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

#include "decoder.hpp"

#include "decoderMP3.hpp"
#include "decoderFLAC.hpp"
#include "decoderWAV.hpp"

namespace decoder {


    decoder::decoder(const char *fileName)
            : filePath(fileName),
              workerBuffer(std::make_unique<int16_t[]>(workerBufferSize)) {

        fd = vfs.fopen(fileName, "r");
        if (fd == NULL) {
            return;
        }

        vfs.fseek(fd,0,SEEK_END);
        fileSize = vfs.ftell(fd);
        vfs.rewind(fd);

    }

     decoder::~decoder() {
        if(fd){
            vfs.fclose(fd);
        }
    }

    std::unique_ptr<decoder> decoder::Create(const char *file) {
        std::unique_ptr<decoder> dec;
        if ((strstr(file, ".wav") != NULL) || (strstr(file, ".WAV") != NULL)) {
            dec =  std::make_unique<decoderWAV>(file);
        } else if ((strstr(file, ".mp3") != NULL) || (strstr(file, ".MP3") != NULL)) {
            dec = std::make_unique<decoderMP3>(file);
        } else if ((strstr(file, ".flac") != NULL) || (strstr(file, ".FLAC") != NULL)) {
            dec =  std::make_unique<decoderFLAC>(file);
        }

        if(dec->fileSize == 0){
            //error 
            return nullptr;
        }
        else{
            return dec;
        }
    }


    void decoder::convertmono2stereo(int16_t *pcm, uint32_t samplecount) {
        uint32_t i = 0, j = 0;

        memset(workerBuffer.get(), 0, workerBufferSize*sizeof(int16_t));

        for (; j < samplecount; j++) {
            workerBuffer[i++] = pcm[j];
            workerBuffer[i++] = pcm[j];
        }

        memcpy(pcm, &workerBuffer[0], samplecount * 2 * sizeof(int16_t));
    }
}