1 /*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <stdlib.h>
12 #include "loopfilter.h"
13 #include "onyxc_int.h"
14
15 typedef unsigned char uc;
16
vp8_signed_char_clamp(int t)17 static signed char vp8_signed_char_clamp(int t) {
18 t = (t < -128 ? -128 : t);
19 t = (t > 127 ? 127 : t);
20 return (signed char)t;
21 }
22
23 /* should we apply any filter at all ( 11111111 yes, 00000000 no) */
vp8_filter_mask(uc limit,uc blimit,uc p3,uc p2,uc p1,uc p0,uc q0,uc q1,uc q2,uc q3)24 static signed char vp8_filter_mask(uc limit, uc blimit, uc p3, uc p2, uc p1,
25 uc p0, uc q0, uc q1, uc q2, uc q3) {
26 signed char mask = 0;
27 mask |= (abs(p3 - p2) > limit);
28 mask |= (abs(p2 - p1) > limit);
29 mask |= (abs(p1 - p0) > limit);
30 mask |= (abs(q1 - q0) > limit);
31 mask |= (abs(q2 - q1) > limit);
32 mask |= (abs(q3 - q2) > limit);
33 mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > blimit);
34 return mask - 1;
35 }
36
37 /* is there high variance internal edge ( 11111111 yes, 00000000 no) */
vp8_hevmask(uc thresh,uc p1,uc p0,uc q0,uc q1)38 static signed char vp8_hevmask(uc thresh, uc p1, uc p0, uc q0, uc q1) {
39 signed char hev = 0;
40 hev |= (abs(p1 - p0) > thresh) * -1;
41 hev |= (abs(q1 - q0) > thresh) * -1;
42 return hev;
43 }
44
vp8_filter(signed char mask,uc hev,uc * op1,uc * op0,uc * oq0,uc * oq1)45 static void vp8_filter(signed char mask, uc hev, uc *op1, uc *op0, uc *oq0,
46 uc *oq1) {
47 signed char ps0, qs0;
48 signed char ps1, qs1;
49 signed char filter_value, Filter1, Filter2;
50 signed char u;
51
52 ps1 = (signed char)*op1 ^ 0x80;
53 ps0 = (signed char)*op0 ^ 0x80;
54 qs0 = (signed char)*oq0 ^ 0x80;
55 qs1 = (signed char)*oq1 ^ 0x80;
56
57 /* add outer taps if we have high edge variance */
58 filter_value = vp8_signed_char_clamp(ps1 - qs1);
59 filter_value &= hev;
60
61 /* inner taps */
62 filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0));
63 filter_value &= mask;
64
65 /* save bottom 3 bits so that we round one side +4 and the other +3
66 * if it equals 4 we'll set it to adjust by -1 to account for the fact
67 * we'd round it by 3 the other way
68 */
69 Filter1 = vp8_signed_char_clamp(filter_value + 4);
70 Filter2 = vp8_signed_char_clamp(filter_value + 3);
71 Filter1 >>= 3;
72 Filter2 >>= 3;
73 u = vp8_signed_char_clamp(qs0 - Filter1);
74 *oq0 = u ^ 0x80;
75 u = vp8_signed_char_clamp(ps0 + Filter2);
76 *op0 = u ^ 0x80;
77 filter_value = Filter1;
78
79 /* outer tap adjustments */
80 filter_value += 1;
81 filter_value >>= 1;
82 filter_value &= ~hev;
83
84 u = vp8_signed_char_clamp(qs1 - filter_value);
85 *oq1 = u ^ 0x80;
86 u = vp8_signed_char_clamp(ps1 + filter_value);
87 *op1 = u ^ 0x80;
88 }
89
loop_filter_horizontal_edge_c(unsigned char * s,int p,const unsigned char * blimit,const unsigned char * limit,const unsigned char * thresh,int count)90 static void loop_filter_horizontal_edge_c(unsigned char *s, int p, /* pitch */
91 const unsigned char *blimit,
92 const unsigned char *limit,
93 const unsigned char *thresh,
94 int count) {
95 int hev = 0; /* high edge variance */
96 signed char mask = 0;
97 int i = 0;
98
99 /* loop filter designed to work using chars so that we can make maximum use
100 * of 8 bit simd instructions.
