public RawPreviewData GetPreview(PreviewSettings settings, int previewNumber, bool deinterlace)
{
SourceTitle title = this.Titles.TitleList.FirstOrDefault(t => t.Index == settings.TitleNumber);
// Create the Expected Output Geometry details for libhb.
hb_geometry_settings_s uiGeometry = new hb_geometry_settings_s
{
crop = new[] { settings.Cropping.Top, settings.Cropping.Bottom, settings.Cropping.Left, settings.Cropping.Right },
itu_par = 0,
keep = (int)AnamorphicFactory.KeepSetting.HB_KEEP_WIDTH + (settings.KeepDisplayAspect ? 0x04 : 0), // TODO Keep Width?
maxWidth = settings.MaxWidth,
maxHeight = settings.MaxHeight,
mode = (int)(hb_anamorphic_mode_t)settings.Anamorphic,
modulus = settings.Modulus ?? 16,
geometry = new hb_geometry_s
{
height = settings.Height,
width = settings.Width,
par = settings.Anamorphic != Anamorphic.Custom && settings.Anamorphic != Anamorphic.Automatic
? new hb_rational_t {
den = title.Geometry.PAR.Den, num = title.Geometry.PAR.Num
}
: new hb_rational_t {
den = settings.PixelAspectY, num = settings.PixelAspectX
}
}
};
// Fetch the image data from LibHb
IntPtr resultingImageStuct = hbFunctions.hb_get_preview2(this.Handle, settings.TitleNumber, previewNumber, ref uiGeometry, deinterlace ? 1 : 0);
hb_image_s image = InteropUtilities.ToStructureFromPtr <hb_image_s>(resultingImageStuct);
// Copy the filled image buffer to a managed array.
int stride_width = image.plane[0].stride;
int stride_height = image.plane[0].height_stride;
int imageBufferSize = stride_width * stride_height; // int imageBufferSize = outputWidth * outputHeight * 4;
byte[] managedBuffer = new byte[imageBufferSize];
Marshal.Copy(image.plane[0].data, managedBuffer, 0, imageBufferSize);
RawPreviewData preview = new RawPreviewData(managedBuffer, stride_width, stride_height, image.width, image.height);
// Close the image so we don't leak memory.
IntPtr nativeJobPtrPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(IntPtr)));
Marshal.WriteIntPtr(nativeJobPtrPtr, resultingImageStuct);
hbFunctions.hb_image_close(nativeJobPtrPtr);
Marshal.FreeHGlobal(nativeJobPtrPtr);
return(preview);
}