musix 0.3.5

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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#include <string>

#include <fmt/format.h>

#include <audioplayer/audioplayer.h>
#include <coreutils/fifo.h>
#include <coreutils/log.h>
#include <coreutils/utils.h>

//#include "plugins/plugins.h"
#include "chipplayer.h"
#include "chipplugin.h"
#include "songfile_identifier.h"
#include "songinfo.h"

using musix::ChipPlayer;
using musix::ChipPlugin;

#ifdef _WIN32
#    define API __declspec(dllexport)
#else
#    define API
#endif

static std::string error_message;

struct Result {
    char const* title;
    char const* game;
    char const* composer;
    char const* format;
    int32_t length;
};

extern "C" API Result const* musix_identify_file(const char* fileName, const char *ext)
{
    SongInfo info;
    info.path = fileName;
    if (ext == nullptr) { ext = ""; }
    if(!identify_song(info, ext)) {
        //printf("FAILED\n");
        return nullptr;
    }

    //printf("FILE: %s\n", info.path.c_str());
    //printf("GAME: %s\n", info.game.c_str());
    //printf("COMPOSER: %s\n", info.composer.c_str());

    int tl = info.title.length() + 1;
    int cl = info.composer.length() + 1;
    int gl = info.game.length() + 1;
    int fl = info.format.length() + 1;


    char* mem = (char*)malloc(tl + cl + gl + fl + sizeof(Result));

    Result* result = (Result*)mem;
    mem += sizeof(Result);

    result->title = mem;
    memcpy(mem, info.title.c_str(), tl);
    mem += tl;
    result->game = mem;
    memcpy(mem, info.game.c_str(), gl);
    mem += gl;
    result->composer = mem; 
    memcpy(mem, info.composer.c_str(), cl);
    mem += cl;
    result->format = mem;
    memcpy(mem, info.format.c_str(), fl);
    mem += fl;

    return result;
}

extern "C" API int musix_create(const char* dataDir)
{
    try {
        musix::ChipPlugin::createPlugins(dataDir);
    } catch (std::exception& e) {
        error_message = e.what();
        return -1;
    }
    return 0;
}

extern "C" API const char*  musix_get_error()
{
    return error_message.c_str();
}

extern "C" API void* musix_find_plugin(const char* fileName, const void* afterPlugin)
{

    for (const auto& plugin : ChipPlugin::getPlugins()) {
        if (afterPlugin == nullptr) {
            if (plugin->canHandle(fileName)) { return plugin.get(); }
        }
        if (afterPlugin == plugin.get()) {
            afterPlugin = nullptr;
        }
    }
    return nullptr;
}

extern "C" API void* musix_plugin_create_player(void* plugin,
                                                const char* fileName)
{
    error_message = "";
    try {
        auto* chipPlugin = static_cast<ChipPlugin*>(plugin);
        return chipPlugin->fromFile(fileName);
    } catch (std::exception& e) {
        error_message = e.what();
    }
    return nullptr;
}

extern "C" API void musix_player_destroy(void* player)
{
    delete static_cast<ChipPlayer*>(player);
}

extern "C" API int musix_player_get_samples(void* player, int16_t* target,
                                            int size)
{
    auto* chipPlayer = static_cast<ChipPlayer*>(player);
    return chipPlayer->getSamples(target, size);
}

extern "C" API int musix_player_get_hz(void *player)
{
    auto* chipPlayer = static_cast<ChipPlayer*>(player);
    return chipPlayer->getHZ();
}

extern "C" API const char* musix_player_get_meta(void* player, const char* what)
{
    auto* chipPlayer = static_cast<ChipPlayer*>(player);
    auto s = std::visit([](auto&& x) { return fmt::format("{}", x); },
                        chipPlayer->meta(what));
    return strdup(s.c_str());
}

extern "C" API const char* musix_player_get_meta_int(void* player, const char* what)
{
    auto* chipPlayer = static_cast<ChipPlayer*>(player);
    auto s = std::visit([](auto&& x) { return fmt::format("{}", x); },
                        chipPlayer->meta(what));
    return strdup(s.c_str());
}

extern "C" API const char* musix_get_changed_meta(void* player)
{
    auto* chipPlayer = static_cast<ChipPlayer*>(player);
    if (auto&& meta = chipPlayer->getChangedMeta())
    {
       return strdup(meta->c_str());
    }
    return nullptr;
}

extern "C" API const char* musix_plugin_get_secondary_file(void* plugin, const char* song_file)
{
    auto* chipPlugin = static_cast<ChipPlugin*>(plugin);
    auto secondary = chipPlugin->getSecondaryFiles(song_file);
    if (!secondary.empty()) {
       return strdup(secondary[0].c_str());
    }
    return nullptr;
}


extern "C" API void musix_player_seek(void* player, int song, int seconds)
{
    auto* chipPlayer = static_cast<ChipPlayer*>(player);
    chipPlayer->seekTo(song, seconds);
}