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vp8dsp_altivec.c
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1 /*
2  * VP8 compatible video decoder
3  *
4  * Copyright (C) 2010 David Conrad
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 #include "libavutil/cpu.h"
25 #include "libavutil/mem.h"
26 #include "libavutil/ppc/cpu.h"
27 #include "libavutil/ppc/types_altivec.h"
28 #include "libavutil/ppc/util_altivec.h"
29 #include "libavcodec/vp8dsp.h"
30 #include "hpeldsp_altivec.h"
31 
32 #if HAVE_ALTIVEC
33 #define REPT4(...) { __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__ }
34 
35 // h subpel filter uses msum to multiply+add 4 pixel taps at once
36 static const vec_s8 h_subpel_filters_inner[7] =
37 {
38  REPT4( -6, 123, 12, -1),
39  REPT4(-11, 108, 36, -8),
40  REPT4( -9, 93, 50, -6),
41  REPT4(-16, 77, 77, -16),
42  REPT4( -6, 50, 93, -9),
43  REPT4( -8, 36, 108, -11),
44  REPT4( -1, 12, 123, -6),
45 };
46 
47 // for 6tap filters, these are the outer two taps
48 // The zeros mask off pixels 4-7 when filtering 0-3
49 // and vice-versa
50 static const vec_s8 h_subpel_filters_outer[3] =
51 {
52  REPT4(0, 0, 2, 1),
53  REPT4(0, 0, 3, 3),
54  REPT4(0, 0, 1, 2),
55 };
56 
57 #define LOAD_H_SUBPEL_FILTER(i) \
58  vec_s8 filter_inner = h_subpel_filters_inner[i]; \
59  vec_s8 filter_outerh = h_subpel_filters_outer[(i)>>1]; \
60  vec_s8 filter_outerl = vec_sld(filter_outerh, filter_outerh, 2)
61 
62 #define FILTER_H(dstv, off) \
63  a = vec_ld((off)-is6tap-1, src); \
64  b = vec_ld((off)-is6tap-1+15, src); \
65 \
66  pixh = vec_perm(a, b, permh##off); \
67  pixl = vec_perm(a, b, perml##off); \
68  filth = vec_msum(filter_inner, pixh, c64); \
69  filtl = vec_msum(filter_inner, pixl, c64); \
70 \
71  if (is6tap) { \
72  outer = vec_perm(a, b, perm_6tap##off); \
73  filth = vec_msum(filter_outerh, outer, filth); \
74  filtl = vec_msum(filter_outerl, outer, filtl); \
75  } \
76  if (w == 4) \
77  filtl = filth; /* discard pixels 4-7 */ \
78  dstv = vec_packs(filth, filtl); \
79  dstv = vec_sra(dstv, c7)
80 
81 static av_always_inline
82 void put_vp8_epel_h_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
83  uint8_t *src, ptrdiff_t src_stride,
84  int h, int mx, int w, int is6tap)
85 {
86  LOAD_H_SUBPEL_FILTER(mx-1);
87  vec_u8 align_vec0, align_vec8, permh0, permh8, filt;
88  vec_u8 perm_6tap0, perm_6tap8, perml0, perml8;
89  vec_u8 a, b, pixh, pixl, outer;
90  vec_s16 f16h, f16l;
91  vec_s32 filth, filtl;
92 
93  vec_u8 perm_inner6 = { 1,2,3,4, 2,3,4,5, 3,4,5,6, 4,5,6,7 };
94  vec_u8 perm_inner4 = { 0,1,2,3, 1,2,3,4, 2,3,4,5, 3,4,5,6 };
95  vec_u8 perm_inner = is6tap ? perm_inner6 : perm_inner4;
96  vec_u8 perm_outer = { 4,9, 0,5, 5,10, 1,6, 6,11, 2,7, 7,12, 3,8 };
97  vec_s32 c64 = vec_sl(vec_splat_s32(1), vec_splat_u32(6));
98  vec_u16 c7 = vec_splat_u16(7);
99 
100  align_vec0 = vec_lvsl( -is6tap-1, src);
101  align_vec8 = vec_lvsl(8-is6tap-1, src);
102 
103  permh0 = vec_perm(align_vec0, align_vec0, perm_inner);
104  permh8 = vec_perm(align_vec8, align_vec8, perm_inner);
105  perm_inner = vec_add(perm_inner, vec_splat_u8(4));
106  perml0 = vec_perm(align_vec0, align_vec0, perm_inner);
