* rocDecode/AVC: Added support for gaps in frame_num. (#319)

- Fixed decode failure of conformance stream MR3_TANDBERG_B.264.

[ROCm/rocdecode commit: a8bcc1e62f]

projects/rocdecode/src/parser/avc_parser.h

@@ -119,6 +119,7 @@ protected:
     int prev_top_field_order_cnt_;
     int prev_frame_num_offset_; // prevFrameNumOffset
     int prev_frame_num_; // prevFrameNum
+    int prev_ref_frame_num_; // PrevRefFrameNum
     int prev_has_mmco_5_;
     int curr_has_mmco_5_;
     int prev_ref_pic_bottom_field_;
@@ -217,6 +218,11 @@ protected:
      */
     void CalculateCurrPoc();
 
+    /*! \brief Function to check and decode gaps in frame_num. 8.2.5.2.
+     * \return <tt>ParserResult</tt>
+     */
+   ParserResult DecodeFrameNumGaps();
+
     /*! \brief Function to set up the reference picutre lists for each slice. 8.2.4.
      * \param [in] p_slice_info Poiner to slice info struct
      * \return <tt>ParserResult</tt>