressorKernel::process(float* sourceChannels[],
+                                       float* destinationChannels[],
+                                       unsigned numberOfChannels,
+                                       unsigned framesToProcess,
+
+                                       float dbThreshold,
+                                       float dbKnee,
+                                       float ratio,
+                                       float attackTime,
+                                       float releaseTime,
+                                       float preDelayTime,
+                                       float dbPostGain,
+                                       float effectBlend, /* equal power crossfade */
+
+                                       float releaseZone1,
+                                       float releaseZone2,
+                                       float releaseZone3,
+                                       float releaseZone4
+                                       )
+{
+    MOZ_ASSERT(m_preDelayBuffers.Length() == numberOfChannels);
+
+    float sampleRate = this->sampleRate();
+
+    float dryMix = 1 - effectBlend;
+    float wetMix = effectBlend;
+
+    float k = updateStaticCurveParameters(dbThreshold, dbKnee, ratio);
+
+    // Makeup gain.
+    float fullRangeGain = saturate(1, k);
+    float fullRangeMakeupGain = 1 / fullRangeGain;
+
+    // Empirical/perceptual tuning.
+    fullRangeMakeupGain = powf(fullRangeMakeupGain, 0.6f);
+
+    float masterLinearGain = WebAudioUtils::ConvertDecibelsToLinear(dbPostGain) * fullRangeMakeupGain;
+
+    // Attack parameters.
+    attackTime = max(0.001f, attackTime);
+    float attackFrames = attackTime * sampleRate;
+
+    // Release parameters.
+    float releaseFrames = sampleRate * releaseTime;
+
+    // Detector release time.
+    float satReleaseTime = 0.0025f;
+    float satReleaseFrames = satReleaseTime * sampleRate;
+
+    // Create a smooth function which passes through four points.
+
+    // Polynomial of the form
+    // y = a + b*x + c*x^2 + d*x^3 + e*x^4;
+
+    float y1 = releaseFrames * releaseZone1;
+    float y2 = releaseFrames * releaseZone2;
+    float y3 = releaseFrames * releaseZone3;
+    float y4 = releaseFrames * releaseZone4;
+
+    // All of these coefficients were derived for 4th order polynomial curve fitting where the y values
+    // match the evenly spaced x values as follows: (y1 : x == 0, y2 : x == 1, y3 : x == 2, y4 : x == 3)
+    float kA = 0.9999999999999998f*y1 + 1.8432219684323923e-16f*y2 - 1.9373394351676423e-16f*y3 + 8.824516011816245e-18f*y4;
+    float kB = -1.5788320352845888f*y1 + 2.3305837032074286f*y2 - 0.9141194204840429f*y3 + 0.1623677525612032f*y4;
+    float kC = 0.5334142869106424f*y1 - 1.272736789213631f*y2 + 0.9258856042207512f*y3 - 0.18656310191776226f*y4;
+    float kD = 0.08783463138207234f*y1 - 0.1694162967925622f*y2 + 0.08588057951595272f*y3 - 0.00429891410546283f*y4;
+    float kE = -0.042416883008123074f*y1 + 0.1115693827987602f*y2 - 0.09764676325265872f*y3 + 0.028494263462021576f*y4;
+
+    // x ranges from 0 -> 3       0    1    2   3
+    //                           -15  -10  -5   0db
+
+    // y calculates adaptive release frames depending on the amount of compression.
+
+    setPreDelayTime(preDelayTime);
+
+    const int nDivisionFrames = 32;
+
+    const int nDivisions = framesToProcess / nDivisionFrames;
+
+    unsigned frameIndex = 0;
+    for (int i = 0; i < nDivisions; ++i) {
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+        // Calculate desired gain
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+        // Fix gremlins.
+        if (IsNaN(m_detectorAverage))
+            m_detectorAverage = 1;
+        if (IsInfinite(m_detectorAverage))
+            m_detectorAverage = 1;
+
+        float desiredGain = m_detectorAverage;
+
+        // Pre-warp so we get desiredGain after sin() warp below.
