vlc.c File Reference

VLC support functions. More...

#include "contributors.h"
#include "global.h"
#include "vlc.h"
#include "elements.h"

Include dependency graph for vlc.c:

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Defines

#define SYMTRACESTRING(s)

Functions

int ue_v (char *tracestring, Bitstream *bitstream)

int se_v (char *tracestring, Bitstream *bitstream)

int u_v (int LenInBits, char *tracestring, Bitstream *bitstream)

int i_v (int LenInBits, char *tracestring, Bitstream *bitstream)

Boolean u_1 (char *tracestring, Bitstream *bitstream)

void linfo_ue (int len, int info, int *value1, int *dummy)

void linfo_se (int len, int info, int *value1, int *dummy)

void linfo_cbp_intra (int len, int info, int *cbp, int *dummy)

void linfo_cbp_inter (int len, int info, int *cbp, int *dummy)

void linfo_levrun_inter (int len, int info, int *level, int *irun)

void linfo_levrun_c2x2 (int len, int info, int *level, int *irun)

int readSyntaxElement_VLC (SyntaxElement *sym, Bitstream *currStream)

int readSyntaxElement_UVLC (SyntaxElement *sym, ImageParameters *img, struct datapartition *dP)

int readSyntaxElement_Intra4x4PredictionMode (SyntaxElement *sym, ImageParameters *img, Bitstream *currStream)

int GetVLCSymbol_IntraMode (byte buffer[], int totbitoffset, int *info, int bytecount)

int more_rbsp_data (byte buffer[], int totbitoffset, int bytecount)

int uvlc_startcode_follows (Slice *currSlice, int dummy)

int GetVLCSymbol (byte buffer[], int totbitoffset, int *info, int bytecount)

static int ShowBitsThres (int inf, int numbits)

int code_from_bitstream_2d (SyntaxElement *sym, Bitstream *currStream, const byte *lentab, const byte *codtab, int tabwidth, int tabheight, int *code)

int readSyntaxElement_FLC (SyntaxElement *sym, Bitstream *currStream)

int readSyntaxElement_NumCoeffTrailingOnes (SyntaxElement *sym, Bitstream *currStream, char *type)

int readSyntaxElement_NumCoeffTrailingOnesChromaDC (SyntaxElement *sym, Bitstream *currStream)

int readSyntaxElement_Level_VLC0 (SyntaxElement *sym, Bitstream *currStream)

int readSyntaxElement_Level_VLCN (SyntaxElement *sym, int vlc, Bitstream *currStream)

int readSyntaxElement_TotalZeros (SyntaxElement *sym, Bitstream *currStream)

int readSyntaxElement_TotalZerosChromaDC (SyntaxElement *sym, Bitstream *currStream)

int readSyntaxElement_Run (SyntaxElement *sym, Bitstream *currStream)

int GetBits (byte buffer[], int totbitoffset, int *info, int bitcount, int numbits)

int ShowBits (byte buffer[], int totbitoffset, int bitcount, int numbits)

Variables

int UsedBits

static const byte NCBP [2][48][2]

const byte NTAB1 [4][8][2]

const byte LEVRUN1 [16]

const byte NTAB2 [4][8][2]

const byte LEVRUN3 [4]

const byte NTAB3 [2][2][2]

Detailed Description

VLC support functions.

Author:

Main contributors (see contributors.h for copyright, address and affiliation details)

Inge Lille-Lang�y <inge.lille-langoy@telenor.com>
Detlev Marpe <marpe@hhi.de>
Gabi Blaettermann

Definition in file vlc.c.

Function Documentation

int code_from_bitstream_2d	(	SyntaxElement *	sym,
		Bitstream *	currStream,
		const byte *	lentab,
		const byte *	codtab,
		int	tabwidth,
		int	tabheight,
		int *	code
	)

code from bitstream (2d tables)

Definition at line 641 of file vlc.c.

References Bitstream::frame_bitoffset, syntaxelement::len, ShowBitsThres(), Bitstream::streamBuffer, syntaxelement::value1, and syntaxelement::value2.

