Added ClearTo(seq_num) to RtpFrameReferenceFinder.

webrtc/modules/video_coding/rtp_frame_reference_finder.h

Index: webrtc/modules/video_coding/rtp_frame_reference_finder.h
diff --git a/webrtc/modules/video_coding/rtp_frame_reference_finder.h b/webrtc/modules/video_coding/rtp_frame_reference_finder.h
index a812303b7ea85eea4e1a02992322f22473743367..cdc9ce8c092db7171bacd95910be7ca770133091 100644
--- a/webrtc/modules/video_coding/rtp_frame_reference_finder.h
+++ b/webrtc/modules/video_coding/rtp_frame_reference_finder.h
@@ -40,9 +40,17 @@ class OnCompleteFrameCallback {
 class RtpFrameReferenceFinder {
  public:
   explicit RtpFrameReferenceFinder(OnCompleteFrameCallback* frame_callback);
+
+  // Find all references for this frame.

[stefan-webrtc, 2016/09/07 13:29:57]

Maybe the method should be called that in stead of ManageFrame?

[philipel, 2016/09/08 11:27:19]

Updated the comment the better reflect what ManageFrame actually does.

   void ManageFrame(std::unique_ptr<RtpFrameObject> frame);
+
+  // Notifies that padding has been received, which the reference finder
+  // might need to calculate the references of a frame.
   void PaddingReceived(uint16_t seq_num);
 
+  // Clear all stashed frames that include packets older than |seq_num|.
+  void ClearTo(uint16_t seq_num);
+
  private:
   static const uint16_t kPicIdLength = 1 << 7;
   static const uint8_t kMaxTemporalLayers = 5;
@@ -177,6 +185,11 @@ class RtpFrameReferenceFinder {
              kMaxTemporalLayers>
       missing_frames_for_layer_ GUARDED_BY(crit_);
 
+  // How far frames have been cleared by sequence number. A frame will be
+  // cleared if it contains a packet with a sequence number older than
+  // |cleared_to_seq_num_|.
+  int cleared_to_seq_num_ GUARDED_BY(crit_);
+
   OnCompleteFrameCallback* frame_callback_;
 };