public override bool Build(DirectShowLib.IPin source, IBuild build)
{
this.build = build;
this.build.OnClose += this.Dispose;
bool result;
if (result = base.Build(source, build))
{
DirectShowLib.AMMediaType media = new DirectShowLib.AMMediaType();
Exception.GraphError.Check((this.grabber as DirectShowLib.ISampleGrabber).GetConnectedMediaType(media));
DirectShowLib.VideoInfoHeader header = (DirectShowLib.VideoInfoHeader)System.Runtime.InteropServices.Marshal.PtrToStructure(media.formatPtr, typeof(DirectShowLib.VideoInfoHeader));
this.size = new Geometry2D.Integer.Size(header.BmiHeader.Width, header.BmiHeader.Height);
this.lifetime = header.AvgTimePerFrame;
// NOTE!!!! Here we set a default frame rate if the video does not have such information available.
if (this.lifetime < 1000 || this.lifetime > 10000000)
{
this.lifetime = 400000;
}
if (this.Rate.NotNull())
{
double factor = (double)this.Rate / (1000 / new TimeSpan(this.lifetime).TotalMilliseconds);
int code = (this.build.Graph as DirectShowLib.IMediaSeeking).SetRate(factor);
}
}
return(result);
}
bool SetFormat(DirectShowLib.IBaseFilter filter)
{
bool result = false;
Format.Image wanted = this.Media(filter);
if (wanted.NotNull())
{
if (wanted.Resolution.NotNull())
{
DirectShowLib.AMMediaType[] media = this.GetOutputMediaTypes(filter);
if (media.NotNull())
{
for (int i = 0; i < media.Length; i++)
{
DirectShowLib.VideoInfoHeader header = Abstract.GetHeader(media[i]);
if (media[i].subType == wanted.Type &&
header.BmiHeader.Width == wanted.Resolution.Width)
{
if (header.BmiHeader.Height == wanted.Resolution.Height)
{
this.SetOutputMedia(filter, media[i]);
result = true;
break;
}
else if (wanted.ForceHeight)
{
header.BmiHeader.Height = wanted.Resolution.Height;
header.BmiHeader.ImageSize = header.BmiHeader.Width * header.BmiHeader.Height * header.BmiHeader.BitCount / 8;
header.BitRate = (int)((10000000 / header.AvgTimePerFrame) * header.BmiHeader.ImageSize * 8);
Abstract.SetHeader(media[i], header);
media[i].sampleSize = header.BmiHeader.ImageSize;
this.SetOutputMedia(filter, media[i]);
result = true;
break;
}
}
}
}
}
else
{
result = true;
}
}
return(result);
}
protected static void SetHeader(DirectShowLib.AMMediaType media, DirectShowLib.VideoInfoHeader header)
{
System.Runtime.InteropServices.Marshal.StructureToPtr(header, media.formatPtr, true);
}
