av1/common/restoration.h - aom - Git at Google

 /*
  * 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.
  */

 #ifndef AV1_COMMON_RESTORATION_H_
 #define AV1_COMMON_RESTORATION_H_

 #include "aom_ports/mem.h"
 #include "config/aom_config.h"

 #include "av1/common/blockd.h"
 #include "av1/common/enums.h"

 #ifdef __cplusplus
 extern "C" {
 #endif

 #define CLIP(x, lo, hi) ((x) < (lo) ? (lo) : (x) > (hi) ? (hi) : (x))
 #define RINT(x) ((x) < 0 ? (int)((x)-0.5) : (int)((x) + 0.5))

 #define RESTORATION_PROC_UNIT_SIZE 64

 // Filter tile grid offset upwards compared to the superblock grid
 #define RESTORATION_UNIT_OFFSET 8

 #define SGRPROJ_BORDER_VERT 3  // Vertical border used for Sgr
 #define SGRPROJ_BORDER_HORZ 3  // Horizontal border used for Sgr

 #define WIENER_BORDER_VERT 2  // Vertical border used for Wiener
 #define WIENER_HALFWIN 3
 #define WIENER_BORDER_HORZ (WIENER_HALFWIN)  // Horizontal border for Wiener

 // RESTORATION_BORDER_VERT determines line buffer requirement for LR.
 // Should be set at the max of SGRPROJ_BORDER_VERT and WIENER_BORDER_VERT.
 // Note the line buffer needed is twice the value of this macro.
 #if SGRPROJ_BORDER_VERT >= WIENER_BORDER_VERT
 #define RESTORATION_BORDER_VERT (SGRPROJ_BORDER_VERT)
 #else
 #define RESTORATION_BORDER_VERT (WIENER_BORDER_VERT)
 #endif  // SGRPROJ_BORDER_VERT >= WIENER_BORDER_VERT

 #if SGRPROJ_BORDER_HORZ >= WIENER_BORDER_HORZ
 #define RESTORATION_BORDER_HORZ (SGRPROJ_BORDER_HORZ)
 #else
 #define RESTORATION_BORDER_HORZ (WIENER_BORDER_HORZ)
 #endif  // SGRPROJ_BORDER_VERT >= WIENER_BORDER_VERT

 // How many border pixels do we need for each processing unit?
 #define RESTORATION_BORDER 3

 // How many rows of deblocked pixels do we save above/below each processing
 // stripe?
 #define RESTORATION_CTX_VERT 2

 // Additional pixels to the left and right in above/below buffers
 // It is RESTORATION_BORDER_HORZ rounded up to get nicer buffer alignment
 #define RESTORATION_EXTRA_HORZ 4

 // Pad up to 20 more (may be much less is needed)
 #define RESTORATION_PADDING 20
 #define RESTORATION_PROC_UNIT_PELS                             \
   ((RESTORATION_PROC_UNIT_SIZE + RESTORATION_BORDER_HORZ * 2 + \
     RESTORATION_PADDING) *                                     \
    (RESTORATION_PROC_UNIT_SIZE + RESTORATION_BORDER_VERT * 2 + \
     RESTORATION_PADDING))

 #define RESTORATION_UNITSIZE_MAX 256
 #define RESTORATION_UNITPELS_HORZ_MAX \
   (RESTORATION_UNITSIZE_MAX * 3 / 2 + 2 * RESTORATION_BORDER_HORZ + 16)
 #define RESTORATION_UNITPELS_VERT_MAX                                \
   ((RESTORATION_UNITSIZE_MAX * 3 / 2 + 2 * RESTORATION_BORDER_VERT + \
     RESTORATION_UNIT_OFFSET))
 #define RESTORATION_UNITPELS_MAX \
   (RESTORATION_UNITPELS_HORZ_MAX * RESTORATION_UNITPELS_VERT_MAX)

 // Two 32-bit buffers needed for the restored versions from two filters
 // TODO(debargha, rupert): Refactor to not need the large tilesize to be stored
 // on the decoder side.
 #define SGRPROJ_TMPBUF_SIZE (RESTORATION_UNITPELS_MAX * 2 * sizeof(int32_t))

 #define SGRPROJ_EXTBUF_SIZE (0)
 #define SGRPROJ_PARAMS_BITS 4
 #define SGRPROJ_PARAMS (1 << SGRPROJ_PARAMS_BITS)

 // Precision bits for projection
 #define SGRPROJ_PRJ_BITS 7
 // Restoration precision bits generated higher than source before projection
 #define SGRPROJ_RST_BITS 4
 // Internal precision bits for core selfguided_restoration
 #define SGRPROJ_SGR_BITS 8
 #define SGRPROJ_SGR (1 << SGRPROJ_SGR_BITS)

