Re: WPF - Hacked! Part I

Man, I really hope I can spend a little more time with you on this WPF stuff. It is so interesting and the stuff you have already developed is just so far ahead of the curve right now. Keep up the great work. -- Oh, and I just wanted to be the first comment on your blog :)

Re: WPF - Hackery! Part I

amazing work - the dog is barkin

Re: WPF - Hackery! Part I

You're genius! :)

Re: WPF - Hackery! Part I

This is great, I've downloaded the demo project and run it, but the callback never gets called, on either xp or vista, any ideas at what could be going wrong.

Re: WPF - Hackery! Part I

this is great stuff, I have downloaded the demo but for some reason the callback never gets called, I have tried on xp and vista but still no go, any ideas as to what could be going wrong

Re: WPF - Hackery! Part I

Run "regsvr32 MediaBridgeSourceFilter.ax" on a release build. That filter must be registered to work.

Re: WPF - Hackery! Part I

Hi Jeremiah!

Great job! I have one little question though. I can somehow compile your sample, and it runs fine, at least release configuration of it. If I put your code into new projects, and then run it, it runs fine, but upon exit I am gettng exception 0x8000003 (The exception Breakpoint. A breakpoint has been reached.) I am running debug configuration, and am getting this exception on exit both in IDE and in command line runs. Do you have any idea what could it be?

Thanks.

Re: WPF - Hackery! Part I

Update: managed to recompile your code in debug mode. Guess what!? Same exception. It seems to be somehow related to incomplete release of COM objects (guess in the graph), but I was not yet able to figure out what is causing it.

Re: WPF - Hackery! Part I

I had a similar issue, but only when I compiled the media bridge filter in debug mode. After I built it in release mode, all the problems went away. I haven't had time to figure out what the problem was...probably the debug libs that are being used or the debug build configuration.

Re: WPF - Hackery! Part I

This is an amazing pice of reverse engineering. Cudos from here. I have a question though. Do you know if it posible to load a previous generated graph file (*.grf) and the use the enhaced video render to render the video in such a graph? In a project I have today I use the DirectShowLib.Utils.FilterGraphTools.LoadGraphFile(IGraphBuilder,path) to build my graph. I can't render to the EVR after i've added it with GraphBuilder.AddFilter(renderer, "Enhanced Video Renderer"). I get a error as follows:
Context 0x1a1b50' is disconnected. Releasing the interfaces from the current context (context 0x1a17b8).This may cause corruption or data loss. To avoid this problem, please ensure that all contexts/apartments stay alive until the applicationis completely done with the RuntimeCallableWrappers that represent COM components that liveinside them.

My graphs must get rendered since I hear the sound(it is rendering a TV caputure card). Perhaps you have some input?

Re: WPF - Hackery! Part I

The MediaElement already create and adds the EVR to the graph. You simply just have to render your video pins to the input pin of the EVR. I do not suggest ever using *.grf files, as these are really made for debugging purposes. For your solution, just get the tv tuner filter, add it to the graph and render the output pin of the tv tuner filter and DShow should connect it to the input of the EVR.

Re: WPF - Hackery! Part I

would this work with more than one mediaelement at the same time? I have a multiple monitor setup with each display having a different window playing its own mediaelement (simultaneous). the thing is I need to direct the sound of each mediaelement to a specific USB sound card. would both mediaelements use the same EVR? if not, how would I get a seperate reference to each individual graph?

Re: WPF - Hackery! Part I

would this work with more than one mediaelement at the same time? I have a multiple monitor setup with each display having a different window playing its own mediaelement (simultaneous). the thing is I need to direct the sound of each mediaelement to a specific USB sound card. would both mediaelements use the same EVR? if not, how would I get a seperate reference to each individual graph?

Re: WPF - Hackery! Part I

would this work with more than one mediaelement at the same time? I have a multiple monitor setup with each display having a different window playing its own mediaelement (simultaneous). the thing is I need to direct the sound of each mediaelement to a specific USB sound card. would both mediaelements use the same EVR? if not, how would I get a seperate reference to each individual graph?