101 */
102 do {
103 mask = vp8_filter_mask(limit[0], blimit[0], s[-4 * p], s[-3 * p], s[-2 * p],
104 s[-1 * p], s[0 * p], s[1 * p], s[2 * p], s[3 * p]);
105
106 hev = vp8_hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]);
107
108 vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
109
110 ++s;
111 } while (++i < count * 8);
112 }
113
loop_filter_vertical_edge_c(unsigned char * s,int p,const unsigned char * blimit,const unsigned char * limit,const unsigned char * thresh,int count)114 static void loop_filter_vertical_edge_c(unsigned char *s, int p,
115 const unsigned char *blimit,
116 const unsigned char *limit,
117 const unsigned char *thresh,
118 int count) {
119 int hev = 0; /* high edge variance */
120 signed char mask = 0;
121 int i = 0;
122
123 /* loop filter designed to work using chars so that we can make maximum use
124 * of 8 bit simd instructions.
125 */
126 do {
127 mask = vp8_filter_mask(limit[0], blimit[0], s[-4], s[-3], s[-2], s[-1],
128 s[0], s[1], s[2], s[3]);
129
130 hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
131
132 vp8_filter(mask, hev, s - 2, s - 1, s, s + 1);
133
134 s += p;
135 } while (++i < count * 8);
136 }
137
vp8_mbfilter(signed char mask,uc hev,uc * op2,uc * op1,uc * op0,uc * oq0,uc * oq1,uc * oq2)138 static void vp8_mbfilter(signed char mask, uc hev, uc *op2, uc *op1, uc *op0,
139 uc *oq0, uc *oq1, uc *oq2) {
140 signed char s, u;
141 signed char filter_value, Filter1, Filter2;
142 signed char ps2 = (signed char)*op2 ^ 0x80;
143 signed char ps1 = (signed char)*op1 ^ 0x80;
144 signed char ps0 = (signed char)*op0 ^ 0x80;
145 signed char qs0 = (signed char)*oq0 ^ 0x80;
146 signed char qs1 = (signed char)*oq1 ^ 0x80;
147 signed char qs2 = (signed char)*oq2 ^ 0x80;
148
149 /* add outer taps if we have high edge variance */
150 filter_value = vp8_signed_char_clamp(ps1 - qs1);
151 filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0));
152 filter_value &= mask;
153
154 Filter2 = filter_value;
155 Filter2 &= hev;
156
157 /* save bottom 3 bits so that we round one side +4 and the other +3 */
158 Filter1 = vp8_signed_char_clamp(Filter2 + 4);
159 Filter2 = vp8_signed_char_clamp(Filter2 + 3);
160 Filter1 >>= 3;
161 Filter2 >>= 3;
162 qs0 = vp8_signed_char_clamp(qs0 - Filter1);
163 ps0 = vp8_signed_char_clamp(ps0 + Filter2);
164
165 /* only apply wider filter if not high edge variance */
166 filter_value &= ~hev;
167 Filter2 = filter_value;
168
169 /* roughly 3/7th difference across boundary */
170 u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
171 s = vp8_signed_char_clamp(qs0 - u);
172 *oq0 = s ^ 0x80;
173 s = vp8_signed_char_clamp(ps0 + u);
174 *op0 = s ^ 0x80;
175
176 /* roughly 2/7th difference across boundary */
177 u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7);
178 s = vp8_signed_char_clamp(qs1 - u);
179 *oq1 = s ^ 0x80;
180 s = vp8_signed_char_clamp(ps1 + u);
181 *op1 = s ^ 0x80;
182
183 /* roughly 1/7th difference across boundary */
184 u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7);
185 s = vp8_signed_char_clamp(qs2 - u);
186 *oq2 = s ^ 0x80;
187 s = vp8_signed_char_clamp(ps2 + u);
188 *op2 = s ^ 0x80;
189 }
190
mbloop_filter_horizontal_edge_c(unsigned char * s,int p,const unsigned char * blimit,const unsigned char * limit,const unsigned char * thresh,int count)191 static void mbloop_filter_horizontal_edge_c(unsigned char *s, int p,
192 const unsigned char *blimit,
193 const unsigned char *limit,
194 const unsigned char *thresh,
195 int count) {
196 signed char hev = 0; /* high edge variance */
197 signed char mask = 0;
198 int i = 0;
199
200 /* loop filter designed to work using chars so that we can make maximum use
201 * of 8 bit simd instructions.
