gradfun.c
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1 /*
2  * Copyright (C) 2009 Loren Merritt <lorenm@u.washignton.edu>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/attributes.h"
22 #include "libavutil/cpu.h"
23 #include "libavutil/mem.h"
24 #include "libavutil/x86/asm.h"
25 #include "libavfilter/gradfun.h"
26 
27 #if HAVE_INLINE_ASM
28 
29 DECLARE_ALIGNED(16, static const uint16_t, pw_7f)[8] = {0x7F,0x7F,0x7F,0x7F,0x7F,0x7F,0x7F,0x7F};
30 DECLARE_ALIGNED(16, static const uint16_t, pw_ff)[8] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
31 
32 #if HAVE_MMXEXT_INLINE
33 static void gradfun_filter_line_mmxext(uint8_t *dst, uint8_t *src, uint16_t *dc,
34  int width, int thresh,
35  const uint16_t *dithers)
36 {
37  intptr_t x;
38  if (width & 3) {
39  x = width & ~3;
40  ff_gradfun_filter_line_c(dst + x, src + x, dc + x / 2, width - x, thresh, dithers);
41  width = x;
42  }
43  x = -width;
44  __asm__ volatile(
45  "movd %4, %%mm5 \n"
46  "pxor %%mm7, %%mm7 \n"
47  "pshufw $0, %%mm5, %%mm5 \n"
48  "movq %6, %%mm6 \n"
49  "movq %5, %%mm4 \n"
50  "1: \n"
51  "movd (%2,%0), %%mm0 \n"
52  "movd (%3,%0), %%mm1 \n"
53  "punpcklbw %%mm7, %%mm0 \n"
54  "punpcklwd %%mm1, %%mm1 \n"
55  "psllw $7, %%mm0 \n"
56  "pxor %%mm2, %%mm2 \n"
57  "psubw %%mm0, %%mm1 \n" // delta = dc - pix
58  "psubw %%mm1, %%mm2 \n"
59  "pmaxsw %%mm1, %%mm2 \n"
60  "pmulhuw %%mm5, %%mm2 \n" // m = abs(delta) * thresh >> 16
61  "psubw %%mm6, %%mm2 \n"
62  "pminsw %%mm7, %%mm2 \n" // m = -max(0, 127-m)
63  "pmullw %%mm2, %%mm2 \n"
64  "paddw %%mm4, %%mm0 \n" // pix += dither
65  "pmulhw %%mm2, %%mm1 \n"
66  "psllw $2, %%mm1 \n" // m = m*m*delta >> 14
67  "paddw %%mm1, %%mm0 \n" // pix += m
68  "psraw $7, %%mm0 \n"
69  "packuswb %%mm0, %%mm0 \n"
70  "movd %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
71  "add $4, %0 \n"
72  "jl 1b \n"
73  "emms \n"
74  :"+r"(x)
75  :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
76  "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
77  :"memory"
78  );
79 }
80 #endif
81 
82 #if HAVE_SSSE3_INLINE
83 static void gradfun_filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
84 {
85  intptr_t x;
86  if (width & 7) {
87  // could be 10% faster if I somehow eliminated this
88  x = width & ~7;
89  ff_gradfun_filter_line_c(dst + x, src + x, dc + x / 2, width - x, thresh, dithers);
90  width = x;
91  }
92  x = -width;
93  __asm__ volatile(
94  "movd %4, %%xmm5 \n"
95  "pxor %%xmm7, %%xmm7 \n"
96  "pshuflw $0,%%xmm5, %%xmm5 \n"
97  "movdqa %6, %%xmm6 \n"
98  "punpcklqdq %%xmm5, %%xmm5 \n"
99  "movdqa %5, %%xmm4 \n"
100  "1: \n"
101  "movq (%2,%0), %%xmm0 \n"
102  "movq (%3,%0), %%xmm1 \n"
103  "punpcklbw %%xmm7, %%xmm0 \n"
104  "punpcklwd %%xmm1, %%xmm1 \n"
105  "psllw $7, %%xmm0 \n"
106  "psubw %%xmm0, %%xmm1 \n" // delta = dc - pix
107  "pabsw %%xmm1, %%xmm2 \n"
108  "pmulhuw %%xmm5, %%xmm2 \n" // m = abs(delta) * thresh >> 16
109  "psubw %%xmm6, %%xmm2 \n"
