Adding sse_to_psnr function to tools_common.{h, c}.
Change-Id: Id5f974172416499ff55b0929e315b12d16ff1b1b
diff --git a/tools_common.c b/tools_common.c
index f0e1606..ee337cd 100644
--- a/tools_common.c
+++ b/tools_common.c
@@ -8,13 +8,14 @@
* be found in the AUTHORS file in the root of the source tree.
*/
-#include "tools_common.h"
-
+#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include "./tools_common.h"
+
#if CONFIG_VP8_ENCODER || CONFIG_VP9_ENCODER
#include "vpx/vp8cx.h"
#endif
@@ -273,3 +274,14 @@
return 1;
}
+// TODO(dkovalev) change sse_to_psnr signature: double -> int64_t
+double sse_to_psnr(double samples, double peak, double sse) {
+ static const double kMaxPSNR = 100.0;
+
+ if (sse > 0.0) {
+ const double psnr = 10.0 * log10(samples * peak * peak / sse);
+ return psnr > kMaxPSNR ? kMaxPSNR : psnr;
+ } else {
+ return kMaxPSNR;
+ }
+}
