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vf_eq.c
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1 /*
2  *
3  * Original MPlayer filters by Richard Felker.
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20  */
21 
22 #include "libavutil/attributes.h"
23 #include "libavutil/cpu.h"
24 #include "libavutil/mem.h"
25 #include "libavutil/x86/asm.h"
26 #include "libavfilter/vf_eq.h"
27 
28 #if HAVE_MMX_INLINE && HAVE_6REGS
29 static void process_MMX(EQParameters *param, uint8_t *dst, int dst_stride,
30  const uint8_t *src, int src_stride, int w, int h)
31 {
32  int i;
33  int pel;
34  int dstep = dst_stride - w;
35  int sstep = src_stride - w;
36  short brvec[4];
37  short contvec[4];
38  int contrast = (int) (param->contrast * 256 * 16);
39  int brightness = ((int) (100.0 * param->brightness + 100.0) * 511) / 200 - 128 - contrast / 32;
40 
41  brvec[0] = brvec[1] = brvec[2] = brvec[3] = brightness;
42  contvec[0] = contvec[1] = contvec[2] = contvec[3] = contrast;
43 
44  while (h--) {
45  __asm__ volatile (
46  "movq (%5), %%mm3 \n\t"
47  "movq (%6), %%mm4 \n\t"
48  "pxor %%mm0, %%mm0 \n\t"
49  "movl %4, %%eax \n\t"
50  ".p2align 4 \n\t"
51  "1: \n\t"
52  "movq (%0), %%mm1 \n\t"
53  "movq (%0), %%mm2 \n\t"
54  "punpcklbw %%mm0, %%mm1\n\t"
55  "punpckhbw %%mm0, %%mm2\n\t"
56  "psllw $4, %%mm1 \n\t"
57  "psllw $4, %%mm2 \n\t"
58  "pmulhw %%mm4, %%mm1 \n\t"
59  "pmulhw %%mm4, %%mm2 \n\t"
60  "paddw %%mm3, %%mm1 \n\t"
61  "paddw %%mm3, %%mm2 \n\t"
62  "packuswb %%mm2, %%mm1 \n\t"
63  "add $8, %0 \n\t"
64  "movq %%mm1, (%1) \n\t"
65  "add $8, %1 \n\t"
66  "decl %%eax \n\t"
67  "jnz 1b \n\t"
68  : "=r" (src), "=r" (dst)
69  : "0" (src), "1" (dst), "r" (w>>3), "r" (brvec), "r" (contvec)
70  : "%eax"
71  );
72 
73  for (i = w&7; i; i--) {
74  pel = ((*src++ * contrast) >> 12) + brightness;
75  if (pel & ~255)
76  pel = (-pel) >> 31;
77  *dst++ = pel;
78  }
79 
80  src += sstep;
81  dst += dstep;
82  }
83  __asm__ volatile ( "emms \n\t" ::: "memory" );
84 }
85 #endif
86 
88 {
89 #if HAVE_MMX_INLINE && HAVE_6REGS
90  int cpu_flags = av_get_cpu_flags();
91 
92  if (cpu_flags & AV_CPU_FLAG_MMX) {
93  eq->process = process_MMX;
94  }
95 #endif
96 }