58 строки
2.3 KiB
C
58 строки
2.3 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_DSP_AOM_CONVOLVE_H_
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#define AOM_DSP_AOM_CONVOLVE_H_
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#include "./aom_config.h"
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#include "aom/aom_integer.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Note: Fixed size intermediate buffers, place limits on parameters
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// of some functions. 2d filtering proceeds in 2 steps:
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// (1) Interpolate horizontally into an intermediate buffer, temp.
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// (2) Interpolate temp vertically to derive the sub-pixel result.
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// Deriving the maximum number of rows in the temp buffer (135):
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// --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative).
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// --Largest block size is 64x64 pixels.
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// --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
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// original frame (in 1/16th pixel units).
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// --Must round-up because block may be located at sub-pixel position.
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// --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
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// --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
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#if CONFIG_AV1 && CONFIG_EXT_PARTITION
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#define MAX_EXT_SIZE 263
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#else
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#define MAX_EXT_SIZE 135
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#endif // CONFIG_AV1 && CONFIG_EXT_PARTITION
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typedef void (*convolve_fn_t)(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const int16_t *filter_x, int x_step_q4,
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const int16_t *filter_y, int y_step_q4, int w,
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int h);
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#if CONFIG_AOM_HIGHBITDEPTH
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typedef void (*highbd_convolve_fn_t)(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const int16_t *filter_x, int x_step_q4,
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const int16_t *filter_y, int y_step_q4,
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int w, int h, int bd);
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#endif
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AOM_DSP_AOM_CONVOLVE_H_
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