OpenFastVC/ImplementionForAVS3

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• • OpenFastVC for AVS3
  • • a) Intermediate coding information output
    • b) Designed algorithm integration
    • c) Coding performance evaluation

OpenFastVC for AVS3

OpenFastVC for AVS3 is developed based on the reference software of AVS3, named HPM. The deployment of the project follows the README.md of HPM.

In the deployed projected, OpenFastVC provides three macro switches to control the intermediate coding information output, coding decision process, and the reference fast algorithm, respectively. The current version of OpenFastVC primarily offers support for coding unit (CU) partitioning. The three macro switches are as follows.

#define OFVC_OUTPUT_CU_INFO                               0
#define OFVC_CU_DECISION_CTRL                             0

#if OFVC_CU_DECISION_CTRL
#define OFVC_CU_DECISION_REF_ALG1                         0
#endif

a) Intermediate coding information output

Setting OFVC_OUTPUT_CU_INFO to 1 can enable the output of CU partitioning information,where an example is illustrated below for reference. x and y are the position of current CU. w and h denote the CU width and height, respectively. qt_depth reflects how many times the current CU has undergone QT partition thus far. bet_depth denotes the split times by BT and EQT modes. split_mode is the optimal split mode of current CU.

x:0-y:0-w:64-h:64-qt_depth:1-bet_depth:0-split_mode:1
x:0-y:0-w:32-h:64-qt_depth:1-bet_depth:1-split_mode:0

b) Designed algorithm integration

Setting OFVC_CU_DECISION_CTRL to 1 can achieve the control over CU partition process. Moreover, the utilization of each partitioning mode is controlled by fast_split_results[6]. The six digit number represent Non-Split, Ver-BT, Hor-BT, Ver-EQT, Hor-EQT, and QT, respectively. The value $0$ represents removing the corresponding partitioning mode from candidate list, and $1$ denotes retaining this mode. The designed fast algorithm can regulate the CU partition by assigning the corresponding value to fast_split_results[6].

int fast_split_results[6];

c) Coding performance evaluation

To facilitate the performance evaluation of the designed algorithm, OpenFastVC also provides reference fast algorithm. In the current version, the fast CU partitioning algorithm proposed in [1] has been implemented, where it can be enabled by setting OFVC_CU_DECISION_REF_ALG1 to 1.

[1] Hang Yuan, Wei Gao, Junle Wang, "Dynamic Computational Resource Allocation for Fast Inter Frame Coding in Video Conferencing Applications," IEEE International Conference on Multimedia and Expo (ICME), Shenzhen, China, July 5-9, 2021.