/*
 *  @file decoderMP3.h
 *  @author Mateusz Piesta (mateusz.piesta@mudita.com)
 *  @date 04.04.19
 *  @brief 
 *  @copyright Copyright (C) 2019 mudita.com
 *  @details
 */

#ifndef UNTITLED1_DECODERMP3_HPP
#define UNTITLED1_DECODERMP3_HPP


#include "minimp3.h"

#include <cstring>
#include "decoder.hpp"


extern "C" {
#include "xing_header.h"
};

namespace audio {

    class decoderMP3 : public decoder {

    public:

        decoderMP3(const char *fileName);

        ~decoderMP3();

        std::unique_ptr<Tags> fetchTags() override;

        uint32_t decode(uint32_t samplesToRead, int16_t *pcmData) override;

        void setPosition(float pos) override;


    private:

        bool find_first_valid_frame();

        uint32_t get_frames_count();


        std::unique_ptr<Tags> tag;

        const uint32_t DECODER_BUFFER_SIZE = 1024 * 24;


        mp3dec_t *mp3d = nullptr;

        std::unique_ptr<uint8_t[]> decoderBuffer = nullptr;
        uint32_t decoderBufferIdx = 0;

        std::unique_ptr<uint16_t[]> pcmsamplesbuffer = nullptr;
        uint32_t pcmsamplesbuffer_idx = 0;

        const size_t pcmsamplesbuffer_size = (8192 + MINIMP3_MAX_SAMPLES_PER_FRAME) * sizeof(int16_t);

        uint32_t samplesPerFrame = 0;

        // Variables below are used during decoding procedure
        uint32_t firstValidFrameByteSize = 0;
        uint32_t firstValidFrameFileOffset = 0;
        bool lastRefill = false;
        bool decoderNotFirstRun = false;
        uint32_t bytesAvailable = 0;
    };

}

#endif //UNTITLED1_DECODERMP3_HPP