video_coding: updates to jitter buffer logic: Make sure that every frame is inserted only once to the list.

Review URL: http://webrtc-codereview.appspot.com/165001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@648 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/video_coding/main/source/jitter_buffer.cc

@@ -1685,6 +1685,9 @@ VCMJitterBuffer::InsertPacket(VCMEncodedFrame* buffer, const VCMPacket& packet)
         }
 
         // Insert packet
+        // check for first packet
+        // high sequence number will not be set
+        bool first = frame->GetHighSeqNum() == -1;
         bufferReturn = frame->InsertPacket(packet, nowMs);
         ret = bufferReturn;
 
@@ -1700,8 +1703,7 @@ VCMJitterBuffer::InsertPacket(VCMEncodedFrame* buffer, const VCMPacket& packet)
 
             // Insert each frame once on the arrival of the first packet
             // belonging to that frame (media or empty)
-            if (state == kStateEmpty &&
-                frame->GetHighSeqNum() == packet.seqNum)
+            if (state == kStateEmpty && first)
             {
                 ret = kFirstPacket;
                 _frameBuffersTSOrder.Insert(frame);