2 * Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
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.
13 #include "loopfilter.h"
14 #include "onyxc_int.h"
17 #define NEW_LOOPFILTER_MASK
19 typedef unsigned char uc;
21 __inline signed char vp8_signed_char_clamp(int t)
23 t = (t < -128 ? -128 : t);
24 t = (t > 127 ? 127 : t);
25 return (signed char) t;
29 // should we apply any filter at all ( 11111111 yes, 00000000 no)
30 __inline signed char vp8_filter_mask(signed char limit, signed char flimit,
31 uc p3, uc p2, uc p1, uc p0, uc q0, uc q1, uc q2, uc q3)
34 mask |= (abs(p3 - p2) > limit) * -1;
35 mask |= (abs(p2 - p1) > limit) * -1;
36 mask |= (abs(p1 - p0) > limit) * -1;
37 mask |= (abs(q1 - q0) > limit) * -1;
38 mask |= (abs(q2 - q1) > limit) * -1;
39 mask |= (abs(q3 - q2) > limit) * -1;
40 #ifndef NEW_LOOPFILTER_MASK
41 mask |= (abs(p0 - q0) > flimit) * -1;
43 mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > flimit * 2 + limit) * -1;
49 // is there high variance internal edge ( 11111111 yes, 00000000 no)
50 __inline signed char vp8_hevmask(signed char thresh, uc p1, uc p0, uc q0, uc q1)
53 hev |= (abs(p1 - p0) > thresh) * -1;
54 hev |= (abs(q1 - q0) > thresh) * -1;
58 __inline void vp8_filter(signed char mask, signed char hev, uc *op1, uc *op0, uc *oq0, uc *oq1)
63 signed char vp8_filter, Filter1, Filter2;
66 ps1 = (signed char) * op1 ^ 0x80;
67 ps0 = (signed char) * op0 ^ 0x80;
68 qs0 = (signed char) * oq0 ^ 0x80;
69 qs1 = (signed char) * oq1 ^ 0x80;
71 // add outer taps if we have high edge variance
72 vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
76 vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
79 // save bottom 3 bits so that we round one side +4 and the other +3
80 // if it equals 4 we'll set to adjust by -1 to account for the fact
81 // we'd round 3 the other way
82 Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
83 Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
86 u = vp8_signed_char_clamp(qs0 - Filter1);
88 u = vp8_signed_char_clamp(ps0 + Filter2);
92 // outer tap adjustments
97 u = vp8_signed_char_clamp(qs1 - vp8_filter);
99 u = vp8_signed_char_clamp(ps1 + vp8_filter);
103 void vp8_loop_filter_horizontal_edge_c
107 const signed char *flimit,
108 const signed char *limit,
109 const signed char *thresh,
113 int hev = 0; // high edge variance
114 signed char mask = 0;
117 // loop filter designed to work using chars so that we can make maximum use
118 // of 8 bit simd instructions.
121 mask = vp8_filter_mask(limit[i], flimit[i],
122 s[-4*p], s[-3*p], s[-2*p], s[-1*p],
123 s[0*p], s[1*p], s[2*p], s[3*p]);
125 hev = vp8_hevmask(thresh[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
127 vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
131 while (++i < count * 8);
134 void vp8_loop_filter_vertical_edge_c
138 const signed char *flimit,
139 const signed char *limit,
140 const signed char *thresh,
144 int hev = 0; // high edge variance
145 signed char mask = 0;
148 // loop filter designed to work using chars so that we can make maximum use
149 // of 8 bit simd instructions.
