326 lines
10 KiB
C++
326 lines
10 KiB
C++
/*
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* Copyright 2011 The LibYuv Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "libyuv/compare.h"
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#include <float.h>
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#include <math.h>
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#ifdef _OPENMP
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#include <omp.h>
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#endif
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#include "libyuv/basic_types.h"
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#include "libyuv/cpu_id.h"
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#include "libyuv/row.h"
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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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// hash seed of 5381 recommended.
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// Internal C version of HashDjb2 with int sized count for efficiency.
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uint32 HashDjb2_C(const uint8* src, int count, uint32 seed);
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// This module is for Visual C x86
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#if !defined(LIBYUV_DISABLE_X86) && \
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(defined(_M_IX86) || \
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(defined(__x86_64__) || (defined(__i386__) && !defined(__pic__))))
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#define HAS_HASHDJB2_SSE41
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uint32 HashDjb2_SSE41(const uint8* src, int count, uint32 seed);
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#if _MSC_VER >= 1700
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#define HAS_HASHDJB2_AVX2
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uint32 HashDjb2_AVX2(const uint8* src, int count, uint32 seed);
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#endif
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#endif // HAS_HASHDJB2_SSE41
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// hash seed of 5381 recommended.
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LIBYUV_API
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uint32 HashDjb2(const uint8* src, uint64 count, uint32 seed) {
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const int kBlockSize = 1 << 15; // 32768;
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int remainder;
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uint32 (*HashDjb2_SSE)(const uint8* src, int count, uint32 seed) = HashDjb2_C;
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#if defined(HAS_HASHDJB2_SSE41)
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if (TestCpuFlag(kCpuHasSSE41)) {
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HashDjb2_SSE = HashDjb2_SSE41;
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}
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#endif
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#if defined(HAS_HASHDJB2_AVX2)
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if (TestCpuFlag(kCpuHasAVX2)) {
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HashDjb2_SSE = HashDjb2_AVX2;
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}
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#endif
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while (count >= (uint64)(kBlockSize)) {
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seed = HashDjb2_SSE(src, kBlockSize, seed);
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src += kBlockSize;
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count -= kBlockSize;
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}
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remainder = (int)(count) & ~15;
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if (remainder) {
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seed = HashDjb2_SSE(src, remainder, seed);
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src += remainder;
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count -= remainder;
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}
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remainder = (int)(count) & 15;
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if (remainder) {
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seed = HashDjb2_C(src, remainder, seed);
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}
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return seed;
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}
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uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count);
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#if !defined(LIBYUV_DISABLE_NEON) && \
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(defined(__ARM_NEON__) || defined(LIBYUV_NEON) || defined(__aarch64__))
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#define HAS_SUMSQUAREERROR_NEON
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uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count);
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#endif
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#if !defined(LIBYUV_DISABLE_X86) && \
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(defined(_M_IX86) || defined(__x86_64__) || defined(__i386__))
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#define HAS_SUMSQUAREERROR_SSE2
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uint32 SumSquareError_SSE2(const uint8* src_a, const uint8* src_b, int count);
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#endif
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// Visual C 2012 required for AVX2.
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#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && _MSC_VER >= 1700
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#define HAS_SUMSQUAREERROR_AVX2
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uint32 SumSquareError_AVX2(const uint8* src_a, const uint8* src_b, int count);
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#endif
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// TODO(fbarchard): Refactor into row function.
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LIBYUV_API
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uint64 ComputeSumSquareError(const uint8* src_a, const uint8* src_b,
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int count) {
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// SumSquareError returns values 0 to 65535 for each squared difference.
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// Up to 65536 of those can be summed and remain within a uint32.
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// After each block of 65536 pixels, accumulate into a uint64.
