[Windows Mobile] Capturing video from device camera C# or DirectShow.NET CF Part II
Posted on June 1st, 2009 by admin
In previous post i explained how to play video or audio on Windows Mobile devices using DirectShow.
I`ve received some emails with request to explain how preview video from device camera.
First of all in Windows Mobile SDK in examples you can find C++ exmaple. I`ve seen examples that suggest to compile example from SDK to dll and than importing methos from that dll watch camera preview. I did little bit more, i ported whole code to C# so we dont need any dll. So what do we need? we need import 3 api methods, FindFirstDevice, FindClose and GetClientRect
[DllImport("coredll.dll")]
public static extern int GetClientRect(
[In] IntPtr hWnd,
[Out] out Rect lpRect);
[DllImport("coredll.dll")]
public static extern IntPtr FindFirstDevice(
[In] int searchType,
[In] IntPtr searchParam,
[In, Out] ref DEVMGR_DEVICE_INFORMATION pdi);
[DllImport("coredll.dll")]
public static extern int FindClose([In] IntPtr hFindFile);
also we need 6 more Com Interfaces:
IVideoWindow, IBaseFilter, IPersist, IPersistPropertyBag, IPropertyBag, ICaptureGraphBuilder2
[ComVisible(true), ComImport,
Guid("56A868B4-0AD4-11CE-B03A-0020AF0BA770"),
InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface IVideoWindow
{
[PreserveSig]
int put_Caption([In] string caption);
[PreserveSig]
int get_Caption([Out] out string caption);
[PreserveSig]
int put_WindowStyle([In] int windowStyle);
[PreserveSig]
int get_WindowStyle([Out] out int windowStyle);
[PreserveSig]
int put_WindowStyleEx([In] int windowStyleEx);
[PreserveSig]
int get_WindowStyleEx(out int windowStyleEx);
[PreserveSig]
int put_AutoShow([In] int autoShow);
[PreserveSig]
int get_AutoShow([Out] out int autoShow);
[PreserveSig]
int put_WindowState([In] int windowState);
[PreserveSig]
int get_WindowState([Out] out int windowState);
[PreserveSig]
int put_BackgroundPalette([In] int backgroundPalette);
[PreserveSig]
int get_BackgroundPalette([Out] out int backgroundPalette);
[PreserveSig]
int put_Visible([In] int visible);
[PreserveSig]
int get_Visible([Out] out int visible);
[PreserveSig]
int put_Left([In] int left);
[PreserveSig]
int get_Left([Out] out int left);
[PreserveSig]
int put_Width([In] int width);
[PreserveSig]
int get_Width([Out] out int width);
[PreserveSig]
int put_Top([In] int top);
[PreserveSig]
int get_Top([Out] out int top);
[PreserveSig]
int put_Height([In] int height);
[PreserveSig]
int get_Height([Out] out int height);
[PreserveSig]
int put_Owner([In] IntPtr owner);
[PreserveSig]
int get_Owner([Out] out IntPtr owner);
[PreserveSig]
int put_MessageDrain([In] IntPtr drain);
[PreserveSig]
int get_MessageDrain([Out] out IntPtr drain);
[PreserveSig]
int get_BorderColor([Out] out int color);
[PreserveSig]
int put_BorderColor([In] int color);
[PreserveSig]
int get_FullScreenMode([Out] out int fullScreenMode);
[PreserveSig]
int put_FullScreenMode([In] int fullScreenMode);
[PreserveSig]
int SetWindowForeground([In] int focus);
[PreserveSig]
int NotifyOwnerMessage(
[In] IntPtr hwnd,
[In] int msg,
[In] IntPtr wParam,
[In] IntPtr lParam);
[PreserveSig]
int SetWindowPosition(
[In] int left,
[In] int top,
