An explanation of the HEVC residual coefficient decoding code

In the previous article mainly introduced the principle of coding, here is mainly a combination of HM code to introduce the method of reading residual coefficient

Introduction to the entropy decoding of HM transformation coefficients:

Initial one Tu object

Member Variable Description:

Public:

typedef enum Tu_split_mode { dont_split=0, vertical_split=1, quad_split=2, number_of_split_modes= 3}  Split_mode; three kinds of splitting methods of//<tu in the process of recursion

Static Const UInt number_of_sections[number_of_split_modes];

protected:

Chromaformat Mchromaformat;

Bool Mbprocesslastoflevel; //If True, then if size N/2 x N/2 are invalid, the NXN block for a channel are processed only for the last block, not t He first.

UInt mcudepth; //<CU is the root node of Tu, recording cu depth

UInt mtrdepthrelcu[max_num_component]; //< Record the depth of Tu relative to Cu

UInt msection; //< If split, then the SUBCU index is processed after splitting

Tu_split_mode Msplitmode; //< the split mode

tcomrectangle mrect[max_num_component]; //< Position information of the current TU Bool mcodeall[max_num_component];

UInt morigwidth[max_num_component];

UInt moffsets[max_num_component]; //<cur Tu is offset from the upper left corner of the Cu, for example tu is 8*8, then the second TU is offset by 64 bit

UInt Mabspartidxcu; //<the ABS Index of CU in LCU

UInt MABSPARTIDXTURELCU; //<the ABS Index of TU in cur CU

UInt Mabspartidxstep; //<if Split, the added index

Tcomdatacu *MPCCU;

UInt mlog2trlumasize; //< relative to the size of Cur TU

tcomtu *mpparent; //< If the split is recursive, the corresponding parent node

The following is the decoded flowchart of this peripheral

There are two more important functions involved:

PARESECBF and parsecoeffnxn, the previous function is relatively simple, the next one will focus on the second function

Because it involves a lot of forms, it's not good to edit here, I just put it up.

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http://download.csdn.net/detail/xietingcandice/8329321

An explanation of the HEVC residual coefficient decoding code