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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 
25 #include "libavutil/cpu.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/ppc/cpu.h"
29 
30 #include "libavcodec/vp8dsp.h"
31 
32 #include "hpeldsp_altivec.h"
33 
34 #if HAVE_ALTIVEC
35 #define REPT4(...) { __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__ }
36 
37 // h subpel filter uses msum to multiply+add 4 pixel taps at once
38 static const vec_s8 h_subpel_filters_inner[7] =
39 {
40  REPT4( -6, 123, 12, -1),
41  REPT4(-11, 108, 36, -8),
42  REPT4( -9, 93, 50, -6),
43  REPT4(-16, 77, 77, -16),
44  REPT4( -6, 50, 93, -9),
45  REPT4( -8, 36, 108, -11),
46  REPT4( -1, 12, 123, -6),
47 };
48 
49 // for 6tap filters, these are the outer two taps
50 // The zeros mask off pixels 4-7 when filtering 0-3
51 // and vice-versa
52 static const vec_s8 h_subpel_filters_outer[3] =
53 {
54  REPT4(0, 0, 2, 1),
55  REPT4(0, 0, 3, 3),
56  REPT4(0, 0, 1, 2),
57 };
58 
59 #define LOAD_H_SUBPEL_FILTER(i) \
60  vec_s8 filter_inner = h_subpel_filters_inner[i]; \
61  vec_s8 filter_outerh = h_subpel_filters_outer[(i)>>1]; \
62  vec_s8 filter_outerl = vec_sld(filter_outerh, filter_outerh, 2)
63 
64 #if HAVE_BIGENDIAN
65 #define GET_PIXHL(offset) \
66  a = vec_ld((offset)-is6tap-1, src); \
67  b = vec_ld((offset)-is6tap-1+15, src); \
68  pixh = vec_perm(a, b, permh##offset); \
69  pixl = vec_perm(a, b, perml##offset)
70 
71 #define GET_OUTER(offset) outer = vec_perm(a, b, perm_6tap##offset)
72 #else
73 #define GET_PIXHL(offset) \
74  a = vec_vsx_ld((offset)-is6tap-1, src); \
75  pixh = vec_perm(a, a, perm_inner); \
76  pixl = vec_perm(a, a, vec_add(perm_inner, vec_splat_u8(4)))
77 
78 #define GET_OUTER(offset) outer = vec_perm(a, a, perm_outer)
79 #endif
80 
81 #define FILTER_H(dstv, off) \
82  GET_PIXHL(off); \
83  filth = vec_msum(filter_inner, pixh, c64); \
84  filtl = vec_msum(filter_inner, pixl, c64); \
85 \
86  if (is6tap) { \
87  GET_OUTER(off); \
88  filth = vec_msum(filter_outerh, outer, filth); \
89  filtl = vec_msum(filter_outerl, outer, filtl); \
90  } \
91  if (w == 4) \
92  filtl = filth; /* discard pixels 4-7 */ \
93  dstv = vec_packs(filth, filtl); \
94  dstv = vec_sra(dstv, c7)
95 
96 static av_always_inline
97 void put_vp8_epel_h_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
98  uint8_t *src, ptrdiff_t src_stride,
99  int h, int mx, int w, int is6tap)
100 {
101  LOAD_H_SUBPEL_FILTER(mx-1);
102 #if HAVE_BIGENDIAN
103  vec_u8 align_vec0, align_vec8, permh0, permh8;
104  vec_u8 perm_6tap0, perm_6tap8, perml0, perml8;
105  vec_u8 b;
106 #endif
107  vec_u8 filt, a, pixh, pixl, outer;
108  vec_s16 f16h, f16l;
109  vec_s32 filth, filtl;
110 
111  vec_u8 perm_inner6 = { 1,2,3,4, 2,3,4,5, 3,4,5,6, 4,5,6,7 };
112  vec_u8 perm_inner4 = { 0,1,2,3, 1,2,3,4, 2,3,4,5, 3,4,5,6 };
113  vec_u8 perm_inner = is6tap ? perm_inner6 : perm_inner4;
114  vec_u8 perm_outer = { 4,9, 0,5, 5,10, 1,6, 6,11, 2,7, 7,12, 3,8 };
115  vec_s32 c64 = vec_sl(vec_splat_s32(1), vec_splat_u32(6));
116  vec_u16 c7 = vec_splat_u16(7);
117 
118 #if HAVE_BIGENDIAN
119  align_vec0 = vec_lvsl( -is6tap-1, src);
