LCOV - code coverage report
Current view: directory - media/libvpx/vp8/common - loopfilter_filters.c (source / functions) Found Hit Coverage
Test: app.info Lines: 164 0 0.0 %
Date: 2012-06-02 Functions: 13 0 0.0 %

       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                 : 
      12                 : #include <stdlib.h>
      13                 : #include "loopfilter.h"
      14                 : #include "onyxc_int.h"
      15                 : 
      16                 : #ifdef __SUNPRO_C
      17                 : #define __inline inline
      18                 : #endif
      19                 : 
      20                 : typedef unsigned char uc;
      21                 : 
      22               0 : static __inline signed char vp8_signed_char_clamp(int t)
      23                 : {
      24               0 :     t = (t < -128 ? -128 : t);
      25               0 :     t = (t > 127 ? 127 : t);
      26               0 :     return (signed char) t;
      27                 : }
      28                 : 
      29                 : 
      30                 : /* should we apply any filter at all ( 11111111 yes, 00000000 no) */
      31               0 : static __inline signed char vp8_filter_mask(uc limit, uc blimit,
      32                 :                                      uc p3, uc p2, uc p1, uc p0,
      33                 :                                      uc q0, uc q1, uc q2, uc q3)
      34                 : {
      35               0 :     signed char mask = 0;
      36               0 :     mask |= (abs(p3 - p2) > limit) * -1;
      37               0 :     mask |= (abs(p2 - p1) > limit) * -1;
      38               0 :     mask |= (abs(p1 - p0) > limit) * -1;
      39               0 :     mask |= (abs(q1 - q0) > limit) * -1;
      40               0 :     mask |= (abs(q2 - q1) > limit) * -1;
      41               0 :     mask |= (abs(q3 - q2) > limit) * -1;
      42               0 :     mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2  > blimit) * -1;
      43               0 :     mask = ~mask;
      44               0 :     return mask;
      45                 : }
      46                 : 
      47                 : /* is there high variance internal edge ( 11111111 yes, 00000000 no) */
      48               0 : static __inline signed char vp8_hevmask(uc thresh, uc p1, uc p0, uc q0, uc q1)
      49                 : {
      50               0 :     signed char hev = 0;
      51               0 :     hev  |= (abs(p1 - p0) > thresh) * -1;
      52               0 :     hev  |= (abs(q1 - q0) > thresh) * -1;
      53               0 :     return hev;
      54                 : }
      55                 : 
      56               0 : static __inline void vp8_filter(signed char mask, uc hev, uc *op1,
      57                 :         uc *op0, uc *oq0, uc *oq1)
      58                 : 
      59                 : {
      60                 :     signed char ps0, qs0;
      61                 :     signed char ps1, qs1;
      62                 :     signed char vp8_filter, Filter1, Filter2;
      63                 :     signed char u;
      64                 : 
      65               0 :     ps1 = (signed char) * op1 ^ 0x80;
      66               0 :     ps0 = (signed char) * op0 ^ 0x80;
      67               0 :     qs0 = (signed char) * oq0 ^ 0x80;
      68               0 :     qs1 = (signed char) * oq1 ^ 0x80;
      69                 : 
      70                 :     /* add outer taps if we have high edge variance */
      71               0 :     vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
      72               0 :     vp8_filter &= hev;
      73                 : 
      74                 :     /* inner taps */
      75               0 :     vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
      76               0 :     vp8_filter &= mask;
