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// Copyright 2020 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/post_filter.h"
#include "src/utils/blocking_counter.h"
namespace libgav1 {
template <typename Pixel>
void PostFilter::ApplyLoopRestorationForOneRow(
const Pixel* src_buffer, const ptrdiff_t stride, const Plane plane,
const int plane_height, const int plane_width, const int unit_y,
const int unit_row, const int current_process_unit_height,
const int plane_unit_size, Pixel* dst_buffer) {
const int num_horizontal_units =
restoration_info_->num_horizontal_units(static_cast<Plane>(plane));
const RestorationUnitInfo* const restoration_info =
restoration_info_->loop_restoration_info(static_cast<Plane>(plane),
unit_row * num_horizontal_units);
const bool in_place = DoCdef() || thread_pool_ != nullptr;
const Pixel* border = nullptr;
ptrdiff_t border_stride = 0;
src_buffer += unit_y * stride;
if (in_place) {
const int border_unit_y = std::max(
RightShiftWithCeiling(unit_y, 4 - subsampling_y_[plane]) - 4, 0);
border_stride = loop_restoration_border_.stride(plane) / sizeof(Pixel);
border =
reinterpret_cast<const Pixel*>(loop_restoration_border_.data(plane)) +
border_unit_y * border_stride;
}
int unit_column = 0;
int column = 0;
do {
const int current_process_unit_width =
std::min(plane_unit_size, plane_width - column);
const Pixel* src = src_buffer + column;
unit_column = std::min(unit_column, num_horizontal_units - 1);
if (restoration_info[unit_column].type == kLoopRestorationTypeNone) {
Pixel* dst = dst_buffer + column;
if (in_place) {
int k = current_process_unit_height;
do {
memmove(dst, src, current_process_unit_width * sizeof(Pixel));
src += stride;
dst += stride;
} while (--k != 0);
} else {
CopyPlane(src, stride, current_process_unit_width,
current_process_unit_height, dst, stride);
}
} else {
const Pixel* top_border = src - kRestorationVerticalBorder * stride;
ptrdiff_t top_border_stride = stride;
const Pixel* bottom_border = src + current_process_unit_height * stride;
ptrdiff_t bottom_border_stride = stride;
const bool frame_bottom_border =
(unit_y + current_process_unit_height >= plane_height);
if (in_place && (unit_y != 0 || !frame_bottom_border)) {
const Pixel* loop_restoration_border = border + column;
if (unit_y != 0) {
top_border = loop_restoration_border;
top_border_stride = border_stride;
loop_restoration_border += 4 * border_stride;
}
if (!frame_bottom_border) {
bottom_border = loop_restoration_border +
kRestorationVerticalBorder * border_stride;
bottom_border_stride = border_stride;
}
}
RestorationBuffer restoration_buffer;
const LoopRestorationType type = restoration_info[unit_column].type;
assert(type == kLoopRestorationTypeSgrProj ||
type == kLoopRestorationTypeWiener);
const dsp::LoopRestorationFunc restoration_func =
dsp_.loop_restorations[type - 2];
restoration_func(restoration_info[unit_column], src, stride, top_border,
top_border_stride, bottom_border, bottom_border_stride,
current_process_unit_width, current_process_unit_height,
&restoration_buffer, dst_buffer + column);
}
++unit_column;
column += plane_unit_size;
} while (column < plane_width);
}
template <typename Pixel>
void PostFilter::ApplyLoopRestorationForOneSuperBlockRow(const int row4x4_start,
const int sb4x4) {
assert(row4x4_start >= 0);
assert(DoRestoration());
int plane = kPlaneY;
const int upscaled_width = frame_header_.upscaled_width;
const int height = frame_header_.height;
do {
if (loop_restoration_.type[plane] == kLoopRestorationTypeNone) {
continue;
}
const ptrdiff_t stride = frame_buffer_.stride(plane) / sizeof(Pixel);
const int unit_height_offset =
kRestorationUnitOffset >> subsampling_y_[plane];
const int plane_height = SubsampledValue(height, subsampling_y_[plane]);
const int plane_width =
SubsampledValue(upscaled_width, subsampling_x_[plane]);
const int plane_unit_size = 1 << loop_restoration_.unit_size_log2[plane];
const int plane_process_unit_height =
kRestorationUnitHeight >> subsampling_y_[plane];
int y = (row4x4_start == 0)
? 0
: (MultiplyBy4(row4x4_start) >> subsampling_y_[plane]) -
unit_height_offset;
int expected_height = plane_process_unit_height -
((row4x4_start == 0) ? unit_height_offset : 0);
int current_process_unit_height;
for (int sb_y = 0; sb_y < sb4x4;
sb_y += 16, y += current_process_unit_height) {
if (y >= plane_height) break;
const int unit_row = std::min(
(y + unit_height_offset) >> loop_restoration_.unit_size_log2[plane],
restoration_info_->num_vertical_units(static_cast<Plane>(plane)) - 1);
current_process_unit_height = std::min(expected_height, plane_height - y);
expected_height = plane_process_unit_height;
ApplyLoopRestorationForOneRow<Pixel>(
reinterpret_cast<Pixel*>(superres_buffer_[plane]), stride,
static_cast<Plane>(plane), plane_height, plane_width, y, unit_row,
current_process_unit_height, plane_unit_size,
reinterpret_cast<Pixel*>(loop_restoration_buffer_[plane]) +
y * stride);
}
} while (++plane < planes_);
}
void PostFilter::ApplyLoopRestoration(const int row4x4_start, const int sb4x4) {
#if LIBGAV1_MAX_BITDEPTH >= 10
if (bitdepth_ >= 10) {
ApplyLoopRestorationForOneSuperBlockRow<uint16_t>(row4x4_start, sb4x4);
return;
}
#endif
ApplyLoopRestorationForOneSuperBlockRow<uint8_t>(row4x4_start, sb4x4);
}
void PostFilter::ApplyLoopRestorationWorker(std::atomic<int>* row4x4_atomic) {
int row4x4;
// Loop Restoration operates with a lag of 8 rows (4 for chroma with
// subsampling) and hence we need to make sure to cover the last 8 rows of the
// last superblock row. So we run this loop for an extra iteration to
// accomplish that.
const int row4x4_end = frame_header_.rows4x4 + kNum4x4InLoopRestorationUnit;
while ((row4x4 = row4x4_atomic->fetch_add(kNum4x4InLoopRestorationUnit,
std::memory_order_relaxed)) <
row4x4_end) {
CopyBordersForOneSuperBlockRow(row4x4, kNum4x4InLoopRestorationUnit,
/*for_loop_restoration=*/true);
#if LIBGAV1_MAX_BITDEPTH >= 10
if (bitdepth_ >= 10) {
ApplyLoopRestorationForOneSuperBlockRow<uint16_t>(
row4x4, kNum4x4InLoopRestorationUnit);
continue;
}
#endif
ApplyLoopRestorationForOneSuperBlockRow<uint8_t>(
row4x4, kNum4x4InLoopRestorationUnit);
}
}
} // namespace libgav1
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