OpenJPH
Open-source implementation of JPEG2000 Part-15
VLC decoding tables

Functions

static bool ojph::local::uvlc_init_tables ()
 Initializes uvlc_tbl0 and uvlc_tbl1 tables. More...
 

Variables

ui16 ojph::local::uvlc_tbl0 [256+64] = { 0 }
 uvlc_tbl0 contains decoding information for initial row of quads More...
 
ui16 ojph::local::uvlc_tbl1 [256] = { 0 }
 uvlc_tbl1 contains decoding information for non-initial row of quads More...
 
static bool ojph::local::uvlc_tables_initialized = uvlc_init_tables()
 Initializes UVLC tables uvlc_tbl0 and uvlc_tbl1. More...
 

Detailed Description

UVLC decoding tables used to partiallu decode u values from UVLC
codewords.
The table index is 8 (or 9) bits and composed of two parts:
The 6 LSBs carries the head of the VLC to be decoded. Up to 6 bits to be used; these are uvlc prefix code for quad 0 and 1
The 2 (or 3) MSBs contain u_off of quad 0 + 2 * o_off quad 1

Function Documentation

◆ uvlc_init_tables()

static bool ojph::local::uvlc_init_tables ( )
static

#include </home/atzlinux/devel/official/openjph/src/core/coding/ojph_block_common.cpp>

Initializes uvlc_tbl0 and uvlc_tbl1 tables.

Definition at line 178 of file ojph_block_common.cpp.

References ojph::local::uvlc_tbl0, and ojph::local::uvlc_tbl1.

Referenced by ojph::local::initialize_tables().

Variable Documentation

◆ uvlc_tables_initialized

bool ojph::local::uvlc_tables_initialized = uvlc_init_tables()
static

#include </home/atzlinux/devel/official/openjph/src/core/coding/ojph_block_common.cpp>

Initializes UVLC tables uvlc_tbl0 and uvlc_tbl1.

Definition at line 326 of file ojph_block_common.cpp.

◆ uvlc_tbl0

◆ uvlc_tbl1

ui16 ojph::local::uvlc_tbl1 = { 0 }