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