152 mask = vp8_filter_mask(limit[i], flimit[i],
153 s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
155 hev = vp8_hevmask(thresh[i], s[-2], s[-1], s[0], s[1]);
157 vp8_filter(mask, hev, s - 2, s - 1, s, s + 1);
161 while (++i < count * 8);
164 __inline void vp8_mbfilter(signed char mask, signed char hev,
165 uc *op2, uc *op1, uc *op0, uc *oq0, uc *oq1, uc *oq2)
168 signed char vp8_filter, Filter1, Filter2;
169 signed char ps2 = (signed char) * op2 ^ 0x80;
170 signed char ps1 = (signed char) * op1 ^ 0x80;
171 signed char ps0 = (signed char) * op0 ^ 0x80;
172 signed char qs0 = (signed char) * oq0 ^ 0x80;
173 signed char qs1 = (signed char) * oq1 ^ 0x80;
174 signed char qs2 = (signed char) * oq2 ^ 0x80;
176 // add outer taps if we have high edge variance
177 vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
178 vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
181 Filter2 = vp8_filter;
184 // save bottom 3 bits so that we round one side +4 and the other +3
185 Filter1 = vp8_signed_char_clamp(Filter2 + 4);
186 Filter2 = vp8_signed_char_clamp(Filter2 + 3);
189 qs0 = vp8_signed_char_clamp(qs0 - Filter1);
190 ps0 = vp8_signed_char_clamp(ps0 + Filter2);
193 // only apply wider filter if not high edge variance
195 Filter2 = vp8_filter;
197 // roughly 3/7th difference across boundary
198 u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
199 s = vp8_signed_char_clamp(qs0 - u);
201 s = vp8_signed_char_clamp(ps0 + u);
204 // roughly 2/7th difference across boundary
205 u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7);
206 s = vp8_signed_char_clamp(qs1 - u);
208 s = vp8_signed_char_clamp(ps1 + u);
211 // roughly 1/7th difference across boundary
212 u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7);
213 s = vp8_signed_char_clamp(qs2 - u);
215 s = vp8_signed_char_clamp(ps2 + u);
219 void vp8_mbloop_filter_horizontal_edge_c
223 const signed char *flimit,
224 const signed char *limit,
225 const signed char *thresh,
229 signed char hev = 0; // high edge variance
230 signed char mask = 0;
233 // loop filter designed to work using chars so that we can make maximum use
234 // of 8 bit simd instructions.
238 mask = vp8_filter_mask(limit[i], flimit[i],
239 s[-4*p], s[-3*p], s[-2*p], s[-1*p],
240 s[0*p], s[1*p], s[2*p], s[3*p]);
242 hev = vp8_hevmask(thresh[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
244 vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p, s + 2 * p);
248 while (++i < count * 8);
253 void vp8_mbloop_filter_vertical_edge_c
257 const signed char *flimit,
258 const signed char *limit,
259 const signed char *thresh,
263 signed char hev = 0; // high edge variance
264 signed char mask = 0;
270 mask = vp8_filter_mask(limit[i], flimit[i],
271 s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
273 hev = vp8_hevmask(thresh[i], s[-2], s[-1], s[0], s[1]);
275 vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2);
279 while (++i < count * 8);
283 // should we apply any filter at all ( 11111111 yes, 00000000 no)
284 __inline signed char vp8_simple_filter_mask(signed char limit, signed char flimit, uc p1, uc p0, uc q0, uc q1)
286 // Why does this cause problems for win32?
287 // error C2143: syntax error : missing ';' before 'type'
289 #ifndef NEW_LOOPFILTER_MASK
290 signed char mask = (abs(p0 - q0) <= flimit) * -1;
292 signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= flimit * 2 + limit) * -1;
297 __inline void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0, uc *oq1)
299 signed char vp8_filter, Filter1, Filter2;
300 signed char p1 = (signed char) * op1 ^ 0x80;
301 signed char p0 = (signed char) * op0 ^ 0x80;
302 signed char q0 = (signed char) * oq0 ^ 0x80;
303 signed char q1 = (signed char) * oq1 ^ 0x80;
306 vp8_filter = vp8_signed_char_clamp(p1 - q1);
307 vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (q0 - p0));
310 // save bottom 3 bits so that we round one side +4 and the other +3
311 Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
313 u = vp8_signed_char_clamp(q0 - Filter1);
316 Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
318 u = vp8_signed_char_clamp(p0 + Filter2);
322 void vp8_loop_filter_simple_horizontal_edge_c
326 const signed char *flimit,
327 const signed char *limit,
328 const signed char *thresh,
332 signed char mask = 0;
338 //mask = vp8_simple_filter_mask( limit[i], flimit[i],s[-1*p],s[0*p]);
339 mask = vp8_simple_filter_mask(limit[i], flimit[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
340 vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p);
343 while (++i < count * 8);
346 void vp8_loop_filter_simple_vertical_edge_c
350 const signed char *flimit,
351 const signed char *limit,
352 const signed char *thresh,
356 signed char mask = 0;
362 //mask = vp8_simple_filter_mask( limit[i], flimit[i],s[-1],s[0]);
363 mask = vp8_simple_filter_mask(limit[i], flimit[i], s[-2], s[-1], s[0], s[1]);
364 vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
367 while (++i < count * 8);