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cd48318035
The implementation is pretty straight-forward. Most of the existing NV12 codepaths work regardless of subsampling and are re-used as is. Where necessary I wrote the slightly different NV24 versions. Finally, the one thing that confused me for a long time was the asm specific x86 path that did an explicit exclusion check for NV12. I replaced that with a semi-planar check and also updated the equivalent PPC code, which Lauri kindly checked.
291 lines
9.1 KiB
C
291 lines
9.1 KiB
C
/*
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* AltiVec-enhanced yuv2yuvX
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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 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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#include <inttypes.h>
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#include "config.h"
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#include "libswscale/swscale.h"
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#include "libswscale/swscale_internal.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "yuv2rgb_altivec.h"
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#include "libavutil/ppc/util_altivec.h"
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#if HAVE_ALTIVEC
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#if HAVE_BIGENDIAN
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#define vzero vec_splat_s32(0)
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#define GET_LS(a,b,c,s) {\
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vector signed short l2 = vec_ld(((b) << 1) + 16, s);\
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ls = vec_perm(a, l2, c);\
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a = l2;\
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}
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#define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do {\
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vector signed short ls;\
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vector signed int vf1, vf2, i1, i2;\
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GET_LS(l1, x, perm, src);\
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i1 = vec_mule(filter, ls);\
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i2 = vec_mulo(filter, ls);\
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vf1 = vec_mergeh(i1, i2);\
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vf2 = vec_mergel(i1, i2);\
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d1 = vec_add(d1, vf1);\
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d2 = vec_add(d2, vf2);\
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} while (0)
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#define LOAD_FILTER(vf,f) {\
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vector unsigned char perm0 = vec_lvsl(joffset, f);\
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vf = vec_ld(joffset, f);\
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vf = vec_perm(vf, vf, perm0);\
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}
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#define LOAD_L1(ll1,s,p){\
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p = vec_lvsl(xoffset, s);\
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ll1 = vec_ld(xoffset, s);\
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}
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// The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
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// The neat trick: We only care for half the elements,
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// high or low depending on (i<<3)%16 (it's 0 or 8 here),
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// and we're going to use vec_mule, so we choose
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// carefully how to "unpack" the elements into the even slots.
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#define GET_VF4(a, vf, f) {\
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vf = vec_ld(a<< 3, f);\
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if ((a << 3) % 16)\
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vf = vec_mergel(vf, (vector signed short)vzero);\
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else\
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vf = vec_mergeh(vf, (vector signed short)vzero);\
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}
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#define FIRST_LOAD(sv, pos, s, per) {\
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sv = vec_ld(pos, s);\
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per = vec_lvsl(pos, s);\
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}
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#define UPDATE_PTR(s0, d0, s1, d1) {\
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d0 = s0;\
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d1 = s1;\
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}
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#define LOAD_SRCV(pos, a, s, per, v0, v1, vf) {\
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v1 = vec_ld(pos + a + 16, s);\
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vf = vec_perm(v0, v1, per);\
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}
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#define LOAD_SRCV8(pos, a, s, per, v0, v1, vf) {\
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if ((((uintptr_t)s + pos) % 16) > 8) {\
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v1 = vec_ld(pos + a + 16, s);\
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}\
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vf = vec_perm(v0, src_v1, per);\
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}
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#define GET_VFD(a, b, f, vf0, vf1, per, vf, off) {\
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vf1 = vec_ld((a * 2 * filterSize) + (b * 2) + 16 + off, f);\
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vf = vec_perm(vf0, vf1, per);\
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}
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#define FUNC(name) name ## _altivec
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#include "swscale_ppc_template.c"
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#undef FUNC
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#undef vzero
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#endif /* HAVE_BIGENDIAN */
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#define output_pixel(pos, val, bias, signedness) \
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if (big_endian) { \
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AV_WB16(pos, bias + av_clip_ ## signedness ## 16(val >> shift)); \
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} else { \
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AV_WL16(pos, bias + av_clip_ ## signedness ## 16(val >> shift)); \
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}
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static void
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yuv2plane1_float_u(const int32_t *src, float *dest, int dstW, int start)
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{
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static const int big_endian = HAVE_BIGENDIAN;
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static const int shift = 3;
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static const float float_mult = 1.0f / 65535.0f;
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int i, val;
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uint16_t val_uint;
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for (i = start; i < dstW; ++i){
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val = src[i] + (1 << (shift - 1));
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output_pixel(&val_uint, val, 0, uint);
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dest[i] = float_mult * (float)val_uint;
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}
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}
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static void
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yuv2plane1_float_bswap_u(const int32_t *src, uint32_t *dest, int dstW, int start)
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{
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static const int big_endian = HAVE_BIGENDIAN;
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static const int shift = 3;
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static const float float_mult = 1.0f / 65535.0f;
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int i, val;
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uint16_t val_uint;
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for (i = start; i < dstW; ++i){
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val = src[i] + (1 << (shift - 1));
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output_pixel(&val_uint, val, 0, uint);
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dest[i] = av_bswap32(av_float2int(float_mult * (float)val_uint));
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}
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}
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static void yuv2plane1_float_altivec(const int32_t *src, float *dest, int dstW)
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{
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const int dst_u = -(uintptr_t)dest & 3;
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const int shift = 3;
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const int add = (1 << (shift - 1));
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const int clip = (1 << 16) - 1;
