block.h File Reference

definitions for block decoding functions More...

#include "global.h"
#include "transform8x8.h"

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Functions
void	iMBtrans4x4 (ImageParameters *img, Macroblock *currMB, ColorPlane pl, int smb)
void	iMBtrans8x8 (ImageParameters *img, Macroblock *currMB, ColorPlane pl)
void	itrans_sp_cr (ImageParameters *img, int uv)
void	intrapred_chroma (ImageParameters *img, Macroblock *currMB, int uv)
void	Inv_Residual_trans_4x4 (ImageParameters *img, ColorPlane pl, int ioff, int joff)
void	Inv_Residual_trans_8x8 (ImageParameters *img, Macroblock *currMB, ColorPlane pl, int ioff, int joff)
void	itrans4x4 (ImageParameters *img, ColorPlane pl, int ioff, int joff)
void	itrans4x4_ls (ImageParameters *img, ColorPlane pl, int ioff, int joff)
void	itrans_sp (ImageParameters *img, ColorPlane pl, int ioff, int joff)
int	intrapred (ImageParameters *img, Macroblock *currMB, ColorPlane pl, int ioff, int joff, int i4, int j4)
void	itrans_2 (ImageParameters *img, Macroblock *currMB, ColorPlane pl)
void	iTransform (ImageParameters *img, Macroblock *currMB, ColorPlane pl, int need_4x4_transform, int smb)
int	allocate_block_mem (void)
void	free_block_mem (void)
Variables
const byte	QP_SCALE_CR [52]
const unsigned char	subblk_offset_x [3][8][4]
const unsigned char	subblk_offset_y [3][8][4]
void(*	itrans_4x4 )(ImageParameters *img, ColorPlane pl, int ioff, int joff)
void(*	itrans_8x8 )(ImageParameters *img, Macroblock *currMB, ColorPlane pl, int ioff, int joff)

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Detailed Description

definitions for block decoding functions

Author:

Inge Lille-Langoy <inge.lille-langoy@telenor.com>
Telenor Satellite Services
P.O.Box 6914 St.Olavs plass
N-0130 Oslo, Norway

Definition in file block.h.

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Function Documentation

int intrapred	(	ImageParameters *	img,
		Macroblock *	currMB,
		ColorPlane	pl,
		int	ioff,
		int	joff,
		int	img_block_x,
		int	img_block_y
	)

makes and returns 4x4 intra prediction blocks

Returns:

DECODING_OK decoding of intraprediction mode was sucessfull
SEARCH_SYNC search next sync element as errors while decoding occured

Parameters:

img	image parameters
currMB	current macroblock
pl	current image plane
ioff	pixel offset X within MB
joff	pixel offset Y within MB
img_block_x	location of block X, multiples of 4
img_block_y	location of block Y, multiples of 4

Definition at line 762 of file intra4x4_pred.c.

Referenced by decode_one_component().

void intrapred_chroma	(	ImageParameters *	img,
		Macroblock *	currMB,
		int	uv
	)

Chroma Intra prediction. Note that many operations can be moved outside since they are repeated for both components for no reason.

< pixel position p(0,-1)

< pixel positions p(-1, -1..16)

Definition at line 94 of file block.c.

References macroblock::c_ipred_mode, storable_picture::chroma_format_idc, error(), storable_picture::imgUV, and subblk_offset_x.

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void Inv_Residual_trans_4x4	(	ImageParameters *	img,
		ColorPlane	pl,
		int	ioff,
		int	joff
	)

Inverse residual DPCM for Intra lossless coding.

Parameters:

img	image parameters
pl	used color plane
ioff	index to 4x4 block
joff	index to 4x4 block

Definition at line 315 of file block.c.

Referenced by decode_one_component().

void Inv_Residual_trans_8x8	(	ImageParameters *	img,
		Macroblock *	currMB,
		ColorPlane	pl,
		int	ioff,
		int	joff
	)

Inverse residual DPCM for Intra lossless coding.

Input:

ioff_x,joff_y: Block position inside a macro block (0,8).

Definition at line 389 of file block.c.

Referenced by decode_one_component().

void itrans4x4	(	ImageParameters *	img,
		ColorPlane	pl,
		int	ioff,
		int	joff
	)

Inverse 4x4 transformation, transforms cof to mb_rres.

Parameters:

img	image parameters
pl	used color plane
ioff	index to 4x4 block
joff	index to 4x4 block

Definition at line 254 of file block.c.

Referenced by decode_one_component().

void itrans4x4_ls	(	ImageParameters *	img,
		ColorPlane	pl,
		int	ioff,
		int	joff
	)

Inverse 4x4 lossless_qpprime transformation, transforms cof to mb_rres.

Parameters:

img	image parameters
pl	Color plane (for 4:4:4)
ioff	index to 4x4 block
joff	index to 4x4 block

Definition at line 284 of file block.c.

void itrans_2	(	ImageParameters *	img,
		Macroblock *	currMB,
		ColorPlane	pl
	)

Luma DC inverse transform.

Parameters:

img	image parameters
currMB	current macroblock
pl	used color plane

Definition at line 465 of file block.c.

References macroblock::qp_scaled.

Referenced by readCBPandCoeffsFromNAL().

void itrans_sp	(	ImageParameters *	img,
		ColorPlane	pl,
		int	ioff,
		int	joff
	)

Parameters:

img	image parameters
pl	used color plane
ioff	index to 4x4 block
joff	index to 4x4 block

Definition at line 502 of file block.c.

References dequant_coef.

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Variable Documentation

const unsigned char subblk_offset_x[3][8][4]

look up tables for FRExt_chroma support

Definition at line 130 of file macroblock.c.

Referenced by buildPredblockRegionYUV(), buildPredRegionYUV(), intrapred_chroma(), and readCBPandCoeffsFromNAL().