FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vp8dsp_altivec.c
Go to the documentation of this file.
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 "libavutil/cpu.h"
24 #include "libavutil/mem.h"
25 #include "libavutil/ppc/types_altivec.h"
26 #include "libavutil/ppc/util_altivec.h"
27 #include "libavcodec/vp8dsp.h"
28 #include "dsputil_altivec.h"
29 
30 #define REPT4(...) { __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__ }
31 
32 // h subpel filter uses msum to multiply+add 4 pixel taps at once
33 static const vec_s8 h_subpel_filters_inner[7] =
34 {
35  REPT4( -6, 123, 12, -1),
36  REPT4(-11, 108, 36, -8),
37  REPT4( -9, 93, 50, -6),
38  REPT4(-16, 77, 77, -16),
39  REPT4( -6, 50, 93, -9),
40  REPT4( -8, 36, 108, -11),
41  REPT4( -1, 12, 123, -6),
42 };
43 
44 // for 6tap filters, these are the outer two taps
45 // The zeros mask off pixels 4-7 when filtering 0-3
46 // and vice-versa
47 static const vec_s8 h_subpel_filters_outer[3] =
48 {
49  REPT4(0, 0, 2, 1),
50  REPT4(0, 0, 3, 3),
51  REPT4(0, 0, 1, 2),
52 };
53 
54 #define LOAD_H_SUBPEL_FILTER(i) \
55  vec_s8 filter_inner = h_subpel_filters_inner[i]; \
56  vec_s8 filter_outerh = h_subpel_filters_outer[(i)>>1]; \
57  vec_s8 filter_outerl = vec_sld(filter_outerh, filter_outerh, 2)
58 
59 #define FILTER_H(dstv, off) \
60  a = vec_ld((off)-is6tap-1, src); \
61  b = vec_ld((off)-is6tap-1+15, src); \
62 \
63  pixh = vec_perm(a, b, permh##off); \
64  pixl = vec_perm(a, b, perml##off); \
65  filth = vec_msum(filter_inner, pixh, c64); \
66  filtl = vec_msum(filter_inner, pixl, c64); \
67 \
68  if (is6tap) { \
69  outer = vec_perm(a, b, perm_6tap##off); \
70  filth = vec_msum(filter_outerh, outer, filth); \
71  filtl = vec_msum(filter_outerl, outer, filtl); \
72  } \
73  if (w == 4) \
74  filtl = filth; /* discard pixels 4-7 */ \
75  dstv = vec_packs(filth, filtl); \
76  dstv = vec_sra(dstv, c7)
77 
78 static av_always_inline
79 void put_vp8_epel_h_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
80  uint8_t *src, ptrdiff_t src_stride,
81  int h, int mx, int w, int is6tap)
82 {
83  LOAD_H_SUBPEL_FILTER(mx-1);
84  vec_u8 align_vec0, align_vec8, permh0, permh8, filt;
85  vec_u8 perm_6tap0, perm_6tap8, perml0, perml8;
86  vec_u8 a, b, pixh, pixl, outer;
87  vec_s16 f16h, f16l;
88  vec_s32 filth, filtl;
89 
90  vec_u8 perm_inner6 = { 1,2,3,4, 2,3,4,5, 3,4,5,6, 4,5,6,7 };
91  vec_u8 perm_inner4 = { 0,1,2,3, 1,2,3,4, 2,3,4,5, 3,4,5,6 };
92  vec_u8 perm_inner = is6tap ? perm_inner6 : perm_inner4;
93  vec_u8 perm_outer = { 4,9, 0,5, 5,10, 1,6, 6,11, 2,7, 7,12, 3,8 };
94  vec_s32 c64 = vec_sl(vec_splat_s32(1), vec_splat_u32(6));
95  vec_u16 c7 = vec_splat_u16(7);
96 
97  align_vec0 = vec_lvsl( -is6tap-1, src);
98  align_vec8 = vec_lvsl(8-is6tap-1, src);
99 
100  permh0 = vec_perm(align_vec0, align_vec0, perm_inner);
101  permh8 = vec_perm(align_vec8, align_vec8, perm_inner);
102  perm_inner = vec_add(perm_inner, vec_splat_u8(4));
103  perml0 = vec_perm(align_vec0, align_vec0, perm_inner);
104  perml8 = vec_perm(align_vec8, align_vec8, perm_inner);
105  perm_6tap0 = vec_perm(align_vec0, align_vec0, perm_outer);
106  perm_6tap8 = vec_perm(align_vec8, align_vec8, perm_outer);
107 
108  while (h --> 0) {
109  FILTER_H(f16h, 0);
110 
111  if (w == 16) {
112  FILTER_H(f16l, 8);
113  filt = vec_packsu(f16h, f16l);
114  vec_st(filt, 0, dst);
