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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_DSP_SSIM_H_
+#define AOM_DSP_SSIM_H_
+
+#define MAX_SSIM_DB 100.0;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "./aom_config.h"
+#include "aom_scale/yv12config.h"
+
+// metrics used for calculating ssim, ssim2, dssim, and ssimc
+typedef struct {
+ // source sum ( over 8x8 region )
+ uint32_t sum_s;
+
+ // reference sum (over 8x8 region )
+ uint32_t sum_r;
+
+ // source sum squared ( over 8x8 region )
+ uint32_t sum_sq_s;
+
+ // reference sum squared (over 8x8 region )
+ uint32_t sum_sq_r;
+
+ // sum of source times reference (over 8x8 region)
+ uint32_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 aom_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 aom_calc_ssim(const YV12_BUFFER_CONFIG *source,
+ const YV12_BUFFER_CONFIG *dest, double *weight);
+
+double aom_calc_fastssim(const YV12_BUFFER_CONFIG *source,
+ const YV12_BUFFER_CONFIG *dest, double *ssim_y,
+ double *ssim_u, double *ssim_v, uint32_t bd,
+ uint32_t in_bd);
+
+#if CONFIG_HIGHBITDEPTH
+double aom_highbd_calc_ssim(const YV12_BUFFER_CONFIG *source,
+ const YV12_BUFFER_CONFIG *dest, double *weight,
+ uint32_t bd, uint32_t in_bd);
+#endif // CONFIG_HIGHBITDEPTH
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_DSP_SSIM_H_