2007-05-13 19:22:32 +00:00
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/*
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* Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
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* April 20, 2007
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*
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2008-07-04 13:49:45 +00:00
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* Blackfin video color space converter operations
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* convert I420 YV12 to RGB in various formats
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2007-05-13 19:22:32 +00:00
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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2008-07-04 13:49:45 +00:00
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YUV420 to RGB565 conversion. This routine takes a YUV 420 planar macroblock
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and converts it to RGB565. R:5 bits, G:6 bits, B:5 bits.. packed into shorts.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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The following calculation is used for the conversion:
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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r = clipz((y-oy)*cy + crv*(v-128))
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g = clipz((y-oy)*cy + cgv*(v-128) + cgu*(u-128))
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b = clipz((y-oy)*cy + cbu*(u-128))
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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y,u,v are prescaled by a factor of 4 i.e. left-shifted to gain precision.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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New factorization to eliminate the truncation error which was
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2008-07-04 13:49:45 +00:00
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occurring due to the byteop3p.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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1) Use the bytop16m to subtract quad bytes we use this in U8 this
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2008-07-04 13:14:29 +00:00
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then so the offsets need to be renormalized to 8bits.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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2) Scale operands up by a factor of 4 not 8 because Blackfin
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2008-07-04 13:14:29 +00:00
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multiplies include a shift.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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3) Compute into the accumulators cy*yx0, cy*yx1.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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4) Compute each of the linear equations:
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2008-07-04 13:14:29 +00:00
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r = clipz((y - oy) * cy + crv * (v - 128))
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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g = clipz((y - oy) * cy + cgv * (v - 128) + cgu * (u - 128))
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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b = clipz((y - oy) * cy + cbu * (u - 128))
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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Reuse of the accumulators requires that we actually multiply
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twice once with addition and the second time with a subtraction.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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Because of this we need to compute the equations in the order R B
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2008-07-04 13:14:29 +00:00
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then G saving the writes for B in the case of 24/32 bit color
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formats.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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API: yuv2rgb_kind (uint8_t *Y, uint8_t *U, uint8_t *V, int *out,
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2008-07-04 13:14:29 +00:00
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int dW, uint32_t *coeffs);
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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A B
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--- ---
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i2 = cb i3 = cr
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i1 = coeff i0 = y
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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Where coeffs have the following layout in memory.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv;
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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coeffs is a pointer to oy.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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The {rgb} masks are only utilized by the 565 packing algorithm. Note the data
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replication is used to simplify the internal algorithms for the dual Mac
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architecture of BlackFin.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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All routines are exported with _ff_bfin_ as a symbol prefix.
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:49:45 +00:00
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Rough performance gain compared against -O3:
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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2779809/1484290 187.28%
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2007-05-13 19:22:32 +00:00
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2008-07-04 13:14:29 +00:00
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which translates to ~33c/pel to ~57c/pel for the reference vs 17.5
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c/pel for the optimized implementations. Not sure why there is such a
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huge variation on the reference codes on Blackfin I guess it must have
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to do with the memory system.
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2007-05-13 19:22:32 +00:00
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*/
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#define mL3 .text
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2008-02-16 15:17:59 +00:00
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#ifdef __FDPIC__
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#define mL1 .l1.text
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#else
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#define mL1 mL3
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#endif
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2007-05-13 19:22:32 +00:00
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#define MEM mL1
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#define DEFUN(fname,where,interface) \
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.section where; \
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.global _ff_bfin_ ## fname; \
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.type _ff_bfin_ ## fname, STT_FUNC; \
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.align 8; \
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_ff_bfin_ ## fname
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#define DEFUN_END(fname) \
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.size _ff_bfin_ ## fname, . - _ff_bfin_ ## fname
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.text
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#define COEFF_LEN 11*4
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#define COEFF_REL_CY_OFF 4*4