 #define SGRPROJ_PRJ_MIN0 (-(1 << SGRPROJ_PRJ_BITS) * 3 / 4)
 #define SGRPROJ_PRJ_MAX0 (SGRPROJ_PRJ_MIN0 + (1 << SGRPROJ_PRJ_BITS) - 1)
 #define SGRPROJ_PRJ_MIN1 (-(1 << SGRPROJ_PRJ_BITS) / 4)
 #define SGRPROJ_PRJ_MAX1 (SGRPROJ_PRJ_MIN1 + (1 << SGRPROJ_PRJ_BITS) - 1)

 #define SGRPROJ_PRJ_SUBEXP_K 4

 #define SGRPROJ_BITS (SGRPROJ_PRJ_BITS * 2 + SGRPROJ_PARAMS_BITS)

 #define MAX_RADIUS 2  // Only 1, 2, 3 allowed
 #define MAX_NELEM ((2 * MAX_RADIUS + 1) * (2 * MAX_RADIUS + 1))
 #define SGRPROJ_MTABLE_BITS 20
 #define SGRPROJ_RECIP_BITS 12

 #define WIENER_HALFWIN1 (WIENER_HALFWIN + 1)
 #define WIENER_WIN (2 * WIENER_HALFWIN + 1)
 #define WIENER_WIN2 ((WIENER_WIN) * (WIENER_WIN))
 #define WIENER_TMPBUF_SIZE (0)
 #define WIENER_EXTBUF_SIZE (0)

 // If WIENER_WIN_CHROMA == WIENER_WIN - 2, that implies 5x5 filters are used for
 // chroma. To use 7x7 for chroma set WIENER_WIN_CHROMA to WIENER_WIN.
 #define WIENER_WIN_CHROMA (WIENER_WIN - 2)
 #define WIENER_WIN2_CHROMA ((WIENER_WIN_CHROMA) * (WIENER_WIN_CHROMA))

 #define WIENER_FILT_PREC_BITS 7
 #define WIENER_FILT_STEP (1 << WIENER_FILT_PREC_BITS)

 // Central values for the taps
 #define WIENER_FILT_TAP0_MIDV (3)
 #define WIENER_FILT_TAP1_MIDV (-7)
 #define WIENER_FILT_TAP2_MIDV (15)
 #define WIENER_FILT_TAP3_MIDV                                              \
   (WIENER_FILT_STEP - 2 * (WIENER_FILT_TAP0_MIDV + WIENER_FILT_TAP1_MIDV + \
                            WIENER_FILT_TAP2_MIDV))

 #define WIENER_FILT_TAP0_BITS 4
 #define WIENER_FILT_TAP1_BITS 5
 #define WIENER_FILT_TAP2_BITS 6

 #define WIENER_FILT_BITS \
   ((WIENER_FILT_TAP0_BITS + WIENER_FILT_TAP1_BITS + WIENER_FILT_TAP2_BITS) * 2)

 #define WIENER_FILT_TAP0_MINV \
   (WIENER_FILT_TAP0_MIDV - (1 << WIENER_FILT_TAP0_BITS) / 2)
 #define WIENER_FILT_TAP1_MINV \
   (WIENER_FILT_TAP1_MIDV - (1 << WIENER_FILT_TAP1_BITS) / 2)
 #define WIENER_FILT_TAP2_MINV \
   (WIENER_FILT_TAP2_MIDV - (1 << WIENER_FILT_TAP2_BITS) / 2)

 #define WIENER_FILT_TAP0_MAXV \
   (WIENER_FILT_TAP0_MIDV - 1 + (1 << WIENER_FILT_TAP0_BITS) / 2)
 #define WIENER_FILT_TAP1_MAXV \
   (WIENER_FILT_TAP1_MIDV - 1 + (1 << WIENER_FILT_TAP1_BITS) / 2)
 #define WIENER_FILT_TAP2_MAXV \
   (WIENER_FILT_TAP2_MIDV - 1 + (1 << WIENER_FILT_TAP2_BITS) / 2)

 #define WIENER_FILT_TAP0_SUBEXP_K 1
 #define WIENER_FILT_TAP1_SUBEXP_K 2
 #define WIENER_FILT_TAP2_SUBEXP_K 3

 // Max of SGRPROJ_TMPBUF_SIZE, DOMAINTXFMRF_TMPBUF_SIZE, WIENER_TMPBUF_SIZE
 #define RESTORATION_TMPBUF_SIZE (SGRPROJ_TMPBUF_SIZE)

 // Max of SGRPROJ_EXTBUF_SIZE, WIENER_EXTBUF_SIZE
 #define RESTORATION_EXTBUF_SIZE (WIENER_EXTBUF_SIZE)

 // Check the assumptions of the existing code
 #if SUBPEL_TAPS != WIENER_WIN + 1
 #error "Wiener filter currently only works if SUBPEL_TAPS == WIENER_WIN + 1"
 #endif
 #if WIENER_FILT_PREC_BITS != 7
 #error "Wiener filter currently only works if WIENER_FILT_PREC_BITS == 7"
 #endif

 #define LR_TILE_ROW 0
 #define LR_TILE_COL 0
 #define LR_TILE_COLS 1

 typedef struct {
   int r[2];  // radii
   int s[2];  // sgr parameters for r[0] and r[1], based on GenSgrprojVtable()
 } sgr_params_type;

 typedef struct {
   RestorationType restoration_type;
   WienerInfo wiener_info;
   SgrprojInfo sgrproj_info;
 } RestorationUnitInfo;

