New program gmeasure, need some help - maemo.org

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dov	2011-04-29 , 10:32
Posts: 81 \| Thanked: 45 times \| Joined on Dec 2009	#1

Hi all,

I have written a new application gmeasure that allows measuring distances in photographs. It is available in source from:

https://github.com/dov/gmeasure

I would very much appreciate with help on the following issues:

* Creation of infrastructure for a debian package.
* An icon.
* Currently the package compiles with scons, but perhaps it would make sense to translate it into autoconf.
* How do I programitically take an image snapshot, i.e. show a live video of the camera, and then snap it when the camera button is pressed?

Any other comments are welcome!
Thanks!

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	nicolai	2011-04-29 , 11:13
	Posts: 1,637 \| Thanked: 4,424 times \| Joined on Apr 2009 @ Germany	#2

Originally Posted by dov

* How do I programitically take an image snapshot, i.e. show a live video of the camera, and then snap it when the camera button is pressed?

gstreamer + camerabin
or gdigicam if you need a higher level api.

Here is some python code which uses gstreamer and camerabin.
It should be easy t o translate this to c:

PHP Code:


			


import gst

bin = gst.element_factory_make("camerabin")

bin.set_property("videoenc", gst.element_factory_make("dspmp4venc"))

bin.set_property("videomux", gst.element_factory_make("hantromp4mux"))

bin.set_property("audioenc", gst.element_factory_make("nokiaaacenc"))

bin.set_state(gst.STATE_PLAYING)

bin.set_property("filename", "test.mp4")

bin.set_property("mode",1)

#starts recording

bin.emit("user-start")



# wait some time



# stops recording

bin.emit("user-stop")

bin.set_state(gst.STATE_PAUSED)

bin.set_state(gst.STATE_NULL)

(this takes a video not an image but the overall workflow
is the same)

Using the camera button is difficult. If you have the stock camera-ui,
everytime you push the camerabutton and the lenscover
is open, it will launch the stock camera-ui.
Better use a GUI-button in your UI

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The Following User Says Thank You to nicolai For This Useful Post:
dov

dov	2011-05-01 , 20:44
Posts: 81 \| Thanked: 45 times \| Joined on Dec 2009	#3

Thanks again for your help, Nicolai.

I did some progress with camerabin, but then I got stuck. Here is what happened:

1. On the desktop I can view video from the videotest and I can save it in a file by doing:

PHP Code:


			
g_object_set(camerabin,"filename","foo.jpg",NULL);

g_signal_emit_by_name(camerabin, "capture-start");

2. On the N900 I see the livevideo when I use the default video-source. But "capture-start" does not work. No image is recorded. Why? How can I debug this?

Another related question, is it possible to focus the camera through camerabin, or does that require gdigicam?

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	nicolai	2011-05-01 , 21:36
	Posts: 1,637 \| Thanked: 4,424 times \| Joined on Apr 2009 @ Germany	#4

"user-start" not "capture-start" even for capturing.
This is what gdigicam-camerabin does:

Code:

g_object_set (bin, "filename", helper->file_path, NULL);
TSTAMP (before-gst-capture);
g_signal_emit_by_name (bin, "user-start", 0);
g_signal_emit_by_name (bin, "user-stop", 0);

Nicolai

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dov	2011-05-02 , 05:32
Posts: 81 \| Thanked: 45 times \| Joined on Dec 2009	#5

Thanks! I'll test that tonight.

Regarding focusing, do you know how to focus the camera?

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