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#define ARG_OUT 20
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#define ARG_W 24
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#define ARG_COEFF 28
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DEFUN(yuv2rgb565_line,MEM,
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(uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
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link 0;
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[--sp] = (r7:4);
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p1 = [fp+ARG_OUT];
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r3 = [fp+ARG_W];
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i0 = r0;
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i2 = r1;
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i3 = r2;
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r0 = [fp+ARG_COEFF];
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i1 = r0;
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b1 = i1;
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l1 = COEFF_LEN;
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m0 = COEFF_REL_CY_OFF;
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p0 = r3;
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r0 = [i0++]; // 2Y
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r1.l = w[i2++]; // 2u
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r1.h = w[i3++]; // 2v
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p0 = p0>>2;
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lsetup (.L0565, .L1565) lc0 = p0;
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/*
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uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
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r0 -- used to load 4ys
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r1 -- used to load 2us,2vs
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r4 -- y3,y2
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r5 -- y1,y0
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r6 -- u1,u0
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r7 -- v1,v0
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*/
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r2=[i1++]; // oy
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.L0565:
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/*
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rrrrrrrr gggggggg bbbbbbbb
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5432109876543210
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bbbbb >>3
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gggggggg <<3
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rrrrrrrr <<8
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rrrrrggggggbbbbb
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*/
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(r4,r5) = byteop16m (r1:0, r3:2) || r3=[i1++]; // oc
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(r7,r6) = byteop16m (r1:0, r3:2) (r);
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r5 = r5 << 2 (v); // y1,y0
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r4 = r4 << 2 (v); // y3,y2
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r6 = r6 << 2 (v) || r0=[i1++]; // u1,u0, r0=zero
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r7 = r7 << 2 (v) || r1=[i1++]; // v1,v0 r1=cy
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/* Y' = y*cy */
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a1 = r1.h*r5.h, a0 = r1.l*r5.l || r1=[i1++]; // crv
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/* R = Y+ crv*(Cr-128) */
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r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
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a1 -= r1.h*r7.l, a0 -= r1.l*r7.l || r5=[i1++]; // rmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cbu
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r2 = r2 >> 3 (v);
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r3 = r2 & r5;
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/* B = Y+ cbu*(Cb-128) */
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r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
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a1 -= r1.h*r6.l, a0 -= r1.l*r6.l || r5=[i1++]; // bmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cgu
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r2 = r2 << 8 (v);
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r2 = r2 & r5;
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r3 = r3 | r2;
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/* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
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a1 += r1.h*r6.l, a0 += r1.l*r6.l || r1=[i1++]; // cgv
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r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
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r2 = byteop3p(r3:2, r1:0)(LO) || r5=[i1++m0]; // gmask
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r2 = r2 << 3 (v);
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r2 = r2 & r5;
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r3 = r3 | r2;
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[p1++]=r3 || r1=[i1++]; // cy
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/* Y' = y*cy */
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a1 = r1.h*r4.h, a0 = r1.l*r4.l || r1=[i1++]; // crv
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/* R = Y+ crv*(Cr-128) */
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r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
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a1 -= r1.h*r7.h, a0 -= r1.l*r7.h || r5=[i1++]; // rmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cbu
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r2 = r2 >> 3 (v);
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r3 = r2 & r5;
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/* B = Y+ cbu*(Cb-128) */
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r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
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a1 -= r1.h*r6.h, a0 -= r1.l*r6.h || r5=[i1++]; // bmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cgu
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r2 = r2 << 8 (v);
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r2 = r2 & r5;
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r3 = r3 | r2;
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/* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
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a1 += r1.h*r6.h, a0 += r1.l*r6.h || r1=[i1++]; // cgv
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r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h) || r5=[i1++]; // gmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r0 = [i0++]; // 2Y
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r2 = r2 << 3 (v) || r1.l = w[i2++]; // 2u
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r2 = r2 & r5;
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r3 = r3 | r2;
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[p1++]=r3 || r1.h = w[i3++]; // 2v
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.L1565: r2=[i1++]; // oy
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l1 = 0;
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(r7:4) = [sp++];
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unlink;
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rts;
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DEFUN_END(yuv2rgb565_line)
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DEFUN(yuv2rgb555_line,MEM,
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(uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
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link 0;
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[--sp] = (r7:4);
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p1 = [fp+ARG_OUT];
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r3 = [fp+ARG_W];
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i0 = r0;
