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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 "libavutil/attributes.h"
28 #include "libavutil/cpu.h"
29 #include "libswscale/swscale.h"
30 #include "libswscale/swscale_internal.h"
31 
32 #if HAVE_ALTIVEC
33 
34 static int yv12toyuy2_unscaled_altivec(SwsContext *c, const uint8_t *src[],
35  int srcStride[], int srcSliceY,
36  int srcSliceH, uint8_t *dstParam[],
37  int dstStride_a[])
38 {
39  uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
40  // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
41  // srcStride[0], srcStride[1], dstStride[0]);
42  const uint8_t *ysrc = src[0];
43  const uint8_t *usrc = src[1];
44  const uint8_t *vsrc = src[2];
45  const int width = c->srcW;
46  const int height = srcSliceH;
47  const int lumStride = srcStride[0];
48  const int chromStride = srcStride[1];
49  const int dstStride = dstStride_a[0];
50  const vector unsigned char yperm = vec_lvsl(0, ysrc);
51  const int vertLumPerChroma = 2;
52  register unsigned int y;
53 
54  /* This code assumes:
55  *
56  * 1) dst is 16 bytes-aligned
57  * 2) dstStride is a multiple of 16
58  * 3) width is a multiple of 16
59  * 4) lum & chrom stride are multiples of 8
60  */
61 
62  for (y = 0; y < height; y++) {
63  int i;
64  for (i = 0; i < width - 31; i += 32) {
65  const unsigned int j = i >> 1;
66  vector unsigned char v_yA = vec_ld(i, ysrc);
67  vector unsigned char v_yB = vec_ld(i + 16, ysrc);
68  vector unsigned char v_yC = vec_ld(i + 32, ysrc);
69  vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
70  vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
71  vector unsigned char v_uA = vec_ld(j, usrc);
72  vector unsigned char v_uB = vec_ld(j + 16, usrc);
73  vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
74  vector unsigned char v_vA = vec_ld(j, vsrc);
75  vector unsigned char v_vB = vec_ld(j + 16, vsrc);
76  vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
77  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
78  vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
79  vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
80  vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
81  vector unsigned char v_yuy2_2 = vec_mergeh(v_y2, v_uv_b);
82  vector unsigned char v_yuy2_3 = vec_mergel(v_y2, v_uv_b);
83  vec_st(v_yuy2_0, (i << 1), dst);
84  vec_st(v_yuy2_1, (i << 1) + 16, dst);
85  vec_st(v_yuy2_2, (i << 1) + 32, dst);
86  vec_st(v_yuy2_3, (i << 1) + 48, dst);
87  }
88  if (i < width) {
89  const unsigned int j = i >> 1;
90  vector unsigned char v_y1 = vec_ld(i, ysrc);
91  vector unsigned char v_u = vec_ld(j, usrc);
92  vector unsigned char v_v = vec_ld(j, vsrc);
93  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
94  vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
95  vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
96  vec_st(v_yuy2_0, (i << 1), dst);
97  vec_st(v_yuy2_1, (i << 1) + 16, dst);
98  }
99  if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
100  usrc += chromStride;
101  vsrc += chromStride;
102  }
103  ysrc += lumStride;
104  dst += dstStride;
105  }
106 
107  return srcSliceH;
108 }
109 
110 static int yv12touyvy_unscaled_altivec(SwsContext *c, const uint8_t *src[],
111  int srcStride[], int srcSliceY,
112  int srcSliceH, uint8_t *dstParam[],
113  int dstStride_a[])
114 {
115  uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
116  // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
117  // srcStride[0], srcStride[1], dstStride[0]);
118  const uint8_t *ysrc = src[0];
119  const uint8_t *usrc = src[1];
120  const uint8_t *vsrc = src[2];
121  const int width = c->srcW;
122  const int height = srcSliceH;
123  const int lumStride = srcStride[0];
124  const int chromStride = srcStride[1];
125  const int dstStride = dstStride_a[0];
126  const int vertLumPerChroma = 2;
127  const vector unsigned char yperm = vec_lvsl(0, ysrc);
128  register unsigned int y;
129 
130  /* This code assumes:
131  *
132  * 1) dst is 16 bytes-aligned
133  * 2) dstStride is a multiple of 16
134  * 3) width is a multiple of 16
135  * 4) lum & chrom stride are multiples of 8
136  */
137 
138  for (y = 0; y < height; y++) {
139  int i;
140  for (i = 0; i < width - 31; i += 32) {
141  const unsigned int j = i >> 1;
142  vector unsigned char v_yA = vec_ld(i, ysrc);
143  vector unsigned char v_yB = vec_ld(i + 16, ysrc);
144  vector unsigned char v_yC = vec_ld(i + 32, ysrc);
145  vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
146  vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
147  vector unsigned char v_uA = vec_ld(j, usrc);
148  vector unsigned char v_uB = vec_ld(j + 16, usrc);
149  vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
150  vector unsigned char v_vA = vec_ld(j, vsrc);
151  vector unsigned char v_vB = vec_ld(j + 16, vsrc);
152  vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
153  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
154  vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
155  vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
156  vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
157  vector unsigned char v_uyvy_2 = vec_mergeh(v_uv_b, v_y2);
158  vector unsigned char v_uyvy_3 = vec_mergel(v_uv_b, v_y2);
159  vec_st(v_uyvy_0, (i << 1), dst);
160  vec_st(v_uyvy_1, (i << 1) + 16, dst);
161  vec_st(v_uyvy_2, (i << 1) + 32, dst);
162  vec_st(v_uyvy_3, (i << 1) + 48, dst);
163  }
164  if (i < width) {
165  const unsigned int j = i >> 1;
166  vector unsigned char v_y1 = vec_ld(i, ysrc);
167  vector unsigned char v_u = vec_ld(j, usrc);
168  vector unsigned char v_v = vec_ld(j, vsrc);
169  vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
170  vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
171  vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
172  vec_st(v_uyvy_0, (i << 1), dst);
173  vec_st(v_uyvy_1, (i << 1) + 16, dst);
174  }
175  if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
176  usrc += chromStride;
177  vsrc += chromStride;
178  }
179  ysrc += lumStride;
180  dst += dstStride;
181  }
182  return srcSliceH;
183 }
184 
185 #endif /* HAVE_ALTIVEC */
186 
187 av_cold void ff_get_unscaled_swscale_ppc(SwsContext *c)
188 {
189 #if HAVE_ALTIVEC
190  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
191  return;
192 
193  if (!(c->srcW & 15) && !(c->flags & SWS_BITEXACT) &&
194  c->srcFormat == AV_PIX_FMT_YUV420P) {
195  enum AVPixelFormat dstFormat = c->dstFormat;
196 
197  // unscaled YV12 -> packed YUV, we want speed
198  if (dstFormat == AV_PIX_FMT_YUYV422)
199  c->swscale = yv12toyuy2_unscaled_altivec;
200  else if (dstFormat == AV_PIX_FMT_UYVY422)
201  c->swscale = yv12touyvy_unscaled_altivec;
202  }
203 #endif /* HAVE_ALTIVEC */
204 }
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