| /* |
| * Copyright (c) 2021, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 3-Clause Clear License |
| * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear |
| * License was not distributed with this source code in the LICENSE file, you |
| * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. 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 |
| * aomedia.org/license/patent-license/. |
| */ |
| |
| #include <assert.h> |
| #include <string.h> |
| |
| #include "config/aom_config.h" |
| #include "config/aom_dsp_rtcd.h" |
| |
| #include "aom/aom_integer.h" |
| #include "aom_dsp/aom_dsp_common.h" |
| #include "aom_dsp/aom_filter.h" |
| #include "aom_ports/mem.h" |
| |
| static const InterpKernel *get_filter_base(const int16_t *filter) { |
| // NOTE: This assumes that the filter table is 256-byte aligned. |
| return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF)); |
| } |
| |
| static int get_filter_offset(const int16_t *f, const InterpKernel *base) { |
| return (int)((const InterpKernel *)(intptr_t)f - base); |
| } |
| |
| static INLINE int highbd_vert_scalar_product(const uint16_t *a, |
| ptrdiff_t a_stride, |
| const int16_t *b) { |
| int sum = 0; |
| for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k * a_stride] * b[k]; |
| return sum; |
| } |
| |
| static INLINE int highbd_horz_scalar_product(const uint16_t *a, |
| const int16_t *b) { |
| int sum = 0; |
| for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k] * b[k]; |
| return sum; |
| } |
| |
| static void highbd_convolve_horiz(const uint16_t *src, ptrdiff_t src_stride, |
| uint16_t *dst, ptrdiff_t dst_stride, |
| const InterpKernel *x_filters, int x0_q4, |
| int x_step_q4, int w, int h, int bd) { |
| src -= SUBPEL_TAPS / 2 - 1; |
| for (int y = 0; y < h; ++y) { |
| int x_q4 = x0_q4; |
| for (int x = 0; x < w; ++x) { |
| const uint16_t *const src_x = &src[x_q4 >> SUBPEL_BITS]; |
| const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK]; |
| const int sum = highbd_horz_scalar_product(src_x, x_filter); |
| dst[x] = clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd); |
| x_q4 += x_step_q4; |
| } |
| src += src_stride; |
| dst += dst_stride; |
| } |
| } |
| |
| static void highbd_convolve_vert(const uint16_t *src, ptrdiff_t src_stride, |
| uint16_t *dst, ptrdiff_t dst_stride, |
| const InterpKernel *y_filters, int y0_q4, |
| int y_step_q4, int w, int h, int bd) { |
| src -= src_stride * (SUBPEL_TAPS / 2 - 1); |
| for (int x = 0; x < w; ++x) { |
| int y_q4 = y0_q4; |
| for (int y = 0; y < h; ++y) { |
| const uint16_t *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride]; |
| const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK]; |
| const int sum = highbd_vert_scalar_product(src_y, src_stride, y_filter); |
| dst[y * dst_stride] = |
| clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd); |
| y_q4 += y_step_q4; |
| } |
| ++src; |
| ++dst; |
| } |
| } |
| |
| void aom_highbd_convolve8_c(const uint16_t *src, ptrdiff_t src_stride, |
| uint16_t *dst, ptrdiff_t dst_stride, |
| const InterpKernel *filter, int x0_q4, |
| int x_step_q4, int y0_q4, int y_step_q4, int w, |
| int h, int bd) { |
| // Note: Fixed size intermediate buffer, temp, places limits on parameters. |
| // 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. |
| // When calling in frame scaling function, the smallest scaling factor is x1/4 |
| // ==> y_step_q4 = 64. Since w and h are at most 16, the temp buffer is still |
| // big enough. |
| uint16_t temp[64 * 135]; |
| const int intermediate_height = |
| (((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS; |
| |
| assert(w <= 64); |
| assert(h <= 64); |
| assert(y_step_q4 <= 32 || (y_step_q4 <= 64 && h <= 32)); |
| assert(x_step_q4 <= 64); |
| |
| highbd_convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, |
| temp, 64, filter, x0_q4, x_step_q4, w, |
| intermediate_height, bd); |
| highbd_convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride, |
| filter, y0_q4, y_step_q4, w, h, bd); |
| } |
| |
| void aom_convolve_copy_c(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, |
| ptrdiff_t dst_stride, int w, int h) { |
| for (int r = h; r > 0; --r) { |
| memmove(dst, src, w); |
| src += src_stride; |
| dst += dst_stride; |
| } |
| } |
| |
| void aom_highbd_convolve8_horiz_c(const uint8_t *src8, ptrdiff_t src_stride, |
| uint8_t *dst8, 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) { |
| uint16_t *src = CONVERT_TO_SHORTPTR(src8); |
| uint16_t *dst = CONVERT_TO_SHORTPTR(dst8); |
| const InterpKernel *const filters_x = get_filter_base(filter_x); |
| const int x0_q4 = get_filter_offset(filter_x, filters_x); |
| (void)filter_y; |
| (void)y_step_q4; |
| |
| highbd_convolve_horiz(src, src_stride, dst, dst_stride, filters_x, x0_q4, |
| x_step_q4, w, h, bd); |
| } |
| |
| void aom_highbd_convolve8_vert_c(const uint8_t *src8, ptrdiff_t src_stride, |
| uint8_t *dst8, 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) { |
| uint16_t *src = CONVERT_TO_SHORTPTR(src8); |
| uint16_t *dst = CONVERT_TO_SHORTPTR(dst8); |
| const InterpKernel *const filters_y = get_filter_base(filter_y); |
| const int y0_q4 = get_filter_offset(filter_y, filters_y); |
| (void)filter_x; |
| (void)x_step_q4; |
| |
| highbd_convolve_vert(src, src_stride, dst, dst_stride, filters_y, y0_q4, |
| y_step_q4, w, h, bd); |
| } |
| |
| void aom_highbd_convolve_copy_c(const uint16_t *src, ptrdiff_t src_stride, |
| uint16_t *dst, ptrdiff_t dst_stride, int w, |
| int h) { |
| for (int y = 0; y < h; ++y) { |
| memmove(dst, src, w * sizeof(src[0])); |
| src += src_stride; |
| dst += dst_stride; |
| } |
| } |