[libcamera-devel] libcamera on pinephone

[Pavel Machek]

Hi!

> > > > Could you print the length of all planes and see how they look like in
> > > > memory ? Also note that the two planes have the same fd so they
> > > > seem to be contiguous in memory if I'm not mistaken ?
> > 
> > That may be above my skill level (sorry).
> > 
> > > We really need data offset support for V4L2 buffer planes in the V4L2
> > > API :-S See http://lore.kernel.org/linux-media/20200804192939.2251988-3-helen.koike@collabora.com/
> > 
> > But I understood enough to realize that I420 is problematic, switched
> > to 1280x720-BA810x31384142 and now I have... something ;-).
> 
> How did you switch to that format ? The `cam -I` output below lists
> SBGGR8 only, which surprises me as I thought both sensors of the
> Pinephone had an internal ISP, and supported outputting YUV.
> 
> If you've hacked sources somewhere to disable other formats, that
> shouldn't be needed. The `-s pixelformat=...` argument to cam lets you
> pick a pixel format on the command line.

Ok, thanks for hints. I indeed hacked the sources. I believe I need to
select SBGGR8 for final capture and SBGGR8_1X8 as data format inside
the pipeline. Can I do that with -s option?

> > Hmm. Is SDL not able to display SBGGR8? Is there anything else I can
> > try before trying to play with gstreamer?
> 
> SDL doesn't support Bayer formats, no. We would need to apply a software
> conversion first.
> 
> One option, if you can install Qt on the Pinephone, is to use qcam
> instead. It supports debayering (when using the GLES backend, see `qcam
> -h`).

Thanks, it works okay using gles. I don't think I can capture still
images; I should have TIFF available.

> Another simpler option is to use YUYV (assuming it's supported), with
> `-s pixelformat=YUYV`.

That one does not work for some reason.

Would something like this make sense? I do not see other obvious place
to tell if TIFF was detected.

Best regards,
								Pavel

diff --git a/src/qcam/main.cpp b/src/qcam/main.cpp
index d3f01a85..1884b2ed 100644
--- a/src/qcam/main.cpp
+++ b/src/qcam/main.cpp
@@ -45,8 +45,14 @@ OptionsParser::Options parseOptions(int argc, char *argv[])
 			 "Print verbose log messages", "verbose");
 
 	OptionsParser::Options options = parser.parse(argc, argv);
-	if (options.isSet(OptHelp))
+	if (options.isSet(OptHelp)) {
 		parser.usage();
+#ifdef HAVE_TIFF
+		qInfo() << "TIFF/DNG support available.";
+#else
+		qInfo() << "TIFF/DNG support NOT available, taking still images not possible";
+#endif
+	}
 
 	return options;
 }


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