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i2 = r1;
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i3 = r2;
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r0 = [fp+ARG_COEFF];
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i1 = r0;
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b1 = i1;
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l1 = COEFF_LEN;
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m0 = COEFF_REL_CY_OFF;
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p0 = r3;
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r0 = [i0++]; // 2Y
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r1.l = w[i2++]; // 2u
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r1.h = w[i3++]; // 2v
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p0 = p0>>2;
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lsetup (.L0555, .L1555) lc0 = p0;
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/*
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uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
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r0 -- used to load 4ys
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r1 -- used to load 2us,2vs
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r4 -- y3,y2
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r5 -- y1,y0
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r6 -- u1,u0
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r7 -- v1,v0
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*/
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r2=[i1++]; // oy
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.L0555:
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/*
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rrrrrrrr gggggggg bbbbbbbb
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5432109876543210
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bbbbb >>3
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gggggggg <<2
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rrrrrrrr <<7
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xrrrrrgggggbbbbb
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*/
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(r4,r5) = byteop16m (r1:0, r3:2) || r3=[i1++]; // oc
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(r7,r6) = byteop16m (r1:0, r3:2) (r);
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r5 = r5 << 2 (v); // y1,y0
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r4 = r4 << 2 (v); // y3,y2
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r6 = r6 << 2 (v) || r0=[i1++]; // u1,u0, r0=zero
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r7 = r7 << 2 (v) || r1=[i1++]; // v1,v0 r1=cy
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/* Y' = y*cy */
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a1 = r1.h*r5.h, a0 = r1.l*r5.l || r1=[i1++]; // crv
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/* R = Y+ crv*(Cr-128) */
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r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
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a1 -= r1.h*r7.l, a0 -= r1.l*r7.l || r5=[i1++]; // rmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cbu
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r2 = r2 >> 3 (v);
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r3 = r2 & r5;
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/* B = Y+ cbu*(Cb-128) */
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r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
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a1 -= r1.h*r6.l, a0 -= r1.l*r6.l || r5=[i1++]; // bmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cgu
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r2 = r2 << 7 (v);
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r2 = r2 & r5;
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r3 = r3 | r2;
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/* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
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a1 += r1.h*r6.l, a0 += r1.l*r6.l || r1=[i1++]; // cgv
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r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
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r2 = byteop3p(r3:2, r1:0)(LO) || r5=[i1++m0]; // gmask
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r2 = r2 << 2 (v);
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r2 = r2 & r5;
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r3 = r3 | r2;
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[p1++]=r3 || r1=[i1++]; // cy
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/* Y' = y*cy */
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a1 = r1.h*r4.h, a0 = r1.l*r4.l || r1=[i1++]; // crv
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/* R = Y+ crv*(Cr-128) */
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r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
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a1 -= r1.h*r7.h, a0 -= r1.l*r7.h || r5=[i1++]; // rmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cbu
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r2 = r2 >> 3 (v);
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r3 = r2 & r5;
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/* B = Y+ cbu*(Cb-128) */
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r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
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a1 -= r1.h*r6.h, a0 -= r1.l*r6.h || r5=[i1++]; // bmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cgu
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r2 = r2 << 7 (v);
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r2 = r2 & r5;
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r3 = r3 | r2;
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/* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
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a1 += r1.h*r6.h, a0 += r1.l*r6.h || r1=[i1++]; // cgv
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r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h) || r5=[i1++]; // gmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r0=[i0++]; // 4Y
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r2 = r2 << 2 (v) || r1.l=w[i2++]; // 2u
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r2 = r2 & r5;
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r3 = r3 | r2;
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[p1++]=r3 || r1.h=w[i3++]; // 2v
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.L1555: r2=[i1++]; // oy
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l1 = 0;
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(r7:4) = [sp++];
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unlink;
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rts;
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DEFUN_END(yuv2rgb555_line)
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DEFUN(yuv2rgb24_line,MEM,
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(uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
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link 0;
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[--sp] = (r7:4);
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p1 = [fp+ARG_OUT];
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r3 = [fp+ARG_W];
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p2 = p1;
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p2 += 3;
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i0 = r0;
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i2 = r1;
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i3 = r2;
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r0 = [fp+ARG_COEFF]; // coeff buffer
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i1 = r0;
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b1 = i1;
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l1 = COEFF_LEN;
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m0 = COEFF_REL_CY_OFF;
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p0 = r3;
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r0 = [i0++]; // 2Y