Referenced by readSyntaxElement_NumCoeffTrailingOnes(), readSyntaxElement_NumCoeffTrailingOnesChromaDC(), readSyntaxElement_Run(), readSyntaxElement_TotalZeros(), and readSyntaxElement_TotalZerosChromaDC().

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int GetBits	(	byte	buffer[],
		int	totbitoffset,
		int *	info,
		int	bitcount,
		int	numbits
	)

Reads bits from the bitstream buffer.

Parameters:

	buffer	containing VLC-coded data bits
	totbitoffset	bit offset from start of partition
	info	returns value of the read bits
	bitcount	total bytes in bitstream
	numbits	number of bits to read

Definition at line 1234 of file vlc.c.

Referenced by readIPCM_CABAC(), and readSyntaxElement_FLC().

int GetVLCSymbol	(	byte	buffer[],
		int	totbitoffset,
		int *	info,
		int	bytecount
	)

read one exp-golomb VLC symbol

Parameters:

	buffer	containing VLC-coded data bits
	totbitoffset	bit offset from start of partition
	info	returns the value of the symbol
	bytecount	buffer length

Returns:: bits read

Definition at line 557 of file vlc.c.

Referenced by readSyntaxElement_VLC().

int i_v	(	int	LenInBits,
		char *	tracestring,
		Bitstream *	bitstream
	)

i_v, reads an i(v) syntax element, the length in bits is stored in the global UsedBits variable

Parameters:

	LenInBits	length of the syntax element
	tracestring	the string for the trace file
	bitstream	the stream to be read from

Returns:: the value of the coded syntax element

Definition at line 200 of file vlc.c.

References syntaxelement::inf, syntaxelement::len, linfo_ue(), syntaxelement::mapping, readSyntaxElement_FLC(), SE_HEADER, and syntaxelement::type.

Referenced by interpret_picture_timing_info().

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void linfo_cbp_inter	(	int	len,
		int	info,
		int *	cbp,
		int *	dummy
	)

Input:: length and info

Output:: cbp (inter)

Definition at line 310 of file vlc.c.

References linfo_ue(), and NCBP.

Referenced by readCBPandCoeffsFromNAL().

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void linfo_cbp_intra	(	int	len,
		int	info,
		int *	cbp,
		int *	dummy
	)

Input:: length and info

Output:: cbp (intra)

Definition at line 290 of file vlc.c.

References linfo_ue(), and NCBP.

Referenced by readCBPandCoeffsFromNAL().

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void linfo_levrun_c2x2	(	int	len,
		int	info,
		int *	level,
		int *	irun
	)

Input:: length and info

Output:: level, run

Definition at line 364 of file vlc.c.

References LEVRUN3.

Referenced by readCBPandCoeffsFromNAL().

void linfo_levrun_inter	(	int	len,
		int	info,
		int *	level,
		int *	irun
	)

Input:: length and info

Output:: level, run

Definition at line 329 of file vlc.c.

References NTAB1.

Referenced by readCBPandCoeffsFromNAL(), and readCompCoeff4x4SMB_CABAC().

void linfo_se	(	int	len,
		int	info,
		int *	value1,
		int *	dummy
	)

mapping rule for se(v) syntax elements

Input:: lenght and info

Output:: signed mvd

Definition at line 271 of file vlc.c.

Referenced by readMotionInfoFromNAL(), and se_v().

void linfo_ue	(	int	len,
		int	info,
		int *	value1,
		int *	dummy
	)

mapping rule for ue(v) syntax elements

Input:: lenght and info

Output:: number in the code table

Definition at line 255 of file vlc.c.

Referenced by i_v(), linfo_cbp_inter(), linfo_cbp_intra(), prepareListforRefIdx(), read_ipred_modes(), read_one_macroblock(), u_v(), and ue_v().

int more_rbsp_data	(	byte	buffer[],
		int	totbitoffset,
		int	bytecount
	)

test if bit buffer contains only stop bit

Parameters:

	buffer	buffer containing VLC-coded data bits
	totbitoffset	bit offset from start of partition
	bytecount	buffer length

Returns:: true if more bits available

Definition at line 494 of file vlc.c.

