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1 /* | 1 /* |
2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved. | 2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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26 } | 26 } |
27 | 27 |
28 static int 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 | 29 // Calculate scaling factor once for each reference frame |
30 // and use fixed point scaling factors in decoding and encoding routines. | 30 // and use fixed point scaling factors in decoding and encoding routines. |
31 // Hardware implementations can calculate scale factor in device driver | 31 // Hardware implementations can calculate scale factor in device driver |
32 // and use multiplication and shifting on hardware instead of division. | 32 // and use multiplication and shifting on hardware instead of division. |
33 return (other_size << REF_SCALE_SHIFT) / this_size; | 33 return (other_size << REF_SCALE_SHIFT) / this_size; |
34 } | 34 } |
35 | 35 |
36 static int check_scale_factors(int other_w, int other_h, | |
37 int this_w, int this_h) { | |
38 return 2 * this_w >= other_w && | |
39 2 * this_h >= other_h && | |
40 this_w <= 16 * other_w && | |
41 this_h <= 16 * other_h; | |
42 } | |
43 | |
44 MV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf) { | 36 MV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf) { |
45 const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf) & SUBPEL_MASK; | 37 const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf) & SUBPEL_MASK; |
46 const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf) & SUBPEL_MASK; | 38 const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf) & SUBPEL_MASK; |
47 const MV32 res = { | 39 const MV32 res = { |
48 scaled_y(mv->row, sf) + y_off_q4, | 40 scaled_y(mv->row, sf) + y_off_q4, |
49 scaled_x(mv->col, sf) + x_off_q4 | 41 scaled_x(mv->col, sf) + x_off_q4 |
50 }; | 42 }; |
51 return res; | 43 return res; |
52 } | 44 } |
53 | 45 |
54 void vp9_setup_scale_factors_for_frame(struct scale_factors *sf, | 46 void vp9_setup_scale_factors_for_frame(struct scale_factors *sf, |
55 int other_w, int other_h, | 47 int other_w, int other_h, |
56 int this_w, int this_h) { | 48 int this_w, int this_h) { |
57 if (!check_scale_factors(other_w, other_h, this_w, this_h)) { | 49 if (!valid_ref_frame_size(other_w, other_h, this_w, this_h)) { |
58 sf->x_scale_fp = REF_INVALID_SCALE; | 50 sf->x_scale_fp = REF_INVALID_SCALE; |
59 sf->y_scale_fp = REF_INVALID_SCALE; | 51 sf->y_scale_fp = REF_INVALID_SCALE; |
60 return; | 52 return; |
61 } | 53 } |
62 | 54 |
63 sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w); | 55 sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w); |
64 sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h); | 56 sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h); |
65 sf->x_step_q4 = scaled_x(16, sf); | 57 sf->x_step_q4 = scaled_x(16, sf); |
66 sf->y_step_q4 = scaled_y(16, sf); | 58 sf->y_step_q4 = scaled_y(16, sf); |
67 | 59 |
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113 sf->predict[0][1][0] = vp9_convolve8; | 105 sf->predict[0][1][0] = vp9_convolve8; |
114 sf->predict[0][1][1] = vp9_convolve8_avg; | 106 sf->predict[0][1][1] = vp9_convolve8_avg; |
115 sf->predict[1][0][0] = vp9_convolve8; | 107 sf->predict[1][0][0] = vp9_convolve8; |
116 sf->predict[1][0][1] = vp9_convolve8_avg; | 108 sf->predict[1][0][1] = vp9_convolve8_avg; |
117 } | 109 } |
118 } | 110 } |
119 // 2D subpel motion always gets filtered in both directions | 111 // 2D subpel motion always gets filtered in both directions |
120 sf->predict[1][1][0] = vp9_convolve8; | 112 sf->predict[1][1][0] = vp9_convolve8; |
121 sf->predict[1][1][1] = vp9_convolve8_avg; | 113 sf->predict[1][1][1] = vp9_convolve8_avg; |
122 } | 114 } |
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