Attachment 361396 Details for Bug 194348 – Patch

[patch] Patch

bug-194348-20190207082712.patch (text/plain), 112.04 KB, created by Eric Carlson on 2019-02-07 08:27:13 PST

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Creator: Eric Carlson

Created: 2019-02-07 08:27:13 PST

Size: 112.04 KB

patch

obsolete

>Subversion Revision: 241049
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index 65684330426e758849b51e259223d37e3270e59e..c9b702ee7eac7cf6f6383333388eb4f092e3f072 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,21 @@
>+2019-02-06  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MSE] Convert debug-only logging to runtime logging
>+        https://bugs.webkit.org/show_bug.cgi?id=194348
>+        <rdar://problem/47566449>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * wtf/LoggerHelper.h:
>+        (WTF::LoggerHelper::childLogIdentifier const): Helper to generate a log identifier for an
>+        object that is associated with another logging object.
>+        * wtf/MediaTime.cpp:
>+        (WTF::MediaTime::toJSONObject const):
>+        (WTF::MediaTime::toJSONString const):
>+        (WTF::MediaTimeRange::toJSONString const):
>+        (WTF::toJSONStringInternal): Deleted.
>+        * wtf/MediaTime.h:
>+
> 2019-02-05  Keith Rollin  <krollin@apple.com>
> 
>         Enable the automatic checking and regenerations of .xcfilelists during builds
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 20840c60dafa706d51455081fc61894f90fcfc79..3c01f89b3b4d1adf6dac57e10146dfb24b446edd 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,185 @@
>+2019-02-06  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MSE] Convert debug-only logging to runtime logging
>+        https://bugs.webkit.org/show_bug.cgi?id=194348
>+        <rdar://problem/47566449>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        No new tests, this just changes existing logging.
>+
>+        * Modules/mediasource/MediaSource.cpp:
>+        (WebCore::convertEnumerationToString):
>+        (WebCore::MediaSource::MediaSource):
>+        (WebCore::MediaSource::~MediaSource):
>+        (WebCore::MediaSource::setPrivateAndOpen):
>+        (WebCore::MediaSource::addedToRegistry):
>+        (WebCore::MediaSource::removedFromRegistry):
>+        (WebCore::MediaSource::durationChanged):
>+        (WebCore::MediaSource::seekToTime):
>+        (WebCore::MediaSource::completeSeek):
>+        (WebCore::MediaSource::setLiveSeekableRange):
>+        (WebCore::MediaSource::clearLiveSeekableRange):
>+        (WebCore::MediaSource::setDuration):
>+        (WebCore::MediaSource::setDurationInternal):
>+        (WebCore::MediaSource::setReadyState):
>+        (WebCore::MediaSource::endOfStream):
>+        (WebCore::MediaSource::streamEndedWithError):
>+        (WebCore::MediaSource::addSourceBuffer):
>+        (WebCore::MediaSource::removeSourceBuffer):
>+        (WebCore::MediaSource::isTypeSupported):
>+        (WebCore::MediaSource::detachFromElement):
>+        (WebCore::MediaSource::attachToElement):
>+        (WebCore::MediaSource::openIfInEndedState):
>+        (WebCore::MediaSource::suspend):
>+        (WebCore::MediaSource::resume):
>+        (WebCore::MediaSource::stop):
>+        (WebCore::MediaSource::onReadyStateChange):
>+        (WebCore::MediaSource::scheduleEvent):
>+        (WebCore::MediaSource::logChannel const):
>+        (WebCore::MediaSourceInternal::toString): Deleted.
>+        * Modules/mediasource/MediaSource.h:
>+        (WTF::LogArgument<WebCore::MediaSource::EndOfStreamError>::toString):
>+        (WTF::LogArgument<WebCore::MediaSource::ReadyState>::toString):
>+        * Modules/mediasource/SourceBuffer.cpp:
>+        (WebCore::SourceBuffer::SourceBuffer):
>+        (WebCore::SourceBuffer::~SourceBuffer):
>+        (WebCore::SourceBuffer::remove):
>+        (WebCore::SourceBuffer::seekToTime):
>+        (WebCore::SourceBuffer::appendBufferInternal):
>+        (WebCore::SourceBuffer::sourceBufferPrivateAppendComplete):
>+        (WebCore::SourceBuffer::sourceBufferPrivateDidReceiveRenderingError):
>+        (WebCore::removeSamplesFromTrackBuffer):
>+        (WebCore::SourceBuffer::removeCodedFrames):
>+        (WebCore::SourceBuffer::evictCodedFrames):
>+        (WebCore::SourceBuffer::sourceBufferPrivateDidReceiveInitializationSegment):
>+        (WebCore::SourceBuffer::sourceBufferPrivateDidReceiveSample):
>+        (WebCore::SourceBuffer::sourceBufferPrivateReenqueSamples):
>+        (WebCore::SourceBuffer::sourceBufferPrivateDidBecomeReadyForMoreSamples):
>+        (WebCore::SourceBuffer::provideMediaData):
>+        (WebCore::SourceBuffer::trySignalAllSamplesInTrackEnqueued):
>+        (WebCore::SourceBuffer::monitorBufferingRate):
>+        (WebCore::SourceBuffer::logChannel const):
>+        * Modules/mediasource/SourceBuffer.h:
>+        * dom/Document.cpp:
>+        (WebCore::messageSourceForWTFLogChannel):
>+        (WebCore::Document::didLogMessage):
>+        * html/HTMLMediaElement.cpp:
>+        (WebCore::convertEnumerationToString):
>+        (WebCore::HTMLMediaElement::scheduleCheckPlaybackTargetCompatability):
>+        (WebCore::HTMLMediaElement::selectMediaResource):
>+        (WebCore::HTMLMediaElement::loadResource):
>+        (WebCore::HTMLMediaElement::updateActiveTextTrackCues):
>+        (WebCore::HTMLMediaElement::scheduleConfigureTextTracks):
>+        (WebCore::HTMLMediaElement::scheduleMediaEngineWasUpdated):
>+        (WebCore::HTMLMediaElement::scheduleUpdatePlayState):
>+        (WebCore::HTMLMediaElement::scheduleUpdateMediaState):
>+        * platform/ContentType.cpp:
>+        (WebCore::ContentType::toJSONString const):
>+        * platform/ContentType.h:
>+        (WTF::LogArgument<WebCore::ContentType>::toString):
>+        * platform/MediaSample.h:
>+        (WebCore::MediaSample::toJSONString const):
>+        (WTF::LogArgument<WebCore::MediaSample>::toString):
>+        * platform/graphics/FloatSize.cpp:
>+        (WebCore::FloatSize::toJSONObject const):
>+        (WebCore::FloatSize::toJSONString const):
>+        * platform/graphics/FloatSize.h:
>+        (WTF::LogArgument<WebCore::FloatSize>::toString):
>+        * platform/graphics/MediaSourcePrivate.h:
>+        (WebCore::MediaSourcePrivate::mediaSourceLogIdentifier):
>+        (WTF::LogArgument<WebCore::MediaSourcePrivate::AddStatus>::toString):
>+        (WTF::LogArgument<WebCore::MediaSourcePrivate::EndOfStreamStatus>::toString):
>+        * platform/graphics/SourceBufferPrivate.h:
>+        (WebCore::SourceBufferPrivate::sourceBufferLogger const):
>+        (WebCore::SourceBufferPrivate::sourceBufferLogIdentifier):
>+        * platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::setMuted):
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::setClosedCaptionsVisible):
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::isCurrentPlaybackTargetWireless const):
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::wirelessVideoPlaybackDisabled const):
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::setWirelessVideoPlaybackDisabled):
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::setShouldPlayToPlaybackTarget):
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::setShouldBufferData):
>+        * platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.h:
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::mediaPlayerLogIdentifier):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::mediaPlayerLogger):
>+        (WTF::LogArgument<WebCore::MediaPlayerPrivateMediaSourceAVFObjC::SeekState>::toString):
>+        * platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.mm:
>+        (WebCore::convertEnumerationToString):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::MediaPlayerPrivateMediaSourceAVFObjC):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::~MediaPlayerPrivateMediaSourceAVFObjC):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::load):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::play):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::playInternal):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::pause):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::pauseInternal):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setVolume):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setMuted):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setVisible):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::seekWithTolerance):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::seekInternal):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::waitForSeekCompleted):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::seekCompleted):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setPreservesPitch):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setHasAvailableVideoFrame):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::updateAllRenderersHaveAvailableSamples):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::durationChanged):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setNaturalSize):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setCDMSession):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::outputObscuredDueToInsufficientExternalProtectionChanged):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::cdmInstanceAttached):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::cdmInstanceDetached):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::attemptToDecryptWithInstance):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::waitingForKeyChanged):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::initializationDataEncountered):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setReadyState):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setNetworkState):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::setShouldPlayToPlaybackTarget):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::isCurrentPlaybackTargetWireless const):
>+        (WebCore::MediaPlayerPrivateMediaSourceAVFObjC::logChannel const):
>+        * platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaStreamAVFObjC.mm:
>+        (WebCore::MediaPlayerPrivateMediaStreamAVFObjC::enqueueVideoSample):
>+        * platform/graphics/avfoundation/objc/MediaSampleAVFObjC.h:
>+        * platform/graphics/avfoundation/objc/MediaSampleAVFObjC.mm:
>+        (WebCore::MediaSampleAVFObjC::toJSONString const):
>+        * platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.h:
>+        * platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.mm:
>+        (WebCore::MediaSourcePrivateAVFObjC::MediaSourcePrivateAVFObjC):
>+        (WebCore::MediaSourcePrivateAVFObjC::~MediaSourcePrivateAVFObjC):
>+        (WebCore::MediaSourcePrivateAVFObjC::addSourceBuffer):
>+        (WebCore::MediaSourcePrivateAVFObjC::logChannel const):
>+        * platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.h:
>+        * platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm:
>+        (WebCore::bufferWasConsumedCallback):
>+        (WebCore::SourceBufferPrivateAVFObjC::SourceBufferPrivateAVFObjC):
>+        (WebCore::SourceBufferPrivateAVFObjC::~SourceBufferPrivateAVFObjC):
>+        (WebCore::SourceBufferPrivateAVFObjC::didParseStreamDataAsAsset):
>+        (WebCore::SourceBufferPrivateAVFObjC::didFailToParseStreamDataWithError):
>+        (WebCore::SourceBufferPrivateAVFObjC::processCodedFrame):
>+        (WebCore::SourceBufferPrivateAVFObjC::willProvideContentKeyRequestInitializationDataForTrackID):
>+        (WebCore::SourceBufferPrivateAVFObjC::didProvideContentKeyRequestInitializationDataForTrackID):
>+        (WebCore::SourceBufferPrivateAVFObjC::append):
>+        (WebCore::SourceBufferPrivateAVFObjC::abort):
>+        (WebCore::SourceBufferPrivateAVFObjC::resetParserState):
>+        (WebCore::SourceBufferPrivateAVFObjC::removedFromMediaSource):
>+        (WebCore::SourceBufferPrivateAVFObjC::setReadyState):
>+        (WebCore::SourceBufferPrivateAVFObjC::trackDidChangeEnabled):
>+        (WebCore::SourceBufferPrivateAVFObjC::setCDMSession):
>+        (WebCore::SourceBufferPrivateAVFObjC::setCDMInstance):
>+        (WebCore::SourceBufferPrivateAVFObjC::layerDidReceiveError):
>+        (WebCore::SourceBufferPrivateAVFObjC::outputObscuredDueToInsufficientExternalProtectionChanged):
>+        (WebCore::SourceBufferPrivateAVFObjC::flush):
>+        (WebCore::SourceBufferPrivateAVFObjC::flushVideo):
>+        (WebCore::SourceBufferPrivateAVFObjC::enqueueSample):
>+        (WebCore::SourceBufferPrivateAVFObjC::bufferWasConsumed):
>+        (WebCore::SourceBufferPrivateAVFObjC::setActive):
>+        (WebCore::SourceBufferPrivateAVFObjC::willSeek):
>+        (WebCore::SourceBufferPrivateAVFObjC::didBecomeReadyForMoreSamples):
>+        (WebCore::SourceBufferPrivateAVFObjC::canSwitchToType):
>+        (WebCore::SourceBufferPrivateAVFObjC::setDecompressionSession):
>+        (WebCore::SourceBufferPrivateAVFObjC::logChannel const):
>+
> 2019-02-06  John Wilander  <wilander@apple.com>
> 
>         Forward Ad Click Attribution data from HTMLAnchorElement::handleClick() to WebKit::NavigationActionData
>diff --git a/Source/WTF/wtf/LoggerHelper.h b/Source/WTF/wtf/LoggerHelper.h
>index f04f26f456d4424e2a2175c8905123d33eaa466d..e82647447c18d408590bc1eb0d0612434e580da5 100644
>--- a/Source/WTF/wtf/LoggerHelper.h
>+++ b/Source/WTF/wtf/LoggerHelper.h
>@@ -50,6 +50,12 @@ public:
> #define DEBUG_LOG(...)      logger().debug(logChannel(), __VA_ARGS__)
> #define WILL_LOG(_level_)   logger().willLog(logChannel(), _level_)
> 
>+    const void* childLogIdentifier(uint64_t identifier) const
>+    {
>+        static const int64_t parentMask = 0xffffffffffff0000l;
>+        static const int64_t maskLowerWord = 0xffffl;
>+        return reinterpret_cast<const void*>((reinterpret_cast<uint64_t>(logIdentifier()) & parentMask) | (identifier & maskLowerWord));
>+    }
> #else
> 
> #define LOGIDENTIFIER (WTF::nullopt)
>diff --git a/Source/WTF/wtf/MediaTime.cpp b/Source/WTF/wtf/MediaTime.cpp
>index 417550c3b5c2ec931752bd9a28a566d56b885014..87c7fbd88f6786364cd84f4b2c45622ee341e406 100644
>--- a/Source/WTF/wtf/MediaTime.cpp
>+++ b/Source/WTF/wtf/MediaTime.cpp
>@@ -598,33 +598,34 @@ String MediaTime::toString() const
>     return builder.toString();
> }
> 
>-static Ref<JSON::Object> toJSONStringInternal(const MediaTime& time)
>+Ref<JSON::Object> MediaTime::toJSONObject() const
> {
>     auto object = JSON::Object::create();
> 
>-    if (time.hasDoubleValue())
>-        object->setDouble("value"_s, time.toDouble());
>-    else {
>-        if (time.isInvalid() || time.isIndefinite())
>-            object->setString("value"_s, "NaN"_s);
>-        else if (time.isPositiveInfinite())
>-            object->setString("value"_s, "POSITIVE_INFINITY"_s);
>-        else if (time.isNegativeInfinite())
>-            object->setString("value"_s, "NEGATIVE_INFINITY"_s);
>-        else
>-            object->setDouble("value"_s, time.toDouble());
>-
>-        object->setInteger("numerator"_s, static_cast<int>(time.timeValue()));
>-        object->setInteger("denominator"_s, time.timeScale());
>-        object->setInteger("flags"_s, time.timeFlags());
>+    if (hasDoubleValue()) {
>+        object->setDouble("value"_s, toDouble());
>+        return object;
>     }
> 
>+    if (isInvalid() || isIndefinite())
>+        object->setString("value"_s, "NaN"_s);
>+    else if (isPositiveInfinite())
>+        object->setString("value"_s, "POSITIVE_INFINITY"_s);
>+    else if (isNegativeInfinite())
>+        object->setString("value"_s, "NEGATIVE_INFINITY"_s);
>+    else
>+        object->setDouble("value"_s, toDouble());
>+
>+    object->setDouble("numerator"_s, static_cast<double>(m_timeValue));
>+    object->setInteger("denominator"_s, m_timeScale);
>+    object->setInteger("flags"_s, m_timeFlags);
>+
>     return object;
> }
> 
> String MediaTime::toJSONString() const
> {
>-    return toJSONStringInternal(*this)->toJSONString();
>+    return toJSONObject()->toJSONString();
> }
> 
> MediaTime abs(const MediaTime& rhs)
>@@ -645,8 +646,8 @@ String MediaTimeRange::toJSONString() const
> {
>     auto object = JSON::Object::create();
> 
>-    object->setObject("start"_s, toJSONStringInternal(start));
>-    object->setObject("end"_s, toJSONStringInternal(end));
>+    object->setObject("start"_s, start.toJSONObject());
>+    object->setObject("end"_s, end.toJSONObject());
> 
>     return object->toJSONString();
> }
>diff --git a/Source/WTF/wtf/MediaTime.h b/Source/WTF/wtf/MediaTime.h
>index 7cb78978ba9f6de33eb95dc52588ce68d8f0145f..b3478fe9c0c063b857f0a30924eb1acc3c799eae 100644
