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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/types_altivec.h"
27 #include "libavutil/ppc/util_altivec.h"
28 #include "libavcodec/vp8dsp.h"
29 #include "dsputil_altivec.h"
30 
31 #if HAVE_ALTIVEC
32 #define REPT4(...) { __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__ }
33 
34 // h subpel filter uses msum to multiply+add 4 pixel taps at once
35 static const vec_s8 h_subpel_filters_inner[7] =
36 {
37  REPT4( -6, 123, 12, -1),
38  REPT4(-11, 108, 36, -8),
39  REPT4( -9, 93, 50, -6),
40  REPT4(-16, 77, 77, -16),
41  REPT4( -6, 50, 93, -9),
42  REPT4( -8, 36, 108, -11),
43  REPT4( -1, 12, 123, -6),
44 };
45 
46 // for 6tap filters, these are the outer two taps
47 // The zeros mask off pixels 4-7 when filtering 0-3
48 // and vice-versa
49 static const vec_s8 h_subpel_filters_outer[3] =
50 {
51  REPT4(0, 0, 2, 1),
52  REPT4(0, 0, 3, 3),
53  REPT4(0, 0, 1, 2),
54 };
55 
56 #define LOAD_H_SUBPEL_FILTER(i) \
57  vec_s8 filter_inner = h_subpel_filters_inner[i]; \
58  vec_s8 filter_outerh = h_subpel_filters_outer[(i)>>1]; \
59  vec_s8 filter_outerl = vec_sld(filter_outerh, filter_outerh, 2)
60 
61 #define FILTER_H(dstv, off) \
62  a = vec_ld((off)-is6tap-1, src); \
63  b = vec_ld((off)-is6tap-1+15, src); \
64 \
65  pixh = vec_perm(a, b, permh##off); \
66  pixl = vec_perm(a, b, perml##off); \
67  filth = vec_msum(filter_inner, pixh, c64); \
68  filtl = vec_msum(filter_inner, pixl, c64); \
69 \
70  if (is6tap) { \
71  outer = vec_perm(a, b, perm_6tap##off); \
72  filth = vec_msum(filter_outerh, outer, filth); \
73  filtl = vec_msum(filter_outerl, outer, filtl); \
74  } \
75  if (w == 4) \
76  filtl = filth; /* discard pixels 4-7 */ \
77  dstv = vec_packs(filth, filtl); \
78  dstv = vec_sra(dstv, c7)
79 
80 static av_always_inline
81 void put_vp8_epel_h_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
82  uint8_t *src, ptrdiff_t src_stride,
83  int h, int mx, int w, int is6tap)
84 {
85  LOAD_H_SUBPEL_FILTER(mx-1);
86  vec_u8 align_vec0, align_vec8, permh0, permh8, filt;
87  vec_u8 perm_6tap0, perm_6tap8, perml0, perml8;
88  vec_u8 a, b, pixh, pixl, outer;
89  vec_s16 f16h, f16l;
90  vec_s32 filth, filtl;
91 
92  vec_u8 perm_inner6 = { 1,2,3,4, 2,3,4,5, 3,4,5,6, 4,5,6,7 };
93  vec_u8 perm_inner4 = { 0,1,2,3, 1,2,3,4, 2,3,4,5, 3,4,5,6 };
94  vec_u8 perm_inner = is6tap ? perm_inner6 : perm_inner4;
95  vec_u8 perm_outer = { 4,9, 0,5, 5,10, 1,6, 6,11, 2,7, 7,12, 3,8 };
96  vec_s32 c64 = vec_sl(vec_splat_s32(1), vec_splat_u32(6));
97  vec_u16 c7 = vec_splat_u16(7);
98 
99  align_vec0 = vec_lvsl( -is6tap-1, src);
100  align_vec8 = vec_lvsl(8-is6tap-1, src);
101 
102  permh0 = vec_perm(align_vec0, align_vec0, perm_inner);
103  permh8 = vec_perm(align_vec8, align_vec8, perm_inner);
104  perm_inner = vec_add(perm_inner, vec_splat_u8(4));
105  perml0 = vec_perm(align_vec0, align_vec0, perm_inner);
106  perml8 = vec_perm(align_vec8, align_vec8, perm_inner);
