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 "vpx_dsp_rtcd.h"
12 #include "vp9_scale.h"
13 #include "vpx_filter.h"
14
scaled_x(int val,const struct scale_factors * sf)15 static INLINE int scaled_x(int val, const struct scale_factors *sf) {
16 return (int)((int64_t)val * sf->x_scale_fp >> REF_SCALE_SHIFT);
17 }
18
scaled_y(int val,const struct scale_factors * sf)19 static INLINE int scaled_y(int val, const struct scale_factors *sf) {
20 return (int)((int64_t)val * sf->y_scale_fp >> REF_SCALE_SHIFT);
21 }
22
unscaled_value(int val,const struct scale_factors * sf)23 static int unscaled_value(int val, const struct scale_factors *sf) {
24 (void)sf;
25 return val;
26 }
27
get_fixed_point_scale_factor(int other_size,int this_size)28 static int get_fixed_point_scale_factor(int other_size, int this_size) {
29 // Calculate scaling factor once for each reference frame
30 // and use fixed point scaling factors in decoding and encoding routines.
31 // Hardware implementations can calculate scale factor in device driver
32 // and use multiplication and shifting on hardware instead of division.
33 return (other_size << REF_SCALE_SHIFT) / this_size;
34 }
35
eb_vp9_scale_mv(const MV * mv,int x,int y,const struct scale_factors * sf)36 MV32 eb_vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf) {
37 const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf) & SUBPEL_MASK;
38 const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf) & SUBPEL_MASK;
39 const MV32 res = { scaled_y(mv->row, sf) + y_off_q4,
40 scaled_x(mv->col, sf) + x_off_q4 };
41 return res;
42 }
43
44 #if CONFIG_VP9_HIGHBITDEPTH
eb_vp9_setup_scale_factors_for_frame(struct scale_factors * sf,int other_w,int other_h,int this_w,int this_h,int use_highbd)45 void eb_vp9_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
46 int other_h, int this_w, int this_h,
47 int use_highbd) {
48 #else
49 void eb_vp9_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
50 int other_h, int this_w, int this_h) {
51 #endif
52 if (!valid_ref_frame_size(other_w, other_h, this_w, this_h)) {
53 sf->x_scale_fp = REF_INVALID_SCALE;
54 sf->y_scale_fp = REF_INVALID_SCALE;
55 return;
56 }
57
58 sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
59 sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
60 sf->x_step_q4 = scaled_x(16, sf);
61 sf->y_step_q4 = scaled_y(16, sf);
62
63 if (vp9_is_scaled(sf)) {
64 sf->scale_value_x = scaled_x;
65 sf->scale_value_y = scaled_y;
66 } else {
67 sf->scale_value_x = unscaled_value;
68 sf->scale_value_y = unscaled_value;
69 }
70
71 // TODO(agrange): Investigate the best choice of functions to use here
72 // for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
73 // to do at full-pel offsets. The current selection, where the filter is
74 // applied in one direction only, and not at all for 0,0, seems to give the
75 // best quality, but it may be worth trying an additional mode that does
76 // do the filtering on full-pel.
77
78 if (sf->x_step_q4 == 16) {
79 if (sf->y_step_q4 == 16) {
80 // No scaling in either direction.
81 sf->predict[0][0][0] = vpx_convolve_copy;
82 sf->predict[0][0][1] = vpx_convolve_avg;
83 sf->predict[0][1][0] = eb_vp9_convolve8_vert;
84 sf->predict[0][1][1] = eb_vp9_convolve8_avg_vert;
85 sf->predict[1][0][0] = eb_vp9_convolve8_horiz;
86 sf->predict[1][0][1] = eb_vp9_convolve8_avg_horiz;
87 } else {
88 #if 0
89 // No scaling in x direction. Must always scale in the y direction.
90 sf->predict[0][0][0] = vpx_scaled_vert;
91 sf->predict[0][0][1] = vpx_scaled_avg_vert;
92 sf->predict[0][1][0] = vpx_scaled_vert;
93 sf->predict[0][1][1] = vpx_scaled_avg_vert;
94 sf->predict[1][0][0] = vpx_scaled_2d;
95 sf->predict[1][0][1] = vpx_scaled_avg_2d;
96 #endif
97 }
98 } else {
99 if (sf->y_step_q4 == 16) {
100 #if 0
101 // No scaling in the y direction. Must always scale in the x direction.
