Attachment 348882 Details for Bug 189284 – Patch

[patch] Patch

bug-189284-20180904182121.patch (text/plain), 60.92 KB, created by Eric Carlson on 2018-09-04 18:21:23 PDT

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Creator: Eric Carlson

Created: 2018-09-04 18:21:23 PDT

Size: 60.92 KB

patch

obsolete

>Subversion Revision: 235627
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 8a8b6c14ad9a41efb2cd33d4b9425eef24c3c5ab..07b7e19c1cdc52f1593b267a7c1bcdf8ae6eb390 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,94 @@
>+2018-09-04  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MediaStream] Simplify logic when changing RealtimeMediaSource settings
>+        https://bugs.webkit.org/show_bug.cgi?id=189284
>+        <rdar://problem/44117948>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Remove all "apply<setting>" methods from RealtimeMediaSource and derived classes, and
>+        add a bitfield to settingsDidChange so classes can do setting-specific setup and
>+        configuration by overriding settingsDidChange.
>+
>+        No new tests, no functionality changed.
>+
>+        * Modules/mediastream/CanvasCaptureMediaStreamTrack.cpp:
>+        (WebCore::CanvasCaptureMediaStreamTrack::Source::canvasResized):
>+        * Modules/mediastream/CanvasCaptureMediaStreamTrack.h:
>+        * platform/mediastream/MediaConstraints.h:
>+        (WebCore::NumericConstraint::fitnessDistance const):
>+        (WebCore::NumericConstraint::valueForDiscreteCapabilityValues const):
>+        * platform/mediastream/RealtimeIncomingVideoSource.h:
>+        (): Deleted.
>+        * platform/mediastream/RealtimeMediaSource.cpp:
>+        (WebCore::RealtimeMediaSource::RealtimeMediaSource):
>+        (WebCore::RealtimeMediaSource::settingsDidChange):
>+        (WebCore::RealtimeMediaSource::fitnessDistance):
>+        (WebCore::applyNumericConstraint):
>+        (WebCore::RealtimeMediaSource::applyConstraint):
>+        (WebCore::RealtimeMediaSource::applyConstraints):
>+        (WebCore::RealtimeMediaSource::setSize):
>+        (WebCore::RealtimeMediaSource::setWidth):
>+        (WebCore::RealtimeMediaSource::setHeight):
>+        (WebCore::RealtimeMediaSource::setFrameRate):
>+        (WebCore::RealtimeMediaSource::setAspectRatio):
>+        (WebCore::RealtimeMediaSource::setFacingMode):
>+        (WebCore::RealtimeMediaSource::setVolume):
>+        (WebCore::RealtimeMediaSource::setSampleRate):
>+        (WebCore::RealtimeMediaSource::setSampleSize):
>+        (WebCore::RealtimeMediaSource::setEchoCancellation):
>+        * platform/mediastream/RealtimeMediaSource.h:
>+        * platform/mediastream/RealtimeMediaSourceSettings.cpp:
>+        (WebCore::RealtimeMediaSourceSettings::diff const):
>+        * platform/mediastream/RealtimeMediaSourceSettings.h:
>+        (WebCore::RealtimeMediaSourceSettings::allFlags):
>+        * platform/mediastream/RealtimeVideoSource.cpp:
>+        (WebCore::RealtimeVideoSource::applySize): Deleted.
>+        (WebCore::RealtimeVideoSource::applyFrameRate): Deleted.
>+        * platform/mediastream/RealtimeVideoSource.h:
>+        * platform/mediastream/mac/AVVideoCaptureSource.h:
>+        * platform/mediastream/mac/AVVideoCaptureSource.mm:
>+        (WebCore::AVVideoCaptureSource::settingsDidChange):
>+        (WebCore::AVVideoCaptureSource::setPreset):
>+        (WebCore::AVVideoCaptureSource::setFrameRate):
>+        (WebCore::AVVideoCaptureSource::applySizeAndFrameRate):
>+        (WebCore::AVVideoCaptureSource::processNewFrame):
>+        (WebCore::AVVideoCaptureSource::applySize): Deleted.
>+        (WebCore::AVVideoCaptureSource::applyFrameRate): Deleted.
>+        * platform/mediastream/mac/CoreAudioCaptureSource.cpp:
>+        (WebCore::CoreAudioCaptureSource::settingsDidChange):
>+        (WebCore::CoreAudioCaptureSource::applySampleRate): Deleted.
>+        (WebCore::CoreAudioCaptureSource::applyEchoCancellation): Deleted.
>+        * platform/mediastream/mac/CoreAudioCaptureSource.h:
>+        * platform/mediastream/mac/DisplayCaptureSourceCocoa.cpp:
>+        (WebCore::DisplayCaptureSourceCocoa::settingsDidChange):
>+        (WebCore::DisplayCaptureSourceCocoa::startProducingData):
>+        (WebCore::DisplayCaptureSourceCocoa::applySize): Deleted.
>+        (WebCore::DisplayCaptureSourceCocoa::applyFrameRate): Deleted.
>+        * platform/mediastream/mac/DisplayCaptureSourceCocoa.h:
>+        * platform/mediastream/mac/MockRealtimeAudioSourceMac.h:
>+        * platform/mediastream/mac/MockRealtimeAudioSourceMac.mm:
>+        (WebCore::MockRealtimeAudioSourceMac::settingsDidChange):
>+        (WebCore::MockRealtimeAudioSourceMac::applySampleRate): Deleted.
>+        * platform/mediastream/mac/MockRealtimeVideoSourceMac.h:
>+        * platform/mediastream/mac/MockRealtimeVideoSourceMac.mm:
>+        (WebCore::MockRealtimeVideoSourceMac::settingsDidChange):
>+        (WebCore::MockRealtimeVideoSourceMac::applySize): Deleted.
>+        * platform/mediastream/mac/RealtimeIncomingVideoSourceCocoa.mm:
>+        (WebCore::RealtimeIncomingVideoSourceCocoa::processNewSample):
>+        * platform/mediastream/mac/ScreenDisplayCaptureSourceMac.h:
>+        * platform/mediastream/mac/ScreenDisplayCaptureSourceMac.mm:
>+        (WebCore::ScreenDisplayCaptureSourceMac::settingsDidChange):
>+        (WebCore::ScreenDisplayCaptureSourceMac::applySize): Deleted.
>+        (WebCore::ScreenDisplayCaptureSourceMac::applyFrameRate): Deleted.
>+        * platform/mock/MockRealtimeAudioSource.cpp:
>+        (WebCore::MockRealtimeAudioSource::settingsDidChange):
>+        * platform/mock/MockRealtimeAudioSource.h:
>+        * platform/mock/MockRealtimeVideoSource.cpp:
>+        (WebCore::MockRealtimeVideoSource::settingsDidChange):
>+        (WebCore::MockRealtimeVideoSource::applySize): Deleted.
