So I've tried to tackle this problem for the last couple of weeks but come to a bit of a standstill. I'm trying to registering an RTSP stream from an IP address as a virtual webcam for use in another application (could be skype or similar). What I need is for my computer to add a virtual webcam to its device list. This should preferably be done through a C# script as devices could be added dynamically through a .NET program.
I have found similar questions on StackOverflow, but many of these are outdated, use Linux, or receives another stream format/protocol.
My approach so far has been using DirectShow filters and so far that has worked to a degree. Using Graphedit I can see my incoming stream by using an RTSP source filter. However, there are some problems:
The source filter was a trial, the full version is paid and pretty expensive
I have no experience with DirectShow filter programming
I only showed the stream through GraphEdit, there was no virtual driver registered so e.g Skype couldn't use the stream
So I guess my question boils down to:
Is my approach with DirectShow the only way to acheive what I'd like?
Is a filter the correct approach to use if Windows should list the stream as a webcam device?
Is vcam still the best example to look at to implement something like this?
Does any one know of similar, open source programs that acheive what I describe?
Anyway, I appreciate any help I can get!
Thanks.
The diagram below explains the applicability of virtual cameras:
You are trying to somehow mount a lower green or blue box so that it reads data from RTSP.
Note that more and more applications like new Skype are Media Foundation based (top right box on the diagram) and your filter based source is less and less applicable.
Creating a virtual camera which is recognized by various software assumes you are supplying a driver (red box). Even though such packages exist, I am not aware of any open source or even free which let you quickly start on this route.
DirectShow filter based sources (and you are yet to implement RTSP client there) will only be see by DirectShow based applications of the same bitness.
Related
I am writing an application for previewing, capturing and snapshotting camera input. To this end I am using Media Foundation for the input. One of the requirements is that this works with a Black Magic Intensive Pro 4K capture card, which behaves similar to a normal camera.
Media Foundation is unfortunately unable to create an IMFMediaSource object from this device. Some research lead me to believe that I could implement my own MediaSource.
Then I started looking at samples, and tried to unravel the documentation.
At that point I encountered some questions:
Does anyone know if what I am trying to do is possible?
A Windows example shows a basic implementation of a source, but uses IMFSensorProfile. What is a Sensor Profile, and what should I use it for? There is almost no documentation about this.
Can somebody explain how implementing a custom media source works in terms of: what actually happens on the inside? Am I simply creating my own format, or does it allow me to pull my own frames from the camera and process them myself? I tried following the msdn guide, but no luck so far.
Specifics:
Using WPF with C# but I can write C++ and use it in C#.
Rendering to screen uses Direct3D9.
The capture card specs can be found on their site (BlackMagic Intensity Pro 4K).
The specific problem that occurs is that I can acquire the IMFActivator for the device, but I am not able to activate it. On activation, an MF_E_INVALIDMEDIATYPE error occurs.
The IMFActivator can tell me that the device should output a UYVY format.
My last resort is using the DeckLinkAPI, but since I am working with several different types of cameras, I do not want to be stuck with another dependency.
Any pointers or help would be appreciated. Let me know if anything is unclear or needs more detail.
Most of touchpads on laptops don't handle multitouch, hence are not able to send swipe gestures to the OS.
Would it be possible to send some gestures to Windows from an external device, like a Teensy, or a recent Arduino, that can already emulate a keyboard and a mouse. I could send buttons 4 and 5 (mouse wheel up and down), but I would like to send a real swipe gesture (for example with a flex sensor...).
One of the ways that you could work with arduino and similar is to use the Microsoft .NET Microframework, which is an open source code, available for no cost from: Micro Framework
There are other frameworks available for the Artuino that you might want to use. So if you have a great idea on how to utilize the sensor hardware, then the output must meet certain specifications.
To be able to connect to your hardware that reads gestures, you will need to understand how drivers are created, so take a look at this: Info on drivers.
To find that type of information you would need to take a look at above link, this is for sensors, which would appear to be not quite what you are looking for, you are looking to use "gestures" but first you have to be able to make the connection to your device, this guide MIGHT help. I have reviewed it for other reasons.
There is a bunch of stuff to dig through, but first of all, imo, is to understand how to get your software to communicate with Windows 8. Let me know if you have any other questions. I am not the best person, you might want to refer to the community at the Micro Framework link shown above.
Good luck.
That's perfectly possible. What your effectively suggesting is that you want to create your own input peripheral like a trackpad and use that to send inputs. As long as windows recognizes this device as an input source it will work.
I have an usb-camera with its drivers and dll with some functions to use this camera in my solutions. I want to use it in any wide-spread applications, to be able just to choose and use it in Skype, for instance. So. I want to develop something that will allow me to use this device as usual web-camera.
I've heard something about such technologies as "Upper-Level Filter Drivers" and "user-mode DirectShow source filter". Looks like it something that can help.
So the question is: what technologies exist for such tasks? What technology should I choose to solve my problem if I have no skills of driver development?
Skype still uses DirectShow for video capture and user mode filter will do the job. Still Skype makes certain unreasonable assumptions that limit compatible source filters, such as if the developers stopped development/testing as soon as they had their favorite USB cam working and ignoring all other devices users might possibly want to attach.
One of the options you were suggested (in Russian - 1, 2) was to develop a kernel mode driver so that your device is visible to apps through standard WDM Video Capture Filter. This is possible and would work, though in my opinion it is a huge overkill.
Fitting custom source filter is not easy because Skype does not like a debugger attached, however driver development is really a completely different story.
The Skype Forum link you refer to is clearly misleading. The poster complains that Skype update broke compatibility with video sources. And response from admin is about audio devices, and is irrelevant.
I have developed a simple software using VB.net, now i want to receive some data from an external device, i want to know if any way to learn "**How to read a hardware transmitted data using VB.net, where hardware is attached to a USB port?**" Any specific book or any way to get this thing learn.
Looking forward to hear from you all.
Thanks & Regards.
I think you should not duplicate the question:-
Still i was searching and found the answer from the following link, so again posting it here so that people should not search more for this. Thabnks
How to get the data from a USB port in VB.NET
Here is what I found. You use the HID.dll to interface the usb ports. And you know the best part? I found some examples.
Here's a link that contains basic examples and tutorial for usb interfacing. The HID Page
Sample Project File
Simply I am asked to write an application for a smart device (smart cell phone), which will get the GPS coordinates from the device itself.
I have no smart device at all. And I am kind of lost among questions like how can I check if the device have a gps by using the code, if it has how can I obtain them in a "standard" way, do I need to be using frameworks like GeoFrameWork?
So, may somebody list the must or most required things I need to have ready?
Geoframeworks GPS.NET is free these days and it's pretty comprehensive so there's no point reinventing the wheel. It's also friendly to beginners which helps. I strongly recommend downloading it and playing with some of the sample apps. It's a bit tricky if you don't have a physical device to play around with but it does have GPS emulation classes that you can use.
All you need is a copy of VS2008 Pro with the Smart Device SDK installed.