| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved. |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| |
| #ifndef AOM_AV1_COMMON_SCALE_H_ |
| #define AOM_AV1_COMMON_SCALE_H_ |
| |
| #include "av1/common/convolve.h" |
| #include "av1/common/mv.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #define SCALE_NUMERATOR 8 |
| |
| #define REF_SCALE_SHIFT 14 |
| #define REF_NO_SCALE (1 << REF_SCALE_SHIFT) |
| #define REF_INVALID_SCALE -1 |
| |
| struct scale_factors { |
| int x_scale_fp; // horizontal fixed point scale factor |
| int y_scale_fp; // vertical fixed point scale factor |
| int x_step_q4; |
| int y_step_q4; |
| }; |
| |
| // Note: Expect val to be in q4 precision |
| static INLINE int av1_scaled_x(int val, const struct scale_factors *sf) { |
| const int off = |
| (sf->x_scale_fp - (1 << REF_SCALE_SHIFT)) * (1 << (SUBPEL_BITS - 1)); |
| const int64_t tval = (int64_t)val * sf->x_scale_fp + off; |
| return (int)ROUND_POWER_OF_TWO_SIGNED_64(tval, |
| REF_SCALE_SHIFT - SCALE_EXTRA_BITS); |
| } |
| |
| // Note: Expect val to be in q4 precision |
| static INLINE int av1_scaled_y(int val, const struct scale_factors *sf) { |
| const int off = |
| (sf->y_scale_fp - (1 << REF_SCALE_SHIFT)) * (1 << (SUBPEL_BITS - 1)); |
| const int64_t tval = (int64_t)val * sf->y_scale_fp + off; |
| return (int)ROUND_POWER_OF_TWO_SIGNED_64(tval, |
| REF_SCALE_SHIFT - SCALE_EXTRA_BITS); |
| } |
| |
| // Note: Expect val to be in q4 precision |
| static INLINE int av1_unscaled_value(int val, const struct scale_factors *sf) { |
| (void)sf; |
| return val * (1 << SCALE_EXTRA_BITS); |
| } |
| |
| MV32 av1_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf); |
| |
| void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w, |
| int other_h, int this_w, int this_h); |
| |
| static INLINE int av1_is_valid_scale(const struct scale_factors *sf) { |
| assert(sf != NULL); |
| return sf->x_scale_fp != REF_INVALID_SCALE && |
| sf->y_scale_fp != REF_INVALID_SCALE; |
| } |
| |
| static INLINE int av1_is_scaled(const struct scale_factors *sf) { |
| assert(sf != NULL); |
| return av1_is_valid_scale(sf) && |
| (sf->x_scale_fp != REF_NO_SCALE || sf->y_scale_fp != REF_NO_SCALE); |
| } |
| |
| // See AV1 spec, Section 6.8.6. Frame size with refs semantics. |
| static INLINE int valid_ref_frame_size(int ref_width, int ref_height, |
| int this_width, int this_height) { |
| return 2 * this_width >= ref_width && 2 * this_height >= ref_height && |
| this_width <= 16 * ref_width && this_height <= 16 * ref_height; |
| } |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif // AOM_AV1_COMMON_SCALE_H_ |