diff options
| author | Joe Rayhawk <jrayhawk@freedesktop.org> | 2013-05-18 02:28:53 -0700 |
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| committer | Joe Rayhawk <jrayhawk@freedesktop.org> | 2013-05-18 02:28:53 -0700 |
| commit | 1c1de8ee1540372560a488696cc510772ad594c3 (patch) | |
| tree | d35fbf3fc36e84013728f5a30d0cc03330074337 /ScanService.mdwn | |
| parent | b1a220bc8d4e210b719bd628cdd2c108fd8e04b7 (diff) | |
moin2mdwn: convert page ScanService
Diffstat (limited to 'ScanService.mdwn')
| -rw-r--r-- | ScanService.mdwn | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/ScanService.mdwn b/ScanService.mdwn new file mode 100644 index 00000000..6a49f75e --- /dev/null +++ b/ScanService.mdwn @@ -0,0 +1,48 @@ + +{i} This page state about a scanner service in freedesktop. This document was started off a discussion at xdg mailing list : [[http://lists.freedesktop.org/archives/xdg/2007-January/009074.html|http://lists.freedesktop.org/archives/xdg/2007-January/009074.html]] + + +## Goals + +* Monitor buttons +* Share devices +These feature imply that the software own the device handle, this is why the software expose acquisition API. + +* Acquire image + +## Achievement + +This can be done through a dbus system wide daemon. + + +## DBus API + +This is a rough draft of an API -- [[EtienneBersac|EtienneBersac]] 2007-01-28 22:21:45 + +* device_list [[GetDeviceList|GetDeviceList]] +* string [[GetDeviceInfo|GetDeviceInfo]] (device) +* option_list [[GetDeviceOptions|GetDeviceOptions]] (device) +* [[ShareDevice|ShareDevice]] (device, boolean) +* job [[StartScan|StartScan]] (device, settings) +* [[StopScan|StopScan]] (job) +* [[GetImage|GetImage]] (job) +/!\ How to monitor ? How to get buttons events ? How should the image be transferred back to the client? + +* A file descriptor or device node might be one way for transferring the image quickly (sending it directly over D-BUS definitely wouldn't work). +Signals : + +* device-plugged (device) +* device-unplugged +* button-pressed (device, button) +* job-done (job) + +## Scanner access + +Scanner access is done through the famous SANE library. Hope that HAL & SANE will work better together in the future in order to get devices from HAL. + + +## Sharing + +SANE has a net scanning protocol. However, it shows some limitation (basically, it's too slow for huge image). What to do ? + +* It would be nice to come up with a new protocol for this like the D-BUS one, maybe with some kind of compression, like bzip2. I wouldn't worry about breaking compatibility. -- [[DonaldStraney|DonaldStraney]]
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