>+        * platform/mock/MockRealtimeVideoSource.h:
>+
> 2018-09-03  Dean Jackson  <dino@apple.com>
> 
>         Move SystemPreview code from WebKitAdditions to WebKit
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index c6aee48d92462482e79070b96e5e9a81a26bba7f..9892af63d806c2a382e7ecbfab040e1eb8ef067c 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,14 @@
>+2018-09-04  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MediaStream] Simplify logic when changing RealtimeMediaSource settings
>+        https://bugs.webkit.org/show_bug.cgi?id=189284
>+        <rdar://problem/44117948>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebProcess/cocoa/UserMediaCaptureManager.cpp:
>+        (WebKit::UserMediaCaptureManager::Source::setSettings):
>+
> 2018-09-03  Dean Jackson  <dino@apple.com>
> 
>         Move SystemPreview code from WebKitAdditions to WebKit
>diff --git a/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.cpp b/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.cpp
>index 24b816d2f0f88635811d63c6c35b79edc7987b65..cdd04b903c7bf26cfe89d6879075b343d640e48f 100644
>--- a/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.cpp
>+++ b/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.cpp
>@@ -114,10 +114,16 @@ void CanvasCaptureMediaStreamTrack::Source::canvasResized(CanvasBase& canvas)
> {
>     ASSERT_UNUSED(canvas, m_canvas == &canvas);
> 
>+    OptionSet<RealtimeMediaSourceSettings::Flag> changed;
>+    if (m_canvas->width() != m_settings.width())
>+        changed.add(RealtimeMediaSourceSettings::Flag::Width);
>+    if (m_canvas->height() != m_settings.height())
>+        changed.add(RealtimeMediaSourceSettings::Flag::Height);
>+
>     m_settings.setWidth(m_canvas->width());
>     m_settings.setHeight(m_canvas->height());
> 
>-    settingsDidChange();
>+    settingsDidChange(changed);
> }
> 
> void CanvasCaptureMediaStreamTrack::Source::canvasChanged(CanvasBase& canvas, const FloatRect&)
>diff --git a/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.h b/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.h
>index 635b4b1c8a6c607ed2851cf20fc4a0f3e40c40ac..b006af93bf4d11253ff7c16d2376c0ae1c34c4ae 100644
>--- a/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.h
>+++ b/Source/WebCore/Modules/mediastream/CanvasCaptureMediaStreamTrack.h
>@@ -67,7 +67,6 @@ private:
>         void stopProducingData()  final;
>         const RealtimeMediaSourceCapabilities& capabilities() const final { return RealtimeMediaSourceCapabilities::emptyCapabilities(); }
>         const RealtimeMediaSourceSettings& settings() const final { return m_settings; }
>-        bool applySize(const IntSize&) final { return true; }
> 
>         void captureCanvas();
>         void requestFrameTimerFired();
>diff --git a/Source/WebCore/platform/mediastream/MediaConstraints.h b/Source/WebCore/platform/mediastream/MediaConstraints.h
>index 65e96aca9db172dd2728b3c5f159167df33c2b6e..30ec41a63b888d15c0345a9233308045d912a5fd 100644
>--- a/Source/WebCore/platform/mediastream/MediaConstraints.h
>+++ b/Source/WebCore/platform/mediastream/MediaConstraints.h
>@@ -193,6 +193,19 @@ public:
>         return static_cast<double>(std::abs(ideal - m_ideal.value())) / std::max(std::abs(ideal), std::abs(m_ideal.value()));
>     }
> 
>+    double fitnessDistance(const Vector<ValueType>& discreteCapabilityValues) const
>+    {
>+        double minDistance = std::numeric_limits<double>::infinity();
>+
>+        for (auto& value : discreteCapabilityValues) {
>+            auto distance = fitnessDistance(value, value);
>+            if (distance < minDistance)
>+                minDistance = distance;
>+        }
>+
>+        return minDistance;
>+    }
>+
>     bool validForRange(ValueType rangeMin, ValueType rangeMax) const
>     {
>         if (isEmpty())
>@@ -277,6 +290,46 @@ public:
>         return value;
>     }
> 
>+    ValueType valueForDiscreteCapabilityValues(ValueType current, const Vector<ValueType>& discreteCapabilityValues) const
>+    {
>+        ValueType value { 0 };
>+        std::optional<ValueType> min;
>+        std::optional<ValueType> max;
>+
>+        if (m_exact) {
>+            ASSERT(discreteCapabilityValues.contains(m_exact.value()));
>+            return m_exact.value();
>+        }
>+
>+        if (m_min) {
>+            auto index = discreteCapabilityValues.findMatching([&](ValueType value) { return m_min.value() >= value; });
>+            if (index != notFound) {
>+                min = value = discreteCapabilityValues[index];
>+
>+                // If there is no ideal, don't change if minimum is smaller than current.
>+                if (!m_ideal && value < current)
>+                    value = current;
>+            }
>+        }
>+
>+        if (m_max && m_max.value() >= discreteCapabilityValues[0]) {
>+            for (auto& discreteValue : discreteCapabilityValues) {
>+                if (m_max.value() <= discreteValue)
>+                    max = value = discreteValue;
>+            }
>+        }
>+
>+        if (m_ideal && discreteCapabilityValues.contains(m_ideal.value())) {
>+            value = m_ideal.value();
>+            if (max)
>+                value = std::min(max.value(), value);
>+            if (min)
>+                value = std::max(min.value(), value);
>+        }
>+
>+        return value;
>+    }
>+
>     bool isEmpty() const { return !m_min && !m_max && !m_exact && !m_ideal; }
>     bool isMandatory() const { return m_min || m_max || m_exact; }
> 
>diff --git a/Source/WebCore/platform/mediastream/RealtimeIncomingVideoSource.h b/Source/WebCore/platform/mediastream/RealtimeIncomingVideoSource.h
>index 7247bb833857e48e99ee786e75e4a93bb005d5ed..1b0bf94df5d4c93def8024efa91a5e165bf5d96d 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeIncomingVideoSource.h
>+++ b/Source/WebCore/platform/mediastream/RealtimeIncomingVideoSource.h
>@@ -71,8 +71,6 @@ private:
>     const RealtimeMediaSourceCapabilities& capabilities() const final;
>     const RealtimeMediaSourceSettings& settings() const final;
> 
>-    bool applySize(const IntSize&) final { return true; }
>-
>     rtc::scoped_refptr<webrtc::VideoTrackInterface> m_videoTrack;
> };
> 
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp b/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp
>index 2e9d965a199b5b321ad3fe30e18188f22e2b41df..49e99e4f2ace2297ffc7b3fdf68b526c842bd6fb 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2012 Google Inc. All rights reserved.
>- * Copyright (C) 2013-2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2013-2018 Apple Inc. All rights reserved.
>  * Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
>  * Copyright (C) 2015 Ericsson AB. All rights reserved.
