85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
/* impulse_cache.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2019, 2024 Warren Pratt, NR0V
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Copyright (C) 2025 Richard Samphire, MW0LGE
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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mw0lge@grange-lane.co.uk
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*/
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//
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//============================================================================================//
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// Dual-Licensing Statement (Applies Only to Author's Contributions, Richard Samphire MW0LGE) //
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// ------------------------------------------------------------------------------------------ //
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// For any code originally written by Richard Samphire MW0LGE, or for any modifications //
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// made by him, the copyright holder for those portions (Richard Samphire) reserves the //
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// right to use, license, and distribute such code under different terms, including //
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// closed-source and proprietary licences, in addition to the GNU General Public License //
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// granted above. Nothing in this statement restricts any rights granted to recipients under //
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// the GNU GPL. Code contributed by others (not Richard Samphire) remains licensed under //
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// its original terms and is not affected by this dual-licensing statement in any way. //
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// Richard Samphire can be reached by email at : mw0lge@grange-lane.co.uk //
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//============================================================================================//
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#ifndef _impulse_cache_h
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#define _impulse_cache_h
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#include <stdint.h>
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#include <stddef.h>
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#if defined(_WIN64)
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// 64-bit build
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extern uint64_t fnv1a_hash64(const void* data, size_t len);
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#define GOLDEN_RATIO_64 0x9E3779B97F4A7C15ULL
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#define HASH_T uint64_t
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#define fnv1a_hash fnv1a_hash64
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#define GOLDEN_RATIO GOLDEN_RATIO_64
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#else
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// 32-bit build
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extern uint32_t fnv1a_hash32(const void* data, size_t len);
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#define GOLDEN_RATIO_32 0x9e3779b9U
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#define HASH_T uint32_t
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#define fnv1a_hash fnv1a_hash32
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#define GOLDEN_RATIO GOLDEN_RATIO_32
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#endif
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#define MAX_CACHE_ENTRIES 4096 // max number of cache entires per cache bucket
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#define CACHE_BUCKETS 4 // 4 cache buckets, for fir_bandpass, mp, eq, fc. Unique indexes in the #defines below
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#define FIR_CACHE 0
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#define MP_CACHE 1
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#define EQ_CACHE 2
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#define FC_CACHE 3
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double* get_impulse_cache_entry(size_t bucket, HASH_T hash, int N);
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void add_impulse_to_cache(size_t bucket, HASH_T hash, int N, double* impulse);
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__declspec (dllexport) int save_impulse_cache(const char* path);
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__declspec (dllexport) int read_impulse_cache(const char* path);
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__declspec (dllexport) void use_impulse_cache(int use);
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__declspec (dllexport) void init_impulse_cache(int use);
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__declspec (dllexport) void destroy_impulse_cache(void);
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#endif
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