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r1.l = w[i2++]; // 2u
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r1.h = w[i3++]; // 2v
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p0 = p0>>2;
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lsetup (.L0888, .L1888) lc0 = p0;
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/*
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uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
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r0 -- used to load 4ys
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r1 -- used to load 2us,2vs
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r4 -- y3,y2
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r5 -- y1,y0
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r6 -- u1,u0
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r7 -- v1,v0
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*/
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r2=[i1++]; // oy
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.L0888:
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(r4,r5) = byteop16m (r1:0, r3:2) || r3=[i1++]; // oc
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(r7,r6) = byteop16m (r1:0, r3:2) (r);
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r5 = r5 << 2 (v); // y1,y0
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r4 = r4 << 2 (v); // y3,y2
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r6 = r6 << 2 (v) || r0=[i1++]; // u1,u0, r0=zero
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r7 = r7 << 2 (v) || r1=[i1++]; // v1,v0 r1=cy
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/* Y' = y*cy */
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a1 = r1.h*r5.h, a0 = r1.l*r5.l || r1=[i1++]; // crv
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/* R = Y+ crv*(Cr-128) */
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r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
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a1 -= r1.h*r7.l, a0 -= r1.l*r7.l || r5=[i1++]; // rmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cbu
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r2=r2>>16 || B[p1++]=r2;
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B[p2++]=r2;
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/* B = Y+ cbu*(Cb-128) */
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r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
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a1 -= r1.h*r6.l, a0 -= r1.l*r6.l || r5=[i1++]; // bmask
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r3 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cgu
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/* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
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a1 += r1.h*r6.l, a0 += r1.l*r6.l || r1=[i1++]; // cgv
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r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
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r2 = byteop3p(r3:2, r1:0)(LO) || r5=[i1++m0]; // gmask, oy,cy,zero
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r2=r2>>16 || B[p1++]=r2;
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B[p2++]=r2;
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r3=r3>>16 || B[p1++]=r3;
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B[p2++]=r3 || r1=[i1++]; // cy
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p1+=3;
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p2+=3;
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/* Y' = y*cy */
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a1 = r1.h*r4.h, a0 = r1.l*r4.l || r1=[i1++]; // crv
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/* R = Y+ crv*(Cr-128) */
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r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
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a1 -= r1.h*r7.h, a0 -= r1.l*r7.h || r5=[i1++]; // rmask
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r2 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cbu
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r2=r2>>16 || B[p1++]=r2;
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B[p2++]=r2;
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/* B = Y+ cbu*(Cb-128) */
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r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
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a1 -= r1.h*r6.h, a0 -= r1.l*r6.h || r5=[i1++]; // bmask
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r3 = byteop3p(r3:2, r1:0)(LO) || r1=[i1++]; // cgu
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/* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
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a1 += r1.h*r6.h, a0 += r1.l*r6.h || r1=[i1++]; // cgv
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r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
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r2 = byteop3p(r3:2, r1:0)(LO) || r5=[i1++]; // gmask
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r2=r2>>16 || B[p1++]=r2 || r0 = [i0++]; // 4y
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B[p2++]=r2 || r1.l = w[i2++]; // 2u
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r3=r3>>16 || B[p1++]=r3 || r1.h = w[i3++]; // 2v
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B[p2++]=r3 || r2=[i1++]; // oy
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p1+=3;
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.L1888: p2+=3;
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l1 = 0;
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(r7:4) = [sp++];
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unlink;
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rts;
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2007-06-05 13:18:16 +00:00
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DEFUN_END(yuv2rgb24_line)
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2007-05-19 12:57:17 +00:00
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#define ARG_vdst 20
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#define ARG_width 24
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#define ARG_height 28
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#define ARG_lumStride 32
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#define ARG_chromStride 36
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#define ARG_srcStride 40
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DEFUN(uyvytoyv12, mL3, (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
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long width, long height,
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long lumStride, long chromStride, long srcStride)):
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link 0;
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[--sp] = (r7:4,p5:4);
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p0 = r1; // Y top even
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i2 = r2; // *u
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r2 = [fp + ARG_vdst];
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i3 = r2; // *v
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r1 = [fp + ARG_srcStride];
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r2 = r0 + r1;
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2007-06-22 00:14:22 +00:00
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r1 += -8; // i0,i1 is pre read need to correct
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2007-05-19 12:57:17 +00:00
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m0 = r1;
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i0 = r0; // uyvy_T even
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i1 = r2; // uyvy_B odd
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p2 = [fp + ARG_lumStride];
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p1 = p0 + p2; // Y bot odd
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p5 = [fp + ARG_width];
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p4 = [fp + ARG_height];
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2007-06-22 00:07:55 +00:00