202 */
203 do {
204 mask = vp8_filter_mask(limit[0], blimit[0], s[-4 * p], s[-3 * p], s[-2 * p],
205 s[-1 * p], s[0 * p], s[1 * p], s[2 * p], s[3 * p]);
206
207 hev = vp8_hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]);
208
209 vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p,
210 s + 2 * p);
211
212 ++s;
213 } while (++i < count * 8);
214 }
215
mbloop_filter_vertical_edge_c(unsigned char * s,int p,const unsigned char * blimit,const unsigned char * limit,const unsigned char * thresh,int count)216 static void mbloop_filter_vertical_edge_c(unsigned char *s, int p,
217 const unsigned char *blimit,
218 const unsigned char *limit,
219 const unsigned char *thresh,
220 int count) {
221 signed char hev = 0; /* high edge variance */
222 signed char mask = 0;
223 int i = 0;
224
225 do {
226 mask = vp8_filter_mask(limit[0], blimit[0], s[-4], s[-3], s[-2], s[-1],
227 s[0], s[1], s[2], s[3]);
228
229 hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
230
231 vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2);
232
233 s += p;
234 } while (++i < count * 8);
235 }
236
237 /* should we apply any filter at all ( 11111111 yes, 00000000 no) */
vp8_simple_filter_mask(uc blimit,uc p1,uc p0,uc q0,uc q1)238 static signed char vp8_simple_filter_mask(uc blimit, uc p1, uc p0, uc q0,
239 uc q1) {
240 /* Why does this cause problems for win32?
241 * error C2143: syntax error : missing ';' before 'type'
242 * (void) limit;
243 */
244 signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= blimit) * -1;
245 return mask;
246 }
247
vp8_simple_filter(signed char mask,uc * op1,uc * op0,uc * oq0,uc * oq1)248 static void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0,
249 uc *oq1) {
250 signed char filter_value, Filter1, Filter2;
251 signed char p1 = (signed char)*op1 ^ 0x80;
252 signed char p0 = (signed char)*op0 ^ 0x80;
253 signed char q0 = (signed char)*oq0 ^ 0x80;
254 signed char q1 = (signed char)*oq1 ^ 0x80;
255 signed char u;
256
257 filter_value = vp8_signed_char_clamp(p1 - q1);
258 filter_value = vp8_signed_char_clamp(filter_value + 3 * (q0 - p0));
259 filter_value &= mask;
260
261 /* save bottom 3 bits so that we round one side +4 and the other +3 */
262 Filter1 = vp8_signed_char_clamp(filter_value + 4);
263 Filter1 >>= 3;
264 u = vp8_signed_char_clamp(q0 - Filter1);
265 *oq0 = u ^ 0x80;
266
267 Filter2 = vp8_signed_char_clamp(filter_value + 3);
268 Filter2 >>= 3;
269 u = vp8_signed_char_clamp(p0 + Filter2);
270 *op0 = u ^ 0x80;
271 }
272
vp8_loop_filter_simple_horizontal_edge_c(unsigned char * s,int p,const unsigned char * blimit)273 void vp8_loop_filter_simple_horizontal_edge_c(unsigned char *s, int p,
274 const unsigned char *blimit) {
275 signed char mask = 0;
276 int i = 0;
277
278 do {
279 mask = vp8_simple_filter_mask(blimit[0], s[-2 * p], s[-1 * p], s[0 * p],
280 s[1 * p]);
281 vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p);
282 ++s;
283 } while (++i < 16);
284 }
285
vp8_loop_filter_simple_vertical_edge_c(unsigned char * s,int p,const unsigned char * blimit)286 void vp8_loop_filter_simple_vertical_edge_c(unsigned char *s, int p,
287 const unsigned char *blimit) {
288 signed char mask = 0;
289 int i = 0;
290
291 do {
292 mask = vp8_simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]);
293 vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
294 s += p;
295 } while (++i < 16);
296 }
297
298 /* Horizontal MB filtering */
vp8_loop_filter_mbh_c(unsigned char * y_ptr,unsigned char * u_ptr,unsigned char * v_ptr,int y_stride,int uv_stride,loop_filter_info * lfi)299 void vp8_loop_filter_mbh_c(unsigned char *y_ptr, unsigned char *u_ptr,
300 unsigned char *v_ptr, int y_stride, int uv_stride,
301 loop_filter_info *lfi) {
