basic video viewer using fltk & embedded mpv. just drag&drop a folder and use left and right arrow. s to shuffle

pview.cc

// g++ -O2 -s -o pview main.cc -lfltk -lfltk_images -lmpv

#include <stdio.h>

#include <FL/Enumerations.H>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/x.H>

#include <mpv/client.h>

#if __linux__
#include <unistd.h>
#elif _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

class MPVPlayer : public Fl_Window {
public:
  MPVPlayer(int x, int y, int w, int h, const char *label = "")
      : Fl_Window(x, y, w, h, label) {}
  ~MPVPlayer() { mpv_terminate_destroy(mpv); }

  void init() {
    mpv = mpv_create();
    uint64_t wid = fl_xid(this);
    mpv_set_property(mpv, "wid", MPV_FORMAT_INT64, &wid);
    mpv_set_property_string(mpv, "loop-file", "inf");
    mpv_initialize(mpv);
  }

  void startFile(const char *file) {
    const char *mpv_cmd[] = {"loadfile", file, NULL};
    mpv_command(mpv, mpv_cmd);
  }

  void playlistNext() {
    const char *mpv_cmd[] = {"playlist-next", NULL};
    mpv_command(mpv, mpv_cmd);
  }

  void playlistPrev() {
    const char *mpv_cmd[] = {"playlist-prev", NULL};
    mpv_command(mpv, mpv_cmd);
  }

  void playlistShuffle() {
    const char *mpv_cmd[] = {"playlist-shuffle", NULL};
    mpv_command(mpv, mpv_cmd);
  }

  void openFileManager() {
    const char *path = mpv_get_property_string(mpv, "path");

#if __linux__
#define FILE_MANAGER "nemo"
    {
      char cmd[512] = {0};
      sprintf(cmd, "/bin/bash -c '" FILE_MANAGER " \"%s\"'", path);
      FILE *pf = popen(cmd, "r");
      pclose(pf);
    }
#elif _WIN32
    {
      char args[1024] = {0};
      sprintf(args, "/select, \"%s\"", path);
      ShellExecute(NULL, "explorer", args, NULL, NULL, 0);
    }
#else

#endif
    mpv_free((void *)path);
  }

  int handle(int event) override {
    switch (event) {
    case FL_KEYBOARD: {
      switch (Fl::event_key()) {
      case 'n': // fallthrough
      case FL_Right: {
        playlistNext();
      } break;
      case 'p': // fallthrough
      case FL_Left: {
        playlistPrev();
      } break;
      case 's': {
        playlistShuffle();
      } break;
      case 'o': {
        openFileManager();
      } break;
      }
    } break;

    case FL_PASTE: {
      const char *file = Fl::event_text();
      char *fixed = strdup(file);
      size_t len = strlen(fixed);
      fixed[len - 1] = 0;
      startFile(fixed);
      free(fixed);
    }                    // fallthrough
    case FL_DND_DRAG:    // fallthrough
    case FL_DND_ENTER:   // fallthrough
    case FL_DND_LEAVE:   // fallthrough
    case FL_DND_RELEASE: // fallthrough
    case FL_FOCUS:       // fallthrough
      return 1;
    }
    return Fl_Window::handle(event);
  }

private:
  mpv_handle *mpv = nullptr;
};

int main(int argc, char **argv) {
  auto win = Fl_Double_Window(1280, 720, "pview");
  auto player = MPVPlayer(0, 0, 1280, 720);
  win.icon(new Fl_PNG_Image("Awicons-Vista-Artistic-Folder-my-video.256.png"));
  win.add(player);
  win.resizable(player);
  win.show(argc, argv);
  player.init();
  Fl::focus(&player);
  return (Fl::run());
}