/// <summary>
/// Code taken from Vlc.DotNet
/// </summary>
/// <param name="data"></param>
/// <param name="level"></param>
/// <param name="ctx"></param>
/// <param name="format"></param>
/// <param name="args"></param>
void OnLogInternal(IntPtr data, LogLevel level, IntPtr ctx, string format, IntPtr args)
{
if (_log == null)
{
return;
}
// Original source for va_list handling: https://stackoverflow.com/a/37629480/2663813
var byteLength = Native._vscprintf(format, args) + 1;
var utf8Buffer = Marshal.AllocHGlobal(byteLength);
string formattedDecodedMessage;
try
{
Native.vsprintf(utf8Buffer, format, args);
formattedDecodedMessage = (string)Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(utf8Buffer);
}
finally
{
Marshal.FreeHGlobal(utf8Buffer);
}
GetLogContext(ctx, out var module, out var file, out var line);
// Do the notification on another thread, so that VLC is not interrupted by the logging
Task.Run(() => _log?.Invoke(NativeReference, new LogEventArgs(level, formattedDecodedMessage, module, file, line)));
}
/// <summary>
/// Gets log message debug infos.
///
/// This function retrieves self-debug information about a log message:
/// - the name of the VLC module emitting the message,
/// - the name of the source code module (i.e.file) and
/// - the line number within the source code module.
///
/// The returned module name and file name will be NULL if unknown.
/// The returned line number will similarly be zero if unknown.
/// </summary>
/// <param name="logContext">The log message context (as passed to the <see cref="LogCallback"/>)</param>
/// <param name="module">The module name storage.</param>
/// <param name="file">The source code file name storage.</param>
/// <param name="line">The source code file line number storage.</param>
void GetLogContext(IntPtr logContext, out string module, out string file, out uint?line)
{
Native.LibVLCLogGetContext(logContext, out var modulePtr, out var filePtr, out var linePtr);
line = linePtr == UIntPtr.Zero ? null : (uint?)linePtr.ToUInt32();
module = Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(modulePtr) as string;
file = Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(filePtr) as string;
}
/// <summary>Read the meta of the media.</summary>
/// <param name="metadataType">the meta to read</param>
/// <returns>the media's meta</returns>
/// <remarks>
/// If the media has not yet been parsed this will return NULL.
/// </remarks>
public string Meta(MetadataType metadataType)
{
var metaPtr = Internal.LibVLCMediaGetMeta(NativeReference, metadataType);
if (metaPtr == IntPtr.Zero)
{
return(string.Empty);
}
return(Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(metaPtr) as string);
}
/// <summary> /// Get the name of a particular equalizer preset. /// This name can be used, for example, to prepare a preset label or menu in a user interface. /// </summary> /// <param name="index">index of the preset, counting from zero</param> /// <returns>preset name, or empty string if there is no such preset</returns> public string PresetName(uint index) => (string)Utf8StringMarshaler.GetInstance().MarshalNativeToManaged(Native.LibVLCAudioEqualizerGetPresetName(index));