Referenced by InterpretPPS(), and uvlc_startcode_follows().

int readSyntaxElement_FLC	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read FLC codeword from UVLC-partition

Definition at line 691 of file vlc.c.

References Bitstream::bitstream_length, Bitstream::frame_bitoffset, GetBits(), syntaxelement::inf, syntaxelement::len, Bitstream::streamBuffer, and syntaxelement::value1.

Referenced by i_v(), read_one_macroblock(), readCBPandCoeffsFromNAL(), readCoeff4x4_CAVLC(), readIPCMcoeffsFromNAL(), readRefPictureIdx_FLC(), and u_v().

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int readSyntaxElement_Intra4x4PredictionMode	(	SyntaxElement *	sym,
		ImageParameters *	img,
		Bitstream *	currStream
	)

read next VLC codeword for 4x4 Intra Prediction Mode and map it to the corresponding Intra Prediction Direction

Definition at line 431 of file vlc.c.

References Bitstream::bitstream_length, Bitstream::frame_bitoffset, syntaxelement::inf, syntaxelement::len, Bitstream::streamBuffer, TRACE, and syntaxelement::value1.

Referenced by read_ipred_modes().

int readSyntaxElement_Level_VLC0	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read Level VLC0 codeword from UVLC-partition

Definition at line 888 of file vlc.c.

References Bitstream::bitstream_length, Bitstream::frame_bitoffset, syntaxelement::inf, syntaxelement::len, ShowBits(), and Bitstream::streamBuffer.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_Level_VLCN	(	SyntaxElement *	sym,
		int	vlc,
		Bitstream *	currStream
	)

read Level VLC codeword from UVLC-partition

Definition at line 946 of file vlc.c.

References Bitstream::bitstream_length, Bitstream::frame_bitoffset, syntaxelement::inf, syntaxelement::len, ShowBits(), and Bitstream::streamBuffer.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_NumCoeffTrailingOnes	(	SyntaxElement *	sym,
		Bitstream *	currStream,
		char *	type
	)

read NumCoeff/TrailingOnes codeword from UVLC-partition

Definition at line 717 of file vlc.c.

References Bitstream::bitstream_length, code_from_bitstream_2d(), Bitstream::frame_bitoffset, syntaxelement::len, ShowBits(), Bitstream::streamBuffer, syntaxelement::value1, and syntaxelement::value2.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_NumCoeffTrailingOnesChromaDC	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read NumCoeff/TrailingOnes codeword from UVLC-partition ChromaDC

Definition at line 821 of file vlc.c.

References code_from_bitstream_2d(), syntaxelement::len, syntaxelement::value1, and syntaxelement::value2.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_Run	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read Run codeword from UVLC-partition

Definition at line 1175 of file vlc.c.

References code_from_bitstream_2d(), syntaxelement::len, and syntaxelement::value1.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_TotalZeros	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read Total Zeros codeword from UVLC-partition

Definition at line 1020 of file vlc.c.

References code_from_bitstream_2d(), syntaxelement::len, and syntaxelement::value1.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_TotalZerosChromaDC	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read Total Zeros Chroma DC codeword from UVLC-partition

Definition at line 1084 of file vlc.c.

References code_from_bitstream_2d(), syntaxelement::len, and syntaxelement::value1.

Referenced by readCoeff4x4_CAVLC().

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int readSyntaxElement_UVLC	(	SyntaxElement *	sym,
		ImageParameters *	img,
		struct datapartition *	dP
	)

read next UVLC codeword from UVLC-partition and map it to the corresponding syntax element

Definition at line 419 of file vlc.c.

References datapartition::bitstream, and readSyntaxElement_VLC().

