[gphoto-devel] Problems with capture on Canon S110 et al

[Egil K. <eg...@kv...>]

I am trying to do remote capture on a "Canon IXUS v" (which is the same
as "Canon Powershot S110" in the US market), but it fails. Several bugs
on the matter have already been filed, so there is probably no point in
adding one more. Fetching files on this camera works perfectly, btw.

The remote control page http://www.gphoto.org/doc/remote/ says that
capture is supported, and requesting abilities from gphoto2 lists Image
and Preview as being available. Also the Canon US page indicates remote
capture is possible.
http://www.usa.canon.com/consumer/controller?act=SDKHomePageAct&keycode=Sdk_Lic&fcategoryid=314&modelid=7474&id=3464

However, on the net I found a couple of texts indicating that for
cameras like the A60, A70, A75 etc gphoto2 only supports capture in PTP
mode, not Canon mode.

The S110 does as far as I know not support PTP.  I believe there is a
whole little family of cameras that behave the same.

It seems to me that the problem is that gphoto2 may not be supporting
the type of Canon command required to do capture on the S110 and similar
cameras. Is this correct? When trying to do a capture, the lens does
extend etc, but the sequence is somehow interrupted.

Based on looking at my own log and the other logs posted, the common
denominator for the problem seems to be:

    0.314597 canon/canon/canon.c(2): Camera control init++ with 0, 0
    0.314621 canon/canon/usb.c(2): canon_usb_dialogue_full() cmd 0x13
    0x12 0x201 (Remote camera control)
    0.314645 canon/canon/usb.c(2): canon_usb_dialogue_full() called with
    CONTROL_CAMERA, Camera control init
    0.314668 canon/canon/usb.c(2): Payload :
    0.314691 canon(3): Hexdump of 8 = 0x8 bytes follows:
    0000  00 00 00 00 00 00 00 00-                         ........       

    0.314735 gphoto2-port(2): Writing message (request=0x4 value=0x10
    index=0x0 size=88=0x58)...
    0.314764 gphoto2-port(3): Hexdump of 88 = 0x58 bytes follows:
    0000  18 00 00 00 01 02 00 00-00 00 00 00 00 00 00 00  ................
    0010  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
    0020  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
    0030  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
    0040  02 00 00 00 13 00 00 12-18 00 00 00 04 00 00 00  ................
    0050  00 00 00 00 00 00 00 00-                         ........       

    0.315835 gphoto2-port(2): Reading 64=0x40 bytes from port...
    2.234491 gphoto2-port(2): Could only read 0 out of 64 byte(s)
    2.234585 gphoto2-port(3): Empty hexdump of empty buffer
    2.234611 canon/canon/usb.c(2): canon_usb_dialogue_full: read 1 of
    0x40 bytes failed! (returned 0)
    2.234636 canon/canon/canon.c(2): Camera control init datalen=ffffffb0

The question is then, is there any way of fixing this? If anyone can
give me some hints, I am happy to do some experimenting.

Otherwise, the ghoto2 capture documentation page should be updated so as
to indicate that the S110 and other cameras are indeed NOT supported
with capture. As it is, it is rather misleading.

Sincerely,

Egil Kvaleberg