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Diffstat (limited to 'libavcodec/ppc/mpegvideodsp.c')
| -rw-r--r-- | libavcodec/ppc/mpegvideodsp.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/libavcodec/ppc/mpegvideodsp.c b/libavcodec/ppc/mpegvideodsp.c new file mode 100644 index 0000000000..7696954335 --- /dev/null +++ b/libavcodec/ppc/mpegvideodsp.c @@ -0,0 +1,133 @@ +/* + * 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 */ +} |