Line data Source code
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 :
17 0 : static signed char vp8_signed_char_clamp(int t) {
18 0 : t = (t < -128 ? -128 : t);
19 0 : t = (t > 127 ? 127 : t);
20 0 : return (signed char)t;
21 : }
22 :
23 : /* should we apply any filter at all ( 11111111 yes, 00000000 no) */
24 0 : 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 0 : signed char mask = 0;
27 0 : mask |= (abs(p3 - p2) > limit);
28 0 : mask |= (abs(p2 - p1) > limit);
29 0 : mask |= (abs(p1 - p0) > limit);
30 0 : mask |= (abs(q1 - q0) > limit);
31 0 : mask |= (abs(q2 - q1) > limit);
32 0 : mask |= (abs(q3 - q2) > limit);
33 0 : mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > blimit);
34 0 : return mask - 1;
35 : }
36 :
37 : /* is there high variance internal edge ( 11111111 yes, 00000000 no) */
38 0 : static signed char vp8_hevmask(uc thresh, uc p1, uc p0, uc q0, uc q1) {
39 0 : signed char hev = 0;
40 0 : hev |= (abs(p1 - p0) > thresh) * -1;
41 0 : hev |= (abs(q1 - q0) > thresh) * -1;
42 0 : return hev;
43 : }
44 :
45 0 : 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 0 : ps1 = (signed char)*op1 ^ 0x80;
53 0 : ps0 = (signed char)*op0 ^ 0x80;
54 0 : qs0 = (signed char)*oq0 ^ 0x80;
55 0 : qs1 = (signed char)*oq1 ^ 0x80;
56 :
57 : /* add outer taps if we have high edge variance */
58 0 : filter_value = vp8_signed_char_clamp(ps1 - qs1);
59 0 : filter_value &= hev;
60 :
61 : /* inner taps */
62 0 : filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0));
63 0 : 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 0 : Filter1 = vp8_signed_char_clamp(filter_value + 4);
70 0 : Filter2 = vp8_signed_char_clamp(filter_value + 3);
71 0 : Filter1 >>= 3;
72 0 : Filter2 >>= 3;
73 0 : u = vp8_signed_char_clamp(qs0 - Filter1);
74 0 : *oq0 = u ^ 0x80;
75 0 : u = vp8_signed_char_clamp(ps0 + Filter2);
76 0 : *op0 = u ^ 0x80;
77 0 : filter_value = Filter1;
78 :
79 : /* outer tap adjustments */
80 0 : filter_value += 1;
81 0 : filter_value >>= 1;
82 0 : filter_value &= ~hev;
83 :
84 0 : u = vp8_signed_char_clamp(qs1 - filter_value);
85 0 : *oq1 = u ^ 0x80;
86 0 : u = vp8_signed_char_clamp(ps1 + filter_value);
87 0 : *op1 = u ^ 0x80;
88 0 : }
89 0 : void vp8_loop_filter_horizontal_edge_c(unsigned char *s, int p, /* pitch */
90 : const unsigned char *blimit,
91 : const unsigned char *limit,
92 : const unsigned char *thresh, int count) {
93 0 : int hev = 0; /* high edge variance */
94 0 : signed char mask = 0;
95 0 : int i = 0;
96 :
97 : /* loop filter designed to work using chars so that we can make maximum use
98 : * of 8 bit simd instructions.
99 : */
100 : do {
101 0 : mask = vp8_filter_mask(limit[0], blimit[0], s[-4 * p], s[-3 * p], s[-2 * p],
102 0 : s[-1 * p], s[0 * p], s[1 * p], s[2 * p], s[3 * p]);
103 :
104 0 : hev = vp8_hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]);
105 :
106 0 : vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
107 :
108 0 : ++s;
109 0 : } while (++i < count * 8);
110 0 : }
111 :
112 0 : void vp8_loop_filter_vertical_edge_c(unsigned char *s, int p,
113 : const unsigned char *blimit,
114 : const unsigned char *limit,
115 : const unsigned char *thresh, int count) {
116 0 : int hev = 0; /* high edge variance */
117 0 : signed char mask = 0;
118 0 : int i = 0;
119 :
120 : /* loop filter designed to work using chars so that we can make maximum use
121 : * of 8 bit simd instructions.
