The Tor Browser: media/libvpx/vp9/encoder/vp9

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*

     2  *  Copyright (c) 2010 The WebM 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  */

    11 #include <math.h>

    13 #include "vpx_scale/yv12config.h"

    15 #define MAX_PSNR 100

    17 double vp9_mse2psnr(double samples, double peak, double mse) {

    18   double psnr;

    20   if (mse > 0.0)

    21     psnr = 10.0 * log10(peak * peak * samples / mse);

    22   else

    23     psnr = MAX_PSNR;  // Limit to prevent / 0

    25   if (psnr > MAX_PSNR)

    26     psnr = MAX_PSNR;

    28   return psnr;

    29 }

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