internal T GetInteropDelegate <T>()
{
string vlcFunctionName = null;
try
{
#if NETSTANDARD1_3
var attrs = typeof(T).GetTypeInfo().GetCustomAttributes(typeof(LibVlcFunctionAttribute), false).ToArray();
#else
var attrs = typeof(T).GetCustomAttributes(typeof(LibVlcFunctionAttribute), false);
#endif
if (attrs.Length == 0)
{
throw new Exception("Could not find the LibVlcFunctionAttribute.");
}
var attr = (LibVlcFunctionAttribute)attrs[0];
vlcFunctionName = attr.FunctionName;
lock (this._myInteropDelegatesLockObject)
{
if (myInteropDelegates.ContainsKey(vlcFunctionName))
{
return((T)myInteropDelegates[attr.FunctionName]);
}
var procAddress = Win32Interops.GetProcAddress(myLibVlcDllHandle, attr.FunctionName);
if (procAddress == IntPtr.Zero)
{
throw new Win32Exception();
}
var delegateForFunctionPointer = MarshalHelper.GetDelegateForFunctionPointer <T>(procAddress);
myInteropDelegates[attr.FunctionName] = delegateForFunctionPointer;
return(delegateForFunctionPointer);
}
}
catch (Win32Exception e)
{
throw new MissingMethodException(string.Format("The address of the function '{0}' does not exist in libvlc library.", vlcFunctionName), e);
}
}
/// <summary>
/// Register callbacks in order to handle VLC dialogs. LibVLC 3.0.0 and later.
/// </summary>
public void SetDialogCallbacks(DialogCallbacks?callbacks, IntPtr data)
{
if (VlcVersionNumber.Major < 3)
{
throw new InvalidOperationException($"You need VLC version 3.0 or higher to be able to use {nameof(SetDialogCallbacks)}");
}
if (this.dialogCallbacks.HasValue)
{
Marshal.FreeHGlobal(this.dialogCallbacksPointer);
this.dialogCallbacksPointer = IntPtr.Zero;
}
this.dialogCallbacks = callbacks;
if (this.dialogCallbacks.HasValue)
{
this.dialogCallbacksPointer = Marshal.AllocHGlobal(MarshalHelper.SizeOf <DialogCallbacks>());
Marshal.StructureToPtr(this.dialogCallbacks.Value, this.dialogCallbacksPointer, false);
}
myLibraryLoader.GetInteropDelegate <SetDialogCallbacks>().Invoke(this.myVlcInstance, this.dialogCallbacksPointer, data);
}
public MediaTrack[] GetMediaTracks(VlcMediaInstance mediaInstance)
{
if (mediaInstance == IntPtr.Zero)
{
throw new ArgumentException("Media instance is not initialized.");
}
var cpt = GetInteropDelegate <GetMediaTracks>().Invoke(mediaInstance, out var fullBuffer);
if (cpt <= 0)
{
return(new MediaTrack[0]);
}
try
{
var result = new MediaTrack[cpt];
for (int index = 0; index < cpt; index++)
{
var current = MarshalHelper.PtrToStructure <LibvlcMediaTrackT>(Marshal.ReadIntPtr(fullBuffer, index * MarshalHelper.SizeOf <IntPtr>()));
TrackInfo trackInfo = null;
switch (current.Type)
{
case MediaTrackTypes.Audio:
var audio = MarshalHelper.PtrToStructure <LibvlcAudioTrackT>(current.TypedTrack);
trackInfo = new AudioTrack
{
Channels = audio.Channels,
Rate = audio.Rate
};
break;
case MediaTrackTypes.Video:
var video = MarshalHelper.PtrToStructure <LibvlcVideoTrackT>(current.TypedTrack);
trackInfo = new VideoTrack
{
Height = video.Height,
Width = video.Width,
SarNum = video.SarNum,
SarDen = video.SarDen,
FrameRateNum = video.FrameRateNum,
FrameRateDen = video.FrameRateDen,
Orientation = video.Orientation,
Projection = video.Projection,
Pose = video.Pose
};
break;
case MediaTrackTypes.Text:
var text = MarshalHelper.PtrToStructure <LibvlcSubtitleTrackT>(current.TypedTrack);
trackInfo = new SubtitleTrack
{
Encoding = Utf8InteropStringConverter.Utf8InteropToString(text.Encoding)
};
break;
}
result[index] = new MediaTrack
{
CodecFourcc = current.Codec,
OriginalFourcc = current.OriginalFourCC,
Id = current.Id,
Type = current.Type,
Profile = current.Profile,
Level = current.Level,
TrackInfo = trackInfo,
Bitrate = current.Bitrate,
Language = Utf8InteropStringConverter.Utf8InteropToString(current.Language),
Description = Utf8InteropStringConverter.Utf8InteropToString(current.Description)
};
}
return(result);
}
finally
{
GetInteropDelegate <ReleaseMediaTracks>().Invoke(fullBuffer, cpt);
}
}