ffmpeg/libavcodec/mpegvideodsp.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "config.h"
  20 #include "libavutil/attributes.h"
  21 #include "libavutil/common.h"
  22 #include "mpegvideodsp.h"
  23
  24 static void gmc1_c(uint8_t *dst, uint8_t *src, int stride, int h,
  25                    int x16, int y16, int rounder)
  26 {
  27     const int A = (16 - x16) * (16 - y16);
  28     const int B = (x16)      * (16 - y16);
  29     const int C = (16 - x16) * (y16);
  30     const int D = (x16)      * (y16);
  31     int i;
  32
  33     for (i = 0; i < h; i++) {
  34         dst[0] = (A * src[0] + B * src[1] + C * src[stride + 0] + D * src[stride + 1] + rounder) >> 8;
  35         dst[1] = (A * src[1] + B * src[2] + C * src[stride + 1] + D * src[stride + 2] + rounder) >> 8;
  36         dst[2] = (A * src[2] + B * src[3] + C * src[stride + 2] + D * src[stride + 3] + rounder) >> 8;
  37         dst[3] = (A * src[3] + B * src[4] + C * src[stride + 3] + D * src[stride + 4] + rounder) >> 8;
  38         dst[4] = (A * src[4] + B * src[5] + C * src[stride + 4] + D * src[stride + 5] + rounder) >> 8;
  39         dst[5] = (A * src[5] + B * src[6] + C * src[stride + 5] + D * src[stride + 6] + rounder) >> 8;
  40         dst[6] = (A * src[6] + B * src[7] + C * src[stride + 6] + D * src[stride + 7] + rounder) >> 8;
  41         dst[7] = (A * src[7] + B * src[8] + C * src[stride + 7] + D * src[stride + 8] + rounder) >> 8;
  42         dst   += stride;
  43         src   += stride;
  44     }
  45 }
  46
  47 void ff_gmc_c(uint8_t *dst, uint8_t *src, int stride, int h, int ox, int oy,
  48               int dxx, int dxy, int dyx, int dyy, int shift, int r,
  49               int width, int height)
  50 {
  51     int y, vx, vy;
  52     const int s = 1 << shift;
  53
  54     width--;
  55     height--;
  56
  57     for (y = 0; y < h; y++) {
  58         int x;
  59
  60         vx = ox;
  61         vy = oy;
  62         for (x = 0; x < 8; x++) { // FIXME: optimize
  63             int index;
  64             int src_x  = vx >> 16;
  65             int src_y  = vy >> 16;
  66             int frac_x = src_x & (s - 1);
  67             int frac_y = src_y & (s - 1);
  68
  69             src_x >>= shift;
  70             src_y >>= shift;
  71
  72             if ((unsigned) src_x < width) {
  73                 if ((unsigned) src_y < height) {
  74                     index = src_x + src_y * stride;
  75                     dst[y * stride + x] =
  76                         ((src[index]                        * (s - frac_x) +
  77                           src[index + 1]          * frac_x) * (s - frac_y) +
  78                          (src[index + stride]               * (s - frac_x) +
  79                           src[index + stride + 1] * frac_x) *      frac_y  +
  80                          r) >> (shift * 2);
  81                 } else {
  82                     index = src_x + av_clip(src_y, 0, height) * stride;
  83                     dst[y * stride + x] =
  84                         ((src[index]               * (s - frac_x) +
  85                           src[index + 1] * frac_x) *  s           +
  86                          r) >> (shift * 2);
  87                 }
  88             } else {
  89                 if ((unsigned) src_y < height) {
  90                     index = av_clip(src_x, 0, width) + src_y * stride;
  91                     dst[y * stride + x] =
  92                         ((src[index]                    * (s - frac_y) +
  93                           src[index + stride] * frac_y) *  s           +
  94                          r) >> (shift * 2);
  95                 } else {
  96                     index = av_clip(src_x, 0, width) +
  97                             av_clip(src_y, 0, height) * stride;
  98                     dst[y * stride + x] = src[index];
  99                 }
 100             }
 101
 102             vx += dxx;
 103             vy += dyx;
 104         }
 105         ox += dxy;
 106         oy += dyy;
 107     }
 108 }
 109
 110 av_cold void ff_mpegvideodsp_init(MpegVideoDSPContext *c)
 111 {
 112     c->gmc1 = gmc1_c;
 113     c->gmc  = ff_gmc_c;
 114
 115     if (ARCH_PPC)
 116         ff_mpegvideodsp_init_ppc(c);
 117     if (ARCH_X86)
 118         ff_mpegvideodsp_init_x86(c);
 119 }