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vf_gradfun.c
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1 /*
2  * Copyright (C) 2009 Loren Merritt <lorenm@u.washignton.edu>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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, const uint8_t *src, const 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), %%mm3 \n"
50  "movq 8(%5), %%mm4 \n"
51 
52  "1: \n"
53  "movd (%2,%0), %%mm0 \n"
54  "movd (%3,%0), %%mm1 \n"
55  "punpcklbw %%mm7, %%mm0 \n"
56  "punpcklwd %%mm1, %%mm1 \n"
57  "psllw $7, %%mm0 \n"
58  "pxor %%mm2, %%mm2 \n"
59  "psubw %%mm0, %%mm1 \n" // delta = dc - pix
60  "psubw %%mm1, %%mm2 \n"
61  "pmaxsw %%mm1, %%mm2 \n"
62  "pmulhuw %%mm5, %%mm2 \n" // m = abs(delta) * thresh >> 16
63  "psubw %%mm6, %%mm2 \n"
64  "pminsw %%mm7, %%mm2 \n" // m = -max(0, 127-m)
65  "pmullw %%mm2, %%mm2 \n"
66  "paddw %%mm3, %%mm0 \n" // pix += dither
67  "psllw $2, %%mm1 \n" // m = m*m*delta >> 14
68  "pmulhw %%mm2, %%mm1 \n"
69  "paddw %%mm1, %%mm0 \n" // pix += m
70  "psraw $7, %%mm0 \n"
71  "packuswb %%mm0, %%mm0 \n"
72  "movd %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
73  "add $4, %0 \n"
74  "jnl 2f \n"
75 
76  "movd (%2,%0), %%mm0 \n"
77  "movd (%3,%0), %%mm1 \n"
78  "punpcklbw %%mm7, %%mm0 \n"
79  "punpcklwd %%mm1, %%mm1 \n"
80  "psllw $7, %%mm0 \n"
81  "pxor %%mm2, %%mm2 \n"
82  "psubw %%mm0, %%mm1 \n" // delta = dc - pix
83  "psubw %%mm1, %%mm2 \n"
84  "pmaxsw %%mm1, %%mm2 \n"
85  "pmulhuw %%mm5, %%mm2 \n" // m = abs(delta) * thresh >> 16
86  "psubw %%mm6, %%mm2 \n"
87  "pminsw %%mm7, %%mm2 \n" // m = -max(0, 127-m)
88  "pmullw %%mm2, %%mm2 \n"
89  "paddw %%mm4, %%mm0 \n" // pix += dither
90  "psllw $2, %%mm1 \n" // m = m*m*delta >> 14
91  "pmulhw %%mm2, %%mm1 \n"
92  "paddw %%mm1, %%mm0 \n" // pix += m
93  "psraw $7, %%mm0 \n"
94  "packuswb %%mm0, %%mm0 \n"
95  "movd %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
96  "add $4, %0 \n"
97  "jl 1b \n"
98 
99  "2: \n"
100  "emms \n"
101  :"+r"(x)
102  :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
103  "rm"(thresh), "r"(dithers), "m"(*pw_7f)
104  :"memory"
105  );
106 }
107 #endif
108 
109 #if HAVE_SSSE3_INLINE
110 static void gradfun_filter_line_ssse3(uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers)
111 {
112  intptr_t x;
113  if (width & 7) {
114  // could be 10% faster if I somehow eliminated this
115  x = width & ~7;
116  ff_gradfun_filter_line_c(dst + x, src + x, dc + x / 2, width - x, thresh, dithers);
117  width = x;
118  }
119  x = -width;
120  __asm__ volatile(
121  "movd %4, %%xmm5 \n"
122  "pxor %%xmm7, %%xmm7 \n"
123  "pshuflw $0,%%xmm5, %%xmm5 \n"
124  "movdqa %6, %%xmm6 \n"
125  "punpcklqdq %%xmm5, %%xmm5 \n"