[In] int width,
[In] int height);
[PreserveSig]
int GetWindowPosition(
[Out] out int left,
[Out] out int top,
[Out] out int width,
[Out] out int height);
[PreserveSig]
int GetMinIdealImageSize(
[Out] out int width,
[Out] out int height);
[PreserveSig]
int GetMaxIdealImageSize(
[Out] out int width,
[Out] out int height);
[PreserveSig]
int GetRestorePosition(
[Out] out int left,
[Out] out int top,
[Out] out int width,
[Out] out int height);
[PreserveSig]
int HideCursor([In] int hideCursor);
[PreserveSig]
int IsCursorHidden([Out] out int hideCursor);
}
[ComVisible(true), ComImport,
Guid("56A86895-0AD4-11CE-B03A-0020AF0BA770"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IBaseFilter
{
[PreserveSig]
int GetClassID([Out] out Guid pClassID);
[PreserveSig]
int Stop();
[PreserveSig]
int Pause();
[PreserveSig]
int Run([In] long tStart);
[PreserveSig]
int GetState(
[In] int dwMilliSecsTimeout,
[Out] out int filtState);
[PreserveSig]
int SetSyncSource([In, MarshalAs(UnmanagedType.Interface)] object pClock);
/// <summary>
///
/// </summary>
[PreserveSig]
int GetSyncSource([Out, MarshalAs(UnmanagedType.Interface)] out object pClock);
[PreserveSig]
int EnumPins([Out, MarshalAs(UnmanagedType.Interface)] out object ppEnum);
[PreserveSig]
int FindPin(
[In, MarshalAs(UnmanagedType.LPWStr)] string Id,
[Out, MarshalAs(UnmanagedType.Interface)] out object ppPin);
[PreserveSig]
int QueryFilterInfo([Out] IntPtr pInfo);
[PreserveSig]
int JoinFilterGraph(
[In, MarshalAs(UnmanagedType.Interface)] object pGraph,
[In, MarshalAs(UnmanagedType.LPWStr)] string pName);
[PreserveSig]
int QueryVendorInfo(
[Out, MarshalAs(UnmanagedType.LPWStr)] out string pVendorInfo);
}
[ComVisible(true), ComImport,
Guid("0000010C-0000-0000-C000-000000000046"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IPersist
{
[PreserveSig]
int GetClassID([Out] out Guid pClassID);
}
[ComVisible(true), ComImport,
Guid("37D84F60-42CB-11CE-8135-00AA004BB851"),//Guid("5738E040-B67F-11d0-BD4D-00A0C911CE86"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IPersistPropertyBag : IPersist
{
#region IPersist
[PreserveSig]
new int GetClassID([Out] out Guid pClassID);
#endregion
[PreserveSig]
int InitNew();
[PreserveSig]
int Load(
[In] IPropertyBag pPropBag,
[In, MarshalAs(UnmanagedType.Interface)] object pErrorLog
);
[PreserveSig]
int Save(
IPropertyBag pPropBag,
[In, MarshalAs(UnmanagedType.Bool)] bool fClearDirty,
[In, MarshalAs(UnmanagedType.Bool)] bool fSaveAllProperties
);
}
[ComVisible(true), ComImport,
Guid("55272A00-42CB-11CE-8135-00AA004BB851"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IPropertyBag
{
[PreserveSig]
int Read(
[In, MarshalAs(UnmanagedType.LPWStr)] string pszPropName,
[In, Out, MarshalAs(UnmanagedType.Struct)] ref object pVar,
[In] IntPtr pErrorLog);
[PreserveSig]
int Write(
[In, MarshalAs(UnmanagedType.LPWStr)] string pszPropName,
[In, MarshalAs(UnmanagedType.Struct)] ref object pVar);
}
[ComVisible(true), ComImport,
Guid("93E5A4E0-2D50-11D2-ABFA-00A0C9C6E38D"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface ICaptureGraphBuilder2
{
[PreserveSig]
int SetFiltergraph([In] IGraphBuilder pfg);
[PreserveSig]
int GetFiltergraph([Out] out IGraphBuilder ppfg);