>--- a/Source/WTF/wtf/MediaTime.h
>+++ b/Source/WTF/wtf/MediaTime.h
>@@ -29,6 +29,7 @@
> #pragma once
> 
> #include <wtf/FastMalloc.h>
>+#include <wtf/JSONValues.h>
> #include <wtf/text/WTFString.h>
> 
> #include <cmath>
>@@ -111,6 +112,7 @@ public:
>     void dump(PrintStream& out) const;
>     String toString() const;
>     String toJSONString() const;
>+    Ref<JSON::Object> toJSONObject() const;
> 
>     // Make the following casts errors:
>     operator double() const = delete;
>diff --git a/Source/WebCore/Modules/mediasource/MediaSource.cpp b/Source/WebCore/Modules/mediasource/MediaSource.cpp
>index 3986198992ae3ed5011972e10915a2f5c8285f19..28350d45bf1a6445c843ca4d3f060ef8c7e95239 100644
>--- a/Source/WebCore/Modules/mediasource/MediaSource.cpp
>+++ b/Source/WebCore/Modules/mediasource/MediaSource.cpp
>@@ -51,23 +51,33 @@
> 
> namespace WebCore {
> 
>-#if !LOG_DISABLED
>-namespace MediaSourceInternal {
>-static const char* toString(MediaSource::ReadyState readyState)
>+String convertEnumerationToString(MediaSourcePrivate::AddStatus enumerationValue)
> {
>-    switch (readyState) {
>-    case MediaSource::ReadyState::Closed:
>-        return "closed";
>-    case MediaSource::ReadyState::Ended:
>-        return "ended";
>-    case MediaSource::ReadyState::Open:
>-        return "open";
>-    default:
>-        return "(unknown)";
>-    }
>+    static const NeverDestroyed<String> values[] = {
>+        MAKE_STATIC_STRING_IMPL("Ok"),
>+        MAKE_STATIC_STRING_IMPL("NotSupported"),
>+        MAKE_STATIC_STRING_IMPL("ReachedIdLimit"),
>+    };
>+    static_assert(static_cast<size_t>(MediaSourcePrivate::AddStatus::Ok) == 0, "MediaSourcePrivate::AddStatus::Ok is not 0 as expected");
>+    static_assert(static_cast<size_t>(MediaSourcePrivate::AddStatus::NotSupported) == 1, "MediaSourcePrivate::AddStatus::NotSupported is not 1 as expected");
>+    static_assert(static_cast<size_t>(MediaSourcePrivate::AddStatus::ReachedIdLimit) == 2, "MediaSourcePrivate::AddStatus::ReachedIdLimit is not 2 as expected");
>+    ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
>+    return values[static_cast<size_t>(enumerationValue)];
> }
>+
>+String convertEnumerationToString(MediaSourcePrivate::EndOfStreamStatus enumerationValue)
>+{
>+    static const NeverDestroyed<String> values[] = {
>+        MAKE_STATIC_STRING_IMPL("EosNoError"),
>+        MAKE_STATIC_STRING_IMPL("EosNetworkError"),
>+        MAKE_STATIC_STRING_IMPL("EosDecodeError"),
>+    };
>+    static_assert(static_cast<size_t>(MediaSourcePrivate::EndOfStreamStatus::EosNoError) == 0, "MediaSourcePrivate::EndOfStreamStatus::EosNoError is not 0 as expected");
>+    static_assert(static_cast<size_t>(MediaSourcePrivate::EndOfStreamStatus::EosNetworkError) == 1, "MediaSourcePrivate::EndOfStreamStatus::EosNetworkError is not 1 as expected");
>+    static_assert(static_cast<size_t>(MediaSourcePrivate::EndOfStreamStatus::EosDecodeError) == 2, "MediaSourcePrivate::EndOfStreamStatus::EosDecodeError is not 2 as expected");
>+    ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
>+    return values[static_cast<size_t>(enumerationValue)];
> }
>-#endif
> 
> URLRegistry* MediaSource::s_registry;
> 
>@@ -89,20 +99,23 @@ MediaSource::MediaSource(ScriptExecutionContext& context)
>     , m_duration(MediaTime::invalidTime())
>     , m_pendingSeekTime(MediaTime::invalidTime())
>     , m_asyncEventQueue(*this)
>+#if !RELEASE_LOG_DISABLED
>+    , m_logger(downcast<Document>(context).logger())
>+#endif
> {
>-    LOG(MediaSource, "MediaSource::MediaSource %p", this);
>     m_sourceBuffers = SourceBufferList::create(scriptExecutionContext());
>     m_activeSourceBuffers = SourceBufferList::create(scriptExecutionContext());
> }
> 
> MediaSource::~MediaSource()
> {
>-    LOG(MediaSource, "MediaSource::~MediaSource %p", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     ASSERT(isClosed());
> }
> 
> void MediaSource::setPrivateAndOpen(Ref<MediaSourcePrivate>&& mediaSourcePrivate)
> {
>+    DEBUG_LOG(LOGIDENTIFIER);
>     ASSERT(!m_private);
>     ASSERT(m_mediaElement);
>     m_private = WTFMove(mediaSourcePrivate);
>@@ -133,11 +146,13 @@ void MediaSource::setPrivateAndOpen(Ref<MediaSourcePrivate>&& mediaSourcePrivate
> 
> void MediaSource::addedToRegistry()
> {
>+    DEBUG_LOG(LOGIDENTIFIER);
>     setPendingActivity(*this);
> }
> 
> void MediaSource::removedFromRegistry()
> {
>+    DEBUG_LOG(LOGIDENTIFIER);
>     unsetPendingActivity(*this);
> }
> 
>@@ -148,6 +163,7 @@ MediaTime MediaSource::duration() const
> 
> void MediaSource::durationChanged(const MediaTime& duration)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, duration);
>     m_duration = duration;
> }
> 
>@@ -210,6 +226,8 @@ void MediaSource::seekToTime(const MediaTime& time)
>     if (isClosed())
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, time);
>+
>     // 2.4.3 Seeking
>     // https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#mediasource-seeking
> 
>@@ -227,7 +245,6 @@ void MediaSource::seekToTime(const MediaTime& time)
>         // 2. The media element waits until an appendBuffer() or an appendStream() call causes the coded
>         // frame processing algorithm to set the HTMLMediaElement.readyState attribute to a value greater
>         // than HAVE_METADATA.
>-        LOG(MediaSource, "MediaSource::seekToTime(%p) - waitForSeekCompleted()", this);
>         m_private->waitForSeekCompleted();
>         return;
>     }
>@@ -251,6 +268,8 @@ void MediaSource::completeSeek()
> 
>     ASSERT(m_pendingSeekTime.isValid());
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, m_pendingSeekTime);
>+
>     // 2. The media element resets all decoders and initializes each one with data from the appropriate
>     // initialization segment.
>     // 3. The media element feeds coded frames from the active track buffers into the decoders starting
>@@ -310,6 +329,8 @@ ExceptionOr<void> MediaSource::setLiveSeekableRange(double start, double end)
>     // W3C Editor's Draft 16 September 2016
>     // https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#dom-mediasource-setliveseekablerange
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, "start = ", start, ", end = ", end);
>+
>     // If the readyState attribute is not "open" then throw an InvalidStateError exception and abort these steps.
>     if (!isOpen())
>         return Exception { InvalidStateError };
>@@ -330,6 +351,8 @@ ExceptionOr<void> MediaSource::clearLiveSeekableRange()
>     // W3C Editor's Draft 16 September 2016
>     // https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#dom-mediasource-clearliveseekablerange
> 
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     // If the readyState attribute is not "open" then throw an InvalidStateError exception and abort these steps.
>     if (!isOpen())
>         return Exception { InvalidStateError };
>@@ -475,6 +498,8 @@ ExceptionOr<void> MediaSource::setDuration(double duration)
>     // 2.1 Attributes - Duration
>     // https://www.w3.org/TR/2016/REC-media-source-20161117/#attributes
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, duration);
>+
>     // On setting, run the following steps:
>     // 1. If the value being set is negative or NaN then throw a TypeError exception and abort these steps.
>     if (duration < 0.0 || std::isnan(duration))
>@@ -527,9 +552,9 @@ ExceptionOr<void> MediaSource::setDurationInternal(const MediaTime& duration)
> 
>     // 5. Update duration to new duration.
>     m_duration = newDuration;
>+    ALWAYS_LOG(LOGIDENTIFIER, duration);
> 
>     // 6. Update the media duration to new duration and run the HTMLMediaElement duration change algorithm.
>-    LOG(MediaSource, "MediaSource::setDurationInternal(%p) - duration(%s)", this, duration.toString().utf8().data());
>     m_private->durationChanged();
> 
>     return { };
>@@ -538,8 +563,6 @@ ExceptionOr<void> MediaSource::setDurationInternal(const MediaTime& duration)
> void MediaSource::setReadyState(ReadyState state)
> {
>     auto oldState = readyState();
>-    LOG(MediaSource, "MediaSource::setReadyState(%p) : %s -> %s", this, MediaSourceInternal::toString(oldState), MediaSourceInternal::toString(state));
>-
>     if (oldState == state)
>         return;
> 
>@@ -550,6 +573,8 @@ void MediaSource::setReadyState(ReadyState state)
> 
> ExceptionOr<void> MediaSource::endOfStream(Optional<EndOfStreamError> error)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     // 2.2 https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-MediaSource-endOfStream-void-EndOfStreamError-error
>     // 1. If the readyState attribute is not in the "open" state then throw an
>     // InvalidStateError exception and abort these steps.
>@@ -569,7 +594,13 @@ ExceptionOr<void> MediaSource::endOfStream(Optional<EndOfStreamError> error)
> 
> void MediaSource::streamEndedWithError(Optional<EndOfStreamError> error)
> {
>-    LOG(MediaSource, "MediaSource::streamEndedWithError(%p)", this);
>+#if !RELEASE_LOG_DISABLED
>+    if (error)
>+        ALWAYS_LOG(LOGIDENTIFIER, error.value());
>+    else
>+        ALWAYS_LOG(LOGIDENTIFIER);
>+#endif
>+
>     if (isClosed())
>         return;
> 
>@@ -632,7 +663,7 @@ void MediaSource::streamEndedWithError(Optional<EndOfStreamError> error)
> 
> ExceptionOr<Ref<SourceBuffer>> MediaSource::addSourceBuffer(const String& type)
> {
>-    LOG(MediaSource, "MediaSource::addSourceBuffer(%s) %p", type.ascii().data(), this);
>+    DEBUG_LOG(LOGIDENTIFIER, type);
> 
>     // 2.2 http://www.w3.org/TR/media-source/#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
>     // When this method is invoked, the user agent must run the following steps:
>@@ -662,6 +693,7 @@ ExceptionOr<Ref<SourceBuffer>> MediaSource::addSourceBuffer(const String& type)
>     }
> 
>     auto buffer = SourceBuffer::create(sourceBufferPrivate.releaseReturnValue(), this);
>+    DEBUG_LOG(LOGIDENTIFIER, "created SourceBuffer");
> 
>     // 6. Set the generate timestamps flag on the new object to the value in the "Generate Timestamps Flag"
>     // column of the byte stream format registry [MSE-REGISTRY] entry that is associated with type.
>@@ -686,7 +718,8 @@ ExceptionOr<Ref<SourceBuffer>> MediaSource::addSourceBuffer(const String& type)
> 
> ExceptionOr<void> MediaSource::removeSourceBuffer(SourceBuffer& buffer)
> {
>-    LOG(MediaSource, "MediaSource::removeSourceBuffer() %p", this);
>+    DEBUG_LOG(LOGIDENTIFIER);
>+
>     Ref<SourceBuffer> protect(buffer);
> 
>     // 2. If sourceBuffer specifies an object that is not in sourceBuffers then
>@@ -835,8 +868,6 @@ ExceptionOr<void> MediaSource::removeSourceBuffer(SourceBuffer& buffer)
> 
> bool MediaSource::isTypeSupported(const String& type)
> {
>-    LOG(MediaSource, "MediaSource::isTypeSupported(%s)", type.ascii().data());
>-
>     // Section 2.2 isTypeSupported() method steps.
>     // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-MediaSource-isTypeSupported-boolean-DOMString-type
>     // 1. If type is an empty string, then return false.
>@@ -882,6 +913,8 @@ bool MediaSource::isEnded() const
> 
> void MediaSource::detachFromElement(HTMLMediaElement& element)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     ASSERT_UNUSED(element, m_mediaElement == &element);
> 
>     // 2.4.2 Detaching from a media element
>@@ -929,6 +962,8 @@ void MediaSource::openIfInEndedState()
>     if (m_readyState != ReadyState::Ended)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     setReadyState(ReadyState::Open);
>     m_private->unmarkEndOfStream();
> }
>@@ -941,6 +976,8 @@ bool MediaSource::hasPendingActivity() const
> 
> void MediaSource::suspend(ReasonForSuspension reason)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, static_cast<int>(reason));
>+
>     switch (reason) {
>     case ReasonForSuspension::PageCache:
>     case ReasonForSuspension::PageWillBeSuspended:
>@@ -955,11 +992,15 @@ void MediaSource::suspend(ReasonForSuspension reason)
> 
> void MediaSource::resume()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     m_asyncEventQueue.resume();
> }
> 
> void MediaSource::stop()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     m_asyncEventQueue.close();
>     if (m_mediaElement)
>         m_mediaElement->detachMediaSource();
>@@ -979,6 +1020,8 @@ const char* MediaSource::activeDOMObjectName() const
> 
> void MediaSource::onReadyStateChange(ReadyState oldState, ReadyState newState)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, "old state = ", oldState, ", new state = ", newState);
>+
>     for (auto& buffer : *m_sourceBuffers)
>         buffer->readyStateChanged();
> 
>@@ -1029,6 +1072,8 @@ ExceptionOr<Ref<SourceBufferPrivate>> MediaSource::createSourceBufferPrivate(con
> 
> void MediaSource::scheduleEvent(const AtomicString& eventName)
> {
>+    DEBUG_LOG(LOGIDENTIFIER, "scheduling '", eventName, "'");
>+
>     auto event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::No);
>     event->setTarget(this);
> 
>@@ -1062,6 +1107,19 @@ void MediaSource::regenerateActiveSourceBuffers()
>         sourceBuffer->setBufferedDirty(true);
> }
> 
>+#if !RELEASE_LOG_DISABLED
>+void MediaSource::setLogIdentifier(const void* identifier)
>+{
>+    m_logIdentifier = identifier;
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+}
>+
>+WTFLogChannel& MediaSource::logChannel() const
>+{
>+    return LogMediaSource;
>+}
>+#endif
>+
> }
> 
> #endif
>diff --git a/Source/WebCore/Modules/mediasource/MediaSource.h b/Source/WebCore/Modules/mediasource/MediaSource.h
>index 24110fe61ce570ad27a9098087de4d7e6e425f5f..d296d0be9393a1629b1c18bbab0f0af9aa118c9e 100644
>--- a/Source/WebCore/Modules/mediasource/MediaSource.h
>+++ b/Source/WebCore/Modules/mediasource/MediaSource.h
>@@ -38,6 +38,7 @@
> #include "GenericEventQueue.h"
> #include "MediaSourcePrivateClient.h"
> #include "URLRegistry.h"
>+#include <wtf/LoggerHelper.h>
> 
> namespace WebCore {
> 
>@@ -48,7 +49,15 @@ class SourceBufferList;
> class SourceBufferPrivate;
> class TimeRanges;
> 
>-class MediaSource final : public MediaSourcePrivateClient, public ActiveDOMObject, public EventTargetWithInlineData, public URLRegistrable {
>+class MediaSource final
>+    : public MediaSourcePrivateClient
>+    , public ActiveDOMObject
>+    , public EventTargetWithInlineData
>+    , public URLRegistrable
>+#if !RELEASE_LOG_DISABLED
>+    , private LoggerHelper
>+#endif
>+{
> public:
>     static void setRegistry(URLRegistry*);
>     static MediaSource* lookup(const String& url) { return s_registry ? static_cast<MediaSource*>(s_registry->lookup(url)) : nullptr; }
>@@ -105,6 +114,14 @@ public:
>     static const MediaTime& currentTimeFudgeFactor();
>     static bool contentTypeShouldGenerateTimestamps(const ContentType&);
> 
>+#if !RELEASE_LOG_DISABLED
>+    const Logger& logger() const final { return m_logger.get(); }
>+    const void* logIdentifier() const final { return m_logIdentifier; }
>+    const char* logClassName() const final { return "MediaSource"; }
>+    WTFLogChannel& logChannel() const final;
>+    void setLogIdentifier(const void*) final;
>+#endif
>+
> private:
>     explicit MediaSource(ScriptExecutionContext&);
> 
>@@ -151,8 +168,38 @@ private:
>     MediaTime m_pendingSeekTime;
>     ReadyState m_readyState { ReadyState::Closed };
>     GenericEventQueue m_asyncEventQueue;
>+#if !RELEASE_LOG_DISABLED
>+    Ref<const Logger> m_logger;
>+    const void* m_logIdentifier { nullptr };
>+#endif
>+};
>+
>+String convertEnumerationToString(MediaSource::EndOfStreamError);
>+String convertEnumerationToString(MediaSource::ReadyState);
>+
>+} // namespace WebCore
>+
>+namespace WTF {
>+
>+template<typename Type>
>+struct LogArgument;
>+
>+template <>
>+struct LogArgument<WebCore::MediaSource::EndOfStreamError> {
>+    static String toString(const WebCore::MediaSource::EndOfStreamError error)
>+    {
>+        return convertEnumerationToString(error);
>+    }
>+};
>+
>+template <>
>+struct LogArgument<WebCore::MediaSource::ReadyState> {
>+    static String toString(const WebCore::MediaSource::ReadyState state)
>+    {
>+        return convertEnumerationToString(state);
>+    }
> };
> 
>-}
>+} // namespace WTF
> 
> #endif
>diff --git a/Source/WebCore/Modules/mediasource/SourceBuffer.cpp b/Source/WebCore/Modules/mediasource/SourceBuffer.cpp
>index 96686a081360a5aff900ac83d46bd0b879e5923a..3eccd8a753cddfa6e6d29c05fc8f1b46236f7812 100644
>--- a/Source/WebCore/Modules/mediasource/SourceBuffer.cpp
>+++ b/Source/WebCore/Modules/mediasource/SourceBuffer.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2013 Google Inc. All rights reserved.