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int readSyntaxElement_VLC	(	SyntaxElement *	sym,
		Bitstream *	currStream
	)

read next UVLC codeword from UVLC-partition and map it to the corresponding syntax element

Definition at line 394 of file vlc.c.

References Bitstream::bitstream_length, Bitstream::frame_bitoffset, GetVLCSymbol(), syntaxelement::inf, syntaxelement::len, syntaxelement::mapping, Bitstream::streamBuffer, syntaxelement::value1, and syntaxelement::value2.

Referenced by readSyntaxElement_UVLC(), se_v(), and ue_v().

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int se_v	(	char *	tracestring,
		Bitstream *	bitstream
	)

ue_v, reads an se(v) syntax element, the length in bits is stored in the global UsedBits variable

Parameters:

	tracestring	the string for the trace file
	bitstream	the stream to be read from

Returns:: the value of the coded syntax element

Definition at line 131 of file vlc.c.

References syntaxelement::len, linfo_se(), syntaxelement::mapping, readSyntaxElement_VLC(), SE_HEADER, syntaxelement::type, and syntaxelement::value1.

Referenced by interpret_film_grain_characteristics_info(), interpret_pan_scan_rect_info(), interpret_post_filter_hints_info(), InterpretPPS(), pred_weight_table(), and RestOfSliceHeader().

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int ShowBits	(	byte	buffer[],
		int	totbitoffset,
		int	bitcount,
		int	numbits
	)

Reads bits from the bitstream buffer.

Parameters:

	buffer	buffer containing VLC-coded data bits
	totbitoffset	bit offset from start of partition
	bitcount	total bytes in bitstream
	numbits	number of bits to read

Definition at line 1285 of file vlc.c.

Referenced by readSyntaxElement_Level_VLC0(), readSyntaxElement_Level_VLCN(), and readSyntaxElement_NumCoeffTrailingOnes().

static int ShowBitsThres	(	int	inf,
		int	numbits
	)			`[inline, static]`

Reads bits from the bitstream buffer (Threshold based).

Parameters:

	inf	bytes to extract numbits from with bitoffset already applied
	numbits	number of bits to read

Definition at line 615 of file vlc.c.

Referenced by code_from_bitstream_2d().

Boolean u_1	(	char *	tracestring,
		Bitstream *	bitstream
	)

ue_v, reads an u(1) syntax element, the length in bits is stored in the global UsedBits variable

Parameters:

	tracestring	the string for the trace file
	bitstream	the stream to be read from

Returns:: the value of the coded syntax element

Definition at line 238 of file vlc.c.

References u_v().

Referenced by dec_ref_pic_marking(), interpret_deblocking_filter_display_preference_info(), interpret_dec_ref_pic_marking_repetition_info(), interpret_film_grain_characteristics_info(), interpret_motion_constrained_slice_group_set_info(), interpret_pan_scan_rect_info(), interpret_picture_timing_info(), interpret_post_filter_hints_info(), interpret_recovery_point_info(), interpret_spare_pic(), interpret_stereo_video_info_info(), interpret_subsequence_characteristics_info(), interpret_subsequence_info(), interpret_subsequence_layer_characteristics_info(), InterpretPPS(), pred_weight_table(), ref_pic_list_reordering(), and RestOfSliceHeader().

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int u_v	(	int	LenInBits,
		char *	tracestring,
		Bitstream *	bitstream
	)

ue_v, reads an u(v) syntax element, the length in bits is stored in the global UsedBits variable

Parameters:

	LenInBits	length of the syntax element
	tracestring	the string for the trace file
	bitstream	the stream to be read from

Returns:: the value of the coded syntax element

Definition at line 165 of file vlc.c.

References syntaxelement::inf, syntaxelement::len, linfo_ue(), syntaxelement::mapping, readSyntaxElement_FLC(), SE_HEADER, and syntaxelement::type.