107  perml8 = vec_perm(align_vec8, align_vec8, perm_inner);
108  perm_6tap0 = vec_perm(align_vec0, align_vec0, perm_outer);
109  perm_6tap8 = vec_perm(align_vec8, align_vec8, perm_outer);
110 
111  while (h --> 0) {
112  FILTER_H(f16h, 0);
113 
114  if (w == 16) {
115  FILTER_H(f16l, 8);
116  filt = vec_packsu(f16h, f16l);
117  vec_st(filt, 0, dst);
118  } else {
119  filt = vec_packsu(f16h, f16h);
120  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
121  if (w == 8)
122  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
123  }
124  src += src_stride;
125  dst += dst_stride;
126  }
127 }
128 
129 // v subpel filter does a simple vertical multiply + add
130 static const vec_u8 v_subpel_filters[7] =
131 {
132  { 0, 6, 123, 12, 1, 0 },
133  { 2, 11, 108, 36, 8, 1 },
134  { 0, 9, 93, 50, 6, 0 },
135  { 3, 16, 77, 77, 16, 3 },
136  { 0, 6, 50, 93, 9, 0 },
137  { 1, 8, 36, 108, 11, 2 },
138  { 0, 1, 12, 123, 6, 0 },
139 };
140 
141 #define LOAD_V_SUBPEL_FILTER(i) \
142  vec_u8 subpel_filter = v_subpel_filters[i]; \
143  vec_u8 f0 = vec_splat(subpel_filter, 0); \
144  vec_u8 f1 = vec_splat(subpel_filter, 1); \
145  vec_u8 f2 = vec_splat(subpel_filter, 2); \
146  vec_u8 f3 = vec_splat(subpel_filter, 3); \
147  vec_u8 f4 = vec_splat(subpel_filter, 4); \
148  vec_u8 f5 = vec_splat(subpel_filter, 5)
149 
150 #define FILTER_V(dstv, vec_mul) \
151  s1f = (vec_s16)vec_mul(s1, f1); \
152  s2f = (vec_s16)vec_mul(s2, f2); \
153  s3f = (vec_s16)vec_mul(s3, f3); \
154  s4f = (vec_s16)vec_mul(s4, f4); \
155  s2f = vec_subs(s2f, s1f); \
156  s3f = vec_subs(s3f, s4f); \
157  if (is6tap) { \
158  s0f = (vec_s16)vec_mul(s0, f0); \
159  s5f = (vec_s16)vec_mul(s5, f5); \
160  s2f = vec_adds(s2f, s0f); \
161  s3f = vec_adds(s3f, s5f); \
162  } \
163  dstv = vec_adds(s2f, s3f); \
164  dstv = vec_adds(dstv, c64); \
165  dstv = vec_sra(dstv, c7)
166 
167 static av_always_inline
168 void put_vp8_epel_v_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
169  uint8_t *src, ptrdiff_t src_stride,
170  int h, int my, int w, int is6tap)
171 {
172  LOAD_V_SUBPEL_FILTER(my-1);
173  vec_u8 s0, s1, s2, s3, s4, s5, filt, align_vech, perm_vec, align_vecl;
174  vec_s16 s0f, s1f, s2f, s3f, s4f, s5f, f16h, f16l;
175  vec_s16 c64 = vec_sl(vec_splat_s16(1), vec_splat_u16(6));
176  vec_u16 c7 = vec_splat_u16(7);
177 
178  // we want pixels 0-7 to be in the even positions and 8-15 in the odd,
179  // so combine this permute with the alignment permute vector
180  align_vech = vec_lvsl(0, src);
181  align_vecl = vec_sld(align_vech, align_vech, 8);
182  if (w ==16)
183  perm_vec = vec_mergeh(align_vech, align_vecl);
184  else
185  perm_vec = vec_mergeh(align_vech, align_vech);
186 
187  if (is6tap)
188  s0 = load_with_perm_vec(-2*src_stride, src, perm_vec);
189  s1 = load_with_perm_vec(-1*src_stride, src, perm_vec);
190  s2 = load_with_perm_vec( 0*src_stride, src, perm_vec);
191  s3 = load_with_perm_vec( 1*src_stride, src, perm_vec);
192  if (is6tap)
193  s4 = load_with_perm_vec( 2*src_stride, src, perm_vec);
194 
195  src += (2+is6tap)*src_stride;
196 
197  while (h --> 0) {
198  if (is6tap)
199  s5 = load_with_perm_vec(0, src, perm_vec);
200  else
