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+/*
+ * Copyright (c) 2014 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.
+ */
+
+#ifndef VP9_ENCODER_VP9_SSIM_H_
+#define VP9_ENCODER_VP9_SSIM_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "vpx_scale/yv12config.h"
+
+// metrics used for calculating ssim, ssim2, dssim, and ssimc
+typedef struct {
+ // source sum ( over 8x8 region )
+ uint64_t sum_s;
+
+ // reference sum (over 8x8 region )
+ uint64_t sum_r;
+
+ // source sum squared ( over 8x8 region )
+ uint64_t sum_sq_s;
+
+ // reference sum squared (over 8x8 region )
+ uint64_t sum_sq_r;
+
+ // sum of source times reference (over 8x8 region)
+ uint64_t sum_sxr;
+
+ // calculated ssim score between source and reference
+ double ssim;
+} Ssimv;
+
+// metrics collected on a frame basis
+typedef struct {
+ // ssim consistency error metric ( see code for explanation )
+ double ssimc;
+
+ // standard ssim
+ double ssim;
+
+ // revised ssim ( see code for explanation)
+ double ssim2;
+
+ // ssim restated as an error metric like sse
+ double dssim;
+
+ // dssim converted to decibels
+ double dssimd;
+
+ // ssimc converted to decibels
+ double ssimcd;
+} Metrics;
+
+double vp9_get_ssim_metrics(uint8_t *img1, int img1_pitch, uint8_t *img2,
+ int img2_pitch, int width, int height, Ssimv *sv2,
+ Metrics *m, int do_inconsistency);
+
+double vp9_calc_ssim(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest,
+ double *weight);
+
+double vp9_calc_ssimg(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest,
+ double *ssim_y, double *ssim_u, double *ssim_v);
+
+double vp9_calc_fastssim(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest,
+ double *ssim_y, double *ssim_u, double *ssim_v);
+
+double vp9_psnrhvs(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest,
+ double *ssim_y, double *ssim_u, double *ssim_v);
+
+#if CONFIG_VP9_HIGHBITDEPTH
+double vp9_highbd_calc_ssim(YV12_BUFFER_CONFIG *source,
+ YV12_BUFFER_CONFIG *dest,
+ double *weight,
+ unsigned int bd);
+
+double vp9_highbd_calc_ssimg(YV12_BUFFER_CONFIG *source,
+ YV12_BUFFER_CONFIG *dest,
+ double *ssim_y,
+ double *ssim_u,
+ double *ssim_v,
+ unsigned int bd);
+#endif // CONFIG_VP9_HIGHBITDEPTH
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VP9_ENCODER_VP9_SSIM_H_