 // A restoration line buffer needs space for two lines plus a horizontal filter
 // margin of RESTORATION_EXTRA_HORZ on each side.
 #define RESTORATION_LINEBUFFER_WIDTH \
   (RESTORATION_UNITSIZE_MAX * 3 / 2 + 2 * RESTORATION_EXTRA_HORZ)

 // Similarly, the column buffers (used when we're at a vertical tile edge
 // that we can't filter across) need space for one processing unit's worth
 // of pixels, plus the top/bottom border width
 #define RESTORATION_COLBUFFER_HEIGHT \
   (RESTORATION_PROC_UNIT_SIZE + 2 * RESTORATION_BORDER)

 typedef struct {
   // Temporary buffers to save/restore 3 lines above/below the restoration
   // stripe.
   uint16_t tmp_save_above[RESTORATION_BORDER][RESTORATION_LINEBUFFER_WIDTH];
   uint16_t tmp_save_below[RESTORATION_BORDER][RESTORATION_LINEBUFFER_WIDTH];
 } RestorationLineBuffers;

 typedef struct {
   uint8_t *stripe_boundary_above;
   uint8_t *stripe_boundary_below;
   int stripe_boundary_stride;
   int stripe_boundary_size;
 } RestorationStripeBoundaries;

 typedef struct {
   RestorationType frame_restoration_type;
   int restoration_unit_size;

   // Fields below here are allocated and initialised by
   // av1_alloc_restoration_struct. (horz_)units_per_tile give the number of
   // restoration units in (one row of) the largest tile in the frame. The data
   // in unit_info is laid out with units_per_tile entries for each tile, which
   // have stride horz_units_per_tile.
   //
   // Even if there are tiles of different sizes, the data in unit_info is laid
   // out as if all tiles are of full size.
   int units_per_tile;
   int vert_units_per_tile, horz_units_per_tile;
   RestorationUnitInfo *unit_info;
   RestorationStripeBoundaries boundaries;
   int optimized_lr;
 } RestorationInfo;

 static INLINE void set_default_sgrproj(SgrprojInfo *sgrproj_info) {
   sgrproj_info->xqd[0] = (SGRPROJ_PRJ_MIN0 + SGRPROJ_PRJ_MAX0) / 2;
   sgrproj_info->xqd[1] = (SGRPROJ_PRJ_MIN1 + SGRPROJ_PRJ_MAX1) / 2;
 }

 static INLINE void set_default_wiener(WienerInfo *wiener_info) {
   wiener_info->vfilter[0] = wiener_info->hfilter[0] = WIENER_FILT_TAP0_MIDV;
   wiener_info->vfilter[1] = wiener_info->hfilter[1] = WIENER_FILT_TAP1_MIDV;
   wiener_info->vfilter[2] = wiener_info->hfilter[2] = WIENER_FILT_TAP2_MIDV;
   wiener_info->vfilter[WIENER_HALFWIN] = wiener_info->hfilter[WIENER_HALFWIN] =
       -2 *
       (WIENER_FILT_TAP2_MIDV + WIENER_FILT_TAP1_MIDV + WIENER_FILT_TAP0_MIDV);
   wiener_info->vfilter[4] = wiener_info->hfilter[4] = WIENER_FILT_TAP2_MIDV;
   wiener_info->vfilter[5] = wiener_info->hfilter[5] = WIENER_FILT_TAP1_MIDV;
   wiener_info->vfilter[6] = wiener_info->hfilter[6] = WIENER_FILT_TAP0_MIDV;
 }

 typedef struct {
   int h_start, h_end, v_start, v_end;
 } RestorationTileLimits;

 typedef void (*rest_unit_visitor_t)(const RestorationTileLimits *limits,
                                     const AV1PixelRect *tile_rect,
                                     int rest_unit_idx, void *priv,
                                     int32_t *tmpbuf,
                                     RestorationLineBuffers *rlbs);

 typedef struct FilterFrameCtxt {
   const RestorationInfo *rsi;
   int tile_stripe0;
   int ss_x, ss_y;
   int highbd, bit_depth;
   uint8_t *data8, *dst8;
   int data_stride, dst_stride;
   AV1PixelRect tile_rect;
 } FilterFrameCtxt;

 typedef struct AV1LrStruct {
   rest_unit_visitor_t on_rest_unit;
   FilterFrameCtxt ctxt[MAX_MB_PLANE];
   YV12_BUFFER_CONFIG *frame;
   YV12_BUFFER_CONFIG *dst;
 } AV1LrStruct;

 extern const sgr_params_type sgr_params[SGRPROJ_PARAMS];
 extern int sgrproj_mtable[SGRPROJ_PARAMS][2];
 extern const int32_t x_by_xplus1[256];
 extern const int32_t one_by_x[MAX_NELEM];

 void av1_alloc_restoration_struct(struct AV1Common *cm, RestorationInfo *rsi,
                                   int is_uv);
 void av1_free_restoration_struct(RestorationInfo *rst_info);

 void extend_frame(uint8_t *data, int width, int height, int stride,
                   int border_horz, int border_vert, int highbd);
 void decode_xq(const int *xqd, int *xq, const sgr_params_type *params);