107  perm_6tap0 = vec_perm(align_vec0, align_vec0, perm_outer);
108  perm_6tap8 = vec_perm(align_vec8, align_vec8, perm_outer);
109 
110  while (h --> 0) {
111  FILTER_H(f16h, 0);
112 
113  if (w == 16) {
114  FILTER_H(f16l, 8);
115  filt = vec_packsu(f16h, f16l);
116  vec_st(filt, 0, dst);
117  } else {
118  filt = vec_packsu(f16h, f16h);
119  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
120  if (w == 8)
121  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
122  }
123  src += src_stride;
124  dst += dst_stride;
125  }
126 }
127 
128 // v subpel filter does a simple vertical multiply + add
129 static const vec_u8 v_subpel_filters[7] =
130 {
131  { 0, 6, 123, 12, 1, 0 },
132  { 2, 11, 108, 36, 8, 1 },
133  { 0, 9, 93, 50, 6, 0 },
134  { 3, 16, 77, 77, 16, 3 },
135  { 0, 6, 50, 93, 9, 0 },
136  { 1, 8, 36, 108, 11, 2 },
137  { 0, 1, 12, 123, 6, 0 },
138 };
139 
140 #define LOAD_V_SUBPEL_FILTER(i) \
141  vec_u8 subpel_filter = v_subpel_filters[i]; \
142  vec_u8 f0 = vec_splat(subpel_filter, 0); \
143  vec_u8 f1 = vec_splat(subpel_filter, 1); \
144  vec_u8 f2 = vec_splat(subpel_filter, 2); \
145  vec_u8 f3 = vec_splat(subpel_filter, 3); \
146  vec_u8 f4 = vec_splat(subpel_filter, 4); \
147  vec_u8 f5 = vec_splat(subpel_filter, 5)
148 
149 #define FILTER_V(dstv, vec_mul) \
150  s1f = (vec_s16)vec_mul(s1, f1); \
151  s2f = (vec_s16)vec_mul(s2, f2); \
152  s3f = (vec_s16)vec_mul(s3, f3); \
153  s4f = (vec_s16)vec_mul(s4, f4); \
154  s2f = vec_subs(s2f, s1f); \
155  s3f = vec_subs(s3f, s4f); \
156  if (is6tap) { \
157  s0f = (vec_s16)vec_mul(s0, f0); \
158  s5f = (vec_s16)vec_mul(s5, f5); \
159  s2f = vec_adds(s2f, s0f); \
160  s3f = vec_adds(s3f, s5f); \
161  } \
162  dstv = vec_adds(s2f, s3f); \
163  dstv = vec_adds(dstv, c64); \
164  dstv = vec_sra(dstv, c7)
165 
166 static av_always_inline
167 void put_vp8_epel_v_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
168  uint8_t *src, ptrdiff_t src_stride,
169  int h, int my, int w, int is6tap)
170 {
171  LOAD_V_SUBPEL_FILTER(my-1);
172  vec_u8 s0, s1, s2, s3, s4, s5, filt, align_vech, perm_vec, align_vecl;
173  vec_s16 s0f, s1f, s2f, s3f, s4f, s5f, f16h, f16l;
174  vec_s16 c64 = vec_sl(vec_splat_s16(1), vec_splat_u16(6));
175  vec_u16 c7 = vec_splat_u16(7);
176 
177  // we want pixels 0-7 to be in the even positions and 8-15 in the odd,
178  // so combine this permute with the alignment permute vector
179  align_vech = vec_lvsl(0, src);
180  align_vecl = vec_sld(align_vech, align_vech, 8);
181  if (w ==16)
182  perm_vec = vec_mergeh(align_vech, align_vecl);
183  else
184  perm_vec = vec_mergeh(align_vech, align_vech);
185 
186  if (is6tap)
187  s0 = load_with_perm_vec(-2*src_stride, src, perm_vec);
188  s1 = load_with_perm_vec(-1*src_stride, src, perm_vec);
189  s2 = load_with_perm_vec( 0*src_stride, src, perm_vec);
190  s3 = load_with_perm_vec( 1*src_stride, src, perm_vec);
191  if (is6tap)
192  s4 = load_with_perm_vec( 2*src_stride, src, perm_vec);
193 
194  src += (2+is6tap)*src_stride;