122 : */
123 : do {
124 0 : mask = vp8_filter_mask(limit[0], blimit[0], s[-4], s[-3], s[-2], s[-1],
125 0 : s[0], s[1], s[2], s[3]);
126 :
127 0 : hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
128 :
129 0 : vp8_filter(mask, hev, s - 2, s - 1, s, s + 1);
130 :
131 0 : s += p;
132 0 : } while (++i < count * 8);
133 0 : }
134 :
135 0 : static void vp8_mbfilter(signed char mask, uc hev, uc *op2, uc *op1, uc *op0,
136 : uc *oq0, uc *oq1, uc *oq2) {
137 : signed char s, u;
138 : signed char filter_value, Filter1, Filter2;
139 0 : signed char ps2 = (signed char)*op2 ^ 0x80;
140 0 : signed char ps1 = (signed char)*op1 ^ 0x80;
141 0 : signed char ps0 = (signed char)*op0 ^ 0x80;
142 0 : signed char qs0 = (signed char)*oq0 ^ 0x80;
143 0 : signed char qs1 = (signed char)*oq1 ^ 0x80;
144 0 : signed char qs2 = (signed char)*oq2 ^ 0x80;
145 :
146 : /* add outer taps if we have high edge variance */
147 0 : filter_value = vp8_signed_char_clamp(ps1 - qs1);
148 0 : filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0));
149 0 : filter_value &= mask;
150 :
151 0 : Filter2 = filter_value;
152 0 : Filter2 &= hev;
153 :
154 : /* save bottom 3 bits so that we round one side +4 and the other +3 */
155 0 : Filter1 = vp8_signed_char_clamp(Filter2 + 4);
156 0 : Filter2 = vp8_signed_char_clamp(Filter2 + 3);
157 0 : Filter1 >>= 3;
158 0 : Filter2 >>= 3;
159 0 : qs0 = vp8_signed_char_clamp(qs0 - Filter1);
160 0 : ps0 = vp8_signed_char_clamp(ps0 + Filter2);
161 :
162 : /* only apply wider filter if not high edge variance */
163 0 : filter_value &= ~hev;
164 0 : Filter2 = filter_value;
165 :
166 : /* roughly 3/7th difference across boundary */
167 0 : u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
168 0 : s = vp8_signed_char_clamp(qs0 - u);
169 0 : *oq0 = s ^ 0x80;
170 0 : s = vp8_signed_char_clamp(ps0 + u);
171 0 : *op0 = s ^ 0x80;
172 :
173 : /* roughly 2/7th difference across boundary */
174 0 : u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7);
175 0 : s = vp8_signed_char_clamp(qs1 - u);
176 0 : *oq1 = s ^ 0x80;
177 0 : s = vp8_signed_char_clamp(ps1 + u);
178 0 : *op1 = s ^ 0x80;
179 :
180 : /* roughly 1/7th difference across boundary */
181 0 : u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7);
182 0 : s = vp8_signed_char_clamp(qs2 - u);
183 0 : *oq2 = s ^ 0x80;
184 0 : s = vp8_signed_char_clamp(ps2 + u);
185 0 : *op2 = s ^ 0x80;
186 0 : }
187 :
188 0 : void vp8_mbloop_filter_horizontal_edge_c(unsigned char *s, int p,
189 : const unsigned char *blimit,
190 : const unsigned char *limit,
191 : const unsigned char *thresh,
192 : int count) {
193 0 : signed char hev = 0; /* high edge variance */
194 0 : signed char mask = 0;
195 0 : int i = 0;
196 :
197 : /* loop filter designed to work using chars so that we can make maximum use
198 : * of 8 bit simd instructions.