[PreserveSig]
int SetOutputFileName(
[In] ref Guid pType,
[In, MarshalAs(UnmanagedType.LPWStr)] string lpstrFile,
[Out] out IBaseFilter ppbf,
[Out, MarshalAs(UnmanagedType.Interface)] out object ppSink);
[PreserveSig]
int FindInterface(
[In] ref CGuid pCategory,
[In] ref CGuid pType,
[In] IBaseFilter pbf,
[In] ref Guid riid,
[Out, MarshalAs(UnmanagedType.IUnknown)] out object ppint);
[PreserveSig]
int RenderStream(
[In, MarshalAs(UnmanagedType.LPStruct)] CGuid PinCategory,
[In, MarshalAs(UnmanagedType.LPStruct)] CGuid MediaType,
[In, MarshalAs(UnmanagedType.IUnknown)] object pSource,
[In] IBaseFilter pfCompressor,
[In] IBaseFilter pfRenderer
);
[PreserveSig]
int ControlStream(
[In] ref CGuid pCategory,
[In] ref CGuid pType,
[In] IBaseFilter pFilter,
[In] IntPtr pstart,
[In] IntPtr pstop,
[In] short wStartCookie,
[In] short wStopCookie);
[PreserveSig]
int AllocCapFile(
[In, MarshalAs(UnmanagedType.LPWStr)] string lpstrFile,
[In] long dwlSize);
[PreserveSig]
int CopyCaptureFile(
[In, MarshalAs(UnmanagedType.LPWStr)] string lpwstrOld,
[In, MarshalAs(UnmanagedType.LPWStr)] string lpwstrNew,
[In] int fAllowEscAbort,
[In, MarshalAs(UnmanagedType.Interface)] object pFilter);
[PreserveSig]
int FindPin(
[In] object pSource,
[In] int pindir,
[In] ref CGuid pCategory,
[In] ref CGuid pType,
[In, MarshalAs(UnmanagedType.Bool)] bool fUnconnected,
[In] int num,
[Out, MarshalAs(UnmanagedType.Interface)] out object ppPin);
}
Everything else the same as in SDK example + i made class to hide directshow from cant or not going to understand it 
Class got 3 public methods:
init() - inits camera and builds graph
release() - stops preview and releases all com objects
run(IntPtr owner) - start preview on control
using System;
using System.Runtime.InteropServices;
namespace DirectShowNETCF
{
public class CCamera
{
private IBaseFilter video = null;
private IBaseFilter renderer = null;
private ICaptureGraphBuilder2 capGraph = null;
private IGraphBuilder graph = null;
private IVideoWindow window = null;
private IMediaControl control = null;
public CCamera()
{
}
~CCamera()
{
release();
}
public bool init()
{
object obj = null;
#region FilterGraph
Guid clsid = CLSID_.FilterGraph;
Guid riid = IID_.IFilterGraph2;
PInvoke.CoCreateInstance(ref clsid, IntPtr.Zero, (uint)CLSCTX_.INPROC_SERVER, ref riid, out obj);
graph = (IGraphBuilder)obj;
if (graph == null)
{
return false;
}
#endregion
obj = null;
#region CaptureGraph
clsid = CLSID_.CaptureGraphBuilder;
riid = IID_.ICaptuGraphBuilder2;
PInvoke.CoCreateInstance(ref clsid, IntPtr.Zero, (uint)CLSCTX_.INPROC_SERVER, ref riid, out obj);
capGraph = (ICaptureGraphBuilder2)obj;
if (capGraph == null)
{
return false;
}
#endregion
obj = null;
int hr = capGraph.SetFiltergraph(graph);
if (hr < 0)
{
return false;
}
if (!getVideoCaptureFilter())
{
return false;
}
hr = graph.AddFilter(video, "Video Capture");
if (hr < 0)
{
return false;
}
if (!getVideoRenderer())
{
return false;
}
hr = graph.AddFilter(renderer, "Video Renderer");
if (hr < 0)
{
return false;
}
hr = capGraph.RenderStream(null, null, video, null, renderer);
if (hr < 0)
{
return false;
}
control = (IMediaControl)graph;
return true;
}
public void release()
{
if (control != null)
