ref: 5e1ba6a2d50a232e07366b7337dbe2921bc2af26
dir: /src/cdef_apply.c/
/*
* 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 "config.h"
#include <string.h>
#include "common/intops.h"
#include "src/cdef_apply.h"
static void backup2lines(pixel *const dst[3][2],
/*const*/ pixel *const src[3],
const ptrdiff_t src_stride[2], int y_off, int w,
const enum Dav1dPixelLayout layout)
{
pixel_copy(dst[0][0], src[0] + (y_off - 2) * PXSTRIDE(src_stride[0]), w);
pixel_copy(dst[0][1], src[0] + (y_off - 1) * PXSTRIDE(src_stride[0]), w);
if (layout == DAV1D_PIXEL_LAYOUT_I400) return;
const int ss_ver = layout == DAV1D_PIXEL_LAYOUT_I420;
const int ss_hor = layout != DAV1D_PIXEL_LAYOUT_I444;
w >>= ss_hor;
y_off >>= ss_ver;
pixel_copy(dst[1][0], src[1] + (y_off - 2) * PXSTRIDE(src_stride[1]), w);
pixel_copy(dst[1][1], src[1] + (y_off - 1) * PXSTRIDE(src_stride[1]), w);
pixel_copy(dst[2][0], src[2] + (y_off - 2) * PXSTRIDE(src_stride[1]), w);
pixel_copy(dst[2][1], src[2] + (y_off - 1) * PXSTRIDE(src_stride[1]), w);
}
static void backup2x8(pixel dst[3][8][2],
/*const*/ pixel *const src[3],
const ptrdiff_t src_stride[2], int x_off,
const enum Dav1dPixelLayout layout)
{
for (int y = 0, y_off = 0; y < 8; y++, y_off += PXSTRIDE(src_stride[0]))
pixel_copy(dst[0][y], &src[0][y_off + x_off - 2], 2);
if (layout == DAV1D_PIXEL_LAYOUT_I400) return;
const int ss_ver = layout == DAV1D_PIXEL_LAYOUT_I420;
const int ss_hor = layout != DAV1D_PIXEL_LAYOUT_I444;
x_off >>= ss_hor;
for (int y = 0, y_off = 0; y < (8 >> ss_ver); y++, y_off += PXSTRIDE(src_stride[1])) {
pixel_copy(dst[1][y], &src[1][y_off + x_off - 2], 2);
pixel_copy(dst[2][y], &src[2][y_off + x_off - 2], 2);
}
}
static void restore2x8(pixel *const dst[3],
const ptrdiff_t dst_stride[2],
const pixel src[3][8][2], const enum Dav1dPixelLayout layout)
{
for (int y = 0, y_off = 0; y < 8; y++, y_off += PXSTRIDE(dst_stride[0]))
pixel_copy(&dst[0][y_off - 2], src[0][y], 2);
if (layout == DAV1D_PIXEL_LAYOUT_I400) return;
const int ss_ver = layout == DAV1D_PIXEL_LAYOUT_I420;
for (int y = 0, y_off = 0; y < (8 >> ss_ver); y++, y_off += PXSTRIDE(dst_stride[1])) {
pixel_copy(&dst[1][y_off - 2], src[1][y], 2);
pixel_copy(&dst[2][y_off - 2], src[2][y], 2);
}
}
static int adjust_strength(const int strength, const unsigned var) {
if (!var) return 0;
const int i = var >> 6 ? imin(ulog2(var >> 6), 12) : 0;
return (strength * (4 + i) + 8) >> 4;
}
void bytefn(dav1d_cdef_brow)(Dav1dFrameContext *const f,
pixel *const p[3],
const Av1Filter *const lflvl,
const int by_start, const int by_end)
{
const Dav1dDSPContext *const dsp = f->dsp;
enum CdefEdgeFlags edges = HAVE_BOTTOM | (by_start > 0 ? HAVE_TOP : 0);
pixel *ptrs[3] = { p[0], p[1], p[2] };
const int sbsz = 16;
const int sb64w = f->sb128w << 1;
const int damping = f->frame_hdr.cdef.damping + BITDEPTH - 8;
const enum Dav1dPixelLayout layout = f->cur.p.p.layout;
const int uv_idx = DAV1D_PIXEL_LAYOUT_I444 - layout;
const int has_chroma = layout != DAV1D_PIXEL_LAYOUT_I400;
const int ss_ver = layout == DAV1D_PIXEL_LAYOUT_I420;
const int ss_hor = layout != DAV1D_PIXEL_LAYOUT_I444;
// FIXME a design improvement that could be made here is to keep a set of
// flags for each block position on whether the block was filtered; if not,
// the backup of pre-filter data is empty, and the restore is therefore
// unnecessary as well.
