i'm working with WebRTC.
In my peerconnection, i have added localdescription(offer) and remotedescription(answer).
but i can't see any ice generated.
RTCPeerConnection {localDescription: RTCSessionDescription, remoteDescription: RTCSessionDescription, signalingState: "have-local-offer", iceGatheringState: "new", iceConnectionState: "new", …}
They always stay in new state.
There are offer and answer inside.
Is anything i missed?
enter image description here
Have you added a track via addTrack or created a datachannel? Otherwise there is nothing to negotiate and your offer will not contain any mediasection (the thing that starts with m=)
Related
I want to edit the Microphone signal used by BigBlueButton conference and disable the Automatic Gain Control and Echo Cancelling.
However, I don't have information about the MediaStream instance used in the conference page. So, first issue is whether it is possible to find such active stream on the page? to later apply constraints to it. There is this question that says it is not possible to find active streams. But time has past and maybe options have changed. Plus, there might some other ways to get to this stream object.
Other than that, maybe there is a possibility to change the browsers' own flags for these AGC or AEC from a JS script or extension? (and not from the browser itself)
In a more specific detail of this issue: inside the BBB distribution I have looked for the js files ( sip.js and bbb_webrtc_bridge_sip.js) that use the getUserMedia method and I have edited them to give it the desired constraints, but to no avail. If someone knows about this specific platform I would like to ask for your help.
Note: In the mentioned page, there is an audio object that proves a srcObject which resolves to a MediaStream, I can access this and apply limited actions to it, but only in the echo test. Once past this test and inside the actual conference, access to this audio object has no effect.
Solution turned out to not access the MediaStream from a new JS script or extension but, in as in the specifics of the issue: from inside BigBlueButton JS files:
sip.js and bbb_wertc_bridge_sip.js files mentioned above belonged to the flash client, now out of use favouring the html5 client, so the right file to edit was:
/usr/share/meteor/bundle/programs/web.browser/app/compatibility/sip.js
and so what I did was to look for the instances of constraints or where the media stream is created, and inserted custom constraints and forced them in:
line 11941->. mediaHint = Object.keys(mediaHint || {}).length ? mediaHint : this.mediaHint;
replaced with-> mediaHint = this.mediaHint to force the entry into the following condition that creates a new stream with my own constraints in:
line 11956->
var constraints = mediaHint.constraints ||
(this.mediaHint && this.mediaHint.constraints) ||
{audio: true, video: true};
inserted my own constraints:
var constraints = {
audio: {
autoGainControl: false,
echoCancellation: false,
noiseSuppression: false,
},
video:false
};
This works and now these constraints disable AGC, AEC and NS.
On the new iOS 11 Safari and MacOS High Sierra Safari, that trick of seeing if window.localStorage.setItem('test', 1); (see https://stackoverflow.com/a/17741714/1330341) throws an error no longer works, because it no longer throws an error, and it also properly sets the localStorage item. Has anyone figured out any other way to check for private browsing mode in the new versions of Safari?
Haven't actually tried it, but from reading Apple's document:
https://support.apple.com/kb/ph21413?locale=en_US
It lists various characteristics of private mode browsing (~snip):
When you use a Private Browsing window:
Each tab in the window is isolated from the others, so websites you
view in one tab can’t track your browsing in other tabs.
Safari doesn’t remember the webpages you visit or your AutoFill
information.
Safari doesn’t store your open webpages in iCloud, so they aren’t
shown when you view all your open tabs from other devices.
Your recent searches aren’t included in the results list when you use
the Smart Search field.
Items you download aren’t included in the downloads list. (The items
do remain on your computer.)
If you use Handoff, Private Browsing windows are not passed to your
iOS devices or other Mac computers.
Safari doesn’t remember changes to your cookies or other website
data. Safari also asks websites and others who provide those sites
with content (including advertisers) not to keep track of your
browsing, although it is up to the websites to honor this request.
Plug-ins that support Private Browsing stop storing cookies and other
tracking information.
From the above, in particular I found interesting that Safari specifically asks websites to "not track" the browsing. This could potentially be a mechanism to look for, to determine if using private browsing.