Referenced by FirstPartOfSliceHeader(), interpret_buffering_period_info(), interpret_film_grain_characteristics_info(), interpret_motion_constrained_slice_group_set_info(), interpret_picture_timing_info(), interpret_post_filter_hints_info(), interpret_recovery_point_info(), interpret_subsequence_characteristics_info(), interpret_subsequence_layer_characteristics_info(), InterpretPPS(), RestOfSliceHeader(), and u_1().

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int ue_v	(	char *	tracestring,
		Bitstream *	bitstream
	)

ue_v, reads an ue(v) syntax element, the length in bits is stored in the global UsedBits variable

Parameters:

	tracestring	the string for the trace file
	bitstream	the stream to be read from

Returns:: the value of the coded syntax element

Definition at line 100 of file vlc.c.

References syntaxelement::len, linfo_ue(), syntaxelement::mapping, readSyntaxElement_VLC(), SE_HEADER, syntaxelement::type, and syntaxelement::value1.

Referenced by dec_ref_pic_marking(), FirstPartOfSliceHeader(), interpret_buffering_period_info(), interpret_deblocking_filter_display_preference_info(), interpret_dec_ref_pic_marking_repetition_info(), interpret_film_grain_characteristics_info(), interpret_full_frame_freeze_info(), interpret_full_frame_snapshot_info(), interpret_motion_constrained_slice_group_set_info(), interpret_pan_scan_rect_info(), interpret_post_filter_hints_info(), interpret_progressive_refinement_end_info(), interpret_progressive_refinement_start_info(), interpret_recovery_point_info(), interpret_scene_information(), interpret_spare_pic(), interpret_subsequence_characteristics_info(), interpret_subsequence_info(), interpret_subsequence_layer_characteristics_info(), InterpretPPS(), pred_weight_table(), read_new_slice(), ref_pic_list_reordering(), and RestOfSliceHeader().

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int uvlc_startcode_follows	(	Slice *	currSlice,
		int	dummy
	)

Check if there are symbols for the next MB.

Definition at line 528 of file vlc.c.

References assignSE2partition, datapartition::bitstream, Bitstream::bitstream_length, Slice::dp_mode, Bitstream::frame_bitoffset, more_rbsp_data(), Slice::partArr, and Bitstream::streamBuffer.

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Variable Documentation

const byte LEVRUN1[16]

Initial value:

{
  4,2,2,1,1,1,1,1,1,1,0,0,0,0,0,0,
}

Definition at line 58 of file vlc.c.

const byte LEVRUN3[4]

Initial value:

{
  2,1,0,0
}

for the linfo_levrun__c2x2 routine

Definition at line 73 of file vlc.c.

Referenced by linfo_levrun_c2x2().

const byte NCBP[2][48][2] [static]

Initial value:

{
  {  
    {15, 0},{ 0, 1},{ 7, 2},{11, 4},{13, 8},{14, 3},{ 3, 5},{ 5,10},{10,12},{12,15},{ 1, 7},{ 2,11},
    { 4,13},{ 8,14},{ 6, 6},{ 9, 9},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},
    { 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},
    { 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0},{ 0, 0}
  },
  {
    {47, 0},{31,16},{15, 1},{ 0, 2},{23, 4},{27, 8},{29,32},{30, 3},{ 7, 5},{11,10},{13,12},{14,15},
    {39,47},{43, 7},{45,11},{46,13},{16,14},{ 3, 6},{ 5, 9},{10,31},{12,35},{19,37},{21,42},{26,44},
    {28,33},{35,34},{37,36},{42,40},{44,39},{ 1,43},{ 2,45},{ 4,46},{ 8,17},{17,18},{18,20},{20,24},
    {24,19},{ 6,21},{ 9,26},{22,28},{25,23},{32,27},{33,29},{34,30},{36,22},{40,25},{38,38},{41,41}
  }
}

gives CBP value from codeword number, both for intra and inter

Definition at line 34 of file vlc.c.

