mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
4.9 KiB
124 lines
4.9 KiB
/* |
|
* GMC (Global Motion Compensation), AltiVec-enabled |
|
* |
|
* Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* Libav 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 |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include "libavutil/mem.h" |
|
#include "libavutil/ppc/types_altivec.h" |
|
#include "libavutil/ppc/util_altivec.h" |
|
#include "dsputil_altivec.h" |
|
|
|
/* AltiVec-enhanced gmc1. ATM this code assumes stride is a multiple of 8 |
|
* to preserve proper dst alignment. */ |
|
void ff_gmc1_altivec(uint8_t *dst /* align 8 */, uint8_t *src /* align1 */, |
|
int stride, int h, int x16, int y16, int rounder) |
|
{ |
|
int i; |
|
const DECLARE_ALIGNED(16, unsigned short, rounder_a) = rounder; |
|
const DECLARE_ALIGNED(16, unsigned short, ABCD)[8] = { |
|
(16 - x16) * (16 - y16), /* A */ |
|
(x16) * (16 - y16), /* B */ |
|
(16 - x16) * (y16), /* C */ |
|
(x16) * (y16), /* D */ |
|
0, 0, 0, 0 /* padding */ |
|
}; |
|
register const vector unsigned char vczero = |
|
(const vector unsigned char) vec_splat_u8(0); |
|
register const vector unsigned short vcsr8 = |
|
(const vector unsigned short) vec_splat_u16(8); |
|
register vector unsigned char dstv, dstv2, srcvB, srcvC, srcvD; |
|
register vector unsigned short tempB, tempC, tempD; |
|
unsigned long dst_odd = (unsigned long) dst & 0x0000000F; |
|
unsigned long src_really_odd = (unsigned long) src & 0x0000000F; |
|
register vector unsigned short tempA = |
|
vec_ld(0, (const unsigned short *) ABCD); |
|
register vector unsigned short Av = vec_splat(tempA, 0); |
|
register vector unsigned short Bv = vec_splat(tempA, 1); |
|
register vector unsigned short Cv = vec_splat(tempA, 2); |
|
register vector unsigned short Dv = vec_splat(tempA, 3); |
|
register vector unsigned short rounderV = |
|
vec_splat((vec_u16) vec_lde(0, &rounder_a), 0); |
|
|
|
/* we'll be able to pick-up our 9 char elements at src from those |
|
* 32 bytes we load the first batch here, as inside the loop we can |
|
* reuse 'src + stride' from one iteration as the 'src' of the next. */ |
|
register vector unsigned char src_0 = vec_ld(0, src); |
|
register vector unsigned char src_1 = vec_ld(16, src); |
|
register vector unsigned char srcvA = vec_perm(src_0, src_1, |
|
vec_lvsl(0, src)); |
|
|
|
if (src_really_odd != 0x0000000F) |
|
/* If src & 0xF == 0xF, then (src + 1) is properly aligned |
|
* on the second vector. */ |
|
srcvB = vec_perm(src_0, src_1, vec_lvsl(1, src)); |
|
else |
|
srcvB = src_1; |
|
srcvA = vec_mergeh(vczero, srcvA); |
|
srcvB = vec_mergeh(vczero, srcvB); |
|
|
|
for (i = 0; i < h; i++) { |
|
dst_odd = (unsigned long) dst & 0x0000000F; |
|
src_really_odd = (((unsigned long) src) + stride) & 0x0000000F; |
|
|
|
dstv = vec_ld(0, dst); |
|
|
|
/* We'll be able to pick-up our 9 char elements at src + stride from |
|
* those 32 bytes then reuse the resulting 2 vectors srvcC and srcvD |
|
* as the next srcvA and srcvB. */ |
|
src_0 = vec_ld(stride + 0, src); |
|
src_1 = vec_ld(stride + 16, src); |
|
srcvC = vec_perm(src_0, src_1, vec_lvsl(stride + 0, src)); |
|
|
|
if (src_really_odd != 0x0000000F) |
|
/* If src & 0xF == 0xF, then (src + 1) is properly aligned |
|
* on the second vector. */ |
|
srcvD = vec_perm(src_0, src_1, vec_lvsl(stride + 1, src)); |
|
else |
|
srcvD = src_1; |
|
|
|
srcvC = vec_mergeh(vczero, srcvC); |
|
srcvD = vec_mergeh(vczero, srcvD); |
|
|
|
/* OK, now we (finally) do the math :-) |
|
* Those four instructions replace 32 int muls & 32 int adds. |
|
* Isn't AltiVec nice? */ |
|
tempA = vec_mladd((vector unsigned short) srcvA, Av, rounderV); |
|
tempB = vec_mladd((vector unsigned short) srcvB, Bv, tempA); |
|
tempC = vec_mladd((vector unsigned short) srcvC, Cv, tempB); |
|
tempD = vec_mladd((vector unsigned short) srcvD, Dv, tempC); |
|
|
|
srcvA = srcvC; |
|
srcvB = srcvD; |
|
|
|
tempD = vec_sr(tempD, vcsr8); |
|
|
|
dstv2 = vec_pack(tempD, (vector unsigned short) vczero); |
|
|
|
if (dst_odd) |
|
dstv2 = vec_perm(dstv, dstv2, vcprm(0, 1, s0, s1)); |
|
else |
|
dstv2 = vec_perm(dstv, dstv2, vcprm(s0, s1, 2, 3)); |
|
|
|
vec_st(dstv2, 0, dst); |
|
|
|
dst += stride; |
|
src += stride; |
|
} |
|
}
|
|
|