{
control.Stop();
}
if (window != null)
{
window.put_Owner(IntPtr.Zero);
window.put_Visible(-1);
}
if (capGraph != null)
{
Marshal.ReleaseComObject(capGraph);
capGraph = null;
}
if (graph != null)
{
Marshal.ReleaseComObject(graph);
graph = null;
control = null;
}
if (video != null)
{
Marshal.ReleaseComObject(video);
video = null;
}
if (renderer != null)
{
Marshal.ReleaseComObject(renderer);
renderer = null;
window = null;
}
}
public bool run(IntPtr owner)
{
if (window != null)
{
Rect rc = new Rect();
PInvoke.GetClientRect(owner, out rc);
window.put_Owner(owner);
window.SetWindowPosition(rc.Left, rc.Top, rc.Right, rc.Bottom);
window.put_WindowStyle(0x40000000 | 0x02000000);
window.put_Visible(0);
}
else
{
return false;
}
return control.Run() >= 0;
}
private bool getVideoCaptureFilter()
{
object obj = null;
Guid clsid = CLSID_.VideoCapture;
Guid riid = IID_.IBaseFilter;
PInvoke.CoCreateInstance(ref clsid, IntPtr.Zero, (uint)CLSCTX_.INPROC_SERVER, ref riid, out obj);
if (obj == null)
{
return false;
}
video = (IBaseFilter)obj;
obj = null;
string name_ = "";
if (!getName(ref name_))
{
return false;
}
IPersistPropertyBag propBag = (IPersistPropertyBag)video;
if (propBag == null)
{
return false;
}
CPropertyBag bag = new CPropertyBag();
object oname = name_;
bag.Write("VCapName", ref oname);
int hr = propBag.Load(bag, null);
if (hr < 0)
{
//System.Windows.Forms.MessageBox.Show("cannot load prop bag");
return false;
}
return true;
}
private bool getVideoRenderer()
{
object obj = null;
Guid clsid = CLSID_.VideoRenderer;
Guid riid = IID_.IBaseFilter;
PInvoke.CoCreateInstance(ref clsid, IntPtr.Zero, (uint)CLSCTX_.INPROC_SERVER, ref riid, out obj);
if (obj == null)
{
return false;
}
renderer = (IBaseFilter)obj;
window = (IVideoWindow)renderer;
return true;
}
private bool getName(ref string name)
{
IntPtr handle = IntPtr.Zero;
IntPtr guid = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Guid)));
Marshal.StructureToPtr(CLSID_.Camera, guid, false);
DEVMGR_DEVICE_INFORMATION di = new DEVMGR_DEVICE_INFORMATION();
di.dwSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(typeof(DEVMGR_DEVICE_INFORMATION));
handle = PInvoke.FindFirstDevice(3, guid, ref di);
Marshal.FreeHGlobal(guid);
if ((handle == IntPtr.Zero)||(di.hDevice == IntPtr.Zero))
{
return false;
}
PInvoke.FindClose(handle);
name = di.szLegacyName;
return true;
}
}
public class CPropertyBag : IPropertyBag
{
private object pVar_ = null;
public CPropertyBag()
{
pVar_ = new object();
}
~CPropertyBag()
{
pVar_ = null;
}
public int Read(
[In, MarshalAs(UnmanagedType.LPWStr)] string pszPropName,
[In, Out, MarshalAs(UnmanagedType.Struct)] ref object pVar,
[In] IntPtr pErrorLog)
{
pVar = pVar_;
return 0;
}
public int Write(
[In, MarshalAs(UnmanagedType.LPWStr)] string pszPropName,
[In, MarshalAs(UnmanagedType.Struct)] ref object pVar)
{
pVar_ = pVar;
return 0;
}
}
}
Last version of DirectShowNETCF
Filed under: Programming
June 6th, 2009 at 3:37 pm
Cool. But it would be nice if you provide some screenshots
June 6th, 2009 at 4:34 pm
it wont work on emulator, so max what i can do its picture my cell
anyway thatks for suggestion
June 9th, 2009 at 2:14 pm
Hello, thank you very much for the application.
