2 * Copyright (c) 2015 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
15 #include "./vpx_dsp_rtcd.h"
16 #include "vpx_dsp/vpx_dsp_common.h"
17 #include "vpx_scale/yv12config.h"
18 #include "vpx/vpx_integer.h"
19 #include "vp9/common/vp9_reconinter.h"
20 #include "vp9/encoder/vp9_context_tree.h"
21 #include "vp9/encoder/vp9_noise_estimate.h"
22 #include "vp9/encoder/vp9_encoder.h"
24 void vp9_noise_estimate_init(NOISE_ESTIMATE *const ne, int width, int height) {
32 if (width * height >= 1920 * 1080) {
34 } else if (width * height >= 1280 * 720) {
36 } else if (width * height >= 640 * 360) {
39 ne->num_frames_estimate = 15;
42 static int enable_noise_estimation(VP9_COMP *const cpi) {
43 #if CONFIG_VP9_HIGHBITDEPTH
44 if (cpi->common.use_highbitdepth) return 0;
46 // Enable noise estimation if denoising is on.
47 #if CONFIG_VP9_TEMPORAL_DENOISING
48 if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi) &&
49 cpi->common.width >= 320 && cpi->common.height >= 180)
52 // Only allow noise estimate under certain encoding mode.
53 // Enabled for 1 pass CBR, speed >=5, and if resolution is same as original.
54 // Not enabled for SVC mode and screen_content_mode.
55 // Not enabled for low resolutions.
56 if (cpi->oxcf.pass == 0 && cpi->oxcf.rc_mode == VPX_CBR &&
57 cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->oxcf.speed >= 5 &&
58 cpi->resize_state == ORIG && cpi->resize_pending == 0 && !cpi->use_svc &&
59 cpi->oxcf.content != VP9E_CONTENT_SCREEN && cpi->common.width >= 640 &&
60 cpi->common.height >= 360)
66 #if CONFIG_VP9_TEMPORAL_DENOISING
67 static void copy_frame(YV12_BUFFER_CONFIG *const dest,
68 const YV12_BUFFER_CONFIG *const src) {
70 const uint8_t *srcbuf = src->y_buffer;
71 uint8_t *destbuf = dest->y_buffer;
73 assert(dest->y_width == src->y_width);
74 assert(dest->y_height == src->y_height);
76 for (r = 0; r < dest->y_height; ++r) {
77 memcpy(destbuf, srcbuf, dest->y_width);
78 destbuf += dest->y_stride;
79 srcbuf += src->y_stride;
82 #endif // CONFIG_VP9_TEMPORAL_DENOISING
84 NOISE_LEVEL vp9_noise_estimate_extract_level(NOISE_ESTIMATE *const ne) {
85 int noise_level = kLowLow;
86 if (ne->value > (ne->thresh << 1)) {
89 if (ne->value > ne->thresh)
90 noise_level = kMedium;
91 else if (ne->value > ((9 * ne->thresh) >> 4))
94 noise_level = kLowLow;
99 void vp9_update_noise_estimate(VP9_COMP *const cpi) {
100 const VP9_COMMON *const cm = &cpi->common;
101 NOISE_ESTIMATE *const ne = &cpi->noise_estimate;
102 const int low_res = (cm->width <= 352 && cm->height <= 288);
103 // Estimate of noise level every frame_period frames.
104 int frame_period = 8;
105 int thresh_consec_zeromv = 6;
106 unsigned int thresh_sum_diff = 100;
107 unsigned int thresh_sum_spatial = (200 * 200) << 8;
108 unsigned int thresh_spatial_var = (32 * 32) << 8;
109 int min_blocks_estimate = cm->mi_rows * cm->mi_cols >> 7;
110 int frame_counter = cm->current_video_frame;
111 // Estimate is between current source and last source.
112 YV12_BUFFER_CONFIG *last_source = cpi->Last_Source;
113 #if CONFIG_VP9_TEMPORAL_DENOISING
114 if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi))
115 last_source = &cpi->denoiser.last_source;
117 // Tune these thresholds for different resolutions.
118 if (cm->width > 640 && cm->width < 1920) {
119 thresh_consec_zeromv = 5;
120 thresh_sum_diff = 200;
121 thresh_sum_spatial = (120 * 120) << 8;
122 thresh_spatial_var = (48 * 48) << 8;
124 ne->enabled = enable_noise_estimation(cpi);
125 if (cpi->svc.number_spatial_layers > 1)
126 frame_counter = cpi->svc.current_superframe;
127 if (!ne->enabled || frame_counter % frame_period != 0 ||
128 last_source == NULL ||
129 (cpi->svc.number_spatial_layers == 1 &&
130 (ne->last_w != cm->width || ne->last_h != cm->height))) {
131 #if CONFIG_VP9_TEMPORAL_DENOISING
132 if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi))
133 copy_frame(&cpi->denoiser.last_source, cpi->Source);
135 if (last_source != NULL) {
136 ne->last_w = cm->width;
137 ne->last_h = cm->height;
140 } else if (cm->current_video_frame > 60 &&
141 cpi->rc.avg_frame_low_motion < (low_res ? 70 : 50)) {
142 // Force noise estimation to 0 and denoiser off if content has high motion.
