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swscale_altivec.c
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1 /*
2  * AltiVec-enhanced yuv2yuvX
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/attributes.h"
30 #include "libavutil/cpu.h"
31 #include "yuv2rgb_altivec.h"
32 
33 #define vzero vec_splat_s32(0)
34 
35 #define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do { \
36  vector signed short l2 = vec_ld(((x) << 1) + 16, src); \
37  vector signed short ls = vec_perm(l1, l2, perm); \
38  vector signed int i1 = vec_mule(filter, ls); \
39  vector signed int i2 = vec_mulo(filter, ls); \
40  vector signed int vf1 = vec_mergeh(i1, i2); \
41  vector signed int vf2 = vec_mergel(i1, i2); \
42  d1 = vec_add(d1, vf1); \
43  d2 = vec_add(d2, vf2); \
44  l1 = l2; \
45  } while (0)
46 
47 static void yuv2planeX_16_altivec(const int16_t *filter, int filterSize,
48  const int16_t **src, uint8_t *dest,
49  const uint8_t *dither, int offset, int x)
50 {
51  register int i, j;
52  DECLARE_ALIGNED(16, int, val)[16];
53  vector signed int vo1, vo2, vo3, vo4;
54  vector unsigned short vs1, vs2;
55  vector unsigned char vf;
56  vector unsigned int altivec_vectorShiftInt19 =
57  vec_add(vec_splat_u32(10), vec_splat_u32(9));
58 
59  for (i = 0; i < 16; i++)
60  val[i] = dither[(x + i + offset) & 7] << 12;
61 
62  vo1 = vec_ld(0, val);
63  vo2 = vec_ld(16, val);
64  vo3 = vec_ld(32, val);
65  vo4 = vec_ld(48, val);
66 
67  for (j = 0; j < filterSize; j++) {
68  vector signed short l1, vLumFilter = vec_ld(j << 1, filter);
69  vector unsigned char perm, perm0 = vec_lvsl(j << 1, filter);
70  vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
71  vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter
72 
73  perm = vec_lvsl(x << 1, src[j]);
74  l1 = vec_ld(x << 1, src[j]);
75 
76  yuv2planeX_8(vo1, vo2, l1, src[j], x, perm, vLumFilter);
77  yuv2planeX_8(vo3, vo4, l1, src[j], x + 8, perm, vLumFilter);
78  }
79 
80  vo1 = vec_sra(vo1, altivec_vectorShiftInt19);
81  vo2 = vec_sra(vo2, altivec_vectorShiftInt19);
82  vo3 = vec_sra(vo3, altivec_vectorShiftInt19);
83  vo4 = vec_sra(vo4, altivec_vectorShiftInt19);
84  vs1 = vec_packsu(vo1, vo2);
85  vs2 = vec_packsu(vo3, vo4);
86  vf = vec_packsu(vs1, vs2);
87  vec_st(vf, 0, dest);
88 }
89 
90 static inline void yuv2planeX_u(const int16_t *filter, int filterSize,
91  const int16_t **src, uint8_t *dest, int dstW,
92  const uint8_t *dither, int offset, int x)
93 {
94  int i, j;
95 
96  for (i = x; i < dstW; i++) {
97  int t = dither[(i + offset) & 7] << 12;
98  for (j = 0; j < filterSize; j++)
99  t += src[j][i] * filter[j];
100  dest[i] = av_clip_uint8(t >> 19);
101  }
102 }
103 
104 static void yuv2planeX_altivec(const int16_t *filter, int filterSize,
105  const int16_t **src, uint8_t *dest, int dstW,
106  const uint8_t *dither, int offset)
107 {
108  int dst_u = -(uintptr_t)dest & 15;
109  int i;
110 
111  yuv2planeX_u(filter, filterSize, src, dest, dst_u, dither, offset, 0);
112 
113  for (i = dst_u; i < dstW - 15; i += 16)
114  yuv2planeX_16_altivec(filter, filterSize, src, dest + i, dither,
115  offset, i);
116 
117  yuv2planeX_u(filter, filterSize, src, dest, dstW, dither, offset, i);
118 }
119 
120 static void hScale_altivec_real(SwsContext *c, int16_t *dst, int dstW,
