olaf_fp_extractor.h

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// Olaf: Overly Lightweight Acoustic Fingerprinting
// Copyright (C) 2019-2025  Joren Six
 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
 
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

 
#ifndef OLAF_FP_EXTRACTOR_H
#define OLAF_FP_EXTRACTOR_H
 
    #include "olaf_config.h"
    #include "olaf_ep_extractor.h"
    #include <stdint.h>
    
    struct fingerprint{
        int frequencyBin1; 
        int timeIndex1; 
        float magnitude1; 
 
        int frequencyBin2; 
        int timeIndex2; 
        float magnitude2; 
 
        int frequencyBin3; 
        int timeIndex3; 
        float magnitude3; 
    };

    struct extracted_fingerprints{
        struct fingerprint * fingerprints; 
        size_t fingerprintIndex; 
    };
    
    typedef struct Olaf_FP_Extractor Olaf_FP_Extractor;
 
    Olaf_FP_Extractor * olaf_fp_extractor_new(Olaf_Config * config);
 
    void olaf_fp_extractor_destroy(Olaf_FP_Extractor * olaf_fp_extractor);
 
    struct extracted_fingerprints * olaf_fp_extractor_extract(Olaf_FP_Extractor * olaf_fp_extractor,struct extracted_event_points * eps,int audioBlockIndex);
    
    size_t olaf_fp_extractor_total(Olaf_FP_Extractor * fp_extractor);
 
    //static methods:

    uint64_t olaf_fp_extractor_hash(struct fingerprint f);

    void olaf_fp_extractor_print(struct fingerprint f);
 
    //to sort hashes use this comparator
    
    //int olaf_fp_extractor_compare_fp(const void * a, const void * b);
 
#endif // OLAF_FP_EXTRACTOR_H