145 ne->num_frames_estimate = 10;
146 #if CONFIG_VP9_TEMPORAL_DENOISING
147 if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi) &&
148 cpi->svc.current_superframe > 1) {
149 vp9_denoiser_set_noise_level(&cpi->denoiser, ne->level);
150 copy_frame(&cpi->denoiser.last_source, cpi->Source);
156 uint64_t avg_est = 0;
157 int bsize = BLOCK_16X16;
158 static const unsigned char const_source[16] = { 0, 0, 0, 0, 0, 0, 0, 0,
159 0, 0, 0, 0, 0, 0, 0, 0 };
160 // Loop over sub-sample of 16x16 blocks of frame, and for blocks that have
161 // been encoded as zero/small mv at least x consecutive frames, compute
162 // the variance to update estimate of noise in the source.
163 const uint8_t *src_y = cpi->Source->y_buffer;
164 const int src_ystride = cpi->Source->y_stride;
165 const uint8_t *last_src_y = last_source->y_buffer;
166 const int last_src_ystride = last_source->y_stride;
167 const uint8_t *src_u = cpi->Source->u_buffer;
168 const uint8_t *src_v = cpi->Source->v_buffer;
169 const int src_uvstride = cpi->Source->uv_stride;
171 int num_low_motion = 0;
172 int frame_low_motion = 1;
173 for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {
174 for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {
175 int bl_index = mi_row * cm->mi_cols + mi_col;
176 if (cpi->consec_zero_mv[bl_index] > thresh_consec_zeromv)
180 if (num_low_motion < ((3 * cm->mi_rows * cm->mi_cols) >> 3))
181 frame_low_motion = 0;
182 for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {
183 for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {
184 // 16x16 blocks, 1/4 sample of frame.
185 if (mi_row % 4 == 0 && mi_col % 4 == 0 && mi_row < cm->mi_rows - 1 &&
186 mi_col < cm->mi_cols - 1) {
187 int bl_index = mi_row * cm->mi_cols + mi_col;
188 int bl_index1 = bl_index + 1;
189 int bl_index2 = bl_index + cm->mi_cols;
190 int bl_index3 = bl_index2 + 1;
191 // Only consider blocks that are likely steady background. i.e, have
192 // been encoded as zero/low motion x (= thresh_consec_zeromv) frames
193 // in a row. consec_zero_mv[] defined for 8x8 blocks, so consider all
194 // 4 sub-blocks for 16x16 block. Also, avoid skin blocks.
196 VPXMIN(cpi->consec_zero_mv[bl_index],
197 VPXMIN(cpi->consec_zero_mv[bl_index1],
198 VPXMIN(cpi->consec_zero_mv[bl_index2],
199 cpi->consec_zero_mv[bl_index3])));
201 if (cpi->use_skin_detection) {
203 vp9_compute_skin_block(src_y, src_u, src_v, src_ystride,
204 src_uvstride, bsize, consec_zeromv, 0);
206 if (frame_low_motion &&
207 cpi->consec_zero_mv[bl_index] > thresh_consec_zeromv &&
208 cpi->consec_zero_mv[bl_index1] > thresh_consec_zeromv &&
209 cpi->consec_zero_mv[bl_index2] > thresh_consec_zeromv &&
210 cpi->consec_zero_mv[bl_index3] > thresh_consec_zeromv &&
214 unsigned int variance = cpi->fn_ptr[bsize].vf(
215 src_y, src_ystride, last_src_y, last_src_ystride, &sse);
216 // Only consider this block as valid for noise measurement if the
217 // average term (sse - variance = N * avg^{2}, N = 16X16) of the
218 // temporal residual is small (avoid effects from lighting change).
219 if ((sse - variance) < thresh_sum_diff) {
221 const unsigned int spatial_variance = cpi->fn_ptr[bsize].vf(
222 src_y, src_ystride, const_source, 0, &sse2);
223 // Avoid blocks with high brightness and high spatial variance.
224 if ((sse2 - spatial_variance) < thresh_sum_spatial &&
225 spatial_variance < thresh_spatial_var) {
226 avg_est += low_res ? variance >> 4
227 : variance / ((spatial_variance >> 9) + 1);
238 src_y += (src_ystride << 3) - (cm->mi_cols << 3);
239 last_src_y += (last_src_ystride << 3) - (cm->mi_cols << 3);
240 src_u += (src_uvstride << 2) - (cm->mi_cols << 2);
241 src_v += (src_uvstride << 2) - (cm->mi_cols << 2);
243 ne->last_w = cm->width;
244 ne->last_h = cm->height;
245 // Update noise estimate if we have at a minimum number of block samples,
246 // and avg_est > 0 (avg_est == 0 can happen if the application inputs
247 // duplicate frames).
248 if (num_samples > min_blocks_estimate && avg_est > 0) {
250 avg_est = avg_est / num_samples;
251 // Update noise estimate.
252 ne->value = (int)((15 * ne->value + avg_est) >> 4);
254 if (ne->count == ne->num_frames_estimate) {
255 // Reset counter and check noise level condition.
256 ne->num_frames_estimate = 30;
258 ne->level = vp9_noise_estimate_extract_level(ne);
259 #if CONFIG_VP9_TEMPORAL_DENOISING
260 if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi))
261 vp9_denoiser_set_noise_level(&cpi->denoiser, ne->level);
266 #if CONFIG_VP9_TEMPORAL_DENOISING
267 if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi))
268 copy_frame(&cpi->denoiser.last_source, cpi->Source);