>- * Copyright (C) 2013-2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2013-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions are
>@@ -114,8 +114,16 @@ SourceBuffer::SourceBuffer(Ref<SourceBufferPrivate>&& sourceBufferPrivate, Media
>     , m_pendingRemoveStart(MediaTime::invalidTime())
>     , m_pendingRemoveEnd(MediaTime::invalidTime())
>     , m_removeTimer(*this, &SourceBuffer::removeTimerFired)
>+#if !RELEASE_LOG_DISABLED
>+    , m_logger(m_private->sourceBufferLogger())
>+    , m_logIdentifier(m_private->sourceBufferLogIdentifier())
>+#endif
> {
>+#if !RELEASE_LOG_DISABLED
>+    ASSERT(m_logger);
>+#endif
>     ASSERT(m_source);
>+    ALWAYS_LOG(LOGIDENTIFIER);
> 
>     m_private->setClient(this);
> }
>@@ -123,6 +131,7 @@ SourceBuffer::SourceBuffer(Ref<SourceBufferPrivate>&& sourceBufferPrivate, Media
> SourceBuffer::~SourceBuffer()
> {
>     ASSERT(isRemoved());
>+    ALWAYS_LOG(LOGIDENTIFIER);
> 
>     m_private->setClient(nullptr);
> }
>@@ -307,7 +316,7 @@ ExceptionOr<void> SourceBuffer::remove(double start, double end)
> 
> ExceptionOr<void> SourceBuffer::remove(const MediaTime& start, const MediaTime& end)
> {
>-    LOG(MediaSource, "SourceBuffer::remove(%p) - start(%lf), end(%lf)", this, start.toDouble(), end.toDouble());
>+    DEBUG_LOG(LOGIDENTIFIER, "start = ", start, ", end = ", end);
> 
>     // https://rawgit.com/w3c/media-source/45627646344eea0170dd1cbc5a3d508ca751abb8/media-source-respec.html#dom-sourcebuffer-remove
>     // Section 3.2 remove() method steps.
>@@ -468,7 +477,7 @@ void SourceBuffer::removedFromMediaSource()
> 
> void SourceBuffer::seekToTime(const MediaTime& time)
> {
>-    LOG(MediaSource, "SourceBuffer::seekToTime(%p) - time(%s)", this, toString(time).utf8().data());
>+    ALWAYS_LOG(LOGIDENTIFIER, time);
> 
>     for (auto& trackBufferPair : m_trackBufferMap) {
>         TrackBuffer& trackBuffer = trackBufferPair.value;
>@@ -596,7 +605,7 @@ ExceptionOr<void> SourceBuffer::appendBufferInternal(const unsigned char* data,
> #if USE(GSTREAMER)
>     // 5. If the buffer full flag equals true, then throw a QuotaExceededError exception and abort these step.
>     if (m_bufferFull) {
>-        LOG(MediaSource, "SourceBuffer::appendBufferInternal(%p) -  buffer full, failing with QuotaExceededError error", this);
>+        ERROR_LOG(LOGIDENTIFIER, "buffer full, failing with QuotaExceededError error");
>         return Exception { QuotaExceededError };
>     }
> #endif
>@@ -664,7 +673,7 @@ void SourceBuffer::sourceBufferPrivateAppendComplete(AppendResult result)
>     // 2. If the input buffer contains bytes that violate the SourceBuffer byte stream format specification,
>     // then run the append error algorithm with the decode error parameter set to true and abort this algorithm.
>     if (result == ParsingFailed) {
>-        LOG(MediaSource, "SourceBuffer::sourceBufferPrivateAppendComplete(%p) - result = ParsingFailed", this);
>+        ERROR_LOG(LOGIDENTIFIER, "ParsingFailed");
>         appendError(true);
>         return;
>     }
>@@ -697,7 +706,7 @@ void SourceBuffer::sourceBufferPrivateAppendComplete(AppendResult result)
>         const AtomicString& trackID = trackBufferPair.key;
> 
>         if (trackBuffer.needsReenqueueing) {
>-            LOG(MediaSource, "SourceBuffer::sourceBufferPrivateAppendComplete(%p) - reenqueuing at time (%s)", this, toString(currentMediaTime).utf8().data());
>+            DEBUG_LOG(LOGIDENTIFIER, "reenqueuing at time ", currentMediaTime);
>             reenqueueMediaForTime(trackBuffer, trackID, currentMediaTime);
>         } else
>             provideMediaData(trackBuffer, trackID);
>@@ -707,7 +716,7 @@ void SourceBuffer::sourceBufferPrivateAppendComplete(AppendResult result)
>     if (extraMemoryCost() > this->maximumBufferSize())
>         m_bufferFull = true;
> 
>-    LOG(Media, "SourceBuffer::sourceBufferPrivateAppendComplete(%p) - buffered = %s", this, toString(m_buffered->ranges()).utf8().data());
>+    DEBUG_LOG(LOGIDENTIFIER);
> }
> 
> void SourceBuffer::sourceBufferPrivateDidReceiveRenderingError(int error)
>@@ -716,7 +725,7 @@ void SourceBuffer::sourceBufferPrivateDidReceiveRenderingError(int error)
>     UNUSED_PARAM(error);
> #endif
> 
>-    LOG(MediaSource, "SourceBuffer::sourceBufferPrivateDidReceiveRenderingError(%p) - result = %i", this, error);
>+    ERROR_LOG(LOGIDENTIFIER, error);
> 
>     if (!isRemoved())
>         m_source->streamEndedWithError(MediaSource::EndOfStreamError::Decode);
>@@ -733,6 +742,9 @@ static PlatformTimeRanges removeSamplesFromTrackBuffer(const DecodeOrderSampleMa
>     MediaTime earliestSample = MediaTime::positiveInfiniteTime();
>     MediaTime latestSample = MediaTime::zeroTime();
>     size_t bytesRemoved = 0;
>+    auto logIdentifier = WTF::Logger::LogSiteIdentifier(buffer->logClassName(), logPrefix, buffer->logIdentifier());
>+    auto& logger = buffer->logger();
>+    auto willLog = logger.willLog(buffer->logChannel(), WTFLogLevelDebug);
> #else
>     UNUSED_PARAM(logPrefix);
>     UNUSED_PARAM(buffer);
>@@ -746,7 +758,11 @@ static PlatformTimeRanges removeSamplesFromTrackBuffer(const DecodeOrderSampleMa
> #endif
> 
>         const RefPtr<MediaSample>& sample = sampleIt.second;
>-        LOG(MediaSource, "SourceBuffer::%s(%p) - removing sample(%s)", logPrefix, buffer, toString(*sampleIt.second).utf8().data());
>+
>+#if !LOG_DISABLED
>+        if (willLog)
>+            logger.debug(buffer->logChannel(), logIdentifier, "removing sample ", *sampleIt.second);
>+#endif
> 
>         // Remove the erased samples from the TrackBuffer sample map.
>         trackBuffer.samples.removeSample(sample.get());
>@@ -796,8 +812,8 @@ static PlatformTimeRanges removeSamplesFromTrackBuffer(const DecodeOrderSampleMa
>         erasedRanges.unionWith(additionalErasedRanges);
> 
> #if !LOG_DISABLED
>-    if (bytesRemoved)
>-        LOG(MediaSource, "SourceBuffer::%s(%p) removed %zu bytes, start(%lf), end(%lf)", logPrefix, buffer, bytesRemoved, earliestSample.toDouble(), latestSample.toDouble());
>+    if (bytesRemoved && willLog)
>+        logger.debug(buffer->logChannel(), logIdentifier, "removed ", bytesRemoved, ", start = ", earliestSample, ", end = ", latestSample);
> #endif
> 
>     return erasedRanges;
>@@ -805,7 +821,7 @@ static PlatformTimeRanges removeSamplesFromTrackBuffer(const DecodeOrderSampleMa
> 
> void SourceBuffer::removeCodedFrames(const MediaTime& start, const MediaTime& end)
> {
>-    LOG(MediaSource, "SourceBuffer::removeCodedFrames(%p) - start(%s), end(%s)", this, toString(start).utf8().data(), toString(end).utf8().data());
>+    DEBUG_LOG(LOGIDENTIFIER, "start = ", start, ", end = ", end);
> 
>     // 3.5.9 Coded Frame Removal Algorithm
>     // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#sourcebuffer-coded-frame-removal
>@@ -835,10 +851,7 @@ void SourceBuffer::removeCodedFrames(const MediaTime& start, const MediaTime& en
>             std::pair<RefPtr<MediaSample>, RefPtr<MediaSample>> replacementSamples = sample->divide(time);
>             if (!replacementSamples.first || !replacementSamples.second)
>                 return;
>-            LOG(MediaSource, "SourceBuffer::removeCodedFrames(%p) - splitting sample (%s) into\n\t(%s)\n\t(%s)", this,
>-                toString(sample).utf8().data(),
>-                toString(replacementSamples.first).utf8().data(),
>-                toString(replacementSamples.second).utf8().data());
>+            DEBUG_LOG(LOGIDENTIFIER, "splitting sample ", *sample, " into ", *replacementSamples.first, " and ", *replacementSamples.second);
>             trackBuffer.samples.removeSample(sample.get());
>             trackBuffer.samples.addSample(*replacementSamples.first);
>             trackBuffer.samples.addSample(*replacementSamples.second);
>@@ -947,7 +960,7 @@ void SourceBuffer::evictCodedFrames(size_t newDataSize)
>     MediaTime maximumRangeEnd = currentTime - thirtySeconds;
> 
> #if !LOG_DISABLED
>-    LOG(MediaSource, "SourceBuffer::evictCodedFrames(%p) - currentTime = %lf, require %zu bytes, maximum buffer size is %zu", this, m_source->currentTime().toDouble(), extraMemoryCost() + newDataSize, maximumBufferSize);
>+    DEBUG_LOG(LOGIDENTIFIER, "currentTime = ", m_source->currentTime(), ", require ", extraMemoryCost() + newDataSize, " bytes, maximum buffer size is ", maximumBufferSize);
>     size_t initialBufferedSize = extraMemoryCost();
> #endif
> 
>@@ -966,10 +979,12 @@ void SourceBuffer::evictCodedFrames(size_t newDataSize)
>         rangeEnd += thirtySeconds;
>     }
> 
>+#if !LOG_DISABLED
>     if (!m_bufferFull) {
>-        LOG(MediaSource, "SourceBuffer::evictCodedFrames(%p) - evicted %zu bytes", this, initialBufferedSize - extraMemoryCost());
>+        DEBUG_LOG(LOGIDENTIFIER, "evicted ", initialBufferedSize - extraMemoryCost());
>         return;
>     }
>+#endif
> 
>     // If there still isn't enough free space and there buffers in time ranges after the current range (ie. there is a gap after
>     // the current buffered range), delete 30 seconds at a time from duration back to the current time range or 30 seconds after
>@@ -977,7 +992,9 @@ void SourceBuffer::evictCodedFrames(size_t newDataSize)
>     auto buffered = m_buffered->ranges();
>     size_t currentTimeRange = buffered.find(currentTime);
>     if (currentTimeRange == notFound || currentTimeRange == buffered.length() - 1) {
>-        LOG(MediaSource, "SourceBuffer::evictCodedFrames(%p) - evicted %zu bytes but FAILED to free enough", this, initialBufferedSize - extraMemoryCost());
>+#if !LOG_DISABLED
>+        ERROR_LOG(LOGIDENTIFIER, "evicted ", initialBufferedSize - extraMemoryCost(), " bytes but FAILED to free enough");
>+#endif
>         return;
>     }
> 
>@@ -1009,7 +1026,12 @@ void SourceBuffer::evictCodedFrames(size_t newDataSize)
>         rangeEnd -= thirtySeconds;
>     }
> 
>-    LOG(MediaSource, "SourceBuffer::evictCodedFrames(%p) - evicted %zu bytes%s", this, initialBufferedSize - extraMemoryCost(), m_bufferFull ? "" : " but FAILED to free enough");
>+#if !LOG_DISABLED
>+    if (m_bufferFull)
>+        ERROR_LOG(LOGIDENTIFIER, "evicted ", initialBufferedSize - extraMemoryCost(), " but FAILED to free enough");
>+    else
>+        DEBUG_LOG(LOGIDENTIFIER, "evicted ", initialBufferedSize - extraMemoryCost());
>+#endif
> }
> 
> size_t SourceBuffer::maximumBufferSize() const
>@@ -1061,7 +1083,7 @@ void SourceBuffer::sourceBufferPrivateDidReceiveInitializationSegment(const Init
>     if (isRemoved())
>         return;
> 
>-    LOG(MediaSource, "SourceBuffer::sourceBufferPrivateDidReceiveInitializationSegment(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
> 
>     // 3.5.8 Initialization Segment Received (ctd)
>     // https://rawgit.com/w3c/media-source/c3ad59c7a370d04430969ba73d18dc9bcde57a33/index.html#sourcebuffer-init-segment-received [Editor's Draft 09 January 2015]
>@@ -1566,7 +1588,7 @@ void SourceBuffer::sourceBufferPrivateDidReceiveSample(MediaSample& sample)
>             sample.offsetTimestampsBy(trackBuffer.roundedTimestampOffset);
>         }
> 
>-        LOG(MediaSourceSamples, "SourceBuffer::sourceBufferPrivateDidReceiveSample(%p) - sample(%s)", this, toString(sample).utf8().data());
>+        DEBUG_LOG(LOGIDENTIFIER, sample);
> 
>         // 1.7 Let frame end timestamp equal the sum of presentation timestamp and frame duration.
>         MediaTime frameEndTimestamp = presentationTimestamp + frameDuration;
>@@ -1590,7 +1612,7 @@ void SourceBuffer::sourceBufferPrivateDidReceiveSample(MediaSample& sample)
>         // the presentation timestamp.
