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/*
* Copyright (c) 2021, 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_SPARSE_LINEAR_SOLVER_H_
#define AV1_COMMON_SPARSE_LINEAR_SOLVER_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "config/aom_config.h"
#if CONFIG_OPTICAL_FLOW_API
// Number of iterations for solving linear equations.
#define MAX_CG_SP_ITER 100
typedef struct {
int n_elem; // number of non-zero elements
int n_rows;
int n_cols;
// using arrays to represent non-zero elements.
int *col_pos;
int *row_pos; // starts with 0
double *value;
} SPARSE_MTX;
void av1_init_sparse_mtx(const int *rows, const int *cols, const double *values,
int num_elem, int num_rows, int num_cols,
SPARSE_MTX *sm);
void av1_init_combine_sparse_mtx(const SPARSE_MTX *sm1, const SPARSE_MTX *sm2,
SPARSE_MTX *sm, int row_offset1,
int col_offset1, int row_offset2,
int col_offset2, int new_n_rows,
int new_n_cols);
void av1_free_sparse_mtx_elems(SPARSE_MTX *sm);
void av1_mtx_vect_multi_right(const SPARSE_MTX *sm, const double *srcv,
double *dstv, int dstl);
void av1_mtx_vect_multi_left(const SPARSE_MTX *sm, const double *srcv,
double *dstv, int dstl);
double av1_vect_vect_multi(const double *src1, int src1l, const double *src2);
void av1_constant_multiply_sparse_matrix(SPARSE_MTX *sm, double c);
void av1_conjugate_gradient_sparse(const SPARSE_MTX *A, const double *b, int bl,
double *x);
void av1_bi_conjugate_gradient_sparse(const SPARSE_MTX *A, const double *b,
int bl, double *x);
void av1_jacobi_sparse(const SPARSE_MTX *A, const double *b, int bl, double *x);
void av1_steepest_descent_sparse(const SPARSE_MTX *A, const double *b, int bl,
double *x);
#endif // CONFIG_OPTICAL_FLOW_API
#ifdef __cplusplus
} // extern "C"
#endif
#endif /* AV1_COMMON_SPARSE_LINEAR_SOLVER_H_ */
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