See this answer for an example:
Implementing Do not track in asp.net mvc
Again, haven't tested and unsure if it will work, but if not the list provides other potential options. HTH.
I find a solution here:
https://gist.github.com/cou929/7973956#gistcomment-2272103
var isPrivate = false;
try {
window.openDatabase(null, null, null, null);
} catch (_) {
isPrivate = true;
}
alert((isPrivate ? 'You\'re' : 'You aren\'t') + ' in private browsing mode');
Hope it helps :)
Quote from apple's website. https://support.apple.com/kb/ph21413?locale=en_US
Websites can’t modify information stored on your device, so services
normally available at such sites may work differently until you turn
off Private Browsing
So, store a test variable, change its value, then read the test variable.
If you get an exception, are unable to find the variable, the value didn't change or you get a null/undefined value back, they are most likely in private mode.
Alternatively, in private browsing, you have no stored search history accessible. So, redirect to a new page in your site on startup and then test if you have any previous history. If not and the fact that you are getting a Do Not Track most likely means your in private mode on safari.
Please note that I have not tested this. This is based off the information provided by Apple in the above link.
Thing that I realized is Safari throws a "Quota Exceeded" error in the Private mode. So here is what I did!
isPrivateMode: function () {
if (localStorage.length === 0) {
try {
localStorage.setItem('isLocalStorageAvaialble', 'That is being tested!');
localStorage.removeItem('isLocalStorageAvaialble');
return false;
} catch (e) {
return true;
}
}
}
Checking the length of localStorage is important for the fact that, if you are trying this method on a browser that supports localStorage, but is full, you still will get the "Quota Exceeded" error.
In private mode, the length of localStorage is always 0.
Hope this helps!
I have an NSMenu that I want to update with items pushed to my app through pusherapp and received using the libPusher client library. But events seem not to be received in NSEventTrackingRunLoopMode.
Given the following snippet:
[channel bindToEventNamed:#"my_event" handleWithBlock:^(PTPusherEvent *event) {
NSLog(#"event received");
}];
And I wait for a push to occur while I maintain the menu open, I expect to receive the event immediately but I only receive it when I close the menu.
I also tried passing the main queue to bindToEventNamed:handleWithBlock:queue: (using dispatch_get_main_queue();), to no avail.
So I'm left wondering whether I'm doing something wrong or there's a bug in libPusher?
I'm the author of libPusher. The reason you are seeing this problem is because the underlying WebSocket library used by libPusher, SocketRocket only works in the default run loop mode.
The good news is that this has been fixed in the latest HEAD of SocketRocket. I have tested libPusher agains the latest SocketRocket and can confirm that it fixes this issue and I intend to roll these changes in to the next release.
Now, I've just checked the outstanding Github issue and realised that you were the original reporter of this bug, so you probably know all this already but I'm going to post this answer anyway for posterity.
libPusher issue
SocketRocket issue
I have console applicaiotn that currently uses CAsyncSocket.
I need to implement SSL so after some searching I found this project: http://www.codeproject.com/Articles/3915/CAsyncSslSocketLayer-SSL-layer-class-for-CAsyncSoc
For some reason same simple code that works fine on GUI code does not work in console app.
Has anyone exp. with CAsyncSslSocketLayer ?
Thanks.
CAsyncSocketEx uses a window as a sort of cheap thread to handle the event notifications that come from select(). Unfortunately, if you don't have a message loop, then the window which it creates will not receive these events.
http://support.microsoft.com/kb/90975
This article explains that a call to CreateWindow() needs to be called from a thread which has a message loop. And if you don't, then anything sent via PostMessage() won't get there.
I've recently started to tinker with this -- I want to remove the annoying hidden window and replace it with a normal thread. Their code relies on WSAAsyncSelect() in order to receive socket events... to a window. Yuk!
It's been a while since I had the same problem, but if I remember correctly, to use CAsyncSocket in a console app you need to add something like DECLARE_CONSOLEAPP (first two links shown below) to your console app. This should give your console a message pump to generate the socket notifications (OnReceive, etc.) GUI apps have these pumps but console apps don't, generally. The third (msdn) link below might also apply, it has more info and a different way.
