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/*
* Copyright (c) 2015 The WebRTC 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 <emmintrin.h>
#include "webrtc/modules/video_processing/util/denoiser_filter_sse2.h"
namespace webrtc {
static void Get8x8varSse2(const uint8_t* src,
int src_stride,
const uint8_t* ref,
int ref_stride,
unsigned int* sse,
int* sum) {
const __m128i zero = _mm_setzero_si128();
__m128i vsum = _mm_setzero_si128();
__m128i vsse = _mm_setzero_si128();
for (int i = 0; i < 8; i += 2) {
const __m128i src0 = _mm_unpacklo_epi8(
_mm_loadl_epi64((const __m128i*)(src + i * src_stride)), zero);
const __m128i ref0 = _mm_unpacklo_epi8(
_mm_loadl_epi64((const __m128i*)(ref + i * ref_stride)), zero);
const __m128i diff0 = _mm_sub_epi16(src0, ref0);
const __m128i src1 = _mm_unpacklo_epi8(
_mm_loadl_epi64((const __m128i*)(src + (i + 1) * src_stride)), zero);
const __m128i ref1 = _mm_unpacklo_epi8(
_mm_loadl_epi64((const __m128i*)(ref + (i + 1) * ref_stride)), zero);
const __m128i diff1 = _mm_sub_epi16(src1, ref1);
vsum = _mm_add_epi16(vsum, diff0);
vsum = _mm_add_epi16(vsum, diff1);
vsse = _mm_add_epi32(vsse, _mm_madd_epi16(diff0, diff0));
vsse = _mm_add_epi32(vsse, _mm_madd_epi16(diff1, diff1));
}
// sum
vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 8));
vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 4));
vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 2));
*sum = static_cast<int16_t>(_mm_extract_epi16(vsum, 0));
// sse
vsse = _mm_add_epi32(vsse, _mm_srli_si128(vsse, 8));
vsse = _mm_add_epi32(vsse, _mm_srli_si128(vsse, 4));
*sse = _mm_cvtsi128_si32(vsse);
}
static void VarianceSSE2(const unsigned char* src,
int src_stride,
const unsigned char* ref,
int ref_stride,
int w,
int h,
uint32_t* sse,
int64_t* sum,
int block_size) {
*sse = 0;
*sum = 0;
for (int i = 0; i < h; i += block_size) {
for (int j = 0; j < w; j += block_size) {
uint32_t sse0 = 0;
int32_t sum0 = 0;
Get8x8varSse2(src + src_stride * i + j, src_stride,
ref + ref_stride * i + j, ref_stride, &sse0, &sum0);
*sse += sse0;
*sum += sum0;
}
}
}
// Compute the sum of all pixel differences of this MB.
static uint32_t AbsSumDiff16x1(__m128i acc_diff) {
const __m128i k_1 = _mm_set1_epi16(1);
const __m128i acc_diff_lo =
_mm_srai_epi16(_mm_unpacklo_epi8(acc_diff, acc_diff), 8);
const __m128i acc_diff_hi =
_mm_srai_epi16(_mm_unpackhi_epi8(acc_diff, acc_diff), 8);
const __m128i acc_diff_16 = _mm_add_epi16(acc_diff_lo, acc_diff_hi);
const __m128i hg_fe_dc_ba = _mm_madd_epi16(acc_diff_16, k_1);
const __m128i hgfe_dcba =
_mm_add_epi32(hg_fe_dc_ba, _mm_srli_si128(hg_fe_dc_ba, 8));
const __m128i hgfedcba =
_mm_add_epi32(hgfe_dcba, _mm_srli_si128(hgfe_dcba, 4));
unsigned int sum_diff = abs(_mm_cvtsi128_si32(hgfedcba));
return sum_diff;
}
// TODO(jackychen): Optimize this function using SSE2.
void DenoiserFilterSSE2::CopyMem16x16(const uint8_t* src,
int src_stride,
uint8_t* dst,
int dst_stride) {
for (int i = 0; i < 16; i++) {
memcpy(dst, src, 16);
src += src_stride;
dst += dst_stride;
}
}
uint32_t DenoiserFilterSSE2::Variance16x8(const uint8_t* src,
int src_stride,
const uint8_t* ref,
int ref_stride,
uint32_t* sse) {
int64_t sum = 0;
VarianceSSE2(src, src_stride << 1, ref, ref_stride << 1, 16, 8, sse, &sum, 8);
return *sse - ((sum * sum) >> 7);
}
DenoiserDecision DenoiserFilterSSE2::MbDenoise(const uint8_t* mc_running_avg_y,
int mc_avg_y_stride,
uint8_t* running_avg_y,
int avg_y_stride,
const uint8_t* sig,
int sig_stride,
uint8_t motion_magnitude,
int increase_denoising) {
DenoiserDecision decision = FILTER_BLOCK;
unsigned int sum_diff_thresh = 0;
int shift_inc =
(increase_denoising && motion_magnitude <= kMotionMagnitudeThreshold) ? 1
: 0;
__m128i acc_diff = _mm_setzero_si128();
const __m128i k_0 = _mm_setzero_si128();
const __m128i k_4 = _mm_set1_epi8(4 + shift_inc);
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 <= kMotionMagnitudeThreshold) ? 7 + shift_inc : 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 (int r = 0; r < 16; ++r) {
// Calculate differences.
const __m128i v_sig =
_mm_loadu_si128(reinterpret_cast<const __m128i*>(&sig[0]));
const __m128i v_mc_running_avg_y =
_mm_loadu_si128(reinterpret_cast<const __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(reinterpret_cast<__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.
unsigned int abs_sum_diff = AbsSumDiff16x1(acc_diff);
sum_diff_thresh =
increase_denoising ? kSumDiffThresholdHigh : kSumDiffThreshold;
if (abs_sum_diff > sum_diff_thresh)
decision = COPY_BLOCK;
return decision;
}
} // namespace webrtc