>         MediaTime presentationStartTime = MediaTime::zeroTime();
>         if (presentationTimestamp < presentationStartTime) {
>-            LOG(MediaSource, "SourceBuffer::sourceBufferPrivateDidReceiveSample(%p) - failing because presentationTimestamp < presentationStartTime", this);
>+            ERROR_LOG(LOGIDENTIFIER, "failing because presentationTimestamp (", presentationTimestamp, ") < presentationStartTime (", presentationStartTime, ")");
>             m_source->streamEndedWithError(MediaSource::EndOfStreamError::Decode);
>             return;
>         }
>@@ -1953,7 +1975,7 @@ void SourceBuffer::sourceBufferPrivateReenqueSamples(const AtomicString& trackID
>     if (isRemoved())
>         return;
> 
>-    LOG(MediaSource, "SourceBuffer::sourceBufferPrivateReenqueSamples(%p)", this);
>+    DEBUG_LOG(LOGIDENTIFIER);
>     auto it = m_trackBufferMap.find(trackID);
>     if (it == m_trackBufferMap.end())
>         return;
>@@ -1968,7 +1990,7 @@ void SourceBuffer::sourceBufferPrivateDidBecomeReadyForMoreSamples(const AtomicS
>     if (isRemoved())
>         return;
> 
>-    LOG(MediaSource, "SourceBuffer::sourceBufferPrivateDidBecomeReadyForMoreSamples(%p)", this);
>+    DEBUG_LOG(LOGIDENTIFIER);
>     auto it = m_trackBufferMap.find(trackID);
>     if (it == m_trackBufferMap.end())
>         return;
>@@ -2023,7 +2045,9 @@ void SourceBuffer::provideMediaData(TrackBuffer& trackBuffer, const AtomicString
> #endif
>     }
> 
>-    LOG(MediaSource, "SourceBuffer::provideMediaData(%p) - Enqueued %u samples, %zu remaining", this, enqueuedSamples, static_cast<size_t>(trackBuffer.decodeQueue.size()));
>+#if !LOG_DISABLED
>+    DEBUG_LOG(LOGIDENTIFIER, "Enqueued ", enqueuedSamples, " samples, ", static_cast<size_t>(trackBuffer.decodeQueue.size()), " remaining");
>+#endif
> 
>     trySignalAllSamplesInTrackEnqueued(trackID);
> }
>@@ -2031,7 +2055,7 @@ void SourceBuffer::provideMediaData(TrackBuffer& trackBuffer, const AtomicString
> void SourceBuffer::trySignalAllSamplesInTrackEnqueued(const AtomicString& trackID)
> {
>     if (m_source->isEnded() && m_trackBufferMap.get(trackID).decodeQueue.empty()) {
>-        LOG(MediaSource, "SourceBuffer::trySignalAllSamplesInTrackEnqueued(%p) - All samples in track \"%s\" enqueued.", this, trackID.string().utf8().data());
>+        DEBUG_LOG(LOGIDENTIFIER, "All samples in track ", trackID, " enqueued");
>         m_private->allSamplesInTrackEnqueued(trackID);
>     }
> }
>@@ -2113,7 +2137,7 @@ void SourceBuffer::monitorBufferingRate()
> 
>     m_averageBufferRate += (interval.seconds() * ExponentialMovingAverageCoefficient) * (rateSinceLastMonitor - m_averageBufferRate);
> 
>-    LOG(MediaSource, "SourceBuffer::monitorBufferingRate(%p) - m_avegareBufferRate: %lf", this, m_averageBufferRate);
>+    DEBUG_LOG(LOGIDENTIFIER, m_averageBufferRate);
> }
> 
> void SourceBuffer::updateBufferedFromTrackBuffers()
>@@ -2275,6 +2299,13 @@ ExceptionOr<void> SourceBuffer::setMode(AppendMode newMode)
>     return { };
> }
> 
>+#if !RELEASE_LOG_DISABLED
>+WTFLogChannel& SourceBuffer::logChannel() const
>+{
>+    return LogMediaSource;
>+}
>+#endif
>+
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/Modules/mediasource/SourceBuffer.h b/Source/WebCore/Modules/mediasource/SourceBuffer.h
>index aae7a7d36de80e73f2ef094d516018d043be258d..b77c3ecc005e3676f15bc5cd7892fb3a988ac126 100644
>--- a/Source/WebCore/Modules/mediasource/SourceBuffer.h
>+++ b/Source/WebCore/Modules/mediasource/SourceBuffer.h
>@@ -42,6 +42,7 @@
> #include "TextTrack.h"
> #include "Timer.h"
> #include "VideoTrack.h"
>+#include <wtf/LoggerHelper.h>
> 
> namespace WebCore {
> 
>@@ -54,7 +55,18 @@ class TextTrackList;
> class TimeRanges;
> class VideoTrackList;
> 
>-class SourceBuffer final : public RefCounted<SourceBuffer>, public ActiveDOMObject, public EventTargetWithInlineData, private SourceBufferPrivateClient, private AudioTrackClient, private VideoTrackClient, private TextTrackClient {
>+class SourceBuffer final
>+    : public RefCounted<SourceBuffer>
>+    , public ActiveDOMObject
>+    , public EventTargetWithInlineData
>+    , private SourceBufferPrivateClient
>+    , private AudioTrackClient
>+    , private VideoTrackClient
>+    , private TextTrackClient
>+#if !RELEASE_LOG_DISABLED
>+    , private LoggerHelper
>+#endif
>+{
> public:
>     static Ref<SourceBuffer> create(Ref<SourceBufferPrivate>&&, MediaSource*);
>     virtual ~SourceBuffer();
>@@ -118,6 +130,13 @@ public:
> 
>     void trySignalAllSamplesEnqueued();
> 
>+#if !RELEASE_LOG_DISABLED
>+    const Logger& logger() const final { ASSERT(m_logger); return *m_logger.get(); }
>+    const void* logIdentifier() const final { return m_logIdentifier; }
>+    const char* logClassName() const final { return "SourceBuffer"; }
>+    WTFLogChannel& logChannel() const final;
>+#endif
>+
> private:
>     SourceBuffer(Ref<SourceBufferPrivate>&&, MediaSource*);
> 
>@@ -231,6 +250,11 @@ private:
>     MediaTime m_pendingRemoveEnd;
>     Timer m_removeTimer;
> 
>+#if !RELEASE_LOG_DISABLED
>+    RefPtr<const Logger> m_logger;
>+    const void* m_logIdentifier;
>+#endif
>+
>     bool m_updating { false };
>     bool m_receivedFirstInitializationSegment { false };
>     bool m_active { false };
>diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
>index 31f442bf75292b1c30bbf9ad2c2a234e8fd1b00d..050555ba9491f47ca0bb4dfdaaa193d9ac54edf9 100644
>--- a/Source/WebCore/dom/Document.cpp
>+++ b/Source/WebCore/dom/Document.cpp
>@@ -8569,7 +8569,6 @@ static MessageSource messageSourceForWTFLogChannel(const WTFLogChannel& channel)
>     if (equalIgnoringASCIICase(webrtcChannel, channel.name))
>         return MessageSource::WebRTC;
> 
>-    ASSERT_NOT_REACHED();
>     return MessageSource::Other;
> }
> 
>@@ -8603,11 +8602,14 @@ void Document::didLogMessage(const WTFLogChannel& channel, WTFLogLevel level, Ve
> 
>     ASSERT(sessionID().isAlwaysOnLoggingAllowed());
> 
>-    m_logMessageTaskQueue.enqueueTask([this, channel, level, logMessages = WTFMove(logMessages)]() mutable {
>+    auto messageSource = messageSourceForWTFLogChannel(channel);
>+    if (messageSource == MessageSource::Other)
>+        return;
>+
>+    m_logMessageTaskQueue.enqueueTask([this, level, messageSource, logMessages = WTFMove(logMessages)]() mutable {
>         if (!page())
>             return;
> 
>-        auto messageSource = messageSourceForWTFLogChannel(channel);
>         auto messageLevel = messageLevelFromWTFLogLevel(level);
>         auto message = std::make_unique<Inspector::ConsoleMessage>(messageSource, MessageType::Log, messageLevel, WTFMove(logMessages), mainWorldExecState(frame()));
> 
>diff --git a/Source/WebCore/html/HTMLMediaElement.cpp b/Source/WebCore/html/HTMLMediaElement.cpp
>index 86c30fb8ac444d450f0683fd96542f10f8932f9a..ab1ebd803c0614170584f4027f3be30ad860603f 100644
>--- a/Source/WebCore/html/HTMLMediaElement.cpp
>+++ b/Source/WebCore/html/HTMLMediaElement.cpp
>@@ -228,11 +228,11 @@ String convertEnumerationToString(HTMLMediaElement::ReadyState enumerationValue)
>         MAKE_STATIC_STRING_IMPL("HAVE_FUTURE_DATA"),
>         MAKE_STATIC_STRING_IMPL("HAVE_ENOUGH_DATA"),
>     };
>-    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_NOTHING) == 0, "HTMLMediaElement::HAVE_NOTHING is not 0 as expected");
>-    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_METADATA) == 1, "HTMLMediaElement::HAVE_METADATA is not 1 as expected");
>-    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_CURRENT_DATA) == 2, "HTMLMediaElement::HAVE_CURRENT_DATA is not 2 as expected");
>-    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_FUTURE_DATA) == 3, "HTMLMediaElement::HAVE_FUTURE_DATA is not 3 as expected");
>-    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_ENOUGH_DATA) == 4, "HTMLMediaElement::HAVE_ENOUGH_DATA is not 4 as expected");
>+    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_NOTHING) == 0, "HTMLMediaElementEnums::HAVE_NOTHING is not 0 as expected");
>+    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_METADATA) == 1, "HTMLMediaElementEnums::HAVE_METADATA is not 1 as expected");
>+    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_CURRENT_DATA) == 2, "HTMLMediaElementEnums::HAVE_CURRENT_DATA is not 2 as expected");
>+    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_FUTURE_DATA) == 3, "HTMLMediaElementEnums::HAVE_FUTURE_DATA is not 3 as expected");
>+    static_assert(static_cast<size_t>(HTMLMediaElementEnums::HAVE_ENOUGH_DATA) == 4, "HTMLMediaElementEnums::HAVE_ENOUGH_DATA is not 4 as expected");
>     ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
>     return values[static_cast<size_t>(enumerationValue)];
> }
>@@ -1097,7 +1097,7 @@ void HTMLMediaElement::scheduleCheckPlaybackTargetCompatability()
>     ALWAYS_LOG(logSiteIdentifier, "task scheduled");
>     m_checkPlaybackTargetCompatablityTask.scheduleTask([this, logSiteIdentifier] {
>         UNUSED_PARAM(logSiteIdentifier);
>-        ALWAYS_LOG(logSiteIdentifier, "- lambda(), task fired");
>+        ALWAYS_LOG(logSiteIdentifier, "lambda(), task fired");
>         checkPlaybackTargetCompatablity();
>     });
> }
>@@ -1350,7 +1350,13 @@ void HTMLMediaElement::selectMediaResource()
>     // put into the background.
>     m_mediaSession->removeBehaviorRestriction(MediaElementSession::RequirePageConsentToLoadMedia);
> 
>-    m_resourceSelectionTaskQueue.enqueueTask([this]  {
>+    auto logSiteIdentifier = LOGIDENTIFIER;
>+    UNUSED_PARAM(logSiteIdentifier);
>+
>+    m_resourceSelectionTaskQueue.enqueueTask([this, logSiteIdentifier]  {
>+
>+        ALWAYS_LOG(logSiteIdentifier, "lambda(), task fired");
>+
>         // 5. If the media elementâs blocked-on-parser flag is false, then populate the list of pending text tracks.
> #if ENABLE(VIDEO_TRACK)
>         if (hasMediaControls())
>@@ -1380,7 +1386,7 @@ void HTMLMediaElement::selectMediaResource()
>             mode = Attribute;
>             ASSERT(m_player);
>             if (!m_player) {
>-                ERROR_LOG(LOGIDENTIFIER, " - has srcAttr but m_player is not created");
>+                ERROR_LOG(logSiteIdentifier, " has srcAttr but m_player is not created");
>                 return;
>             }
>         } else if (auto firstSource = childrenOfType<HTMLSourceElement>(*this).first()) {
>@@ -1397,7 +1403,7 @@ void HTMLMediaElement::selectMediaResource()
>             setShouldDelayLoadEvent(false);
>             m_networkState = NETWORK_EMPTY;
> 
>-            ALWAYS_LOG(LOGIDENTIFIER, "nothing to load");
>+            ALWAYS_LOG(logSiteIdentifier, "nothing to load");
>             return;
>         }
> 
>@@ -1427,7 +1433,7 @@ void HTMLMediaElement::selectMediaResource()
> 
>             ContentType contentType;
>             loadResource(URL(), contentType, String());
>-            ALWAYS_LOG(LOGIDENTIFIER, "using 'srcObject' property");
>+            ALWAYS_LOG(logSiteIdentifier, "using 'srcObject' property");
> 
>             //    If that algorithm returns without aborting this one, then the load failed.
>             // 4. Failed with media provider: Reaching this step indicates that the media resource
>@@ -1450,7 +1456,7 @@ void HTMLMediaElement::selectMediaResource()
>             URL absoluteURL = getNonEmptyURLAttribute(srcAttr);
>             if (absoluteURL.isEmpty()) {
>                 mediaLoadingFailed(MediaPlayer::FormatError);
>-                ALWAYS_LOG(LOGIDENTIFIER, "empty 'src'");
>+                ALWAYS_LOG(logSiteIdentifier, "empty 'src'");
>                 return;
>             }
> 
>@@ -1471,7 +1477,7 @@ void HTMLMediaElement::selectMediaResource()
>             // will have to pick a media engine based on the file extension.
>             ContentType contentType;
>             loadResource(absoluteURL, contentType, String());
>-            ALWAYS_LOG(LOGIDENTIFIER, "using 'src' attribute url");
>+            ALWAYS_LOG(logSiteIdentifier, "using 'src' attribute url");
> 
>             // 6. Failed with attribute: Reaching this step indicates that the media resource failed to load
>             //    or that the given URL could not be resolved. Queue a task to run the dedicated media source failure steps.
>@@ -1593,6 +1599,8 @@ void HTMLMediaElement::loadResource(const URL& initialURL, ContentType& contentT
> 
>     if (m_mediaSource) {
>         loadAttempted = true;
>+        
>+        ALWAYS_LOG(LOGIDENTIFIER, "loading MSE blob");
>         if (!m_mediaSource->attachToElement(*this) || !m_player->load(url, contentType, m_mediaSource.get())) {
>             // Forget our reference to the MediaSource, so we leave it alone
>             // while processing remainder of load failure.
>@@ -1609,6 +1617,7 @@ void HTMLMediaElement::loadResource(const URL& initialURL, ContentType& contentT
> 
>         if (m_mediaStreamSrcObject) {
>             loadAttempted = true;
>+            ALWAYS_LOG(LOGIDENTIFIER, "loading media stream blob");
>             if (!m_player->load(m_mediaStreamSrcObject->privateStream()))
>                 mediaLoadingFailed(MediaPlayer::FormatError);
>         }
>@@ -1617,6 +1626,7 @@ void HTMLMediaElement::loadResource(const URL& initialURL, ContentType& contentT
> 
>     if (!loadAttempted && m_blob) {
>         loadAttempted = true;
>+        ALWAYS_LOG(LOGIDENTIFIER, "loading generic blob");
>         if (!m_player->load(m_blob->url(), contentType, keySystem))
>             mediaLoadingFailed(MediaPlayer::FormatError);
>     }
>@@ -1773,7 +1783,7 @@ void HTMLMediaElement::updateActiveTextTrackCues(const MediaTime& movieTime)
>                 return;
> 
>             auto currentMediaTime = weakThis->currentMediaTime();
>-            INFO_LOG(LOGIDENTIFIER, " - lambda, currentMediaTime:", currentMediaTime);
>+            INFO_LOG(LOGIDENTIFIER, " lambda, currentMediaTime:", currentMediaTime);
>             weakThis->updateActiveTextTrackCues(currentMediaTime);
>         }, nextInterestingTime);
>     }
>@@ -4526,7 +4536,7 @@ void HTMLMediaElement::scheduleConfigureTextTracks()
>     ALWAYS_LOG(logSiteIdentifier, "task scheduled");
>     m_configureTextTracksTask.scheduleTask([this, logSiteIdentifier] {
>         UNUSED_PARAM(logSiteIdentifier);
>-        ALWAYS_LOG(logSiteIdentifier, "- lambda(), task fired");
>+        ALWAYS_LOG(logSiteIdentifier, "lambda(), task fired");
>         Ref<HTMLMediaElement> protectedThis(*this); // configureTextTracks calls methods that can trigger arbitrary DOM mutations.
