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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 #if HAVE_ALTIVEC
34 #define vzero vec_splat_s32(0)
35 
36 #define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do { \
37  vector signed short l2 = vec_ld(((x) << 1) + 16, src); \
38  vector signed short ls = vec_perm(l1, l2, perm); \
39  vector signed int i1 = vec_mule(filter, ls); \
40  vector signed int i2 = vec_mulo(filter, ls); \
41  vector signed int vf1 = vec_mergeh(i1, i2); \
42  vector signed int vf2 = vec_mergel(i1, i2); \
43  d1 = vec_add(d1, vf1); \
44  d2 = vec_add(d2, vf2); \
45  l1 = l2; \
46  } while (0)
47 
48 static void yuv2planeX_16_altivec(const int16_t *filter, int filterSize,
49  const int16_t **src, uint8_t *dest,
50  const uint8_t *dither, int offset, int x)
51 {
52  register int i, j;
53  DECLARE_ALIGNED(16, int, val)[16];
54  vector signed int vo1, vo2, vo3, vo4;
55  vector unsigned short vs1, vs2;
56  vector unsigned char vf;
57  vector unsigned int altivec_vectorShiftInt19 =
58  vec_add(vec_splat_u32(10), vec_splat_u32(9));
59 
60  for (i = 0; i < 16; i++)
61  val[i] = dither[(x + i + offset) & 7] << 12;
62 
63  vo1 = vec_ld(0, val);
64  vo2 = vec_ld(16, val);
65  vo3 = vec_ld(32, val);
66  vo4 = vec_ld(48, val);
67 
68  for (j = 0; j < filterSize; j++) {
69  vector signed short l1, vLumFilter = vec_ld(j << 1, filter);
70  vector unsigned char perm, perm0 = vec_lvsl(j << 1, filter);
71  vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
72  vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter
73 
74  perm = vec_lvsl(x << 1, src[j]);
75  l1 = vec_ld(x << 1, src[j]);
76 
77  yuv2planeX_8(vo1, vo2, l1, src[j], x, perm, vLumFilter);
78  yuv2planeX_8(vo3, vo4, l1, src[j], x + 8, perm, vLumFilter);
79  }
80 
81  vo1 = vec_sra(vo1, altivec_vectorShiftInt19);
82  vo2 = vec_sra(vo2, altivec_vectorShiftInt19);
83  vo3 = vec_sra(vo3, altivec_vectorShiftInt19);
84  vo4 = vec_sra(vo4, altivec_vectorShiftInt19);
85  vs1 = vec_packsu(vo1, vo2);
86  vs2 = vec_packsu(vo3, vo4);
87  vf = vec_packsu(vs1, vs2);
88  vec_st(vf, 0, dest);
89 }
90 
91 static inline void yuv2planeX_u(const int16_t *filter, int filterSize,
92  const int16_t **src, uint8_t *dest, int dstW,
93  const uint8_t *dither, int offset, int x)
94 {
95  int i, j;
96 
97  for (i = x; i < dstW; i++) {
98  int t = dither[(i + offset) & 7] << 12;
99  for (j = 0; j < filterSize; j++)
100  t += src[j][i] * filter[j];
101  dest[i] = av_clip_uint8(t >> 19);
102  }
103 }
104 
105 static void yuv2planeX_altivec(const int16_t *filter, int filterSize,
106  const int16_t **src, uint8_t *dest, int dstW,
107  const uint8_t *dither, int offset)
108 {
109  int dst_u = -(uintptr_t)dest & 15;
110  int i;
111 
112  yuv2planeX_u(filter, filterSize, src, dest, dst_u, dither, offset, 0);
113 
114  for (i = dst_u; i < dstW - 15; i += 16)
115  yuv2planeX_16_altivec(filter, filterSize, src, dest + i, dither,
116  offset, i);
117 
118  yuv2planeX_u(filter, filterSize, src, dest, dstW, dither, offset, i);
119 }
120 
121 static void hScale_altivec_real(SwsContext *c, int16_t *dst, int dstW,
122  const uint8_t *src, const int16_t *filter,
123  const int32_t *filterPos, int filterSize)
124 {
125  register int i;
126  DECLARE_ALIGNED(16, int, tempo)[4];
127 
128  if (filterSize % 4) {
129  for (i = 0; i < dstW; i++) {
130  register int j;
131  register int srcPos = filterPos[i];
132  register int val = 0;
133  for (j = 0; j < filterSize; j++)
134  val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
135  dst[i] = FFMIN(val >> 7, (1 << 15) - 1);
136  }
137  } else
138  switch (filterSize) {
139  case 4:
140  for (i = 0; i < dstW; i++) {
141  register int srcPos = filterPos[i];
142 
143  vector unsigned char src_v0 = vec_ld(srcPos, src);
144  vector unsigned char src_v1, src_vF;
145  vector signed short src_v, filter_v;
146  vector signed int val_vEven, val_s;
147  if ((((uintptr_t)src + srcPos) % 16) > 12) {
148  src_v1 = vec_ld(srcPos + 16, src);
149  }
150  src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
151 
152  src_v = // vec_unpackh sign-extends...
