looper/playback.h

#pragma once
#include "config.h"
#include "SDL_mixer.h"
#include <thread>
#include <SDL.h>
#include <SDL_audio.h>
#include <string>
#include <atomic>
#include <mutex>
#include <SoundTouch.h>
#include <span>
#include <optional>
using namespace soundtouch;
using std::span;
using std::optional;
class Playback {
private:
    std::string filePath;
    std::atomic_bool running;
    std::atomic_bool file_changed;
    std::atomic_bool seeking;
    std::atomic_bool update;
    std::atomic_bool restart;
    std::atomic_bool playback_ready;
    std::mutex flag_mutex;
    std::thread thread;
    double position;
    double length;
    bool paused;
    Uint8* buf;
    size_t bufsize;
    Mix_CommonMixer_t general_mixer;
    SDL_AudioDeviceID device;
    SoundTouch *st;
    SDL_AudioSpec spec;
    /// @brief A fake SDL_AudioSpec used to trick SDL Mixer X into allocating a bigger buffer.
    SDL_AudioSpec fakespec;
    void SDLCallbackInner(Uint8 *stream, int len);
    static void SDLCallback(void *userdata, Uint8 *stream, int len);
    Mix_Music *Load(const char* file);
    void Unload(Mix_Music* music);
    void ThreadFunc();
    void UpdateST();
    double GetMaxSeconds();
public:
    Playback();
    ~Playback();
    double GetPosition();
    double GetLength();
    void Seek(double position);
    void Start(std::string filePath);
    bool IsPaused();
    void Pause();
    void Stop();
    void Update();
    bool IsStopped();
    float volume;
    float speed;
    float tempo;
    float pitch;
    double MaxSeconds = 100.0;
    double MaxSpeed = 4.0;
    double MaxPitch = 4.0;
    double MaxTempo = 4.0;
    double MinSpeed = 0.25;
    double MinPitch = 0.25;
    double MinTempo = 0.25;
};