 // Filter a single loop restoration unit.
 //
 // limits is the limits of the unit. rui gives the mode to use for this unit
 // and its coefficients. If striped loop restoration is enabled, rsb contains
 // deblocked pixels to use for stripe boundaries; rlbs is just some space to
 // use as a scratch buffer. tile_rect gives the limits of the tile containing
 // this unit. tile_stripe0 is the index of the first stripe in this tile.
 //
 // ss_x and ss_y are flags which should be 1 if this is a plane with
 // horizontal/vertical subsampling, respectively. highbd is a flag which should
 // be 1 in high bit depth mode, in which case bit_depth is the bit depth.
 //
 // data8 is the frame data (pointing at the top-left corner of the frame, not
 // the restoration unit) and stride is its stride. dst8 is the buffer where the
 // results will be written and has stride dst_stride. Like data8, dst8 should
 // point at the top-left corner of the frame.
 //
 // Finally tmpbuf is a scratch buffer used by the sgrproj filter which should
 // be at least SGRPROJ_TMPBUF_SIZE big.
 void av1_loop_restoration_filter_unit(
     const RestorationTileLimits *limits, const RestorationUnitInfo *rui,
     const RestorationStripeBoundaries *rsb, RestorationLineBuffers *rlbs,
     const AV1PixelRect *tile_rect, int tile_stripe0, int ss_x, int ss_y,
     int highbd, int bit_depth, uint8_t *data8, int stride, uint8_t *dst8,
     int dst_stride, int32_t *tmpbuf, int optimized_lr);

 void av1_loop_restoration_filter_frame(YV12_BUFFER_CONFIG *frame,
                                        struct AV1Common *cm, int optimized_lr,
                                        void *lr_ctxt);
 void av1_loop_restoration_precal();

 typedef void (*rest_tile_start_visitor_t)(int tile_row, int tile_col,
                                           void *priv);
 struct AV1LrSyncData;

 typedef void (*sync_read_fn_t)(void *const lr_sync, int r, int c, int plane);

 typedef void (*sync_write_fn_t)(void *const lr_sync, int r, int c,
                                 const int sb_cols, int plane);

 // Call on_rest_unit for each loop restoration unit in the plane.
 void av1_foreach_rest_unit_in_plane(const struct AV1Common *cm, int plane,
                                     rest_unit_visitor_t on_rest_unit,
                                     void *priv, AV1PixelRect *tile_rect,
                                     int32_t *tmpbuf,
                                     RestorationLineBuffers *rlbs);

 // Return 1 iff the block at mi_row, mi_col with size bsize is a
 // top-level superblock containing the top-left corner of at least one
 // loop restoration unit.
 //
 // If the block is a top-level superblock, the function writes to
 // *rcol0, *rcol1, *rrow0, *rrow1. The rectangle of restoration unit
 // indices given by [*rcol0, *rcol1) x [*rrow0, *rrow1) are relative
 // to the current tile, whose starting index is returned as
 // *tile_tl_idx.
 int av1_loop_restoration_corners_in_sb(const struct AV1Common *cm, int plane,
                                        int mi_row, int mi_col, BLOCK_SIZE bsize,
                                        int *rcol0, int *rcol1, int *rrow0,
                                        int *rrow1);

 void av1_loop_restoration_save_boundary_lines(const YV12_BUFFER_CONFIG *frame,
                                               struct AV1Common *cm,
                                               int after_cdef);
 void av1_loop_restoration_filter_frame_init(AV1LrStruct *lr_ctxt,
                                             YV12_BUFFER_CONFIG *frame,
                                             struct AV1Common *cm,
                                             int optimized_lr, int num_planes);
 void av1_loop_restoration_copy_planes(AV1LrStruct *loop_rest_ctxt,
                                       struct AV1Common *cm, int num_planes);
 void av1_foreach_rest_unit_in_row(
     RestorationTileLimits *limits, const AV1PixelRect *tile_rect,
     rest_unit_visitor_t on_rest_unit, int row_number, int unit_size,
     int unit_idx0, int hunits_per_tile, int vunits_per_tile, int plane,
     void *priv, int32_t *tmpbuf, RestorationLineBuffers *rlbs,
     sync_read_fn_t on_sync_read, sync_write_fn_t on_sync_write,
     struct AV1LrSyncData *const lr_sync);
 AV1PixelRect av1_whole_frame_rect(const struct AV1Common *cm, int is_uv);
 int av1_lr_count_units_in_tile(int unit_size, int tile_size);
 void av1_lr_sync_read_dummy(void *const lr_sync, int r, int c, int plane);
 void av1_lr_sync_write_dummy(void *const lr_sync, int r, int c,
                              const int sb_cols, int plane);
 #ifdef __cplusplus
 }  // extern "C"
 #endif

