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.

utils/rocvideodecode/roc_video_dec.cpp

@@ -23,9 +23,9 @@ THE SOFTWARE.
 #include "roc_video_dec.h"
 
 RocVideoDecoder::RocVideoDecoder(int device_id, OutputSurfaceMemoryType out_mem_type, rocDecVideoCodec codec, bool force_zero_latency,
-              const Rect *p_crop_rect, bool extract_user_sei_Message, int max_width, int max_height, uint32_t clk_rate) :
+              const Rect *p_crop_rect, bool extract_user_sei_Message, uint32_t disp_delay, int max_width, int max_height, uint32_t clk_rate) :
               device_id_{device_id}, out_mem_type_(out_mem_type), codec_id_(codec), b_force_zero_latency_(force_zero_latency), 
-              b_extract_sei_message_(extract_user_sei_Message), max_width_ (max_width), max_height_(max_height) {
+              b_extract_sei_message_(extract_user_sei_Message), disp_delay_(disp_delay), max_width_ (max_width), max_height_(max_height) {
 
     if (!InitHIP(device_id_)) {
         THROW("Failed to initilize the HIP");
@@ -39,9 +39,9 @@ RocVideoDecoder::RocVideoDecoder(int device_id, OutputSurfaceMemoryType out_mem_
     // create rocdec videoparser
     RocdecParserParams parser_params = {};
     parser_params.codec_type = codec_id_;
-    parser_params.max_num_decode_surfaces = 1;
+    parser_params.max_num_decode_surfaces = 1; // let the parser to determine the decode buffer pool size
     parser_params.clock_rate = clk_rate;
-    parser_params.max_display_delay = 0;
+    parser_params.max_display_delay = disp_delay_;
     parser_params.user_data = this;
     parser_params.pfn_sequence_callback = HandleVideoSequenceProc;
     parser_params.pfn_decode_picture = HandlePictureDecodeProc;