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const int kBlockSize = 65536;
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int remainder = count & (kBlockSize - 1) & ~31;
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uint64 sse = 0;
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int i;
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uint32 (*SumSquareError)(const uint8* src_a, const uint8* src_b, int count) =
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SumSquareError_C;
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#if defined(HAS_SUMSQUAREERROR_NEON)
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if (TestCpuFlag(kCpuHasNEON)) {
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SumSquareError = SumSquareError_NEON;
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}
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#endif
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#if defined(HAS_SUMSQUAREERROR_SSE2)
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if (TestCpuFlag(kCpuHasSSE2) &&
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IS_ALIGNED(src_a, 16) && IS_ALIGNED(src_b, 16)) {
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// Note only used for multiples of 16 so count is not checked.
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SumSquareError = SumSquareError_SSE2;
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}
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#endif
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#if defined(HAS_SUMSQUAREERROR_AVX2)
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if (TestCpuFlag(kCpuHasAVX2)) {
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// Note only used for multiples of 32 so count is not checked.
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SumSquareError = SumSquareError_AVX2;
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}
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#endif
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#ifdef _OPENMP
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#pragma omp parallel for reduction(+: sse)
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#endif
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for (i = 0; i < (count - (kBlockSize - 1)); i += kBlockSize) {
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sse += SumSquareError(src_a + i, src_b + i, kBlockSize);
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}
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src_a += count & ~(kBlockSize - 1);
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src_b += count & ~(kBlockSize - 1);
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if (remainder) {
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sse += SumSquareError(src_a, src_b, remainder);
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src_a += remainder;
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src_b += remainder;
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}
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remainder = count & 31;
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if (remainder) {
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sse += SumSquareError_C(src_a, src_b, remainder);
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}
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return sse;
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}
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LIBYUV_API
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uint64 ComputeSumSquareErrorPlane(const uint8* src_a, int stride_a,
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const uint8* src_b, int stride_b,
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int width, int height) {
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uint64 sse = 0;
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int h;
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// Coalesce rows.
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if (stride_a == width &&
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stride_b == width) {
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width *= height;
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height = 1;
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stride_a = stride_b = 0;
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}
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for (h = 0; h < height; ++h) {
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sse += ComputeSumSquareError(src_a, src_b, width);
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src_a += stride_a;
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src_b += stride_b;
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}
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return sse;
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}
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LIBYUV_API
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double SumSquareErrorToPsnr(uint64 sse, uint64 count) {
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double psnr;
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if (sse > 0) {
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double mse = (double)(count) / (double)(sse);
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psnr = 10.0 * log10(255.0 * 255.0 * mse);
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} else {
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psnr = kMaxPsnr; // Limit to prevent divide by 0
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}
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if (psnr > kMaxPsnr)
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psnr = kMaxPsnr;
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return psnr;
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}
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LIBYUV_API
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double CalcFramePsnr(const uint8* src_a, int stride_a,
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const uint8* src_b, int stride_b,
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int width, int height) {
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const uint64 samples = width * height;
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const uint64 sse = ComputeSumSquareErrorPlane(src_a, stride_a,
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src_b, stride_b,
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width, height);
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return SumSquareErrorToPsnr(sse, samples);
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}
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LIBYUV_API
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double I420Psnr(const uint8* src_y_a, int stride_y_a,
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const uint8* src_u_a, int stride_u_a,
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const uint8* src_v_a, int stride_v_a,
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const uint8* src_y_b, int stride_y_b,
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const uint8* src_u_b, int stride_u_b,
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const uint8* src_v_b, int stride_v_b,
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int width, int height) {
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const uint64 sse_y = ComputeSumSquareErrorPlane(src_y_a, stride_y_a,
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src_y_b, stride_y_b,
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width, height);
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const int width_uv = (width + 1) >> 1;
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const int height_uv = (height + 1) >> 1;
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const uint64 sse_u = ComputeSumSquareErrorPlane(src_u_a, stride_u_a,
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src_u_b, stride_u_b,