201  s4 = load_with_perm_vec(0, src, perm_vec);
202 
203  FILTER_V(f16h, vec_mule);
204 
205  if (w == 16) {
206  FILTER_V(f16l, vec_mulo);
207  filt = vec_packsu(f16h, f16l);
208  vec_st(filt, 0, dst);
209  } else {
210  filt = vec_packsu(f16h, f16h);
211  if (w == 4)
212  filt = (vec_u8)vec_splat((vec_u32)filt, 0);
213  else
214  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
215  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
216  }
217 
218  if (is6tap)
219  s0 = s1;
220  s1 = s2;
221  s2 = s3;
222  s3 = s4;
223  if (is6tap)
224  s4 = s5;
225 
226  dst += dst_stride;
227  src += src_stride;
228  }
229 }
230 
231 #define EPEL_FUNCS(WIDTH, TAPS) \
232 static av_noinline \
233 void put_vp8_epel ## WIDTH ## _h ## TAPS ## _altivec(uint8_t *dst, ptrdiff_t dst_stride, uint8_t *src, ptrdiff_t src_stride, int h, int mx, int my) \
234 { \
235  put_vp8_epel_h_altivec_core(dst, dst_stride, src, src_stride, h, mx, WIDTH, TAPS == 6); \
236 } \
237 \
238 static av_noinline \
239 void put_vp8_epel ## WIDTH ## _v ## TAPS ## _altivec(uint8_t *dst, ptrdiff_t dst_stride, uint8_t *src, ptrdiff_t src_stride, int h, int mx, int my) \
240 { \
241  put_vp8_epel_v_altivec_core(dst, dst_stride, src, src_stride, h, my, WIDTH, TAPS == 6); \
242 }
243 
244 #define EPEL_HV(WIDTH, HTAPS, VTAPS) \
245 static void put_vp8_epel ## WIDTH ## _h ## HTAPS ## v ## VTAPS ## _altivec(uint8_t *dst, ptrdiff_t dstride, uint8_t *src, ptrdiff_t sstride, int h, int mx, int my) \
246 { \
247  DECLARE_ALIGNED(16, uint8_t, tmp)[(2*WIDTH+5)*16]; \
248  if (VTAPS == 6) { \
249  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-2*sstride, sstride, h+5, mx, my); \
250  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, dstride, tmp+2*16, 16, h, mx, my); \
251  } else { \
252  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-sstride, sstride, h+4, mx, my); \
253  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, dstride, tmp+16, 16, h, mx, my); \
254  } \
255 }
256 
257 EPEL_FUNCS(16,6)
258 EPEL_FUNCS(8, 6)
259 EPEL_FUNCS(8, 4)
260 EPEL_FUNCS(4, 6)
261 EPEL_FUNCS(4, 4)
262 
263 EPEL_HV(16, 6,6)
264 EPEL_HV(8, 6,6)
265 EPEL_HV(8, 4,6)
266 EPEL_HV(8, 6,4)
267 EPEL_HV(8, 4,4)
268 EPEL_HV(4, 6,6)
269 EPEL_HV(4, 4,6)
270 EPEL_HV(4, 6,4)
271 EPEL_HV(4, 4,4)
272 
273 static void put_vp8_pixels16_altivec(uint8_t *dst, ptrdiff_t dstride, uint8_t *src, ptrdiff_t sstride, int h, int mx, int my)
274 {
275  register vector unsigned char pixelsv1, pixelsv2;
276  register vector unsigned char pixelsv1B, pixelsv2B;
277  register vector unsigned char pixelsv1C, pixelsv2C;
278  register vector unsigned char pixelsv1D, pixelsv2D;
279 
280  register vector unsigned char perm = vec_lvsl(0, src);
281  int i;
282  register ptrdiff_t dstride2 = dstride << 1, sstride2 = sstride << 1;
283  register ptrdiff_t dstride3 = dstride2 + dstride, sstride3 = sstride + sstride2;
284  register ptrdiff_t dstride4 = dstride << 2, sstride4 = sstride << 2;
285 
286 // hand-unrolling the loop by 4 gains about 15%
287 // mininum execution time goes from 74 to 60 cycles
288 // it's faster than -funroll-loops, but using
289 // -funroll-loops w/ this is bad - 74 cycles again.