      77                 : 
      78                 :     /* save bottom 3 bits so that we round one side +4 and the other +3
      79                 :      * if it equals 4 we'll set to adjust by -1 to account for the fact
      80                 :      * we'd round 3 the other way
      81                 :      */
      82               0 :     Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
      83               0 :     Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
      84               0 :     Filter1 >>= 3;
      85               0 :     Filter2 >>= 3;
      86               0 :     u = vp8_signed_char_clamp(qs0 - Filter1);
      87               0 :     *oq0 = u ^ 0x80;
      88               0 :     u = vp8_signed_char_clamp(ps0 + Filter2);
      89               0 :     *op0 = u ^ 0x80;
      90               0 :     vp8_filter = Filter1;
      91                 : 
      92                 :     /* outer tap adjustments */
      93               0 :     vp8_filter += 1;
      94               0 :     vp8_filter >>= 1;
      95               0 :     vp8_filter &= ~hev;
      96                 : 
      97               0 :     u = vp8_signed_char_clamp(qs1 - vp8_filter);
      98               0 :     *oq1 = u ^ 0x80;
      99               0 :     u = vp8_signed_char_clamp(ps1 + vp8_filter);
     100               0 :     *op1 = u ^ 0x80;
     101                 : 
     102               0 : }
     103               0 : void vp8_loop_filter_horizontal_edge_c
     104                 : (
     105                 :     unsigned char *s,
     106                 :     int p, /* pitch */
     107                 :     const unsigned char *blimit,
     108                 :     const unsigned char *limit,
     109                 :     const unsigned char *thresh,
     110                 :     int count
     111                 : )
     112                 : {
     113               0 :     int  hev = 0; /* high edge variance */
     114               0 :     signed char mask = 0;
     115               0 :     int i = 0;
     116                 : 
     117                 :     /* loop filter designed to work using chars so that we can make maximum use
     118                 :      * of 8 bit simd instructions.
     119                 :      */
     120                 :     do
     121                 :     {
     122               0 :         mask = vp8_filter_mask(limit[0], blimit[0],
     123               0 :                                s[-4*p], s[-3*p], s[-2*p], s[-1*p],
     124               0 :                                s[0*p], s[1*p], s[2*p], s[3*p]);
     125                 : 
     126               0 :         hev = vp8_hevmask(thresh[0], s[-2*p], s[-1*p], s[0*p], s[1*p]);
     127                 : 
     128               0 :         vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
     129                 : 
     130               0 :         ++s;
     131                 :     }
     132               0 :     while (++i < count * 8);
     133               0 : }
     134                 : 
     135               0 : void vp8_loop_filter_vertical_edge_c
     136                 : (
     137                 :     unsigned char *s,
     138                 :     int p,
     139                 :     const unsigned char *blimit,
     140                 :     const unsigned char *limit,
     141                 :     const unsigned char *thresh,
     142                 :     int count
     143                 : )
     144                 : {
     145               0 :     int  hev = 0; /* high edge variance */
     146               0 :     signed char mask = 0;
     147               0 :     int i = 0;
     148                 : 
     149                 :     /* loop filter designed to work using chars so that we can make maximum use
     150                 :      * of 8 bit simd instructions.