Re: WPF - Hackery! Part I

would this work with more than one mediaelement at the same time? I have a multiple monitor setup with each display having a different window playing its own mediaelement (simultaneous). the thing is I need to direct the sound of each mediaelement to a specific USB sound card. would both mediaelements use the same EVR? if not, how would I get a seperate reference to each individual graph?

Re: WPF - Hackery! Part I

would this work with more than one mediaelement at the same time? I have a multiple monitor setup with each display having a different window playing its own mediaelement (simultaneous). the thing is I need to direct the sound of each mediaelement to a specific USB sound card. would both mediaelements use the same EVR? if not, how would I get a seperate reference to each individual graph?

Re: WPF - Hackery! Part I

would this work with more than one mediaelement at the same time? I have a multiple monitor setup with each display having a different window playing its own mediaelement (simultaneous). the thing is I need to direct the sound of each mediaelement to a specific USB sound card. would both mediaelements use the same EVR? if not, how would I get a seperate reference to each individual graph?

grf in mediaelement

I managed to render my custom graph programmaticaly, I guess I'll have to do it that way insted off using a .grf file as basis. Thanks for you input

Re: WPF - Hackery! Part I

Hi Jeremiah, this is an very nice improvement but there is one important handicap. If you have not any active internet connection the windows media player by default can not open any url (error code: 0xC00D10B3). Otherwise this works fine.

error code: 0xC00D10B3

>> Hi Jeremiah, this is an very nice improvement but there is one important handicap. If you have not any active internet connection the windows media player by default can not open any url (error code: 0xC00D10B3). Otherwise this works fine.
-----------------------------------

Solve this with following setting:
HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences

Change ForceOnline to 0x1.

Re: WPF - Hackery! Part I

Wow, good find dan! Thanks for the fix. Maybe I'll add it to the register code of the filter.

-Jer

Re: WPF - Hackery! Part I

I'm trying the demo and it works well except that when I close the app, the webcam is still on. I made a stop button that calls BridgedElement.Stop() and MediaBridgeManager.UnregisterCallback(...) but that doesn't do the trick. Any ideas on how I could fix this?

Re: WPF - Hackery! Part I

Hi Jeremiah

As I've said before, I love what you've done here. I do have a question about clean up really. I've been working with the bridge to work with video files rather than the live source. I get MDA's thrown when I go to load new file. This doesn't appear to affect the app when run out of the debugger and memory use does not continually increase. Just wondering if you've got some guidelines in this respect.

Re: WPF - Hackery! Part I

Hi Jeremiah

As I've said before, I love what you've done here. I do have a question about clean up really. I've been working with the bridge to work with video files rather than the live source. I get MDA's thrown when I go to load new file. This doesn't appear to affect the app when run out of the debugger and memory use does not continually increase. Just wondering if you've got some guidelines in this respect.

Re: WPF - Hackery! Part I

Hi Jeremiah

As I've said before, I love what you've done here. I do have a question about clean up really. I've been working with the bridge to work with video files rather than the live source. I get MDA's thrown when I go to load new file. This doesn't appear to affect the app when run out of the debugger and memory use does not continually increase. Just wondering if you've got some guidelines in this respect.

The 'holy-grail'

>>>>>The 'holy-grail' would be to figure out how to get low-level, high-performance access to a bitmap in WPF and to be able to make our own video players, out side of Microsoft's MediaElement sandbox. I hope to get you guys a little excited, because I found out HOW! I'll post full source when it's cleaned up a little<<<<<

That would be great!!!
Did you have the chance to clean up the code and post it somewhere?

Re: WPF - Hackery! Part I

Hi Jeremiah! I living in Ukraine. Sorry in my bad INGLISH :-).
I make video control in Expression Blend on basis of your example.
Control run automatically.
Cоde XAML:
___________________________
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="UntitledProject2.UserControl1"
x:Name="UserControl"
Width="320" Height="240">




_____________________________
Code C#:
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using MediaBridge;
using DirectShowLib;
using System.Runtime.InteropServices.ComTypes;
using System.Runtime.InteropServices;

namespace UntitledProject2
{
public partial class UserControl1

{
IBaseFilter filter;
IFilterGraph graph;
IGraphBuilder graphBuilder;
ICaptureGraphBuilder2 captureGB;


public UserControl1()
{
this.InitializeComponent();

