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Disallow the comparison between videos with different bit depth

Change-Id: I1fd8e991f2440925e989d8e7ab33fdf5f6b1d36b

--- a/tools/tiny_ssim.c

+++ b/tools/tiny_ssim.c

@@ -629,6 +629,15 @@

     goto clean_up;

   }

+  if (in[0].bit_depth != in[1].bit_depth) {

+    fprintf(stderr,

+            "Failing: Image bit depths don't match or are unspecified!\n");

+    return_value = 1;

+    goto clean_up;

+  }

+

+  bit_depth = in[0].bit_depth;

+

   // Number of frames to skip from file1.yuv for every frame used. Normal

   // values 0, 1 and 3 correspond to TL2, TL1 and TL0 respectively for a 3TL

   // encoding in mode 10. 7 would be reasonable for comparing TL0 of a 4-layer