cabac.h File Reference

Header file for entropy coding routines. More...

#include "global.h"

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Functions
MotionInfoContexts *	create_contexts_MotionInfo (void)
TextureInfoContexts *	create_contexts_TextureInfo (void)
void	delete_contexts_MotionInfo (MotionInfoContexts *enco_ctx)
void	delete_contexts_TextureInfo (TextureInfoContexts *enco_ctx)
void	cabac_new_slice (void)
void	readMB_typeInfo_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readB8_typeInfo_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readIntraPredMode_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readRefFrame_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readMVD_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readCBP_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readRunLevel_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readDquant_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readCIPredMode_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readMB_skip_flagInfo_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readFieldModeInfo_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readMB_transform_size_flag_CABAC (Macroblock *currMB, SyntaxElement *se, ImageParameters *img, DecodingEnvironmentPtr dep_dp)
void	readIPCM_CABAC (struct datapartition *dP)
int	cabac_startcode_follows (Slice *currSlice, int eos_bit)
int	readSyntaxElement_CABAC (SyntaxElement *se, ImageParameters *img, DataPartition *this_dataPart)
int	check_next_mb_and_get_field_mode_CABAC (SyntaxElement *se, ImageParameters *img, DataPartition *act_dp)
void	CheckAvailabilityOfNeighborsCABAC (Macroblock *currMB)

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Detailed Description

Header file for entropy coding routines.

cabac.h

Author:

Detlev Marpe
Copyright (C) 2000 HEINRICH HERTZ INSTITUTE All Rights Reserved.

Date:

21. Oct 2000 (Changes by Tobias Oelbaum 28.08.2001)

Definition in file cabac.h.

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Function Documentation

int cabac_startcode_follows	(	Slice *	currSlice,
		int	eos_bit
	)

finding end of a slice in case this is not the end of a frame

Unsure whether the "correction" below actually solves an off-by-one problem or whether it introduces one in some cases :-( Anyway, with this change the bit stream format works with CABAC again. StW, 8.7.02

Definition at line 1627 of file cabac.c.

References assignSE2partition, biari_decode_final(), datapartition::de_cabac, Slice::dp_mode, and Slice::partArr.

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MotionInfoContexts* create_contexts_MotionInfo

(

void

)

Allocation of contexts models for the motion info used for arithmetic decoding.

Definition at line 81 of file cabac.c.

References no_mem_exit().

Referenced by malloc_slice().

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TextureInfoContexts* create_contexts_TextureInfo

(

void

)

Allocates of contexts models for the texture info used for arithmetic decoding.

Definition at line 100 of file cabac.c.

References no_mem_exit().

Referenced by malloc_slice().

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void delete_contexts_MotionInfo

(

MotionInfoContexts *

enco_ctx

)

Frees the memory of the contexts models used for arithmetic decoding of the motion info.

Definition at line 121 of file cabac.c.

Referenced by free_slice().

void delete_contexts_TextureInfo

(

TextureInfoContexts *

enco_ctx

)

Frees the memory of the contexts models used for arithmetic decoding of the texture info.

Definition at line 137 of file cabac.c.

Referenced by free_slice().

void readB8_typeInfo_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the 8x8 block type.

Definition at line 337 of file cabac.c.

References biari_decode_symbol(), and syntaxelement::value1.

Referenced by read_one_macroblock().

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void readCBP_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the coded block pattern of a given MB.

Definition at line 907 of file cabac.c.

References biari_decode_symbol(), macroblock::cbp, storable_picture::chroma_format_idc, get4x4Neighbour(), macroblock::mb_available_left, macroblock::mb_available_up, macroblock::mb_type, syntaxelement::value1, YUV400, and YUV444.

Referenced by readCBPandCoeffsFromNAL().

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void readCIPredMode_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the chroma intra prediction mode of a given MB.

Definition at line 1039 of file cabac.c.

