Bug 813209 - Refactor MediaResource into BaseMediaResource so that we can base the implementation of BufferMediaSource on top of MediaSource; r=cpearce

This refactoring is needed for the introduction of the BufferMediaResource class.

--HG--
extra : rebase_source : e4b5016e9b947948799f1b8975b23a3dd685a366

content/media/MediaResource.cpp

@@ -49,7 +49,7 @@ namespace mozilla {
 
 ChannelMediaResource::ChannelMediaResource(MediaDecoder* aDecoder,
     nsIChannel* aChannel, nsIURI* aURI)
-  : MediaResource(aDecoder, aChannel, aURI),
+  : BaseMediaResource(aDecoder, aChannel, aURI),
     mOffset(0), mSuspendCount(0),
     mReopenOnError(false), mIgnoreClose(false),
     mCacheStream(this),
@@ -1153,11 +1153,11 @@ ChannelMediaResource::PossiblyResume()
   }
 }
 
-class FileMediaResource : public MediaResource
+class FileMediaResource : public BaseMediaResource
 {
 public:
   FileMediaResource(MediaDecoder* aDecoder, nsIChannel* aChannel, nsIURI* aURI) :
-    MediaResource(aDecoder, aChannel, aURI),
+    BaseMediaResource(aDecoder, aChannel, aURI),
     mSize(-1),
     mLock("FileMediaResource.mLock"),
     mSizeInitialized(false)
@@ -1514,7 +1514,7 @@ MediaResource::Create(MediaDecoder* aDecoder, nsIChannel* aChannel)
   return new ChannelMediaResource(aDecoder, aChannel, uri);
 }
 
-void MediaResource::MoveLoadsToBackground() {
+void BaseMediaResource::MoveLoadsToBackground() {
   NS_ASSERTION(!mLoadInBackground, "Why are you calling this more than once?");
   mLoadInBackground = true;
   if (!mChannel) {
@@ -1545,7 +1545,7 @@ void MediaResource::MoveLoadsToBackground() {
   }
 }
 
-void MediaResource::ModifyLoadFlags(nsLoadFlags aFlags)
+void BaseMediaResource::ModifyLoadFlags(nsLoadFlags aFlags)
 {
   nsCOMPtr<nsILoadGroup> loadGroup;
   DebugOnly<nsresult> rv = mChannel->GetLoadGroup(getter_AddRefs(loadGroup));

content/media/MediaResource.h

@@ -146,14 +146,11 @@ public:
 class MediaResource
 {
 public:
-  virtual ~MediaResource()
-  {
-    MOZ_COUNT_DTOR(MediaResource);
-  }
+  virtual ~MediaResource() {}
 
   // The following can be called on the main thread only:
   // Get the URI
-  nsIURI* URI() const { return mURI; }
+  virtual nsIURI* URI() const { return nullptr; }
   // Close the resource, stop any listeners, channels, etc.
   // Cancels any currently blocking Read request and forces that request to
   // return an error.
@@ -227,7 +224,7 @@ public:
   // Moves any existing channel loads into the background, so that they don't
   // block the load event. Any new loads initiated (for example to seek)
   // will also be in the background.
-  void MoveLoadsToBackground();
+  virtual void MoveLoadsToBackground() {}
   // Ensures that the value returned by IsSuspendedByCache below is up to date
   // (i.e. the cache has examined this stream at least once).
   virtual void EnsureCacheUpToDate() {}
@@ -307,15 +304,25 @@ public:
    * aRanges is being used.
    */
   virtual nsresult GetCachedRanges(nsTArray<MediaByteRange>& aRanges) = 0;
+};
+
+class BaseMediaResource : public MediaResource {
+public:
+  virtual nsIURI* URI() const { return mURI; }
+  virtual void MoveLoadsToBackground();
 
 protected:
-  MediaResource(MediaDecoder* aDecoder, nsIChannel* aChannel, nsIURI* aURI) :
+  BaseMediaResource(MediaDecoder* aDecoder, nsIChannel* aChannel, nsIURI* aURI) :
     mDecoder(aDecoder),
     mChannel(aChannel),
     mURI(aURI),
     mLoadInBackground(false)
   {
-    MOZ_COUNT_CTOR(MediaResource);
+    MOZ_COUNT_CTOR(BaseMediaResource);
+  }
+  virtual ~BaseMediaResource()
+  {
+    MOZ_COUNT_DTOR(BaseMediaResource);
   }
 
   // Set the request's load flags to aFlags.  If the request is part of a
@@ -349,7 +356,7 @@ protected:
  * All synchronization is performed by MediaCacheStream; all off-main-
  * thread operations are delegated directly to that object.
  */
-class ChannelMediaResource : public MediaResource
+class ChannelMediaResource : public BaseMediaResource
 {
 public:
   ChannelMediaResource(MediaDecoder* aDecoder, nsIChannel* aChannel, nsIURI* aURI);