 #endif  // AV1_COMMON_RESTORATION_H_
	/*
	* 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.
	*/

	#ifndef AV1_COMMON_RESTORATION_H_
	#define AV1_COMMON_RESTORATION_H_

	#include "aom_ports/mem.h"
	#include "config/aom_config.h"

	#include "av1/common/blockd.h"
	#include "av1/common/enums.h"

	#ifdef __cplusplus
	extern "C" {
	#endif

	#define CLIP(x, lo, hi) ((x) < (lo) ? (lo) : (x) > (hi) ? (hi) : (x))
	#define RINT(x) ((x) < 0 ? (int)((x)-0.5) : (int)((x) + 0.5))

	#define RESTORATION_PROC_UNIT_SIZE 64

	// Filter tile grid offset upwards compared to the superblock grid
	#define RESTORATION_UNIT_OFFSET 8

	#define SGRPROJ_BORDER_VERT 3 // Vertical border used for Sgr
	#define SGRPROJ_BORDER_HORZ 3 // Horizontal border used for Sgr

	#define WIENER_BORDER_VERT 2 // Vertical border used for Wiener
	#define WIENER_HALFWIN 3
	#define WIENER_BORDER_HORZ (WIENER_HALFWIN) // Horizontal border for Wiener

	// RESTORATION_BORDER_VERT determines line buffer requirement for LR.
	// Should be set at the max of SGRPROJ_BORDER_VERT and WIENER_BORDER_VERT.
	// Note the line buffer needed is twice the value of this macro.
	#if SGRPROJ_BORDER_VERT >= WIENER_BORDER_VERT
	#define RESTORATION_BORDER_VERT (SGRPROJ_BORDER_VERT)
	#else
	#define RESTORATION_BORDER_VERT (WIENER_BORDER_VERT)
	#endif // SGRPROJ_BORDER_VERT >= WIENER_BORDER_VERT

	#if SGRPROJ_BORDER_HORZ >= WIENER_BORDER_HORZ
	#define RESTORATION_BORDER_HORZ (SGRPROJ_BORDER_HORZ)
	#else
	#define RESTORATION_BORDER_HORZ (WIENER_BORDER_HORZ)
	#endif // SGRPROJ_BORDER_VERT >= WIENER_BORDER_VERT

	// How many border pixels do we need for each processing unit?
	#define RESTORATION_BORDER 3

	// How many rows of deblocked pixels do we save above/below each processing
	// stripe?
	#define RESTORATION_CTX_VERT 2

	// Additional pixels to the left and right in above/below buffers
	// It is RESTORATION_BORDER_HORZ rounded up to get nicer buffer alignment
	#define RESTORATION_EXTRA_HORZ 4

	// Pad up to 20 more (may be much less is needed)
	#define RESTORATION_PADDING 20
	#define RESTORATION_PROC_UNIT_PELS \
	((RESTORATION_PROC_UNIT_SIZE + RESTORATION_BORDER_HORZ * 2 + \
	RESTORATION_PADDING) * \
	(RESTORATION_PROC_UNIT_SIZE + RESTORATION_BORDER_VERT * 2 + \
	RESTORATION_PADDING))

	#define RESTORATION_UNITSIZE_MAX 256
	#define RESTORATION_UNITPELS_HORZ_MAX \
	(RESTORATION_UNITSIZE_MAX * 3 / 2 + 2 * RESTORATION_BORDER_HORZ + 16)
	#define RESTORATION_UNITPELS_VERT_MAX \
	((RESTORATION_UNITSIZE_MAX * 3 / 2 + 2 * RESTORATION_BORDER_VERT + \
	RESTORATION_UNIT_OFFSET))
	#define RESTORATION_UNITPELS_MAX \
	(RESTORATION_UNITPELS_HORZ_MAX * RESTORATION_UNITPELS_VERT_MAX)

	// Two 32-bit buffers needed for the restored versions from two filters
	// TODO(debargha, rupert): Refactor to not need the large tilesize to be stored
	// on the decoder side.
	#define SGRPROJ_TMPBUF_SIZE (RESTORATION_UNITPELS_MAX * 2 * sizeof(int32_t))

	#define SGRPROJ_EXTBUF_SIZE (0)
	#define SGRPROJ_PARAMS_BITS 4
	#define SGRPROJ_PARAMS (1 << SGRPROJ_PARAMS_BITS)

	// Precision bits for projection
	#define SGRPROJ_PRJ_BITS 7
	// Restoration precision bits generated higher than source before projection
	#define SGRPROJ_RST_BITS 4
	// Internal precision bits for core selfguided_restoration
	#define SGRPROJ_SGR_BITS 8
	#define SGRPROJ_SGR (1 << SGRPROJ_SGR_BITS)

	#define SGRPROJ_PRJ_MIN0 (-(1 << SGRPROJ_PRJ_BITS) * 3 / 4)
	#define SGRPROJ_PRJ_MAX0 (SGRPROJ_PRJ_MIN0 + (1 << SGRPROJ_PRJ_BITS) - 1)
	#define SGRPROJ_PRJ_MIN1 (-(1 << SGRPROJ_PRJ_BITS) / 4)
	#define SGRPROJ_PRJ_MAX1 (SGRPROJ_PRJ_MIN1 + (1 << SGRPROJ_PRJ_BITS) - 1)

	#define SGRPROJ_PRJ_SUBEXP_K 4

	#define SGRPROJ_BITS (SGRPROJ_PRJ_BITS * 2 + SGRPROJ_PARAMS_BITS)

	#define MAX_RADIUS 2 // Only 1, 2, 3 allowed
	#define MAX_NELEM ((2 * MAX_RADIUS + 1) * (2 * MAX_RADIUS + 1))
	#define SGRPROJ_MTABLE_BITS 20
	#define SGRPROJ_RECIP_BITS 12

	#define WIENER_HALFWIN1 (WIENER_HALFWIN + 1)
	#define WIENER_WIN (2 * WIENER_HALFWIN + 1)
	#define WIENER_WIN2 ((WIENER_WIN) * (WIENER_WIN))
	#define WIENER_TMPBUF_SIZE (0)
	#define WIENER_EXTBUF_SIZE (0)

	// If WIENER_WIN_CHROMA == WIENER_WIN - 2, that implies 5x5 filters are used for
	// chroma. To use 7x7 for chroma set WIENER_WIN_CHROMA to WIENER_WIN.
	#define WIENER_WIN_CHROMA (WIENER_WIN - 2)
	#define WIENER_WIN2_CHROMA ((WIENER_WIN_CHROMA) * (WIENER_WIN_CHROMA))

	#define WIENER_FILT_PREC_BITS 7
	#define WIENER_FILT_STEP (1 << WIENER_FILT_PREC_BITS)

	// Central values for the taps
	#define WIENER_FILT_TAP0_MIDV (3)
	#define WIENER_FILT_TAP1_MIDV (-7)
	#define WIENER_FILT_TAP2_MIDV (15)
	#define WIENER_FILT_TAP3_MIDV \
	(WIENER_FILT_STEP - 2 * (WIENER_FILT_TAP0_MIDV + WIENER_FILT_TAP1_MIDV + \
	WIENER_FILT_TAP2_MIDV))

	#define WIENER_FILT_TAP0_BITS 4
	#define WIENER_FILT_TAP1_BITS 5
	#define WIENER_FILT_TAP2_BITS 6

	#define WIENER_FILT_BITS \
	((WIENER_FILT_TAP0_BITS + WIENER_FILT_TAP1_BITS + WIENER_FILT_TAP2_BITS) * 2)

	#define WIENER_FILT_TAP0_MINV \
	(WIENER_FILT_TAP0_MIDV - (1 << WIENER_FILT_TAP0_BITS) / 2)
	#define WIENER_FILT_TAP1_MINV \
	(WIENER_FILT_TAP1_MIDV - (1 << WIENER_FILT_TAP1_BITS) / 2)
	#define WIENER_FILT_TAP2_MINV \
	(WIENER_FILT_TAP2_MIDV - (1 << WIENER_FILT_TAP2_BITS) / 2)

	#define WIENER_FILT_TAP0_MAXV \
	(WIENER_FILT_TAP0_MIDV - 1 + (1 << WIENER_FILT_TAP0_BITS) / 2)
	#define WIENER_FILT_TAP1_MAXV \
	(WIENER_FILT_TAP1_MIDV - 1 + (1 << WIENER_FILT_TAP1_BITS) / 2)
	#define WIENER_FILT_TAP2_MAXV \
	(WIENER_FILT_TAP2_MIDV - 1 + (1 << WIENER_FILT_TAP2_BITS) / 2)

	#define WIENER_FILT_TAP0_SUBEXP_K 1
	#define WIENER_FILT_TAP1_SUBEXP_K 2
	#define WIENER_FILT_TAP2_SUBEXP_K 3

	// Max of SGRPROJ_TMPBUF_SIZE, DOMAINTXFMRF_TMPBUF_SIZE, WIENER_TMPBUF_SIZE
	#define RESTORATION_TMPBUF_SIZE (SGRPROJ_TMPBUF_SIZE)

	// Max of SGRPROJ_EXTBUF_SIZE, WIENER_EXTBUF_SIZE
	#define RESTORATION_EXTBUF_SIZE (WIENER_EXTBUF_SIZE)

	// Check the assumptions of the existing code
	#if SUBPEL_TAPS != WIENER_WIN + 1
	#error "Wiener filter currently only works if SUBPEL_TAPS == WIENER_WIN + 1"
	#endif
	#if WIENER_FILT_PREC_BITS != 7
	#error "Wiener filter currently only works if WIENER_FILT_PREC_BITS == 7"
	#endif