for (int by = by_start; by < by_end; by += 2, edges |= HAVE_TOP) {
const int tf = f->lf.top_pre_cdef_toggle;
if (by + 2 >= f->bh) edges &= ~HAVE_BOTTOM;
if (edges & HAVE_BOTTOM) {
// backup pre-filter data for next iteration
backup2lines(f->lf.cdef_line_ptr[!tf], ptrs, f->cur.p.stride,
8, f->bw * 4, layout);
}
pixel lr_bak[2 /* idx */][3 /* plane */][8 /* y */][2 /* x */];
pixel *iptrs[3] = { ptrs[0], ptrs[1], ptrs[2] };
edges &= ~HAVE_LEFT;
edges |= HAVE_RIGHT;
for (int sbx = 0, last_skip = 1; sbx < sb64w; sbx++, edges |= HAVE_LEFT) {
const int sb128x = sbx >>1;
const int sb64_idx = ((by & sbsz) >> 3) + (sbx & 1);
const int cdef_idx = lflvl[sb128x].cdef_idx[sb64_idx];
if (cdef_idx == -1 ||
(!f->frame_hdr.cdef.y_strength[cdef_idx] &&
!f->frame_hdr.cdef.uv_strength[cdef_idx]))
{
last_skip = 1;
goto next_sb;
}
const int y_lvl = f->frame_hdr.cdef.y_strength[cdef_idx];
const int uv_lvl = f->frame_hdr.cdef.uv_strength[cdef_idx];
pixel *bptrs[3] = { iptrs[0], iptrs[1], iptrs[2] };
for (int bx = sbx * sbsz; bx < imin((sbx + 1) * sbsz, f->bw);
bx += 2, edges |= HAVE_LEFT)
{
if (bx + 2 >= f->bw) edges &= ~HAVE_RIGHT;
// check if this 8x8 block had any coded coefficients; if not,
// go to the next block
const unsigned bx_mask = 3U << (bx & 30);
const int by_idx = by & 30;
if (!((lflvl[sb128x].noskip_mask[by_idx + 0] |
lflvl[sb128x].noskip_mask[by_idx + 1]) & bx_mask))
{
last_skip = 1;
goto next_b;
}
if (!last_skip) {
// backup post-filter data (will be restored at the end)
backup2x8(lr_bak[1], bptrs, f->cur.p.stride, 0, layout);
// restore pre-filter data from last iteration
restore2x8(bptrs, f->cur.p.stride, lr_bak[0], layout);
}
if (edges & HAVE_RIGHT) {
// backup pre-filter data for next iteration
backup2x8(lr_bak[0], bptrs, f->cur.p.stride, 8, layout);
}
// the actual filter
const int y_pri_lvl = (y_lvl >> 2) << (BITDEPTH - 8);
int y_sec_lvl = y_lvl & 3;
y_sec_lvl += y_sec_lvl == 3;
y_sec_lvl <<= BITDEPTH - 8;
const int uv_pri_lvl = (uv_lvl >> 2) << (BITDEPTH - 8);
int uv_sec_lvl = uv_lvl & 3;
uv_sec_lvl += uv_sec_lvl == 3;
uv_sec_lvl <<= BITDEPTH - 8;
unsigned variance;
const int dir = dsp->cdef.dir(bptrs[0], f->cur.p.stride[0],
&variance);
if (y_lvl) {
dsp->cdef.fb[0](bptrs[0], f->cur.p.stride[0],
(pixel *const [2]) {
&f->lf.cdef_line_ptr[tf][0][0][bx * 4],
&f->lf.cdef_line_ptr[tf][0][1][bx * 4],
},
adjust_strength(y_pri_lvl, variance),
y_sec_lvl, y_pri_lvl ? dir : 0,
damping, edges);
}
if (uv_lvl && has_chroma) {
const int uvdir =
f->cur.p.p.layout != DAV1D_PIXEL_LAYOUT_I422 ? dir :
((uint8_t[]) { 7, 0, 2, 4, 5, 6, 6, 6 })[dir];
for (int pl = 1; pl <= 2; pl++) {
dsp->cdef.fb[uv_idx](bptrs[pl], f->cur.p.stride[1],
(pixel *const [2]) {
&f->lf.cdef_line_ptr[tf][pl][0][bx * 4 >> ss_hor],
&f->lf.cdef_line_ptr[tf][pl][1][bx * 4 >> ss_hor],
},
uv_pri_lvl, uv_sec_lvl,
uv_pri_lvl ? uvdir : 0,
damping - 1, edges);
}
}
if (!last_skip) {
// restore post-filter data from the beginning of this loop
restore2x8(bptrs, f->cur.p.stride, lr_bak[1], layout);
}
last_skip = 0;
next_b:
bptrs[0] += 8;
bptrs[1] += 8 >> ss_hor;
bptrs[2] += 8 >> ss_hor;
}
next_sb:
iptrs[0] += sbsz * 4;
iptrs[1] += sbsz * 4 >> ss_hor;
iptrs[2] += sbsz * 4 >> ss_hor;
}
ptrs[0] += 8 * PXSTRIDE(f->cur.p.stride[0]);
ptrs[1] += 8 * PXSTRIDE(f->cur.p.stride[1]) >> ss_ver;
ptrs[2] += 8 * PXSTRIDE(f->cur.p.stride[1]) >> ss_ver;
f->lf.top_pre_cdef_toggle ^= 1;
}
}