rocDecode: Added decode buffer pool implementation for AVC and HEVC. (#355)

* * rocDecode: Initial check in for decode buffer pool.

* * rocDecode: All 135 streams pass.

* * rocDecode: Fixed a build error in debug mode.

* * rocDecode/HEVC: Removed two workaround in HEVC DPB management, after decode buffer pool implementa
tion.
 - WR 1: Conditional bumping (when max_num_reorder_pics > 0) to avoid synchronous job submission in
C.5.2.3.
 - WR 2: Add two more buffers in DPB to avoid buffer over-writing.

* * rocDecode/HEVC: Added display delay feature.

* * rocDecode/HEVC: Fixed the -z option issue within the context of the new decode buffer pool implementation.

* * rocDecode/HEVC: Removed redundent code.

* * rocDecode/AVC: Added decode buffer pool implementation for AVC.

* * rocDecode: Added a few changes.
 - Added display delay feature to AVC.
 - Removed a workaround for AVC: AVC_MAX_DPB_FRAMES was increased to 18. Now it is back to 16.
 - Removed a workaround for AVC: increased DPB buffer size by 2. Now it is back to normal.
 - Code format changes for HEVC.

* * rocDecode/AVC: Fixed the -z option issue within the context of the new decode buffer pool implementation.

* * rocDecode: Merged OutputDecodedPictures() method to upper class RocVideoParser.

* * rocDecode: Code cleanup. No functional changes.

* * rocDecode: Made decode buffer pool size adaptive.
 - Removed the hard coded decode buffer pool size set in the decoder.
 - Exposed the display delay parameter from RocVideoDecoder class to the user.
 - Now the decoder buffer pool size is determined from the DPB buffer size and display delay parameter.

* * rocDecode: Several changes based on code review.
 - Merged decode and display use status into one parameter.
 - Removed the surface index from DecodeFrameBuffer, which is now implicitly referred by the array index.
 - Changed a function name for better clarity.

* * rocDecode: Added a comment.

[ROCm/rocdecode commit: 61c8661b9c]

projects/rocdecode/src/parser/hevc_parser.h

@@ -98,6 +98,7 @@ protected:
      */
     typedef struct {
         int     pic_idx;  // picture index or id
+        int     dec_buf_idx;  // frame index in decode buffer pool
         // POC info
         int32_t pic_order_cnt;  // PicOrderCnt
         int32_t prev_poc_lsb;  // prevPicOrderCntLsb
@@ -107,7 +108,7 @@ protected:
 
         uint32_t pic_output_flag;  // PicOutputFlag
         uint32_t is_reference;
-        uint32_t use_status;  // 0 = empty; 1 = top used; 2 = bottom used; 3 = both fields or frame used
+        uint32_t use_status;    // refer to FrameBufUseStatus
     } HevcPicInfo;
 
     /*! \brief Decoded picture buffer
@@ -118,9 +119,6 @@ protected:
         uint32_t num_pics_needed_for_output;  // number of pictures in DPB that need to be output
         uint32_t dpb_fullness;  // number of pictures in DPB
         HevcPicInfo frame_buffer_list[HEVC_MAX_DPB_FRAMES];
-
-        uint32_t num_output_pics;  // number of pictures that are output after the decode call
-        uint32_t output_pic_list[HEVC_MAX_DPB_FRAMES]; // sorted output picuture index to frame_buffer_list[]
     } DecodedPictureBuffer;
 
     // Data members of HEVC class
@@ -308,11 +306,16 @@ protected:
      */
     int MarkOutputPictures();
 
+    /*! \brief Function to find a free buffer in the decode buffer pool
+     *  \return <tt>ParserResult</tt>
+     */
+    ParserResult FindFreeInDecBufPool();
+
     /*! \brief Function to find a free buffer in DPB for the current picture and mark it. Additional picture
      *         bumping is done if needed. C.5.2.3.
-     * \return Code in ParserResult form.
+     * \return <tt>ParserResult</tt>
      */
-    int FindFreeBufAndMark();
+    ParserResult FindFreeInDpbAndMark();
 
     /*! \brief Function to bump one picture out of DPB. C.5.2.4.
      * \return Code in ParserResult form.
@@ -333,6 +336,8 @@ protected:
     void PrintSliceSegHeader(HevcSliceSegHeader *slice_header_ptr);
     void PrintStRps(HevcShortTermRps *rps_ptr);
     void PrintLtRefInfo(HevcLongTermRps *lt_info_ptr);
+    void PrintDpb();
+    void PrintVappiBufInfo();
 #endif // DBGINFO
 
 private:
@@ -349,11 +354,6 @@ private:
      */
     int SendPicForDecode();
 
-    /*! \brief Callback function to output decoded pictures from DPB for post-processing.
-     * \return Return code in ParserResult form
-     */
-    int OutputDecodedPictures();
-
     bool IsIdrPic(HevcNalUnitHeader *nal_header_ptr);
     bool IsCraPic(HevcNalUnitHeader *nal_header_ptr);
     bool IsBlaPic(HevcNalUnitHeader *nal_header_ptr);