In particular I would like to save the contents of the panel (video recording)
You can do this?
Thank you
June 9th, 2009 at 5:53 pm
Yes i can
June 9th, 2009 at 6:30 pm
Can you tell me how please?
thanks for reply
June 9th, 2009 at 6:39 pm
You should connect Video Capture filter to video encoder video encoder to avi (asf) mux and then to file writer, thats all.
if you need preview and record you have to Inf Tee filter
If you need just capture frames from time to time use ImageSinkFilter
June 9th, 2009 at 6:48 pm
Thank you very much again, I did not understand anything, I am amateur in mobile programming,can you put some code to understand it better?
Some day you do some example? Would be appreciated greatly.
Thanks for answering
June 11th, 2009 at 9:33 am
I downloaded the code, i could view the video frames. My question is how do I implement the camera capture (still Image)? Once I focus the camera on the target, how do i capture the image? A response would be appreciated. Thanks.
June 11th, 2009 at 9:54 am
I`m going to write next article about that, but dont have enough time now… may be next week.
Regards,
Alex
June 12th, 2009 at 8:29 pm
I downloaded your code, works great on a WM6 device I am developing with. Also nice job on the port to C#. I am new to directshow programming and have managed to piece together a preview and still capture application in VB .NET with the bulk of the work done using directshow in a native C++ DLL, however, the still capture filter (ImageSinkFilter) is too slow for my requrements. I have tried with no success to implement a custom sample grabber filter as a faster alternative…so I am looking forward to article Part III or IV that will hoping shed some light on things. Also it would be great to see IAMStreamConfig and IAMCameraControl interfaces ported to C# as well.
June 13th, 2009 at 3:35 pm
KenG can you share your progress?
June 15th, 2009 at 5:13 pm
James, Alex’s DirectShowNETCF.dll functionally does 99% of what i did using C++ directshow api calls. See part III comments. The ability to set resolution (size of image captured) and turning camera flash on and off is the only features missing. Hopefully, he will add those features in future releases of the DLL.
June 29th, 2009 at 6:24 am
Hi Alex, thanks for the great program. Can I send out the video via wifi to another smartphone while previewing? Any pointers on how to do that? Thanks.
June 29th, 2009 at 10:36 am
Yes, you can! you have to connect camera filter to video encoder, than encoder to samplegrabber than samplegrabber to nullrenderer. You wil receive encoded frames in samplegrabber and you will be able to send it using sockets
August 8th, 2009 at 4:42 pm
I am poor english. I hope you would understand…
i wish save avi file from camera. so add the Arcsoft Mpeg-4 DMO Class filter.
and called capGraph.SetOutputFileName(.., .., .., .., ..)
but don’t save file.
attached the a part source.
=======================================================
……..
……
….