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r0 = p5;
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2007-05-19 12:57:17 +00:00
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p4 = p4 >> 1;
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p5 = p5 >> 2;
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2007-06-22 00:07:55 +00:00
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r2 = [fp + ARG_chromStride];
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r0 = r0 >> 1;
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r2 = r2 - r0;
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m1 = r2;
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2007-05-19 12:57:17 +00:00
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/* I0,I1 - src input line pointers
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* p0,p1 - luma output line pointers
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* I2 - dstU
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* I3 - dstV
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*/
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2007-06-22 00:12:44 +00:00
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lsetup (0f, 1f) lc1 = p4; // H/2
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0: r0 = [i0++] || r2 = [i1++];
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r1 = [i0++] || r3 = [i1++];
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r4 = byteop1p(r1:0, r3:2);
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r5 = byteop1p(r1:0, r3:2) (r);
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lsetup (2f, 3f) lc0 = p5; // W/4
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2: r0 = r0 >> 8(v);
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2007-05-19 12:57:17 +00:00
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r1 = r1 >> 8(v);
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r2 = r2 >> 8(v);
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r3 = r3 >> 8(v);
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r0 = bytepack(r0, r1);
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2007-06-22 00:12:44 +00:00
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r2 = bytepack(r2, r3) || [p0++] = r0; // yyyy
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r6 = pack(r5.l, r4.l) || [p1++] = r2; // yyyy
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r7 = pack(r5.h, r4.h) || r0 = [i0++] || r2 = [i1++];
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r6 = bytepack(r6, r7) || r1 = [i0++] || r3 = [i1++];
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r4 = byteop1p(r1:0, r3:2) || w[i2++] = r6.l; // uu
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3: r5 = byteop1p(r1:0, r3:2) (r) || w[i3++] = r6.h; // vv
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2007-05-19 12:57:17 +00:00
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i0 += m0;
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i1 += m0;
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2007-06-22 00:07:55 +00:00
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i2 += m1;
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i3 += m1;
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2007-05-19 12:57:17 +00:00
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p0 = p0 + p2;
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1: p1 = p1 + p2;
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(r7:4,p5:4) = [sp++];
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unlink;
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rts;
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DEFUN_END(uyvytoyv12)
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2007-07-20 00:09:45 +00:00
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DEFUN(yuyvtoyv12, mL3, (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
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long width, long height,
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long lumStride, long chromStride, long srcStride)):
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link 0;
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[--sp] = (r7:4,p5:4);
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p0 = r1; // Y top even
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i2 = r2; // *u
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r2 = [fp + ARG_vdst];
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i3 = r2; // *v
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r1 = [fp + ARG_srcStride];
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r2 = r0 + r1;
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r1 += -8; // i0,i1 is pre read need to correct
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m0 = r1;
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i0 = r0; // uyvy_T even
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i1 = r2; // uyvy_B odd
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p2 = [fp + ARG_lumStride];
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p1 = p0 + p2; // Y bot odd
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p5 = [fp + ARG_width];
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p4 = [fp + ARG_height];
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r0 = p5;
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p4 = p4 >> 1;
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p5 = p5 >> 2;
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r2 = [fp + ARG_chromStride];
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r0 = r0 >> 1;
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r2 = r2 - r0;
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m1 = r2;
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/* I0,I1 - src input line pointers
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* p0,p1 - luma output line pointers
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* I2 - dstU
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* I3 - dstV
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*/
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lsetup (0f, 1f) lc1 = p4; // H/2
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0: r0 = [i0++] || r2 = [i1++];
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r1 = [i0++] || r3 = [i1++];
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r4 = bytepack(r0, r1);
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r5 = bytepack(r2, r3);
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lsetup (2f, 3f) lc0 = p5; // W/4
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2: r0 = r0 >> 8(v) || [p0++] = r4; // yyyy-even
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r1 = r1 >> 8(v) || [p1++] = r5; // yyyy-odd
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r2 = r2 >> 8(v);
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r3 = r3 >> 8(v);
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r4 = byteop1p(r1:0, r3:2);
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r5 = byteop1p(r1:0, r3:2) (r);
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r6 = pack(r5.l, r4.l);
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r7 = pack(r5.h, r4.h) || r0 = [i0++] || r2 = [i1++];
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r6 = bytepack(r6, r7) || r1 = [i0++] || r3 = [i1++];
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r4 = bytepack(r0, r1) || w[i2++] = r6.l; // uu
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3: r5 = bytepack(r2, r3) || w[i3++] = r6.h; // vv
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i0 += m0;
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i1 += m0;
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i2 += m1;
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i3 += m1;
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p0 = p0 + p2;
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1: p1 = p1 + p2;
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(r7:4,p5:4) = [sp++];
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unlink;
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rts;
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DEFUN_END(yuyvtoyv12)
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