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yuv2yuv_altivec.c
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1 /*
2  * AltiVec-enhanced yuv-to-yuv conversion routines.
3  *
4  * Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
5  * based on the equivalent C code in swscale.c
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include <inttypes.h>
25 
26 #include "config.h"
27 #include "libswscale/swscale.h"
28 #include "libswscale/swscale_internal.h"
29 #include "libavutil/cpu.h"
30 
31 static int yv12toyuy2_unscaled_altivec(SwsContext *c, const uint8_t *src[],
32  int srcStride[], int srcSliceY,
33  int srcSliceH, uint8_t *dstParam[],
34  int dstStride_a[])
35 {
36  uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
37  // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
38  // srcStride[0], srcStride[1], dstStride[0]);
39  const uint8_t *ysrc = src[0];
40  const uint8_t *usrc = src[1];
41  const uint8_t *vsrc = src[2];
42  const int width = c->srcW;
43  const int height = srcSliceH;
44  const int lumStride = srcStride[0];
45  const int chromStride = srcStride[1];
46  const int dstStride = dstStride_a[0];
47  const vector unsigned char yperm = vec_lvsl(0, ysrc);
48  const int vertLumPerChroma = 2;
49  register unsigned int y;
50 
51  /* This code assumes:
52  *
53  * 1) dst is 16 bytes-aligned
54  * 2) dstStride is a multiple of 16
55  * 3) width is a multiple of 16
56  * 4) lum & chrom stride are multiples of 8
57  */
58 
59  for (y = 0; y < height; y++) {
60  int i;
61  for (i = 0; i < width - 31; i += 32) {
62  const unsigned int j = i >> 1;
63  vector unsigned char v_yA = vec_ld(i, ysrc);
64  vector unsigned char v_yB = vec_ld(i + 16, ysrc);
65  vector unsigned char v_yC = vec_ld(i + 32, ysrc);
66  vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
67  vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
68  vector unsigned char v_uA = vec_ld(j, usrc);
69  vector unsigned char v_uB = vec_ld(j + 16, usrc);
70  vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
71  vector unsigned char v_vA = vec_ld(j, vsrc);
72  vector unsigned char v_vB = vec_ld(j + 16, vsrc);
73  vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
74  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
75  vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
76  vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
77  vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
78  vector unsigned char v_yuy2_2 = vec_mergeh(v_y2, v_uv_b);
79  vector unsigned char v_yuy2_3 = vec_mergel(v_y2, v_uv_b);
80  vec_st(v_yuy2_0, (i << 1), dst);
81  vec_st(v_yuy2_1, (i << 1) + 16, dst);
82  vec_st(v_yuy2_2, (i << 1) + 32, dst);
83  vec_st(v_yuy2_3, (i << 1) + 48, dst);
84  }
85  if (i < width) {
86  const unsigned int j = i >> 1;
87  vector unsigned char v_y1 = vec_ld(i, ysrc);
88  vector unsigned char v_u = vec_ld(j, usrc);
89  vector unsigned char v_v = vec_ld(j, vsrc);
90  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
91  vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
92  vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
93  vec_st(v_yuy2_0, (i << 1), dst);
94  vec_st(v_yuy2_1, (i << 1) + 16, dst);
95  }
96  if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
97  usrc += chromStride;
98  vsrc += chromStride;
99  }
100  ysrc += lumStride;
101  dst += dstStride;
102  }
103 
104  return srcSliceH;
105 }
106 
107 static int yv12touyvy_unscaled_altivec(SwsContext *c, const uint8_t *src[],
108  int srcStride[], int srcSliceY,
109  int srcSliceH, uint8_t *dstParam[],
110  int dstStride_a[])
111 {
112  uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
113  // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
114  // srcStride[0], srcStride[1], dstStride[0]);
115  const uint8_t *ysrc = src[0];
116  const uint8_t *usrc = src[1];
117  const uint8_t *vsrc = src[2];
118  const int width = c->srcW;
119  const int height = srcSliceH;
120  const int lumStride = srcStride[0];
121  const int chromStride = srcStride[1];
122  const int dstStride = dstStride_a[0];
123  const int vertLumPerChroma = 2;
124  const vector unsigned char yperm = vec_lvsl(0, ysrc);
125  register unsigned int y;
126 
127  /* This code assumes:
128  *
129  * 1) dst is 16 bytes-aligned
130  * 2) dstStride is a multiple of 16
131  * 3) width is a multiple of 16
132  * 4) lum & chrom stride are multiples of 8
133  */
134 
135  for (y = 0; y < height; y++) {
136  int i;
137  for (i = 0; i < width - 31; i += 32) {
138  const unsigned int j = i >> 1;
139  vector unsigned char v_yA = vec_ld(i, ysrc);
140  vector unsigned char v_yB = vec_ld(i + 16, ysrc);
141  vector unsigned char v_yC = vec_ld(i + 32, ysrc);
142  vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
143  vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
144  vector unsigned char v_uA = vec_ld(j, usrc);
145  vector unsigned char v_uB = vec_ld(j + 16, usrc);
146  vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
147  vector unsigned char v_vA = vec_ld(j, vsrc);
148  vector unsigned char v_vB = vec_ld(j + 16, vsrc);
149  vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
150  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
151  vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
152  vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
153  vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
154  vector unsigned char v_uyvy_2 = vec_mergeh(v_uv_b, v_y2);
155  vector unsigned char v_uyvy_3 = vec_mergel(v_uv_b, v_y2);
156  vec_st(v_uyvy_0, (i << 1), dst);
157  vec_st(v_uyvy_1, (i << 1) + 16, dst);
158  vec_st(v_uyvy_2, (i << 1) + 32, dst);
159  vec_st(v_uyvy_3, (i << 1) + 48, dst);
160  }
161  if (i < width) {
162  const unsigned int j = i >> 1;
163  vector unsigned char v_y1 = vec_ld(i, ysrc);
164  vector unsigned char v_u = vec_ld(j, usrc);
165  vector unsigned char v_v = vec_ld(j, vsrc);
166  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
167  vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
168  vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
169  vec_st(v_uyvy_0, (i << 1), dst);
170  vec_st(v_uyvy_1, (i << 1) + 16, dst);
171  }
172  if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
173  usrc += chromStride;
174  vsrc += chromStride;
175  }
176  ysrc += lumStride;
177  dst += dstStride;
178  }
179  return srcSliceH;
180 }
181 
182 void ff_swscale_get_unscaled_altivec(SwsContext *c)
183 {
184  if ((av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) && !(c->srcW & 15) &&
185  !(c->flags & SWS_BITEXACT) && c->srcFormat == AV_PIX_FMT_YUV420P) {
186  enum AVPixelFormat dstFormat = c->dstFormat;
187 
188  // unscaled YV12 -> packed YUV, we want speed
189  if (dstFormat == AV_PIX_FMT_YUYV422)
190  c->swScale = yv12toyuy2_unscaled_altivec;
191  else if (dstFormat == AV_PIX_FMT_UYVY422)
192  c->swScale = yv12touyvy_unscaled_altivec;
193  }
194 }
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