On Tue, Aug 08, 2017 at 08:09:33PM -0700, photogd wrote:
> I am making an android app in java that can do bulb capture, it's not using
> libgphoto2, but instead using the hex codes the cameras support. The problem
> is the Canon EDSDK documentation does not give the hex values the camera
> needs for EosRemoteRelease full press, half press, etc.
>
> How does libgphoto2 send this information to the camera? Is it a hex value
> or something else?
>
> This is how what I'm trying to do is done with gphoto2:
>
> gphoto2 --wait-event=2s --set-config eosremoterelease=Immediate
> --wait-event=5s --set-config eosremoterelease=Off
>
> This is how I'm doing it in my java app:
>
> EosRemoteReleaseOn = 0x9128;
> sleep.500ms
> EosRemoteReleaseOff = 0x9129;
>
> However it is doing nothing. I think because I am not passing the
> "immediate" value to the camera over USB PTP. However, I cannot simply pass
> it to the camera as "immediate", there must be a numerical value for it.
> Where in gphoto2 can I find this numerical value? I searched the entire
> codebase for gphoto2 but can't find where this is handled at all.
>
> And when you set this in gphoto2:
> set-config bulb=1
> set-config bulb=0
>
> What is that changing? Where is it located? How is it affecting the PTP Hex
> Codes being sent to the camera?
The bulb code for EOS is here:
https://github.com/gphoto/libgphoto2/blob/master/camlibs/ptp2/config.c#L6317
and the eosremote release code is here:
https://github.com/gphoto/libgphoto2/blob/master/camlibs/ptp2/config.c#L5519
THere the names are mapped to the numbers.
Ciao, Marcus
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