ref: 3316e2654f2cb5cf4052672a5a0e325f674523b6
dir: /vp8/encoder/x86/denoising_sse2.c/
/*
* Copyright (c) 2012 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 "vp8/encoder/denoising.h"
#include "vp8/common/reconinter.h"
#include "vpx/vpx_integer.h"
#include "vpx_mem/vpx_mem.h"
#include "vp8_rtcd.h"
#include <emmintrin.h>
#include "vpx_ports/emmintrin_compat.h"
union sum_union {
__m128i v;
signed char e[16];
};
int vp8_denoiser_filter_sse2(unsigned char *mc_running_avg_y,
int mc_avg_y_stride,
unsigned char *running_avg_y, int avg_y_stride,
unsigned char *sig, int sig_stride,
unsigned int motion_magnitude)
{
unsigned char *running_avg_y_start = running_avg_y;
unsigned char *sig_start = sig;
int r;
__m128i acc_diff = _mm_setzero_si128();
const __m128i k_0 = _mm_setzero_si128();
const __m128i k_4 = _mm_set1_epi8(4);
const __m128i k_8 = _mm_set1_epi8(8);
const __m128i k_16 = _mm_set1_epi8(16);
/* Modify each level's adjustment according to motion_magnitude. */
const __m128i l3 = _mm_set1_epi8(
(motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) ? 7 : 6);
/* Difference between level 3 and level 2 is 2. */
const __m128i l32 = _mm_set1_epi8(2);
/* Difference between level 2 and level 1 is 1. */
const __m128i l21 = _mm_set1_epi8(1);
for (r = 0; r < 16; ++r)
{
/* Calculate differences */
const __m128i v_sig = _mm_loadu_si128((__m128i *)(&sig[0]));
const __m128i v_mc_running_avg_y = _mm_loadu_si128(
(__m128i *)(&mc_running_avg_y[0]));
__m128i v_running_avg_y;
const __m128i pdiff = _mm_subs_epu8(v_mc_running_avg_y, v_sig);
const __m128i ndiff = _mm_subs_epu8(v_sig, v_mc_running_avg_y);
/* Obtain the sign. FF if diff is negative. */
const __m128i diff_sign = _mm_cmpeq_epi8(pdiff, k_0);
/* Clamp absolute difference to 16 to be used to get mask. Doing this
* allows us to use _mm_cmpgt_epi8, which operates on signed byte. */
const __m128i clamped_absdiff = _mm_min_epu8(
_mm_or_si128(pdiff, ndiff), k_16);
/* Get masks for l2 l1 and l0 adjustments */
const __m128i mask2 = _mm_cmpgt_epi8(k_16, clamped_absdiff);
const __m128i mask1 = _mm_cmpgt_epi8(k_8, clamped_absdiff);
const __m128i mask0 = _mm_cmpgt_epi8(k_4, clamped_absdiff);
/* Get adjustments for l2, l1, and l0 */
__m128i adj2 = _mm_and_si128(mask2, l32);
const __m128i adj1 = _mm_and_si128(mask1, l21);
const __m128i adj0 = _mm_and_si128(mask0, clamped_absdiff);
__m128i adj, padj, nadj;
/* Combine the adjustments and get absolute adjustments. */
adj2 = _mm_add_epi8(adj2, adj1);
adj = _mm_sub_epi8(l3, adj2);
adj = _mm_andnot_si128(mask0, adj);
adj = _mm_or_si128(adj, adj0);
/* Restore the sign and get positive and negative adjustments. */
padj = _mm_andnot_si128(diff_sign, adj);
nadj = _mm_and_si128(diff_sign, adj);
/* Calculate filtered value. */
v_running_avg_y = _mm_adds_epu8(v_sig, padj);
v_running_avg_y = _mm_subs_epu8(v_running_avg_y, nadj);
_mm_storeu_si128((__m128i *)running_avg_y, v_running_avg_y);
/* Adjustments <=7, and each element in acc_diff can fit in signed
* char.
*/
acc_diff = _mm_adds_epi8(acc_diff, padj);
acc_diff = _mm_subs_epi8(acc_diff, nadj);
/* Update pointers for next iteration. */
sig += sig_stride;
mc_running_avg_y += mc_avg_y_stride;
running_avg_y += avg_y_stride;
}
{
/* Compute the sum of all pixel differences of this MB. */
union sum_union s;
int sum_diff = 0;
s.v = acc_diff;
sum_diff = s.e[0] + s.e[1] + s.e[2] + s.e[3] + s.e[4] + s.e[5]
+ s.e[6] + s.e[7] + s.e[8] + s.e[9] + s.e[10] + s.e[11]
+ s.e[12] + s.e[13] + s.e[14] + s.e[15];
if (abs(sum_diff) > SUM_DIFF_THRESHOLD)
{
return COPY_BLOCK;
}
}
vp8_copy_mem16x16(running_avg_y_start, avg_y_stride, sig_start, sig_stride);
return FILTER_BLOCK;
}