	#define LR_TILE_ROW 0
	#define LR_TILE_COL 0
	#define LR_TILE_COLS 1

	typedef struct {
	int r[2]; // radii
	int s[2]; // sgr parameters for r[0] and r[1], based on GenSgrprojVtable()
	} sgr_params_type;

	typedef struct {
	RestorationType restoration_type;
	WienerInfo wiener_info;
	SgrprojInfo sgrproj_info;
	} RestorationUnitInfo;

	// A restoration line buffer needs space for two lines plus a horizontal filter
	// margin of RESTORATION_EXTRA_HORZ on each side.
	#define RESTORATION_LINEBUFFER_WIDTH \
	(RESTORATION_UNITSIZE_MAX * 3 / 2 + 2 * RESTORATION_EXTRA_HORZ)

	// Similarly, the column buffers (used when we're at a vertical tile edge
	// that we can't filter across) need space for one processing unit's worth
	// of pixels, plus the top/bottom border width
	#define RESTORATION_COLBUFFER_HEIGHT \
	(RESTORATION_PROC_UNIT_SIZE + 2 * RESTORATION_BORDER)

	typedef struct {
	// Temporary buffers to save/restore 3 lines above/below the restoration
	// stripe.
	uint16_t tmp_save_above[RESTORATION_BORDER][RESTORATION_LINEBUFFER_WIDTH];
	uint16_t tmp_save_below[RESTORATION_BORDER][RESTORATION_LINEBUFFER_WIDTH];
	} RestorationLineBuffers;

	typedef struct {
	uint8_t *stripe_boundary_above;
	uint8_t *stripe_boundary_below;
	int stripe_boundary_stride;
	int stripe_boundary_size;
	} RestorationStripeBoundaries;

	typedef struct {
	RestorationType frame_restoration_type;
	int restoration_unit_size;

	// Fields below here are allocated and initialised by
	// av1_alloc_restoration_struct. (horz_)units_per_tile give the number of
	// restoration units in (one row of) the largest tile in the frame. The data
	// in unit_info is laid out with units_per_tile entries for each tile, which
	// have stride horz_units_per_tile.
	//
	// Even if there are tiles of different sizes, the data in unit_info is laid
	// out as if all tiles are of full size.
	int units_per_tile;
	int vert_units_per_tile, horz_units_per_tile;
	RestorationUnitInfo *unit_info;
	RestorationStripeBoundaries boundaries;
	int optimized_lr;
	} RestorationInfo;

	static INLINE void set_default_sgrproj(SgrprojInfo *sgrproj_info) {
	sgrproj_info->xqd[0] = (SGRPROJ_PRJ_MIN0 + SGRPROJ_PRJ_MAX0) / 2;
	sgrproj_info->xqd[1] = (SGRPROJ_PRJ_MIN1 + SGRPROJ_PRJ_MAX1) / 2;
	}

	static INLINE void set_default_wiener(WienerInfo *wiener_info) {
	wiener_info->vfilter[0] = wiener_info->hfilter[0] = WIENER_FILT_TAP0_MIDV;
	wiener_info->vfilter[1] = wiener_info->hfilter[1] = WIENER_FILT_TAP1_MIDV;
	wiener_info->vfilter[2] = wiener_info->hfilter[2] = WIENER_FILT_TAP2_MIDV;
	wiener_info->vfilter[WIENER_HALFWIN] = wiener_info->hfilter[WIENER_HALFWIN] =
	-2 *
	(WIENER_FILT_TAP2_MIDV + WIENER_FILT_TAP1_MIDV + WIENER_FILT_TAP0_MIDV);
	wiener_info->vfilter[4] = wiener_info->hfilter[4] = WIENER_FILT_TAP2_MIDV;
	wiener_info->vfilter[5] = wiener_info->hfilter[5] = WIENER_FILT_TAP1_MIDV;
	wiener_info->vfilter[6] = wiener_info->hfilter[6] = WIENER_FILT_TAP0_MIDV;
	}

	typedef struct {
	int h_start, h_end, v_start, v_end;
	} RestorationTileLimits;

	typedef void (rest_unit_visitor_t)(const RestorationTileLimits limits,
	const AV1PixelRect *tile_rect,
	int rest_unit_idx, void *priv,
	int32_t *tmpbuf,
	RestorationLineBuffers *rlbs);

	typedef struct FilterFrameCtxt {
	const RestorationInfo *rsi;
	int tile_stripe0;
	int ss_x, ss_y;
	int highbd, bit_depth;
	uint8_t data8, dst8;
	int data_stride, dst_stride;
	AV1PixelRect tile_rect;
	} FilterFrameCtxt;

	typedef struct AV1LrStruct {
	rest_unit_visitor_t on_rest_unit;
	FilterFrameCtxt ctxt[MAX_MB_PLANE];
	YV12_BUFFER_CONFIG *frame;
	YV12_BUFFER_CONFIG *dst;
	} AV1LrStruct;

	extern const sgr_params_type sgr_params[SGRPROJ_PARAMS];
	extern int sgrproj_mtable[SGRPROJ_PARAMS][2];
	extern const int32_t x_by_xplus1[256];
	extern const int32_t one_by_x[MAX_NELEM];

	void av1_alloc_restoration_struct(struct AV1Common cm, RestorationInfo rsi,
	int is_uv);
	void av1_free_restoration_struct(RestorationInfo *rst_info);

	void extend_frame(uint8_t *data, int width, int height, int stride,
	int border_horz, int border_vert, int highbd);
	void decode_xq(const int xqd, int xq, const sgr_params_type *params);