Referenced by linfo_cbp_inter(), and linfo_cbp_intra().

const byte NTAB1[4][8][2]

Initial value:

{
  {{1,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}},
  {{1,1},{1,2},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}},
  {{2,0},{1,3},{1,4},{1,5},{0,0},{0,0},{0,0},{0,0}},
  {{3,0},{2,1},{2,2},{1,6},{1,7},{1,8},{1,9},{4,0}},
}

for the linfo_levrun_inter routine

Definition at line 51 of file vlc.c.

Referenced by linfo_levrun_inter().

const byte NTAB2[4][8][2]

Initial value:

{
  {{1,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}},
  {{1,1},{2,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}},
  {{1,2},{3,0},{4,0},{5,0},{0,0},{0,0},{0,0},{0,0}},
  {{1,3},{1,4},{2,1},{3,1},{6,0},{7,0},{8,0},{9,0}},
}

Definition at line 64 of file vlc.c.

const byte NTAB3[2][2][2]

Initial value:

{
  {{1,0},{0,0}},
  {{2,0},{1,1}},
}

Definition at line 77 of file vlc.c.


Defines
#define	SYMTRACESTRING(s)
Functions
int	ue_v (char tracestring, Bitstream bitstream)
int	se_v (char tracestring, Bitstream bitstream)
int	u_v (int LenInBits, char tracestring, Bitstream bitstream)
int	i_v (int LenInBits, char tracestring, Bitstream bitstream)
Boolean	u_1 (char tracestring, Bitstream bitstream)
void	linfo_ue (int len, int info, int value1, int dummy)
void	linfo_se (int len, int info, int value1, int dummy)
void	linfo_cbp_intra (int len, int info, int cbp, int dummy)
void	linfo_cbp_inter (int len, int info, int cbp, int dummy)
void	linfo_levrun_inter (int len, int info, int level, int irun)
void	linfo_levrun_c2x2 (int len, int info, int level, int irun)
int	readSyntaxElement_VLC (SyntaxElement sym, Bitstream currStream)
int	readSyntaxElement_UVLC (SyntaxElement sym, ImageParameters img, struct datapartition *dP)
int	readSyntaxElement_Intra4x4PredictionMode (SyntaxElement sym, ImageParameters img, Bitstream *currStream)
int	GetVLCSymbol_IntraMode (byte buffer[], int totbitoffset, int *info, int bytecount)
int	more_rbsp_data (byte buffer[], int totbitoffset, int bytecount)
int	uvlc_startcode_follows (Slice *currSlice, int dummy)
int	GetVLCSymbol (byte buffer[], int totbitoffset, int *info, int bytecount)
static int	ShowBitsThres (int inf, int numbits)
int	code_from_bitstream_2d (SyntaxElement sym, Bitstream currStream, const byte lentab, const byte codtab, int tabwidth, int tabheight, int *code)
int	readSyntaxElement_FLC (SyntaxElement sym, Bitstream currStream)
int	readSyntaxElement_NumCoeffTrailingOnes (SyntaxElement sym, Bitstream currStream, char *type)
int	readSyntaxElement_NumCoeffTrailingOnesChromaDC (SyntaxElement sym, Bitstream currStream)
int	readSyntaxElement_Level_VLC0 (SyntaxElement sym, Bitstream currStream)
int	readSyntaxElement_Level_VLCN (SyntaxElement sym, int vlc, Bitstream currStream)
int	readSyntaxElement_TotalZeros (SyntaxElement sym, Bitstream currStream)
int	readSyntaxElement_TotalZerosChromaDC (SyntaxElement sym, Bitstream currStream)
int	readSyntaxElement_Run (SyntaxElement sym, Bitstream currStream)
int	GetBits (byte buffer[], int totbitoffset, int *info, int bitcount, int numbits)
int	ShowBits (byte buffer[], int totbitoffset, int bitcount, int numbits)
Variables
int	UsedBits
static const byte	NCBP [2][48][2]
const byte	NTAB1 [4][8][2]
const byte	LEVRUN1 [16]
const byte	NTAB2 [4][8][2]
const byte	LEVRUN3 [4]
const byte	NTAB3 [2][2][2]