Plugin for a LWIR SmartIR640 sensor

[m.lenz]

Hey,

I started using GStreamer for a new application with an LWIR sensor. The
camera device is a SmartIR640 from ALab running on a Linux based operating
system on a Jetson TX2.

I want to use a Gstreamer pipeline to grab the video data and process them.
From ALab I got the shared object library and the header files for the
camera.

In a first step I used Pipeline Manipulation of an appsrc element to get the
data into the pipeline. This works just fine.

To become more flexible with the pipeline I want to create a plugin which
first connects to the camera and then puts the video data into the pipeline,
so that I can use GStreamer as a command line tool.

Therefore I used the gst_element_maker with the GstBaseSrc template to
create my smartir640src plugin. Then I used _start() to open the device and
_fill() where I put all the data into the buffer. Don’t know if this is the
right procedure.

But I don’t how to test this new plugin. I already read all the “Plugin
Writers Guide” information. I have the files gstsmartir640src.c / .h and the
.so / .h files from the camera sensor. What I have to do now so that
gst-inspect will find this new plugin? I can not find any information to
this.

Thanks a lot




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[Nicolas Dufresne-5]

Le sam. 11 janv. 2020 08 h 15, m.lenz <[hidden email]> a écrit :

Hey,

I started using GStreamer for a new application with an LWIR sensor. The
camera device is a SmartIR640 from ALab running on a Linux based operating
system on a Jetson TX2.

I want to use a Gstreamer pipeline to grab the video data and process them.
From ALab I got the shared object library and the header files for the
camera.

In a first step I used Pipeline Manipulation of an appsrc element to get the
data into the pipeline. This works just fine.

To become more flexible with the pipeline I want to create a plugin which
first connects to the camera and then puts the video data into the pipeline,
so that I can use GStreamer as a command line tool.

Therefore I used the gst_element_maker with the GstBaseSrc template to
create my smartir640src plugin. Then I used _start() to open the device and
_fill() where I put all the data into the buffer. Don’t know if this is the
right procedure.

But I don’t how to test this new plugin. I already read all the “Plugin
Writers Guide” information. I have the files gstsmartir640src.c / .h and the
.so / .h files from the camera sensor. What I have to do now so that
gst-inspect will find this new plugin? I can not find any information to
this.

You can export GST_PLUGIN_PATH=/plugin/dir

With the right directory were you have built your plugin.

Thanks a lot




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[m.lenz]

I already tried to export GST_PLUGINS_PATH. But inside this directory there
are only the pre-generated files with my modifications in the C-Code. The
gst-inspect does not find any new plugin with the environment variable
pointing to this directory. So what is really the job of GST_PLUGINS_PATH
and at which point gstreamer is using this variable?

I think before using any new plugin, gstreamer has to build is. So, how and
at which time the new plugin will be compiled? At this moment I have only
created the source code but I can not find any information about how to go
on with this.



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[Nicolas Dufresne-5]

Le mer. 15 janv. 2020 05 h 15, m.lenz <[hidden email]> a écrit :

I already tried to export GST_PLUGINS_PATH. But inside this directory there

Memory failure here, but I thought there was no S to PLUGIN (check the gst-launch-1.0 man page to confirm).

are only the pre-generated files with my modifications in the C-Code. The
gst-inspect does not find any new plugin with the environment variable
pointing to this directory. So what is really the job of GST_PLUGINS_PATH
and at which point gstreamer is using this variable?

I think before using any new plugin, gstreamer has to build is. So, how and
at which time the new plugin will be compiled? At this moment I have only
created the source code but I can not find any information about how to go
on with this.

Oh, so haven't build this. Of course C is a compile language. What do you know about this process ? Is that plugin code Open Source ?

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