Dynamically Set number of targets

By vinny82 on Fri, 03/29/2013 - 20:55

Hi,

I can see that in VideoPlayback sample , In VideoPlayBack.Java and VideoPlayBack.Cpp number of ragets are given static.

Suppose i am loading tagets for server and after loading of content i come to know number of ImageTargets. I can modify it VideoPlayBack.java

but I am facing issues in VideoPlayBack.cpp.

Please suggest a solution.

Regards

Vineet Aggarwal

Hi,

you could pass the number of targets from Java to C++ via a native method,

then in C++ you could use an std::vector instead of a simple array to dynamically create and fill the list of targets.

Dynamically Set number of targets

Hi,

I tried to use std: vector but nd build gives me following error : fatal:error: vector: No such file or directory

Included

#include <vector> in VideoPlayback.cpp

Application.mk

Dynamically Set number of targets

Hi,

have you tried using APP_STL:=stlport_shared

instead of stlport_static

Dynamically Set number of targets

Hi It's working now ,

The STL issues seems to be solved.

Do I have to dynamically allocate all these dynamically

MEDIA_STATE currentStatus[NUM_TARGETS];

QCAR::Vec2F targetPositiveDimensions[NUM_TARGETS];

Dynamically Set number of targets

Hi, glad that it is solved.

Concerning your question:

Dynamically Set number of targets

Hi Alessendro,

Thanks

I have started using std:vector . I changed the arrays to vectors . I got targets from my java code in initTracking Method. But i 'm facing issue in initialization of targetPositiveDimensions.

1. Please let me know my approch is correct

Dynamically Set number of targets

Hi,

it seems this code is causing that error:

targetPositiveDimensions[0].data = 0.0;
targetPositiveDimensions[1].data = 0.0;

Replace 0.0 with 0.0f and it should be OK.

Dynamically Set number of targets

Hi Alessandro

Thanks

The error now changes to

incompatible types in assignment of 'float' to 'float [2]'

Dynamically Set number of targets

Hi, sorry, there is also another error in your code, which I only saw now, so this is the correct code:

Dynamically Set number of targets

Hi Alessandro,

Love You. Thanks now issue solved.

Dynamically Set number of targets

I see. If you declare the targetPositiveDimensions that way:

Dynamically Set number of targets

Thanks Alessandro

It works.

Dynamically Set number of targets

Great! Glad to help.

Dynamically Set number of targets

Hi Alessandro.

I think i am close in achieving my objective of getting dynamic targets.

1. Please check my initTacker method

Dynamically Set number of targets

Hi, how many targets are you trying to use ?

Dynamically Set number of targets

Hi ,

I am getting targets xml from resource and targets can increase or decrease at run time. Therefore i need to have dynamic targets. I am passing the no. of targets getting from server in initTracker method via java code.

Dynamically Set number of targets

Yes, I understand that, but I am wondering how many targets you have at most (max), for instance 5, or rather 10, or more like 20 ?

I ask that because laoding/playing videos can be resource consuming and can lead to crash your app if you have too many videos.

Dynamically Set number of targets

Hi , The maximum no. of videos can be 4.

We are planning to have 8-10 targets.

The no. of videos will be 4 and rest will be 2d Images.

Dynamically Set number of targets

Hi, if you plan to have 8 - 10 videos, you will probably need to load and unload videos (for example, unload a video when you don't need to play it), because otherwise you have good chances to ru out of resources and get a crash;