+        float scaledDesiredGain = asinf(desiredGain) / (0.5f * M_PI);
+
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+        // Deal with envelopes
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+        // envelopeRate is the rate we slew from current compressor level to the desired level.
+        // The exact rate depends on if we're attacking or releasing and by how much.
+        float envelopeRate;
+
+        bool isReleasing = scaledDesiredGain > m_compressorGain;
+
+        // compressionDiffDb is the difference between current compression level and the desired level.
+        float compressionDiffDb = WebAudioUtils::ConvertLinearToDecibels(m_compressorGain / scaledDesiredGain, -1000.0f);
+
+        if (isReleasing) {
+            // Release mode - compressionDiffDb should be negative dB
+            m_maxAttackCompressionDiffDb = -1;
+
+            // Fix gremlins.
+            if (IsNaN(compressionDiffDb))
+                compressionDiffDb = -1;
+            if (IsInfinite(compressionDiffDb))
+                compressionDiffDb = -1;
+
+            // Adaptive release - higher compression (lower compressionDiffDb)  releases faster.
+
+            // Contain within range: -12 -> 0 then scale to go from 0 -> 3
+            float x = compressionDiffDb;
+            x = max(-12.0f, x);
+            x = min(0.0f, x);
+            x = 0.25f * (x + 12);
+
+            // Compute adaptive release curve using 4th order polynomial.
+            // Normal values for the polynomial coefficients would create a monotonically increasing function.
+            float x2 = x * x;
+            float x3 = x2 * x;
+            float x4 = x2 * x2;
+            float releaseFrames = kA + kB * x + kC * x2 + kD * x3 + kE * x4;
+
+#define kSpacingDb 5
+            float dbPerFrame = kSpacingDb / releaseFrames;
+
+            envelopeRate = WebAudioUtils::ConvertDecibelsToLinear(dbPerFrame);
+        } else {
+            // Attack mode - compressionDiffDb should be positive dB
+
+            // Fix gremlins.
+            if (IsNaN(compressionDiffDb))
+                compressionDiffDb = 1;
+            if (IsInfinite(compressionDiffDb))
+                compressionDiffDb = 1;
+
+            // As long as we're still in attack mode, use a rate based off
+            // the largest compressionDiffDb we've encountered so far.
+            if (m_maxAttackCompressionDiffDb == -1 || m_maxAttackCompressionDiffDb < compressionDiffDb)
+                m_maxAttackCompressionDiffDb = compressionDiffDb;
+
+            float effAttenDiffDb = max(0.5f, m_maxAttackCompressionDiffDb);
+
+            float x = 0.25f / effAttenDiffDb;
+            envelopeRate = 1 - powf(x, 1 / attackFrames);
+        }
+
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+        // Inner loop - calculate shaped power average - apply compression.
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+        {
+            int preDelayReadIndex = m_preDelayReadIndex;
+            int preDelayWriteIndex = m_preDelayWriteIndex;
+            float detectorAverage = m_detectorAverage;
+            float compressorGain = m_compressorGain;
+
+            int loopFrames = nDivisionFrames;
+            while (loopFrames--) {
+                float compressorInput = 0;
+
+                // Predelay signal, computing compression amount from un-delayed version.
+                for (unsigned i = 0; i < numberOfChannels; ++i) {
+                    float* delayBuffer = m_preDelayBuffers[i].get();
+                    float undelayedSource = sourceChannels[i][frameIndex];
+                    delayBuffer[preDelayWriteIndex] = undelayedSource;
+
+                    float absUndelayedSource = undelayedSource > 0 ? undelayedSource : -undelayedSource;
+                    if (compressorInput < absUndelayedSource)
+                        compressorInput = absUndelayedSource;
+                }
+
+                // Calculate shaped power on undelayed input.
+
+                float scaledInput = compressorInput;
+                float absInput = scaledInput > 0 ? scaledInput : -scaledInput;
+
+                // Put through shaping curve.
