mirror of
https://github.com/game-stop/veejay.git
synced 2025-12-19 14:19:58 +01:00
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
|
|
*
|
|
* mblock_sub44_sads_x86_h.c
|
|
* Copyright (C) 2000 Andrew Stevens <as@comlab.ox.ac.uk>
|
|
*
|
|
* Fast block sum-absolute difference computation for a rectangular area 4*x
|
|
* by y where y > h against a 4 by h block.
|
|
*
|
|
* Used for 4*4 sub-sampled motion compensation calculations.
|
|
*
|
|
*
|
|
* This file is part of mpeg2enc, a free MPEG-2 video stream encoder
|
|
* based on the original MSSG reference design
|
|
*
|
|
* mpeg2enc is free software; you can redistribute new parts
|
|
* and/or modify under the terms of the GNU General Public License
|
|
* as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* mpeg2enc is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* See the files for those sections (c) MSSG
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/*
|
|
*
|
|
* Generates a vector sad's for 4*4 sub-sampled pel (qpel) data (with
|
|
* co-ordinates and top-left qpel address) from specified rectangle
|
|
* against a specified 16*h pel (4*4 qpel) reference block. The
|
|
* generated vector contains results only for those sad's that fall
|
|
* below twice the running best sad and are aligned on 8-pel
|
|
* boundaries
|
|
*
|
|
* Invariant: blk points to top-left sub-sampled pel for macroblock
|
|
* at (ilow,ihigh)
|
|
* i{low,high) j(low,high) must be multiples of 4.
|
|
*
|
|
* sad = Sum Absolute Differences
|
|
*
|
|
* NOTES: for best efficiency i{low,high) should be multiples of 16.
|
|
*
|
|
* */
|
|
|
|
int SIMD_SUFFIX(mblocks_sub44_mests)( uint8_t *blk, uint8_t *ref,
|
|
int ilow,int jlow,
|
|
int ihigh, int jhigh,
|
|
int h, int rowstride,
|
|
int threshold,
|
|
me_result_s *resvec)
|
|
{
|
|
int32_t x,y;
|
|
uint8_t *currowblk = blk;
|
|
uint8_t *curblk;
|
|
me_result_s *cres = resvec;
|
|
int gridrowstride = (rowstride);
|
|
int weight;
|
|
|
|
for( y=jlow; y <= jhigh ; y+=4)
|
|
{
|
|
curblk = currowblk;
|
|
for( x = ilow; x <= ihigh; x += 4)
|
|
{
|
|
if( (x & 15) == (ilow & 15) )
|
|
{
|
|
load_blk( curblk, rowstride, h );
|
|
}
|
|
weight = SIMD_SUFFIX(qblock_sad)(ref, h, rowstride);
|
|
if( weight <= threshold )
|
|
{
|
|
threshold = intmin(weight<<2,threshold);
|
|
/* Rough and-ready absolute distance penalty */
|
|
/* NOTE: This penalty is *vital* to correct operation
|
|
as otherwise the sub-mean filtering won't work on very
|
|
uniform images.
|
|
*/
|
|
cres->weight = (uint16_t)(weight+(intmax(intabs(x),intabs(y))<<2));
|
|
cres->x = (uint8_t)x;
|
|
cres->y = (uint8_t)y;
|
|
++cres;
|
|
}
|
|
curblk += 1;
|
|
shift_blk(8);
|
|
}
|
|
currowblk += gridrowstride;
|
|
}
|
|
emms();
|
|
return cres - resvec;
|
|
}
|
|
|
|
#undef concat
|