126  "movdqa %5, %%xmm4 \n"
127  "1: \n"
128  "movq (%2,%0), %%xmm0 \n"
129  "movq (%3,%0), %%xmm1 \n"
130  "punpcklbw %%xmm7, %%xmm0 \n"
131  "punpcklwd %%xmm1, %%xmm1 \n"
132  "psllw $7, %%xmm0 \n"
133  "psubw %%xmm0, %%xmm1 \n" // delta = dc - pix
134  "pabsw %%xmm1, %%xmm2 \n"
135  "pmulhuw %%xmm5, %%xmm2 \n" // m = abs(delta) * thresh >> 16
136  "psubw %%xmm6, %%xmm2 \n"
137  "pminsw %%xmm7, %%xmm2 \n" // m = -max(0, 127-m)
138  "pmullw %%xmm2, %%xmm2 \n"
139  "psllw $2, %%xmm1 \n"
140  "paddw %%xmm4, %%xmm0 \n" // pix += dither
141  "pmulhw %%xmm2, %%xmm1 \n" // m = m*m*delta >> 14
142  "paddw %%xmm1, %%xmm0 \n" // pix += m
143  "psraw $7, %%xmm0 \n"
144  "packuswb %%xmm0, %%xmm0 \n"
145  "movq %%xmm0, (%1,%0) \n" // dst = clip(pix>>7)
146  "add $8, %0 \n"
147  "jl 1b \n"
148  :"+&r"(x)
149  :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
150  "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
151  :"memory"
152  );
153 }
154 #endif /* HAVE_SSSE3_INLINE */
155 
156 #if HAVE_SSE2_INLINE
157 static void gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width)
158 {
159 #define BLURV(load)\
160  intptr_t x = -2*width;\
161  __asm__ volatile(\
162  "movdqa %6, %%xmm7 \n"\
163  "1: \n"\
164  load" (%4,%0), %%xmm0 \n"\
165  load" (%5,%0), %%xmm1 \n"\
166  "movdqa %%xmm0, %%xmm2 \n"\
167  "movdqa %%xmm1, %%xmm3 \n"\
168  "psrlw $8, %%xmm0 \n"\
169  "psrlw $8, %%xmm1 \n"\
170  "pand %%xmm7, %%xmm2 \n"\
171  "pand %%xmm7, %%xmm3 \n"\
172  "paddw %%xmm1, %%xmm0 \n"\
173  "paddw %%xmm3, %%xmm2 \n"\
174  "paddw %%xmm2, %%xmm0 \n"\
175  "paddw (%2,%0), %%xmm0 \n"\
176  "movdqa (%1,%0), %%xmm1 \n"\
177  "movdqa %%xmm0, (%1,%0) \n"\
178  "psubw %%xmm1, %%xmm0 \n"\
179  "movdqa %%xmm0, (%3,%0) \n"\
180  "add $16, %0 \n"\
181  "jl 1b \n"\
182  :"+&r"(x)\
183  :"r"(buf+width),\
184  "r"(buf1+width),\
185  "r"(dc+width),\
186  "r"(src+width*2),\
187  "r"(src+width*2+src_linesize),\
188  "m"(*pw_ff)\
189  :"memory"\
190  );
191  if (((intptr_t) src | src_linesize) & 15) {
192  BLURV("movdqu");
193  } else {
194  BLURV("movdqa");
195  }
196 }
197 #endif /* HAVE_SSE2_INLINE */
198 
199 #endif /* HAVE_INLINE_ASM */
200 
201 av_cold void ff_gradfun_init_x86(GradFunContext *gf)
202 {
203  int cpu_flags = av_get_cpu_flags();
204 
205 #if HAVE_MMXEXT_INLINE
206  if (cpu_flags & AV_CPU_FLAG_MMXEXT)
207  gf->filter_line = gradfun_filter_line_mmxext;
208 #endif
209 #if HAVE_SSSE3_INLINE
210  if (cpu_flags & AV_CPU_FLAG_SSSE3)
211  gf->filter_line = gradfun_filter_line_ssse3;
212 #endif
213 #if HAVE_SSE2_INLINE
214  if (cpu_flags & AV_CPU_FLAG_SSE2)
215  gf->blur_line = gradfun_blur_line_sse2;
216 #endif
217 }
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