110  "pminsw %%xmm7, %%xmm2 \n" // m = -max(0, 127-m)
111  "pmullw %%xmm2, %%xmm2 \n"
112  "psllw $1, %%xmm2 \n"
113  "paddw %%xmm4, %%xmm0 \n" // pix += dither
114  "pmulhrsw %%xmm2, %%xmm1 \n" // m = m*m*delta >> 14
115  "paddw %%xmm1, %%xmm0 \n" // pix += m
116  "psraw $7, %%xmm0 \n"
117  "packuswb %%xmm0, %%xmm0 \n"
118  "movq %%xmm0, (%1,%0) \n" // dst = clip(pix>>7)
119  "add $8, %0 \n"
120  "jl 1b \n"
121  :"+&r"(x)
122  :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
123  "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
124  :"memory"
125  );
126 }
127 #endif /* HAVE_SSSE3_INLINE */
128 
129 #if HAVE_SSE2_INLINE
130 static void gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width)
131 {
132 #define BLURV(load)\
133  intptr_t x = -2*width;\
134  __asm__ volatile(\
135  "movdqa %6, %%xmm7 \n"\
136  "1: \n"\
137  load" (%4,%0), %%xmm0 \n"\
138  load" (%5,%0), %%xmm1 \n"\
139  "movdqa %%xmm0, %%xmm2 \n"\
140  "movdqa %%xmm1, %%xmm3 \n"\
141  "psrlw $8, %%xmm0 \n"\
142  "psrlw $8, %%xmm1 \n"\
143  "pand %%xmm7, %%xmm2 \n"\
144  "pand %%xmm7, %%xmm3 \n"\
145  "paddw %%xmm1, %%xmm0 \n"\
146  "paddw %%xmm3, %%xmm2 \n"\
147  "paddw %%xmm2, %%xmm0 \n"\
148  "paddw (%2,%0), %%xmm0 \n"\
149  "movdqa (%1,%0), %%xmm1 \n"\
150  "movdqa %%xmm0, (%1,%0) \n"\
151  "psubw %%xmm1, %%xmm0 \n"\
152  "movdqa %%xmm0, (%3,%0) \n"\
153  "add $16, %0 \n"\
154  "jl 1b \n"\
155  :"+&r"(x)\
156  :"r"(buf+width),\
157  "r"(buf1+width),\
158  "r"(dc+width),\
159  "r"(src+width*2),\
160  "r"(src+width*2+src_linesize),\
161  "m"(*pw_ff)\
162  :"memory"\
163  );
164  if (((intptr_t) src | src_linesize) & 15) {
165  BLURV("movdqu");
166  } else {
167  BLURV("movdqa");
168  }
169 }
170 #endif /* HAVE_SSE2_INLINE */
171 
172 #endif /* HAVE_INLINE_ASM */
173 
175 {
176  int cpu_flags = av_get_cpu_flags();
177 
178 #if HAVE_MMXEXT_INLINE
179  if (cpu_flags & AV_CPU_FLAG_MMXEXT)
180  gf->filter_line = gradfun_filter_line_mmxext;
181 #endif
182 #if HAVE_SSSE3_INLINE
183  if (cpu_flags & AV_CPU_FLAG_SSSE3)
184  gf->filter_line = gradfun_filter_line_ssse3;
185 #endif
186 #if HAVE_SSE2_INLINE
187  if (cpu_flags & AV_CPU_FLAG_SSE2)
188  gf->blur_line = gradfun_blur_line_sse2;
189 #endif
190 }
memory handling functions
Holds instance-specific information for gradfun.
Definition: gradfun.h:28
Macro definitions for various function/variable attributes.
void ff_gradfun_filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
Definition: vf_gradfun.c:56
uint8_t
void(* filter_line)(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
DSP functions.
Definition: gradfun.h:36
void(* blur_line)(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width)
Definition: gradfun.h:37
static int cpu_flags
Definition: dct-test.c:76
static int width
Definition: utils.c:156
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:25
av_cold void ff_gradfun_init_x86(GradFunContext *gf)
Definition: gradfun.c:174