libavfilter/psnr.c

   1 /*
   2  * Copyright (c) 2015 Ronald S. Bultje <rsbultje@gmail.com>
   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 #include "config.h"
  22
  23 #include <stddef.h>
  24 #include <stdint.h>
  25
  26 #include "psnr.h"
  27
  28 static uint64_t sse_line_8bit(const uint8_t *main_line,  const uint8_t *ref_line, int outw)
  29 {
  30     int j;
  31     unsigned m2 = 0;
  32
  33     for (j = 0; j < outw; j++) {
  34         unsigned error = main_line[j] - ref_line[j];
  35
  36         m2 += error * error;
  37     }
  38
  39     return m2;
  40 }
  41
  42 static uint64_t sse_line_16bit(const uint8_t *_main_line, const uint8_t *_ref_line, int outw)
  43 {
  44     int j;
  45     uint64_t m2 = 0;
  46     const uint16_t *main_line = (const uint16_t *) _main_line;
  47     const uint16_t *ref_line = (const uint16_t *) _ref_line;
  48
  49     for (j = 0; j < outw; j++) {
  50         unsigned error = main_line[j] - ref_line[j];
  51
  52         m2 += error * error;
  53     }
  54
  55     return m2;
  56 }
  57
  58 void ff_psnr_init(PSNRDSPContext *dsp, int bpp)
  59 {
  60     dsp->sse_line = bpp > 8 ? sse_line_16bit : sse_line_8bit;
  61 #if ARCH_X86
  62     ff_psnr_init_x86(dsp, bpp);
  63 #endif
  64 }