1 files changed, 64 insertions, 0 deletions
diff --git a/files/util/compare.cc b/files/util/compare.cc
new file mode 100644
index 00000000..f030c799
--- /dev/null
+++ b/files/util/compare.cc
@@ -0,0 +1,64 @@
+/*
+ *  Copyright 2012 The LibYuv Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "libyuv/basic_types.h"
+#include "libyuv/compare.h"
+#include "libyuv/version.h"
+
+int main(int argc, char** argv) {
+  if (argc < 1) {
+    printf("libyuv compare v%d\n", LIBYUV_VERSION);
+    printf("compare file1.yuv file2.yuv\n");
+    return -1;
+  }
+  char* name1 = argv[1];
+  char* name2 = (argc > 2) ? argv[2] : NULL;
+  FILE* fin1 = fopen(name1, "rb");
+  FILE* fin2 = name2 ? fopen(name2, "rb") : NULL;
+
+  const int kBlockSize = 32768;
+  uint8 buf1[kBlockSize];
+  uint8 buf2[kBlockSize];
+  uint32 hash1 = 5381;
+  uint32 hash2 = 5381;
+  uint64 sum_square_err = 0;
+  uint64 size_min = 0;
+  int amt1 = 0;
+  int amt2 = 0;
+  do {
+    amt1 = fread(buf1, 1, kBlockSize, fin1);
+    if (amt1 > 0) hash1 = libyuv::HashDjb2(buf1, amt1, hash1);
+    if (fin2) {
+      amt2 = fread(buf2, 1, kBlockSize, fin2);
+      if (amt2 > 0) hash2 = libyuv::HashDjb2(buf2, amt2, hash2);
+      int amt_min = (amt1 < amt2) ? amt1 : amt2;
+      size_min += amt_min;
+      sum_square_err += libyuv::ComputeSumSquareError(buf1, buf2, amt_min);
+    }
+  } while (amt1 > 0 || amt2 > 0);
+
+  printf("hash1 %x", hash1);
+  if (fin2) {
+    printf(", hash2 %x", hash2);
+    double mse = static_cast<double>(sum_square_err) /
+                 static_cast<double>(size_min);
+    printf(", mse %.2f", mse);
+    double psnr = libyuv::SumSquareErrorToPsnr(sum_square_err, size_min);
+    printf(", psnr %.2f\n", psnr);
+    fclose(fin2);
+  }
+  fclose(fin1);
+}
+