Work on flexible mode and screen sharing.

webrtc/modules/video_coding/main/source/decoding_state.h

Index: webrtc/modules/video_coding/main/source/decoding_state.h
diff --git a/webrtc/modules/video_coding/main/source/decoding_state.h b/webrtc/modules/video_coding/main/source/decoding_state.h
index 99ee33519530fa78d431ed3ff43a38e360af4c39..6e5cb7777e9403dfa120b7213966f58b67a88f30 100644
--- a/webrtc/modules/video_coding/main/source/decoding_state.h
+++ b/webrtc/modules/video_coding/main/source/decoding_state.h
@@ -21,6 +21,11 @@ class VCMPacket;
 
 class VCMDecodingState {
  public:
+  // The max number of bits used to reference back
+  // to a previous frame when using flexible mode.
+  static const uint16_t kNoRefBits = 14;

[sprang_webrtc, 2015/09/15 15:41:22]

kNumRefBits or kMaxRefBits. Otherwise it sounds like a special value used to
indicates we have no reference bits.

[philipel, 2015/09/16 09:35:54]

Done.

+  static const uint16_t kFrameDecodedLength = 1 << kNoRefBits;
+
   VCMDecodingState();
   ~VCMDecodingState();
   // Check for old frame
@@ -52,7 +57,9 @@ class VCMDecodingState {
   bool ContinuousPictureId(int picture_id) const;
   bool ContinuousSeqNum(uint16_t seq_num) const;
   bool ContinuousLayer(int temporal_id, int tl0_pic_id) const;
+  bool ContinuousFrameRefs(const VCMFrameBuffer* frame) const;
   bool UsingPictureId(const VCMFrameBuffer* frame) const;
+  bool UsingFlexibleMode(const VCMFrameBuffer* frame) const;
 
   // Keep state of last decoded frame.
   // TODO(mikhal/stefan): create designated classes to handle these types.
@@ -63,6 +70,10 @@ class VCMDecodingState {
   int         tl0_pic_id_;
   bool        full_sync_;  // Sync flag when temporal layers are used.
   bool        in_initial_state_;
+
+  // Used to check references in flexible mode
+  bool frame_decoded_[1 << kNoRefBits];
+  uint16_t fd_cleared_to_;

[sprang_webrtc, 2015/09/15 15:41:22]

which file descriptor is that?

[philipel, 2015/09/16 09:35:54]

Renamed to frame_decoded_cleared_to_.

 };
 
 }  // namespace webrtc