>         configureTextTracks();
>     });
>@@ -5080,7 +5090,7 @@ void HTMLMediaElement::scheduleMediaEngineWasUpdated()
>     ALWAYS_LOG(logSiteIdentifier, "task scheduled");
>     m_mediaEngineUpdatedTask.scheduleTask([this, logSiteIdentifier] {
>         UNUSED_PARAM(logSiteIdentifier);
>-        ALWAYS_LOG(logSiteIdentifier, "- lambda(), task fired");
>+        ALWAYS_LOG(logSiteIdentifier, "lambda(), task fired");
>         Ref<HTMLMediaElement> protectedThis(*this); // mediaEngineWasUpdated calls methods that can trigger arbitrary DOM mutations.
>         mediaEngineWasUpdated();
>     });
>@@ -5378,7 +5388,7 @@ void HTMLMediaElement::scheduleUpdatePlayState()
>     ALWAYS_LOG(logSiteIdentifier, "task scheduled");
>     m_updatePlayStateTask.scheduleTask([this, logSiteIdentifier] {
>         UNUSED_PARAM(logSiteIdentifier);
>-        ALWAYS_LOG(logSiteIdentifier, "- lambda(), task fired");
>+        ALWAYS_LOG(logSiteIdentifier, "lambda(), task fired");
>         Ref<HTMLMediaElement> protectedThis(*this); // updatePlayState calls methods that can trigger arbitrary DOM mutations.
>         updatePlayState();
>     });
>@@ -7704,7 +7714,7 @@ void HTMLMediaElement::scheduleUpdateMediaState()
>     ALWAYS_LOG(logSiteIdentifier, "task scheduled");
>     m_updateMediaStateTask.scheduleTask([this, logSiteIdentifier] {
>         UNUSED_PARAM(logSiteIdentifier);
>-        ALWAYS_LOG(logSiteIdentifier, "- lambda(), task fired");
>+        ALWAYS_LOG(logSiteIdentifier, "lambda(), task fired");
>         Ref<HTMLMediaElement> protectedThis(*this); // updateMediaState calls methods that can trigger arbitrary DOM mutations.
>         updateMediaState();
>     });
>diff --git a/Source/WebCore/platform/ContentType.cpp b/Source/WebCore/platform/ContentType.cpp
>index 7ca8be5dc809da6ef8b928c8a6fe8de96f2eb1d2..f0d2c10b88f2087ebdabf157bc81b65c58081389 100644
>--- a/Source/WebCore/platform/ContentType.cpp
>+++ b/Source/WebCore/platform/ContentType.cpp
>@@ -28,6 +28,7 @@
> #include "config.h"
> #include "ContentType.h"
> #include "HTMLParserIdioms.h"
>+#include <wtf/JSONValues.h>
> #include <wtf/NeverDestroyed.h>
> 
> namespace WebCore {
>@@ -113,4 +114,21 @@ Vector<String> ContentType::profiles() const
>     return splitParameters(parameter(profilesParameter()));
> }
> 
>+String ContentType::toJSONString() const
>+{
>+    auto object = JSON::Object::create();
>+
>+    object->setString("containerType"_s, containerType());
>+
>+    auto codecs = codecsParameter();
>+    if (!codecs.isEmpty())
>+        object->setString("codecs"_s, codecs);
>+
>+    auto profiles = profilesParameter();
>+    if (!profiles.isEmpty())
>+        object->setString("profiles"_s, profiles);
>+
>+    return object->toJSONString();
>+}
>+
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/ContentType.h b/Source/WebCore/platform/ContentType.h
>index 07a92b65e9915e06265d201dc941b5774982419f..c82b5b7197c9e15d1e2f547fd5641fc5f4ec5ecf 100644
>--- a/Source/WebCore/platform/ContentType.h
>+++ b/Source/WebCore/platform/ContentType.h
>@@ -46,10 +46,26 @@ public:
>     Vector<String> profiles() const;
>     const String& raw() const { return m_type; }
>     bool isEmpty() const { return m_type.isEmpty(); }
>+
>+    String toJSONString() const;
>+
> private:
>     String m_type;
> };
> 
> } // namespace WebCore
> 
>+namespace WTF {
>+template<typename Type> struct LogArgument;
>+
>+template <>
>+struct LogArgument<WebCore::ContentType> {
>+    static String toString(const WebCore::ContentType& type)
>+    {
>+        return type.toJSONString();
>+    }
>+};
>+
>+} // namespace WTF
>+
> #endif // ContentType_h
>diff --git a/Source/WebCore/platform/MediaSample.h b/Source/WebCore/platform/MediaSample.h
>index 751665621acd25a2dfb2ea29a1c9065ee2293118..094522c43d065aeaa25bb3fdd5137a10f0243172 100644
>--- a/Source/WebCore/platform/MediaSample.h
>+++ b/Source/WebCore/platform/MediaSample.h
>@@ -100,6 +100,7 @@ public:
>     bool hasAlpha() const { return flags() & HasAlpha; }
> 
>     virtual void dump(PrintStream&) const = 0;
>+    virtual String toJSONString() const { return { }; }
> };
> 
> } // namespace WebCore
>@@ -116,6 +117,15 @@ template<> struct EnumTraits<WebCore::MediaSample::VideoRotation> {
>     >;
> };
> 
>+template<typename Type> struct LogArgument;
>+template <>
>+struct LogArgument<WebCore::MediaSample> {
>+    static String toString(const WebCore::MediaSample& sample)
>+    {
>+        return sample.toJSONString();
>+    }
>+};
>+
> } // namespace WTF
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/FloatSize.cpp b/Source/WebCore/platform/graphics/FloatSize.cpp
>index 8bb86d7402406cf8a449bc2e58808e6e544f18ce..6c5741d6316d93c587cca260b59fa7df0e59d008 100644
>--- a/Source/WebCore/platform/graphics/FloatSize.cpp
>+++ b/Source/WebCore/platform/graphics/FloatSize.cpp
>@@ -31,6 +31,7 @@
> #include "IntSize.h"
> #include <limits>
> #include <math.h>
>+#include <wtf/JSONValues.h>
> #include <wtf/text/TextStream.h>
> 
> namespace WebCore {
>@@ -75,4 +76,19 @@ TextStream& operator<<(TextStream& ts, const FloatSize& size)
>         << " height=" << TextStream::FormatNumberRespectingIntegers(size.height());
> }
> 
>+Ref<JSON::Object> FloatSize::toJSONObject() const
>+{
>+    auto object = JSON::Object::create();
>+
>+    object->setDouble("width"_s, m_width);
>+    object->setDouble("height"_s, m_height);
>+
>+    return object;
>+}
>+
>+String FloatSize::toJSONString() const
>+{
>+    return toJSONObject()->toJSONString();
>+}
>+
> }
>diff --git a/Source/WebCore/platform/graphics/FloatSize.h b/Source/WebCore/platform/graphics/FloatSize.h
>index 9e7c90f4f4baa7b2fa7fb8bc5bb9a6a84412aa91..bc6b253078768382953f324696530e2d4fbdd24b 100644
>--- a/Source/WebCore/platform/graphics/FloatSize.h
>+++ b/Source/WebCore/platform/graphics/FloatSize.h
>@@ -28,7 +28,9 @@
> #pragma once
> 
> #include "IntPoint.h"
>+#include <wtf/JSONValues.h>
> #include <wtf/MathExtras.h>
>+#include <wtf/text/WTFString.h>
> 
> #if PLATFORM(IOS_FAMILY)
> #include <CoreGraphics/CoreGraphics.h>
>@@ -153,6 +155,9 @@ public:
>     operator D2D1_SIZE_F() const;
> #endif
> 
>+    String toJSONString() const;
>+    Ref<JSON::Object> toJSONObject() const;
>+
> private:
>     float m_width { 0 };
>     float m_height { 0 };
>@@ -259,4 +264,14 @@ WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const FloatSize&);
> namespace WTF {
> template<> struct DefaultHash<WebCore::FloatSize>;
> template<> struct HashTraits<WebCore::FloatSize>;
>-}
>+
>+template<typename Type> struct LogArgument;
>+template <>
>+struct LogArgument<WebCore::FloatSize> {
>+    static String toString(const WebCore::FloatSize& size)
>+    {
>+        return size.toJSONString();
>+    }
>+};
>+    
>+} // namespace WTF
>diff --git a/Source/WebCore/platform/graphics/MediaSourcePrivate.h b/Source/WebCore/platform/graphics/MediaSourcePrivate.h
>index db55d11e1288a736e6dd2f3faab113ec780f4653..e147f14d8e1966b8397184bd2bd87d1717826263 100644
>--- a/Source/WebCore/platform/graphics/MediaSourcePrivate.h
>+++ b/Source/WebCore/platform/graphics/MediaSourcePrivate.h
>@@ -63,7 +63,32 @@ public:
>     virtual void seekCompleted() = 0;
> };
> 
>-}
>+String convertEnumerationToString(MediaSourcePrivate::AddStatus);
>+String convertEnumerationToString(MediaSourcePrivate::EndOfStreamStatus);
>+
>+} // namespace WebCore
>+
>+namespace WTF {
>+
>+template<typename Type> struct LogArgument;
>+
>+template <>
>+struct LogArgument<WebCore::MediaSourcePrivate::AddStatus> {
>+    static String toString(const WebCore::MediaSourcePrivate::AddStatus status)
>+    {
>+        return convertEnumerationToString(status);
>+    }
>+};
>+
>+template <>
>+struct LogArgument<WebCore::MediaSourcePrivate::EndOfStreamStatus> {
>+    static String toString(const WebCore::MediaSourcePrivate::EndOfStreamStatus status)
>+    {
>+        return convertEnumerationToString(status);
>+    }
>+};
>+
>+} // namespace WTF
> 
> #endif
> #endif
>diff --git a/Source/WebCore/platform/graphics/MediaSourcePrivateClient.h b/Source/WebCore/platform/graphics/MediaSourcePrivateClient.h
>index da2ab536686604d85d8f5fc62e86a95ee1e38eb5..1941382ea2e326dd6a67eaf5c40492a177fe2b44 100644
>--- a/Source/WebCore/platform/graphics/MediaSourcePrivateClient.h
>+++ b/Source/WebCore/platform/graphics/MediaSourcePrivateClient.h
>@@ -29,6 +29,7 @@
> #if ENABLE(MEDIA_SOURCE)
> 
> #include "PlatformTimeRanges.h"
>+#include <wtf/Logger.h>
> #include <wtf/RefCounted.h>
> 
> namespace WebCore {
>@@ -45,6 +46,10 @@ public:
>     virtual std::unique_ptr<PlatformTimeRanges> buffered() const = 0;
>     virtual void seekToTime(const MediaTime&) = 0;
>     virtual void monitorSourceBuffers() = 0;
>+
>+#if !RELEASE_LOG_DISABLED
>+    virtual void setLogIdentifier(const void*) = 0;
>+#endif
> };
> 
> }
>diff --git a/Source/WebCore/platform/graphics/SourceBufferPrivate.h b/Source/WebCore/platform/graphics/SourceBufferPrivate.h
>index 3e1683f2f35c4a18a2324e9bffb803e532943eb6..fd9e87bce563e21569191d4b45df453ff3e551de 100644
>--- a/Source/WebCore/platform/graphics/SourceBufferPrivate.h
>+++ b/Source/WebCore/platform/graphics/SourceBufferPrivate.h
>@@ -64,6 +64,11 @@ public:
>     virtual Vector<String> enqueuedSamplesForTrackID(const AtomicString&) { return { }; }
> 
>     virtual bool canSwitchToType(const ContentType&) { return false; }
>+
>+#if !RELEASE_LOG_DISABLED
>+    virtual const Logger* sourceBufferLogger() const { return nullptr; }
>+    virtual const void* sourceBufferLogIdentifier() { return nullptr; }
>+#endif
> };
> 
> }
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm
>index 1567fdb7f10be64c7f9df0ac22bcfc5edd43a9cb..fd484d7340edf80fe56f2b0c05c27a66ed5620ca 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm
>@@ -1395,7 +1395,7 @@ void MediaPlayerPrivateAVFoundationObjC::setMuted(bool muted)
>     if (m_muted == muted)
>         return;
> 
>-    INFO_LOG(LOGIDENTIFIER, "- ", muted);
>+    INFO_LOG(LOGIDENTIFIER, muted);
> 
>     m_muted = muted;
> 
>@@ -1412,7 +1412,7 @@ void MediaPlayerPrivateAVFoundationObjC::setClosedCaptionsVisible(bool closedCap
>     if (!metaDataAvailable())
>         return;
> 
>-    INFO_LOG(LOGIDENTIFIER, "- ", closedCaptionsVisible);
>+    INFO_LOG(LOGIDENTIFIER, closedCaptionsVisible);
> }
> 
> void MediaPlayerPrivateAVFoundationObjC::setRateDouble(double rate)
>@@ -2813,7 +2813,7 @@ bool MediaPlayerPrivateAVFoundationObjC::isCurrentPlaybackTargetWireless() const
>     wirelessTarget = m_avPlayer && m_avPlayer.get().externalPlaybackActive;
> #endif
> 
>-    INFO_LOG(LOGIDENTIFIER, "- ", wirelessTarget);
>+    INFO_LOG(LOGIDENTIFIER, wirelessTarget);
> 
>     return wirelessTarget;
> }
>@@ -2941,14 +2941,14 @@ bool MediaPlayerPrivateAVFoundationObjC::wirelessVideoPlaybackDisabled() const
>         return !m_allowsWirelessVideoPlayback;
> 
>     m_allowsWirelessVideoPlayback = [m_avPlayer.get() allowsExternalPlayback];
>-    INFO_LOG(LOGIDENTIFIER, "- ", !m_allowsWirelessVideoPlayback);
>+    INFO_LOG(LOGIDENTIFIER, !m_allowsWirelessVideoPlayback);
> 
>     return !m_allowsWirelessVideoPlayback;
> }
> 
> void MediaPlayerPrivateAVFoundationObjC::setWirelessVideoPlaybackDisabled(bool disabled)
> {
>-    INFO_LOG(LOGIDENTIFIER, "- ", disabled);
>+    INFO_LOG(LOGIDENTIFIER, disabled);
>     m_allowsWirelessVideoPlayback = !disabled;
>     if (!m_avPlayer)
>         return;
>@@ -2982,7 +2982,7 @@ void MediaPlayerPrivateAVFoundationObjC::setShouldPlayToPlaybackTarget(bool shou
>     if (!m_playbackTarget)
>         return;
> 
>-    INFO_LOG(LOGIDENTIFIER, "- ", shouldPlay);
>+    INFO_LOG(LOGIDENTIFIER, shouldPlay);
> 
>     if (m_playbackTarget->targetType() == MediaPlaybackTarget::AVFoundation) {
>         AVOutputContext *newContext = shouldPlay ? m_outputContext.get() : nil;
>@@ -3109,7 +3109,7 @@ void MediaPlayerPrivateAVFoundationObjC::trackEnabledDidChange(bool)
> 
> void MediaPlayerPrivateAVFoundationObjC::setShouldBufferData(bool shouldBuffer)
> {
>-    INFO_LOG(LOGIDENTIFIER, "- ", shouldBuffer);
>+    INFO_LOG(LOGIDENTIFIER, shouldBuffer);
> 
>     if (m_shouldBufferData == shouldBuffer)
>         return;
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.h b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.h
>index f846adfe67302b4bbd39f4ce8f1abf41d0e64319..79f246127e2e607656eb2f0eef71813361738aec 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.h
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.h
>@@ -32,6 +32,7 @@
> #include "SourceBufferPrivateClient.h"
> #include <wtf/Function.h>
> #include <wtf/HashMap.h>
>+#include <wtf/LoggerHelper.h>
> #include <wtf/MediaTime.h>
> #include <wtf/WeakPtr.h>
> 
>@@ -57,7 +58,12 @@ class VideoTextureCopierCV;
> class WebCoreDecompressionSession;
> 
> 
>-class MediaPlayerPrivateMediaSourceAVFObjC : public MediaPlayerPrivateInterface {
>+class MediaPlayerPrivateMediaSourceAVFObjC
>+    : public MediaPlayerPrivateInterface
>+#if !RELEASE_LOG_DISABLED
>+    , private LoggerHelper
>+#endif
>+{
> public:
>     explicit MediaPlayerPrivateMediaSourceAVFObjC(MediaPlayer*);
>     virtual ~MediaPlayerPrivateMediaSourceAVFObjC();
>@@ -141,6 +147,22 @@ public:
> 
>     WeakPtr<MediaPlayerPrivateMediaSourceAVFObjC> createWeakPtr() { return m_weakPtrFactory.createWeakPtr(*this); }
> 
>+#if !RELEASE_LOG_DISABLED
>+    const Logger& logger() const final { return m_logger.get(); }
>+    const char* logClassName() const override { return "MediaPlayerPrivateMediaSourceAVFObjC"; }
>+    const void* logIdentifier() const final { return reinterpret_cast<const void*>(m_logIdentifier); }
>+    WTFLogChannel& logChannel() const final;
>+
>+    const void* mediaPlayerLogIdentifier() { return logIdentifier(); }
>+    const Logger& mediaPlayerLogger() { return logger(); }
>+#endif
>+
>+    enum SeekState {
>+        Seeking,
>+        WaitingForAvailableFame,
>+        SeekCompleted,
>+    };
>+
> private:
>     // MediaPlayerPrivateInterface
>     void load(const String& url) override;
>@@ -292,16 +314,12 @@ private:
>     double m_rate;
>     bool m_playing;
>     bool m_seeking;
>-    enum SeekState {
>-        Seeking,
>-        WaitingForAvailableFame,
>-        SeekCompleted,
>-    };
>     SeekState m_seekCompleted { SeekCompleted };
>     mutable bool m_loadingProgressed;
>     bool m_hasBeenAskedToPaintGL { false };
>     bool m_hasAvailableVideoFrame { false };
>     bool m_allRenderersHaveAvailableSamples { false };
>+    bool m_visible { false };
>     std::unique_ptr<TextureCacheCV> m_textureCache;
>     std::unique_ptr<VideoTextureCopierCV> m_videoTextureCopier;
>     RetainPtr<CVOpenGLTextureRef> m_lastTexture;
>@@ -310,10 +328,32 @@ private:
>     bool m_shouldPlayToTarget { false };
> #endif
>     std::unique_ptr<VideoFullscreenLayerManagerObjC> m_videoFullscreenLayerManager;
>+
>+#if !RELEASE_LOG_DISABLED
>+    Ref<const Logger> m_logger;
>+    const void* m_logIdentifier;
>+#endif
> };
> 
>+String convertEnumerationToString(MediaPlayerPrivateMediaSourceAVFObjC::SeekState);
>+
> }
> 
>+namespace WTF {
>+
