musix 0.3.3

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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#include "GSFPlugin.h"

#include <coreutils/utils.h>
#include <psf/PSFFile.h>

#include <cstdio>
#include <cstdlib>
#include <set>
#include <unordered_map>

extern "C"
{
#include "VBA/psftag.h"
#include "gsf.h"
}

#include <coreutils/fifo.h>

extern "C"
{
    int defvolume = 1000;
    int relvolume = 1000;
    int TrackLength = 0;
    int FadeLength = 0;
    int IgnoreTrackLength, DefaultLength = 150000;
    int playforever = 1;
    int fileoutput = 0;
    int TrailingSilence = 1000;
    int DetectSilence = 0, silencedetected = 0, silencelength = 5;

    int cpupercent = 0, sndSamplesPerSec, sndNumChannels;
    int sndBitsPerSample = 16;

    int deflen = 120, deffade = 4;

    int decode_pos_ms; // current decoding position, in milliseconds

    extern unsigned short soundFinalWave[2304];

    extern int soundBufferLen;
}
/*
extern char soundEcho;
extern char soundLowPass;
extern char soundReverse;
extern char soundQuality;*/

static utils::Fifo<int16_t>* gsfFifo = nullptr;

extern "C" void end_of_track()
{
    // LOGD("END OF TRACK");
}

extern "C" void writeSound(void)
{
    // int tmp;
    gsfFifo->put((short*)soundFinalWave, soundBufferLen / 2);
    decode_pos_ms +=
        (soundBufferLen / (2 * sndNumChannels) * 1000) / sndSamplesPerSec;
}

namespace musix {

class GSFPlayer : public ChipPlayer
{
public:
    explicit GSFPlayer(const std::string& fileName)
        : fifo(512 * 1024), psf{fileName}
    {

        decode_pos_ms = 0;
        TrailingSilence = 1000;
        IgnoreTrackLength = 1;
        DetectSilence = 0;
        silencedetected = 0;
        playforever = 1;

        gsfFifo = &fifo;

        if (psf.valid()) {
            auto& tags = psf.tags();

            int seconds = psf.songLength();

            setMeta("composer", tags["artist"], "sub_title", tags["title"],
                    "game", tags["game"], "format", "Gameboy Advance", "length",
                    seconds);
        }

        LOGD("GSF:{}", fileName.c_str());

        int r = GSFRun(fileName.c_str());
        if (r == 0) {
            throw player_exception("GSFPlugin error: Could not load gsf");
        }
    }

    ~GSFPlayer() override { GSFClose(); }

    int getSamples(int16_t* target, int noSamples) override
    {
        int lastTL = TrackLength;
        int count = 100;
        while (fifo.filled() < noSamples * 2 && count > 0) {
            EmulationLoop();
            count--;
        }
        if (count == 0) { return -1; }

        if (decode_pos_ms > TrackLength && (playforever == 0)) { return -1; }

        if (fifo.filled() == 0) { return 0; }

        int len = fifo.get(target, noSamples);
        return len;
    }

private:
    utils::Fifo<int16_t> fifo;
    PSFFile psf;
};

static const std::set<std::string> supported_ext{"gsf", "minigsf"};

bool GSFPlugin::canHandle(const std::string& name)
{
    auto ext = utils::path_extension(name);
    return supported_ext.count(utils::path_extension(name)) > 0;
}

ChipPlayer* GSFPlugin::fromFile(const std::string& fileName)
{
    return new GSFPlayer{fileName};
};

} // namespace musix
extern "C" void gsfplugin_register()
{
    musix::ChipPlugin::addPluginConstructor([](std::string const& config) {
        return std::make_shared<musix::GSFPlugin>();
    });
}