120  align_vec8 = vec_lvsl(8-is6tap-1, src);
121 
122  permh0 = vec_perm(align_vec0, align_vec0, perm_inner);
123  permh8 = vec_perm(align_vec8, align_vec8, perm_inner);
124  perm_inner = vec_add(perm_inner, vec_splat_u8(4));
125  perml0 = vec_perm(align_vec0, align_vec0, perm_inner);
126  perml8 = vec_perm(align_vec8, align_vec8, perm_inner);
127  perm_6tap0 = vec_perm(align_vec0, align_vec0, perm_outer);
128  perm_6tap8 = vec_perm(align_vec8, align_vec8, perm_outer);
129 #endif
130 
131  while (h --> 0) {
132  FILTER_H(f16h, 0);
133 
134  if (w == 16) {
135  FILTER_H(f16l, 8);
136  filt = vec_packsu(f16h, f16l);
137  vec_st(filt, 0, dst);
138  } else {
139  filt = vec_packsu(f16h, f16h);
140  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
141  if (w == 8)
142  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
143  }
144  src += src_stride;
145  dst += dst_stride;
146  }
147 }
148 
149 // v subpel filter does a simple vertical multiply + add
150 static const vec_u8 v_subpel_filters[7] =
151 {
152  { 0, 6, 123, 12, 1, 0 },
153  { 2, 11, 108, 36, 8, 1 },
154  { 0, 9, 93, 50, 6, 0 },
155  { 3, 16, 77, 77, 16, 3 },
156  { 0, 6, 50, 93, 9, 0 },
157  { 1, 8, 36, 108, 11, 2 },
158  { 0, 1, 12, 123, 6, 0 },
159 };
160 
161 #define LOAD_V_SUBPEL_FILTER(i) \
162  vec_u8 subpel_filter = v_subpel_filters[i]; \
163  vec_u8 f0 = vec_splat(subpel_filter, 0); \
164  vec_u8 f1 = vec_splat(subpel_filter, 1); \
165  vec_u8 f2 = vec_splat(subpel_filter, 2); \
166  vec_u8 f3 = vec_splat(subpel_filter, 3); \
167  vec_u8 f4 = vec_splat(subpel_filter, 4); \
168  vec_u8 f5 = vec_splat(subpel_filter, 5)
169 
170 #define FILTER_V(dstv, vec_mul) \
171  s1f = (vec_s16)vec_mul(s1, f1); \
172  s2f = (vec_s16)vec_mul(s2, f2); \
173  s3f = (vec_s16)vec_mul(s3, f3); \
174  s4f = (vec_s16)vec_mul(s4, f4); \
175  s2f = vec_subs(s2f, s1f); \
176  s3f = vec_subs(s3f, s4f); \
177  if (is6tap) { \
178  s0f = (vec_s16)vec_mul(s0, f0); \
179  s5f = (vec_s16)vec_mul(s5, f5); \
180  s2f = vec_adds(s2f, s0f); \
181  s3f = vec_adds(s3f, s5f); \
182  } \
183  dstv = vec_adds(s2f, s3f); \
184  dstv = vec_adds(dstv, c64); \
185  dstv = vec_sra(dstv, c7)
186 
187 #if HAVE_BIGENDIAN
188 #define LOAD_HL(off, s, perm) load_with_perm_vec(off, s, perm)
189 #else
190 #define LOAD_HL(off, s, perm) vec_mergeh(vec_vsx_ld(off,s), vec_vsx_ld(off+8,s))
191 #endif
192 
193 static av_always_inline
194 void put_vp8_epel_v_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
195  uint8_t *src, ptrdiff_t src_stride,
196  int h, int my, int w, int is6tap)
197 {
198  LOAD_V_SUBPEL_FILTER(my-1);
199  vec_u8 s0, s1, s2, s3, s4, s5, filt, align_vech, perm_vec, align_vecl;
200  vec_s16 s0f, s1f, s2f, s3f, s4f, s5f, f16h, f16l;
201  vec_s16 c64 = vec_sl(vec_splat_s16(1), vec_splat_u16(6));
202  vec_u16 c7 = vec_splat_u16(7);
203 
204 #if HAVE_BIGENDIAN
205  // we want pixels 0-7 to be in the even positions and 8-15 in the odd,
206  // so combine this permute with the alignment permute vector
207  align_vech = vec_lvsl(0, src);
208  align_vecl = vec_sld(align_vech, align_vech, 8);
209  if (w ==16)
210  perm_vec = vec_mergeh(align_vech, align_vecl);
211  else
