1 /*
2  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
3  *
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.
9  */
10 
11 #ifndef VP8_ENCODER_DENOISING_H_
12 #define VP8_ENCODER_DENOISING_H_
13 
14 #include "block.h"
15 #include "vp8/common/loopfilter.h"
16 
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20 
21 #define SUM_DIFF_THRESHOLD (16 * 16 * 2)
22 #define SUM_DIFF_THRESHOLD_HIGH (16 * 16 * 3)
23 #define MOTION_MAGNITUDE_THRESHOLD (8*3)
24 
25 #define SUM_DIFF_THRESHOLD_UV (96)   // (8 * 8 * 1.5)
26 #define SUM_DIFF_THRESHOLD_HIGH_UV (8 * 8 * 2)
27 #define SUM_DIFF_FROM_AVG_THRESH_UV (8 * 8 * 4)
28 #define MOTION_MAGNITUDE_THRESHOLD_UV (8*3)
29 
30 enum vp8_denoiser_decision
31 {
32   COPY_BLOCK,
33   FILTER_BLOCK
34 };
35 
36 enum vp8_denoiser_filter_state {
37   kNoFilter,
38   kFilterZeroMV,
39   kFilterNonZeroMV
40 };
41 
42 enum vp8_denoiser_mode {
43   kDenoiserOff,
44   kDenoiserOnYOnly,
45   kDenoiserOnYUV,
46   kDenoiserOnYUVAggressive
47 };
48 
49 typedef struct {
50   // Scale factor on sse threshold above which no denoising is done.
51   unsigned int scale_sse_thresh;
52   // Scale factor on motion magnitude threshold above which no
53   // denoising is done.
54   unsigned int scale_motion_thresh;
55   // Scale factor on motion magnitude below which we increase the strength of
56   // the temporal filter (in function vp8_denoiser_filter).
57   unsigned int scale_increase_filter;
58   // Scale factor to bias to ZEROMV for denoising.
59   unsigned int denoise_mv_bias;
60   // Scale factor to bias to ZEROMV for coding mode selection.
61   unsigned int pickmode_mv_bias;
62   // Quantizer threshold below which we use the segmentation map to switch off
63   // loop filter for blocks that have been coded as ZEROMV-LAST a certain number
64   // (consec_zerolast) of consecutive frames. Note that the delta-QP is set to
65   // 0 when segmentation map is used for shutting off loop filter.
66   unsigned int qp_thresh;
67   // Threshold for number of consecutive frames for blocks coded as ZEROMV-LAST.
68   unsigned int consec_zerolast;
69 } denoise_params;
70 
71 typedef struct vp8_denoiser
72 {
73     YV12_BUFFER_CONFIG yv12_running_avg[MAX_REF_FRAMES];
74     YV12_BUFFER_CONFIG yv12_mc_running_avg;
75     unsigned char* denoise_state;
76     int num_mb_cols;
77     int denoiser_mode;
78     denoise_params denoise_pars;
79 } VP8_DENOISER;
80 
81 int vp8_denoiser_allocate(VP8_DENOISER *denoiser, int width, int height,
82                           int num_mb_rows, int num_mb_cols, int mode);
83 
84 void vp8_denoiser_free(VP8_DENOISER *denoiser);
85 
86 void vp8_denoiser_denoise_mb(VP8_DENOISER *denoiser,
87                              MACROBLOCK *x,
88                              unsigned int best_sse,
89                              unsigned int zero_mv_sse,
90                              int recon_yoffset,
91                              int recon_uvoffset,
92                              loop_filter_info_n *lfi_n,
93                              int mb_row,
94                              int mb_col,
95                              int block_index);
96 
97 #ifdef __cplusplus
98 }  // extern "C"
99 #endif
100 
101 #endif  // VP8_ENCODER_DENOISING_H_
102