Getting Widget camera

[GoogleCodeExporter]

Hello,

I'm using linuxtrack interface: linuxtrack_hello_word.c and trying to create a 
Qwidget (with QTCreator) where i put the camera view while tracking but i can't 
do that because linuxtrack_hello_word is using "camera device" so i have no 
access to it. Is there any function or idea to get the camera view where 
tracking?

Thank you for your help
Best regards

Original issue reported on code.google.com by chaaboun...@gmail.com on 28 Jan 2015 at 10:18

[GoogleCodeExporter]

Hello,

for the moment there is no interface allowing client applications to access the 
camera data. The thing is - this information is primarily used only for 
debugging of the tracking problems via Ltr_gui, while the client application is 
supposed to only consume the tracking data (mainly pose, ...).

As far as other applications of the similar kind (TrackIR software, FreeTrack, 
Facetrack NOIR, ...) are concerned, as far as I know, none of them provides 
such functionality.

May I ask you why you'd need the camera view in the client application?

Kind regards,

Michal

Original comment by f.jo...@email.cz on 29 Jan 2015 at 6:23

[GoogleCodeExporter]

Hello,

I'm a computer science student and i need to reflect the camera view while 
tracking in my widget. I've tried to read the code and find what exactly do 
that but it was not very commented so it's difficult. If you can help me this 
will be amazing and i will be so grateful :)

Kind regards,

Nadia

Original comment by chaaboun...@gmail.com on 29 Jan 2015 at 3:26

[GoogleCodeExporter]

Hello Nadia,

I can try to add a possibility to put the frame into a memory mapped file. That 
said, there will probably be a problem to synchronize the the thing to avoid 
tearing...

I'll try to think about it.

Kind regards,

Michal

PS. I know the code is not very well commented, and it is quite convoluted in 
several places; I'm going to do a clean-up pass when I get 1.0 out of the 
door...

Original comment by f.jo...@email.cz on 30 Jan 2015 at 12:57

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

Hi, 

OK thanks Michal. This will be great :)

Kind regards,
Nadia

Original comment by chaaboun...@gmail.com on 30 Jan 2015 at 3:25

[GoogleCodeExporter]

Hello Nadia,

I just committed the first attempt of providing frame capture to client 
applications (branches/cam_view).

Linuxtrack interface contains two new functions - linuxtrack_request frames, 
which requests frames to be passed along, and linuxtrack_get_frame, which 
provides the frame (if available).

To have the buffer of the right size for linuxtrack_get_frame, you can use 
linuxtrack_get_pose_full, or you can just alloc a buffer of arbitrary size, and 
if it is not big enough, linuxtrack_get_frame returns 0 and in req_* values 
there will be current frame size (just realloc the buffer accordingly).

I can put you together a testing package, if you let me know which system to 
target (linux 32bit, linux 64bit, Mac)...

Kind regards,

Michal 

Original comment by f.jo...@email.cz on 8 Feb 2015 at 2:03

• Changed state: Started

[GoogleCodeExporter]

Hello,

the code is now back in the trunk; I'll try to produce some testing build over 
the weekend. The changes contain both possibility to receive captured data and 
notification on incoming frame. Details are in the ltr_gui help article on 
Linuxtrack interface.

Kind regards,

Michal

Original comment by f.jo...@email.cz on 19 Feb 2015 at 6:21