private static uint BitmapSize(BITMAPINFOHEADER bih) { uint bis = (uint)((((uint)bih.Width * (uint)bih.BitCount) + 31) & (~31)) / 8; return((uint)((uint)bih.Height * bis)); }
private void GetOutPutCapability() { if (this.iamsc == null) { return; } int iCount = 0, iSize = 0; VIDEO_STREAM_CONFIG_CAPS scc; IntPtr ipscc = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(VIDEO_STREAM_CONFIG_CAPS))); _AMMediaType mt, cmt; IntPtr ipmt = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(_AMMediaType))); IntPtr ipcmt = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(_AMMediaType))); try { // clear output size list first this.OutPutSizeList.Clear(); this.MediaTypeList.Clear(); this.cbxSize.Items.Clear(); iamsc.GetFormat(out ipmt); cmt = (_AMMediaType)Marshal.PtrToStructure(ipmt, typeof(_AMMediaType)); iamsc.GetNumberOfCapabilities(out iCount, out iSize); if (iSize == Marshal.SizeOf(typeof(VIDEO_STREAM_CONFIG_CAPS))) { for (int iFormat = 0; iFormat < iCount; iFormat++) { iamsc.GetStreamCaps(iFormat, out ipmt, ipscc); mt = (_AMMediaType)Marshal.PtrToStructure(ipmt, typeof(_AMMediaType)); scc = (VIDEO_STREAM_CONFIG_CAPS)Marshal.PtrToStructure(ipscc, typeof(VIDEO_STREAM_CONFIG_CAPS)); if ((mt.majortype == cmt.majortype) && (mt.subtype == cmt.subtype) && (mt.formattype == cmt.formattype) && (mt.cbFormat >= Marshal.SizeOf(typeof(VIDEOINFOHEADER))) && (mt.pbFormat != null)) { this.OutPutSizeList.Add(scc.MaxOutputSize); VIDEOINFOHEADER vih = (VIDEOINFOHEADER)Marshal.PtrToStructure(mt.pbFormat, typeof(VIDEOINFOHEADER)); BITMAPINFOHEADER bih = vih.BitmapInfo; bih.Width = scc.MaxOutputSize.Width; bih.Height = scc.MaxOutputSize.Height; bih.SizeImage = BitmapSize(vih.BitmapInfo); vih.BitmapInfo = bih; this.MediaTypeList.Add(mt); this.cbxSize.Items.Add(scc.MaxOutputSize.Width.ToString() + "x" + scc.MaxOutputSize.Height.ToString()); } } } } catch (Exception ex) { MessageBox.Show("Fail to get output size: " + ex.Message); } finally { if (ipcmt != IntPtr.Zero) { Marshal.FreeCoTaskMem(ipcmt); } if (ipscc != IntPtr.Zero) { Marshal.FreeCoTaskMem(ipscc); } if (ipmt != IntPtr.Zero) { Marshal.FreeCoTaskMem(ipmt); } } }