control = (IMediaControl)graph;
int hr = capGraph.SetFiltergraph(graph);
if (!getVideoCaptureFilter(box))
{
return false;
}
hr = graph.AddFilter(video, “Video Capture”);
clsid = new Guid(”{E3116EB9-2128-4bee-B267-41B9E44D1150}”); // ArcSoft MPEG-4 Encode DMO Class
riid = IID_.IBaseFilter;
PInvoke.CoCreateInstance(ref clsid, IntPtr.Zero, (uint)CLSCTX_.INPROC_SERVER, ref riid, out obj);
mpeg4 = (IBaseFilter)obj;
obj = null;
hr = graph.AddFilter(mpeg4, “ArcSoft MPEG-4 Encode DMO Class”);
if (!getVideoRenderer())
{
return false;
}
hr = graph.AddFilter(renderer, “Video Renderer”);
IFileSinkFilter sink;
IBaseFilter mux;
hr = capGraph.SetOutputFileName(new DirectShowNETCF.CGuid(CLSID_.MEDIATYPE_Video), “ChoiHOyeon.avi”, out mux, out sink);
//capGraph.RenderStream(new DirectShowNETCF.CGuid(CLSID_.VideoCapture), new DirectShowNETCF.CGuid(CLSID_.MEDIASUBTYPE_Asf), video, mpeg4, mux);
capGraph.RenderStream(new DirectShowNETCF.CGuid(CLSID_.PIN_CATEGORY_PREVIEW), new DirectShowNETCF.CGuid(CLSID_.MEDIATYPE_Video), video, mpeg4, renderer);
//Marshal.ReleaseComObject(mux);
//Marshal.ReleaseComObject(sink);
August 8th, 2009 at 4:52 pm
why do you try to connect encoder woth renderer?
did you start graph?
also to record video you have to use ControlStream method to start
August 8th, 2009 at 5:46 pm
one rederer is commentary.
did start graph and called ControlStream method.
but there is still a problem.
um..
.Net CF Directshow is difficult to find another example..
would you show another explame?
August 18th, 2009 at 5:03 am
Hi…
Thx for you source code and dll.
I have any question that how to save to files any video.
pls would show me how to use capGraph.SetOutFileName
capGraph.SetOutputFileName(new CGuid(CLSID_.MEDIASUBTYPE_Asf), “test.asf”, out mux, out sink);
Is that save to file? use only 1 line
September 28th, 2009 at 1:22 pm
Hi there, i want to save (still) image to disk how do i format the graph then ? it seems i need to use dmo with the windows video 9 encoder. are you willing to share the source code ? (or send it to me via email ?)
September 28th, 2009 at 1:31 pm
2Andre check next post… it explains how to still image (image, not video)
December 24th, 2009 at 1:42 pm
Not works for HTC HD2
December 24th, 2009 at 2:53 pm
doesnt work what? which exactly class?
March 5th, 2010 at 12:25 am
How do I save the captured video on the file system?
March 5th, 2010 at 8:33 am
connect source filter to encoder and encoder to file writer
March 6th, 2010 at 4:28 am
umm, can you please elaborate using code? thanks
March 6th, 2010 at 10:02 am
sorry i`m not going to do your work, you can read directshow documentation on msdn or read some directshow books
March 6th, 2010 at 10:49 am
OK, never mind. I just needed a few ideas to begin with the code.
Anyway, thanks for all your help
March 21st, 2010 at 12:52 pm
I can not display camera, because in function
private bool getVideoRenderer()
{object obj = null;
Guid clsid = CLSID_.VideoRenderer;
Guid riid = IID_.IBaseFilter;
DirectShowNETCF.PInvoke.PInvokes.CoCreateInstance(ref clsid, IntPtr.Zero, (uint)CLSCTX_.INPROC_SERVER, ref riid, out obj);
if (obj == null) { return false; }
……………..
}
I run steady return “obj == null” and to escape from function, so i not display camera.
I using Visual studio 2008, WM 6.
I very need your help.
April 3rd, 2010 at 10:39 pm
2nh,
probably you use incorrect video renderer GUID
April 8th, 2010 at 10:19 am
After capturing the video when I try to play it with PlayerControl, it always gets rotated by 90 degrees and then play. However, when I try to play in FullScreen, it plays without any rotation. Is there a way to avoid the 90 degree rotation in normal mode?
Thanks
April 8th, 2010 at 12:47 pm
have know idea how exactly you capture video and how exactly you set full screen mode so its difficult to help you.