290 // all this is on a 7450, tuning for the 7450
291  for (i = 0; i < h; i += 4) {
292  pixelsv1 = vec_ld( 0, src);
293  pixelsv2 = vec_ld(15, src);
294  pixelsv1B = vec_ld(sstride, src);
295  pixelsv2B = vec_ld(15 + sstride, src);
296  pixelsv1C = vec_ld(sstride2, src);
297  pixelsv2C = vec_ld(15 + sstride2, src);
298  pixelsv1D = vec_ld(sstride3, src);
299  pixelsv2D = vec_ld(15 + sstride3, src);
300  vec_st(vec_perm(pixelsv1, pixelsv2, perm),
301  0, (unsigned char*)dst);
302  vec_st(vec_perm(pixelsv1B, pixelsv2B, perm),
303  dstride, (unsigned char*)dst);
304  vec_st(vec_perm(pixelsv1C, pixelsv2C, perm),
305  dstride2, (unsigned char*)dst);
306  vec_st(vec_perm(pixelsv1D, pixelsv2D, perm),
307  dstride3, (unsigned char*)dst);
308  src += sstride4;
309  dst += dstride4;
310  }
311 }
312 
313 #endif /* HAVE_ALTIVEC */
314 
315 
316 av_cold void ff_vp78dsp_init_ppc(VP8DSPContext *c)
317 {
318 #if HAVE_ALTIVEC
319  if (!PPC_ALTIVEC(av_get_cpu_flags()))
320  return;
321 
322  c->put_vp8_epel_pixels_tab[0][0][0] = put_vp8_pixels16_altivec;
323  c->put_vp8_epel_pixels_tab[0][0][2] = put_vp8_epel16_h6_altivec;
324  c->put_vp8_epel_pixels_tab[0][2][0] = put_vp8_epel16_v6_altivec;
325  c->put_vp8_epel_pixels_tab[0][2][2] = put_vp8_epel16_h6v6_altivec;
326 
327  c->put_vp8_epel_pixels_tab[1][0][2] = put_vp8_epel8_h6_altivec;
328  c->put_vp8_epel_pixels_tab[1][2][0] = put_vp8_epel8_v6_altivec;
329  c->put_vp8_epel_pixels_tab[1][0][1] = put_vp8_epel8_h4_altivec;
330  c->put_vp8_epel_pixels_tab[1][1][0] = put_vp8_epel8_v4_altivec;
331 
332  c->put_vp8_epel_pixels_tab[1][2][2] = put_vp8_epel8_h6v6_altivec;
333  c->put_vp8_epel_pixels_tab[1][1][1] = put_vp8_epel8_h4v4_altivec;
334  c->put_vp8_epel_pixels_tab[1][1][2] = put_vp8_epel8_h6v4_altivec;
335  c->put_vp8_epel_pixels_tab[1][2][1] = put_vp8_epel8_h4v6_altivec;
336 
337  c->put_vp8_epel_pixels_tab[2][0][2] = put_vp8_epel4_h6_altivec;
338  c->put_vp8_epel_pixels_tab[2][2][0] = put_vp8_epel4_v6_altivec;
339  c->put_vp8_epel_pixels_tab[2][0][1] = put_vp8_epel4_h4_altivec;
340  c->put_vp8_epel_pixels_tab[2][1][0] = put_vp8_epel4_v4_altivec;
341 
342  c->put_vp8_epel_pixels_tab[2][2][2] = put_vp8_epel4_h6v6_altivec;
343  c->put_vp8_epel_pixels_tab[2][1][1] = put_vp8_epel4_h4v4_altivec;
344  c->put_vp8_epel_pixels_tab[2][1][2] = put_vp8_epel4_h6v4_altivec;
345  c->put_vp8_epel_pixels_tab[2][2][1] = put_vp8_epel4_h4v6_altivec;
346 #endif /* HAVE_ALTIVEC */
347 }
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