121  const uint8_t *src, const int16_t *filter,
122  const int32_t *filterPos, int filterSize)
123 {
124  register int i;
125  DECLARE_ALIGNED(16, int, tempo)[4];
126 
127  if (filterSize % 4) {
128  for (i = 0; i < dstW; i++) {
129  register int j;
130  register int srcPos = filterPos[i];
131  register int val = 0;
132  for (j = 0; j < filterSize; j++)
133  val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
134  dst[i] = FFMIN(val >> 7, (1 << 15) - 1);
135  }
136  } else
137  switch (filterSize) {
138  case 4:
139  for (i = 0; i < dstW; i++) {
140  register int srcPos = filterPos[i];
141 
142  vector unsigned char src_v0 = vec_ld(srcPos, src);
143  vector unsigned char src_v1, src_vF;
144  vector signed short src_v, filter_v;
145  vector signed int val_vEven, val_s;
146  if ((((uintptr_t)src + srcPos) % 16) > 12) {
147  src_v1 = vec_ld(srcPos + 16, src);
148  }
149  src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
150 
151  src_v = // vec_unpackh sign-extends...
152  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
153  // now put our elements in the even slots
154  src_v = vec_mergeh(src_v, (vector signed short)vzero);
155 
156  filter_v = vec_ld(i << 3, filter);
157  // The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
158 
159  // The neat trick: We only care for half the elements,
160  // high or low depending on (i<<3)%16 (it's 0 or 8 here),
161  // and we're going to use vec_mule, so we choose
162  // carefully how to "unpack" the elements into the even slots.
163  if ((i << 3) % 16)
164  filter_v = vec_mergel(filter_v, (vector signed short)vzero);
165  else
166  filter_v = vec_mergeh(filter_v, (vector signed short)vzero);
167 
168  val_vEven = vec_mule(src_v, filter_v);
169  val_s = vec_sums(val_vEven, vzero);
170  vec_st(val_s, 0, tempo);
171  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
172  }
173  break;
174 
175  case 8:
176  for (i = 0; i < dstW; i++) {
177  register int srcPos = filterPos[i];
178 
179  vector unsigned char src_v0 = vec_ld(srcPos, src);
180  vector unsigned char src_v1, src_vF;
181  vector signed short src_v, filter_v;
182  vector signed int val_v, val_s;
183  if ((((uintptr_t)src + srcPos) % 16) > 8) {
184  src_v1 = vec_ld(srcPos + 16, src);
185  }
186  src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
187 
188  src_v = // vec_unpackh sign-extends...
189  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
190  filter_v = vec_ld(i << 4, filter);
191  // the 4 above is 3 (filterSize == 8) + 1 (sizeof(short) == 2)
192 
193  val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
194  val_s = vec_sums(val_v, vzero);
195  vec_st(val_s, 0, tempo);
196  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
197  }
198  break;
199 
200  case 16:
201  for (i = 0; i < dstW; i++) {
202  register int srcPos = filterPos[i];
203 
204  vector unsigned char src_v0 = vec_ld(srcPos, src);
205  vector unsigned char src_v1 = vec_ld(srcPos + 16, src);
206  vector unsigned char src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
207 
208  vector signed short src_vA = // vec_unpackh sign-extends...
209  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
210  vector signed short src_vB = // vec_unpackh sign-extends...
