65 lines
2.7 KiB
C
65 lines
2.7 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <assert.h>
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#include "./vpx_dsp_rtcd.h"
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#include "vpx_dsp/vpx_dsp_common.h"
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#include "vpx_ports/mem.h"
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void vpx_convolve8_neon(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
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ptrdiff_t dst_stride, const int16_t *filter_x,
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int x_step_q4, const int16_t *filter_y, int y_step_q4,
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int w, int h) {
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/* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
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* maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
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*/
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DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
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// Account for the vertical phase needing 3 lines prior and 4 lines post
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const int intermediate_height = h + 7;
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assert(y_step_q4 == 16);
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assert(x_step_q4 == 16);
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/* Filter starting 3 lines back. The neon implementation will ignore the given
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* height and filter a multiple of 4 lines. Since this goes in to the temp
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* buffer which has lots of extra room and is subsequently discarded this is
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* safe if somewhat less than ideal. */
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vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, w, filter_x,
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x_step_q4, filter_y, y_step_q4, w,
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intermediate_height);
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/* Step into the temp buffer 3 lines to get the actual frame data */
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vpx_convolve8_vert_neon(temp + w * 3, w, dst, dst_stride, filter_x, x_step_q4,
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filter_y, y_step_q4, w, h);
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}
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void vpx_convolve8_avg_neon(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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DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
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const int intermediate_height = h + 7;
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assert(y_step_q4 == 16);
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assert(x_step_q4 == 16);
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/* This implementation has the same issues as above. In addition, we only want
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* to average the values after both passes.
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*/
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vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, w, filter_x,
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x_step_q4, filter_y, y_step_q4, w,
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intermediate_height);
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vpx_convolve8_avg_vert_neon(temp + w * 3, w, dst, dst_stride, filter_x,
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x_step_q4, filter_y, y_step_q4, w, h);
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}
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