302 mbloop_filter_horizontal_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim,
303 lfi->hev_thr, 2);
304
305 if (u_ptr) {
306 mbloop_filter_horizontal_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim,
307 lfi->hev_thr, 1);
308 }
309
310 if (v_ptr) {
311 mbloop_filter_horizontal_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim,
312 lfi->hev_thr, 1);
313 }
314 }
315
316 /* Vertical MB Filtering */
vp8_loop_filter_mbv_c(unsigned char * y_ptr,unsigned char * u_ptr,unsigned char * v_ptr,int y_stride,int uv_stride,loop_filter_info * lfi)317 void vp8_loop_filter_mbv_c(unsigned char *y_ptr, unsigned char *u_ptr,
318 unsigned char *v_ptr, int y_stride, int uv_stride,
319 loop_filter_info *lfi) {
320 mbloop_filter_vertical_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim,
321 lfi->hev_thr, 2);
322
323 if (u_ptr) {
324 mbloop_filter_vertical_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim,
325 lfi->hev_thr, 1);
326 }
327
328 if (v_ptr) {
329 mbloop_filter_vertical_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim,
330 lfi->hev_thr, 1);
331 }
332 }
333
334 /* Horizontal B Filtering */
vp8_loop_filter_bh_c(unsigned char * y_ptr,unsigned char * u_ptr,unsigned char * v_ptr,int y_stride,int uv_stride,loop_filter_info * lfi)335 void vp8_loop_filter_bh_c(unsigned char *y_ptr, unsigned char *u_ptr,
336 unsigned char *v_ptr, int y_stride, int uv_stride,
337 loop_filter_info *lfi) {
338 loop_filter_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, lfi->blim,
339 lfi->lim, lfi->hev_thr, 2);
340 loop_filter_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, lfi->blim,
341 lfi->lim, lfi->hev_thr, 2);
342 loop_filter_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, lfi->blim,
343 lfi->lim, lfi->hev_thr, 2);
344
345 if (u_ptr) {
346 loop_filter_horizontal_edge_c(u_ptr + 4 * uv_stride, uv_stride, lfi->blim,
347 lfi->lim, lfi->hev_thr, 1);
348 }
349
350 if (v_ptr) {
351 loop_filter_horizontal_edge_c(v_ptr + 4 * uv_stride, uv_stride, lfi->blim,
352 lfi->lim, lfi->hev_thr, 1);
353 }
354 }
355
vp8_loop_filter_bhs_c(unsigned char * y_ptr,int y_stride,const unsigned char * blimit)356 void vp8_loop_filter_bhs_c(unsigned char *y_ptr, int y_stride,
357 const unsigned char *blimit) {
358 vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride,
359 blimit);
360 vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride,
361 blimit);
362 vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride,
363 blimit);
364 }
365
366 /* Vertical B Filtering */
vp8_loop_filter_bv_c(unsigned char * y_ptr,unsigned char * u_ptr,unsigned char * v_ptr,int y_stride,int uv_stride,loop_filter_info * lfi)367 void vp8_loop_filter_bv_c(unsigned char *y_ptr, unsigned char *u_ptr,
368 unsigned char *v_ptr, int y_stride, int uv_stride,
369 loop_filter_info *lfi) {
370 loop_filter_vertical_edge_c(y_ptr + 4, y_stride, lfi->blim, lfi->lim,
371 lfi->hev_thr, 2);
372 loop_filter_vertical_edge_c(y_ptr + 8, y_stride, lfi->blim, lfi->lim,
373 lfi->hev_thr, 2);
374 loop_filter_vertical_edge_c(y_ptr + 12, y_stride, lfi->blim, lfi->lim,
375 lfi->hev_thr, 2);
376
377 if (u_ptr) {
378 loop_filter_vertical_edge_c(u_ptr + 4, uv_stride, lfi->blim, lfi->lim,
379 lfi->hev_thr, 1);
380 }
381
382 if (v_ptr) {
383 loop_filter_vertical_edge_c(v_ptr + 4, uv_stride, lfi->blim, lfi->lim,
384 lfi->hev_thr, 1);
385 }
386 }
387
vp8_loop_filter_bvs_c(unsigned char * y_ptr,int y_stride,const unsigned char * blimit)388 void vp8_loop_filter_bvs_c(unsigned char *y_ptr, int y_stride,
389 const unsigned char *blimit) {
390 vp8_loop_filter_simple_vertical_edge_c(y_ptr + 4, y_stride, blimit);
391 vp8_loop_filter_simple_vertical_edge_c(y_ptr + 8, y_stride, blimit);
392 vp8_loop_filter_simple_vertical_edge_c(y_ptr + 12, y_stride, blimit);
393 }
394