If these still don't work, you should put breakpoints in your socket code and make sure your socket isn't instantiated in a thread or callback other than the main console app (the one that now has the message pump).
I think googling around for 'CAsyncSocket WinApp' or 'CAsyncSocket console app' would show more.
http://www.codeguru.com/cpp/misc/misc/consoleapps/article.php/c243/Console-app-using-MFC.htm
http://troels.knakkergaard.dk/code.htm
http://social.msdn.microsoft.com/forums/en-US/vcgeneral/thread/a6f1b72a-21d8-4046-a3dc-d7d29ece2ef6
It is quite tricky because I wanna to take the result as a sign for later process. If a window flashes, it would be weird to user.
(This is not an answer, just refreshing the question and adding some details:)
Suppose you need to open a video capture driver (webcam) with code like this (delphi, but easy understandable):
result:= SendMessage(hCapWnd, WM_CAP_DRIVER_CONNECT, FDriverNo, 0);
It works fine, except when camera/webcam is busy (opened by another application, for example moviemaker). Then the capture driver suddenly shows a "select video source" window that blocks your application (but not moviemaker, which keeps recording). SendMessage function becomes modal and will not return until undesired window is closed.
Is there a way to detect if a capture driver is busy with another application before connecting to it?
Thanks
This function return number of available webcams and scanners on your mashine(с++).
int GetNumCam()
{
int MemberIndex = 0;
HDEVINFO dev;
SP_DEVINFO_DATA DeviceInfoData;
DeviceInfoData.cbSize = sizeof(DeviceInfoData);
dev = SetupDiGetClassDevsA(&GUID_DEVINTERFACE_IMAGE, NULL,NULL,DIGCF_PRESENT);
if (dev == NULL)
{
MessageBoxA(0,"it is null..","vse propalo",0);
return -1;
}
else
{
while(SetupDiEnumDeviceInfo(dev,MemberIndex, &DeviceInfoData))
{
MemberIndex++;
}
}
return MemberIndex;
}
I wonder if sending a broadcast message could do. I mean, suppose you send a VFW info request message to all windows in system. Then, all windows actually doing VFW processing will answer their status info and you will know which of them are doing video processing; some kind of shouting "anybody here...?"
But it looks like brute force, or even hacking. May be I'll test it... may be not. I am sure there must be a smarter way to know if a video capture driver is busy with another application.
(btw... anybody here?)
I was afraid it would happen.
First I enumerated all opened windows in system, then executed this instruction for each HWND, which just asks for driver information (pascal syntax):
SendMessage(h, WM_CAP_DRIVER_GET_NAME, length(driver)*sizeof(char), LPARAM(PChar(driver))
According to Msdn help, WM_CAP_DRIVER_GET_NAME results are:
"Returns TRUE if successful or FALSE if the capture window is not connected to a capture driver"
(Bold is mine). So it appears a good way to know:
1-If the window is capturing. So it is applyable to ALL windows, don't matter if they are capturing or not.
2-And if so, it tells you which driver is using.
However, after first test round, the results were:
- Task Manager (it was running) crashed and closed
- Explorer crashed and closed (reopened again automatically)
- Belkin Wireless monitor (my pc's WiFi driver) crashed and closed
- Eset Nod32 antivirus crashed, did not closed
The first conclussion can be that this is a bad way to locate which applications are capturing video in a system. But I must ensure to dismiss the possibility of a bug.
I'll keep reporting.
This is not a good solution my any means but I found out that if you disable and enable the camera in device manager immediately before sending the WM_CAP_DRIVER_CONNECT message then for some reason the video source window does not appear and the function returns and works OK.
So for a script I was working on I had to download devcon.exe and I put "devcon disable *PID_3450*MI_00*" and "devcon enable *PID_3450*MI_00*" immediately before my WM_CAP_DRIVER_CONNECT and it seems to work consistently. Unfortunately you need to run as administrator to be able to disable/enable devices. Again not a proper fix by any means...
(Hardware ID of my cam is USB\VID_0AC8&PID_3450&MI_00)