chromium/third_party/libaom/source/libaom/av1/encoder/picklpf.c

/*
 * 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 <limits.h>

#include "config/aom_scale_rtcd.h"

#include "aom_dsp/aom_dsp_common.h"
#include "aom_dsp/psnr.h"
#include "aom_mem/aom_mem.h"
#include "aom_ports/mem.h"

#include "av1/common/av1_common_int.h"
#include "av1/common/av1_loopfilter.h"
#include "av1/common/quant_common.h"

#include "av1/encoder/av1_quantize.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/picklpf.h"

// AV1 loop filter applies to the whole frame according to mi_rows and mi_cols,
// which are calculated based on aligned width and aligned height,
// In addition, if super res is enabled, it copies the whole frame
// according to the aligned width and height (av1_superres_upscale()).
// So we need to copy the whole filtered region, instead of the cropped region.
// For example, input image size is: 160x90.
// Then src->y_crop_width = 160, src->y_crop_height = 90.
// The aligned frame size is: src->y_width = 160, src->y_height = 96.
// AV1 aligns frame size to a multiple of 8, if there is
// chroma subsampling, it is able to ensure the chroma is also
// an integer number of mi units. mi unit is 4x4, 8 = 4 * 2, and 2 luma mi
// units correspond to 1 chroma mi unit if there is subsampling.
// See: aom_realloc_frame_buffer() in yv12config.c.
static void yv12_copy_plane(const YV12_BUFFER_CONFIG *src_bc,
                            YV12_BUFFER_CONFIG *dst_bc, int plane) { … }

static int get_max_filter_level(const AV1_COMP *cpi) { … }

static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,
                                AV1_COMP *const cpi, int filt_level,
                                int partial_frame, int plane, int dir) { … }

static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
                               int partial_frame,
                               const int *last_frame_filter_level, int plane,
                               int dir) { … }

void av1_pick_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
                           LPF_PICK_METHOD method) { … }