P.S. use forum for questions
directshownetcf.com/forum
April 28th, 2010 at 3:47 pm
I’m having problems with the CGuid class, I can’t find it. where is it builded? and I can’t understand these “if (hr < 0)” conditions too (c# doesn’t recognize it, or i’m not in a right way)
April 28th, 2010 at 4:08 pm
I answered my second question, I read the code without decoding this: <, this is “<” caracter
April 28th, 2010 at 4:39 pm
CGuid - part of DirectShowNETCF, dont really remember where it exactly.
whats strange in hr < 0 ? hr < 0 means that function failed
April 28th, 2010 at 9:04 pm
Hi again, thanks for your answer. I’ve a new one. In the Init() method one of the lasts senteces is:
hr = capGraph.RenderStream(CGuid, CGuid, Object, IBaseFilter, IBaseFilter);
if I put this: (null, null, video, null, renderer) like the example, hr result is negative, and we need a positive value. I can’t continue from here.
Please, I need help again.
and thanks!
April 28th, 2010 at 9:27 pm
i have no idea what exactly you doing wrong… 1 line does not say anything…
try Camera class from DirectShowNETCF it can do everything that this example can and even more
April 29th, 2010 at 3:11 pm
Hi again! and thanks again!
if hr value is 0, is it ok? or the value has to be positive to work?
April 29th, 2010 at 4:16 pm
I’m getting this result for the next method:
-2147024809 = capGraph.RenderStream(null,null, video, null, renderer);
it fails, but i can’t understand why
April 29th, 2010 at 4:57 pm
2147467259, this is a COMException
April 29th, 2010 at 7:08 pm
2vito:
1) -2147024809 - this is error code… not exception? or you dont know what is exception?
2) 0 (zero) and positive result means succeed, please read MSDN it contains info regarding COM, DirectShow so on..
3) i dont know why it fails… there could me tons reasons… it could be your bug or could be hardware problem… as i wrote you earlier please Check Camera class that in DirectShowNETCF if it works correct, then this is definitely your bug.
April 30th, 2010 at 4:07 pm
Hi, I tried to deploy examples to HTC TyTn 2 but it didn’t work.
1. Camera example
- it producies unhandled exception in line
resolutionCombo.SelectedIndex = 0;
because the list resolutions stays emty; cam_.getMediaTypes() does not work properly I think
2. All other examples
- when I press Start button- cannot init camera is shown
I use VS2005 with windows mobile sdk - standard and professional (both)
Any help would be appreciated!
April 30th, 2010 at 6:14 pm
1. Have tryed to comment this line?
if resolutions stays empty then probably it cant find still pin or pin enumerator does not return anything… anyway seems like this is device problem, because all old HTC devices got far from perfect DirectShow drivers…
P.S. why do you need sdk for C# code?
May 6th, 2010 at 2:53 am
Hi - thanks for all your hard work and for sharing with everyone!
I am however having difficulty getting the Camera capture sample to run on two different phones - one running WM6 and one running WM6.5 as well as the emulator. I can’t init() the camera. Since you don’t release the source code to the libraries, I implemented the code from this page to see where it was failing, and when it gets to the RenderFile() call, I get a NotSupportedException in the CLR. It appears to be creating all the COM objects correctly, but for some reason when I call RenderFile() it throws the exception.
Any ideas?
May 6th, 2010 at 3:20 am
If it helps any, I get this in the Interop error log:
JIT ERROR FOR RCW COM METHOD:
(Managed -> Native):
DirectShowLib.ICaptureGraphBuilder2::RenderStream
I can’t seem to find much on this error though.
May 6th, 2010 at 3:35 am
Did some more experimenting - It looks like the culprits are the first two parameters. When I pass them as IntPtr the call works. Very odd - I don’t know why it’s working for everyone else as CGuids, but not for me…
So something is not marshaling correctly for the first two GUID parameters. Any ideas?
August 25th, 2010 at 6:25 pm
Hello
I want to use your code for streaming video from windows phone 5
but don’t know how I can use DEVMGR_DEVICE_INFORMATION
because my program can’t define it
how can i declare DEVMGR_DEVICE_INFORMATION in my program
also for Rect Class or Struct
Thank in Advance