+                // This is linear up to the threshold, then enters a "knee" portion followed by the "ratio" portion.
+                // The transition from the threshold to the knee is smooth (1st derivative matched).
+                // The transition from the knee to the ratio portion is smooth (1st derivative matched).
+                float shapedInput = saturate(absInput, k);
+
+                float attenuation = absInput <= 0.0001f ? 1 : shapedInput / absInput;
+
+                float attenuationDb = -WebAudioUtils::ConvertLinearToDecibels(attenuation, -1000.0f);
+                attenuationDb = max(2.0f, attenuationDb);
+
+                float dbPerFrame = attenuationDb / satReleaseFrames;
+
+                float satReleaseRate = WebAudioUtils::ConvertDecibelsToLinear(dbPerFrame) - 1;
+
+                bool isRelease = (attenuation > detectorAverage);
+                float rate = isRelease ? satReleaseRate : 1;
+
+                detectorAverage += (attenuation - detectorAverage) * rate;
+                detectorAverage = min(1.0f, detectorAverage);
+
+                // Fix gremlins.
+                if (IsNaN(detectorAverage))
+                    detectorAverage = 1;
+                if (IsInfinite(detectorAverage))
+                    detectorAverage = 1;
+
+                // Exponential approach to desired gain.
+                if (envelopeRate < 1) {
+                    // Attack - reduce gain to desired.
+                    compressorGain += (scaledDesiredGain - compressorGain) * envelopeRate;
+                } else {
+                    // Release - exponentially increase gain to 1.0
+                    compressorGain *= envelopeRate;
+                    compressorGain = min(1.0f, compressorGain);
+                }
+
+                // Warp pre-compression gain to smooth out sharp exponential transition points.
+                float postWarpCompressorGain = sinf(0.5f * M_PI * compressorGain);
+
+                // Calculate total gain using master gain and effect blend.
+                float totalGain = dryMix + wetMix * masterLinearGain * postWarpCompressorGain;
+
+                // Calculate metering.
+                float dbRealGain = 20 * log10(postWarpCompressorGain);
+                if (dbRealGain < m_meteringGain)
+                    m_meteringGain = dbRealGain;
+                else
+                    m_meteringGain += (dbRealGain - m_meteringGain) * m_meteringReleaseK;
+
+                // Apply final gain.
+                for (unsigned i = 0; i < numberOfChannels; ++i) {
+                    float* delayBuffer = m_preDelayBuffers[i].get();
+                    destinationChannels[i][frameIndex] = delayBuffer[preDelayReadIndex] * totalGain;
+                }
+
+                frameIndex++;
+                preDelayReadIndex = (preDelayReadIndex + 1) & MaxPreDelayFramesMask;
+                preDelayWriteIndex = (preDelayWriteIndex + 1) & MaxPreDelayFramesMask;
+            }
+
+            // Locals back to member variables.
+            m_preDelayReadIndex = preDelayReadIndex;
+            m_preDelayWriteIndex = preDelayWriteIndex;
+            m_detectorAverage = DenormalDisabler::flushDenormalFloatToZero(detectorAverage);
+            m_compressorGain = DenormalDisabler::flushDenormalFloatToZero(compressorGain);
+        }
+    }
+}
+
+void DynamicsCompressorKernel::reset()
+{
+    m_detectorAverage = 0;
+    m_compressorGain = 1;
+    m_meteringGain = 1;
+
+    // Predelay section.
+    for (unsigned i = 0; i < m_preDelayBuffers.Length(); ++i)
+        memset(m_preDelayBuffers[i].get(), 0, sizeof(float) * MaxPreDelayFrames);
+
+    m_preDelayReadIndex = 0;
+    m_preDelayWriteIndex = DefaultPreDelayFrames;
+
+    m_maxAttackCompressionDiffDb = -1; // uninitialized state
+}
+
+} // namespace WebCore