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"
28 #include "libavutil/ppc/util_altivec.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
put_vp8_epel_h_altivec_core(uint8_t * dst,ptrdiff_t dst_stride,uint8_t * src,ptrdiff_t src_stride,int h,int mx,int w,int is6tap)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
put_vp8_epel_v_altivec_core(uint8_t * dst,ptrdiff_t dst_stride,uint8_t * src,ptrdiff_t src_stride,int h,int my,int w,int is6tap)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
put_vp8_pixels16_altivec(uint8_t * dst,ptrdiff_t dstride,uint8_t * src,ptrdiff_t sstride,int h,int mx,int my)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
ff_vp78dsp_init_ppc(VP8DSPContext * c)330 av_cold void ff_vp78dsp_init_ppc(VP8DSPContext *c)
331 {
332 #if HAVE_ALTIVEC
333 if (!PPC_ALTIVEC(av_get_cpu_flags()))
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 }
362