1 /*
2  *  Copyright (c) 2014 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 VPX_VP9_ENCODER_VP9_AQ_CYCLICREFRESH_H_
12 #define VPX_VP9_ENCODER_VP9_AQ_CYCLICREFRESH_H_
13 
14 #include "vpx/vpx_integer.h"
15 #include "vp9/common/vp9_blockd.h"
16 #include "vp9/encoder/vp9_block.h"
17 #include "vp9/encoder/vp9_skin_detection.h"
18 
19 #ifdef __cplusplus
20 extern "C" {
21 #endif
22 
23 // The segment ids used in cyclic refresh: from base (no boost) to increasing
24 // boost (higher delta-qp).
25 #define CR_SEGMENT_ID_BASE 0
26 #define CR_SEGMENT_ID_BOOST1 1
27 #define CR_SEGMENT_ID_BOOST2 2
28 
29 // Maximum rate target ratio for setting segment delta-qp.
30 #define CR_MAX_RATE_TARGET_RATIO 4.0
31 
32 struct CYCLIC_REFRESH {
33   // Percentage of blocks per frame that are targeted as candidates
34   // for cyclic refresh.
35   int percent_refresh;
36   // Maximum q-delta as percentage of base q.
37   int max_qdelta_perc;
38   // Superblock starting index for cycling through the frame.
39   int sb_index;
40   // Controls how long block will need to wait to be refreshed again, in
41   // excess of the cycle time, i.e., in the case of all zero motion, block
42   // will be refreshed every (100/percent_refresh + time_for_refresh) frames.
43   int time_for_refresh;
44   // Target number of (8x8) blocks that are set for delta-q.
45   int target_num_seg_blocks;
46   // Actual number of (8x8) blocks that were applied delta-q.
47   int actual_num_seg1_blocks;
48   int actual_num_seg2_blocks;
49   // RD mult. parameters for segment 1.
50   int rdmult;
51   // Cyclic refresh map.
52   signed char *map;
53   // Map of the last q a block was coded at.
54   uint8_t *last_coded_q_map;
55   // Thresholds applied to the projected rate/distortion of the coding block,
56   // when deciding whether block should be refreshed.
57   int64_t thresh_rate_sb;
58   int64_t thresh_dist_sb;
59   // Threshold applied to the motion vector (in units of 1/8 pel) of the
60   // coding block, when deciding whether block should be refreshed.
61   int16_t motion_thresh;
62   // Rate target ratio to set q delta.
63   double rate_ratio_qdelta;
64   // Boost factor for rate target ratio, for segment CR_SEGMENT_ID_BOOST2.
65   int rate_boost_fac;
66   double low_content_avg;
67   int qindex_delta[3];
68   int reduce_refresh;
69   double weight_segment;
70   int apply_cyclic_refresh;
71   int counter_encode_maxq_scene_change;
72   int skip_flat_static_blocks;
73 };
74 
75 struct VP9_COMP;
76 
77 typedef struct CYCLIC_REFRESH CYCLIC_REFRESH;
78 
79 CYCLIC_REFRESH *vp9_cyclic_refresh_alloc(int mi_rows, int mi_cols);
80 
81 void vp9_cyclic_refresh_free(CYCLIC_REFRESH *cr);
82 
83 // Estimate the bits, incorporating the delta-q from segment 1, after encoding
84 // the frame.
85 int vp9_cyclic_refresh_estimate_bits_at_q(const struct VP9_COMP *cpi,
86                                           double correction_factor);
87 
88 // Estimate the bits per mb, for a given q = i and a corresponding delta-q
89 // (for segment 1), prior to encoding the frame.
90 int vp9_cyclic_refresh_rc_bits_per_mb(const struct VP9_COMP *cpi, int i,
91                                       double correction_factor);
92 
93 // Prior to coding a given prediction block, of size bsize at (mi_row, mi_col),
94 // check if we should reset the segment_id, and update the cyclic_refresh map
95 // and segmentation map.
96 void vp9_cyclic_refresh_update_segment(struct VP9_COMP *const cpi,
97                                        MODE_INFO *const mi, int mi_row,
98                                        int mi_col, BLOCK_SIZE bsize,
99                                        int64_t rate, int64_t dist, int skip,
100                                        struct macroblock_plane *const p);
101 
102 void vp9_cyclic_refresh_update_sb_postencode(struct VP9_COMP *const cpi,
103                                              const MODE_INFO *const mi,
104                                              int mi_row, int mi_col,
105                                              BLOCK_SIZE bsize);
106 
107 // From the just encoded frame: update the actual number of blocks that were
108 // applied the segment delta q, and the amount of low motion in the frame.
109 // Also check conditions for forcing golden update, or preventing golden
110 // update if the period is up.
111 void vp9_cyclic_refresh_postencode(struct VP9_COMP *const cpi);
112 
113 // Set golden frame update interval, for non-svc 1 pass CBR mode.
114 void vp9_cyclic_refresh_set_golden_update(struct VP9_COMP *const cpi);
115 
116 // Set/update global/frame level refresh parameters.
117 void vp9_cyclic_refresh_update_parameters(struct VP9_COMP *const cpi);
118 
119 // Setup cyclic background refresh: set delta q and segmentation map.
120 void vp9_cyclic_refresh_setup(struct VP9_COMP *const cpi);
121 
122 int vp9_cyclic_refresh_get_rdmult(const CYCLIC_REFRESH *cr);
123 
124 void vp9_cyclic_refresh_reset_resize(struct VP9_COMP *const cpi);
125 
cyclic_refresh_segment_id_boosted(int segment_id)126 static INLINE int cyclic_refresh_segment_id_boosted(int segment_id) {
127   return segment_id == CR_SEGMENT_ID_BOOST1 ||
128          segment_id == CR_SEGMENT_ID_BOOST2;
129 }
130 
cyclic_refresh_segment_id(int segment_id)131 static INLINE int cyclic_refresh_segment_id(int segment_id) {
132   if (segment_id == CR_SEGMENT_ID_BOOST1)
133     return CR_SEGMENT_ID_BOOST1;
134   else if (segment_id == CR_SEGMENT_ID_BOOST2)
135     return CR_SEGMENT_ID_BOOST2;
136   else
137     return CR_SEGMENT_ID_BASE;
138 }
139 
140 void vp9_cyclic_refresh_limit_q(const struct VP9_COMP *cpi, int *q);
141 
142 #ifdef __cplusplus
143 }  // extern "C"
144 #endif
145 
146 #endif  // VPX_VP9_ENCODER_VP9_AQ_CYCLICREFRESH_H_
147