Using Qualcomm's camera subsystem on VOXL2

Chad Sweet

Can you please be more specific about the package you are trying to use? Of course our voxl-camera-server is built on top of the Qualcomm camera framework.

AnthoJack

Oh so the qualcomm's camera server is installed already (couldn't find it mentioned anywhere). Then more specifically I'd like to use the qmmfsrc gstreamer element to recover images directly from it instead of going through your camera server but couldn't find how and where to retrieve the plugin

modaltb

We aren't supporting gst* stuff necessarily as our focus is via our camera-server as an attempt make general development on top of the QC stack easier over time. That said it is how I tested cameras initially and the framework is there and "works" as far as my use cases went, but it's a heavy lift sometimes going through the QC docs to find what you need.

For example, here's what I used to capture frames to disk to validate a ov7251 sensor:

gst-launch-1.0 -e qtiqmmfsrc camera=0 name=tracker ! video/x-h264,format=NV12,width=640,height=480,framerate=30/1 ! queue ! h264parse ! avdec_h264 ! videoconvert ! pngenc ! multifilesink enable-last-sample=false location="/data/misc/camera/cam0_img_%d_.png"

Now the gst- command line stuff is totally out of my wheel house, I generally copy paste commands here just to get my stuff done, but if you are familiar with gst- stuff then you should be able to find what you need on target.

AnthoJack

Great, thank you. I wasn't searching for the right name for the src module ("qmmfsrc" instead of "qtiqmmfsrc"). I'm not exactly knowledgeable about Gstreamer myself, I was just looking for a way to recover and process the images that allowed for a bit more control and configurability to do some tests.

You do seem to support gst stuff though since voxl-streamer uses it

paynej

I've been working on another RB5 platform and am migrating to VOXL. I used a command similar to above:

GST_DEBUG=3 gst-launch-1.0 -e qtiqmmfsrc camera=0 name=tracker ! video/x-h264,format=NV12,width=640,height=480,framerate=30/1 ! queue ! h264parse ! avdec_h264 ! videoconvert ! pngenc ! multifilesink enable-last-sample=false location="/data/misc/camera/cam0_img_%d_.png"

I get images, yet they are greyscale instead of color. Any help would be great!

Jeff

Chad Sweet

Which camera config are you using? https://docs.modalai.com/voxl2-camera-configs/

Are you sure it's not a monochrome image sensor you are using?

paynej

Should be hires and tracking only. I'm trying to use the color hires one. I noticed when using the voxl-streamer, that the tracking one is probably monochrome.
An older /etc/modalai/voxl-camera-server.conf.save shows all 4 cameras, tracking, hires and stereo.

Thanks for your reply. I hope to have this figured out soon.

paynej

C11. I'm trying to use the color hires one. I noticed when using the voxl-streamer, that the tracking ones and stereo is monochrome.

So now

GST_DEBUG=3 gst-launch-1.0 -e qtiqmmfsrc camera=3 ! video/x-raw,format=NV12,width=640,height=480,framerate=2/1 ! queue  ! videoconvert ! jpegenc ! multifilesink enable-last-sample=false location="/data/misc/camera/cam0_img_%d_.jpg"

is giving me no image.

All other cameras (0,1,2,4,5) are working correctly with B/W

If I enable voxl-camera-server and voxl-streamer-hires, then I get a RTSP color stream, so the HW seems good.

Thanks for your reply. I hope to have this figured out soon.

paynej

I think I have the snapshot hires color working! I was grabbing the first picture instead of the last. The first one, the sensor must not be ready.

paynej

Back again...

I have my ML program running now with the qtiqmmfscrc pipeline and disabling voxl-camera-server. I'd like to run voxl-camera-server with just the tracking and stereo cameras so voxl-qvio-server will get data. I tried to remove just the hires camera from /etc/modalai/voxl-camera-server.conf but running voxl-camera-server aborts:

rb5:/$ /usr/bin/voxl-camera-server -d 0
No secondary id found for camera: tracking, assuming mono
Secondary id found for camera: stereo_front, assuming stereo
Secondary id found for camera: stereo_rear, assuming stereo
------ voxl-camera-server: Starting camera server
Attempting to open the hal module
SUCCESS: Camera module opened on attempt 0
Aborted

rb5:/$ more /etc/modalai/voxl-camera-server.conf
{
	"version":	0.1,
	"cameras":	[{
			"name":	"tracking",
			"enabled":	true,
			"frame_rate":	30,
			"type":	"ov7251",
			"camera_id":	2,
			"ae_desired_msv":	60,
			"ae_filter_alpha":	0.600000023841858,
			"ae_ignore_fraction":	0.20000000298023224,
			"ae_slope":	0.05000000074505806,
			"ae_exposure_period":	1,
			"ae_gain_period":	1
		}, {
			"name":	"stereo_front",
			"enabled":	true,
			"frame_rate":	30,
			"type":	"ov7251",
			"camera_id":	0,
			"camera_id_second":	1,
			"ae_desired_msv":	60,
			"ae_filter_alpha":	0.600000023841858,
			"ae_ignore_fraction":	0.20000000298023224,
			"ae_slope":	0.05000000074505806,
			"ae_exposure_period":	1,
			"ae_gain_period":	1
		}, {
			"name":	"stereo_rear",
			"enabled":	true,
			"frame_rate":	30,
			"type":	"ov7251",
			"camera_id":	5,
			"camera_id_second":	4,
			"ae_desired_msv":	60,
			"ae_filter_alpha":	0.600000023841858,
			"ae_ignore_fraction":	0.20000000298023224,
			"ae_slope":	0.05000000074505806,
			"ae_exposure_period":	1,
			"ae_gain_period":	1
		}]
}

Any advice? Thank you for your time.

Chad Sweet

The Qualcomm HAL3 camera framework only allows one application to connect, which is why we created voxl-camera-server. What you want to do is not possible due to this limitation from Qualcomm

paynej

Thank you for the reply. That makes sense.

What are the available outputs of voxl-camera-server? It looks like voxl-qvio-server uses a pipe. Wondering if I have another option to qtiqmmfscrc, rtsp and udp.

Thanks you, I appreciate you taking the time to reply.

Chad Sweet

that is documented here: https://docs.modalai.com/voxl-camera-server/#output-of-camera-server

paynej

The Pipe API worked great! Thanks.

Can the hires camera output RBG instead of NV12 and can voxl-camera-server support that?