>+template<typename Type>
>+struct LogArgument;
>+
>+template <>
>+struct LogArgument<WebCore::MediaPlayerPrivateMediaSourceAVFObjC::SeekState> {
>+    static String toString(const WebCore::MediaPlayerPrivateMediaSourceAVFObjC::SeekState state)
>+    {
>+        return convertEnumerationToString(state);
>+    }
>+};
>+
>+} // namespace WTF
>+
> #endif // ENABLE(MEDIA_SOURCE) && USE(AVFOUNDATION)
> 
> #endif // MediaPlayerPrivateMediaSourceAVFObjC_h
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.mm
>index 4c18fcb4f6ca855ed2c93874d4069f8a5154ef6f..448d31f0d0d0dc4f18e9b42ca66622e22f69c95e 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaSourceAVFObjC.mm
>@@ -88,6 +88,20 @@ SOFT_LINK_CONSTANT(AVFoundation, AVAudioTimePitchAlgorithmVarispeed, NSString*)
> namespace WebCore {
> using namespace PAL;
> 
>+String convertEnumerationToString(MediaPlayerPrivateMediaSourceAVFObjC::SeekState enumerationValue)
>+{
>+    static const NeverDestroyed<String> values[] = {
>+        MAKE_STATIC_STRING_IMPL("Seeking"),
>+        MAKE_STATIC_STRING_IMPL("WaitingForAvailableFame"),
>+        MAKE_STATIC_STRING_IMPL("SeekCompleted"),
>+    };
>+    static_assert(static_cast<size_t>(MediaPlayerPrivateMediaSourceAVFObjC::SeekState::Seeking) == 0, "MediaPlayerPrivateMediaSourceAVFObjC::SeekState::Seeking is not 0 as expected");
>+    static_assert(static_cast<size_t>(MediaPlayerPrivateMediaSourceAVFObjC::SeekState::WaitingForAvailableFame) == 1, "MediaPlayerPrivateMediaSourceAVFObjC::SeekState::WaitingForAvailableFame is not 1 as expected");
>+    static_assert(static_cast<size_t>(MediaPlayerPrivateMediaSourceAVFObjC::SeekState::SeekCompleted) == 2, "MediaPlayerPrivateMediaSourceAVFObjC::SeekState::SeekCompleted is not 2 as expected");
>+    ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
>+    return values[static_cast<size_t>(enumerationValue)];
>+}
>+    
> #pragma mark -
> #pragma mark MediaPlayerPrivateMediaSourceAVFObjC
> 
>@@ -112,11 +126,19 @@ MediaPlayerPrivateMediaSourceAVFObjC::MediaPlayerPrivateMediaSourceAVFObjC(Media
>     , m_seeking(false)
>     , m_loadingProgressed(false)
>     , m_videoFullscreenLayerManager(std::make_unique<VideoFullscreenLayerManagerObjC>())
>+#if !RELEASE_LOG_DISABLED
>+    , m_logger(player->mediaPlayerLogger())
>+    , m_logIdentifier(player->mediaPlayerLogIdentifier())
>+#endif
> {
>     CMTimebaseRef timebase = [m_synchronizer timebase];
>     CMNotificationCenterRef nc = CMNotificationCenterGetDefaultLocalCenter();
>     CMNotificationCenterAddListener(nc, this, CMTimebaseEffectiveRateChangedCallback, kCMTimebaseNotification_EffectiveRateChanged, timebase, 0);
> 
>+    auto logSiteIdentifier = LOGIDENTIFIER;
>+    ALWAYS_LOG(logSiteIdentifier);
>+    UNUSED_PARAM(logSiteIdentifier);
>+
>     // addPeriodicTimeObserverForInterval: throws an exception if you pass a non-numeric CMTime, so just use
>     // an arbitrarily large time value of once an hour:
>     __block auto weakThis = createWeakPtr();
>@@ -128,8 +150,9 @@ MediaPlayerPrivateMediaSourceAVFObjC::MediaPlayerPrivateMediaSourceAVFObjC(Media
>         if (!weakThis)
>             return;
> 
>+        DEBUG_LOG(logSiteIdentifier, "synchronizer fired for ", toMediaTime(time), ", seeking = ", m_seeking, ", pending = ", !!m_pendingSeek);
>+
>         if (m_seeking && !m_pendingSeek) {
>-            LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::m_timeJumpedObserver(%p) - time(%s)", weakThis.get(), toString(PAL::toMediaTime(time)).utf8().data());
>             m_seeking = false;
> 
>             if (shouldBePlaying())
>@@ -145,6 +168,8 @@ MediaPlayerPrivateMediaSourceAVFObjC::MediaPlayerPrivateMediaSourceAVFObjC(Media
> 
> MediaPlayerPrivateMediaSourceAVFObjC::~MediaPlayerPrivateMediaSourceAVFObjC()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     CMTimebaseRef timebase = [m_synchronizer timebase];
>     CMNotificationCenterRef nc = CMNotificationCenterGetDefaultLocalCenter();
>     CMNotificationCenterRemoveListener(nc, this, CMTimebaseEffectiveRateChangedCallback, kCMTimebaseNotification_EffectiveRateChanged, timebase);
>@@ -229,9 +254,9 @@ void MediaPlayerPrivateMediaSourceAVFObjC::load(const String&)
>     m_player->networkStateChanged();
> }
> 
>-void MediaPlayerPrivateMediaSourceAVFObjC::load(const String& url, MediaSourcePrivateClient* client)
>+void MediaPlayerPrivateMediaSourceAVFObjC::load(const String&, MediaSourcePrivateClient* client)
> {
>-    UNUSED_PARAM(url);
>+    ALWAYS_LOG(LOGIDENTIFIER);
> 
>     m_mediaSourcePrivate = MediaSourcePrivateAVFObjC::create(this, client);
>     m_mediaSourcePrivate->setVideoLayer(m_sampleBufferDisplayLayer.get());
>@@ -262,6 +287,7 @@ PlatformLayer* MediaPlayerPrivateMediaSourceAVFObjC::platformLayer() const
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::play()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     callOnMainThread([weakThis = createWeakPtr()] {
>         if (!weakThis)
>             return;
>@@ -274,6 +300,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::playInternal()
>     if (currentMediaTime() >= m_mediaSourcePrivate->duration())
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     m_playing = true;
>     if (shouldBePlaying())
>         [m_synchronizer setRate:m_rate];
>@@ -281,6 +308,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::playInternal()
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::pause()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     callOnMainThread([weakThis = createWeakPtr()] {
>         if (!weakThis)
>             return;
>@@ -290,6 +318,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::pause()
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::pauseInternal()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     m_playing = false;
>     [m_synchronizer setRate:0];
> }
>@@ -301,6 +330,7 @@ bool MediaPlayerPrivateMediaSourceAVFObjC::paused() const
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::setVolume(float volume)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, volume);
>     for (const auto& key : m_sampleBufferAudioRendererMap.keys())
>         [(__bridge AVSampleBufferAudioRenderer *)key.get() setVolume:volume];
> }
>@@ -312,6 +342,7 @@ bool MediaPlayerPrivateMediaSourceAVFObjC::supportsScanning() const
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::setMuted(bool muted)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, muted);
>     for (const auto& key : m_sampleBufferAudioRendererMap.keys())
>         [(__bridge AVSampleBufferAudioRenderer *)key.get() setMuted:muted];
> }
>@@ -337,9 +368,15 @@ bool MediaPlayerPrivateMediaSourceAVFObjC::hasAudio() const
>     return m_mediaSourcePrivate->hasAudio();
> }
> 
>-void MediaPlayerPrivateMediaSourceAVFObjC::setVisible(bool)
>+void MediaPlayerPrivateMediaSourceAVFObjC::setVisible(bool visible)
> {
>-    acceleratedRenderingStateChanged();
>+    if (m_visible == visible)
>+        return;
>+
>+    ALWAYS_LOG(LOGIDENTIFIER, visible);
>+    m_visible = visible;
>+    if (m_visible)
>+        acceleratedRenderingStateChanged();
> }
> 
> MediaTime MediaPlayerPrivateMediaSourceAVFObjC::durationMediaTime() const
>@@ -369,7 +406,8 @@ MediaTime MediaPlayerPrivateMediaSourceAVFObjC::initialTime() const
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::seekWithTolerance(const MediaTime& time, const MediaTime& negativeThreshold, const MediaTime& positiveThreshold)
> {
>-    LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::seekWithTolerance(%p) - time(%s), negativeThreshold(%s), positiveThreshold(%s)", this, toString(time).utf8().data(), toString(negativeThreshold).utf8().data(), toString(positiveThreshold).utf8().data());
>+    DEBUG_LOG(LOGIDENTIFIER, "time = ", time, ", negativeThreshold = ", negativeThreshold, ", positiveThreshold = ", positiveThreshold);
>+
>     m_seeking = true;
>     auto weakThis = createWeakPtr();
>     m_pendingSeek = std::make_unique<PendingSeek>(time, negativeThreshold, positiveThreshold);
>@@ -399,7 +437,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::seekInternal()
>         m_lastSeekTime = MediaTime::createWithDouble(m_lastSeekTime.toDouble(), MediaTime::DefaultTimeScale);
> 
>     MediaTime synchronizerTime = PAL::toMediaTime(CMTimebaseGetTime([m_synchronizer timebase]));
>-    LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::seekInternal(%p) - seekTime(%s), synchronizerTime(%s)", this, toString(m_lastSeekTime).utf8().data(), toString(synchronizerTime).utf8().data());
>+    DEBUG_LOG(LOGIDENTIFIER, "seekTime = ", m_lastSeekTime, ", synchronizerTime = ", synchronizerTime);
> 
>     bool doesNotRequireSeek = synchronizerTime == m_lastSeekTime;
> 
>@@ -424,7 +462,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::waitForSeekCompleted()
> {
>     if (!m_seeking)
>         return;
>-    LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::waitForSeekCompleted(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     m_seekCompleted = Seeking;
> }
> 
>@@ -433,10 +471,11 @@ void MediaPlayerPrivateMediaSourceAVFObjC::seekCompleted()
>     if (m_seekCompleted == SeekCompleted)
>         return;
>     if (hasVideo() && !m_hasAvailableVideoFrame) {
>+        ALWAYS_LOG(LOGIDENTIFIER, "waiting for video frame");
>         m_seekCompleted = WaitingForAvailableFame;
>         return;
>     }
>-    LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::seekCompleted(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     m_seekCompleted = SeekCompleted;
>     if (shouldBePlaying())
>         [m_synchronizer setRate:m_rate];
>@@ -459,6 +498,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setRateDouble(double rate)
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::setPreservesPitch(bool preservesPitch)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, preservesPitch);
>     NSString *algorithm = preservesPitch ? AVAudioTimePitchAlgorithmSpectral : AVAudioTimePitchAlgorithmVarispeed;
>     for (const auto& key : m_sampleBufferAudioRendererMap.keys())
>         [(__bridge AVSampleBufferAudioRenderer *)key.get() setAudioTimePitchAlgorithm:algorithm];
>@@ -745,6 +785,8 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setHasAvailableVideoFrame(bool flag)
> {
>     if (m_hasAvailableVideoFrame == flag)
>         return;
>+
>+    DEBUG_LOG(LOGIDENTIFIER, flag);
>     m_hasAvailableVideoFrame = flag;
>     updateAllRenderersHaveAvailableSamples();
> 
>@@ -772,6 +814,7 @@ ALLOW_NEW_API_WITHOUT_GUARDS_END
>     auto& properties = iter->value;
>     if (properties.hasAudibleSample == flag)
>         return;
>+    DEBUG_LOG(LOGIDENTIFIER, flag);
>     properties.hasAudibleSample = flag;
>     updateAllRenderersHaveAvailableSamples();
> }
>@@ -797,6 +840,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::updateAllRenderersHaveAvailableSample
>     if (m_allRenderersHaveAvailableSamples == allRenderersHaveAvailableSamples)
>         return;
> 
>+    DEBUG_LOG(LOGIDENTIFIER, allRenderersHaveAvailableSamples);
>     m_allRenderersHaveAvailableSamples = allRenderersHaveAvailableSamples;
> 
>     if (shouldBePlaying() && [m_synchronizer rate] != m_rate)
>@@ -819,18 +863,20 @@ void MediaPlayerPrivateMediaSourceAVFObjC::durationChanged()
>     auto weakThis = createWeakPtr();
>     NSArray* times = @[[NSValue valueWithCMTime:PAL::toCMTime(duration)]];
> 
>-    LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::durationChanged(%p) - duration = %s", this, toString(duration).utf8().data());
>+    auto logSiteIdentifier = LOGIDENTIFIER;
>+    DEBUG_LOG(logSiteIdentifier, duration);
>+    UNUSED_PARAM(logSiteIdentifier);
> 
>-    m_durationObserver = [m_synchronizer addBoundaryTimeObserverForTimes:times queue:dispatch_get_main_queue() usingBlock:[weakThis, duration] {
>+    m_durationObserver = [m_synchronizer addBoundaryTimeObserverForTimes:times queue:dispatch_get_main_queue() usingBlock:[weakThis, duration, logSiteIdentifier, this] {
>         if (!weakThis)
>             return;
> 
>         MediaTime now = weakThis->currentMediaTime();
>-        LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::durationChanged(%p) - boundary time observer called, now = %s", weakThis.get(), toString(now).utf8().data());
>+        DEBUG_LOG(logSiteIdentifier, "boundary time observer called, now = ", now);
> 
>         weakThis->pauseInternal();
>         if (now < duration) {
>-            LOG(MediaSource, "MediaPlayerPrivateMediaSourceAVFObjC::durationChanged(%p) ERROR: boundary time observer called before duration!", weakThis.get());
>+            ERROR_LOG(logSiteIdentifier, "ERROR: boundary time observer called before duration");
>             [weakThis->m_synchronizer setRate:0 time:PAL::toCMTime(duration)];
>         }
>         weakThis->m_player->timeChanged();
>@@ -872,6 +918,8 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setNaturalSize(const FloatSize& size)
>     if (size == m_naturalSize)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, size);
>+
>     m_naturalSize = size;
>     m_player->sizeChanged();
> }
>@@ -912,6 +960,8 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setCDMSession(LegacyCDMSession* sessi
>     if (session == m_session)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     m_session = makeWeakPtr(toCDMSessionMediaSourceAVFObjC(session));
> 
>     if (CDMSessionAVStreamSession* cdmStreamSession = toCDMSessionAVStreamSession(m_session.get()))
>@@ -931,6 +981,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::keyNeeded(Uint8Array* initData)
> void MediaPlayerPrivateMediaSourceAVFObjC::outputObscuredDueToInsufficientExternalProtectionChanged(bool obscured)
> {
> #if ENABLE(ENCRYPTED_MEDIA)
>+    ALWAYS_LOG(LOGIDENTIFIER, obscured);
>     if (m_mediaSourcePrivate)
>         m_mediaSourcePrivate->outputObscuredDueToInsufficientExternalProtectionChanged(obscured);
> #else
>@@ -941,18 +992,21 @@ void MediaPlayerPrivateMediaSourceAVFObjC::outputObscuredDueToInsufficientExtern
> #if ENABLE(ENCRYPTED_MEDIA)
> void MediaPlayerPrivateMediaSourceAVFObjC::cdmInstanceAttached(CDMInstance& instance)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     if (m_mediaSourcePrivate)
>         m_mediaSourcePrivate->cdmInstanceAttached(instance);
> }
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::cdmInstanceDetached(CDMInstance& instance)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     if (m_mediaSourcePrivate)
>         m_mediaSourcePrivate->cdmInstanceDetached(instance);
> }
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::attemptToDecryptWithInstance(CDMInstance& instance)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     if (m_mediaSourcePrivate)
>         m_mediaSourcePrivate->attemptToDecryptWithInstance(instance);
> }
>@@ -964,11 +1018,13 @@ bool MediaPlayerPrivateMediaSourceAVFObjC::waitingForKey() const
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::waitingForKeyChanged()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     m_player->waitingForKeyChanged();
> }
> 