>  *
>@@ -52,8 +52,6 @@ RealtimeMediaSource::RealtimeMediaSource(const String& id, Type type, const Stri
>     , m_type(type)
>     , m_name(name)
> {
>-    // FIXME(147205): Need to implement fitness score for constraints
>-
>     if (m_id.isEmpty())
>         m_id = createCanonicalUUIDString();
>     m_persistentID = m_id;
>@@ -133,13 +131,12 @@ void RealtimeMediaSource::notifyMutedObservers() const
>     });
> }
> 
>-void RealtimeMediaSource::settingsDidChange()
>+void RealtimeMediaSource::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>)
> {
>     ASSERT(isMainThread());
> 
>     if (m_pendingSettingsDidChangeNotification)
>         return;
>-
>     m_pendingSettingsDidChangeNotification = true;
> 
>     scheduleDeferredTask([this] {
>@@ -356,6 +353,9 @@ double RealtimeMediaSource::fitnessDistance(const MediaConstraint& constraint)
>         if (!capabilities.supportsSampleRate())
>             return 0;
> 
>+        if (auto discreteRates = discreteSampleRates())
>+            return downcast<IntConstraint>(constraint).fitnessDistance(*discreteRates);
>+
>         auto range = capabilities.sampleRate();
>         return downcast<IntConstraint>(constraint).fitnessDistance(range.rangeMin().asInt, range.rangeMax().asInt);
>         break;
>@@ -366,6 +366,9 @@ double RealtimeMediaSource::fitnessDistance(const MediaConstraint& constraint)
>         if (!capabilities.supportsSampleSize())
>             return 0;
> 
>+        if (auto discreteSizes = discreteSampleSizes())
>+            return downcast<IntConstraint>(constraint).fitnessDistance(*discreteSizes);
>+
>         auto range = capabilities.sampleSize();
>         return downcast<IntConstraint>(constraint).fitnessDistance(range.rangeMin().asInt, range.rangeMax().asInt);
>         break;
>@@ -421,8 +424,15 @@ double RealtimeMediaSource::fitnessDistance(const MediaConstraint& constraint)
> }
> 
> template <typename ValueType>
>-static void applyNumericConstraint(const NumericConstraint<ValueType>& constraint, ValueType current, ValueType capabilityMin, ValueType capabilityMax, RealtimeMediaSource* source, void (RealtimeMediaSource::*applier)(ValueType))
>+static void applyNumericConstraint(const NumericConstraint<ValueType>& constraint, ValueType current, std::optional<Vector<ValueType>> discreteCapabilityValues, ValueType capabilityMin, ValueType capabilityMax, RealtimeMediaSource* source, void (RealtimeMediaSource::*applier)(ValueType))
> {
>+    if (discreteCapabilityValues) {
>+        int value = constraint.valueForDiscreteCapabilityValues(current, *discreteCapabilityValues);
>+        if (value != current)
>+            (source->*applier)(value);
>+        return;
>+    }
>+
>     ValueType value = constraint.valueForCapabilityRange(current, capabilityMin, capabilityMax);
>     if (value != current)
>         (source->*applier)(value);
>@@ -442,35 +452,17 @@ void RealtimeMediaSource::applyConstraint(const MediaConstraint& constraint)
> {
>     auto& capabilities = this->capabilities();
>     switch (constraint.constraintType()) {
>-    case MediaConstraintType::Width: {
>-        ASSERT(constraint.isInt());
>-        if (!capabilities.supportsWidth())
>-            return;
>-
>-        auto range = capabilities.width();
>-        applyNumericConstraint(downcast<IntConstraint>(constraint), size().width(), range.rangeMin().asInt, range.rangeMax().asInt, this, &RealtimeMediaSource::setWidth);
>+    case MediaConstraintType::Width:
>+        ASSERT_NOT_REACHED();
>         break;
>-    }
>-
>-    case MediaConstraintType::Height: {
>-        ASSERT(constraint.isInt());
>-        if (!capabilities.supportsHeight())
>-            return;
> 
>-        auto range = capabilities.height();
>-        applyNumericConstraint(downcast<IntConstraint>(constraint), size().height(), range.rangeMin().asInt, range.rangeMax().asInt, this, &RealtimeMediaSource::setHeight);
>+    case MediaConstraintType::Height:
>+        ASSERT_NOT_REACHED();
>         break;
>-    }
>-
>-    case MediaConstraintType::FrameRate: {
>-        ASSERT(constraint.isDouble());
>-        if (!capabilities.supportsFrameRate())
>-            return;
> 
>-        auto range = capabilities.frameRate();
>-        applyNumericConstraint(downcast<DoubleConstraint>(constraint), frameRate(), range.rangeMin().asDouble, range.rangeMax().asDouble, this, &RealtimeMediaSource::setFrameRate);
>+    case MediaConstraintType::FrameRate:
>+        ASSERT_NOT_REACHED();
>         break;
>-    }
> 
>     case MediaConstraintType::AspectRatio: {
>         ASSERT(constraint.isDouble());
>@@ -478,7 +470,7 @@ void RealtimeMediaSource::applyConstraint(const MediaConstraint& constraint)
>             return;
> 
>         auto range = capabilities.aspectRatio();
>-        applyNumericConstraint(downcast<DoubleConstraint>(constraint), aspectRatio(), range.rangeMin().asDouble, range.rangeMax().asDouble, this, &RealtimeMediaSource::setAspectRatio);
>+        applyNumericConstraint(downcast<DoubleConstraint>(constraint), aspectRatio(), { }, range.rangeMin().asDouble, range.rangeMax().asDouble, this, &RealtimeMediaSource::setAspectRatio);
>         break;
>     }
> 
>@@ -488,7 +480,7 @@ void RealtimeMediaSource::applyConstraint(const MediaConstraint& constraint)
>             return;
> 
>         auto range = capabilities.volume();
>-        applyNumericConstraint(downcast<DoubleConstraint>(constraint), volume(), range.rangeMin().asDouble, range.rangeMax().asDouble, this, &RealtimeMediaSource::setVolume);
>+        applyNumericConstraint(downcast<DoubleConstraint>(constraint), volume(), { }, range.rangeMin().asDouble, range.rangeMax().asDouble, this, &RealtimeMediaSource::setVolume);
>         break;
>     }
> 
>@@ -498,7 +490,7 @@ void RealtimeMediaSource::applyConstraint(const MediaConstraint& constraint)
>             return;
> 
>         auto range = capabilities.sampleRate();
>-        applyNumericConstraint(downcast<IntConstraint>(constraint), sampleRate(), range.rangeMin().asInt, range.rangeMax().asInt, this, &RealtimeMediaSource::setSampleRate);
>+        applyNumericConstraint(downcast<IntConstraint>(constraint), sampleRate(), discreteSampleRates(), range.rangeMin().asInt, range.rangeMax().asInt, this, &RealtimeMediaSource::setSampleRate);
>         break;
>     }
> 
>@@ -508,7 +500,7 @@ void RealtimeMediaSource::applyConstraint(const MediaConstraint& constraint)
>             return;
> 
>         auto range = capabilities.sampleSize();
>-        applyNumericConstraint(downcast<IntConstraint>(constraint), sampleSize(), range.rangeMin().asInt, range.rangeMax().asInt, this, &RealtimeMediaSource::setSampleSize);
>+        applyNumericConstraint(downcast<IntConstraint>(constraint), sampleSize(), { }, range.rangeMin().asInt, range.rangeMax().asInt, this, &RealtimeMediaSource::setSampleSize);
>         break;
>     }
> 
>@@ -823,8 +815,6 @@ void RealtimeMediaSource::applyConstraints(const FlattenedConstraint& constraint
>         }
>     }
> 
>-    // FIXME: applySizeAndFrameRate should take MediaConstraint* instead of std::optional<> so it can see if a constraint is an exact, min, max,
>-    // or ideal, and choose the correct value for properties with non-discreet capabilities when necessary.