References biari_decode_symbol(), macroblock::c_ipred_mode, macroblock::mb_available_left, macroblock::mb_available_up, macroblock::mb_type, unary_bin_max_decode(), and syntaxelement::value1.

Referenced by read_ipred_modes().

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void readDquant_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the delta qp of a given MB.

Definition at line 872 of file cabac.c.

References biari_decode_symbol(), unary_bin_decode(), and syntaxelement::value1.

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void readIntraPredMode_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode a pair of intra prediction modes of a given MB.

Definition at line 765 of file cabac.c.

References biari_decode_symbol(), and syntaxelement::value1.

Referenced by read_ipred_modes().

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void readIPCM_CABAC

(

struct datapartition *

dP

)

Read I_PCM macroblock.

Definition at line 1766 of file cabac.c.

References datapartition::bitstream, Bitstream::bitstream_length, storable_picture::chroma_format_idc, DecodingEnvironment::DbitsLeft, DecodingEnvironment::Dcodestrm_len, datapartition::de_cabac, DecodingEnvironment::Dvalue, GetBits(), Bitstream::streamBuffer, and YUV400.

Referenced by readIPCMcoeffsFromNAL().

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void readMB_skip_flagInfo_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the macroblock type info of a given MB.

Definition at line 421 of file cabac.c.

References biari_decode_symbol(), macroblock::mb_available_left, macroblock::mb_available_up, macroblock::skip_flag, syntaxelement::value1, and syntaxelement::value2.

Referenced by read_one_macroblock().

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void readMB_transform_size_flag_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the macroblock intra_pred_size flag info of a given MB.

Definition at line 470 of file cabac.c.

References biari_decode_symbol(), macroblock::luma_transform_size_8x8_flag, macroblock::mb_available_left, macroblock::mb_available_up, and syntaxelement::value1.

Referenced by read_one_macroblock(), and readCBPandCoeffsFromNAL().

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void readMB_typeInfo_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the macroblock type info of a given MB.

Definition at line 499 of file cabac.c.

References biari_decode_final(), biari_decode_symbol(), syntaxelement::context, macroblock::mb_available_left, macroblock::mb_available_up, macroblock::mb_type, and syntaxelement::value1.

Referenced by read_one_macroblock().

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void readMVD_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the motion vector data of a B-frame MB.

Definition at line 254 of file cabac.c.

References biari_decode_symbol(), biari_decode_symbol_eq_prob(), syntaxelement::context, get4x4Neighbour(), macroblock::mb_field, unary_exp_golomb_mv_decode(), syntaxelement::value1, and syntaxelement::value2.

Referenced by readMotionInfoFromNAL().

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void readRefFrame_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

This function is used to arithmetically decode the reference parameter of a given MB.

Definition at line 799 of file cabac.c.

References macroblock::b8mode, macroblock::b8pdir, biari_decode_symbol(), syntaxelement::context, get4x4Neighbour(), macroblock::mb_field, macroblock::mb_type, storable_picture::motion, pic_motion_params::ref_idx, unary_bin_decode(), syntaxelement::value1, and syntaxelement::value2.

Referenced by prepareListforRefIdx().

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void readRunLevel_CABAC	(	Macroblock *	currMB,
		SyntaxElement *	se,
		ImageParameters *	img,
		DecodingEnvironmentPtr	dep_dp
	)

Read Block-Transform Coefficients.

Definition at line 1479 of file cabac.c.

References syntaxelement::context, read_and_store_CBP_block_bit(), read_significance_map(), read_significant_coefficients(), syntaxelement::value1, and syntaxelement::value2.

Referenced by readCBPandCoeffsFromNAL(), readCompCoeff4x4SMB_CABAC(), and readCompCoeff8x8_CABAC().

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int readSyntaxElement_CABAC	(	SyntaxElement *	se,
		ImageParameters *	img,
		DataPartition *	this_dataPart
	)

arithmetic decoding

Definition at line 1529 of file cabac.c.

References arideco_bits_read(), datapartition::de_cabac, syntaxelement::len, and syntaxelement::reading.

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