153  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
154  // now put our elements in the even slots
155  src_v = vec_mergeh(src_v, (vector signed short)vzero);
156 
157  filter_v = vec_ld(i << 3, filter);
158  // The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
159 
160  // The neat trick: We only care for half the elements,
161  // high or low depending on (i<<3)%16 (it's 0 or 8 here),
162  // and we're going to use vec_mule, so we choose
163  // carefully how to "unpack" the elements into the even slots.
164  if ((i << 3) % 16)
165  filter_v = vec_mergel(filter_v, (vector signed short)vzero);
166  else
167  filter_v = vec_mergeh(filter_v, (vector signed short)vzero);
168 
169  val_vEven = vec_mule(src_v, filter_v);
170  val_s = vec_sums(val_vEven, vzero);
171  vec_st(val_s, 0, tempo);
172  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
173  }
174  break;
175 
176  case 8:
177  for (i = 0; i < dstW; i++) {
178  register int srcPos = filterPos[i];
179 
180  vector unsigned char src_v0 = vec_ld(srcPos, src);
181  vector unsigned char src_v1, src_vF;
182  vector signed short src_v, filter_v;
183  vector signed int val_v, val_s;
184  if ((((uintptr_t)src + srcPos) % 16) > 8) {
185  src_v1 = vec_ld(srcPos + 16, src);
186  }
187  src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
188 
189  src_v = // vec_unpackh sign-extends...
190  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
191  filter_v = vec_ld(i << 4, filter);
192  // the 4 above is 3 (filterSize == 8) + 1 (sizeof(short) == 2)
193 
194  val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
195  val_s = vec_sums(val_v, vzero);
196  vec_st(val_s, 0, tempo);
197  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
198  }
199  break;
200 
201  case 16:
202  for (i = 0; i < dstW; i++) {
203  register int srcPos = filterPos[i];
204 
205  vector unsigned char src_v0 = vec_ld(srcPos, src);
206  vector unsigned char src_v1 = vec_ld(srcPos + 16, src);
207  vector unsigned char src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
208 
209  vector signed short src_vA = // vec_unpackh sign-extends...
210  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
211  vector signed short src_vB = // vec_unpackh sign-extends...
212  (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
213 
214  vector signed short filter_v0 = vec_ld(i << 5, filter);
215  vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
216  // the 5 above are 4 (filterSize == 16) + 1 (sizeof(short) == 2)
217 
218  vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
219  vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
220 
221  vector signed int val_s = vec_sums(val_v, vzero);
222 
223  vec_st(val_s, 0, tempo);
224  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
225  }
226  break;
227 
228  default:
229  for (i = 0; i < dstW; i++) {
230  register int j;
231  register int srcPos = filterPos[i];
232 
233  vector signed int val_s, val_v = (vector signed int)vzero;
234  vector signed short filter_v0R = vec_ld(i * 2 * filterSize, filter);
235  vector unsigned char permF = vec_lvsl((i * 2 * filterSize), filter);
236 
237  vector unsigned char src_v0 = vec_ld(srcPos, src);
238  vector unsigned char permS = vec_lvsl(srcPos, src);
239 
240  for (j = 0; j < filterSize - 15; j += 16) {
241  vector unsigned char src_v1 = vec_ld(srcPos + j + 16, src);
242  vector unsigned char src_vF = vec_perm(src_v0, src_v1, permS);
243 
244  vector signed short src_vA = // vec_unpackh sign-extends...
245  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
246  vector signed short src_vB = // vec_unpackh sign-extends...
247  (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
248 
249  vector signed short filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
250  vector signed short filter_v2R = vec_ld((i * 2 * filterSize) + (j * 2) + 32, filter);
251  vector signed short filter_v0 = vec_perm(filter_v0R, filter_v1R, permF);
252  vector signed short filter_v1 = vec_perm(filter_v1R, filter_v2R, permF);
253 
254  vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
255  val_v = vec_msums(src_vB, filter_v1, val_acc);
256 
257  filter_v0R = filter_v2R;
258  src_v0 = src_v1;
259  }
260 
261  if (j < filterSize - 7) {
262  // loading src_v0 is useless, it's already done above
263  // vector unsigned char src_v0 = vec_ld(srcPos + j, src);
264  vector unsigned char src_v1, src_vF;
265  vector signed short src_v, filter_v1R, filter_v;
266  if ((((uintptr_t)src + srcPos) % 16) > 8) {
267  src_v1 = vec_ld(srcPos + j + 16, src);
268  }
269  src_vF = vec_perm(src_v0, src_v1, permS);
270 
271  src_v = // vec_unpackh sign-extends...
272  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
273  // loading filter_v0R is useless, it's already done above
274  // vector signed short filter_v0R = vec_ld((i * 2 * filterSize) + j, filter);
275  filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
276  filter_v = vec_perm(filter_v0R, filter_v1R, permF);
277 
278  val_v = vec_msums(src_v, filter_v, val_v);
279  }
280 
281  val_s = vec_sums(val_v, vzero);
282 
283  vec_st(val_s, 0, tempo);
284  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
285  }
286  }
287 }
288 #endif /* HAVE_ALTIVEC */
289 
290 av_cold void ff_sws_init_swscale_ppc(SwsContext *c)
291 {
292 #if HAVE_ALTIVEC
293  enum AVPixelFormat dstFormat = c->dstFormat;
294 
295  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
296  return;
297 
298  if (c->srcBpc == 8 && c->dstBpc <= 14) {
299  c->hyScale = c->hcScale = hScale_altivec_real;
300  }
301  if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat) &&
302  dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&
303  !c->alpPixBuf) {
304  c->yuv2planeX = yuv2planeX_altivec;
305  }
306 
307  /* The following list of supported dstFormat values should
308  * match what's found in the body of ff_yuv2packedX_altivec() */
309  if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->alpPixBuf) {
310  switch (c->dstFormat) {
311  case AV_PIX_FMT_ABGR:
312  c->yuv2packedX = ff_yuv2abgr_X_altivec;
313  break;
314  case AV_PIX_FMT_BGRA:
315  c->yuv2packedX = ff_yuv2bgra_X_altivec;
316  break;
317  case AV_PIX_FMT_ARGB:
318  c->yuv2packedX = ff_yuv2argb_X_altivec;
319  break;
320  case AV_PIX_FMT_RGBA:
321  c->yuv2packedX = ff_yuv2rgba_X_altivec;
322  break;
323  case AV_PIX_FMT_BGR24:
324  c->yuv2packedX = ff_yuv2bgr24_X_altivec;
325  break;
326  case AV_PIX_FMT_RGB24:
327  c->yuv2packedX = ff_yuv2rgb24_X_altivec;
328  break;
329  }
330  }
331 #endif /* HAVE_ALTIVEC */
332 }
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