ref: 0928da3b6e6d804a1f16f35227cc4f771b9e8e88
dir: /vp9/encoder/arm/neon/vp9_variance_neon.c/
/*
* 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.
*/
#include <arm_neon.h>
#include "./vp9_rtcd.h"
#include "vpx_ports/mem.h"
#include "vpx/vpx_integer.h"
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_filter.h"
#include "vp9/encoder/vp9_variance.h"
enum { kWidth8 = 8 };
enum { kHeight8 = 8 };
enum { kHeight8PlusOne = 9 };
enum { kWidth16 = 16 };
enum { kHeight16 = 16 };
enum { kHeight16PlusOne = 17 };
enum { kWidth32 = 32 };
enum { kHeight32 = 32 };
enum { kHeight32PlusOne = 33 };
enum { kPixelStepOne = 1 };
enum { kAlign16 = 16 };
static INLINE int horizontal_add_s16x8(const int16x8_t v_16x8) {
const int32x4_t a = vpaddlq_s16(v_16x8);
const int64x2_t b = vpaddlq_s32(a);
const int32x2_t c = vadd_s32(vreinterpret_s32_s64(vget_low_s64(b)),
vreinterpret_s32_s64(vget_high_s64(b)));
return vget_lane_s32(c, 0);
}
static INLINE int horizontal_add_s32x4(const int32x4_t v_32x4) {
const int64x2_t b = vpaddlq_s32(v_32x4);
const int32x2_t c = vadd_s32(vreinterpret_s32_s64(vget_low_s64(b)),
vreinterpret_s32_s64(vget_high_s64(b)));
return vget_lane_s32(c, 0);
}
static void variance_neon_w8(const uint8_t *a, int a_stride,
const uint8_t *b, int b_stride,
int w, int h, unsigned int *sse, int *sum) {
int i, j;
int16x8_t v_sum = vdupq_n_s16(0);
int32x4_t v_sse_lo = vdupq_n_s32(0);
int32x4_t v_sse_hi = vdupq_n_s32(0);
for (i = 0; i < h; ++i) {
for (j = 0; j < w; j += 8) {
const uint8x8_t v_a = vld1_u8(&a[j]);
const uint8x8_t v_b = vld1_u8(&b[j]);
const uint16x8_t v_diff = vsubl_u8(v_a, v_b);
const int16x8_t sv_diff = vreinterpretq_s16_u16(v_diff);
v_sum = vaddq_s16(v_sum, sv_diff);
v_sse_lo = vmlal_s16(v_sse_lo,
vget_low_s16(sv_diff),
vget_low_s16(sv_diff));
v_sse_hi = vmlal_s16(v_sse_hi,
vget_high_s16(sv_diff),
vget_high_s16(sv_diff));
}
a += a_stride;
b += b_stride;
}
*sum = horizontal_add_s16x8(v_sum);
*sse = (unsigned int)horizontal_add_s32x4(vaddq_s32(v_sse_lo, v_sse_hi));
}
void vp9_get8x8var_neon(const uint8_t *src_ptr, int source_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse, int *sum) {
variance_neon_w8(src_ptr, source_stride, ref_ptr, ref_stride, kWidth8,
kHeight8, sse, sum);
}
unsigned int vp9_variance8x8_neon(const uint8_t *a, int a_stride,
const uint8_t *b, int b_stride,
unsigned int *sse) {
int sum;
variance_neon_w8(a, a_stride, b, b_stride, kWidth8, kHeight8, sse, &sum);
return *sse - (((int64_t)sum * sum) / (kWidth8 * kHeight8));
}
void vp9_get16x16var_neon(const uint8_t *src_ptr, int source_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse, int *sum) {
variance_neon_w8(src_ptr, source_stride, ref_ptr, ref_stride, kWidth16,
kHeight16, sse, sum);
}
unsigned int vp9_variance16x16_neon(const uint8_t *a, int a_stride,
const uint8_t *b, int b_stride,
unsigned int *sse) {
int sum;
variance_neon_w8(a, a_stride, b, b_stride, kWidth16, kHeight16, sse, &sum);
return *sse - (((int64_t)sum * sum) / (kWidth16 * kHeight16));
}
static void var_filter_block2d_bil_w8(const uint8_t *src_ptr,
uint8_t *output_ptr,
unsigned int src_pixels_per_line,
int pixel_step,
unsigned int output_height,
unsigned int output_width,
const int16_t *vp9_filter) {
const uint8x8_t f0 = vmov_n_u8((uint8_t)vp9_filter[0]);
const uint8x8_t f1 = vmov_n_u8((uint8_t)vp9_filter[1]);
unsigned int i;
for (i = 0; i < output_height; ++i) {
const uint8x8_t src_0 = vld1_u8(&src_ptr[0]);
const uint8x8_t src_1 = vld1_u8(&src_ptr[pixel_step]);
const uint16x8_t a = vmull_u8(src_0, f0);
const uint16x8_t b = vmlal_u8(a, src_1, f1);
const uint8x8_t out = vrshrn_n_u16(b, FILTER_BITS);
vst1_u8(&output_ptr[0], out);
// Next row...
