VLC decoding tables

VLC tables to decode VLC codewords to these fields: (in order)
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Functions
OPJ_BOOL	vlc_init_tables ()
	Initializes vlc_tbl0 and vlc_tbl1 tables, from table0.h and table1.h.

Variables
int	vlc_tbl0 [1024] = { 0 }
	vlc_tbl0 contains decoding information for initial row of quads
int	vlc_tbl1 [1024] = { 0 }
	vlc_tbl1 contains decoding information for non-initial row of quads
OPJ_BOOL	vlc_tables_initialized = OPJ_FALSE
	Initializes VLC tables vlc_tbl0 and vlc_tbl1.

Detailed Description

VLC tables to decode VLC codewords to these fields: (in order)
.

• cwd_len : 3bits -> the codeword length of the VLC codeword; the VLC cwd is in the LSB of bitstream
  
• u_off : 1bit -> u_offset, which is 1 if u value is not 0
  
• rho : 4bits -> significant samples within a quad
  
• e_1 : 4bits -> EMB e_1
  
• e_k : 4bits -> EMB e_k
  
  The table index is 10 bits and composed of two parts:
  The 7 LSBs contain a codeword which might be shorter than 7 bits; this word is the next decoable bits in the bitstream.
  The 3 MSB is the context of for the codeword.
  

Function Documentation

vlc_init_tables()

OPJ_BOOL vlc_init_tables

(

)

Initializes vlc_tbl0 and vlc_tbl1 tables, from table0.h and table1.h.

References OPJ_FALSE, OPJ_TRUE, tbl0, tbl1, vlc_tbl0, and vlc_tbl1.

Referenced by main().

Variable Documentation

vlc_tables_initialized

OPJ_BOOL vlc_tables_initialized = OPJ_FALSE

Initializes VLC tables vlc_tbl0 and vlc_tbl1.

Referenced by main().

vlc_tbl0

int vlc_tbl0[1024] = { 0 }

vlc_tbl0 contains decoding information for initial row of quads

Referenced by main(), opj_t1_ht_decode_cblk(), and vlc_init_tables().

vlc_tbl1

int vlc_tbl1[1024] = { 0 }

vlc_tbl1 contains decoding information for non-initial row of quads

Referenced by main(), opj_t1_ht_decode_cblk(), and vlc_init_tables().