212  perm_vec = vec_mergeh(align_vech, align_vech);
213 #endif
214 
215  if (is6tap)
216  s0 = LOAD_HL(-2*src_stride, src, perm_vec);
217  s1 = LOAD_HL(-1*src_stride, src, perm_vec);
218  s2 = LOAD_HL( 0*src_stride, src, perm_vec);
219  s3 = LOAD_HL( 1*src_stride, src, perm_vec);
220  if (is6tap)
221  s4 = LOAD_HL( 2*src_stride, src, perm_vec);
222 
223  src += (2+is6tap)*src_stride;
224 
225  while (h --> 0) {
226  if (is6tap)
227  s5 = LOAD_HL(0, src, perm_vec);
228  else
229  s4 = LOAD_HL(0, src, perm_vec);
230 
231  FILTER_V(f16h, vec_mule);
232 
233  if (w == 16) {
234  FILTER_V(f16l, vec_mulo);
235  filt = vec_packsu(f16h, f16l);
236  vec_st(filt, 0, dst);
237  } else {
238  filt = vec_packsu(f16h, f16h);
239  if (w == 4)
240  filt = (vec_u8)vec_splat((vec_u32)filt, 0);
241  else
242  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
243  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
244  }
245 
246  if (is6tap)
247  s0 = s1;
248  s1 = s2;
249  s2 = s3;
250  s3 = s4;
251  if (is6tap)
252  s4 = s5;
253 
254  dst += dst_stride;
255  src += src_stride;
256  }
257 }
258 
259 #define EPEL_FUNCS(WIDTH, TAPS) \
260 static av_noinline \
261 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) \
262 { \
263  put_vp8_epel_h_altivec_core(dst, dst_stride, src, src_stride, h, mx, WIDTH, TAPS == 6); \
264 } \
265 \
266 static av_noinline \
267 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) \
268 { \
269  put_vp8_epel_v_altivec_core(dst, dst_stride, src, src_stride, h, my, WIDTH, TAPS == 6); \
270 }
271 
272 #define EPEL_HV(WIDTH, HTAPS, VTAPS) \
273 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) \
274 { \
275  DECLARE_ALIGNED(16, uint8_t, tmp)[(2*WIDTH+5)*16]; \
276  if (VTAPS == 6) { \
277  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-2*sstride, sstride, h+5, mx, my); \
278  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, dstride, tmp+2*16, 16, h, mx, my); \
279  } else { \
280  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-sstride, sstride, h+4, mx, my); \
281  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, dstride, tmp+16, 16, h, mx, my); \
282  } \
283 }
284 
285 EPEL_FUNCS(16,6)
286 EPEL_FUNCS(8, 6)
287 EPEL_FUNCS(8, 4)
288 EPEL_FUNCS(4, 6)
289 EPEL_FUNCS(4, 4)
290 
291 EPEL_HV(16, 6,6)
292 EPEL_HV(8, 6,6)
293 EPEL_HV(8, 4,6)
294 EPEL_HV(8, 6,4)
295 EPEL_HV(8, 4,4)
296 EPEL_HV(4, 6,6)
297 EPEL_HV(4, 4,6)
298 EPEL_HV(4, 6,4)
299 EPEL_HV(4, 4,4)
300 
301 static void put_vp8_pixels16_altivec(uint8_t *dst, ptrdiff_t dstride, uint8_t *src, ptrdiff_t sstride, int h, int mx, int my)
302 {
303  register vector unsigned char perm;
304  int i;
305  register ptrdiff_t dstride2 = dstride << 1, sstride2 = sstride << 1;
306  register ptrdiff_t dstride3 = dstride2 + dstride, sstride3 = sstride + sstride2;
307  register ptrdiff_t dstride4 = dstride << 2, sstride4 = sstride << 2;
308 
309 #if HAVE_BIGENDIAN
310  perm = vec_lvsl(0, src);
311 #endif
312 // hand-unrolling the loop by 4 gains about 15%
313 // mininum execution time goes from 74 to 60 cycles
314 // it's faster than -funroll-loops, but using
315 // -funroll-loops w/ this is bad - 74 cycles again.