>     if (width || height || frameRate)
>         applySizeAndFrameRate(WTFMove(width), WTFMove(height), WTFMove(frameRate));
> 
>@@ -865,11 +855,14 @@ void RealtimeMediaSource::setSize(const IntSize& size)
>     if (size == m_size)
>         return;
> 
>-    if (!applySize(size))
>-        return;
>+    OptionSet<RealtimeMediaSourceSettings::Flag> changed;
>+    if (m_size.width() != size.width())
>+        changed.add(RealtimeMediaSourceSettings::Flag::Width);
>+    if (m_size.height() != size.height())
>+        changed.add(RealtimeMediaSourceSettings::Flag::Height);
> 
>     m_size = size;
>-    settingsDidChange();
>+    settingsDidChange(changed);
> }
> 
> void RealtimeMediaSource::setWidth(int width)
>@@ -877,15 +870,11 @@ void RealtimeMediaSource::setWidth(int width)
>     if (width == m_size.width())
>         return;
> 
>-    int height = m_aspectRatio ? width / m_aspectRatio : m_size.height();
>-    if (!applySize(IntSize(width, height)))
>-        return;
>-
>     m_size.setWidth(width);
>     if (m_aspectRatio)
>         m_size.setHeight(width / m_aspectRatio);
> 
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::Width);
> }
> 
> void RealtimeMediaSource::setHeight(int height)
>@@ -893,79 +882,85 @@ void RealtimeMediaSource::setHeight(int height)
>     if (height == m_size.height())
>         return;
> 
>-    int width = m_aspectRatio ? height * m_aspectRatio : m_size.width();
>-    if (!applySize(IntSize(width, height)))
>-        return;
>-
>     if (m_aspectRatio)
>-        m_size.setWidth(width);
>+        m_size.setWidth(height * m_aspectRatio);
>     m_size.setHeight(height);
> 
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::Height);
> }
> 
> void RealtimeMediaSource::setFrameRate(double rate)
> {
>-    if (m_frameRate == rate || !applyFrameRate(rate))
>+    if (m_frameRate == rate)
>         return;
> 
>     m_frameRate = rate;
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::FrameRate);
> }
> 
> void RealtimeMediaSource::setAspectRatio(double ratio)
> {
>-    if (m_aspectRatio == ratio || !applyAspectRatio(ratio))
>+    if (m_aspectRatio == ratio)
>         return;
> 
>     m_aspectRatio = ratio;
>     m_size.setHeight(m_size.width() / ratio);
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::AspectRatio);
> }
> 
> void RealtimeMediaSource::setFacingMode(RealtimeMediaSourceSettings::VideoFacingMode mode)
> {
>-    if (m_facingMode == mode || !applyFacingMode(mode))
>+    if (m_facingMode == mode)
>         return;
> 
>     m_facingMode = mode;
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::FacingMode);
> }
> 
> void RealtimeMediaSource::setVolume(double volume)
> {
>-    if (m_volume == volume || !applyVolume(volume))
>+    if (m_volume == volume)
>         return;
> 
>     m_volume = volume;
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::Volume);
> }
> 
> void RealtimeMediaSource::setSampleRate(int rate)
> {
>-    if (m_sampleRate == rate || !applySampleRate(rate))
>+    if (m_sampleRate == rate)
>         return;
> 
>     m_sampleRate = rate;
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::SampleRate);
>+}
>+
>+std::optional<Vector<int>> RealtimeMediaSource::discreteSampleRates() const
>+{
>+    return std::nullopt;
> }
> 
> void RealtimeMediaSource::setSampleSize(int size)
> {
>-    if (m_sampleSize == size || !applySampleSize(size))
>+    if (m_sampleSize == size)
>         return;
> 
>     m_sampleSize = size;
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::SampleSize);
>+}
>+
>+std::optional<Vector<int>> RealtimeMediaSource::discreteSampleSizes() const
>+{
>+    return std::nullopt;
> }
> 
> void RealtimeMediaSource::setEchoCancellation(bool echoCancellation)
> {
>-    if (m_echoCancellation == echoCancellation || !applyEchoCancellation(echoCancellation))
>+    if (m_echoCancellation == echoCancellation)
>         return;
> 
>     m_echoCancellation = echoCancellation;
>-    settingsDidChange();
>+    settingsDidChange(RealtimeMediaSourceSettings::Flag::EchoCancellation);
> }
> 
> void RealtimeMediaSource::scheduleDeferredTask(WTF::Function<void()>&& function)
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSource.h b/Source/WebCore/platform/mediastream/RealtimeMediaSource.h
>index 48419bad0189f72469c26ccc6540843a700a2fe3..e08e656e3e71e106d69dff907f76826b6a743d2c 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSource.h
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSource.h
>@@ -1,7 +1,7 @@
> /*
>  * Copyright (C) 2011 Ericsson AB. All rights reserved.
>  * Copyright (C) 2012 Google Inc. All rights reserved.
>- * Copyright (C) 2013-2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2013-2018 Apple Inc. All rights reserved.
>  * Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
>  *
>  * Redistribution and use in source and binary forms, with or without
>@@ -169,35 +169,29 @@ public:
>     void setHeight(int);
>     void setSize(const IntSize&);
>     const IntSize& size() const { return m_size; }
>-    virtual bool applySize(const IntSize&) { return false; }
> 
>     double frameRate() const { return m_frameRate; }
>     void setFrameRate(double);
>-    virtual bool applyFrameRate(double) { return false; }
> 
>     double aspectRatio() const { return m_aspectRatio; }
>     void setAspectRatio(double);
>-    virtual bool applyAspectRatio(double) { return false; }
> 
>     RealtimeMediaSourceSettings::VideoFacingMode facingMode() const { return m_facingMode; }
>     void setFacingMode(RealtimeMediaSourceSettings::VideoFacingMode);
>-    virtual bool applyFacingMode(RealtimeMediaSourceSettings::VideoFacingMode) { return false; }
> 
>     double volume() const { return m_volume; }
>     void setVolume(double);
>-    virtual bool applyVolume(double) { return false; }
> 
>     int sampleRate() const { return m_sampleRate; }
>     void setSampleRate(int);
>-    virtual bool applySampleRate(int) { return false; }
>+    virtual std::optional<Vector<int>> discreteSampleRates() const;
> 
>     int sampleSize() const { return m_sampleSize; }
>     void setSampleSize(int);
>-    virtual bool applySampleSize(int) { return false; }
>+    virtual std::optional<Vector<int>> discreteSampleSizes() const;
> 
>     bool echoCancellation() const { return m_echoCancellation; }
>     void setEchoCancellation(bool);
>-    virtual bool applyEchoCancellation(bool) { return false; }
> 
>     virtual const RealtimeMediaSourceCapabilities& capabilities() const = 0;
>     virtual const RealtimeMediaSourceSettings& settings() const = 0;
>@@ -210,7 +204,7 @@ public:
>     bool supportsConstraints(const MediaConstraints&, String&);
>     bool supportsConstraint(const MediaConstraint&) const;
> 
>-    virtual void settingsDidChange();
>+    virtual void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>);
> 
>     virtual bool isIsolated() const { return false; }
> 
>@@ -274,8 +268,8 @@ private:
>     double m_fitnessScore { std::numeric_limits<double>::infinity() };
>     RealtimeMediaSourceSettings::VideoFacingMode m_facingMode { RealtimeMediaSourceSettings::User};
> 
>-    bool m_echoCancellation { false };
>     bool m_pendingSettingsDidChangeNotification { false };
>+    bool m_echoCancellation { false };
>     bool m_isProducingData { false };
>     bool m_interrupted { false };
>     bool m_captureDidFailed { false };
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.cpp b/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.cpp
>index 6a6dcfed5f7b5a6273289eeec3313e1fbf869824..bc304a94867ff5d08569c04acf458e38415c7eb4 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.cpp
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.cpp
>@@ -69,6 +69,43 @@ RealtimeMediaSourceSettings::VideoFacingMode RealtimeMediaSourceSettings::videoF
>     return RealtimeMediaSourceSettings::Unknown;
> }
> 
>+OptionSet<RealtimeMediaSourceSettings::Flag> RealtimeMediaSourceSettings::diff(const RealtimeMediaSourceSettings& that) const
>+{
>+    OptionSet<RealtimeMediaSourceSettings::Flag> diff;
>+
>+    if (width() != that.width())
>+        diff.add(RealtimeMediaSourceSettings::Width);
>+    if (height() != that.height())
>+        diff.add(RealtimeMediaSourceSettings::Height);
>+    if (aspectRatio() != that.aspectRatio())
>+        diff.add(RealtimeMediaSourceSettings::AspectRatio);
>+    if (frameRate() != that.frameRate())
>+        diff.add(RealtimeMediaSourceSettings::FrameRate);
>+    if (facingMode() != that.facingMode())
>+        diff.add(RealtimeMediaSourceSettings::FacingMode);
>+    if (volume() != that.volume())
>+        diff.add(RealtimeMediaSourceSettings::Volume);
>+    if (sampleRate() != that.sampleRate())
>+        diff.add(RealtimeMediaSourceSettings::SampleRate);
>+    if (sampleSize() != that.sampleSize())
>+        diff.add(RealtimeMediaSourceSettings::SampleSize);
>+    if (echoCancellation() != that.echoCancellation())
>+        diff.add(RealtimeMediaSourceSettings::EchoCancellation);
>+    if (deviceId() != that.deviceId())
>+        diff.add(RealtimeMediaSourceSettings::DeviceId);
>+    if (groupId() != that.groupId())
>+        diff.add(RealtimeMediaSourceSettings::GroupId);
>+    if (label() != that.label())
>+        diff.add(RealtimeMediaSourceSettings::Label);
>+    if (displaySurface() != that.displaySurface())
>+        diff.add(RealtimeMediaSourceSettings::DisplaySurface);
>+    if (logicalSurface() != that.logicalSurface())
>+        diff.add(RealtimeMediaSourceSettings::LogicalSurface);
>+
>+    return diff;
>+}
>+
>+
> } // namespace WebCore
> 
> #endif // ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.h b/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.h
>index 01c1523b820eb9460892130d96fdbbcad653db32..6b00dd41e0c66f5a9c7f6d05fa20d05fcf505e00 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.h
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSourceSettings.h
>@@ -30,6 +30,7 @@
> 
> #include "RealtimeMediaSourceSupportedConstraints.h"
> #include <wtf/EnumTraits.h>
>+#include <wtf/OptionSet.h>
> #include <wtf/RefCounted.h>
> #include <wtf/Vector.h>
> #include <wtf/text/AtomicString.h>
>@@ -43,6 +44,27 @@ public:
>     static String facingMode(RealtimeMediaSourceSettings::VideoFacingMode);
>     static RealtimeMediaSourceSettings::VideoFacingMode videoFacingModeEnum(const String&);
> 
>+    enum Flag {
>+        Width = 1 << 0,
>+        Height = 1 << 1,
>+        AspectRatio = 1 << 2,
>+        FrameRate = 1 << 3,
>+        FacingMode = 1 << 4,
>+        Volume = 1 << 5,
>+        SampleRate = 1 << 6,
>+        SampleSize = 1 << 7,
>+        EchoCancellation = 1 << 8,
>+        DeviceId = 1 << 9,
>+        GroupId = 1 << 10,
>+        Label = 1 << 11,
>+        DisplaySurface = 1 << 12,
>+        LogicalSurface = 1 << 13,
>+    };
>+
>+    static constexpr OptionSet<Flag> allFlags() { return { Width, Height, AspectRatio, FrameRate, FacingMode, Volume, SampleRate, SampleSize, EchoCancellation, DeviceId, GroupId, Label, DisplaySurface, LogicalSurface }; }
>+
>+    WEBCORE_EXPORT OptionSet<RealtimeMediaSourceSettings::Flag> diff(const RealtimeMediaSourceSettings&) const;
>+
>     explicit RealtimeMediaSourceSettings() = default;
> 
>     bool supportsWidth() const { return m_supportedConstraints.supportsWidth(); }
>diff --git a/Source/WebCore/platform/mediastream/RealtimeVideoSource.cpp b/Source/WebCore/platform/mediastream/RealtimeVideoSource.cpp
>index 2d1faead179d705f4198cc14e51bcd88b00f6d03..f3fc4ea551b8e7b2a0b302b084d2001c17b5ab53 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeVideoSource.cpp
>+++ b/Source/WebCore/platform/mediastream/RealtimeVideoSource.cpp
>@@ -125,17 +125,6 @@ IntSize RealtimeVideoSource::bestSupportedCaptureSizeForWidthAndHeight(std::opti
>     return { };
> }
> 
>-bool RealtimeVideoSource::applySize(const IntSize& size)
>-{
>-    IntSize supportedSize = bestSupportedCaptureSizeForWidthAndHeight(size.width(), size.height());
>-    if (supportedSize.isEmpty()) {
>-        LOG(Media, "RealtimeVideoSource::applySize(%p), unable find or set preset for width: %i, height: %i", this, size.width(), size.height());
>-        return false;
>-    }
>-
>-    return true;
>-}
>-
> void RealtimeVideoSource::applySizeAndFrameRate(std::optional<int> width, std::optional<int> height, std::optional<double> frameRate)
> {
>     if (width || height) {
>@@ -168,11 +157,6 @@ void RealtimeVideoSource::dispatchMediaSampleToObservers(MediaSample& sample)
>     videoSampleAvailable(sample);
> }
> 
>-bool RealtimeVideoSource::applyFrameRate(double rate)
>-{
>-    return supportsFrameRate(rate);
>-}
>-
> bool RealtimeVideoSource::supportsFrameRate(double frameRate)
> {
>     double epsilon = 0.001;
>diff --git a/Source/WebCore/platform/mediastream/RealtimeVideoSource.h b/Source/WebCore/platform/mediastream/RealtimeVideoSource.h
>index 1c257f6ddba675435550110c300c0189dcbe6510..6a2d4a11f32f0e675dad2024d959b3fb270a65c8 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeVideoSource.h
>+++ b/Source/WebCore/platform/mediastream/RealtimeVideoSource.h
>@@ -46,8 +46,6 @@ protected:
>     void prepareToProduceData();
>     bool supportsSizeAndFrameRate(std::optional<int> width, std::optional<int> height, std::optional<double>) final;
>     void applySizeAndFrameRate(std::optional<int> width, std::optional<int> height, std::optional<double>) final;
>-    bool applySize(const IntSize&) override;
>-    bool applyFrameRate(double) final;
> 
>     void setSupportedFrameRates(Vector<double>&&);
>     void setSupportedCaptureSizes(const Vector<IntSize>&& sizes) { m_supportedCaptureSizes = sizes; }
>diff --git a/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.h b/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.h
>index 748e4800c551f89527bca60eb9637c4495f4e768..913836098c6e1614106907b1f75f743bf148a1c4 100644
>--- a/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.h
>+++ b/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.h
>@@ -73,13 +73,12 @@ private:
> 
>     const RealtimeMediaSourceCapabilities& capabilities() const final;
>     void applySizeAndFrameRate(std::optional<int> width, std::optional<int> height, std::optional<double>) final;
>-    bool applySize(const IntSize&) final;
>-    bool applyFrameRate(double) final;
>+    bool setFrameRate(double);
>     const RealtimeMediaSourceSettings& settings() const final;
>     void startProducingData() final;
>     void stopProducingData() final;
>     bool supportsSizeAndFrameRate(std::optional<int> width, std::optional<int> height, std::optional<double>) final;
>-    void settingsDidChange() final;
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
>     void monitorOrientation(OrientationNotifier&) final;
>     void beginConfiguration() final;
>     void commitConfiguration() final;
>diff --git a/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.mm b/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.mm
>index 17e0556d9c67810293ee289d1e9f02a7ecca204f..91614125351ff85ff53769b7a6010409a126e4ae 100644
>--- a/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.mm
>+++ b/Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.mm
>@@ -270,10 +270,10 @@ void AVVideoCaptureSource::commitConfiguration()
>         [m_session commitConfiguration];
> }
> 
>-void AVVideoCaptureSource::settingsDidChange()
>+void AVVideoCaptureSource::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>     m_currentSettings = std::nullopt;
>-    RealtimeMediaSource::settingsDidChange();
>+    RealtimeMediaSource::settingsDidChange(settings);
> }
> 
> const RealtimeMediaSourceSettings& AVVideoCaptureSource::settings() const
>@@ -357,17 +357,6 @@ const RealtimeMediaSourceCapabilities& AVVideoCaptureSource::capabilities() cons
>     return *m_capabilities;
> }
> 
>-bool AVVideoCaptureSource::applySize(const IntSize& size)
>-{
>-    NSString *preset = bestSessionPresetForVideoDimensions(size.width(), size.height());
>-    if (!preset || ![session() canSetSessionPreset:preset]) {
>-        LOG(Media, "AVVideoCaptureSource::applySize(%p), unable find or set preset for width: %i, height: %i", this, size.width(), size.height());
>-        return false;
>-    }
>-
>-    return setPreset(preset);
>-}
>-
> IntSize AVVideoCaptureSource::sizeForPreset(NSString* preset)
> {
>     if (!preset)
>@@ -405,14 +394,14 @@ bool AVVideoCaptureSource::setPreset(NSString *preset)
>         [m_videoOutput setVideoSettings:settingsDictionary];
> #endif
>     } @catch(NSException *exception) {
>-        LOG(Media, "AVVideoCaptureSource::applySize(%p), exception thrown configuring device: <%s> %s", this, [[exception name] UTF8String], [[exception reason] UTF8String]);
>+        LOG(Media, "AVVideoCaptureSource::setPreset(%p), exception thrown configuring device: <%s> %s", this, [[exception name] UTF8String], [[exception reason] UTF8String]);
>         return false;
>     }
> 
>     return true;
> }
> 
>-bool AVVideoCaptureSource::applyFrameRate(double rate)
>+bool AVVideoCaptureSource::setFrameRate(double rate)
> {
>     using namespace PAL;
>     double epsilon = 0.00001;
>@@ -425,7 +414,7 @@ bool AVVideoCaptureSource::applyFrameRate(double rate)
>     }
> 
>     if (!bestFrameRateRange || !isFrameRateSupported(rate)) {
>-        LOG(Media, "AVVideoCaptureSource::applyFrameRate(%p), frame rate %f not supported by video device", this, rate);
>+        LOG(Media, "AVVideoCaptureSource::setFrameRate(%p), frame rate %f not supported by video device", this, rate);
>         return false;
>     }
> 
>@@ -442,16 +431,16 @@ bool AVVideoCaptureSource::applyFrameRate(double rate)
>             [device() unlockForConfiguration];
>         }
>     } @catch(NSException *exception) {
>-        LOG(Media, "AVVideoCaptureSource::applyFrameRate(%p), exception thrown configuring device: <%s> %s", this, [[exception name] UTF8String], [[exception reason] UTF8String]);
>+        LOG(Media, "AVVideoCaptureSource::setFrameRate(%p), exception thrown configuring device: <%s> %s", this, [[exception name] UTF8String], [[exception reason] UTF8String]);
>         return false;
>     }
> 
>     if (error) {
>-        LOG(Media, "AVVideoCaptureSource::applyFrameRate(%p), failed to lock video device for configuration: %s", this, [[error localizedDescription] UTF8String]);
>+        LOG(Media, "AVVideoCaptureSource::setFrameRate(%p), failed to lock video device for configuration: %s", this, [[error localizedDescription] UTF8String]);
>         return false;
>     }
> 
>-    LOG(Media, "AVVideoCaptureSource::applyFrameRate(%p) - set frame rate range to %f", this, rate);
>+    LOG(Media, "AVVideoCaptureSource::setFrameRate(%p) - set frame rate range to %f", this, rate);
>     return true;
> }
> 
>@@ -461,7 +450,7 @@ void AVVideoCaptureSource::applySizeAndFrameRate(std::optional<int> width, std::
>         setPreset(bestSessionPresetForVideoDimensions(WTFMove(width), WTFMove(height)));
> 
>     if (frameRate)
>-        applyFrameRate(frameRate.value());
>+        setFrameRate(frameRate.value());
> }
> 
> static inline int sensorOrientation(AVCaptureVideoOrientation videoOrientation)
>@@ -627,10 +616,15 @@ void AVVideoCaptureSource::processNewFrame(RetainPtr<CMSampleBufferRef> sampleBu
>         std::swap(dimensions.width, dimensions.height);
> 
>     if (dimensions.width != m_width || dimensions.height != m_height) {
>+        OptionSet<RealtimeMediaSourceSettings::Flag> changed;
>+        if (m_width != dimensions.width)
>+            changed.add(RealtimeMediaSourceSettings::Flag::Width);
>+        if (m_height != dimensions.height)
>+            changed.add(RealtimeMediaSourceSettings::Flag::Height);
>+
>         m_width = dimensions.width;
>         m_height = dimensions.height;
>-
>-        settingsDidChange();
>+        settingsDidChange(changed);
>     }
> 
>     videoSampleAvailable(MediaSampleAVFObjC::create(m_buffer.get(), m_sampleRotation, [connection isVideoMirrored]));
>diff --git a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.cpp b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.cpp
>index 6c74407e15fdb16181ffa557c31e621c12f22a02..7d727cca63b5fa8169c7015392cf34b57c5f55c8 100644
>--- a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.cpp
>+++ b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -876,39 +876,19 @@ const RealtimeMediaSourceSettings& CoreAudioCaptureSource::settings() const
>     return m_currentSettings.value();
> }
> 
>-void CoreAudioCaptureSource::settingsDidChange()
>+void CoreAudioCaptureSource::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>-    m_currentSettings = std::nullopt;
>-    RealtimeMediaSource::settingsDidChange();
>-}
>-
>-bool CoreAudioCaptureSource::applySampleRate(int sampleRate)
>-{
>-    // FIXME: We should be able to describe sample rate as a discreet range constraint so that we only enter here with values that can be applied.
>-    switch (sampleRate) {
>-    case 8000:
>-    case 16000:
>-    case 32000:
>-    case 44100:
>-    case 48000:
>-    case 96000:
>-        break;
>-    default:
>-        return false;
>+    if (settings.contains(RealtimeMediaSourceSettings::Flag::EchoCancellation)) {
>+        CoreAudioSharedUnit::singleton().setEnableEchoCancellation(echoCancellation());
>+        scheduleReconfiguration();
>+    }
>+    if (settings.contains(RealtimeMediaSourceSettings::Flag::SampleRate)) {
>+        CoreAudioSharedUnit::singleton().setSampleRate(sampleRate());
>+        scheduleReconfiguration();
>     }
> 
>-    CoreAudioSharedUnit::singleton().setSampleRate(sampleRate);
>-
>-    scheduleReconfiguration();
>-    return true;
>-}
>-
>-bool CoreAudioCaptureSource::applyEchoCancellation(bool enableEchoCancellation)
>-{
>-    CoreAudioSharedUnit::singleton().setEnableEchoCancellation(enableEchoCancellation);
>-
>-    scheduleReconfiguration();
>-    return true;
>+    m_currentSettings = std::nullopt;
>+    RealtimeMediaSource::settingsDidChange(settings);
> }
> 
> void CoreAudioCaptureSource::scheduleReconfiguration()
>diff --git a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h
>index 792eaf07e0cefb4785e0f76f252569f63661140e..c40d3c6c34d60cf4ba9ccedbf021d3d593d2ddba 100644
>--- a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h
>+++ b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -84,13 +84,11 @@ private:
>     void startProducingData() final;
>     void stopProducingData() final;
> 
>-    bool applyVolume(double) final { return true; }
>-    bool applySampleRate(int) final;
>-    bool applyEchoCancellation(bool) final;
>+    std::optional<Vector<int>> discreteSampleRates() const final { return { { 8000, 16000, 32000, 44100, 48000, 96000 } }; }
> 
>     const RealtimeMediaSourceCapabilities& capabilities() const final;
>     const RealtimeMediaSourceSettings& settings() const final;
>-    void settingsDidChange() final;
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
> 
>     bool interrupted() const final;
> 
>diff --git a/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.cpp b/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.cpp
>index e74cbee792efe5da942417d7f4e295c7ee852079..3ecd5ca2cded4175f5d47fa07e8c8990916a2341 100644
>--- a/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.cpp
>+++ b/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -98,10 +98,17 @@ const RealtimeMediaSourceSettings& DisplayCaptureSourceCocoa::settings() const
>     return m_currentSettings.value();
> }
> 
>-void DisplayCaptureSourceCocoa::settingsDidChange()
>+void DisplayCaptureSourceCocoa::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>+    if (settings.contains(RealtimeMediaSourceSettings::Flag::FrameRate) && m_timer.isActive())
>+        m_timer.startRepeating(1_s / frameRate());
>+
>+    if (settings.containsAny({ RealtimeMediaSourceSettings::Flag::Width, RealtimeMediaSourceSettings::Flag::Height }))
>+        m_bufferAttributes = nullptr;
>+
>     m_currentSettings = std::nullopt;
>-    RealtimeMediaSource::settingsDidChange();
>+
>+    RealtimeMediaSource::settingsDidChange(settings);
