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/avc_parser.h

@@ -60,6 +60,7 @@ public:
 
     typedef struct {
         int      pic_idx;  // picture index or id
+        int      dec_buf_idx;  // frame index in decode buffer pool
         PictureStructure pic_structure;
         int32_t  pic_order_cnt;
         int32_t  top_field_order_cnt;
@@ -70,7 +71,7 @@ public:
         int32_t  long_term_pic_num; // LongTermPicNum
         uint32_t long_term_frame_idx; // LongTermFrameIdx: long term reference frame/field identifier
         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
         uint32_t pic_output_flag;  // OutputFlag
     } AvcPicture;
 
@@ -134,6 +135,7 @@ protected:
     uint32_t field_pic_count_;
     int second_field_;
     int first_field_pic_idx_;
+    int first_field_dec_buf_idx_;
 
     // DPB
     AvcPicture curr_pic_;
@@ -150,11 +152,6 @@ protected:
      */
     ParserResult SendPicForDecode();
 
-    /*! \brief Function to output decoded pictures from DPB for post-processing.
-     * \return Return code in ParserResult form
-     */
-    ParserResult OutputDecodedPictures();
-
     /*! \brief Callback function to send parsed SEI playload to decoder.
      */
     void SendSeiMsgPayload();
@@ -263,6 +260,11 @@ protected:
      */
     ParserResult CheckDpbAndOutput();
 
+    /*! \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
      * \return <tt>ParserResult</tt>
      */