FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
huffyuvencdsp_mmx.c
Go to the documentation of this file.
1 /*
2  * SIMD-optimized HuffYUV encoding functions
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * MMX optimization by Nick Kurshev <nickols_k@mail.ru>
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/x86/asm.h"
28 #include "libavutil/x86/cpu.h"
30 #include "libavcodec/mathops.h"
31 
32 #if HAVE_INLINE_ASM
33 
34 static void diff_bytes_mmx(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int w)
35 {
36  x86_reg i = 0;
37 
38  if (w >= 16)
39  __asm__ volatile (
40  "1: \n\t"
41  "movq (%2, %0), %%mm0 \n\t"
42  "movq (%1, %0), %%mm1 \n\t"
43  "psubb %%mm0, %%mm1 \n\t"
44  "movq %%mm1, (%3, %0) \n\t"
45  "movq 8(%2, %0), %%mm0 \n\t"
46  "movq 8(%1, %0), %%mm1 \n\t"
47  "psubb %%mm0, %%mm1 \n\t"
48  "movq %%mm1, 8(%3, %0) \n\t"
49  "add $16, %0 \n\t"
50  "cmp %4, %0 \n\t"
51  " jb 1b \n\t"
52  : "+r" (i)
53  : "r" (src1), "r" (src2), "r" (dst), "r" ((x86_reg) w - 15));
54 
55  for (; i < w; i++)
56  dst[i + 0] = src1[i + 0] - src2[i + 0];
57 }
58 
59 static void sub_hfyu_median_pred_mmxext(uint8_t *dst, const uint8_t *src1,
60  const uint8_t *src2, int w,
61  int *left, int *left_top)
62 {
63  x86_reg i = 0;
64  uint8_t l, lt;
65 
66  __asm__ volatile (
67  "movq (%1, %0), %%mm0 \n\t" // LT
68  "psllq $8, %%mm0 \n\t"
69  "1: \n\t"
70  "movq (%1, %0), %%mm1 \n\t" // T
71  "movq -1(%2, %0), %%mm2 \n\t" // L
72  "movq (%2, %0), %%mm3 \n\t" // X
73  "movq %%mm2, %%mm4 \n\t" // L
74  "psubb %%mm0, %%mm2 \n\t"
75  "paddb %%mm1, %%mm2 \n\t" // L + T - LT
76  "movq %%mm4, %%mm5 \n\t" // L
77  "pmaxub %%mm1, %%mm4 \n\t" // max(T, L)
78  "pminub %%mm5, %%mm1 \n\t" // min(T, L)
79  "pminub %%mm2, %%mm4 \n\t"
80  "pmaxub %%mm1, %%mm4 \n\t"
81  "psubb %%mm4, %%mm3 \n\t" // dst - pred
82  "movq %%mm3, (%3, %0) \n\t"
83  "add $8, %0 \n\t"
84  "movq -1(%1, %0), %%mm0 \n\t" // LT
85  "cmp %4, %0 \n\t"
86  " jb 1b \n\t"
87  : "+r" (i)
88  : "r" (src1), "r" (src2), "r" (dst), "r" ((x86_reg) w));
89 
90  l = *left;
91  lt = *left_top;
92 
93  dst[0] = src2[0] - mid_pred(l, src1[0], (l + src1[0] - lt) & 0xFF);
94 
95  *left_top = src1[w - 1];
96  *left = src2[w - 1];
97 }
98 
99 #endif /* HAVE_INLINE_ASM */
100 
102 {
103 #if HAVE_INLINE_ASM
104  int cpu_flags = av_get_cpu_flags();
105 
106  if (INLINE_MMX(cpu_flags)) {
107  c->diff_bytes = diff_bytes_mmx;
108  }
109 
110  if (INLINE_MMXEXT(cpu_flags)) {
111  c->sub_hfyu_median_pred = sub_hfyu_median_pred_mmxext;
112  }
113 #endif /* HAVE_INLINE_ASM */
114 }