HpelDSPContext Struct Reference

Half-pel DSP context. More...

#include <hpeldsp.h>

Data Fields
op_pixels_func	put_pixels_tab [4][4]
	Halfpel motion compensation with rounding (a+b+1)>>1. More...
op_pixels_func	avg_pixels_tab [4][4]
	Halfpel motion compensation with rounding (a+b+1)>>1. More...
op_pixels_func	put_no_rnd_pixels_tab [3][4]
	Halfpel motion compensation with no rounding (a+b)>>1. More...
op_pixels_func	avg_no_rnd_pixels_tab [4]
	Halfpel motion compensation with no rounding (a+b)>>1. More...

Detailed Description

Half-pel DSP context.

Definition at line 46 of file hpeldsp.h.

Field Documentation

put_pixels_tab

op_pixels_func HpelDSPContext::put_pixels_tab[4][4]

Halfpel motion compensation with rounding (a+b+1)>>1.

this is an array[4][4] of motion compensation functions for 4 horizontal blocksizes (2,4,8,16) and the 4 halfpel positions
*pixels_tab[ 0->16xH 1->8xH 2->4xH 3->2xH ][ xhalfpel + 2*yhalfpel ]

Parameters

block	destination where the result is stored
pixels	source
line_size	number of bytes in a horizontal line of block
h	height

Definition at line 57 of file hpeldsp.h.

Referenced by decode_init(), mxpeg_decode_init(), svq1_encode_plane(), svq1_motion_inter_4v_block(), and svq1_motion_inter_block().

avg_pixels_tab

op_pixels_func HpelDSPContext::avg_pixels_tab[4][4]

Halfpel motion compensation with rounding (a+b+1)>>1.

This is an array[4][4] of motion compensation functions for 4 horizontal blocksizes (2,4,8,16) and the 4 halfpel positions
*pixels_tab[ 0->16xH 1->8xH 2->4xH 3->2xH ][ xhalfpel + 2*yhalfpel ]

Parameters

block	destination into which the result is averaged (a+b+1)>>1
pixels	source
line_size	number of bytes in a horizontal line of block
h	height

Definition at line 69 of file hpeldsp.h.

put_no_rnd_pixels_tab

op_pixels_func HpelDSPContext::put_no_rnd_pixels_tab[3][4]

Halfpel motion compensation with no rounding (a+b)>>1.

this is an array[4][4] of motion compensation functions for 2 horizontal blocksizes (8,16) and the 4 halfpel positions
*pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]

Parameters

block	destination where the result is stored
pixels	source
line_size	number of bytes in a horizontal line of block
h	height

Note

The size is kept at [3][4] to avoid out of bounds accesses in the motion estimation code.

Definition at line 83 of file hpeldsp.h.

avg_no_rnd_pixels_tab

op_pixels_func HpelDSPContext::avg_no_rnd_pixels_tab[4]

Halfpel motion compensation with no rounding (a+b)>>1.

this is an array[4] of motion compensation functions for 1 horizontal blocksize (16) and the 4 halfpel positions
*pixels_tab[ xhalfpel + 2*yhalfpel ]

Parameters

block	destination into which the result is averaged (a+b)>>1
pixels	source
line_size	number of bytes in a horizontal line of block
h	height

Definition at line 95 of file hpeldsp.h.

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The documentation for this struct was generated from the following file:

• libavcodec/hpeldsp.h