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/*
* 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.
*/
#include <assert.h>
#include "./aom_dsp_rtcd.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_ports/mem.h"
void aom_convolve8_neon(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) {
/* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
* maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
*/
DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
// Account for the vertical phase needing 3 lines prior and 4 lines post
int intermediate_height = h + 7;
assert(y_step_q4 == 16);
assert(x_step_q4 == 16);
/* Filter starting 3 lines back. The neon implementation will ignore the
* given height and filter a multiple of 4 lines. Since this goes in to
* the temp buffer which has lots of extra room and is subsequently discarded
* this is safe if somewhat less than ideal.
*/
aom_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, 64, filter_x,
x_step_q4, filter_y, y_step_q4, w,
intermediate_height);
/* Step into the temp buffer 3 lines to get the actual frame data */
aom_convolve8_vert_neon(temp + 64 * 3, 64, dst, dst_stride, filter_x,
x_step_q4, filter_y, y_step_q4, w, h);
}
void aom_convolve8_avg_neon(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) {
DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
int intermediate_height = h + 7;
assert(y_step_q4 == 16);
assert(x_step_q4 == 16);
/* This implementation has the same issues as above. In addition, we only want
* to average the values after both passes.
*/
aom_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, 64, filter_x,
x_step_q4, filter_y, y_step_q4, w,
intermediate_height);
aom_convolve8_avg_vert_neon(temp + 64 * 3, 64, dst, dst_stride, filter_x,
x_step_q4, filter_y, y_step_q4, w, h);
}
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