1 /*
2 * Copyright (c) 2013 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 #include <math.h>
12
13 #include "vpx_ports/mem.h"
14 #include "vpx_ports/system_state.h"
15
16 #include "vp9/encoder/vp9_aq_360.h"
17 #include "vp9/encoder/vp9_aq_variance.h"
18
19 #include "vp9/common/vp9_seg_common.h"
20
21 #include "vp9/encoder/vp9_ratectrl.h"
22 #include "vp9/encoder/vp9_rd.h"
23 #include "vp9/encoder/vp9_segmentation.h"
24
25 static const double rate_ratio[MAX_SEGMENTS] = { 1.0, 0.75, 0.6, 0.5,
26 0.4, 0.3, 0.25 };
27
28 // Sets segment id 0 for the equatorial region, 1 for temperate region
29 // and 2 for the polar regions
vp9_360aq_segment_id(int mi_row,int mi_rows)30 unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows) {
31 if (mi_row < mi_rows / 8 || mi_row > mi_rows - mi_rows / 8)
32 return 2;
33 else if (mi_row < mi_rows / 4 || mi_row > mi_rows - mi_rows / 4)
34 return 1;
35 else
36 return 0;
37 }
38
vp9_360aq_frame_setup(VP9_COMP * cpi)39 void vp9_360aq_frame_setup(VP9_COMP *cpi) {
40 VP9_COMMON *cm = &cpi->common;
41 struct segmentation *seg = &cm->seg;
42 int i;
43
44 if (frame_is_intra_only(cm) || cpi->force_update_segmentation ||
45 cm->error_resilient_mode) {
46 vp9_enable_segmentation(seg);
47 vp9_clearall_segfeatures(seg);
48
49 seg->abs_delta = SEGMENT_DELTADATA;
50
51 vpx_clear_system_state();
52
53 for (i = 0; i < MAX_SEGMENTS; ++i) {
54 int qindex_delta =
55 vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
56 rate_ratio[i], cm->bit_depth);
57
58 // We don't allow qindex 0 in a segment if the base value is not 0.
59 // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
60 // Q delta is sometimes applied without going back around the rd loop.
61 // This could lead to an illegal combination of partition size and q.
62 if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
63 qindex_delta = -cm->base_qindex + 1;
64 }
65
66 // No need to enable SEG_LVL_ALT_Q for this segment.
67 if (rate_ratio[i] == 1.0) {
68 continue;
69 }
70
71 vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
72 vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
73 }
74 }
75 }
76