| /* |
| * GMC (Global Motion Compensation), AltiVec-enabled |
| * |
| * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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 "libavcodec/mpegvideodsp.h" |
| |
| #if HAVE_ALTIVEC |
| /* AltiVec-enhanced gmc1. ATM this code assumes stride is a multiple of 8 |
| * to preserve proper dst alignment. */ |
| static void 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; |
| } |
| } |
| #endif /* HAVE_ALTIVEC */ |
| |
| av_cold void ff_mpegvideodsp_init_ppc(MpegVideoDSPContext *c) |
| { |
| #if HAVE_ALTIVEC |
| c->gmc1 = gmc1_altivec; |
| #endif /* HAVE_ALTIVEC */ |
| } |