erc_do.h File Reference

Header for the I & P frame error concealment common functions. More...

#include "erc_api.h"

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Defines
#define	isSplitted(object_list, currMBNum)   ((object_list+((currMBNum)<<2))->regionMode >= REGMODE_SPLITTED)
#define	isBlock(object_list, currMBNum, comp, regMode)
#define	getParam(object_list, currMBNum, comp, param)
Functions
void	ercPixConcealIMB (ImageParameters *p_Img, imgpel *currFrame, int row, int column, int predBlocks[], int frameWidth, int mbWidthInBlocks)
int	ercCollect8PredBlocks (int predBlocks[], int currRow, int currColumn, int *condition, int maxRow, int maxColumn, int step, byte fNoCornerNeigh)
int	ercCollectColumnBlocks (int predBlocks[], int currRow, int currColumn, int *condition, int maxRow, int maxColumn, int step)

---

Detailed Description

Header for the I & P frame error concealment common functions.

Author:

• Viktor Varsa <viktor.varsa@nokia.com>
• Ye-Kui Wang <wyk@ieee.org>

Definition in file erc_do.h.

---

Define Documentation

#define getParam	(	object_list,
		currMBNum,
		comp,
		param		)

Value:

(isSplitted(object_list,currMBNum) ? \
     ((object_list+((currMBNum)<<2)+(comp))->param) : \
     ((object_list+((currMBNum)<<2))->param))

Definition at line 38 of file erc_do.h.

#define isBlock	(	object_list,
		currMBNum,
		comp,
		regMode		)

Value:

(isSplitted(object_list,currMBNum) ? \
     ((object_list+((currMBNum)<<2)+(comp))->regionMode == REGMODE_##regMode##_8x8) : \
     ((object_list+((currMBNum)<<2))->regionMode == REGMODE_##regMode))

Definition at line 32 of file erc_do.h.

---

Function Documentation

int ercCollect8PredBlocks	(	int	predBlocks[],
		int	currRow,
		int	currColumn,
		int *	condition,
		int	maxRow,
		int	maxColumn,
		int	step,
		byte	fNoCornerNeigh
	)

This function checks the neighbors of a Macroblock for usability in concealment. First the OK macroblocks are marked, and if there is not enough of them, then the CONCEALED ones as well. A "1" in the the output array means reliable, a "0" non reliable MB. The block order in "predBlocks": 1 4 0 5 x 7 2 6 3 i.e., corners first.

Returns:

Number of useable neighbor macroblocks for concealment.

Parameters:

	predBlocks[]	Array for indicating the valid neighbor blocks
	currRow	Current block row in the frame
	currColumn	Current block column in the frame
	condition	The block condition (ok, lost) table
	maxRow	Number of block rows in the frame
	maxColumn	Number of block columns in the frame
	step	Number of blocks belonging to a MB, when counting in vertical/horizontal direction. (Y:2 U,V:1)
	fNoCornerNeigh	No corner neighbors are considered

Definition at line 154 of file erc_do_i.c.

Referenced by concealBlocks(), and ercConcealInterFrame().

int ercCollectColumnBlocks	(	int	predBlocks[],
		int	currRow,
		int	currColumn,
		int *	condition,
		int	maxRow,
		int	maxColumn,
		int	step
	)

collects prediction blocks only from the current column

Returns:

Number of usable neighbour Macroblocks for concealment.

Parameters:

	predBlocks[]	Array for indicating the valid neighbor blocks
	currRow	Current block row in the frame
	currColumn	Current block column in the frame
	condition	The block condition (ok, lost) table
	maxRow	Number of block rows in the frame
	maxColumn	Number of block columns in the frame
	step	Number of blocks belonging to a MB, when counting in vertical/horizontal direction. (Y:2 U,V:1)

Definition at line 263 of file erc_do_i.c.

Referenced by concealBlocks().

void ercPixConcealIMB	(	ImageParameters *	p_Img,
		imgpel *	currFrame,
		int	row,
		int	column,
		int	predBlocks[],
		int	frameWidth,
		int	mbWidthInBlocks
	)

Conceals the MB at position (row, column) using pixels from predBlocks[] using pixMeanInterpolateBlock().

Parameters:

	p_Img	image encoding parameters for current picture
	currFrame	current frame
	row	y coordinate in blocks
	column	x coordinate in blocks
	predBlocks[]	list of neighboring source blocks (numbering 0 to 7, 1 means: use the neighbor)
	frameWidth	width of frame in pixels
	mbWidthInBlocks	2 for Y, 1 for U/V components

Definition at line 94 of file erc_do_i.c.

References pixMeanInterpolateBlock().

Referenced by concealBlocks().

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