316 // all this is on a 7450, tuning for the 7450
317  for (i = 0; i < h; i += 4) {
318  vec_st(load_with_perm_vec(0, src, perm), 0, dst);
319  vec_st(load_with_perm_vec(sstride, src, perm), dstride, dst);
320  vec_st(load_with_perm_vec(sstride2, src, perm), dstride2, dst);
321  vec_st(load_with_perm_vec(sstride3, src, perm), dstride3, dst);
322  src += sstride4;
323  dst += dstride4;
324  }
325 }
326 
327 #endif /* HAVE_ALTIVEC */
328 
329 
331 {
332 #if HAVE_ALTIVEC
334  return;
335 
336  c->put_vp8_epel_pixels_tab[0][0][0] = put_vp8_pixels16_altivec;
337  c->put_vp8_epel_pixels_tab[0][0][2] = put_vp8_epel16_h6_altivec;
338  c->put_vp8_epel_pixels_tab[0][2][0] = put_vp8_epel16_v6_altivec;
339  c->put_vp8_epel_pixels_tab[0][2][2] = put_vp8_epel16_h6v6_altivec;
340 
341  c->put_vp8_epel_pixels_tab[1][0][2] = put_vp8_epel8_h6_altivec;
342  c->put_vp8_epel_pixels_tab[1][2][0] = put_vp8_epel8_v6_altivec;
343  c->put_vp8_epel_pixels_tab[1][0][1] = put_vp8_epel8_h4_altivec;
344  c->put_vp8_epel_pixels_tab[1][1][0] = put_vp8_epel8_v4_altivec;
345 
346  c->put_vp8_epel_pixels_tab[1][2][2] = put_vp8_epel8_h6v6_altivec;
347  c->put_vp8_epel_pixels_tab[1][1][1] = put_vp8_epel8_h4v4_altivec;
348  c->put_vp8_epel_pixels_tab[1][1][2] = put_vp8_epel8_h6v4_altivec;
349  c->put_vp8_epel_pixels_tab[1][2][1] = put_vp8_epel8_h4v6_altivec;
350 
351  c->put_vp8_epel_pixels_tab[2][0][2] = put_vp8_epel4_h6_altivec;
352  c->put_vp8_epel_pixels_tab[2][2][0] = put_vp8_epel4_v6_altivec;
353  c->put_vp8_epel_pixels_tab[2][0][1] = put_vp8_epel4_h4_altivec;
354  c->put_vp8_epel_pixels_tab[2][1][0] = put_vp8_epel4_v4_altivec;
355 
356  c->put_vp8_epel_pixels_tab[2][2][2] = put_vp8_epel4_h6v6_altivec;
357  c->put_vp8_epel_pixels_tab[2][1][1] = put_vp8_epel4_h4v4_altivec;
358  c->put_vp8_epel_pixels_tab[2][1][2] = put_vp8_epel4_h6v4_altivec;
359  c->put_vp8_epel_pixels_tab[2][2][1] = put_vp8_epel4_h4v6_altivec;
360 #endif /* HAVE_ALTIVEC */
361 }
#define vec_s8
Definition: util_altivec.h:35
Memory handling functions.
av_cold void ff_vp78dsp_init_ppc(VP8DSPContext *c)
const char * b
Definition: vf_curves.c:113
#define vec_s32
Definition: util_altivec.h:39
#define src
Definition: vp8dsp.c:254
vp8_mc_func put_vp8_epel_pixels_tab[3][3][3]
first dimension: 4-log2(width) second dimension: 0 if no vertical interpolation is needed; 1 4-tap ve...
Definition: vp8dsp.h:80
uint8_t
#define av_cold
Definition: attributes.h:82
VP8 compatible video decoder.
#define vec_s16
Definition: util_altivec.h:37
#define s2
Definition: regdef.h:39
#define PPC_ALTIVEC(flags)
Definition: cpu.h:26
#define s0
Definition: regdef.h:37
#define s5
Definition: regdef.h:42
perm
Definition: f_perms.c:74
#define vec_u8
Definition: util_altivec.h:34
#define s4
Definition: regdef.h:41
#define s3
Definition: regdef.h:40
#define vec_u32
Definition: util_altivec.h:38
#define s1
Definition: regdef.h:38
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:92
Contains misc utility macros and inline functions.
static const int8_t filt[NUMTAPS]
Definition: af_earwax.c:39
static double c[64]
#define vec_u16
Definition: util_altivec.h:36
#define EPEL_FUNCS(depth)
#define av_always_inline
Definition: attributes.h:39