Re: Fwd: Pentax KP

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


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