     151                 :      */
     152                 :     do
     153                 :     {
     154               0 :         mask = vp8_filter_mask(limit[0], blimit[0],
     155               0 :                                s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
     156                 : 
     157               0 :         hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
     158                 : 
     159               0 :         vp8_filter(mask, hev, s - 2, s - 1, s, s + 1);
     160                 : 
     161               0 :         s += p;
     162                 :     }
     163               0 :     while (++i < count * 8);
     164               0 : }
     165                 : 
     166               0 : static __inline void vp8_mbfilter(signed char mask, uc hev,
     167                 :                            uc *op2, uc *op1, uc *op0, uc *oq0, uc *oq1, uc *oq2)
     168                 : {
     169                 :     signed char s, u;
     170                 :     signed char vp8_filter, Filter1, Filter2;
     171               0 :     signed char ps2 = (signed char) * op2 ^ 0x80;
     172               0 :     signed char ps1 = (signed char) * op1 ^ 0x80;
     173               0 :     signed char ps0 = (signed char) * op0 ^ 0x80;
     174               0 :     signed char qs0 = (signed char) * oq0 ^ 0x80;
     175               0 :     signed char qs1 = (signed char) * oq1 ^ 0x80;
     176               0 :     signed char qs2 = (signed char) * oq2 ^ 0x80;
     177                 : 
     178                 :     /* add outer taps if we have high edge variance */
     179               0 :     vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
     180               0 :     vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
     181               0 :     vp8_filter &= mask;
     182                 : 
     183               0 :     Filter2 = vp8_filter;
     184               0 :     Filter2 &= hev;
     185                 : 
     186                 :     /* save bottom 3 bits so that we round one side +4 and the other +3 */
     187               0 :     Filter1 = vp8_signed_char_clamp(Filter2 + 4);
     188               0 :     Filter2 = vp8_signed_char_clamp(Filter2 + 3);
     189               0 :     Filter1 >>= 3;
     190               0 :     Filter2 >>= 3;
     191               0 :     qs0 = vp8_signed_char_clamp(qs0 - Filter1);
     192               0 :     ps0 = vp8_signed_char_clamp(ps0 + Filter2);
     193                 : 
     194                 : 
     195                 :     /* only apply wider filter if not high edge variance */
     196               0 :     vp8_filter &= ~hev;
     197               0 :     Filter2 = vp8_filter;
     198                 : 
     199                 :     /* roughly 3/7th difference across boundary */
     200               0 :     u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
     201               0 :     s = vp8_signed_char_clamp(qs0 - u);
     202               0 :     *oq0 = s ^ 0x80;
     203               0 :     s = vp8_signed_char_clamp(ps0 + u);
     204               0 :     *op0 = s ^ 0x80;
     205                 : 
     206                 :     /* roughly 2/7th difference across boundary */
     207               0 :     u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7);
     208               0 :     s = vp8_signed_char_clamp(qs1 - u);
     209               0 :     *oq1 = s ^ 0x80;
     210               0 :     s = vp8_signed_char_clamp(ps1 + u);
     211               0 :     *op1 = s ^ 0x80;
     212                 : 
     213                 :     /* roughly 1/7th difference across boundary */
     214               0 :     u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7);
     215               0 :     s = vp8_signed_char_clamp(qs2 - u);
     216               0 :     *oq2 = s ^ 0x80;
     217               0 :     s = vp8_signed_char_clamp(ps2 + u);
     218               0 :     *op2 = s ^ 0x80;
     219               0 : }
     220                 : 
     221               0 : void vp8_mbloop_filter_horizontal_edge_c
     222                 : (
     223                 :     unsigned char *s,
     224                 :     int p,
     225                 :     const unsigned char *blimit,
     226                 :     const unsigned char *limit,
     227                 :     const unsigned char *thresh,
     228                 :     int count
     229                 : )
     230                 : {
     231               0 :     signed char hev = 0; /* high edge variance */
     232               0 :     signed char mask = 0;
     233               0 :     int i = 0;
     234                 : 
     235                 :     /* loop filter designed to work using chars so that we can make maximum use
     236                 :      * of 8 bit simd instructions.
