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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/168519">168519</a></dd>
<dt>Author</dt> <dd>bfulgham@apple.com</dd>
<dt>Date</dt> <dd>2014-05-08 22:20:59 -0700 (Thu, 08 May 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Multiple (stacked) cues when shuttling through video while playing closed captions
https://bugs.webkit.org/show_bug.cgi?id=132715
<rdar://problem/16795782>
Reviewed by Eric Carlson.
Tests: media/track/track-in-band-cues-added-once.html
* html/track/TextTrack.cpp:
(WebCore::TextTrack::hasCue): Revise to use a relaxed time equality.
* html/track/TextTrackCue.cpp:
(WebCore::TextTrackCue::isEqual): Ditto.
(WebCore::TextTrackCue::hasEquivalentStartTime): Added.
* html/track/TextTrackCue.h:
(WebCore::TextTrackCue::startTimeVariance): Added.
* html/track/TextTrackCueGeneric.h:
* html/track/TextTrackCueGeneric.cpp:
(WebCore::TextTrackCueGeneric::isEqual): Do not call the VTTCue::isEqual method from
this class, since cueType() will not equal VTTCue, and the equality will fail.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorehtmltrackTextTrackcpp">trunk/Source/WebCore/html/track/TextTrack.cpp</a></li>
<li><a href="#trunkSourceWebCorehtmltrackTextTrackCuecpp">trunk/Source/WebCore/html/track/TextTrackCue.cpp</a></li>
<li><a href="#trunkSourceWebCorehtmltrackTextTrackCueh">trunk/Source/WebCore/html/track/TextTrackCue.h</a></li>
<li><a href="#trunkSourceWebCorehtmltrackTextTrackCueGenericcpp">trunk/Source/WebCore/html/track/TextTrackCueGeneric.cpp</a></li>
<li><a href="#trunkSourceWebCorehtmltrackTextTrackCueGenerich">trunk/Source/WebCore/html/track/TextTrackCueGeneric.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (168518 => 168519)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-05-09 04:37:25 UTC (rev 168518)
+++ trunk/Source/WebCore/ChangeLog 2014-05-09 05:20:59 UTC (rev 168519)
</span><span class="lines">@@ -1,3 +1,25 @@
</span><ins>+2014-05-08 Brent Fulgham <bfulgham@apple.com>
+
+ Multiple (stacked) cues when shuttling through video while playing closed captions
+ https://bugs.webkit.org/show_bug.cgi?id=132715
+ <rdar://problem/16795782>
+
+ Reviewed by Eric Carlson.
+
+ Tests: media/track/track-in-band-cues-added-once.html
+
+ * html/track/TextTrack.cpp:
+ (WebCore::TextTrack::hasCue): Revise to use a relaxed time equality.
+ * html/track/TextTrackCue.cpp:
+ (WebCore::TextTrackCue::isEqual): Ditto.
+ (WebCore::TextTrackCue::hasEquivalentStartTime): Added.
+ * html/track/TextTrackCue.h:
+ (WebCore::TextTrackCue::startTimeVariance): Added.
+ * html/track/TextTrackCueGeneric.h:
+ * html/track/TextTrackCueGeneric.cpp:
+ (WebCore::TextTrackCueGeneric::isEqual): Do not call the VTTCue::isEqual method from
+ this class, since cueType() will not equal VTTCue, and the equality will fail.
+
</ins><span class="cx"> 2014-05-08 Alexey Proskuryakov <ap@apple.com>
</span><span class="cx">
</span><span class="cx"> Automatically zip document bundles used via File API
</span></span></pre></div>
<a id="trunkSourceWebCorehtmltrackTextTrackcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/html/track/TextTrack.cpp (168518 => 168519)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/html/track/TextTrack.cpp 2014-05-09 04:37:25 UTC (rev 168518)
+++ trunk/Source/WebCore/html/track/TextTrack.cpp 2014-05-09 05:20:59 UTC (rev 168519)
</span><span class="lines">@@ -507,7 +507,7 @@
</span><span class="cx">
</span><span class="cx"> // If there is more than one cue with the same start time, back up to first one so we
</span><span class="cx"> // consider all of them.
