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mpegvideodsp.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "libavutil/cpu.h"
22 #include "libavutil/x86/asm.h"
23 #include "libavutil/x86/cpu.h"
24 #include "libavcodec/mpegvideodsp.h"
25 #include "libavcodec/videodsp.h"
26 
27 #if HAVE_INLINE_ASM
28 
29 static void gmc_mmx(uint8_t *dst, uint8_t *src,
30  int stride, int h, int ox, int oy,
31  int dxx, int dxy, int dyx, int dyy,
32  int shift, int r, int width, int height)
33 {
34  const int w = 8;
35  const int ix = ox >> (16 + shift);
36  const int iy = oy >> (16 + shift);
37  const int oxs = ox >> 4;
38  const int oys = oy >> 4;
39  const int dxxs = dxx >> 4;
40  const int dxys = dxy >> 4;
41  const int dyxs = dyx >> 4;
42  const int dyys = dyy >> 4;
43  const uint16_t r4[4] = { r, r, r, r };
44  const uint16_t dxy4[4] = { dxys, dxys, dxys, dxys };
45  const uint16_t dyy4[4] = { dyys, dyys, dyys, dyys };
46  const uint64_t shift2 = 2 * shift;
47 #define MAX_STRIDE 4096U
48 #define MAX_H 8U
49  uint8_t edge_buf[(MAX_H + 1) * MAX_STRIDE];
50  int x, y;
51 
52  const int dxw = (dxx - (1 << (16 + shift))) * (w - 1);
53  const int dyh = (dyy - (1 << (16 + shift))) * (h - 1);
54  const int dxh = dxy * (h - 1);
55  const int dyw = dyx * (w - 1);
56  int need_emu = (unsigned) ix >= width - w ||
57  (unsigned) iy >= height - h;
58 
59  if ( // non-constant fullpel offset (3% of blocks)
60  ((ox ^ (ox + dxw)) | (ox ^ (ox + dxh)) | (ox ^ (ox + dxw + dxh)) |
61  (oy ^ (oy + dyw)) | (oy ^ (oy + dyh)) | (oy ^ (oy + dyw + dyh))) >> (16 + shift) ||
62  // uses more than 16 bits of subpel mv (only at huge resolution)
63  (dxx | dxy | dyx | dyy) & 15 ||
64  (need_emu && (h > MAX_H || stride > MAX_STRIDE))) {
65  // FIXME could still use mmx for some of the rows
66  ff_gmc_c(dst, src, stride, h, ox, oy, dxx, dxy, dyx, dyy,
67  shift, r, width, height);
68  return;
69  }
70 
71  src += ix + iy * stride;
72  if (need_emu) {
73  ff_emulated_edge_mc_8(edge_buf, src, stride, stride, w + 1, h + 1, ix, iy, width, height);
74  src = edge_buf;
75  }
76 
77  __asm__ volatile (
78  "movd %0, %%mm6 \n\t"
79  "pxor %%mm7, %%mm7 \n\t"
80  "punpcklwd %%mm6, %%mm6 \n\t"
81  "punpcklwd %%mm6, %%mm6 \n\t"
82  :: "r" (1 << shift));
83 
84  for (x = 0; x < w; x += 4) {
85  uint16_t dx4[4] = { oxs - dxys + dxxs * (x + 0),
86  oxs - dxys + dxxs * (x + 1),
87  oxs - dxys + dxxs * (x + 2),
88  oxs - dxys + dxxs * (x + 3) };
89  uint16_t dy4[4] = { oys - dyys + dyxs * (x + 0),
90  oys - dyys + dyxs * (x + 1),
91  oys - dyys + dyxs * (x + 2),
92  oys - dyys + dyxs * (x + 3) };
93 
94  for (y = 0; y < h; y++) {
95  __asm__ volatile (
96  "movq %0, %%mm4 \n\t"
97  "movq %1, %%mm5 \n\t"
98  "paddw %2, %%mm4 \n\t"
99  "paddw %3, %%mm5 \n\t"
100  "movq %%mm4, %0 \n\t"
101  "movq %%mm5, %1 \n\t"
102  "psrlw $12, %%mm4 \n\t"
103  "psrlw $12, %%mm5 \n\t"
104  : "+m" (*dx4), "+m" (*dy4)
105  : "m" (*dxy4), "m" (*dyy4));
106 
107  __asm__ volatile (
108  "movq %%mm6, %%mm2 \n\t"
109  "movq %%mm6, %%mm1 \n\t"
110  "psubw %%mm4, %%mm2 \n\t"
111  "psubw %%mm5, %%mm1 \n\t"
112  "movq %%mm2, %%mm0 \n\t"
113  "movq %%mm4, %%mm3 \n\t"
114  "pmullw %%mm1, %%mm0 \n\t" // (s - dx) * (s - dy)
115  "pmullw %%mm5, %%mm3 \n\t" // dx * dy
116  "pmullw %%mm5, %%mm2 \n\t" // (s - dx) * dy
117  "pmullw %%mm4, %%mm1 \n\t" // dx * (s - dy)
118 
119  "movd %4, %%mm5 \n\t"
120  "movd %3, %%mm4 \n\t"
121  "punpcklbw %%mm7, %%mm5 \n\t"
122  "punpcklbw %%mm7, %%mm4 \n\t"
123  "pmullw %%mm5, %%mm3 \n\t" // src[1, 1] * dx * dy
124  "pmullw %%mm4, %%mm2 \n\t" // src[0, 1] * (s - dx) * dy
125 
126  "movd %2, %%mm5 \n\t"
127  "movd %1, %%mm4 \n\t"
128  "punpcklbw %%mm7, %%mm5 \n\t"
129  "punpcklbw %%mm7, %%mm4 \n\t"
130  "pmullw %%mm5, %%mm1 \n\t" // src[1, 0] * dx * (s - dy)
131  "pmullw %%mm4, %%mm0 \n\t" // src[0, 0] * (s - dx) * (s - dy)
132  "paddw %5, %%mm1 \n\t"
133  "paddw %%mm3, %%mm2 \n\t"
134  "paddw %%mm1, %%mm0 \n\t"
135  "paddw %%mm2, %%mm0 \n\t"
136 
137  "psrlw %6, %%mm0 \n\t"
138  "packuswb %%mm0, %%mm0 \n\t"
139  "movd %%mm0, %0 \n\t"
140 
141  : "=m" (dst[x + y * stride])
142  : "m" (src[0]), "m" (src[1]),
143  "m" (src[stride]), "m" (src[stride + 1]),
144  "m" (*r4), "m" (shift2));
145  src += stride;
146  }
147  src += 4 - h * stride;
148  }
149 }
150 
151 #endif /* HAVE_INLINE_ASM */
152 
153 av_cold void ff_mpegvideodsp_init_x86(MpegVideoDSPContext *c)
154 {
155 #if HAVE_INLINE_ASM
156  int cpu_flags = av_get_cpu_flags();
157 
158  if (INLINE_MMX(cpu_flags))
159  c->gmc = gmc_mmx;
160 #endif /* HAVE_INLINE_ASM */
161 }
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