Bug 756372 - Change |seeking| to prevent seeking in WebM livestream. r=kinetik

content/media/gstreamer/nsGStreamerReader.h

@@ -34,6 +34,10 @@ public:
                         PRInt64 aCurrentTime);
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);
 
+  virtual bool IsSeekableInBufferedRanges() {
+    return true;
+  }
+
   virtual bool HasAudio() {
     return mInfo.mHasAudio;
   }

content/media/nsBuiltinDecoder.cpp

@@ -985,7 +985,13 @@ nsresult nsBuiltinDecoder::GetSeekable(nsTimeRanges* aSeekable)
     return NS_OK;
   }
 
-  return GetBuffered(aSeekable);
+  if (mDecoderStateMachine->IsSeekableInBufferedRanges()) {
+    return GetBuffered(aSeekable);
+  } else {
+    // The stream is not seekable using only buffered ranges, and is not
+    // seekable. Don't allow seeking (return no ranges in |seekable|).
+    return NS_OK;
+  }
 }
 
 void nsBuiltinDecoder::SetEndTime(double aTime)

content/media/nsBuiltinDecoder.h

@@ -331,6 +331,9 @@ public:
 
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered) = 0;
 
+  // Return true if the media is seekable using only buffered ranges.
+  virtual bool IsSeekableInBufferedRanges() = 0;
+
   virtual PRInt64 VideoQueueMemoryInUse() = 0;
   virtual PRInt64 AudioQueueMemoryInUse() = 0;
 

content/media/nsBuiltinDecoderReader.h

@@ -480,6 +480,9 @@ public:
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered,
                                PRInt64 aStartTime) = 0;
 
+  // True if we can seek using only buffered ranges. This is backend dependant.
+  virtual bool IsSeekableInBufferedRanges() = 0;
+
   class VideoQueueMemoryFunctor : public nsDequeFunctor {
   public:
     VideoQueueMemoryFunctor() : mResult(0) {}

content/media/nsBuiltinDecoderStateMachine.h

@@ -243,6 +243,13 @@ public:
     return mSeekable;
   }
 
+  bool IsSeekableInBufferedRanges() {
+    if (mReader) {
+      return mReader->IsSeekableInBufferedRanges();
+    }
+    return false;
+  }
+
   // Sets the current frame buffer length for the MozAudioAvailable event.
   // Accessed on the main and state machine threads.
   virtual void SetFrameBufferLength(PRUint32 aLength);

content/media/ogg/nsOggReader.h

@@ -84,6 +84,11 @@ public:
   virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);
 
+  // We use bisection to seek in buffered range.
+  virtual bool IsSeekableInBufferedRanges() {
+    return true;
+  }
+
 private:
 
   bool HasSkeleton() {

content/media/raw/nsRawReader.h

@@ -70,6 +70,11 @@ public:
   virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);
 
+  // By seeking in the media resource, it is possible to seek.
+  bool IsSeekableInBufferedRanges() {
+    return true;
+  }
+
 private:
   bool ReadFromResource(MediaResource *aResource, PRUint8 *aBuf, PRUint32 aLength);
 

content/media/wave/nsWaveReader.h

@@ -68,6 +68,11 @@ public:
   virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);
 
+  // To seek in a buffered range, we just have to seek the stream.
+  virtual bool IsSeekableInBufferedRanges() {
+    return true;
+  }
+
 private:
   bool ReadAll(char* aBuf, PRInt64 aSize, PRInt64* aBytesRead = nsnull);
   bool LoadRIFFChunk();

content/media/webm/nsWebMReader.h

@@ -156,6 +156,11 @@ public:
     return mHasVideo;
   }
 
+  // Bug 575140, cannot seek in webm if no cue is present.
+  bool IsSeekableInBufferedRanges() {
+    return false;
+  }
+
   virtual nsresult ReadMetadata(nsVideoInfo* aInfo);
   virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
   virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);