/// <summary>
/// Helper method that creates a user friendly type from the internal interop structure.
/// </summary>
/// <param name="s">TrackDescriptionStructure from interop</param>
/// <returns>public TrackDescription to be consumed by the user</returns>
internal static MediaTrack Build(this MediaTrackStructure s)
{
AudioTrack audioTrack = default;
VideoTrack videoTrack = default;
SubtitleTrack subtitleTrack = default;
switch (s.TrackType)
{
case TrackType.Audio:
audioTrack = MarshalUtils.PtrToStructure <AudioTrack>(s.TrackData);
break;
case TrackType.Video:
videoTrack = MarshalUtils.PtrToStructure <VideoTrack>(s.TrackData);
break;
case TrackType.Text:
subtitleTrack = MarshalUtils.PtrToStructure <SubtitleTrackStructure>(s.TrackData).Build();
break;
case TrackType.Unknown:
break;
}
return(new MediaTrack(s.Codec,
s.OriginalFourcc,
s.Id,
s.TrackType,
s.Profile,
s.Level,
new MediaTrackData(audioTrack, videoTrack, subtitleTrack), s.Bitrate,
s.Language.FromUtf8(),
s.Description.FromUtf8()));
}
/// <summary>
/// Helper method that mashals a UTF8 native string ptr to a UTF16 managed string.
/// Optionally frees the native string ptr
/// </summary>
/// <param name="nativeString">the native string to marshal to managed</param>
/// <param name="libvlcFree">frees the native pointer of the libvlc string (use only for char*)</param>
/// <returns>a managed UTF16 string</returns>
internal static string FromUtf8(this IntPtr nativeString, bool libvlcFree = false)
{
if (nativeString == IntPtr.Zero)
{
return(null);
}
var length = 0;
while (Marshal.ReadByte(nativeString, length) != 0)
{
length++;
}
byte[] buffer = new byte[length];
Marshal.Copy(nativeString, buffer, 0, buffer.Length);
if (libvlcFree)
{
MarshalUtils.LibVLCFree(ref nativeString);
}
return(Encoding.UTF8.GetString(buffer, 0, buffer.Length));
}
/// <summary>
/// Helper method that creates a user friendly type from the internal interop structure.
/// </summary>
/// <param name="s">TrackDescriptionStructure from interop</param>
/// <returns>public TrackDescription to be consumed by the user</returns>
internal static MediaTrack Build(this MediaTrackStructure s)
{
AudioTrack audioTrack = default;
VideoTrack videoTrack = default;
SubtitleTrack subtitleTrack = default;
switch (s.TrackType)
{
case TrackType.Audio:
audioTrack = MarshalUtils.PtrToStructure <AudioTrack>(s.TrackData);
break;
case TrackType.Video:
videoTrack = MarshalUtils.PtrToStructure <VideoTrack>(s.TrackData);
break;
case TrackType.Text:
subtitleTrack = MarshalUtils.PtrToStructure <SubtitleTrackStructure>(s.TrackData).Build();
break;
case TrackType.Unknown:
break;
}
var language = Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(s.Language) as string;
var des = Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(s.Description) as string;
return(new MediaTrack(s.Codec,
s.OriginalFourcc,
s.Id,
s.TrackType,
s.Profile,
s.Level,
new MediaTrackData(audioTrack, videoTrack, subtitleTrack), s.Bitrate,
language,
des));
}