> }
> 
> void DisplayCaptureSourceCocoa::startProducingData()
>@@ -111,7 +118,7 @@ void DisplayCaptureSourceCocoa::startProducingData()
> #endif
> 
>     m_startTime = MonotonicTime::now();
>-    m_timer.startRepeating(1_ms * lround(1000 / frameRate()));
>+    m_timer.startRepeating(1_s / frameRate());
> }
> 
> void DisplayCaptureSourceCocoa::stopProducingData()
>@@ -129,23 +136,6 @@ Seconds DisplayCaptureSourceCocoa::elapsedTime()
>     return m_elapsedTime + (MonotonicTime::now() - m_startTime);
> }
> 
>-bool DisplayCaptureSourceCocoa::applySize(const IntSize& newSize)
>-{
>-    if (size() == newSize)
>-        return true;
>-
>-    m_bufferAttributes = nullptr;
>-    return true;
>-}
>-
>-bool DisplayCaptureSourceCocoa::applyFrameRate(double rate)
>-{
>-    if (m_timer.isActive())
>-        m_timer.startRepeating(1_ms * lround(1000 / rate));
>-
>-    return true;
>-}
>-
> void DisplayCaptureSourceCocoa::emitFrame()
> {
>     if (muted())
>diff --git a/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.h b/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.h
>index 7877e0bac490cb0df32de191ec85b59553ef2a17..484c1b0a7278396cde6e13e4a991e72e542e2959 100644
>--- a/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.h
>+++ b/Source/WebCore/platform/mediastream/mac/DisplayCaptureSourceCocoa.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -54,21 +54,20 @@ protected:
>     void stopProducingData() override;
> 
>     Seconds elapsedTime();
>-    bool applyFrameRate(double) override;
>-    bool applySize(const IntSize&) override;
> 
>     RetainPtr<CMSampleBufferRef> sampleBufferFromPixelBuffer(CVPixelBufferRef);
> #if HAVE(IOSURFACE)
>     RetainPtr<CVPixelBufferRef> pixelBufferFromIOSurface(IOSurfaceRef);
> #endif
> 
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) override;
>+
> private:
> 
>     bool isCaptureSource() const final { return true; }
> 
>     const RealtimeMediaSourceCapabilities& capabilities() const final;
>     const RealtimeMediaSourceSettings& settings() const final;
>-    void settingsDidChange() final;
> 
>     void emitFrame();
> 
>diff --git a/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.h b/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.h
>index 6d14b035110b3cec693ddf0719053daf8e33b40c..99d78eec7c702ecd16ecfda0b84d0c56b9d4f3bc 100644
>--- a/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.h
>+++ b/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -50,8 +50,8 @@ private:
>     friend class MockRealtimeAudioSource;
>     MockRealtimeAudioSourceMac(const String& deviceID, const String& name);
> 
>-    bool applySampleRate(int) final;
>-    bool applySampleSize(int) final { return false; }
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
>+    std::optional<Vector<int>> discreteSampleRates() const final { return { { 44100, 48000 } }; }
> 
>     void emitSampleBuffers(uint32_t);
>     void render(Seconds) final;
>diff --git a/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.mm b/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.mm
>index 5abb8f28b25d7a327287c169e325a859ce4663fb..0c8a4bde205c9b9b2ab2a888976bc9749c3371ac 100644
>--- a/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.mm
>+++ b/Source/WebCore/platform/mediastream/mac/MockRealtimeAudioSourceMac.mm
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -158,30 +158,27 @@ void MockRealtimeAudioSourceMac::render(Seconds delta)
>     }
> }
> 
>-bool MockRealtimeAudioSourceMac::applySampleRate(int sampleRate)
>+void MockRealtimeAudioSourceMac::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>-    if (sampleRate < 44100 || sampleRate > 48000)
>-        return false;
>+    if (settings.contains(RealtimeMediaSourceSettings::Flag::SampleRate)) {
>+        m_formatDescription = nullptr;
>+        m_audioBufferList = nullptr;
> 
>-    if (sampleRate == this->sampleRate())
>-        return true;
>+        auto rate = sampleRate();
>+        size_t sampleCount = 2 * rate;
> 
>-    m_formatDescription = nullptr;
>-    m_audioBufferList = nullptr;
>+        m_bipBopBuffer.grow(sampleCount);
>+        m_bipBopBuffer.fill(0);
> 
>-    size_t sampleCount = 2 * sampleRate;
>+        size_t bipBopSampleCount = ceil(BipBopDuration * rate);
>+        size_t bipStart = 0;
>+        size_t bopStart = rate;
> 
>-    m_bipBopBuffer.grow(sampleCount);
>-    m_bipBopBuffer.fill(0);
>-
>-    size_t bipBopSampleCount = ceil(BipBopDuration * sampleRate);
>-    size_t bipStart = 0;
>-    size_t bopStart = sampleRate;
>-
>-    addHum(BipBopVolume, BipFrequency, sampleRate, 0, m_bipBopBuffer.data() + bipStart, bipBopSampleCount);
>-    addHum(BipBopVolume, BopFrequency, sampleRate, 0, m_bipBopBuffer.data() + bopStart, bipBopSampleCount);
>+        addHum(BipBopVolume, BipFrequency, rate, 0, m_bipBopBuffer.data() + bipStart, bipBopSampleCount);
>+        addHum(BipBopVolume, BopFrequency, rate, 0, m_bipBopBuffer.data() + bopStart, bipBopSampleCount);
>+    }
> 
>-    return true;
>+    MockRealtimeAudioSource::settingsDidChange(settings);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.h b/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.h
>index f583671337df07aa64ca883cbff64e0baa27e9be..73129e1be7cb6dcc166fd556e00fd195ec44374e 100644
>--- a/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.h
>+++ b/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.h
>@@ -56,7 +56,7 @@ private:
> 
>     PlatformLayer* platformLayer() const;
>     void updateSampleBuffer() final;
>-    bool applySize(const IntSize&) final;
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
> 
>     void orientationChanged(int orientation) final;
>     void monitorOrientation(OrientationNotifier&) final;
>diff --git a/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.mm b/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.mm
>index 4ccee19126074cc080731380a2117230e93c20dd..17b35baa157d5f446bb90397cc336151092fe8dc 100644
>--- a/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.mm
>+++ b/Source/WebCore/platform/mediastream/mac/MockRealtimeVideoSourceMac.mm
>@@ -154,13 +154,11 @@ void MockRealtimeVideoSourceMac::updateSampleBuffer()
>     dispatchMediaSampleToObservers(MediaSampleAVFObjC::create(sampleBuffer.get(), m_deviceOrientation));
> }
> 
>-bool MockRealtimeVideoSourceMac::applySize(const IntSize& newSize)
>+void MockRealtimeVideoSourceMac::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>-    if (!MockRealtimeVideoSource::applySize(newSize))
>-        return false;
>-
>-    m_bufferPool = nullptr;
>-    return true;
>+    if (settings.containsAny({ RealtimeMediaSourceSettings::Flag::Width, RealtimeMediaSourceSettings::Flag::Height }))
>+        m_bufferPool = nullptr;
>+    MockRealtimeVideoSource::settingsDidChange(settings);
> }
> 
> void MockRealtimeVideoSourceMac::orientationChanged(int orientation)
>diff --git a/Source/WebCore/platform/mediastream/mac/RealtimeIncomingVideoSourceCocoa.mm b/Source/WebCore/platform/mediastream/mac/RealtimeIncomingVideoSourceCocoa.mm
>index 4b425f9ba62b0f3f093a906fd4b2ae49c2a43c3e..bbac8da5e439c8a20a28decf577decd6618e7a47 100644
>--- a/Source/WebCore/platform/mediastream/mac/RealtimeIncomingVideoSourceCocoa.mm
>+++ b/Source/WebCore/platform/mediastream/mac/RealtimeIncomingVideoSourceCocoa.mm
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -173,9 +173,15 @@ void RealtimeIncomingVideoSourceCocoa::processNewSample(CMSampleBufferRef sample
> {
>     m_buffer = sample;
>     if (width != m_currentSettings.width() || height != m_currentSettings.height()) {
>+        OptionSet<RealtimeMediaSourceSettings::Flag> changed;
>+        if (width != m_currentSettings.width())
>+            changed.add(RealtimeMediaSourceSettings::Flag::Width);
>+        if (height != m_currentSettings.height())
>+            changed.add(RealtimeMediaSourceSettings::Flag::Height);
>+
>         m_currentSettings.setWidth(width);
>         m_currentSettings.setHeight(height);
>-        settingsDidChange();
