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Diffstat (limited to 'libvpx/vp8/encoder/psnr.c')
-rw-r--r-- | libvpx/vp8/encoder/psnr.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/libvpx/vp8/encoder/psnr.c b/libvpx/vp8/encoder/psnr.c new file mode 100644 index 0000000..5bb49ad --- /dev/null +++ b/libvpx/vp8/encoder/psnr.c @@ -0,0 +1,31 @@ +/* + * Copyright (c) 2010 The WebM 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 "vpx_scale/yv12config.h" +#include "math.h" +#include "vp8/common/systemdependent.h" /* for vp8_clear_system_state() */ + +#define MAX_PSNR 60 + +double vp8_mse2psnr(double Samples, double Peak, double Mse) +{ + double psnr; + + if ((double)Mse > 0.0) + psnr = 10.0 * log10(Peak * Peak * Samples / Mse); + else + psnr = MAX_PSNR; /* Limit to prevent / 0 */ + + if (psnr > MAX_PSNR) + psnr = MAX_PSNR; + + return psnr; +} |