115  } else {
116  filt = vec_packsu(f16h, f16h);
117  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
118  if (w == 8)
119  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
120  }
121  src += src_stride;
122  dst += dst_stride;
123  }
124 }
125 
126 // v subpel filter does a simple vertical multiply + add
127 static const vec_u8 v_subpel_filters[7] =
128 {
129  { 0, 6, 123, 12, 1, 0 },
130  { 2, 11, 108, 36, 8, 1 },
131  { 0, 9, 93, 50, 6, 0 },
132  { 3, 16, 77, 77, 16, 3 },
133  { 0, 6, 50, 93, 9, 0 },
134  { 1, 8, 36, 108, 11, 2 },
135  { 0, 1, 12, 123, 6, 0 },
136 };
137 
138 #define LOAD_V_SUBPEL_FILTER(i) \
139  vec_u8 subpel_filter = v_subpel_filters[i]; \
140  vec_u8 f0 = vec_splat(subpel_filter, 0); \
141  vec_u8 f1 = vec_splat(subpel_filter, 1); \
142  vec_u8 f2 = vec_splat(subpel_filter, 2); \
143  vec_u8 f3 = vec_splat(subpel_filter, 3); \
144  vec_u8 f4 = vec_splat(subpel_filter, 4); \
145  vec_u8 f5 = vec_splat(subpel_filter, 5)
146 
147 #define FILTER_V(dstv, vec_mul) \
148  s1f = (vec_s16)vec_mul(s1, f1); \
149  s2f = (vec_s16)vec_mul(s2, f2); \
150  s3f = (vec_s16)vec_mul(s3, f3); \
151  s4f = (vec_s16)vec_mul(s4, f4); \
152  s2f = vec_subs(s2f, s1f); \
153  s3f = vec_subs(s3f, s4f); \
154  if (is6tap) { \
155  s0f = (vec_s16)vec_mul(s0, f0); \
156  s5f = (vec_s16)vec_mul(s5, f5); \
157  s2f = vec_adds(s2f, s0f); \
158  s3f = vec_adds(s3f, s5f); \
159  } \
160  dstv = vec_adds(s2f, s3f); \
161  dstv = vec_adds(dstv, c64); \
162  dstv = vec_sra(dstv, c7)
163 
164 static av_always_inline
165 void put_vp8_epel_v_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
166  uint8_t *src, ptrdiff_t src_stride,
167  int h, int my, int w, int is6tap)
168 {
169  LOAD_V_SUBPEL_FILTER(my-1);
170  vec_u8 s0, s1, s2, s3, s4, s5, filt, align_vech, perm_vec, align_vecl;
171  vec_s16 s0f, s1f, s2f, s3f, s4f, s5f, f16h, f16l;
172  vec_s16 c64 = vec_sl(vec_splat_s16(1), vec_splat_u16(6));
173  vec_u16 c7 = vec_splat_u16(7);
174 
175  // we want pixels 0-7 to be in the even positions and 8-15 in the odd,
176  // so combine this permute with the alignment permute vector
177  align_vech = vec_lvsl(0, src);
178  align_vecl = vec_sld(align_vech, align_vech, 8);
179  if (w ==16)
180  perm_vec = vec_mergeh(align_vech, align_vecl);
181  else
182  perm_vec = vec_mergeh(align_vech, align_vech);
183 
184  if (is6tap)
185  s0 = load_with_perm_vec(-2*src_stride, src, perm_vec);
186  s1 = load_with_perm_vec(-1*src_stride, src, perm_vec);
187  s2 = load_with_perm_vec( 0*src_stride, src, perm_vec);
188  s3 = load_with_perm_vec( 1*src_stride, src, perm_vec);
189  if (is6tap)
190  s4 = load_with_perm_vec( 2*src_stride, src, perm_vec);
191 
192  src += (2+is6tap)*src_stride;
193 
194  while (h --> 0) {
195  if (is6tap)
196  s5 = load_with_perm_vec(0, src, perm_vec);
197  else
198  s4 = load_with_perm_vec(0, src, perm_vec);
199 
200  FILTER_V(f16h, vec_mule);
201 
202  if (w == 16) {
203  FILTER_V(f16l, vec_mulo);
204  filt = vec_packsu(f16h, f16l);
205  vec_st(filt, 0, dst);
206  } else {
207  filt = vec_packsu(f16h, f16h);
208  if (w == 4)
209  filt = (vec_u8)vec_splat((vec_u32)filt, 0);
210  else
211  vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
212  vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
213  }
214 
215  if (is6tap)
216  s0 = s1;
217  s1 = s2;
218  s2 = s3;
219  s3 = s4;
220  if (is6tap)