195 
196  while (h --> 0) {
197  if (is6tap)
198  s5 = load_with_perm_vec(0, src, perm_vec);
199  else
200  s4 = load_with_perm_vec(0, src, perm_vec);
201 
202  FILTER_V(f16h, vec_mule);
203 
204  if (w == 16) {
205  FILTER_V(f16l, vec_mulo);
206  filt = vec_packsu(f16h, f16l);
207  vec_st(filt, 0, dst);
208  } else {
209  filt = vec_packsu(f16h, f16h);
210  if (w == 4)
211  filt = (vec_u8)vec_splat((vec_u32)filt, 0);
212  else
213  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
214  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
215  }
216 
217  if (is6tap)
218  s0 = s1;
219  s1 = s2;
220  s2 = s3;
221  s3 = s4;
222  if (is6tap)
223  s4 = s5;
224 
225  dst += dst_stride;
226  src += src_stride;
227  }
228 }
229 
230 #define EPEL_FUNCS(WIDTH, TAPS) \
231 static av_noinline \
232 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) \
233 { \
234  put_vp8_epel_h_altivec_core(dst, dst_stride, src, src_stride, h, mx, WIDTH, TAPS == 6); \
235 } \
236 \
237 static av_noinline \
238 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) \
239 { \
240  put_vp8_epel_v_altivec_core(dst, dst_stride, src, src_stride, h, my, WIDTH, TAPS == 6); \
241 }
242 
243 #define EPEL_HV(WIDTH, HTAPS, VTAPS) \
244 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) \
245 { \
246  DECLARE_ALIGNED(16, uint8_t, tmp)[(2*WIDTH+5)*16]; \
247  if (VTAPS == 6) { \
248  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-2*sstride, sstride, h+5, mx, my); \
249  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, dstride, tmp+2*16, 16, h, mx, my); \
250  } else { \
251  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-sstride, sstride, h+4, mx, my); \
252  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, dstride, tmp+16, 16, h, mx, my); \
253  } \
254 }
255 
256 EPEL_FUNCS(16,6)
257 EPEL_FUNCS(8, 6)
258 EPEL_FUNCS(8, 4)
259 EPEL_FUNCS(4, 6)
260 EPEL_FUNCS(4, 4)
261 
262 EPEL_HV(16, 6,6)
263 EPEL_HV(8, 6,6)
264 EPEL_HV(8, 4,6)
265 EPEL_HV(8, 6,4)
266 EPEL_HV(8, 4,4)
267 EPEL_HV(4, 6,6)
268 EPEL_HV(4, 4,6)
269 EPEL_HV(4, 6,4)
270 EPEL_HV(4, 4,4)
271 
272 static void put_vp8_pixels16_altivec(uint8_t *dst, ptrdiff_t dstride, uint8_t *src, ptrdiff_t sstride, int h, int mx, int my)
273 {
274  register vector unsigned char pixelsv1, pixelsv2;
275  register vector unsigned char pixelsv1B, pixelsv2B;
276  register vector unsigned char pixelsv1C, pixelsv2C;
277  register vector unsigned char pixelsv1D, pixelsv2D;
278 
279  register vector unsigned char perm = vec_lvsl(0, src);
280  int i;
281  register ptrdiff_t dstride2 = dstride << 1, sstride2 = sstride << 1;
282  register ptrdiff_t dstride3 = dstride2 + dstride, sstride3 = sstride + sstride2;
283  register ptrdiff_t dstride4 = dstride << 2, sstride4 = sstride << 2;
284 
285 // hand-unrolling the loop by 4 gains about 15%
286 // mininum execution time goes from 74 to 60 cycles
287 // it's faster than -funroll-loops, but using
288 // -funroll-loops w/ this is bad - 74 cycles again.
289 // all this is on a 7450, tuning for the 7450
290  for (i = 0; i < h; i += 4) {
291  pixelsv1 = vec_ld( 0, src);
292  pixelsv2 = vec_ld(15, src);
293  pixelsv1B = vec_ld(sstride, src);
294  pixelsv2B = vec_ld(15 + sstride, src);
295  pixelsv1C = vec_ld(sstride2, src);
296  pixelsv2C = vec_ld(15 + sstride2, src);
297  pixelsv1D = vec_ld(sstride3, src);
298  pixelsv2D = vec_ld(15 + sstride3, src);
299  vec_st(vec_perm(pixelsv1, pixelsv2, perm),
300  0, (unsigned char*)dst);
301  vec_st(vec_perm(pixelsv1B, pixelsv2B, perm),
302  dstride, (unsigned char*)dst);
303  vec_st(vec_perm(pixelsv1C, pixelsv2C, perm),
304  dstride2, (unsigned char*)dst);
305  vec_st(vec_perm(pixelsv1D, pixelsv2D, perm),
306  dstride3, (unsigned char*)dst);
307  src += sstride4;
308  dst += dstride4;
309  }
310 }
311 
312 #endif /* HAVE_ALTIVEC */
313 
314 av_cold void ff_vp8dsp_init_ppc(VP8DSPContext *c)
315 {
316 #if HAVE_ALTIVEC
317  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
318  return;
319 
320  c->put_vp8_epel_pixels_tab[0][0][0] = put_vp8_pixels16_altivec;
321  c->put_vp8_epel_pixels_tab[0][0][2] = put_vp8_epel16_h6_altivec;
322  c->put_vp8_epel_pixels_tab[0][2][0] = put_vp8_epel16_v6_altivec;
323  c->put_vp8_epel_pixels_tab[0][2][2] = put_vp8_epel16_h6v6_altivec;
324 
325  c->put_vp8_epel_pixels_tab[1][0][2] = put_vp8_epel8_h6_altivec;
326  c->put_vp8_epel_pixels_tab[1][2][0] = put_vp8_epel8_v6_altivec;
327  c->put_vp8_epel_pixels_tab[1][0][1] = put_vp8_epel8_h4_altivec;
328  c->put_vp8_epel_pixels_tab[1][1][0] = put_vp8_epel8_v4_altivec;
329 
330  c->put_vp8_epel_pixels_tab[1][2][2] = put_vp8_epel8_h6v6_altivec;
331  c->put_vp8_epel_pixels_tab[1][1][1] = put_vp8_epel8_h4v4_altivec;
332  c->put_vp8_epel_pixels_tab[1][1][2] = put_vp8_epel8_h6v4_altivec;
333  c->put_vp8_epel_pixels_tab[1][2][1] = put_vp8_epel8_h4v6_altivec;
334 
335  c->put_vp8_epel_pixels_tab[2][0][2] = put_vp8_epel4_h6_altivec;
336  c->put_vp8_epel_pixels_tab[2][2][0] = put_vp8_epel4_v6_altivec;
337  c->put_vp8_epel_pixels_tab[2][0][1] = put_vp8_epel4_h4_altivec;
338  c->put_vp8_epel_pixels_tab[2][1][0] = put_vp8_epel4_v4_altivec;
339 
340  c->put_vp8_epel_pixels_tab[2][2][2] = put_vp8_epel4_h6v6_altivec;
341  c->put_vp8_epel_pixels_tab[2][1][1] = put_vp8_epel4_h4v4_altivec;
342  c->put_vp8_epel_pixels_tab[2][1][2] = put_vp8_epel4_h6v4_altivec;
343  c->put_vp8_epel_pixels_tab[2][2][1] = put_vp8_epel4_h4v6_altivec;
344 #endif /* HAVE_ALTIVEC */
345 }
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