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width_uv, height_uv);
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const uint64 sse_v = ComputeSumSquareErrorPlane(src_v_a, stride_v_a,
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src_v_b, stride_v_b,
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width_uv, height_uv);
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const uint64 samples = width * height + 2 * (width_uv * height_uv);
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const uint64 sse = sse_y + sse_u + sse_v;
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return SumSquareErrorToPsnr(sse, samples);
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}
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static const int64 cc1 = 26634; // (64^2*(.01*255)^2
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static const int64 cc2 = 239708; // (64^2*(.03*255)^2
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static double Ssim8x8_C(const uint8* src_a, int stride_a,
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const uint8* src_b, int stride_b) {
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int64 sum_a = 0;
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int64 sum_b = 0;
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int64 sum_sq_a = 0;
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int64 sum_sq_b = 0;
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int64 sum_axb = 0;
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int i;
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for (i = 0; i < 8; ++i) {
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int j;
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for (j = 0; j < 8; ++j) {
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sum_a += src_a[j];
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sum_b += src_b[j];
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sum_sq_a += src_a[j] * src_a[j];
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sum_sq_b += src_b[j] * src_b[j];
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sum_axb += src_a[j] * src_b[j];
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}
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src_a += stride_a;
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src_b += stride_b;
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}
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{
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const int64 count = 64;
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// scale the constants by number of pixels
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const int64 c1 = (cc1 * count * count) >> 12;
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const int64 c2 = (cc2 * count * count) >> 12;
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const int64 sum_a_x_sum_b = sum_a * sum_b;
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const int64 ssim_n = (2 * sum_a_x_sum_b + c1) *
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(2 * count * sum_axb - 2 * sum_a_x_sum_b + c2);
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const int64 sum_a_sq = sum_a*sum_a;
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const int64 sum_b_sq = sum_b*sum_b;
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const int64 ssim_d = (sum_a_sq + sum_b_sq + c1) *
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(count * sum_sq_a - sum_a_sq +
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count * sum_sq_b - sum_b_sq + c2);
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if (ssim_d == 0.0) {
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return DBL_MAX;
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}
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return ssim_n * 1.0 / ssim_d;
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}
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}
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// We are using a 8x8 moving window with starting location of each 8x8 window
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// on the 4x4 pixel grid. Such arrangement allows the windows to overlap
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// block boundaries to penalize blocking artifacts.
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LIBYUV_API
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double CalcFrameSsim(const uint8* src_a, int stride_a,
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const uint8* src_b, int stride_b,
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int width, int height) {
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int samples = 0;
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double ssim_total = 0;
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double (*Ssim8x8)(const uint8* src_a, int stride_a,
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const uint8* src_b, int stride_b) = Ssim8x8_C;
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// sample point start with each 4x4 location
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int i;
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for (i = 0; i < height - 8; i += 4) {
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int j;
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for (j = 0; j < width - 8; j += 4) {
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ssim_total += Ssim8x8(src_a + j, stride_a, src_b + j, stride_b);
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samples++;
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}
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src_a += stride_a * 4;
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src_b += stride_b * 4;
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}
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ssim_total /= samples;
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return ssim_total;
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}
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LIBYUV_API
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double I420Ssim(const uint8* src_y_a, int stride_y_a,
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const uint8* src_u_a, int stride_u_a,
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const uint8* src_v_a, int stride_v_a,
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const uint8* src_y_b, int stride_y_b,
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const uint8* src_u_b, int stride_u_b,
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const uint8* src_v_b, int stride_v_b,
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int width, int height) {
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const double ssim_y = CalcFrameSsim(src_y_a, stride_y_a,
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src_y_b, stride_y_b, width, height);
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const int width_uv = (width + 1) >> 1;
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const int height_uv = (height + 1) >> 1;
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const double ssim_u = CalcFrameSsim(src_u_a, stride_u_a,
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src_u_b, stride_u_b,
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width_uv, height_uv);
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const double ssim_v = CalcFrameSsim(src_v_a, stride_v_a,
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src_v_b, stride_v_b,
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width_uv, height_uv);
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return ssim_y * 0.8 + 0.1 * (ssim_u + ssim_v);
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}
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#ifdef __cplusplus
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} // extern "C"
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} // namespace libyuv
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#endif
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