MSE: Implement SourceBuffer.trackDefaults

Source/modules/mediasource/SourceBuffer.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 65 matching lines @@
 {
     SourceBuffer* sourceBuffer = new SourceBuffer(webSourceBuffer, source, asyncEventQueue);
     sourceBuffer->suspendIfNeeded();
     return sourceBuffer;
 }
 
 SourceBuffer::SourceBuffer(PassOwnPtr<WebSourceBuffer> webSourceBuffer, MediaSource* source, GenericEventQueue* asyncEventQueue)
     : ActiveDOMObject(source->executionContext())
     , m_webSourceBuffer(webSourceBuffer)
     , m_source(source)
+    , m_trackDefaults(TrackDefaultList::create())

[haraken, 2014/12/16 01:16:16]

Do we need to create an empty vector? Can we just use nullptr?

[sof, 2014/12/16 07:24:36]

Don't think the IDL allows for that in practice, an empty TrackListDefault
should be returned.

[philipj_slow, 2014/12/16 09:55:48]

Right, that is the topic of the spec bug Matthew filed:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=27599

     , m_asyncEventQueue(asyncEventQueue)
     , m_mode(segmentsKeyword())
     , m_updating(false)
     , m_timestampOffset(0)
     , m_appendWindowStart(0)
     , m_appendWindowEnd(std::numeric_limits<double>::infinity())
     , m_firstInitializationSegmentReceived(false)
     , m_pendingAppendDataOffset(0)
     , m_appendBufferAsyncPartRunner(this, &SourceBuffer::appendBufferAsyncPart)
     , m_pendingRemoveStart(-1)
@@ skipping 263 matching lines @@
 
     // 7.4. Queue a task to fire a simple event named updatestart at this SourceBuffer object.
     scheduleEvent(EventTypeNames::updatestart);
 
     // 7.5. Return control to the caller and run the rest of the steps asynchronously.
     m_pendingRemoveStart = start;
     m_pendingRemoveEnd = end;
     m_removeAsyncPartRunner.runAsync();
 }
 
+void SourceBuffer::setTrackDefaults(TrackDefaultList* trackDefaults, ExceptionState& exceptionState)
+{
+    // Per 02 Dec 2014 Editor's Draft
+    // http://w3c.github.io/media-source/#widl-SourceBuffer-trackDefaults
+    // 1. If this object has been removed from the sourceBuffers attribute of
+    //    the parent media source, then throw an InvalidStateError exception
+    //    and abort these steps.
+    // 2. If the updating attribute equals true, then throw an InvalidStateError
+    //    exception and abort these steps.
+    if (throwExceptionIfRemovedOrUpdating(isRemoved(), m_updating, exceptionState))
+        return;
+
+    // 3. Update the attribute to the new value.
+    m_trackDefaults = trackDefaults;
+}
+
 void SourceBuffer::abortIfUpdating()
 {
     // Section 3.2 abort() method step 3 substeps.
     // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#widl-SourceBuffer-abort-void
 
     if (!m_updating)
         return;
 
     const char* traceEventName = 0;
     if (!m_pendingAppendData.isEmpty()) {
@@ skipping 360 matching lines @@
 void SourceBuffer::didFail(FileError::ErrorCode errorCode)
 {
     WTF_LOG(Media, "SourceBuffer::didFail(%d) %p", errorCode, this);
     appendStreamDone(false);
 }
 
 void SourceBuffer::trace(Visitor* visitor)
 {
     visitor->trace(m_source);
     visitor->trace(m_stream);
+    visitor->trace(m_trackDefaults);
     visitor->trace(m_asyncEventQueue);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink