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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"
29 #include "libavutil/attributes.h"
30 #include "libavutil/cpu.h"
31 #include "yuv2rgb_altivec.h"
33 
34 #if HAVE_ALTIVEC
35 #define vzero vec_splat_s32(0)
36 
37 #if HAVE_BIGENDIAN
38 #define GET_LS(a,b,c,s) {\
39  vector signed short l2 = vec_ld(((b) << 1) + 16, s);\
40  ls = vec_perm(a, l2, c);\
41  a = l2;\
42  }
43 #else
44 #define GET_LS(a,b,c,s) {\
45  ls = a;\
46  a = vec_vsx_ld(((b) << 1) + 16, s);\
47  }
48 #endif
49 
50 #define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do {\
51  vector signed short ls;\
52  GET_LS(l1, x, perm, src);\
53  vector signed int i1 = vec_mule(filter, ls);\
54  vector signed int i2 = vec_mulo(filter, ls);\
55  vector signed int vf1, vf2;\
56  vf1 = vec_mergeh(i1, i2);\
57  vf2 = vec_mergel(i1, i2);\
58  d1 = vec_add(d1, vf1);\
59  d2 = vec_add(d2, vf2);\
60  } while (0)
61 
62 #if HAVE_BIGENDIAN
63 #define LOAD_FILTER(vf,f) {\
64  vector unsigned char perm0 = vec_lvsl(joffset, f);\
65  vf = vec_ld(joffset, f);\
66  vf = vec_perm(vf, vf, perm0);\
67 }
68 #define LOAD_L1(ll1,s,p){\
69  p = vec_lvsl(xoffset, s);\
70  ll1 = vec_ld(xoffset, s);\
71 }
72 #else
73 #define LOAD_FILTER(vf,f) {\
74  vf = vec_vsx_ld(joffset, f);\
75 }
76 #define LOAD_L1(ll1,s,p){\
77  ll1 = vec_vsx_ld(xoffset, s);\
78 }
79 #endif
80 
81 static void yuv2planeX_16_altivec(const int16_t *filter, int filterSize,
82  const int16_t **src, uint8_t *dest,
83  const uint8_t *dither, int offset, int x)
84 {
85  register int i, j;
86  LOCAL_ALIGNED(16, int, val, [16]);
87  vector signed int vo1, vo2, vo3, vo4;
88  vector unsigned short vs1, vs2;
89  vector unsigned char vf;
90  vector unsigned int altivec_vectorShiftInt19 =
91  vec_add(vec_splat_u32(10), vec_splat_u32(9));
92 
93  for (i = 0; i < 16; i++)
94  val[i] = dither[(x + i + offset) & 7] << 12;
95 
96  vo1 = vec_ld(0, val);
97  vo2 = vec_ld(16, val);
98  vo3 = vec_ld(32, val);
99  vo4 = vec_ld(48, val);
100 
101  for (j = 0; j < filterSize; j++) {
102  unsigned int joffset=j<<1;
103  unsigned int xoffset=x<<1;
104  vector unsigned char perm;
105  vector signed short l1,vLumFilter;
106  LOAD_FILTER(vLumFilter,filter);
107  vLumFilter = vec_splat(vLumFilter, 0);
108  LOAD_L1(l1,src[j],perm);
109  yuv2planeX_8(vo1, vo2, l1, src[j], x, perm, vLumFilter);
110  yuv2planeX_8(vo3, vo4, l1, src[j], x + 8, perm, vLumFilter);
111  }
112 
113  vo1 = vec_sra(vo1, altivec_vectorShiftInt19);
114  vo2 = vec_sra(vo2, altivec_vectorShiftInt19);
115  vo3 = vec_sra(vo3, altivec_vectorShiftInt19);
116  vo4 = vec_sra(vo4, altivec_vectorShiftInt19);
117  vs1 = vec_packsu(vo1, vo2);
118  vs2 = vec_packsu(vo3, vo4);
119  vf = vec_packsu(vs1, vs2);
120  VEC_ST(vf, 0, dest);
121 }
122 
123 
124 static inline void yuv2planeX_u(const int16_t *filter, int filterSize,
125  const int16_t **src, uint8_t *dest, int dstW,
126  const uint8_t *dither, int offset, int x)
127 {
128  int i, j;
129 
130  for (i = x; i < dstW; i++) {
131  int t = dither[(i + offset) & 7] << 12;
132  for (j = 0; j < filterSize; j++)
133  t += src[j][i] * filter[j];
134  dest[i] = av_clip_uint8(t >> 19);
135  }
136 }
137 
138 static void yuv2planeX_altivec(const int16_t *filter, int filterSize,
139  const int16_t **src, uint8_t *dest, int dstW,
140  const uint8_t *dither, int offset)
141 {
142  int dst_u = -(uintptr_t)dest & 15;
143  int i;
144 
145  yuv2planeX_u(filter, filterSize, src, dest, dst_u, dither, offset, 0);
146 
147  for (i = dst_u; i < dstW - 15; i += 16)
148  yuv2planeX_16_altivec(filter, filterSize, src, dest + i, dither,
149  offset, i);
150 
151  yuv2planeX_u(filter, filterSize, src, dest, dstW, dither, offset, i);
152 }
153 
154 #if HAVE_BIGENDIAN
155 // The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
156 
157 // The neat trick: We only care for half the elements,
158 // high or low depending on (i<<3)%16 (it's 0 or 8 here),
159 // and we're going to use vec_mule, so we choose
160 // carefully how to "unpack" the elements into the even slots.
161 #define GET_VF4(a, vf, f) {\
162  vf = vec_ld(a<< 3, f);\
163  if ((a << 3) % 16)\
164  vf = vec_mergel(vf, (vector signed short)vzero);\
165  else\
166  vf = vec_mergeh(vf, (vector signed short)vzero);\
167 }
168 #define FIRST_LOAD(sv, pos, s, per) {\
169  sv = vec_ld(pos, s);\
170  per = vec_lvsl(pos, s);\
171 }
172 #define UPDATE_PTR(s0, d0, s1, d1) {\
173  d0 = s0;\
174  d1 = s1;\
175 }
176 #define LOAD_SRCV(pos, a, s, per, v0, v1, vf) {\
177  v1 = vec_ld(pos + a + 16, s);\
178  vf = vec_perm(v0, v1, per);\
179 }
180 #define LOAD_SRCV8(pos, a, s, per, v0, v1, vf) {\
181  if ((((uintptr_t)s + pos) % 16) > 8) {\
182  v1 = vec_ld(pos + a + 16, s);\
183  }\
184  vf = vec_perm(v0, src_v1, per);\
185 }
186 #define GET_VFD(a, b, f, vf0, vf1, per, vf, off) {\
187  vf1 = vec_ld((a * 2 * filterSize) + (b * 2) + 16 + off, f);\
188  vf = vec_perm(vf0, vf1, per);\
189 }
190 #else /* else of #if HAVE_BIGENDIAN */
191 #define GET_VF4(a, vf, f) {\
192  vf = (vector signed short)vec_vsx_ld(a << 3, f);\
193  vf = vec_mergeh(vf, (vector signed short)vzero);\
194 }
195 #define FIRST_LOAD(sv, pos, s, per) {}
196 #define UPDATE_PTR(s0, d0, s1, d1) {}
197 #define LOAD_SRCV(pos, a, s, per, v0, v1, vf) {\
198  vf = vec_vsx_ld(pos + a, s);\
199 }
200 #define LOAD_SRCV8(pos, a, s, per, v0, v1, vf) LOAD_SRCV(pos, a, s, per, v0, v1, vf)
201 #define GET_VFD(a, b, f, vf0, vf1, per, vf, off) {\
202  vf = vec_vsx_ld((a * 2 * filterSize) + (b * 2) + off, f);\
203 }
204 #endif /* end of #if HAVE_BIGENDIAN */
205 
206 static void hScale_altivec_real(SwsContext *c, int16_t *dst, int dstW,
207  const uint8_t *src, const int16_t *filter,
208  const int32_t *filterPos, int filterSize)
209 {
210  register int i;
211  LOCAL_ALIGNED(16, int, tempo, [4]);
212 
213  if (filterSize % 4) {
214  for (i = 0; i < dstW; i++) {
215  register int j;
216  register int srcPos = filterPos[i];
217  register int val = 0;
218  for (j = 0; j < filterSize; j++)
219  val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
220  dst[i] = FFMIN(val >> 7, (1 << 15) - 1);
221  }
222  } else
223  switch (filterSize) {
224  case 4:
225  for (i = 0; i < dstW; i++) {
226  register int srcPos = filterPos[i];
227 
228  vector unsigned char src_vF = unaligned_load(srcPos, src);
229  vector signed short src_v, filter_v;
230  vector signed int val_vEven, val_s;
231  src_v = // vec_unpackh sign-extends...
232  (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
233  // now put our elements in the even slots
234  src_v = vec_mergeh(src_v, (vector signed short)vzero);
235  GET_VF4(i, filter_v, filter);
236  val_vEven = vec_mule(src_v, filter_v);
237  val_s = vec_sums(val_vEven, vzero);
238  vec_st(val_s, 0, tempo);
239  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
240  }
241  break;
242  case 8:
243  for (i = 0; i < dstW; i++) {
244  register int srcPos = filterPos[i];
245  vector unsigned char src_vF, src_v0, src_v1;
246  vector unsigned char permS;
247  vector signed short src_v, filter_v;
248  vector signed int val_v, val_s;
249  FIRST_LOAD(src_v0, srcPos, src, permS);
250  LOAD_SRCV8(srcPos, 0, src, permS, src_v0, src_v1, src_vF);
251  src_v = // vec_unpackh sign-extends...
252  (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
253  filter_v = vec_ld(i << 4, filter);
254  val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
255  val_s = vec_sums(val_v, vzero);
256  vec_st(val_s, 0, tempo);
257  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
258  }
259  break;
260 
261  case 16:
262  for (i = 0; i < dstW; i++) {
263  register int srcPos = filterPos[i];
264 
265  vector unsigned char src_vF = unaligned_load(srcPos, src);
266  vector signed short src_vA = // vec_unpackh sign-extends...
267  (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
268  vector signed short src_vB = // vec_unpackh sign-extends...
269  (vector signed short)(VEC_MERGEL((vector unsigned char)vzero, src_vF));
270  vector signed short filter_v0 = vec_ld(i << 5, filter);
271  vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
272 
273  vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
274  vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
275 
276  vector signed int val_s = vec_sums(val_v, vzero);
277 
278  VEC_ST(val_s, 0, tempo);
279  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
280  }
281  break;
282 
283  default:
284  for (i = 0; i < dstW; i++) {
285  register int j, offset = i * 2 * filterSize;
286  register int srcPos = filterPos[i];
287 
288  vector signed int val_s, val_v = (vector signed int)vzero;
289  vector signed short filter_v0R;
290  vector unsigned char permF, src_v0, permS;
291  FIRST_LOAD(filter_v0R, offset, filter, permF);
292  FIRST_LOAD(src_v0, srcPos, src, permS);
293 
294  for (j = 0; j < filterSize - 15; j += 16) {
295  vector unsigned char src_v1, src_vF;
296  vector signed short filter_v1R, filter_v2R, filter_v0, filter_v1;
297  LOAD_SRCV(srcPos, j, src, permS, src_v0, src_v1, src_vF);
298  vector signed short src_vA = // vec_unpackh sign-extends...
299  (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
300  vector signed short src_vB = // vec_unpackh sign-extends...
301  (vector signed short)(VEC_MERGEL((vector unsigned char)vzero, src_vF));
302  GET_VFD(i, j, filter, filter_v0R, filter_v1R, permF, filter_v0, 0);
303  GET_VFD(i, j, filter, filter_v1R, filter_v2R, permF, filter_v1, 16);
304 
305  vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
306  val_v = vec_msums(src_vB, filter_v1, val_acc);
307  UPDATE_PTR(filter_v2R, filter_v0R, src_v1, src_v0);
308  }
309 
310  if (j < filterSize - 7) {
311  // loading src_v0 is useless, it's already done above
312  vector unsigned char src_v1, src_vF;
313  vector signed short src_v, filter_v1R, filter_v;
314  LOAD_SRCV8(srcPos, j, src, permS, src_v0, src_v1, src_vF);
315  src_v = // vec_unpackh sign-extends...
316  (vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
317  GET_VFD(i, j, filter, filter_v0R, filter_v1R, permF, filter_v, 0);
318  val_v = vec_msums(src_v, filter_v, val_v);
319  }
320  val_s = vec_sums(val_v, vzero);
321 
322  VEC_ST(val_s, 0, tempo);
323  dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
324  }
325  }
326 }
327 #endif /* HAVE_ALTIVEC */
328 
330 {
331 #if HAVE_ALTIVEC
332  enum AVPixelFormat dstFormat = c->dstFormat;
333 
335  return;
336 
337  if (c->srcBpc == 8 && c->dstBpc <= 14) {
338  c->hyScale = c->hcScale = hScale_altivec_real;
339  }
340  if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat) &&
341  dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&
342  !c->alpPixBuf) {
343  c->yuv2planeX = yuv2planeX_altivec;
344  }
345 
346  /* The following list of supported dstFormat values should
347  * match what's found in the body of ff_yuv2packedX_altivec() */
348  if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->alpPixBuf) {
349  switch (c->dstFormat) {
350  case AV_PIX_FMT_ABGR:
351  c->yuv2packedX = ff_yuv2abgr_X_altivec;
352  break;
353  case AV_PIX_FMT_BGRA:
354  c->yuv2packedX = ff_yuv2bgra_X_altivec;
355  break;
356  case AV_PIX_FMT_ARGB:
357  c->yuv2packedX = ff_yuv2argb_X_altivec;
358  break;
359  case AV_PIX_FMT_RGBA:
360  c->yuv2packedX = ff_yuv2rgba_X_altivec;
361  break;
362  case AV_PIX_FMT_BGR24:
363  c->yuv2packedX = ff_yuv2bgr24_X_altivec;
364  break;
365  case AV_PIX_FMT_RGB24:
366  c->yuv2packedX = ff_yuv2rgb24_X_altivec;
367  break;
368  }
369  }
370 #endif /* HAVE_ALTIVEC */
371 }