	// Filter a single loop restoration unit.
	//
	// limits is the limits of the unit. rui gives the mode to use for this unit
	// and its coefficients. If striped loop restoration is enabled, rsb contains
	// deblocked pixels to use for stripe boundaries; rlbs is just some space to
	// use as a scratch buffer. tile_rect gives the limits of the tile containing
	// this unit. tile_stripe0 is the index of the first stripe in this tile.
	//
	// ss_x and ss_y are flags which should be 1 if this is a plane with
	// horizontal/vertical subsampling, respectively. highbd is a flag which should
	// be 1 in high bit depth mode, in which case bit_depth is the bit depth.
	//
	// data8 is the frame data (pointing at the top-left corner of the frame, not
	// the restoration unit) and stride is its stride. dst8 is the buffer where the
	// results will be written and has stride dst_stride. Like data8, dst8 should
	// point at the top-left corner of the frame.
	//
	// Finally tmpbuf is a scratch buffer used by the sgrproj filter which should
	// be at least SGRPROJ_TMPBUF_SIZE big.
	void av1_loop_restoration_filter_unit(
	const RestorationTileLimits limits, const RestorationUnitInfo rui,
	const RestorationStripeBoundaries rsb, RestorationLineBuffers rlbs,
	const AV1PixelRect *tile_rect, int tile_stripe0, int ss_x, int ss_y,
	int highbd, int bit_depth, uint8_t data8, int stride, uint8_t dst8,
	int dst_stride, int32_t *tmpbuf, int optimized_lr);

	void av1_loop_restoration_filter_frame(YV12_BUFFER_CONFIG *frame,
	struct AV1Common *cm, int optimized_lr,
	void *lr_ctxt);
	void av1_loop_restoration_precal();

	typedef void (*rest_tile_start_visitor_t)(int tile_row, int tile_col,
	void *priv);
	struct AV1LrSyncData;

	typedef void (sync_read_fn_t)(void const lr_sync, int r, int c, int plane);

	typedef void (sync_write_fn_t)(void const lr_sync, int r, int c,
	const int sb_cols, int plane);

	// Call on_rest_unit for each loop restoration unit in the plane.
	void av1_foreach_rest_unit_in_plane(const struct AV1Common *cm, int plane,
	rest_unit_visitor_t on_rest_unit,
	void priv, AV1PixelRect tile_rect,
	int32_t *tmpbuf,
	RestorationLineBuffers *rlbs);

	// Return 1 iff the block at mi_row, mi_col with size bsize is a
	// top-level superblock containing the top-left corner of at least one
	// loop restoration unit.
	//
	// If the block is a top-level superblock, the function writes to
	// rcol0, rcol1, rrow0, rrow1. The rectangle of restoration unit
	// indices given by [rcol0, rcol1) x [rrow0, rrow1) are relative
	// to the current tile, whose starting index is returned as
	// *tile_tl_idx.
	int av1_loop_restoration_corners_in_sb(const struct AV1Common *cm, int plane,
	int mi_row, int mi_col, BLOCK_SIZE bsize,
	int rcol0, int rcol1, int *rrow0,
	int *rrow1);

	void av1_loop_restoration_save_boundary_lines(const YV12_BUFFER_CONFIG *frame,
	struct AV1Common *cm,
	int after_cdef);
	void av1_loop_restoration_filter_frame_init(AV1LrStruct *lr_ctxt,
	YV12_BUFFER_CONFIG *frame,
	struct AV1Common *cm,
	int optimized_lr, int num_planes);
	void av1_loop_restoration_copy_planes(AV1LrStruct *loop_rest_ctxt,
	struct AV1Common *cm, int num_planes);
	void av1_foreach_rest_unit_in_row(
	RestorationTileLimits limits, const AV1PixelRect tile_rect,
	rest_unit_visitor_t on_rest_unit, int row_number, int unit_size,
	int unit_idx0, int hunits_per_tile, int vunits_per_tile, int plane,
	void priv, int32_t tmpbuf, RestorationLineBuffers *rlbs,
	sync_read_fn_t on_sync_read, sync_write_fn_t on_sync_write,
	struct AV1LrSyncData *const lr_sync);
	AV1PixelRect av1_whole_frame_rect(const struct AV1Common *cm, int is_uv);
	int av1_lr_count_units_in_tile(int unit_size, int tile_size);
	void av1_lr_sync_read_dummy(void *const lr_sync, int r, int c, int plane);
	void av1_lr_sync_write_dummy(void *const lr_sync, int r, int c,
	const int sb_cols, int plane);
	#ifdef __cplusplus
	} // extern "C"
	#endif

	#endif // AV1_COMMON_RESTORATION_H_