private void WriteTrackInfo(IntPtr tagsPtr, IntPtr trackInfoPtr)
{
if (this.TrackNumber == null && this.TotalTracks == null)
{
NativeMethods.MP4TagsSetTrack(tagsPtr, IntPtr.Zero);
}
else
{
NativeMethods.MP4TagTrack trackInfo = new NativeMethods.MP4TagTrack();
if (trackInfoPtr != IntPtr.Zero)
{
trackInfo = trackInfoPtr.ReadStructure <NativeMethods.MP4TagTrack>();
}
if (this.TrackNumber.Value != trackInfo.index || this.TotalTracks != trackInfo.total)
{
trackInfo.index = (this.TrackNumber == null ? (short)0 : this.TrackNumber.Value);
trackInfo.total = (this.TotalTracks == null ? (short)0 : this.TotalTracks.Value);
IntPtr trackPtr = Marshal.AllocHGlobal(Marshal.SizeOf(trackInfo));
Marshal.StructureToPtr(trackInfo, trackPtr, false);
NativeMethods.MP4TagsSetTrack(tagsPtr, trackPtr);
Marshal.FreeHGlobal(trackPtr);
}
}
}
private void ReadTrackInfo(IntPtr trackInfoPointer)
{
if (trackInfoPointer == IntPtr.Zero)
{
return;
}
NativeMethods.MP4TagTrack trackInfo = trackInfoPointer.ReadStructure <NativeMethods.MP4TagTrack>();
this.TrackNumber = trackInfo.index;
this.TotalTracks = trackInfo.total;
}