221  s4 = s5;
222 
223  dst += dst_stride;
224  src += src_stride;
225  }
226 }
227 
228 #define EPEL_FUNCS(WIDTH, TAPS) \
229 static av_noinline \
230 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) \
231 { \
232  put_vp8_epel_h_altivec_core(dst, dst_stride, src, src_stride, h, mx, WIDTH, TAPS == 6); \
233 } \
234 \
235 static av_noinline \
236 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) \
237 { \
238  put_vp8_epel_v_altivec_core(dst, dst_stride, src, src_stride, h, my, WIDTH, TAPS == 6); \
239 }
240 
241 #define EPEL_HV(WIDTH, HTAPS, VTAPS) \
242 static void put_vp8_epel ## WIDTH ## _h ## HTAPS ## v ## VTAPS ## _altivec(uint8_t *dst, ptrdiff_t stride, uint8_t *src, ptrdiff_t s, int h, int mx, int my) \
243 { \
244  DECLARE_ALIGNED(16, uint8_t, tmp)[(2*WIDTH+5)*16]; \
245  if (VTAPS == 6) { \
246  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-2*stride, stride, h+5, mx, my); \
247  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, stride, tmp+2*16, 16, h, mx, my); \
248  } else { \
249  put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16, src-stride, stride, h+4, mx, my); \
250  put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, stride, tmp+16, 16, h, mx, my); \
251  } \
252 }
253 
254 EPEL_FUNCS(16,6)
255 EPEL_FUNCS(8, 6)
256 EPEL_FUNCS(8, 4)
257 EPEL_FUNCS(4, 6)
258 EPEL_FUNCS(4, 4)
259 
260 EPEL_HV(16, 6,6)
261 EPEL_HV(8, 6,6)
262 EPEL_HV(8, 4,6)
263 EPEL_HV(8, 6,4)
264 EPEL_HV(8, 4,4)
265 EPEL_HV(4, 6,6)
266 EPEL_HV(4, 4,6)
267 EPEL_HV(4, 6,4)
268 EPEL_HV(4, 4,4)
269 
270 static void put_vp8_pixels16_altivec(uint8_t *dst, ptrdiff_t stride, uint8_t *src, ptrdiff_t s, int h, int mx, int my)
271 {
272  ff_put_pixels16_altivec(dst, src, stride, h);
273 }
274 
275 av_cold void ff_vp8dsp_init_altivec(VP8DSPContext *c)
276 {
277  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
278  return;
279 
280  c->put_vp8_epel_pixels_tab[0][0][0] = put_vp8_pixels16_altivec;
281  c->put_vp8_epel_pixels_tab[0][0][2] = put_vp8_epel16_h6_altivec;
282  c->put_vp8_epel_pixels_tab[0][2][0] = put_vp8_epel16_v6_altivec;
283  c->put_vp8_epel_pixels_tab[0][2][2] = put_vp8_epel16_h6v6_altivec;
284 
285  c->put_vp8_epel_pixels_tab[1][0][2] = put_vp8_epel8_h6_altivec;
286  c->put_vp8_epel_pixels_tab[1][2][0] = put_vp8_epel8_v6_altivec;
287  c->put_vp8_epel_pixels_tab[1][0][1] = put_vp8_epel8_h4_altivec;
288  c->put_vp8_epel_pixels_tab[1][1][0] = put_vp8_epel8_v4_altivec;
289 
290  c->put_vp8_epel_pixels_tab[1][2][2] = put_vp8_epel8_h6v6_altivec;
291  c->put_vp8_epel_pixels_tab[1][1][1] = put_vp8_epel8_h4v4_altivec;
292  c->put_vp8_epel_pixels_tab[1][1][2] = put_vp8_epel8_h6v4_altivec;
293  c->put_vp8_epel_pixels_tab[1][2][1] = put_vp8_epel8_h4v6_altivec;
294 
295  c->put_vp8_epel_pixels_tab[2][0][2] = put_vp8_epel4_h6_altivec;
296  c->put_vp8_epel_pixels_tab[2][2][0] = put_vp8_epel4_v6_altivec;
297  c->put_vp8_epel_pixels_tab[2][0][1] = put_vp8_epel4_h4_altivec;
298  c->put_vp8_epel_pixels_tab[2][1][0] = put_vp8_epel4_v4_altivec;
299 
300  c->put_vp8_epel_pixels_tab[2][2][2] = put_vp8_epel4_h6v6_altivec;
301  c->put_vp8_epel_pixels_tab[2][1][1] = put_vp8_epel4_h4v4_altivec;
302  c->put_vp8_epel_pixels_tab[2][1][2] = put_vp8_epel4_h6v4_altivec;
303  c->put_vp8_epel_pixels_tab[2][2][1] = put_vp8_epel4_h4v6_altivec;
304 }
Generated on Sat May 25 2013 04:01:09 for FFmpeg by   doxygen 1.8.2