compare.h

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/*
 *  Copyright 2011 The LibYuv 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 INCLUDE_LIBYUV_COMPARE_H_
#define INCLUDE_LIBYUV_COMPARE_H_

#include "libyuv/basic_types.h"

#ifdef __cplusplus
namespace libyuv {
extern "C" {
#endif

// Compute a hash for specified memory. Seed of 5381 recommended.
LIBYUV_API
uint32 HashDjb2(const uint8* src, uint64 count, uint32 seed);

// Scan an opaque argb image and return fourcc based on alpha offset.
// Returns FOURCC_ARGB, FOURCC_BGRA, or 0 if unknown.
LIBYUV_API
uint32 ARGBDetect(const uint8* argb, int stride_argb, int width, int height);

// Sum Square Error - used to compute Mean Square Error or PSNR.
LIBYUV_API
uint64 ComputeSumSquareError(const uint8* src_a,
                             const uint8* src_b, int count);

LIBYUV_API
uint64 ComputeSumSquareErrorPlane(const uint8* src_a, int stride_a,
                                  const uint8* src_b, int stride_b,
                                  int width, int height);

static const int kMaxPsnr = 128;

LIBYUV_API
double SumSquareErrorToPsnr(uint64 sse, uint64 count);

LIBYUV_API
double CalcFramePsnr(const uint8* src_a, int stride_a,
                     const uint8* src_b, int stride_b,
                     int width, int height);

LIBYUV_API
double I420Psnr(const uint8* src_y_a, int stride_y_a,
                const uint8* src_u_a, int stride_u_a,
                const uint8* src_v_a, int stride_v_a,
                const uint8* src_y_b, int stride_y_b,
                const uint8* src_u_b, int stride_u_b,
                const uint8* src_v_b, int stride_v_b,
                int width, int height);

LIBYUV_API
double CalcFrameSsim(const uint8* src_a, int stride_a,
                     const uint8* src_b, int stride_b,
                     int width, int height);

LIBYUV_API
double I420Ssim(const uint8* src_y_a, int stride_y_a,
                const uint8* src_u_a, int stride_u_a,
                const uint8* src_v_a, int stride_v_a,
                const uint8* src_y_b, int stride_y_b,
                const uint8* src_u_b, int stride_u_b,
                const uint8* src_v_b, int stride_v_b,
                int width, int height);

#ifdef __cplusplus
}  // extern "C"
}  // namespace libyuv
#endif

#endif  // INCLUDE_LIBYUV_COMPARE_H_