src_ptr += src_pixels_per_line;
output_ptr += output_width;
}
}
static void var_filter_block2d_bil_w16(const uint8_t *src_ptr,
uint8_t *output_ptr,
unsigned int src_pixels_per_line,
int pixel_step,
unsigned int output_height,
unsigned int output_width,
const int16_t *vp9_filter) {
const uint8x8_t f0 = vmov_n_u8((uint8_t)vp9_filter[0]);
const uint8x8_t f1 = vmov_n_u8((uint8_t)vp9_filter[1]);
unsigned int i, j;
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; j += 16) {
const uint8x16_t src_0 = vld1q_u8(&src_ptr[j]);
const uint8x16_t src_1 = vld1q_u8(&src_ptr[j + pixel_step]);
const uint16x8_t a = vmull_u8(vget_low_u8(src_0), f0);
const uint16x8_t b = vmlal_u8(a, vget_low_u8(src_1), f1);
const uint8x8_t out_lo = vrshrn_n_u16(b, FILTER_BITS);
const uint16x8_t c = vmull_u8(vget_high_u8(src_0), f0);
const uint16x8_t d = vmlal_u8(c, vget_high_u8(src_1), f1);
const uint8x8_t out_hi = vrshrn_n_u16(d, FILTER_BITS);
vst1q_u8(&output_ptr[j], vcombine_u8(out_lo, out_hi));
}
// Next row...
src_ptr += src_pixels_per_line;
output_ptr += output_width;
}
}
unsigned int vp9_sub_pixel_variance8x8_neon(const uint8_t *src,
int src_stride,
int xoffset,
int yoffset,
const uint8_t *dst,
int dst_stride,
unsigned int *sse) {
DECLARE_ALIGNED_ARRAY(kAlign16, uint8_t, temp2, kHeight8 * kWidth8);
DECLARE_ALIGNED_ARRAY(kAlign16, uint8_t, fdata3, kHeight8PlusOne * kWidth8);
var_filter_block2d_bil_w8(src, fdata3, src_stride, kPixelStepOne,
kHeight8PlusOne, kWidth8,
BILINEAR_FILTERS_2TAP(xoffset));
var_filter_block2d_bil_w8(fdata3, temp2, kWidth8, kWidth8, kHeight8,
kWidth8, BILINEAR_FILTERS_2TAP(yoffset));
return vp9_variance8x8_neon(temp2, kWidth8, dst, dst_stride, sse);
}
unsigned int vp9_sub_pixel_variance16x16_neon(const uint8_t *src,
int src_stride,
int xoffset,
int yoffset,
const uint8_t *dst,
int dst_stride,
unsigned int *sse) {
DECLARE_ALIGNED_ARRAY(kAlign16, uint8_t, temp2, kHeight16 * kWidth16);
DECLARE_ALIGNED_ARRAY(kAlign16, uint8_t, fdata3, kHeight16PlusOne * kWidth16);
var_filter_block2d_bil_w16(src, fdata3, src_stride, kPixelStepOne,
kHeight16PlusOne, kWidth16,
BILINEAR_FILTERS_2TAP(xoffset));
var_filter_block2d_bil_w16(fdata3, temp2, kWidth16, kWidth16, kHeight16,
kWidth16, BILINEAR_FILTERS_2TAP(yoffset));
return vp9_variance16x16_neon(temp2, kWidth16, dst, dst_stride, sse);
}
void vp9_get32x32var_neon(const uint8_t *src_ptr, int source_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse, int *sum) {
variance_neon_w8(src_ptr, source_stride, ref_ptr, ref_stride, kWidth32,
kHeight32, sse, sum);
}
unsigned int vp9_variance32x32_neon(const uint8_t *a, int a_stride,
const uint8_t *b, int b_stride,
unsigned int *sse) {
int sum;
variance_neon_w8(a, a_stride, b, b_stride, kWidth32, kHeight32, sse, &sum);
return *sse - (((int64_t)sum * sum) / (kWidth32 * kHeight32));
}
unsigned int vp9_sub_pixel_variance32x32_neon(const uint8_t *src,
int src_stride,
int xoffset,
int yoffset,
const uint8_t *dst,
int dst_stride,
unsigned int *sse) {
DECLARE_ALIGNED_ARRAY(kAlign16, uint8_t, temp2, kHeight32 * kWidth32);
DECLARE_ALIGNED_ARRAY(kAlign16, uint8_t, fdata3, kHeight32PlusOne * kWidth32);
var_filter_block2d_bil_w16(src, fdata3, src_stride, kPixelStepOne,
kHeight32PlusOne, kWidth32,
BILINEAR_FILTERS_2TAP(xoffset));
var_filter_block2d_bil_w16(fdata3, temp2, kWidth32, kWidth32, kHeight32,
kWidth32, BILINEAR_FILTERS_2TAP(yoffset));
return vp9_variance32x32_neon(temp2, kWidth32, dst, dst_stride, sse);
}