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const float fmult = 1.0f / 65535.0f;
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const vector uint32_t vadd = (vector uint32_t) {add, add, add, add};
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const vector uint32_t vshift = (vector uint32_t) vec_splat_u32(shift);
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const vector uint32_t vlargest = (vector uint32_t) {clip, clip, clip, clip};
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const vector float vmul = (vector float) {fmult, fmult, fmult, fmult};
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const vector float vzero = (vector float) {0, 0, 0, 0};
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vector uint32_t v;
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vector float vd;
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int i;
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yuv2plane1_float_u(src, dest, dst_u, 0);
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for (i = dst_u; i < dstW - 3; i += 4) {
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v = vec_ld(0, (const uint32_t *) &src[i]);
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v = vec_add(v, vadd);
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v = vec_sr(v, vshift);
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v = vec_min(v, vlargest);
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vd = vec_ctf(v, 0);
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vd = vec_madd(vd, vmul, vzero);
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vec_st(vd, 0, &dest[i]);
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}
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yuv2plane1_float_u(src, dest, dstW, i);
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}
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static void yuv2plane1_float_bswap_altivec(const int32_t *src, uint32_t *dest, int dstW)
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{
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const int dst_u = -(uintptr_t)dest & 3;
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const int shift = 3;
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const int add = (1 << (shift - 1));
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const int clip = (1 << 16) - 1;
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const float fmult = 1.0f / 65535.0f;
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const vector uint32_t vadd = (vector uint32_t) {add, add, add, add};
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const vector uint32_t vshift = (vector uint32_t) vec_splat_u32(shift);
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const vector uint32_t vlargest = (vector uint32_t) {clip, clip, clip, clip};
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const vector float vmul = (vector float) {fmult, fmult, fmult, fmult};
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const vector float vzero = (vector float) {0, 0, 0, 0};
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const vector uint32_t vswapbig = (vector uint32_t) {16, 16, 16, 16};
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const vector uint16_t vswapsmall = vec_splat_u16(8);
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vector uint32_t v;
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vector float vd;
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int i;
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yuv2plane1_float_bswap_u(src, dest, dst_u, 0);
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for (i = dst_u; i < dstW - 3; i += 4) {
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v = vec_ld(0, (const uint32_t *) &src[i]);
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v = vec_add(v, vadd);
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v = vec_sr(v, vshift);
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v = vec_min(v, vlargest);
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vd = vec_ctf(v, 0);
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vd = vec_madd(vd, vmul, vzero);
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vd = (vector float) vec_rl((vector uint32_t) vd, vswapbig);
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vd = (vector float) vec_rl((vector uint16_t) vd, vswapsmall);
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vec_st(vd, 0, (float *) &dest[i]);
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}
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yuv2plane1_float_bswap_u(src, dest, dstW, i);
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}
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#define yuv2plane1_float(template, dest_type, BE_LE) \
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static void yuv2plane1_float ## BE_LE ## _altivec(const int16_t *src, uint8_t *dest, \
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int dstW, \
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const uint8_t *dither, int offset) \
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{ \
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template((const int32_t *)src, (dest_type *)dest, dstW); \
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}
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#if HAVE_BIGENDIAN
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yuv2plane1_float(yuv2plane1_float_altivec, float, BE)
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yuv2plane1_float(yuv2plane1_float_bswap_altivec, uint32_t, LE)
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#else
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yuv2plane1_float(yuv2plane1_float_altivec, float, LE)
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yuv2plane1_float(yuv2plane1_float_bswap_altivec, uint32_t, BE)
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#endif
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#endif /* HAVE_ALTIVEC */
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av_cold void ff_sws_init_swscale_ppc(SwsContext *c)
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{
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#if HAVE_ALTIVEC
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enum AVPixelFormat dstFormat = c->dstFormat;
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if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
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return;
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#if HAVE_BIGENDIAN
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if (c->srcBpc == 8 && c->dstBpc <= 14) {
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c->hyScale = c->hcScale = hScale_real_altivec;
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}
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if (!is16BPS(dstFormat) && !isNBPS(dstFormat) && !isSemiPlanarYUV(dstFormat) &&
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dstFormat != AV_PIX_FMT_GRAYF32BE && dstFormat != AV_PIX_FMT_GRAYF32LE &&
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!c->needAlpha) {
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c->yuv2planeX = yuv2planeX_altivec;
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}
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#endif
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if (dstFormat == AV_PIX_FMT_GRAYF32BE) {
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c->yuv2plane1 = yuv2plane1_floatBE_altivec;
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} else if (dstFormat == AV_PIX_FMT_GRAYF32LE) {
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c->yuv2plane1 = yuv2plane1_floatLE_altivec;
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}
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/* The following list of supported dstFormat values should
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* match what's found in the body of ff_yuv2packedX_altivec() */
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if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->needAlpha) {
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switch (c->dstFormat) {
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case AV_PIX_FMT_ABGR:
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c->yuv2packedX = ff_yuv2abgr_X_altivec;
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break;
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case AV_PIX_FMT_BGRA:
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c->yuv2packedX = ff_yuv2bgra_X_altivec;
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break;
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case AV_PIX_FMT_ARGB:
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c->yuv2packedX = ff_yuv2argb_X_altivec;
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break;
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case AV_PIX_FMT_RGBA:
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c->yuv2packedX = ff_yuv2rgba_X_altivec;
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break;
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case AV_PIX_FMT_BGR24:
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c->yuv2packedX = ff_yuv2bgr24_X_altivec;
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break;
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case AV_PIX_FMT_RGB24:
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c->yuv2packedX = ff_yuv2rgb24_X_altivec;
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break;
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}
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}
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#endif /* HAVE_ALTIVEC */
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ff_sws_init_swscale_vsx(c);
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}
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