199 : */
200 : do {
201 0 : mask = vp8_filter_mask(limit[0], blimit[0], s[-4 * p], s[-3 * p], s[-2 * p],
202 0 : s[-1 * p], s[0 * p], s[1 * p], s[2 * p], s[3 * p]);
203 :
204 0 : hev = vp8_hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]);
205 :
206 0 : vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p,
207 0 : s + 2 * p);
208 :
209 0 : ++s;
210 0 : } while (++i < count * 8);
211 0 : }
212 :
213 0 : void vp8_mbloop_filter_vertical_edge_c(unsigned char *s, int p,
214 : const unsigned char *blimit,
215 : const unsigned char *limit,
216 : const unsigned char *thresh, int count) {
217 0 : signed char hev = 0; /* high edge variance */
218 0 : signed char mask = 0;
219 0 : int i = 0;
220 :
221 : do {
222 0 : mask = vp8_filter_mask(limit[0], blimit[0], s[-4], s[-3], s[-2], s[-1],
223 0 : s[0], s[1], s[2], s[3]);
224 :
225 0 : hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
226 :
227 0 : vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2);
228 :
229 0 : s += p;
230 0 : } while (++i < count * 8);
231 0 : }
232 :
233 : /* should we apply any filter at all ( 11111111 yes, 00000000 no) */
234 0 : static signed char vp8_simple_filter_mask(uc blimit, uc p1, uc p0, uc q0,
235 : uc q1) {
236 : /* Why does this cause problems for win32?
237 : * error C2143: syntax error : missing ';' before 'type'
238 : * (void) limit;
239 : */
240 0 : signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= blimit) * -1;
241 0 : return mask;
242 : }
243 :
244 0 : static void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0,
245 : uc *oq1) {
246 : signed char filter_value, Filter1, Filter2;
247 0 : signed char p1 = (signed char)*op1 ^ 0x80;
248 0 : signed char p0 = (signed char)*op0 ^ 0x80;
249 0 : signed char q0 = (signed char)*oq0 ^ 0x80;
250 0 : signed char q1 = (signed char)*oq1 ^ 0x80;
251 : signed char u;
252 :
253 0 : filter_value = vp8_signed_char_clamp(p1 - q1);
254 0 : filter_value = vp8_signed_char_clamp(filter_value + 3 * (q0 - p0));
255 0 : filter_value &= mask;
256 :
257 : /* save bottom 3 bits so that we round one side +4 and the other +3 */
258 0 : Filter1 = vp8_signed_char_clamp(filter_value + 4);
259 0 : Filter1 >>= 3;
260 0 : u = vp8_signed_char_clamp(q0 - Filter1);
261 0 : *oq0 = u ^ 0x80;
262 :
263 0 : Filter2 = vp8_signed_char_clamp(filter_value + 3);
264 0 : Filter2 >>= 3;
265 0 : u = vp8_signed_char_clamp(p0 + Filter2);
266 0 : *op0 = u ^ 0x80;
267 0 : }
268 :
269 0 : void vp8_loop_filter_simple_horizontal_edge_c(unsigned char *s, int p,
270 : const unsigned char *blimit) {
271 0 : signed char mask = 0;
272 0 : int i = 0;
273 :
274 : do {
275 0 : mask = vp8_simple_filter_mask(blimit[0], s[-2 * p], s[-1 * p], s[0 * p],
276 0 : s[1 * p]);
277 0 : vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p);
278 0 : ++s;
279 0 : } while (++i < 16);
280 0 : }
281 :
282 0 : void vp8_loop_filter_simple_vertical_edge_c(unsigned char *s, int p,
283 : const unsigned char *blimit) {
284 0 : signed char mask = 0;
285 0 : int i = 0;
286 :
287 : do {
288 0 : mask = vp8_simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]);
289 0 : vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
290 0 : s += p;
291 0 : } while (++i < 16);
292 0 : }
293 :
294 : /* Horizontal MB filtering */
295 0 : void vp8_loop_filter_mbh_c(unsigned char *y_ptr, unsigned char *u_ptr,
296 : unsigned char *v_ptr, int y_stride, int uv_stride,
297 : loop_filter_info *lfi) {
298 0 : vp8_mbloop_filter_horizontal_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim,