211  (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
212 
213  vector signed short filter_v0 = vec_ld(i << 5, filter);
214  vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
215  // the 5 above are 4 (filterSize == 16) + 1 (sizeof(short) == 2)
216 
217  vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
218  vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
219 
220  vector signed int val_s = vec_sums(val_v, vzero);
221 
222  vec_st(val_s, 0, tempo);
223  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
224  }
225  break;
226 
227  default:
228  for (i = 0; i < dstW; i++) {
229  register int j;
230  register int srcPos = filterPos[i];
231 
232  vector signed int val_s, val_v = (vector signed int)vzero;
233  vector signed short filter_v0R = vec_ld(i * 2 * filterSize, filter);
234  vector unsigned char permF = vec_lvsl((i * 2 * filterSize), filter);
235 
236  vector unsigned char src_v0 = vec_ld(srcPos, src);
237  vector unsigned char permS = vec_lvsl(srcPos, src);
238 
239  for (j = 0; j < filterSize - 15; j += 16) {
240  vector unsigned char src_v1 = vec_ld(srcPos + j + 16, src);
241  vector unsigned char src_vF = vec_perm(src_v0, src_v1, permS);
242 
243  vector signed short src_vA = // vec_unpackh sign-extends...
244  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
245  vector signed short src_vB = // vec_unpackh sign-extends...
246  (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
247 
248  vector signed short filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
249  vector signed short filter_v2R = vec_ld((i * 2 * filterSize) + (j * 2) + 32, filter);
250  vector signed short filter_v0 = vec_perm(filter_v0R, filter_v1R, permF);
251  vector signed short filter_v1 = vec_perm(filter_v1R, filter_v2R, permF);
252 
253  vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
254  val_v = vec_msums(src_vB, filter_v1, val_acc);
255 
256  filter_v0R = filter_v2R;
257  src_v0 = src_v1;
258  }
259 
260  if (j < filterSize - 7) {
261  // loading src_v0 is useless, it's already done above
262  // vector unsigned char src_v0 = vec_ld(srcPos + j, src);
263  vector unsigned char src_v1, src_vF;
264  vector signed short src_v, filter_v1R, filter_v;
265  if ((((uintptr_t)src + srcPos) % 16) > 8) {
266  src_v1 = vec_ld(srcPos + j + 16, src);
267  }
268  src_vF = vec_perm(src_v0, src_v1, permS);
269 
270  src_v = // vec_unpackh sign-extends...
271  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
272  // loading filter_v0R is useless, it's already done above
273  // vector signed short filter_v0R = vec_ld((i * 2 * filterSize) + j, filter);
274  filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
275  filter_v = vec_perm(filter_v0R, filter_v1R, permF);
276 
277  val_v = vec_msums(src_v, filter_v, val_v);
278  }
279 
280  val_s = vec_sums(val_v, vzero);
281 
282  vec_st(val_s, 0, tempo);
283  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
284  }
285  }
286 }
287 
288 av_cold void ff_sws_init_swScale_altivec(SwsContext *c)
289 {
290  enum AVPixelFormat dstFormat = c->dstFormat;
291 
292  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
293  return;
294 
295  if (c->srcBpc == 8 && c->dstBpc <= 14) {
296  c->hyScale = c->hcScale = hScale_altivec_real;
297  }
298  if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat) &&
299  dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&
300  !c->alpPixBuf) {
301  c->yuv2planeX = yuv2planeX_altivec;
302  }
303 
304  /* The following list of supported dstFormat values should
305  * match what's found in the body of ff_yuv2packedX_altivec() */
306  if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->alpPixBuf) {
307  switch (c->dstFormat) {
308  case AV_PIX_FMT_ABGR:
309  c->yuv2packedX = ff_yuv2abgr_X_altivec;
310  break;
311  case AV_PIX_FMT_BGRA:
312  c->yuv2packedX = ff_yuv2bgra_X_altivec;
313  break;
314  case AV_PIX_FMT_ARGB:
315  c->yuv2packedX = ff_yuv2argb_X_altivec;
316  break;
317  case AV_PIX_FMT_RGBA:
318  c->yuv2packedX = ff_yuv2rgba_X_altivec;
319  break;
320  case AV_PIX_FMT_BGR24:
321  c->yuv2packedX = ff_yuv2bgr24_X_altivec;
322  break;
323  case AV_PIX_FMT_RGB24:
324  c->yuv2packedX = ff_yuv2rgb24_X_altivec;
325  break;
326  }
327  }
328 }
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