//// Insert code required on object creation below this point.
//btnStart.Click += new RoutedEventHandler(btnStart_Click);
//}
// void btnStart_Click(object sender, RoutedEventArgs e)
//{
string url = "MediaBridge://MyDataString";

MediaBridge.MediaBridgeManager.RegisterCallback(url, BridgeCallback);

BridgedElement.Source = new Uri(url);

BridgedElement.Play();
}
private void BridgeCallback(MediaBridgeGraphInfo GraphInfo)
{
int hr = 0;

//Find a capture filter
filter = FindCaptureDevice();

//Convert pointer of filter graph to an object we can use
graph = (IFilterGraph)Marshal.GetObjectForIUnknown(GraphInfo.FilterGraph);

graphBuilder = (IGraphBuilder)graph;

captureGB = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();

hr = captureGB.SetFiltergraph(graphBuilder);

//Add our capture filter to the graph
hr = graph.AddFilter(filter, "CAPTURE");

IBaseFilter renderer;

//Find WPF renderer. It's always named the same thing
hr = graphBuilder.FindFilterByName("Enhanced Video Renderer", out renderer);
//hr = graphBuilder.FindFilterByName("Video Mixing Renderer (VR)", out renderer);

//Render our filters outpin to the renderer
hr = captureGB.RenderStream(PinCategory.Capture, MediaType.Video, filter, null, renderer);

DsROTEntry entry = new DsROTEntry(graph);
}
public IBaseFilter FindCaptureDevice()
{
int hr = 0;

IEnumMoniker classEnum = null;
IMoniker[] moniker = new IMoniker[1];

object source = null;

// Create the system device enumerator
ICreateDevEnum devEnum = (ICreateDevEnum) new CreateDevEnum();

// Create an enumerator for the video capture devices
hr = devEnum.CreateClassEnumerator(FilterCategory.VideoInputDevice, out classEnum, 0);
DsError.ThrowExceptionForHR(hr);

// The device enumerator is no more needed
Marshal.ReleaseComObject(devEnum);

// If there are no enumerators for the requested type, then
// CreateClassEnumerator will succeed, but classEnum will be NULL.
if (classEnum == null)
{
throw new ApplicationException("No video capture device was detected.\r\n\r\n" +
"This sample requires a video capture device, such as a USB WebCam,\r\n" +
"to be installed and working properly. The sample will now close.");
}

// Use the first video capture device on the device list.
// Note that if the Next() call succeeds but there are no monikers,
// it will return 1 (S_FALSE) (which is not a failure). Therefore, we
// check that the return code is 0 (S_OK).

if (classEnum.Next (moniker.Length, moniker, IntPtr.Zero) == 0)
{
// Bind Moniker to a filter object
Guid iid = typeof(IBaseFilter).GUID;
moniker[0].BindToObject(null, null, ref iid, out source);
}
else
{
throw new ApplicationException("Unable to access video capture device!");
}

// Release COM objects
Marshal.ReleaseComObject(moniker[0]);
Marshal.ReleaseComObject(classEnum);

// An exception is thrown if cast fail
return (IBaseFilter) source;

}
}
}
_______________________________
WEB camera working excellent!!!!
I`m want use TV-tuner. How did do it????????????????
I`m novice in programming.
Help me code! Please! Already "roof depart" :-)

Re: WPF - Hackery! Part I

XAML code :
___________________________________________________________________
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="UntitledProject2.UserControl1"
x:Name="UserControl"
Width="320" Height="240">







_____________________________________

Re: WPF - Hackery! Part I

Hello Andrey,

Feel free to email me, jeremiah.morrill[ at ]gmail.com and I think I can give you some pointers on how to do a TV Tuner.

-Jer

Re: WPF - Hackery! Part I

On the way to get this running I had problems that the MediaBridgeSourceFilter.ax did not load.

LDR: LdrRelocateImageWithBias() failed 0xc0000018
LDR: OldBase : 10000000
LDR: NewBase : 019F0000
LDR: Diff : 0x7c91dec202aee404
LDR: NextOffset : 00000000
LDR: *NextOffset : 0x0
LDR: SizeOfBlock : 0x19f0000

Then I removed the compiler switch /FORCE and the filter (.ax) could be loaded. I hope that switch change has no other implications !?