102 sf->predict[0][0][0] = vpx_scaled_horiz;
103 sf->predict[0][0][1] = vpx_scaled_avg_horiz;
104 sf->predict[0][1][0] = vpx_scaled_2d;
105 sf->predict[0][1][1] = vpx_scaled_avg_2d;
106 sf->predict[1][0][0] = vpx_scaled_horiz;
107 sf->predict[1][0][1] = vpx_scaled_avg_horiz;
108 #endif
109 } else {
110 #if 0
111 // Must always scale in both directions.
112 sf->predict[0][0][0] = vpx_scaled_2d;
113 sf->predict[0][0][1] = vpx_scaled_avg_2d;
114 sf->predict[0][1][0] = vpx_scaled_2d;
115 sf->predict[0][1][1] = vpx_scaled_avg_2d;
116 sf->predict[1][0][0] = vpx_scaled_2d;
117 sf->predict[1][0][1] = vpx_scaled_avg_2d;
118 #endif
119 }
120 }
121
122 // 2D subpel motion always gets filtered in both directions
123
124 if ((sf->x_step_q4 != 16) || (sf->y_step_q4 != 16)) {
125 #if 0
126 sf->predict[1][1][0] = vpx_scaled_2d;
127 sf->predict[1][1][1] = vpx_scaled_avg_2d;
128 #endif
129 } else {
130 sf->predict[1][1][0] = eb_vp9_convolve8;
131 sf->predict[1][1][1] = eb_vp9_convolve8_avg;
132 }
133
134 #if CONFIG_VP9_HIGHBITDEPTH
135 if (use_highbd) {
136 if (sf->x_step_q4 == 16) {
137 if (sf->y_step_q4 == 16) {
138 // No scaling in either direction.
139 sf->highbd_predict[0][0][0] = vpx_highbd_convolve_copy;
140 sf->highbd_predict[0][0][1] = vpx_highbd_convolve_avg;
141 sf->highbd_predict[0][1][0] = vpx_highbd_convolve8_vert;
142 sf->highbd_predict[0][1][1] = vpx_highbd_convolve8_avg_vert;
143 sf->highbd_predict[1][0][0] = vpx_highbd_convolve8_horiz;
144 sf->highbd_predict[1][0][1] = vpx_highbd_convolve8_avg_horiz;
145 } else {
146 // No scaling in x direction. Must always scale in the y direction.
147 sf->highbd_predict[0][0][0] = vpx_highbd_convolve8_vert;
148 sf->highbd_predict[0][0][1] = vpx_highbd_convolve8_avg_vert;
149 sf->highbd_predict[0][1][0] = vpx_highbd_convolve8_vert;
150 sf->highbd_predict[0][1][1] = vpx_highbd_convolve8_avg_vert;
151 sf->highbd_predict[1][0][0] = vpx_highbd_convolve8;
152 sf->highbd_predict[1][0][1] = vpx_highbd_convolve8_avg;
153 }
154 } else {
155 if (sf->y_step_q4 == 16) {
156 // No scaling in the y direction. Must always scale in the x direction.
157 sf->highbd_predict[0][0][0] = vpx_highbd_convolve8_horiz;
158 sf->highbd_predict[0][0][1] = vpx_highbd_convolve8_avg_horiz;
159 sf->highbd_predict[0][1][0] = vpx_highbd_convolve8;
160 sf->highbd_predict[0][1][1] = vpx_highbd_convolve8_avg;
161 sf->highbd_predict[1][0][0] = vpx_highbd_convolve8_horiz;
162 sf->highbd_predict[1][0][1] = vpx_highbd_convolve8_avg_horiz;
163 } else {
164 // Must always scale in both directions.
165 sf->highbd_predict[0][0][0] = vpx_highbd_convolve8;
166 sf->highbd_predict[0][0][1] = vpx_highbd_convolve8_avg;
167 sf->highbd_predict[0][1][0] = vpx_highbd_convolve8;
168 sf->highbd_predict[0][1][1] = vpx_highbd_convolve8_avg;
169 sf->highbd_predict[1][0][0] = vpx_highbd_convolve8;
170 sf->highbd_predict[1][0][1] = vpx_highbd_convolve8_avg;
171 }
172 }
173 // 2D subpel motion always gets filtered in both directions.
174 sf->highbd_predict[1][1][0] = vpx_highbd_convolve8;
175 sf->highbd_predict[1][1][1] = vpx_highbd_convolve8_avg;
176 }
177 #endif
178 }
179