>+        settingsDidChange(changed);
>     }
> 
>     videoSampleAvailable(MediaSampleAVFObjC::create(sample, rotation));
>diff --git a/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.h b/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.h
>index d26a294e36e79e8a3a11950e2af1887c8127479f..0b1f3ef9f2f8d94a9a1eb886b8540e05976a38ac 100644
>--- a/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.h
>+++ b/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -59,8 +59,7 @@ private:
>     void generateFrame() final;
>     void startProducingData() final;
>     void stopProducingData() final;
>-    bool applySize(const IntSize&) final;
>-    bool applyFrameRate(double) final;
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
>     void commitConfiguration() final;
> 
>     bool createDisplayStream();
>diff --git a/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.mm b/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.mm
>index b17e7c2b45e0d90523a2c422c6e8cce7771bb2d8..e6e448c3ecaaf05083480930d5cdc40310e98a4d 100644
>--- a/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.mm
>+++ b/Source/WebCore/platform/mediastream/mac/ScreenDisplayCaptureSourceMac.mm
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -253,21 +253,12 @@ void ScreenDisplayCaptureSourceMac::startDisplayStream()
>     m_isRunning = true;
> }
> 
>-bool ScreenDisplayCaptureSourceMac::applySize(const IntSize& newSize)
>+void ScreenDisplayCaptureSourceMac::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>-    if (!DisplayCaptureSourceCocoa::applySize(newSize))
>-        return false;
>-
>-    m_displayStream = nullptr;
>-    return true;
>-}
>-
>-bool ScreenDisplayCaptureSourceMac::applyFrameRate(double rate)
>-{
>-    if (frameRate() != rate)
>+    if (settings.containsAny({ RealtimeMediaSourceSettings::Flag::Width, RealtimeMediaSourceSettings::Flag::Height, RealtimeMediaSourceSettings::Flag::FrameRate }))
>         m_displayStream = nullptr;
> 
>-    return DisplayCaptureSourceCocoa::applyFrameRate(rate);
>+    return DisplayCaptureSourceCocoa::settingsDidChange(settings);
> }
> 
> void ScreenDisplayCaptureSourceMac::commitConfiguration()
>diff --git a/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp b/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp
>index f3c937ff8a5bbd72f5f9839ad7d96ec24526725d..965727082cb323989596b81ac6a13a6d910f1095 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp
>+++ b/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp
>@@ -134,10 +134,10 @@ const RealtimeMediaSourceCapabilities& MockRealtimeAudioSource::capabilities() c
>     return m_capabilities.value();
> }
> 
>-void MockRealtimeAudioSource::settingsDidChange()
>+void MockRealtimeAudioSource::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>     m_currentSettings = std::nullopt;
>-    RealtimeMediaSource::settingsDidChange();
>+    RealtimeMediaSource::settingsDidChange(settings);
> }
> 
> void MockRealtimeAudioSource::startProducingData()
>diff --git a/Source/WebCore/platform/mock/MockRealtimeAudioSource.h b/Source/WebCore/platform/mock/MockRealtimeAudioSource.h
>index 443dd073f0b43bc562b4a7c1a039d32065156397..79c6678ad0153116c7ab7177449ba6895332b2a0 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeAudioSource.h
>+++ b/Source/WebCore/platform/mock/MockRealtimeAudioSource.h
>@@ -54,18 +54,13 @@ protected:
>     void stopProducingData() final;
> 
>     virtual void render(Seconds) { }
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) override;
> 
>     static Seconds renderInterval() { return 60_ms; }
> 
> private:
>-    bool applyVolume(double) override { return true; }
>-    bool applySampleRate(int) override { return true; }
>-    bool applySampleSize(int) override { return true; }
>-    bool applyEchoCancellation(bool) override { return true; }
>-
>     const RealtimeMediaSourceCapabilities& capabilities() const final;
>     const RealtimeMediaSourceSettings& settings() const final;
>-    void settingsDidChange() final;
> 
>     void tick();
> 
>diff --git a/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp b/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp
>index 1eec441d78ecad145d97d01f748ec082e1b26ea3..2aeaf2cafe173726e44de6377f11fea19bc5e7d3 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp
>+++ b/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp
>@@ -192,10 +192,17 @@ const RealtimeMediaSourceSettings& MockRealtimeVideoSource::settings() const
>     return m_currentSettings.value();
> }
> 
>-void MockRealtimeVideoSource::settingsDidChange()
>+void MockRealtimeVideoSource::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag> settings)
> {
>     m_currentSettings = std::nullopt;
>-    RealtimeVideoSource::settingsDidChange();
>+    if (settings.containsAny({ RealtimeMediaSourceSettings::Flag::Width, RealtimeMediaSourceSettings::Flag::Height })) {
>+        m_baseFontSize = size().height() * .08;
>+        m_bipBopFontSize = m_baseFontSize * 2.5;
>+        m_statsFontSize = m_baseFontSize * .5;
>+        m_imageBuffer = nullptr;
>+    }
>+
>+    RealtimeVideoSource::settingsDidChange(settings);
> }
> 
> void MockRealtimeVideoSource::startCaptureTimer()
>@@ -225,19 +232,6 @@ Seconds MockRealtimeVideoSource::elapsedTime()
>     return m_elapsedTime + (MonotonicTime::now() - m_startTime);
> }
> 
>-bool MockRealtimeVideoSource::applySize(const IntSize& size)
>-{
>-    if (!RealtimeVideoSource::applySize(size))
>-        return false;
>-
>-    m_baseFontSize = size.height() * .08;
>-    m_bipBopFontSize = m_baseFontSize * 2.5;
>-    m_statsFontSize = m_baseFontSize * .5;
>-    m_imageBuffer = nullptr;
>-
>-    return true;
>-}
>-
> void MockRealtimeVideoSource::drawAnimation(GraphicsContext& context)
> {
>     float radius = size().width() * .09;
>diff --git a/Source/WebCore/platform/mock/MockRealtimeVideoSource.h b/Source/WebCore/platform/mock/MockRealtimeVideoSource.h
>index 6ac7358e74c8e33a001b28e06f4525b73418c4f6..91f656afc1771db2f6fe6c6883f2e124007a9160 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeVideoSource.h
>+++ b/Source/WebCore/platform/mock/MockRealtimeVideoSource.h
>@@ -60,12 +60,11 @@ protected:
>     ImageBuffer* imageBuffer() const;
> 
>     Seconds elapsedTime();
>-    bool applySize(const IntSize&) override;
>+    void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) override;
> 
> private:
>     const RealtimeMediaSourceCapabilities& capabilities() const final;
>     const RealtimeMediaSourceSettings& settings() const final;
>-    void settingsDidChange() final;
> 
>     void startProducingData() final;
>     void stopProducingData() final;
>@@ -74,9 +73,6 @@ private:
>     void drawText(GraphicsContext&);
>     void drawBoxes(GraphicsContext&);
> 
>-    bool applyFacingMode(RealtimeMediaSourceSettings::VideoFacingMode) override { return true; }
>-    bool applyAspectRatio(double) override { return true; }
>-
>     bool isCaptureSource() const final { return true; }
> 
>     void generateFrame();
>diff --git a/Source/WebKit/WebProcess/cocoa/UserMediaCaptureManager.cpp b/Source/WebKit/WebProcess/cocoa/UserMediaCaptureManager.cpp
>index 8240d50a5280a44fc77ef3cdf0ce82ad7ae270c2..25cbfc3c16b4121eefc37197154f2ccd479bdc24 100644
>--- a/Source/WebKit/WebProcess/cocoa/UserMediaCaptureManager.cpp
>+++ b/Source/WebKit/WebProcess/cocoa/UserMediaCaptureManager.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -74,8 +74,9 @@ public:
>     const RealtimeMediaSourceSettings& settings() const final { return m_settings; }
>     void setSettings(RealtimeMediaSourceSettings&& settings)
>     {
>+        auto changed = m_settings.diff(settings);
>         m_settings = WTFMove(settings);
>-        settingsDidChange();
>+        settingsDidChange(changed);
>     }
> 
>     const CAAudioStreamDescription& description() const { return m_description; }

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Attachments on bug 189284: 348882 | 348885 | 348888 | 348921 | 348923