299 : lfi->hev_thr, 2);
300 :
301 0 : if (u_ptr) {
302 0 : vp8_mbloop_filter_horizontal_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim,
303 : lfi->hev_thr, 1);
304 : }
305 :
306 0 : if (v_ptr) {
307 0 : vp8_mbloop_filter_horizontal_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim,
308 : lfi->hev_thr, 1);
309 : }
310 0 : }
311 :
312 : /* Vertical MB Filtering */
313 0 : void vp8_loop_filter_mbv_c(unsigned char *y_ptr, unsigned char *u_ptr,
314 : unsigned char *v_ptr, int y_stride, int uv_stride,
315 : loop_filter_info *lfi) {
316 0 : vp8_mbloop_filter_vertical_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim,
317 : lfi->hev_thr, 2);
318 :
319 0 : if (u_ptr) {
320 0 : vp8_mbloop_filter_vertical_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim,
321 : lfi->hev_thr, 1);
322 : }
323 :
324 0 : if (v_ptr) {
325 0 : vp8_mbloop_filter_vertical_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim,
326 : lfi->hev_thr, 1);
327 : }
328 0 : }
329 :
330 : /* Horizontal B Filtering */
331 0 : void vp8_loop_filter_bh_c(unsigned char *y_ptr, unsigned char *u_ptr,
332 : unsigned char *v_ptr, int y_stride, int uv_stride,
333 : loop_filter_info *lfi) {
334 0 : vp8_loop_filter_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, lfi->blim,
335 : lfi->lim, lfi->hev_thr, 2);
336 0 : vp8_loop_filter_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, lfi->blim,
337 : lfi->lim, lfi->hev_thr, 2);
338 0 : vp8_loop_filter_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, lfi->blim,
339 : lfi->lim, lfi->hev_thr, 2);
340 :
341 0 : if (u_ptr) {
342 0 : vp8_loop_filter_horizontal_edge_c(u_ptr + 4 * uv_stride, uv_stride,
343 : lfi->blim, lfi->lim, lfi->hev_thr, 1);
344 : }
345 :
346 0 : if (v_ptr) {
347 0 : vp8_loop_filter_horizontal_edge_c(v_ptr + 4 * uv_stride, uv_stride,
348 : lfi->blim, lfi->lim, lfi->hev_thr, 1);
349 : }
350 0 : }
351 :
352 0 : void vp8_loop_filter_bhs_c(unsigned char *y_ptr, int y_stride,
353 : const unsigned char *blimit) {
354 0 : vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride,
355 : blimit);
356 0 : vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride,
357 : blimit);
358 0 : vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride,
359 : blimit);
360 0 : }
361 :
362 : /* Vertical B Filtering */
363 0 : void vp8_loop_filter_bv_c(unsigned char *y_ptr, unsigned char *u_ptr,
364 : unsigned char *v_ptr, int y_stride, int uv_stride,
365 : loop_filter_info *lfi) {
366 0 : vp8_loop_filter_vertical_edge_c(y_ptr + 4, y_stride, lfi->blim, lfi->lim,
367 : lfi->hev_thr, 2);
368 0 : vp8_loop_filter_vertical_edge_c(y_ptr + 8, y_stride, lfi->blim, lfi->lim,
369 : lfi->hev_thr, 2);
370 0 : vp8_loop_filter_vertical_edge_c(y_ptr + 12, y_stride, lfi->blim, lfi->lim,
371 : lfi->hev_thr, 2);
372 :
373 0 : if (u_ptr) {
374 0 : vp8_loop_filter_vertical_edge_c(u_ptr + 4, uv_stride, lfi->blim, lfi->lim,
375 : lfi->hev_thr, 1);
376 : }
377 :
378 0 : if (v_ptr) {
379 0 : vp8_loop_filter_vertical_edge_c(v_ptr + 4, uv_stride, lfi->blim, lfi->lim,
380 : lfi->hev_thr, 1);
381 : }
382 0 : }
383 :
384 0 : void vp8_loop_filter_bvs_c(unsigned char *y_ptr, int y_stride,
385 : const unsigned char *blimit) {
386 0 : vp8_loop_filter_simple_vertical_edge_c(y_ptr + 4, y_stride, blimit);
387 0 : vp8_loop_filter_simple_vertical_edge_c(y_ptr + 8, y_stride, blimit);
388 0 : vp8_loop_filter_simple_vertical_edge_c(y_ptr + 12, y_stride, blimit);
389 0 : }
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