chromium/third_party/libyuv/source/compare.cc

/*
 *  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.
 */

#include "libyuv/compare.h"

#include <float.h>
#include <math.h>
#ifdef _OPENMP
#include <omp.h>
#endif

#include "libyuv/basic_types.h"
#include "libyuv/compare_row.h"
#include "libyuv/cpu_id.h"
#include "libyuv/row.h"
#include "libyuv/video_common.h"

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

// hash seed of 5381 recommended.
LIBYUV_API
uint32_t HashDjb2(const uint8_t* src, uint64_t count, uint32_t seed) { … }

static uint32_t ARGBDetectRow_C(const uint8_t* argb, int width) { … }

// Scan an opaque argb image and return fourcc based on alpha offset.
// Returns FOURCC_ARGB, FOURCC_BGRA, or 0 if unknown.
LIBYUV_API
uint32_t ARGBDetect(const uint8_t* argb,
                    int stride_argb,
                    int width,
                    int height) { … }

// NEON version accumulates in 16 bit shorts which overflow at 65536 bytes.
// So actual maximum is 1 less loop, which is 64436 - 32 bytes.

LIBYUV_API
uint64_t ComputeHammingDistance(const uint8_t* src_a,
                                const uint8_t* src_b,
                                int count) { … }

// TODO(fbarchard): Refactor into row function.
LIBYUV_API
uint64_t ComputeSumSquareError(const uint8_t* src_a,
                               const uint8_t* src_b,
                               int count) { … }

LIBYUV_API
uint64_t ComputeSumSquareErrorPlane(const uint8_t* src_a,
                                    int stride_a,
                                    const uint8_t* src_b,
                                    int stride_b,
                                    int width,
                                    int height) { … }

LIBYUV_API
double SumSquareErrorToPsnr(uint64_t sse, uint64_t count) { … }

LIBYUV_API
double CalcFramePsnr(const uint8_t* src_a,
                     int stride_a,
                     const uint8_t* src_b,
                     int stride_b,
                     int width,
                     int height) { … }

LIBYUV_API
double I420Psnr(const uint8_t* src_y_a,
                int stride_y_a,
                const uint8_t* src_u_a,
                int stride_u_a,
                const uint8_t* src_v_a,
                int stride_v_a,
                const uint8_t* src_y_b,
                int stride_y_b,
                const uint8_t* src_u_b,
                int stride_u_b,
                const uint8_t* src_v_b,
                int stride_v_b,
                int width,
                int height) { … }

static const int64_t cc1 = …;   // (64^2*(.01*255)^2
static const int64_t cc2 = …;  // (64^2*(.03*255)^2

static double Ssim8x8_C(const uint8_t* src_a,
                        int stride_a,
                        const uint8_t* src_b,
                        int stride_b) { … }

// We are using a 8x8 moving window with starting location of each 8x8 window
// on the 4x4 pixel grid. Such arrangement allows the windows to overlap
// block boundaries to penalize blocking artifacts.
LIBYUV_API
double CalcFrameSsim(const uint8_t* src_a,
                     int stride_a,
                     const uint8_t* src_b,
                     int stride_b,
                     int width,
                     int height) { … }

LIBYUV_API
double I420Ssim(const uint8_t* src_y_a,
                int stride_y_a,
                const uint8_t* src_u_a,
                int stride_u_a,
                const uint8_t* src_v_a,
                int stride_v_a,
                const uint8_t* src_y_b,
                int stride_y_b,
                const uint8_t* src_u_b,
                int stride_u_b,
                const uint8_t* src_v_b,
                int stride_v_b,
                int width,
                int height) { … }

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