/src/aom/av1/common/scale.c
Line | Count | Source (jump to first uncovered line) |
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 "config/aom_dsp_rtcd.h" |
13 | | #include "config/av1_rtcd.h" |
14 | | |
15 | | #include "av1/common/filter.h" |
16 | | #include "av1/common/scale.h" |
17 | | #include "aom_dsp/aom_filter.h" |
18 | | |
19 | | // Note: Expect val to be in q4 precision |
20 | 0 | static INLINE int scaled_x(int val, const struct scale_factors *sf) { |
21 | 0 | const int off = |
22 | 0 | (sf->x_scale_fp - (1 << REF_SCALE_SHIFT)) * (1 << (SUBPEL_BITS - 1)); |
23 | 0 | const int64_t tval = (int64_t)val * sf->x_scale_fp + off; |
24 | 0 | return (int)ROUND_POWER_OF_TWO_SIGNED_64(tval, |
25 | 0 | REF_SCALE_SHIFT - SCALE_EXTRA_BITS); |
26 | 0 | } |
27 | | |
28 | | // Note: Expect val to be in q4 precision |
29 | 0 | static INLINE int scaled_y(int val, const struct scale_factors *sf) { |
30 | 0 | const int off = |
31 | 0 | (sf->y_scale_fp - (1 << REF_SCALE_SHIFT)) * (1 << (SUBPEL_BITS - 1)); |
32 | 0 | const int64_t tval = (int64_t)val * sf->y_scale_fp + off; |
33 | 0 | return (int)ROUND_POWER_OF_TWO_SIGNED_64(tval, |
34 | 0 | REF_SCALE_SHIFT - SCALE_EXTRA_BITS); |
35 | 0 | } |
36 | | |
37 | | // Note: Expect val to be in q4 precision |
38 | 0 | static int unscaled_value(int val, const struct scale_factors *sf) { |
39 | 0 | (void)sf; |
40 | 0 | return val * (1 << SCALE_EXTRA_BITS); |
41 | 0 | } |
42 | | |
43 | 5.52k | static int get_fixed_point_scale_factor(int other_size, int this_size) { |
44 | | // Calculate scaling factor once for each reference frame |
45 | | // and use fixed point scaling factors in decoding and encoding routines. |
46 | | // Hardware implementations can calculate scale factor in device driver |
47 | | // and use multiplication and shifting on hardware instead of division. |
48 | 5.52k | return ((other_size << REF_SCALE_SHIFT) + this_size / 2) / this_size; |
49 | 5.52k | } |
50 | | |
51 | | // Given the fixed point scale, calculate coarse point scale. |
52 | 5.52k | static int fixed_point_scale_to_coarse_point_scale(int scale_fp) { |
53 | 5.52k | return ROUND_POWER_OF_TWO(scale_fp, REF_SCALE_SHIFT - SCALE_SUBPEL_BITS); |
54 | 5.52k | } |
55 | | |
56 | | // Note: x and y are integer precision, mvq4 is q4 precision. |
57 | | MV32 av1_scale_mv(const MV *mvq4, int x, int y, |
58 | 0 | const struct scale_factors *sf) { |
59 | 0 | const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf); |
60 | 0 | const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf); |
61 | 0 | const MV32 res = { scaled_y((y << SUBPEL_BITS) + mvq4->row, sf) - y_off_q4, |
62 | 0 | scaled_x((x << SUBPEL_BITS) + mvq4->col, sf) - x_off_q4 }; |
63 | 0 | return res; |
64 | 0 | } |
65 | | |
66 | | void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w, |
67 | 2.76k | int other_h, int this_w, int this_h) { |
68 | 2.76k | if (!valid_ref_frame_size(other_w, other_h, this_w, this_h)) { |
69 | 0 | sf->x_scale_fp = REF_INVALID_SCALE; |
70 | 0 | sf->y_scale_fp = REF_INVALID_SCALE; |
71 | 0 | return; |
72 | 0 | } |
73 | | |
74 | 2.76k | sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w); |
75 | 2.76k | sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h); |
76 | | |
77 | 2.76k | sf->x_step_q4 = fixed_point_scale_to_coarse_point_scale(sf->x_scale_fp); |
78 | 2.76k | sf->y_step_q4 = fixed_point_scale_to_coarse_point_scale(sf->y_scale_fp); |
79 | | |
80 | 2.76k | if (av1_is_scaled(sf)) { |
81 | 0 | sf->scale_value_x = scaled_x; |
82 | 0 | sf->scale_value_y = scaled_y; |
83 | 2.76k | } else { |
84 | 2.76k | sf->scale_value_x = unscaled_value; |
85 | 2.76k | sf->scale_value_y = unscaled_value; |
86 | 2.76k | } |
87 | 2.76k | } |