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