> void MediaPlayerPrivateMediaSourceAVFObjC::initializationDataEncountered(const String& initDataType, RefPtr<ArrayBuffer>&& initData)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, initDataType);
>     m_player->initializationDataEncountered(initDataType, WTFMove(initData));
> }
> #endif
>@@ -988,6 +1044,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setReadyState(MediaPlayer::ReadyState
>     if (m_readyState == readyState)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, readyState);
>     m_readyState = readyState;
> 
>     if (shouldBePlaying())
>@@ -1008,6 +1065,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setNetworkState(MediaPlayer::NetworkS
>     if (m_networkState == networkState)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, networkState);
>     m_networkState = networkState;
>     m_player->networkStateChanged();
> }
>@@ -1087,6 +1145,7 @@ void MediaPlayerPrivateMediaSourceAVFObjC::setShouldPlayToPlaybackTarget(bool sh
>     if (shouldPlayToTarget == m_shouldPlayToTarget)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER, shouldPlayToTarget);
>     m_shouldPlayToTarget = shouldPlayToTarget;
> 
>     if (m_player)
>@@ -1098,7 +1157,9 @@ bool MediaPlayerPrivateMediaSourceAVFObjC::isCurrentPlaybackTargetWireless() con
>     if (!m_playbackTarget)
>         return false;
> 
>-    return m_shouldPlayToTarget && m_playbackTarget->hasActiveRoute();
>+    auto hasTarget = m_shouldPlayToTarget && m_playbackTarget->hasActiveRoute();
>+    DEBUG_LOG(LOGIDENTIFIER, hasTarget);
>+    return hasTarget;
> }
> #endif
> 
>@@ -1115,6 +1176,13 @@ bool MediaPlayerPrivateMediaSourceAVFObjC::performTaskAtMediaTime(WTF::Function<
>     return true;
> }
> 
>+#if !RELEASE_LOG_DISABLED
>+WTFLogChannel& MediaPlayerPrivateMediaSourceAVFObjC::logChannel() const
>+{
>+    return LogMediaSource;
>+}
>+#endif
>+
> }
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaStreamAVFObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaStreamAVFObjC.mm
>index 935b1bfc236e95af6d061baffb49cf2c4e7a540f..aee746522b6b69b3a7997c5c662734ca58c67136 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaStreamAVFObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaStreamAVFObjC.mm
>@@ -381,9 +381,9 @@ void MediaPlayerPrivateMediaStreamAVFObjC::enqueueVideoSample(MediaStreamTrackPr
>         INFO_LOG(LOGIDENTIFIER, "timeline offset for track ", track.id(), " set to ", timelineOffset);
>     }
> 
>-    DEBUG_LOG(LOGIDENTIFIER, "original sample = ", toString(sample));
>+    DEBUG_LOG(LOGIDENTIFIER, "original sample = ", sample);
>     sample.offsetTimestampsBy(timelineOffset);
>-    DEBUG_LOG(LOGIDENTIFIER, "updated sample = ", toString(sample));
>+    DEBUG_LOG(LOGIDENTIFIER, "updated sample = ", sample);
> 
>     if (WILL_LOG(WTFLogLevelDebug)) {
>         MediaTime now = streamTime();
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.h b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.h
>index 966ccd5569f9e06b6f9a581997aa7b389d1dd230..06eb4684d891cb4dd06c7173e7fe86536a2d90a5 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.h
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.h
>@@ -68,6 +68,8 @@ public:
> 
>     CMSampleBufferRef sampleBuffer() const { return m_sample.get(); }
> 
>+    String toJSONString() const override;
>+
> protected:
>     MediaSampleAVFObjC(RetainPtr<CMSampleBufferRef>&& sample)
>         : m_sample(WTFMove(sample))
>@@ -101,4 +103,5 @@ protected:
>     bool m_mirrored { false };
> };
> 
>-}
>+} // namespace WebCore
>+
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.mm
>index 0ef943c4dd2bf43ceaf5ba5fe3345ba28c52b2e6..ffc69d7785772dcad1a49ad7a4a1b07d6cb91eec 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSampleAVFObjC.mm
>@@ -311,4 +311,18 @@ RefPtr<JSC::Uint8ClampedArray> MediaSampleAVFObjC::getRGBAImageData() const
> #endif
> }
> 
>+String MediaSampleAVFObjC::toJSONString() const
>+{
>+    auto object = JSON::Object::create();
>+
>+    object->setObject("pts"_s, presentationTime().toJSONObject());
>+    object->setObject("opts"_s, outputPresentationTime().toJSONObject());
>+    object->setObject("dts"_s, decodeTime().toJSONObject());
>+    object->setObject("duration"_s, duration().toJSONObject());
>+    object->setInteger("flags"_s, static_cast<unsigned>(flags()));
>+    object->setObject("presentationSize"_s, presentationSize().toJSONObject());
>+
>+    return object->toJSONString();
>+}
>+
> }
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.h b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.h
>index 16812759e0a1aefcf48bef1a4364d584c9181dc6..9ff1c04edb50da613f7f696575c4e7adb4efa5f4 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.h
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.h
>@@ -30,6 +30,7 @@
> 
> #include "MediaSourcePrivate.h"
> #include <wtf/Deque.h>
>+#include <wtf/LoggerHelper.h>
> #include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> #include <wtf/Vector.h>
>@@ -51,7 +52,12 @@ class SourceBufferPrivateAVFObjC;
> class TimeRanges;
> class WebCoreDecompressionSession;
> 
>-class MediaSourcePrivateAVFObjC final : public MediaSourcePrivate {
>+class MediaSourcePrivateAVFObjC final
>+    : public MediaSourcePrivate
>+#if !RELEASE_LOG_DISABLED
>+    , private LoggerHelper
>+#endif
>+{
> public:
>     static Ref<MediaSourcePrivateAVFObjC> create(MediaPlayerPrivateMediaSourceAVFObjC*, MediaSourcePrivateClient*);
>     virtual ~MediaSourcePrivateAVFObjC();
>@@ -95,6 +101,15 @@ public:
>     void outputObscuredDueToInsufficientExternalProtectionChanged(bool);
> #endif
> 
>+#if !RELEASE_LOG_DISABLED
>+    const Logger& logger() const final { return m_logger.get(); }
>+    const char* logClassName() const override { return "MediaSourcePrivateAVFObjC"; }
>+    const void* logIdentifier() const final { return m_logIdentifier; }
>+    WTFLogChannel& logChannel() const final;
>+
>+    const void* nextSourceBufferLogIdentifier() { return childLogIdentifier(++m_nextSourceBufferID); }
>+#endif
>+
> private:
>     MediaSourcePrivateAVFObjC(MediaPlayerPrivateMediaSourceAVFObjC*, MediaSourcePrivateClient*);
> 
>@@ -120,6 +135,11 @@ private:
> #if ENABLE(ENCRYPTED_MEDIA)
>     RefPtr<CDMInstance> m_cdmInstance;
> #endif
>+#if !RELEASE_LOG_DISABLED
>+    Ref<const Logger> m_logger;
>+    const void* m_logIdentifier;
>+    uint64_t m_nextSourceBufferID { 0 };
>+#endif
> };
> 
> }
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.mm
>index 2b37ec7dfeab465f11f7a507e08892ed97890a02..163297b5ebf315b5bb0a4dac0f85df060a521bde 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaSourcePrivateAVFObjC.mm
>@@ -31,6 +31,7 @@
> #import "CDMInstance.h"
> #import "CDMSessionMediaSourceAVFObjC.h"
> #import "ContentType.h"
>+#import "Logging.h"
> #import "MediaPlayerPrivateMediaSourceAVFObjC.h"
> #import "MediaSourcePrivateClient.h"
> #import "SourceBufferPrivateAVFObjC.h"
>@@ -55,17 +56,29 @@ MediaSourcePrivateAVFObjC::MediaSourcePrivateAVFObjC(MediaPlayerPrivateMediaSour
>     : m_player(parent)
>     , m_client(client)
>     , m_isEnded(false)
>+#if !RELEASE_LOG_DISABLED
>+    , m_logger(m_player->mediaPlayerLogger())
>+    , m_logIdentifier(m_player->mediaPlayerLogIdentifier())
>+#endif
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+#if !RELEASE_LOG_DISABLED
>+    m_client->setLogIdentifier(m_logIdentifier);
>+#endif
> }
> 
> MediaSourcePrivateAVFObjC::~MediaSourcePrivateAVFObjC()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     for (auto it = m_sourceBuffers.begin(), end = m_sourceBuffers.end(); it != end; ++it)
>         (*it)->clearMediaSource();
> }
> 
> MediaSourcePrivate::AddStatus MediaSourcePrivateAVFObjC::addSourceBuffer(const ContentType& contentType, RefPtr<SourceBufferPrivate>& outPrivate)
> {
>+    DEBUG_LOG(LOGIDENTIFIER, contentType);
>+
>     MediaEngineSupportParameters parameters;
>     parameters.isMediaSource = true;
>     parameters.type = contentType;
>@@ -305,6 +318,13 @@ void MediaSourcePrivateAVFObjC::setSourceBufferWithSelectedVideo(SourceBufferPri
>     }
> }
> 
>+#if !RELEASE_LOG_DISABLED
>+WTFLogChannel& MediaSourcePrivateAVFObjC::logChannel() const
>+{
>+    return LogMediaSource;
>+}
>+#endif
>+
> }
> 
> #endif // ENABLE(MEDIA_SOURCE) && USE(AVFOUNDATION)
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.h b/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.h
>index f9866e02f976a931cb41ff800542d278530c894e..99653b4f6eab2c0adf933fd2ab33b2710ca63aca 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.h
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.h
>@@ -32,6 +32,7 @@
> #include <wtf/Box.h>
> #include <wtf/Deque.h>
> #include <wtf/HashMap.h>
>+#include <wtf/LoggerHelper.h>
> #include <wtf/MediaTime.h>
> #include <wtf/OSObjectPtr.h>
> #include <wtf/RefPtr.h>
>@@ -77,7 +78,13 @@ public:
>     ALLOW_NEW_API_WITHOUT_GUARDS_END
> };
> 
>-class SourceBufferPrivateAVFObjC final : public SourceBufferPrivate, public CanMakeWeakPtr<SourceBufferPrivateAVFObjC> {
>+class SourceBufferPrivateAVFObjC final
>+    : public SourceBufferPrivate
>+    , public CanMakeWeakPtr<SourceBufferPrivateAVFObjC>
>+#if !RELEASE_LOG_DISABLED
>+    , private LoggerHelper
>+#endif
>+{
> public:
>     static Ref<SourceBufferPrivateAVFObjC> create(MediaSourcePrivateAVFObjC*);
>     virtual ~SourceBufferPrivateAVFObjC();
>@@ -127,6 +134,15 @@ public:
> 
>     void bufferWasConsumed();
> 
>+#if !RELEASE_LOG_DISABLED
>+    const Logger& logger() const final { return m_logger.get(); }
>+    const char* logClassName() const override { return "SourceBufferPrivateAVFObjC"; }
>+    const void* logIdentifier() const final { return m_logIdentifier; }
>+    WTFLogChannel& logChannel() const final;
>+    const Logger* sourceBufferLogger() const final { return &m_logger.get(); }
>+    const void* sourceBufferLogIdentifier() final { return logIdentifier(); }
>+#endif
>+
> private:
>     explicit SourceBufferPrivateAVFObjC(MediaSourcePrivateAVFObjC*);
> 
>@@ -196,6 +212,11 @@ private:
>     int m_enabledVideoTrackID { -1 };
>     int m_protectedTrackID { -1 };
>     uint64_t m_mapID;
>+
>+#if !RELEASE_LOG_DISABLED
>+    Ref<const Logger> m_logger;
>+    const void* m_logIdentifier;
>+#endif
> };
> 
> }
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm
>index 11afe9f0eefb64c5e072580436fe53204889dfb7..23d9b2f48d8d8fda9f93f5d8f7b8ff72a729cc4d 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm
>@@ -456,8 +456,6 @@ static uint64_t nextMapID()
> 
> static void bufferWasConsumedCallback(CMNotificationCenterRef, const void* listener, CFStringRef notificationName, const void*, CFTypeRef)
> {
>-    LOG(MediaSource, "bufferWasConsumedCallback - nofication %s", [(__bridge NSString *)notificationName UTF8String]);
>-
>     if (!CFEqual(kCMSampleBufferConsumerNotification_BufferConsumed, notificationName))
>         return;
> 
>@@ -470,7 +468,7 @@ static void bufferWasConsumedCallback(CMNotificationCenterRef, const void* liste
> 
>     uint64_t mapID = reinterpret_cast<uint64_t>(listener);
>     if (!mapID) {
>-        LOG(MediaSource, "bufferWasConsumedCallback - ERROR: didn't find ID %llu in map", mapID);
>+        RELEASE_LOG(MediaSource, "bufferWasConsumedCallback - ERROR: didn't find ID %llu in map", mapID);
>         return;
>     }
> 
>@@ -490,7 +488,13 @@ SourceBufferPrivateAVFObjC::SourceBufferPrivateAVFObjC(MediaSourcePrivateAVFObjC
>     , m_isAppendingGroup(adoptOSObject(dispatch_group_create()))
>     , m_mediaSource(parent)
>     , m_mapID(nextMapID())
>+#if !RELEASE_LOG_DISABLED
>+    , m_logger(parent->logger())
>+    , m_logIdentifier(parent->nextSourceBufferLogIdentifier())
>+#endif
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     CMNotificationCenterAddListener(CMNotificationCenterGetDefaultLocalCenter(), reinterpret_cast<void*>(m_mapID), bufferWasConsumedCallback, kCMSampleBufferConsumerNotification_BufferConsumed, nullptr, 0);
>     m_delegate.get().abortSemaphore = Box<Semaphore>::create(0);
> 
>@@ -499,6 +503,8 @@ SourceBufferPrivateAVFObjC::SourceBufferPrivateAVFObjC(MediaSourcePrivateAVFObjC
> 
> SourceBufferPrivateAVFObjC::~SourceBufferPrivateAVFObjC()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     ASSERT(!m_client);
>     sourceBufferMap().remove(m_mapID);
>     destroyParser();
>@@ -512,7 +518,7 @@ SourceBufferPrivateAVFObjC::~SourceBufferPrivateAVFObjC()
> 
> void SourceBufferPrivateAVFObjC::didParseStreamDataAsAsset(AVAsset* asset)
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::didParseStreamDataAsAsset(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
> 
>     if (!m_mediaSource)
>         return;
>@@ -578,7 +584,7 @@ void SourceBufferPrivateAVFObjC::didFailToParseStreamDataWithError(NSError *erro
> #if LOG_DISABLED
>     UNUSED_PARAM(error);
> #endif
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::didFailToParseStreamDataWithError(%p) - error:\"%s\"", this, String([error description]).utf8().data());
>+    ERROR_LOG(LOGIDENTIFIER, [[error description] UTF8String]);
> 
>     m_parsingSucceeded = false;
> }
>@@ -607,7 +613,7 @@ bool SourceBufferPrivateAVFObjC::processCodedFrame(int trackID, CMSampleBufferRe
> 
>     if (m_client) {
>         Ref<MediaSample> mediaSample = MediaSampleAVFObjC::create(sampleBuffer, trackID);
>-        LOG(MediaSourceSamples, "SourceBufferPrivateAVFObjC::processCodedFrame(%p) - sample(%s)", this, toString(mediaSample.get()).utf8().data());
>+        DEBUG_LOG(LOGIDENTIFIER, mediaSample.get());
>         m_client->sourceBufferPrivateDidReceiveSample(mediaSample);
>     }
> 
>@@ -627,7 +633,8 @@ void SourceBufferPrivateAVFObjC::willProvideContentKeyRequestInitializationDataF
>     ASSERT(m_parser);
> 
> #if HAVE(AVSTREAMSESSION) && ENABLE(LEGACY_ENCRYPTED_MEDIA)
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::willProvideContentKeyRequestInitializationDataForTrackID(%p) - track:%d", this, trackID);
>+    ALWAYS_LOG(LOGIDENTIFIER, "track = ", trackID);
>+
>     m_protectedTrackID = trackID;
> 
>     if (CDMSessionMediaSourceAVFObjC* session = m_mediaSource->player()->cdmSession())
>@@ -648,7 +655,8 @@ void SourceBufferPrivateAVFObjC::didProvideContentKeyRequestInitializationDataFo
>         return;
> 
> #if HAVE(AVSTREAMSESSION) && ENABLE(LEGACY_ENCRYPTED_MEDIA)
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::didProvideContentKeyRequestInitializationDataForTrackID(%p) - track:%d", this, trackID);
>+    ALWAYS_LOG(LOGIDENTIFIER, "track = ", trackID);
>+
>     m_protectedTrackID = trackID;
>     auto initDataArray = Uint8Array::create([initData length]);
>     [initData getBytes:initDataArray->data() length:initDataArray->length()];
>@@ -710,7 +718,7 @@ static dispatch_queue_t globalDataParserQueue()
> 
> void SourceBufferPrivateAVFObjC::append(Vector<unsigned char>&& data)
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::append(%p) - data:%p, length:%d", this, data.data(), (int)data.size());
>+    DEBUG_LOG(LOGIDENTIFIER, "data length = ", data.size());
> 
>     // FIXME: Avoid the data copy by wrapping around the Vector<> object.
