1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include <assert.h>
13
14 #include "av1/common/av1_loopfilter.h"
15 #include "av1/common/blockd.h"
16 #include "av1/common/seg_common.h"
17 #include "av1/common/quant_common.h"
18
19 static const int seg_feature_data_signed[SEG_LVL_MAX] = {
20 1, 1, 1, 1, 1, 0, 0, 0
21 };
22
23 static const int seg_feature_data_max[SEG_LVL_MAX] = { MAXQ,
24 MAX_LOOP_FILTER,
25 MAX_LOOP_FILTER,
26 MAX_LOOP_FILTER,
27 MAX_LOOP_FILTER,
28 7,
29 0,
30 0 };
31
32 // These functions provide access to new segment level features.
33 // Eventually these function may be "optimized out" but for the moment,
34 // the coding mechanism is still subject to change so these provide a
35 // convenient single point of change.
36
av1_clearall_segfeatures(struct segmentation * seg)37 void av1_clearall_segfeatures(struct segmentation *seg) {
38 av1_zero(seg->feature_data);
39 av1_zero(seg->feature_mask);
40 }
41
calculate_segdata(struct segmentation * seg)42 void calculate_segdata(struct segmentation *seg) {
43 seg->segid_preskip = 0;
44 seg->last_active_segid = 0;
45 for (int i = 0; i < MAX_SEGMENTS; i++) {
46 for (int j = 0; j < SEG_LVL_MAX; j++) {
47 if (seg->feature_mask[i] & (1 << j)) {
48 seg->segid_preskip |= (j >= SEG_LVL_REF_FRAME);
49 seg->last_active_segid = i;
50 }
51 }
52 }
53 }
54
av1_enable_segfeature(struct segmentation * seg,int segment_id,SEG_LVL_FEATURES feature_id)55 void av1_enable_segfeature(struct segmentation *seg, int segment_id,
56 SEG_LVL_FEATURES feature_id) {
57 seg->feature_mask[segment_id] |= 1 << feature_id;
58 }
59
av1_seg_feature_data_max(SEG_LVL_FEATURES feature_id)60 int av1_seg_feature_data_max(SEG_LVL_FEATURES feature_id) {
61 return seg_feature_data_max[feature_id];
62 }
63
av1_is_segfeature_signed(SEG_LVL_FEATURES feature_id)64 int av1_is_segfeature_signed(SEG_LVL_FEATURES feature_id) {
65 return seg_feature_data_signed[feature_id];
66 }
67
68 // The 'seg_data' given for each segment can be either deltas (from the default
69 // value chosen for the frame) or absolute values.
70 //
71 // Valid range for abs values is (0-127 for MB_LVL_ALT_Q), (0-63 for
72 // SEGMENT_ALT_LF)
73 // Valid range for delta values are (+/-127 for MB_LVL_ALT_Q), (+/-63 for
74 // SEGMENT_ALT_LF)
75 //
76 // abs_delta = SEGMENT_DELTADATA (deltas) abs_delta = SEGMENT_ABSDATA (use
77 // the absolute values given).
78
av1_set_segdata(struct segmentation * seg,int segment_id,SEG_LVL_FEATURES feature_id,int seg_data)79 void av1_set_segdata(struct segmentation *seg, int segment_id,
80 SEG_LVL_FEATURES feature_id, int seg_data) {
81 if (seg_data < 0) {
82 assert(seg_feature_data_signed[feature_id]);
83 assert(-seg_data <= seg_feature_data_max[feature_id]);
84 } else {
85 assert(seg_data <= seg_feature_data_max[feature_id]);
86 }
87
88 seg->feature_data[segment_id][feature_id] = seg_data;
89 }
90
91 // TBD? Functions to read and write segment data with range / validity checking
92