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/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Two Orioles, LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "src/cpu.h"
#include "src/looprestoration.h"
#include "common/attributes.h"
#include "common/intops.h"
#include "src/tables.h"
#if BITDEPTH == 8
// This calculates things slightly differently than the reference C version.
// This version calculates roughly this:
// int16_t sum = 0;
// for (int i = 0; i < 7; i++)
// sum += src[idx] * fh[i];
// int16_t sum2 = (src[x] << 7) - (1 << (BITDEPTH + 6)) + rounding_off_h;
// sum = iclip(sum + sum2, INT16_MIN, INT16_MAX) >> round_bits_h;
// sum += 2048;
void dav1d_wiener_filter_h_neon(int16_t *dst, const pixel (*left)[4],
const pixel *src, ptrdiff_t stride,
const int16_t fh[7], const intptr_t w,
int h, enum LrEdgeFlags edges);
// This calculates things slightly differently than the reference C version.
// This version calculates roughly this:
// fv[3] += 128;
// int32_t sum = 0;
// for (int i = 0; i < 7; i++)
// sum += mid[idx] * fv[i];
// sum = (sum + rounding_off_v) >> round_bits_v;
// This function assumes that the width is a multiple of 8.
void dav1d_wiener_filter_v_neon(pixel *dst, ptrdiff_t stride,
const int16_t *mid, int w, int h,
const int16_t fv[7], enum LrEdgeFlags edges,
ptrdiff_t mid_stride);
void dav1d_copy_narrow_neon(pixel *dst, ptrdiff_t stride,
const pixel *src, int w, int h);
static void wiener_filter_neon(pixel *const dst, const ptrdiff_t dst_stride,
const pixel (*const left)[4],
const pixel *lpf, const ptrdiff_t lpf_stride,
const int w, const int h, const int16_t fh[7],
const int16_t fv[7], const enum LrEdgeFlags edges)
{
ALIGN_STK_16(int16_t, mid, 68 * 384,);
int mid_stride = (w + 7) & ~7;
// Horizontal filter
dav1d_wiener_filter_h_neon(&mid[2 * mid_stride], left, dst, dst_stride,
fh, w, h, edges);
if (edges & LR_HAVE_TOP)
dav1d_wiener_filter_h_neon(mid, NULL, lpf, lpf_stride,
fh, w, 2, edges);
if (edges & LR_HAVE_BOTTOM)
dav1d_wiener_filter_h_neon(&mid[(2 + h) * mid_stride], NULL,
lpf + 6 * PXSTRIDE(lpf_stride), lpf_stride,
fh, w, 2, edges);
// Vertical filter
if (w >= 8)
dav1d_wiener_filter_v_neon(dst, dst_stride, &mid[2*mid_stride],
w & ~7, h, fv, edges, mid_stride * sizeof(*mid));
if (w & 7) {
// For uneven widths, do a full 8 pixel wide filtering into a temp
// buffer and copy out the narrow slice of pixels separately into dest.
ALIGN_STK_16(pixel, tmp, 64 * 8,);
dav1d_wiener_filter_v_neon(tmp, w & 7, &mid[2*mid_stride + (w & ~7)],
w & 7, h, fv, edges, mid_stride * sizeof(*mid));
dav1d_copy_narrow_neon(dst + (w & ~7), dst_stride, tmp, w & 7, h);
}
}
#endif
void bitfn(dav1d_loop_restoration_dsp_init_arm)(Dav1dLoopRestorationDSPContext *const c) {
const unsigned flags = dav1d_get_cpu_flags();
if (!(flags & DAV1D_ARM_CPU_FLAG_NEON)) return;
#if BITDEPTH == 8
c->wiener = wiener_filter_neon;
#endif
}
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