     237                 :      */
     238                 :     do
     239                 :     {
     240                 : 
     241               0 :         mask = vp8_filter_mask(limit[0], blimit[0],
     242               0 :                                s[-4*p], s[-3*p], s[-2*p], s[-1*p],
     243               0 :                                s[0*p], s[1*p], s[2*p], s[3*p]);
     244                 : 
     245               0 :         hev = vp8_hevmask(thresh[0], s[-2*p], s[-1*p], s[0*p], s[1*p]);
     246                 : 
     247               0 :         vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p, s + 2 * p);
     248                 : 
     249               0 :         ++s;
     250                 :     }
     251               0 :     while (++i < count * 8);
     252                 : 
     253               0 : }
     254                 : 
     255                 : 
     256               0 : void vp8_mbloop_filter_vertical_edge_c
     257                 : (
     258                 :     unsigned char *s,
     259                 :     int p,
     260                 :     const unsigned char *blimit,
     261                 :     const unsigned char *limit,
     262                 :     const unsigned char *thresh,
     263                 :     int count
     264                 : )
     265                 : {
     266               0 :     signed char hev = 0; /* high edge variance */
     267               0 :     signed char mask = 0;
     268               0 :     int i = 0;
     269                 : 
     270                 :     do
     271                 :     {
     272                 : 
     273               0 :         mask = vp8_filter_mask(limit[0], blimit[0],
     274               0 :                                s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
     275                 : 
     276               0 :         hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
     277                 : 
     278               0 :         vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2);
     279                 : 
     280               0 :         s += p;
     281                 :     }
     282               0 :     while (++i < count * 8);
     283                 : 
     284               0 : }
     285                 : 
     286                 : /* should we apply any filter at all ( 11111111 yes, 00000000 no) */
     287               0 : static __inline signed char vp8_simple_filter_mask(uc blimit, uc p1, uc p0, uc q0, uc q1)
     288                 : {
     289                 : /* Why does this cause problems for win32?
     290                 :  * error C2143: syntax error : missing ';' before 'type'
     291                 :  *  (void) limit;
     292                 :  */
     293               0 :     signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2  <= blimit) * -1;
     294               0 :     return mask;
     295                 : }
     296                 : 
     297               0 : static __inline void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0, uc *oq1)
     298                 : {
     299                 :     signed char vp8_filter, Filter1, Filter2;
     300               0 :     signed char p1 = (signed char) * op1 ^ 0x80;
     301               0 :     signed char p0 = (signed char) * op0 ^ 0x80;
     302               0 :     signed char q0 = (signed char) * oq0 ^ 0x80;
     303               0 :     signed char q1 = (signed char) * oq1 ^ 0x80;
     304                 :     signed char u;
     305                 : 
     306               0 :     vp8_filter = vp8_signed_char_clamp(p1 - q1);
     307               0 :     vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (q0 - p0));
     308               0 :     vp8_filter &= mask;
     309                 : 
     310                 :     /* save bottom 3 bits so that we round one side +4 and the other +3 */
     311               0 :     Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
     312               0 :     Filter1 >>= 3;
     313               0 :     u = vp8_signed_char_clamp(q0 - Filter1);
     314               0 :     *oq0  = u ^ 0x80;
     315                 : 
     316               0 :     Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
     317               0 :     Filter2 >>= 3;
     318               0 :     u = vp8_signed_char_clamp(p0 + Filter2);
     319               0 :     *op0 = u ^ 0x80;
     320               0 : }
     321                 : 
     322               0 : void vp8_loop_filter_simple_horizontal_edge_c
     323                 : (
     324                 :     unsigned char *s,
     325                 :     int p,
     326                 :     const unsigned char *blimit
     327                 : )
     328                 : {
     329               0 :     signed char mask = 0;
     330               0 :     int i = 0;
     331                 : 
     332                 :     do
     333                 :     {
     334               0 :         mask = vp8_simple_filter_mask(blimit[0], s[-2*p], s[-1*p], s[0*p], s[1*p]);
     335               0 :         vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p);
     336               0 :         ++s;
     337                 :     }
     338               0 :     while (++i < 16);
     339               0 : }
     340                 : 
     341               0 : void vp8_loop_filter_simple_vertical_edge_c
     342                 : (
     343                 :     unsigned char *s,
     344                 :     int p,
     345                 :     const unsigned char *blimit
     346                 : )
     347                 : {
     348               0 :     signed char mask = 0;
     349               0 :     int i = 0;
     350                 : 
     351                 :     do
     352                 :     {
     353               0 :         mask = vp8_simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]);
     354               0 :         vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
     355               0 :         s += p;
     356                 :     }
     357               0 :     while (++i < 16);
     358                 : 
     359               0 : }

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