libavcodec/binkdsp.c

   1 /*
   2  * Bink DSP routines
   3  * Copyright (c) 2009 Kostya Shishkov
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Bink DSP routines
  25  */
  26
  27 #include "dsputil.h"
  28 #include "binkdsp.h"
  29
  30 #define A1  2896 /* (1/sqrt(2))<<12 */
  31 #define A2  2217
  32 #define A3  3784
  33 #define A4 -5352
  34
  35 #define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\
  36     const int a0 = (src)[s0] + (src)[s4]; \
  37     const int a1 = (src)[s0] - (src)[s4]; \
  38     const int a2 = (src)[s2] + (src)[s6]; \
  39     const int a3 = (A1*((src)[s2] - (src)[s6])) >> 11; \
  40     const int a4 = (src)[s5] + (src)[s3]; \
  41     const int a5 = (src)[s5] - (src)[s3]; \
  42     const int a6 = (src)[s1] + (src)[s7]; \
  43     const int a7 = (src)[s1] - (src)[s7]; \
  44     const int b0 = a4 + a6; \
  45     const int b1 = (A3*(a5 + a7)) >> 11; \
  46     const int b2 = ((A4*a5) >> 11) - b0 + b1; \
  47     const int b3 = (A1*(a6 - a4) >> 11) - b2; \
  48     const int b4 = ((A2*a7) >> 11) + b3 - b1; \
  49     (dest)[d0] = munge(a0+a2   +b0); \
  50     (dest)[d1] = munge(a1+a3-a2+b2); \
  51     (dest)[d2] = munge(a1-a3+a2+b3); \
  52     (dest)[d3] = munge(a0-a2   -b4); \
  53     (dest)[d4] = munge(a0-a2   +b4); \
  54     (dest)[d5] = munge(a1-a3+a2-b3); \
  55     (dest)[d6] = munge(a1+a3-a2-b2); \
  56     (dest)[d7] = munge(a0+a2   -b0); \
  57 }
  58 /* end IDCT_TRANSFORM macro */
  59
  60 #define MUNGE_NONE(x) (x)
  61 #define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src)
  62
  63 #define MUNGE_ROW(x) (((x) + 0x7F)>>8)
  64 #define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_ROW,src)
  65
  66 static inline void bink_idct_col(int *dest, const int32_t *src)
  67 {
  68     if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) {
  69         dest[0]  =
  70         dest[8]  =
  71         dest[16] =
  72         dest[24] =
  73         dest[32] =
  74         dest[40] =
  75         dest[48] =
  76         dest[56] = src[0];
  77     } else {
  78         IDCT_COL(dest, src);
  79     }
  80 }
  81
  82 static void bink_idct_c(int32_t *block)
  83 {
  84     int i;
  85     int temp[64];
  86
  87     for (i = 0; i < 8; i++)
  88         bink_idct_col(&temp[i], &block[i]);
  89     for (i = 0; i < 8; i++) {
  90         IDCT_ROW( (&block[8*i]), (&temp[8*i]) );
  91     }
  92 }
  93
  94 static void bink_idct_add_c(uint8_t *dest, int linesize, int32_t *block)
  95 {
  96     int i, j;
  97
  98     bink_idct_c(block);
  99     for (i = 0; i < 8; i++, dest += linesize, block += 8)
 100         for (j = 0; j < 8; j++)
 101              dest[j] += block[j];
 102 }
 103
 104 static void bink_idct_put_c(uint8_t *dest, int linesize, int32_t *block)
 105 {
 106     int i;
 107     int temp[64];
 108     for (i = 0; i < 8; i++)
 109         bink_idct_col(&temp[i], &block[i]);
 110     for (i = 0; i < 8; i++) {
 111         IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) );
 112     }
 113 }
 114
 115 static void scale_block_c(const uint8_t src[64]/*align 8*/, uint8_t *dst/*align 8*/, int linesize)
 116 {
 117     int i, j;
 118     uint16_t *dst1 = (uint16_t *) dst;
 119     uint16_t *dst2 = (uint16_t *)(dst + linesize);
 120
 121     for (j = 0; j < 8; j++) {
 122         for (i = 0; i < 8; i++) {
 123             dst1[i] = dst2[i] = src[i] * 0x0101;
 124         }
 125         src  += 8;
 126         dst1 += linesize;
 127         dst2 += linesize;
 128     }
 129 }
 130
 131 void ff_binkdsp_init(BinkDSPContext *c)
 132 {
 133     c->idct_add    = bink_idct_add_c;
 134     c->idct_put    = bink_idct_put_c;
 135     c->scale_block = scale_block_c;
 136 }