Deliver change notifications to SourceBuffer track lists.

third_party/WebKit/Source/modules/mediasource/MediaSource.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/events/Event.h"
 #include "core/events/GenericEventQueue.h"
 #include "core/frame/Deprecation.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLMediaElement.h"
+#include "core/html/track/AudioTrackList.h"
+#include "core/html/track/VideoTrackList.h"
 #include "modules/mediasource/MediaSourceRegistry.h"
+#include "modules/mediasource/SourceBufferTrackBaseSupplement.h"
 #include "platform/ContentType.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
 #include "public/platform/WebMediaSource.h"
 #include "public/platform/WebSourceBuffer.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/text/CString.h"
 #include <memory>
 
@@ skipping 356 matching lines @@
 
         // 3. Return a single range with a start time of 0 and an end time equal to the highest end
         //    time reported by the HTMLMediaElement.buffered attribute.
         return TimeRanges::create(0, buffered->end(buffered->length() - 1, ASSERT_NO_EXCEPTION));
     }
 
     // 3. Otherwise: Return a single range with a start time of 0 and an end time equal to duration.
     return TimeRanges::create(0, sourceDuration);
 }
 
+void MediaSource::onTrackChanged(TrackBase* track)
+{
+    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
+    SourceBuffer* sourceBuffer = SourceBufferTrackBaseSupplement::sourceBuffer(*track);
+    if (!sourceBuffer)
+        return;
+
+    DCHECK(m_sourceBuffers->contains(sourceBuffer));
+    if (track->type() == WebMediaPlayer::AudioTrack) {
+        sourceBuffer->audioTracks().scheduleChangeEvent();
+    } else if (track->type() == WebMediaPlayer::VideoTrack) {
+        if (static_cast<VideoTrack*>(track)->selected())
+            sourceBuffer->videoTracks().trackSelected(track->id());
+        sourceBuffer->videoTracks().scheduleChangeEvent();
+    }
+
+    bool isActive = (sourceBuffer->videoTracks().selectedIndex() != -1) || sourceBuffer->audioTracks().hasEnabledTrack();
+    setSourceBufferActive(sourceBuffer, isActive);
+}
+
 void MediaSource::setDuration(double duration, ExceptionState& exceptionState)
 {
     // 2.1 http://www.w3.org/TR/media-source/#widl-MediaSource-duration
     // 1. If the value being set is negative or NaN then throw an InvalidAccessError
     // exception and abort these steps.
     if (std::isnan(duration)) {
         logAndThrowDOMException(exceptionState, InvalidAccessError, ExceptionMessages::notAFiniteNumber(duration, "duration"));
         return;
     }
     if (duration < 0.0) {
@@ skipping 165 matching lines @@
 
     //   3. Do various steps based on |eosStatus|.
     m_webMediaSource->markEndOfStream(eosStatus);
 }
 
 bool MediaSource::isOpen() const
 {
     return readyState() == openKeyword();
 }
 
-void MediaSource::setSourceBufferActive(SourceBuffer* sourceBuffer)
+void MediaSource::setSourceBufferActive(SourceBuffer* sourceBuffer, bool isActive)
 {
-    DCHECK(!m_activeSourceBuffers->contains(sourceBuffer));
+    if (!isActive) {
+        DCHECK(m_activeSourceBuffers->contains(sourceBuffer));
+        m_activeSourceBuffers->remove(sourceBuffer);
+        return;
+    }
+
+    if (m_activeSourceBuffers->contains(sourceBuffer))
+        return;
 
     // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-MediaSource-activeSourceBuffers
     // SourceBuffer objects in SourceBuffer.activeSourceBuffers must appear in
     // the same order as they appear in SourceBuffer.sourceBuffers.
     // SourceBuffer transitions to active are not guaranteed to occur in the
     // same order as buffers in |m_sourceBuffers|, so this method needs to
     // insert |sourceBuffer| into |m_activeSourceBuffers|.
     size_t indexInSourceBuffers = m_sourceBuffers->find(sourceBuffer);
     DCHECK(indexInSourceBuffers != kNotFound);
 
@@ skipping 94 matching lines @@
 
     m_asyncEventQueue->enqueueEvent(event);
 }
 
 URLRegistry& MediaSource::registry() const
 {
     return MediaSourceRegistry::registry();
 }
 
 } // namespace blink