</span><del>- while (searchStart >= 2 && cue->startTime() == m_cues->item(searchStart - 2)->startTime())
</del><ins>+ while (searchStart >= 2 && cue->hasEquivalentStartTime(*m_cues->item(searchStart - 2)))
</ins><span class="cx"> --searchStart;
</span><span class="cx">
</span><span class="cx"> bool firstCompare = true;
</span><span class="lines">@@ -519,7 +519,7 @@
</span><span class="cx"> return false;
</span><span class="cx">
</span><span class="cx"> existingCue = m_cues->item(searchStart - 1);
</span><del>- if (!existingCue || cue->startTime() > existingCue->startTime())
</del><ins>+ if (!existingCue || cue->startTime() > (existingCue->startTime() + existingCue->startTimeVariance()))
</ins><span class="cx"> return false;
</span><span class="cx">
</span><span class="cx"> if (!existingCue->isEqual(*cue, match))
</span><span class="lines">@@ -531,7 +531,7 @@
</span><span class="cx">
</span><span class="cx"> size_t index = (searchStart + searchEnd) / 2;
</span><span class="cx"> existingCue = m_cues->item(index);
</span><del>- if (cue->startTime() < existingCue->startTime() || (match != TextTrackCue::IgnoreDuration && cue->startTime() == existingCue->startTime() && cue->endTime() > existingCue->endTime()))
</del><ins>+ if ((cue->startTime() + existingCue->startTimeVariance()) < existingCue->startTime() || (match != TextTrackCue::IgnoreDuration && cue->hasEquivalentStartTime(*existingCue) && cue->endTime() > existingCue->endTime()))
</ins><span class="cx"> searchEnd = index;
</span><span class="cx"> else
</span><span class="cx"> searchStart = index + 1;
</span></span></pre></div>
<a id="trunkSourceWebCorehtmltrackTextTrackCuecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/html/track/TextTrackCue.cpp (168518 => 168519)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/html/track/TextTrackCue.cpp 2014-05-09 04:37:25 UTC (rev 168518)
+++ trunk/Source/WebCore/html/track/TextTrackCue.cpp 2014-05-09 05:20:59 UTC (rev 168519)
</span><span class="lines">@@ -209,7 +209,7 @@
</span><span class="cx">
</span><span class="cx"> if (match != IgnoreDuration && endTime() != cue.endTime())
</span><span class="cx"> return false;
</span><del>- if (startTime() != cue.startTime())
</del><ins>+ if (!hasEquivalentStartTime(cue))
</ins><span class="cx"> return false;
</span><span class="cx"> if (id() != cue.id())
</span><span class="cx"> return false;
</span><span class="lines">@@ -217,6 +217,11 @@
</span><span class="cx"> return true;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+bool TextTrackCue::hasEquivalentStartTime(const TextTrackCue& cue) const
+{
+ return std::abs(std::abs(startTime()) - std::abs(cue.startTime())) < startTimeVariance();
+}
+
</ins><span class="cx"> } // namespace WebCore
</span><span class="cx">
</span><span class="cx"> #endif
</span></span></pre></div>
<a id="trunkSourceWebCorehtmltrackTextTrackCueh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/html/track/TextTrackCue.h (168518 => 168519)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/html/track/TextTrackCue.h 2014-05-09 04:37:25 UTC (rev 168518)
+++ trunk/Source/WebCore/html/track/TextTrackCue.h 2014-05-09 05:20:59 UTC (rev 168519)
</span><span class="lines">@@ -1,6 +1,6 @@
</span><span class="cx"> /*
</span><span class="cx"> * Copyright (C) 2011 Google Inc. All rights reserved.
</span><del>- * Copyright (C) 2012, 2013 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2012, 2013, 2014 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions are
</span><span class="lines">@@ -83,6 +83,9 @@
</span><span class="cx">
</span><span class="cx"> virtual bool isOrderedBefore(const TextTrackCue*) const;
</span><span class="cx">
</span><ins>+ bool hasEquivalentStartTime(const TextTrackCue&) const;
+ virtual double startTimeVariance() const { return 0; }
+
</ins><span class="cx"> enum CueType {
</span><span class="cx"> Data,
</span><span class="cx"> Generic,
</span></span></pre></div>
<a id="trunkSourceWebCorehtmltrackTextTrackCueGenericcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/html/track/TextTrackCueGeneric.cpp (168518 => 168519)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/html/track/TextTrackCueGeneric.cpp 2014-05-09 04:37:25 UTC (rev 168518)
+++ trunk/Source/WebCore/html/track/TextTrackCueGeneric.cpp 2014-05-09 05:20:59 UTC (rev 168519)
</span><span class="lines">@@ -153,6 +153,8 @@
</span><span class="cx">
</span><span class="cx"> bool TextTrackCueGeneric::isEqual(const TextTrackCue& cue, TextTrackCue::CueMatchRules match) const
</span><span class="cx"> {
</span><ins>+ // Do not call the parent class isEqual here, because we are not cueType() == VTTCue,
+ // and will fail that equality test.
</ins><span class="cx"> if (!TextTrackCue::isEqual(cue, match))
</span><span class="cx"> return false;
</span><span class="cx">
</span><span class="lines">@@ -172,7 +174,7 @@
</span><span class="cx"> if (m_backgroundColor != other->backgroundColor())
</span><span class="cx"> return false;
</span><span class="cx">
</span><del>- return VTTCue::isEqual(cue, match);
</del><ins>+ return true;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool TextTrackCueGeneric::isOrderedBefore(const TextTrackCue* that) const
</span></span></pre></div>
<a id="trunkSourceWebCorehtmltrackTextTrackCueGenerich"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/html/track/TextTrackCueGeneric.h (168518 => 168519)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/html/track/TextTrackCueGeneric.h 2014-05-09 04:37:25 UTC (rev 168518)
+++ trunk/Source/WebCore/html/track/TextTrackCueGeneric.h 2014-05-09 05:20:59 UTC (rev 168519)
</span><span class="lines">@@ -78,6 +78,7 @@
</span><span class="cx">
</span><span class="cx"> private:
</span><span class="cx"> virtual bool isOrderedBefore(const TextTrackCue*) const override;
</span><ins>+ virtual double startTimeVariance() const override { return 0.25; }
</ins><span class="cx">
</span><span class="cx"> TextTrackCueGeneric(ScriptExecutionContext&, double start, double end, const String&);
</span><span class="cx">
</span></span></pre>
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