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      1 /*
      2  *  Copyright 2012 The LibYuv 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 #include <stdio.h>
     12 #include <stdlib.h>
     13 #include <string.h>
     14 #include <time.h>
     15 
     16 #include "libyuv/basic_types.h"
     17 #include "libyuv/compare.h"
     18 #include "libyuv/version.h"
     19 
     20 int main(int argc, char** argv) {
     21   if (argc < 1) {
     22     printf("libyuv compare v%d\n", LIBYUV_VERSION);
     23     printf("compare file1.yuv file2.yuv\n");
     24     return -1;
     25   }
     26   char* name1 = argv[1];
     27   char* name2 = (argc > 2) ? argv[2] : NULL;
     28   FILE* fin1 = fopen(name1, "rb");
     29   FILE* fin2 = name2 ? fopen(name2, "rb") : NULL;
     30 
     31   const int kBlockSize = 32768;
     32   uint8 buf1[kBlockSize];
     33   uint8 buf2[kBlockSize];
     34   uint32 hash1 = 5381;
     35   uint32 hash2 = 5381;
     36   uint64 sum_square_err = 0;
     37   uint64 size_min = 0;
     38   int amt1 = 0;
     39   int amt2 = 0;
     40   do {
     41     amt1 = static_cast<int>(fread(buf1, 1, kBlockSize, fin1));
     42     if (amt1 > 0) hash1 = libyuv::HashDjb2(buf1, amt1, hash1);
     43     if (fin2) {
     44       amt2 = static_cast<int>(fread(buf2, 1, kBlockSize, fin2));
     45       if (amt2 > 0) hash2 = libyuv::HashDjb2(buf2, amt2, hash2);
     46       int amt_min = (amt1 < amt2) ? amt1 : amt2;
     47       size_min += amt_min;
     48       sum_square_err += libyuv::ComputeSumSquareError(buf1, buf2, amt_min);
     49     }
     50   } while (amt1 > 0 || amt2 > 0);
     51 
     52   printf("hash1 %x", hash1);
     53   if (fin2) {
     54     printf(", hash2 %x", hash2);
     55     double mse = static_cast<double>(sum_square_err) /
     56                  static_cast<double>(size_min);
     57     printf(", mse %.2f", mse);
     58     double psnr = libyuv::SumSquareErrorToPsnr(sum_square_err, size_min);
     59     printf(", psnr %.2f\n", psnr);
     60     fclose(fin2);
     61   }
     62   fclose(fin1);
     63 }
     64