On 2022-08-20 15:37, fu7 wrote:
I've build the last comit on gitHub in a package for Solus and with
Pentax KP in PTB mode I have the following:
'$ gphoto2 --auto-detect Modello Porta
---------------------------------------------------------- Pentax KP
(PTP Mode) usb:001,014 '
but
'$ env LANG=C gphoto2 --debug --debug-logfile=my-logfile.txt
--capture-image *** Error *** Sorry, your camera does not support
generic capture ERROR: Could not capture image. ERROR: Could not
capture. *** Error (-6: 'Unsupported operation') *** '
If it can be useful, I would like to signal the following:
https://api.ricoh/docs/camera-usb-sdk-cpp/quick-start-linux/#run-sample-app
I see two take away here:
1. the camera doesn't support the generic capture implemented with PTP.
This is not uncommon.
2. but it does support a non standard one, that seems to be implemented
in proprietary code from Ricoh using a modified version of libmtp, a
FLOSS library. If you are a Ricoh customer I encourage you to request
the documentation they don't seem to publish. After all they save
millions of doller in engineering by taking libmtp.
Just for the detail, MTP is already a fork of PTP that Microsoft
developed for music players.
Otherwise it looks like there is a good amount of reverse engineering
necessary. I would take the approach of shiming libmtp to spy on the API
calls, for started. It's probably easier than USB sniffing.
Hub
_______________________________________________
Gphoto-devel mailing list
Gphoto-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/gphoto-devel
