libcamera for Raspberry Pi etc.

[MarkMLl]

Has anybody looked at libcamera? This is a fairly new library which operates in parallel with the standard v4l2 stuff and provides extra facilities on e.g. the new Raspberry Pi 12MPx camera.

https://libcamera.org/index.html  https://libcamera.org/entries/2020-05-05.html

HOWEVER, if I'm reading https://git.linuxtv.org/libcamera.git/tree/src properly it appears to be defined in C++, so it's not possible to use it directly from Lazarus.

MarkMLl

[BlueIcaro]

Hi, de package Sdpo, use v4l2 to access to a usb cam (I think). I played with it at work. Now I'm hollidays, so I cant checkit,

v4l2 it a "driver" to access to vídeo cam, tv decoders, etc in linux.
And it's written in C.

You can find the documentation: https://www.kernel.org/doc/html/v4.15/media/uapi/v4l/v4l2.html

As soon I arrive to work, I going to check my work with V4l2 and lazarus. I can share with you the information about v4l2 and  lazarus.

/BlueIcaro

[MarkMLl]

v4l2 it a "driver" to access to vídeo cam, tv decoders, etc in linux.
And it's written in C.

I know, I've been using it for twenty years.

Now tell me what you know about libcamera.

MarkMLl

[af0815]

i see the same as you MarkMLI, it looks C++ and not useable direct by fpc/Lazarus and i see no additive goodies for me.

v4l and gstreamer are well known and settled in fpc/Lazarus but libcamera ist not a must have for me. And if you use gstreamer you can use libcamera as an extra source. So i think it is better to use gstreamer :-) direct.

AND gstreamer is available on Linux/Raspibian and Windows too.

[MarkMLl]

i see the same as you MarkMLI, it looks C++ and not useable direct by fpc/Lazarus and i see no additive goodies for me.

v4l and gstreamer are well known and settled in fpc/Lazarus but libcamera ist not a must have for me. And if you use gstreamer you can use libcamera as an extra source. So i think it is better to use gstreamer :-) direct.

AND gstreamer is available on Linux/Raspibian and Windows too.

Recent versions of libcamera can do things like retrieving the image status in a way that can be used to drive autofocus. I believe that if it's being used to capture the video that can be emitted as status messages, so while messy I think that a development framework written using e.g. Lazarus could exploit that.

MarkMLl

[BlueIcaro]

Hi, I never work with libCamera, but a quick glance, I found that there is some C files (I think), in a folfer called "Include", here:
https://github.com/kbingham/libcamera/tree/master/include/libcamera

May some one with more knowledge than me, in this library can tell us if we can use the library with this files.

/BlueIcaro

[MarkMLl]

I'd missed that since I was looking at the official repository. I'll take a look at that when I have a chance and report back.

MarkMLl

[MarkMLl]

No, that's still C++. camera.h is full of class definitions etc.

Code: C  [Select][+][-]

1. class FrameBuffer;
2. class FrameBufferAllocator;
3. class PipelineHandler;
4. class Request;
5.  
6. class CameraConfiguration
7. {
8. public:
9.         enum Status {
10.                 Valid,
11.                 Adjusted,
12.                 Invalid,
13.         };
14.  
15.         using iterator = std::vector<StreamConfiguration>::iterator;
16.         using const_iterator = std::vector<StreamConfiguration>::const_iterator;
17.  
18.         virtual ~CameraConfiguration();
19. ...
20.  

MarkMLl