libavcodec/vp3dsp.c

   1 /*
   2  * Copyright (C) 2004 the ffmpeg project
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file vp3dsp.c
  23  * Standard C DSP-oriented functions cribbed from the original VP3
  24  * source code.
  25  */
  26
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29
  30 #define IdctAdjustBeforeShift 8
  31 #define xC1S7 64277
  32 #define xC2S6 60547
  33 #define xC3S5 54491
  34 #define xC4S4 46341
  35 #define xC5S3 36410
  36 #define xC6S2 25080
  37 #define xC7S1 12785
  38
  39 #define M(a,b) (((a) * (b))>>16)
  40
  41 static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)
  42 {
  43     int16_t *ip = input;
  44     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
  45
  46     int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
  47     int Ed, Gd, Add, Bdd, Fd, Hd;
  48
  49     int i;
  50
  51     /* Inverse DCT on the rows now */
  52     for (i = 0; i < 8; i++) {
  53         /* Check for non-zero values */
  54         if ( ip[0] | ip[1] | ip[2] | ip[3] | ip[4] | ip[5] | ip[6] | ip[7] ) {
  55             A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);
  56             B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);
  57             C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);
  58             D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);
  59
  60             Ad = M(xC4S4, (A - C));
  61             Bd = M(xC4S4, (B - D));
  62
  63             Cd = A + C;
  64             Dd = B + D;
  65
  66             E = M(xC4S4, (ip[0] + ip[4]));
  67             F = M(xC4S4, (ip[0] - ip[4]));
  68
  69             G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);
  70             H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);
  71
  72             Ed = E - G;
  73             Gd = E + G;
  74
  75             Add = F + Ad;
  76             Bdd = Bd - H;
  77
  78             Fd = F - Ad;
  79             Hd = Bd + H;
  80
  81             /*  Final sequence of operations over-write original inputs. */
  82             ip[0] = Gd + Cd ;
  83             ip[7] = Gd - Cd ;
  84
  85             ip[1] = Add + Hd;
  86             ip[2] = Add - Hd;
  87
  88             ip[3] = Ed + Dd ;
  89             ip[4] = Ed - Dd ;
  90
  91             ip[5] = Fd + Bdd;
  92             ip[6] = Fd - Bdd;
  93         }
  94
  95         ip += 8;            /* next row */
  96     }
  97
  98     ip = input;
  99
 100     for ( i = 0; i < 8; i++) {
 101         /* Check for non-zero values (bitwise or faster than ||) */
 102         if ( ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
 103              ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
 104
 105             A = M(xC1S7, ip[1*8]) + M(xC7S1, ip[7*8]);
 106             B = M(xC7S1, ip[1*8]) - M(xC1S7, ip[7*8]);
 107             C = M(xC3S5, ip[3*8]) + M(xC5S3, ip[5*8]);
 108             D = M(xC3S5, ip[5*8]) - M(xC5S3, ip[3*8]);
 109
 110             Ad = M(xC4S4, (A - C));
 111             Bd = M(xC4S4, (B - D));
 112
 113             Cd = A + C;
 114             Dd = B + D;
 115
 116             E = M(xC4S4, (ip[0*8] + ip[4*8])) + 8;
 117             F = M(xC4S4, (ip[0*8] - ip[4*8])) + 8;
 118
 119             if(type==1){  //HACK
 120                 E += 16*128;
 121                 F += 16*128;
 122             }
 123
 124             G = M(xC2S6, ip[2*8]) + M(xC6S2, ip[6*8]);
 125             H = M(xC6S2, ip[2*8]) - M(xC2S6, ip[6*8]);
 126
 127             Ed = E - G;
 128             Gd = E + G;
 129
 130             Add = F + Ad;
 131             Bdd = Bd - H;
 132
 133             Fd = F - Ad;
 134             Hd = Bd + H;
 135
 136             /* Final sequence of operations over-write original inputs. */
 137             if(type==0){
 138                 ip[0*8] = (Gd + Cd )  >> 4;
 139                 ip[7*8] = (Gd - Cd )  >> 4;
 140
 141                 ip[1*8] = (Add + Hd ) >> 4;
 142                 ip[2*8] = (Add - Hd ) >> 4;
 143
 144                 ip[3*8] = (Ed + Dd )  >> 4;
 145                 ip[4*8] = (Ed - Dd )  >> 4;
 146
 147                 ip[5*8] = (Fd + Bdd ) >> 4;
 148                 ip[6*8] = (Fd - Bdd ) >> 4;
 149             }else if(type==1){
 150                 dst[0*stride] = cm[(Gd + Cd )  >> 4];
 151                 dst[7*stride] = cm[(Gd - Cd )  >> 4];
 152
 153                 dst[1*stride] = cm[(Add + Hd ) >> 4];
 154                 dst[2*stride] = cm[(Add - Hd ) >> 4];
 155
 156                 dst[3*stride] = cm[(Ed + Dd )  >> 4];
 157                 dst[4*stride] = cm[(Ed - Dd )  >> 4];
 158
 159                 dst[5*stride] = cm[(Fd + Bdd ) >> 4];
 160                 dst[6*stride] = cm[(Fd - Bdd ) >> 4];
 161             }else{
 162                 dst[0*stride] = cm[dst[0*stride] + ((Gd + Cd )  >> 4)];
 163                 dst[7*stride] = cm[dst[7*stride] + ((Gd - Cd )  >> 4)];
 164
 165                 dst[1*stride] = cm[dst[1*stride] + ((Add + Hd ) >> 4)];
 166                 dst[2*stride] = cm[dst[2*stride] + ((Add - Hd ) >> 4)];
 167
 168                 dst[3*stride] = cm[dst[3*stride] + ((Ed + Dd )  >> 4)];
 169                 dst[4*stride] = cm[dst[4*stride] + ((Ed - Dd )  >> 4)];
 170
 171                 dst[5*stride] = cm[dst[5*stride] + ((Fd + Bdd ) >> 4)];
 172                 dst[6*stride] = cm[dst[6*stride] + ((Fd - Bdd ) >> 4)];
 173             }
 174
 175         } else {
 176             if(type==0){
 177                 ip[0*8] =
 178                 ip[1*8] =
 179                 ip[2*8] =
 180                 ip[3*8] =
 181                 ip[4*8] =
 182                 ip[5*8] =
 183                 ip[6*8] =
 184                 ip[7*8] = ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
 185             }else if(type==1){
 186                 dst[0*stride]=
 187                 dst[1*stride]=
 188                 dst[2*stride]=
 189                 dst[3*stride]=
 190                 dst[4*stride]=
 191                 dst[5*stride]=
 192                 dst[6*stride]=
 193                 dst[7*stride]= 128 + ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
 194             }else{
 195                 if(ip[0*8]){
 196                     int v= ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
 197                     dst[0*stride] = cm[dst[0*stride] + v];
 198                     dst[1*stride] = cm[dst[1*stride] + v];
 199                     dst[2*stride] = cm[dst[2*stride] + v];
 200                     dst[3*stride] = cm[dst[3*stride] + v];
 201                     dst[4*stride] = cm[dst[4*stride] + v];
 202                     dst[5*stride] = cm[dst[5*stride] + v];
 203                     dst[6*stride] = cm[dst[6*stride] + v];
 204                     dst[7*stride] = cm[dst[7*stride] + v];
 205                 }
 206             }
 207         }
 208
 209         ip++;            /* next column */
 210         dst++;
 211     }
 212 }
 213
 214 void ff_vp3_idct_c(DCTELEM *block/* align 16*/){
 215     idct(NULL, 0, block, 0);
 216 }
 217
 218 void ff_vp3_idct_put_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/){
 219     idct(dest, line_size, block, 1);
 220 }
 221
 222 void ff_vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/){
 223     idct(dest, line_size, block, 2);
 224 }