VLC decoding tables

VLC decoding tables used in decoding VLC codewords to these fields:
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Functions
static bool	grk::t1::ojph::local::vlc_init_tables ()
	Initializes vlc_tbl0 and vlc_tbl1 tables, from table0.h and table1.h.

Variables
ui16	grk::t1::ojph::local::vlc_tbl0 [1024] = { 0 }
	vlc_tbl0 contains decoding information for initial row of quads
ui16	grk::t1::ojph::local::vlc_tbl1 [1024] = { 0 }
	vlc_tbl1 contains decoding information for non-initial row of quads
static bool	grk::t1::ojph::local::vlc_tables_initialized = vlc_init_tables()
	Initializes VLC tables vlc_tbl0 and vlc_tbl1.

Detailed Description

VLC decoding tables used in decoding VLC codewords to these fields:
.

• 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 decodable bits in the bitstream.
  The 3 MSB is the context of for the codeword.
  

Function Documentation

vlc_init_tables()

bool grk::t1::ojph::local::vlc_init_tables ( )

static

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

References vlc_tbl0, and vlc_tbl1.

Referenced by initialize_block_encoder_tables().

Variable Documentation

vlc_tables_initialized

bool grk::t1::ojph::local::vlc_tables_initialized = vlc_init_tables()

static

Initializes VLC tables vlc_tbl0 and vlc_tbl1.

vlc_tbl0

ui16 grk::t1::ojph::local::vlc_tbl0 = { 0 }

vlc_tbl0 contains decoding information for initial row of quads

Referenced by initialize_block_encoder_tables(), ojph_decode_codeblock32(), ojph_decode_codeblock64(), ojph_decode_codeblock_wasm(), ojph_encode_codeblock32(), ojph_encode_codeblock64(), and vlc_init_tables().

vlc_tbl1

ui16 grk::t1::ojph::local::vlc_tbl1 = { 0 }

vlc_tbl1 contains decoding information for non-initial row of quads

Referenced by initialize_block_encoder_tables(), ojph_decode_codeblock32(), ojph_decode_codeblock64(), ojph_decode_codeblock_wasm(), ojph_encode_codeblock32(), ojph_encode_codeblock64(), and vlc_init_tables().