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205 lines
8.5 KiB
C
205 lines
8.5 KiB
C
/*
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* AltiVec-enhanced yuv-to-yuv conversion routines.
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*
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* Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
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* based on the equivalent C code in swscale.c
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include <inttypes.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libswscale/swscale.h"
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#include "libswscale/swscale_internal.h"
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#if HAVE_ALTIVEC
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static int yv12toyuy2_unscaled_altivec(SwsContext *c, const uint8_t *src[],
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int srcStride[], int srcSliceY,
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int srcSliceH, uint8_t *dstParam[],
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int dstStride_a[])
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{
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uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
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// yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
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// srcStride[0], srcStride[1], dstStride[0]);
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const uint8_t *ysrc = src[0];
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const uint8_t *usrc = src[1];
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const uint8_t *vsrc = src[2];
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const int width = c->srcW;
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const int height = srcSliceH;
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const int lumStride = srcStride[0];
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const int chromStride = srcStride[1];
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const int dstStride = dstStride_a[0];
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const vector unsigned char yperm = vec_lvsl(0, ysrc);
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const int vertLumPerChroma = 2;
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register unsigned int y;
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/* This code assumes:
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*
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* 1) dst is 16 bytes-aligned
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* 2) dstStride is a multiple of 16
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* 3) width is a multiple of 16
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* 4) lum & chrom stride are multiples of 8
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*/
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for (y = 0; y < height; y++) {
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int i;
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for (i = 0; i < width - 31; i += 32) {
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const unsigned int j = i >> 1;
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vector unsigned char v_yA = vec_ld(i, ysrc);
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vector unsigned char v_yB = vec_ld(i + 16, ysrc);
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vector unsigned char v_yC = vec_ld(i + 32, ysrc);
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vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
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vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
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vector unsigned char v_uA = vec_ld(j, usrc);
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vector unsigned char v_uB = vec_ld(j + 16, usrc);
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vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
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vector unsigned char v_vA = vec_ld(j, vsrc);
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vector unsigned char v_vB = vec_ld(j + 16, vsrc);
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vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
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vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
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vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
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vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
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vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
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vector unsigned char v_yuy2_2 = vec_mergeh(v_y2, v_uv_b);
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vector unsigned char v_yuy2_3 = vec_mergel(v_y2, v_uv_b);
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vec_st(v_yuy2_0, (i << 1), dst);
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vec_st(v_yuy2_1, (i << 1) + 16, dst);
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vec_st(v_yuy2_2, (i << 1) + 32, dst);
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vec_st(v_yuy2_3, (i << 1) + 48, dst);
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}
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if (i < width) {
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const unsigned int j = i >> 1;
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vector unsigned char v_y1 = vec_ld(i, ysrc);
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vector unsigned char v_u = vec_ld(j, usrc);
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vector unsigned char v_v = vec_ld(j, vsrc);
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vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
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vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
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vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
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vec_st(v_yuy2_0, (i << 1), dst);
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vec_st(v_yuy2_1, (i << 1) + 16, dst);
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}
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if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
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usrc += chromStride;
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vsrc += chromStride;
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}
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ysrc += lumStride;
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dst += dstStride;
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}
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return srcSliceH;
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}
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static int yv12touyvy_unscaled_altivec(SwsContext *c, const uint8_t *src[],
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int srcStride[], int srcSliceY,
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int srcSliceH, uint8_t *dstParam[],
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int dstStride_a[])
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{
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uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
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// yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
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// srcStride[0], srcStride[1], dstStride[0]);
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const uint8_t *ysrc = src[0];
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const uint8_t *usrc = src[1];
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const uint8_t *vsrc = src[2];
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const int width = c->srcW;
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const int height = srcSliceH;
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const int lumStride = srcStride[0];
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const int chromStride = srcStride[1];
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const int dstStride = dstStride_a[0];
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const int vertLumPerChroma = 2;
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const vector unsigned char yperm = vec_lvsl(0, ysrc);
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register unsigned int y;
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/* This code assumes:
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*
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* 1) dst is 16 bytes-aligned
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* 2) dstStride is a multiple of 16
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* 3) width is a multiple of 16
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* 4) lum & chrom stride are multiples of 8
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*/
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for (y = 0; y < height; y++) {
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int i;
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for (i = 0; i < width - 31; i += 32) {
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const unsigned int j = i >> 1;
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vector unsigned char v_yA = vec_ld(i, ysrc);
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vector unsigned char v_yB = vec_ld(i + 16, ysrc);
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vector unsigned char v_yC = vec_ld(i + 32, ysrc);
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vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
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vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
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vector unsigned char v_uA = vec_ld(j, usrc);
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vector unsigned char v_uB = vec_ld(j + 16, usrc);
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vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
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vector unsigned char v_vA = vec_ld(j, vsrc);
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vector unsigned char v_vB = vec_ld(j + 16, vsrc);
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vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
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vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
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vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
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vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
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vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
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vector unsigned char v_uyvy_2 = vec_mergeh(v_uv_b, v_y2);
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vector unsigned char v_uyvy_3 = vec_mergel(v_uv_b, v_y2);
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vec_st(v_uyvy_0, (i << 1), dst);
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vec_st(v_uyvy_1, (i << 1) + 16, dst);
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vec_st(v_uyvy_2, (i << 1) + 32, dst);
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vec_st(v_uyvy_3, (i << 1) + 48, dst);
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}
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if (i < width) {
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const unsigned int j = i >> 1;
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vector unsigned char v_y1 = vec_ld(i, ysrc);
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vector unsigned char v_u = vec_ld(j, usrc);
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vector unsigned char v_v = vec_ld(j, vsrc);
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vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
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vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
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vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
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vec_st(v_uyvy_0, (i << 1), dst);
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vec_st(v_uyvy_1, (i << 1) + 16, dst);
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}
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if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
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usrc += chromStride;
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vsrc += chromStride;
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}
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ysrc += lumStride;
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dst += dstStride;
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}
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return srcSliceH;
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}
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#endif /* HAVE_ALTIVEC */
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av_cold void ff_get_unscaled_swscale_ppc(SwsContext *c)
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{
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#if HAVE_ALTIVEC
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if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
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return;
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if (!(c->srcW & 15) && !(c->flags & SWS_BITEXACT) &&
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c->srcFormat == AV_PIX_FMT_YUV420P) {
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enum AVPixelFormat dstFormat = c->dstFormat;
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// unscaled YV12 -> packed YUV, we want speed
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if (dstFormat == AV_PIX_FMT_YUYV422)
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c->swscale = yv12toyuy2_unscaled_altivec;
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else if (dstFormat == AV_PIX_FMT_UYVY422)
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c->swscale = yv12touyvy_unscaled_altivec;
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}
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#endif /* HAVE_ALTIVEC */
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}
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