Question

我在GTK＃中使用LibVLC.NET包装器。我已经使用这个例子播放了视频：

LibVLCLibrary library = LibVLCLibrary.Load(null);
IntPtr inst, mp, m;

inst = library.libvlc_new();                                      // Load the VLC engine 
m = library.libvlc_media_new_location(inst, "path/to/your/file"); // Create a new item 
mp = library.libvlc_media_player_new_from_media(m);               // Create a media player playing environement 
library.libvlc_media_release(m);                                  // No need to keep the media now 
library.libvlc_media_player_play(mp);                             // play the media_player 
Thread.Sleep(10000);                                              // Let it play a bit 
library.libvlc_media_player_stop(mp);                             // Stop playing 
library.libvlc_media_player_release(mp);                          // Free the media_player 
library.libvlc_release(inst);

LibVLCLibrary.Free(library);

但是在另一个新窗口中播放视频，现在我需要在GTK中设置窗口或（更好）容器来播放视频。我该怎么做？

更新我在LibVLC.NET中找到了这个函数：

 //==========================================================================
// void libvlc_video_set_format_callbacks (libvlc_media_player_t *mp, libvlc_video_format_cb setup, libvlc_video_cleanup_cb cleanup)

//==========================================================================
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate uint libvlc_video_format_cb(ref IntPtr opaque, ref uint chroma, ref uint width, ref uint height, ref uint pitches, ref uint lines);

//==========================================================================
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void libvlc_video_cleanup_cb(IntPtr opaque);

//==========================================================================
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate void libvlc_video_set_format_callbacks_signature(IntPtr mp, libvlc_video_format_cb setup, libvlc_video_cleanup_cb cleanup);

//==========================================================================
private readonly libvlc_video_set_format_callbacks_signature m_libvlc_video_set_format_callbacks;

//==========================================================================
public void libvlc_video_set_format_callbacks(IntPtr mp, libvlc_video_format_cb setup, libvlc_video_cleanup_cb cleanup)
{
  VerifyAccess();

  m_libvlc_video_set_format_callbacks(mp, setup, cleanup);
}

/*
  void libvlc_media_player_set_nsobject (libvlc_media_player_t *p_mi, void *drawable)
  void * libvlc_media_player_get_nsobject (libvlc_media_player_t *p_mi)
  void libvlc_media_player_set_agl (libvlc_media_player_t *p_mi, uint32_t drawable)
  uint32_t libvlc_media_player_get_agl (libvlc_media_player_t *p_mi)
  void libvlc_media_player_set_xwindow (libvlc_media_player_t *p_mi, uint32_t drawable)
  uint32_t libvlc_media_player_get_xwindow (libvlc_media_player_t *p_mi)
  void libvlc_media_player_set_hwnd (libvlc_media_player_t *p_mi, void *drawable)
  void * libvlc_media_player_get_hwnd (libvlc_media_player_t *p_mi)
*/

在评论中提到libvlc_media_player_set_hwnd（），可能是这个函数以某种方式替换它或者提供与libvlc_media_player_set_hwnd（）相同的机会？

Answer 1

根据平台的不同，您需要调用libvlc_media_player_set_xwindow（Linux），libvlc_media_player_set_hwnd（Windows）或libvlc_media_player_set_nsobject（OSX）。

第二个参数是一个整数，它是您要嵌入视频的本机组件的句柄。

像GTK / GTK＃这样的工具包应该在组件上提供一个方法，使您能够获得此窗口处理程序。

例如，这个C＃代码可用于从GTK Widget获取所需的窗口句柄

private static Int32 Wid(Widget widget) {
    IntPtr windowPtr = gtk_widget_get_window(widget.Handle);
    if(windowPtr != IntPtr.Zero) {
        IntPtr xidPtr = gdk_x11_drawable_get_xid(windowPtr);
        if(xidPtr != IntPtr.Zero) {
            return xidPtr.ToInt32();
        }
    }
    return 0;
}

创建媒体播放器和本机组件后，您只需要执行此操作一次，每次播放媒体时都不需要这样做。

GTK中的LibVLC.NET＃

1 个答案: