ref: f10c173b40f20c201961a56fb82a7b609eeb15c1
dir: /vp8/encoder/arm/neon/denoising_neon.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 <arm_neon.h>
#include "vp8/encoder/denoising.h"
#include "vpx_mem/vpx_mem.h"
#include "./vp8_rtcd.h"
/*
* The filter function was modified to reduce the computational complexity.
*
* Step 1:
* Instead of applying tap coefficients for each pixel, we calculated the
* pixel adjustments vs. pixel diff value ahead of time.
* adjustment = filtered_value - current_raw
* = (filter_coefficient * diff + 128) >> 8
* where
* filter_coefficient = (255 << 8) / (256 + ((abs_diff * 330) >> 3));
* filter_coefficient += filter_coefficient /
* (3 + motion_magnitude_adjustment);
* filter_coefficient is clamped to 0 ~ 255.
*
* Step 2:
* The adjustment vs. diff curve becomes flat very quick when diff increases.
* This allowed us to use only several levels to approximate the curve without
* changing the filtering algorithm too much.
* The adjustments were further corrected by checking the motion magnitude.
* The levels used are:
* diff level adjustment w/o adjustment w/
* motion correction motion correction
* [-255, -16] 3 -6 -7
* [-15, -8] 2 -4 -5
* [-7, -4] 1 -3 -4
* [-3, 3] 0 diff diff
* [4, 7] 1 3 4
* [8, 15] 2 4 5
* [16, 255] 3 6 7
*/
int vp8_denoiser_filter_neon(YV12_BUFFER_CONFIG *mc_running_avg,
YV12_BUFFER_CONFIG *running_avg,
MACROBLOCK *signal, unsigned int motion_magnitude,
int y_offset, int uv_offset) {
/* If motion_magnitude is small, making the denoiser more aggressive by
* increasing the adjustment for each level, level1 adjustment is
* increased, the deltas stay the same.
*/
const uint8x16_t v_level1_adjustment = vdupq_n_u8(
(motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) ? 4 : 3);
const uint8x16_t v_delta_level_1_and_2 = vdupq_n_u8(1);
const uint8x16_t v_delta_level_2_and_3 = vdupq_n_u8(2);
const uint8x16_t v_level1_threshold = vdupq_n_u8(4);
const uint8x16_t v_level2_threshold = vdupq_n_u8(8);
const uint8x16_t v_level3_threshold = vdupq_n_u8(16);
/* Local variables for array pointers and strides. */
unsigned char *sig = signal->thismb;
int sig_stride = 16;
unsigned char *mc_running_avg_y = mc_running_avg->y_buffer + y_offset;
int mc_running_avg_y_stride = mc_running_avg->y_stride;
unsigned char *running_avg_y = running_avg->y_buffer + y_offset;
int running_avg_y_stride = running_avg->y_stride;
/* Go over lines. */
int i;
int sum_diff = 0;
for (i = 0; i < 16; ++i) {
int8x16_t v_sum_diff = vdupq_n_s8(0);
uint8x16_t v_running_avg_y;
/* Load inputs. */
const uint8x16_t v_sig = vld1q_u8(sig);
const uint8x16_t v_mc_running_avg_y = vld1q_u8(mc_running_avg_y);
/* Calculate absolute difference and sign masks. */
const uint8x16_t v_abs_diff = vabdq_u8(v_sig, v_mc_running_avg_y);
const uint8x16_t v_diff_pos_mask = vcltq_u8(v_sig, v_mc_running_avg_y);
const uint8x16_t v_diff_neg_mask = vcgtq_u8(v_sig, v_mc_running_avg_y);
/* Figure out which level that put us in. */
const uint8x16_t v_level1_mask = vcleq_u8(v_level1_threshold,
v_abs_diff);
const uint8x16_t v_level2_mask = vcleq_u8(v_level2_threshold,
v_abs_diff);
const uint8x16_t v_level3_mask = vcleq_u8(v_level3_threshold,
v_abs_diff);
/* Calculate absolute adjustments for level 1, 2 and 3. */
const uint8x16_t v_level2_adjustment = vandq_u8(v_level2_mask,
v_delta_level_1_and_2);
const uint8x16_t v_level3_adjustment = vandq_u8(v_level3_mask,
v_delta_level_2_and_3);
const uint8x16_t v_level1and2_adjustment = vaddq_u8(v_level1_adjustment,
v_level2_adjustment);
const uint8x16_t v_level1and2and3_adjustment = vaddq_u8(
v_level1and2_adjustment, v_level3_adjustment);
/* Figure adjustment absolute value by selecting between the absolute
* difference if in level0 or the value for level 1, 2 and 3.
*/
const uint8x16_t v_abs_adjustment = vbslq_u8(v_level1_mask,
v_level1and2and3_adjustment, v_abs_diff);
/* Calculate positive and negative adjustments. Apply them to the signal
* and accumulate them. Adjustments are less than eight and the maximum
* sum of them (7 * 16) can fit in a signed char.
*/
const uint8x16_t v_pos_adjustment = vandq_u8(v_diff_pos_mask,
v_abs_adjustment);
const uint8x16_t v_neg_adjustment = vandq_u8(v_diff_neg_mask,
v_abs_adjustment);
v_running_avg_y = vqaddq_u8(v_sig, v_pos_adjustment);
v_running_avg_y = vqsubq_u8(v_running_avg_y, v_neg_adjustment);
v_sum_diff = vqaddq_s8(v_sum_diff,
vreinterpretq_s8_u8(v_pos_adjustment));
v_sum_diff = vqsubq_s8(v_sum_diff,
vreinterpretq_s8_u8(v_neg_adjustment));
/* Store results. */
vst1q_u8(running_avg_y, v_running_avg_y);
/* Sum all the accumulators to have the sum of all pixel differences
* for this macroblock.
*/
{
int s0 = vgetq_lane_s8(v_sum_diff, 0) +
vgetq_lane_s8(v_sum_diff, 1) +
vgetq_lane_s8(v_sum_diff, 2) +
vgetq_lane_s8(v_sum_diff, 3);
int s1 = vgetq_lane_s8(v_sum_diff, 4) +
vgetq_lane_s8(v_sum_diff, 5) +
vgetq_lane_s8(v_sum_diff, 6) +
vgetq_lane_s8(v_sum_diff, 7);
int s2 = vgetq_lane_s8(v_sum_diff, 8) +
vgetq_lane_s8(v_sum_diff, 9) +
vgetq_lane_s8(v_sum_diff, 10) +
vgetq_lane_s8(v_sum_diff, 11);
int s3 = vgetq_lane_s8(v_sum_diff, 12) +
vgetq_lane_s8(v_sum_diff, 13) +
vgetq_lane_s8(v_sum_diff, 14) +
vgetq_lane_s8(v_sum_diff, 15);
sum_diff += s0 + s1+ s2 + s3;
}
/* Update pointers for next iteration. */
sig += sig_stride;
mc_running_avg_y += mc_running_avg_y_stride;
running_avg_y += running_avg_y_stride;
}
/* Too much adjustments => copy block. */
if (abs(sum_diff) > SUM_DIFF_THRESHOLD)
return COPY_BLOCK;
/* Tell above level that block was filtered. */
vp8_copy_mem16x16(running_avg->y_buffer + y_offset, running_avg_y_stride,
signal->thismb, sig_stride);
return FILTER_BLOCK;
}