>     RetainPtr<NSData> nsData = adoptNS([[NSData alloc] initWithBytes:data.data() length:data.size()]);
>@@ -747,6 +755,8 @@ void SourceBufferPrivateAVFObjC::appendCompleted()
> 
> void SourceBufferPrivateAVFObjC::abort()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     // The parsing queue may be blocked waiting for the main thread to provide it a AVStreamSession. We
>     // were asked to abort, and that cancels all outstanding append operations. Without cancelling this
>     // semaphore, the m_isAppendingGroup wait operation will deadlock.
>@@ -761,7 +771,8 @@ void SourceBufferPrivateAVFObjC::abort()
> 
> void SourceBufferPrivateAVFObjC::resetParserState()
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::resetParserState(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     m_parserStateWasReset = true;
>     m_discardSamplesUntilNextInitializationSegment = true;
> }
>@@ -808,6 +819,8 @@ void SourceBufferPrivateAVFObjC::destroyRenderers()
> 
> void SourceBufferPrivateAVFObjC::removedFromMediaSource()
> {
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     destroyParser();
>     destroyRenderers();
> 
>@@ -822,7 +835,7 @@ MediaPlayer::ReadyState SourceBufferPrivateAVFObjC::readyState() const
> 
> void SourceBufferPrivateAVFObjC::setReadyState(MediaPlayer::ReadyState readyState)
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::setReadyState(%p) - readyState = %i", this, (int)readyState);
>+    ALWAYS_LOG(LOGIDENTIFIER, readyState);
> 
>     if (m_mediaSource)
>         m_mediaSource->player()->setReadyState(readyState);
>@@ -847,7 +860,7 @@ void SourceBufferPrivateAVFObjC::trackDidChangeEnabled(VideoTrackPrivateMediaSou
> {
>     int trackID = track->trackID();
> 
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::trackDidChangeEnabled(%p) - video trackID = %i, selected = %s", this, trackID, track->selected() ? "true" : "false");
>+    ALWAYS_LOG(LOGIDENTIFIER, "video trackID = ", trackID, ", selected = ", track->selected());
> 
>     if (!track->selected() && m_enabledVideoTrackID == trackID) {
>         m_enabledVideoTrackID = -1;
>@@ -873,7 +886,7 @@ void SourceBufferPrivateAVFObjC::trackDidChangeEnabled(AudioTrackPrivateMediaSou
> {
>     int trackID = track->trackID();
> 
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::trackDidChangeEnabled(%p) - audio trackID = %i, enabled = %s", this, trackID, track->enabled() ? "true" : "false");
>+    ALWAYS_LOG(LOGIDENTIFIER, "audio trackID = ", trackID, ", selected = ", track->enabled());
> 
>     if (!track->enabled()) {
>         ALLOW_NEW_API_WITHOUT_GUARDS_BEGIN
>@@ -910,6 +923,8 @@ void SourceBufferPrivateAVFObjC::setCDMSession(CDMSessionMediaSourceAVFObjC* ses
>     if (session == m_session)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     if (m_session)
>         m_session->removeSourceBuffer(this);
> 
>@@ -945,6 +960,8 @@ void SourceBufferPrivateAVFObjC::setCDMInstance(CDMInstance* instance)
>     if (fpsInstance == m_cdmInstance)
>         return;
> 
>+    ALWAYS_LOG(LOGIDENTIFIER);
>+
>     m_cdmInstance = fpsInstance;
>     attemptToDecrypt();
> #else
>@@ -993,7 +1010,7 @@ void SourceBufferPrivateAVFObjC::unregisterForErrorNotifications(SourceBufferPri
> 
> void SourceBufferPrivateAVFObjC::layerDidReceiveError(AVSampleBufferDisplayLayer *layer, NSError *error)
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::layerDidReceiveError(%p): layer(%p), error(%s)", this, layer, [[error description] UTF8String]);
>+    ERROR_LOG(LOGIDENTIFIER, [[error description] UTF8String]);
> 
>     // FIXME(142246): Remove the following once <rdar://problem/20027434> is resolved.
>     bool anyIgnored = false;
>@@ -1022,6 +1039,8 @@ void SourceBufferPrivateAVFObjC::outputObscuredDueToInsufficientExternalProtecti
>     UNUSED_PARAM(obscured);
> #endif
> 
>+    ERROR_LOG(LOGIDENTIFIER, obscured);
>+
>     RetainPtr<NSError> error = [NSError errorWithDomain:@"com.apple.WebKit" code:'HDCP' userInfo:nil];
>     layerDidReceiveError(m_displayLayer.get(), error.get());
> }
>@@ -1030,7 +1049,7 @@ ALLOW_NEW_API_WITHOUT_GUARDS_BEGIN
> void SourceBufferPrivateAVFObjC::rendererDidReceiveError(AVSampleBufferAudioRenderer *renderer, NSError *error)
> ALLOW_NEW_API_WITHOUT_GUARDS_END
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::rendererDidReceiveError(%p): renderer(%p), error(%s)", this, renderer, [[error description] UTF8String]);
>+    ERROR_LOG(LOGIDENTIFIER, [[error description] UTF8String]);
> 
>     if ([error code] == 'HDCP')
>         m_hdcpError = error;
>@@ -1049,7 +1068,7 @@ ALLOW_NEW_API_WITHOUT_GUARDS_END
> void SourceBufferPrivateAVFObjC::flush(const AtomicString& trackIDString)
> {
>     int trackID = trackIDString.toInt();
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::flush(%p) - trackId: %d", this, trackID);
>+    DEBUG_LOG(LOGIDENTIFIER, trackID);
> 
>     if (trackID == m_enabledVideoTrackID) {
>         flushVideo();
>@@ -1059,6 +1078,7 @@ void SourceBufferPrivateAVFObjC::flush(const AtomicString& trackIDString)
> 
> void SourceBufferPrivateAVFObjC::flushVideo()
> {
>+    DEBUG_LOG(LOGIDENTIFIER);
>     [m_displayLayer flush];
> 
>     if (m_decompressionSession) {
>@@ -1097,13 +1117,13 @@ void SourceBufferPrivateAVFObjC::enqueueSample(Ref<MediaSample>&& sample, const
>     if (platformSample.type != PlatformSample::CMSampleBufferType)
>         return;
> 
>-    LOG(MediaSourceSamples, "SourceBufferPrivateAVFObjC::enqueueSample(%p) - sample(%s)", this, toString(sample.get()).utf8().data());
>+    DEBUG_LOG(LOGIDENTIFIER, "track ID = ", trackID, "sample = ", sample.get());
> 
>     if (trackID == m_enabledVideoTrackID) {
>         CMFormatDescriptionRef formatDescription = CMSampleBufferGetFormatDescription(platformSample.sample.cmSampleBuffer);
>         FloatSize formatSize = FloatSize(CMVideoFormatDescriptionGetPresentationDimensions(formatDescription, true, true));
>         if (!m_cachedSize || formatSize != m_cachedSize.value()) {
>-            LOG(MediaSource, "SourceBufferPrivateAVFObjC::enqueueSample(%p) - size change detected: {width=%lf, height=%lf}", this, formatSize.width(), formatSize.height());
>+            DEBUG_LOG(LOGIDENTIFIER, "size changed to ", formatSize);
>             bool sizeWasNull = !m_cachedSize;
>             m_cachedSize = formatSize;
>             if (m_mediaSource) {
>@@ -1121,7 +1141,7 @@ void SourceBufferPrivateAVFObjC::enqueueSample(Ref<MediaSample>&& sample, const
>             return;
> 
>         if (m_mediaSource && !m_mediaSource->player()->hasAvailableVideoFrame() && !sample->isNonDisplaying()) {
>-            LOG(MediaSource, "SourceBufferPrivateAVFObjC::didParseStreamDataAsAsset(%p) - adding buffer attachment", this);
>+            DEBUG_LOG(LOGIDENTIFIER, "adding buffer attachment");
> 
>             CMSampleBufferRef rawSampleCopy;
>             CMSampleBufferCreateCopy(kCFAllocatorDefault, platformSample.sample.cmSampleBuffer, &rawSampleCopy);
>@@ -1144,7 +1164,7 @@ void SourceBufferPrivateAVFObjC::enqueueSample(Ref<MediaSample>&& sample, const
> 
> void SourceBufferPrivateAVFObjC::bufferWasConsumed()
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::bufferWasConsumed(%p)", this);
>+    DEBUG_LOG(LOGIDENTIFIER);
> 
>     if (m_mediaSource)
>         m_mediaSource->player()->setHasAvailableVideoFrame(true);
>@@ -1168,6 +1188,7 @@ bool SourceBufferPrivateAVFObjC::isReadyForMoreSamples(const AtomicString& track
> 
> void SourceBufferPrivateAVFObjC::setActive(bool isActive)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, isActive);
>     if (m_mediaSource)
>         m_mediaSource->sourceBufferPrivateDidChangeActiveState(this, isActive);
> }
>@@ -1181,7 +1202,7 @@ MediaTime SourceBufferPrivateAVFObjC::fastSeekTimeForMediaTime(const MediaTime&
> 
> void SourceBufferPrivateAVFObjC::willSeek()
> {
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::willSeek(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
>     flush();
> }
> 
>@@ -1192,7 +1213,8 @@ FloatSize SourceBufferPrivateAVFObjC::naturalSize()
> 
> void SourceBufferPrivateAVFObjC::didBecomeReadyForMoreSamples(int trackID)
> {
>-    LOG(Media, "SourceBufferPrivateAVFObjC::didBecomeReadyForMoreSamples(%p) - track(%d)", this, trackID);
>+    INFO_LOG(LOGIDENTIFIER, trackID);
>+
>     if (trackID == m_enabledVideoTrackID) {
>         if (m_decompressionSession)
>             m_decompressionSession->stopRequestingMediaData();
>@@ -1233,6 +1255,8 @@ void SourceBufferPrivateAVFObjC::notifyClientWhenReadyForMoreSamples(const Atomi
> 
> bool SourceBufferPrivateAVFObjC::canSwitchToType(const ContentType& contentType)
> {
>+    ALWAYS_LOG(LOGIDENTIFIER, contentType);
>+
>     MediaEngineSupportParameters parameters;
>     parameters.isMediaSource = true;
>     parameters.type = contentType;
>@@ -1271,7 +1295,7 @@ void SourceBufferPrivateAVFObjC::setDecompressionSession(WebCoreDecompressionSes
>     if (m_decompressionSession == decompressionSession)
>         return;
> 
>-    LOG(MediaSource, "SourceBufferPrivateAVFObjC::setDecompressionSession(%p)", this);
>+    ALWAYS_LOG(LOGIDENTIFIER);
> 
>     if (m_decompressionSession) {
>         m_decompressionSession->stopRequestingMediaData();
>@@ -1296,6 +1320,13 @@ void SourceBufferPrivateAVFObjC::setDecompressionSession(WebCoreDecompressionSes
>         m_client->sourceBufferPrivateReenqueSamples(AtomicString::number(m_enabledVideoTrackID));
> }
> 
>+#if !RELEASE_LOG_DISABLED
>+WTFLogChannel& SourceBufferPrivateAVFObjC::logChannel() const
>+{
>+    return LogMediaSource;
>+}
>+#endif
>+
> }
> 
> #endif // ENABLE(MEDIA_SOURCE) && USE(AVFOUNDATION)
>diff --git a/Source/WebCore/platform/mock/mediasource/MockMediaPlayerMediaSource.h b/Source/WebCore/platform/mock/mediasource/MockMediaPlayerMediaSource.h
>index b3bf3a19a66f39ba7dc0d6b5c96d67abf8126950..7dfc1f228da21394f376c7f2964cf1446e8ca31e 100644
>--- a/Source/WebCore/platform/mock/mediasource/MockMediaPlayerMediaSource.h
>+++ b/Source/WebCore/platform/mock/mediasource/MockMediaPlayerMediaSource.h
>@@ -29,6 +29,7 @@
> #if ENABLE(MEDIA_SOURCE)
> 
> #include "MediaPlayerPrivate.h"
>+#include <wtf/Logger.h>
> #include <wtf/MediaTime.h>
> 
> namespace WebCore {
>@@ -56,6 +57,11 @@ public:
>     void waitForSeekCompleted();
>     void seekCompleted();
> 
>+#if !RELEASE_LOG_DISABLED
>+    const void* mediaPlayerLogIdentifier() { return m_player->mediaPlayerLogIdentifier(); }
>+    const Logger& mediaPlayerLogger() { return m_player->mediaPlayerLogger(); }
>+#endif
>+
> private:
>     // MediaPlayerPrivate Overrides
>     void load(const String& url) override;
>diff --git a/Source/WebCore/platform/mock/mediasource/MockMediaSourcePrivate.cpp b/Source/WebCore/platform/mock/mediasource/MockMediaSourcePrivate.cpp
>index aa42e88a43c19cca285f65eea1e791a05285428e..cbb563b6e9ffe039c7854bef1b8aa8f6371731c1 100644
>--- a/Source/WebCore/platform/mock/mediasource/MockMediaSourcePrivate.cpp
>+++ b/Source/WebCore/platform/mock/mediasource/MockMediaSourcePrivate.cpp
>@@ -46,6 +46,9 @@ MockMediaSourcePrivate::MockMediaSourcePrivate(MockMediaPlayerMediaSource& paren
>     : m_player(parent)
>     , m_client(client)
> {
>+#if !RELEASE_LOG_DISABLED
>+    m_client->setLogIdentifier(m_player.mediaPlayerLogIdentifier());
>+#endif
> }
> 
> MockMediaSourcePrivate::~MockMediaSourcePrivate()

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Attachments on bug 194348: 361338 | 361352 | 361396 | 361407 | 361410 | 361413 | 361415