Bug 17188 - V4L version information insufficient
Summary: V4L version information insufficient
Status: NEW
Alias: None
Product: hal
Classification: Unclassified
Component: misc (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: David Zeuthen (not reading bugmail)
QA Contact:
Depends on:
Reported: 2008-08-18 07:11 UTC by Sven Herzberg
Modified: 2008-09-15 02:51 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Proposed Patch (4.60 KB, patch)
2008-08-22 15:28 UTC, Sven Herzberg
Details | Splinter Review
Proposed Patch (4.60 KB, patch)
2008-08-22 20:33 UTC, Sven Herzberg
Details | Splinter Review

Description Sven Herzberg 2008-08-18 07:11:15 UTC
Currently the video4linux.version string is described as "MAX([supported versions])", which is not good. And here's one concrete example followed by a hypothetic example.

1. Camorama
Camorama only supports video4linux version 1 (right now, of course version 2 support is planned). As of today, there's no chance to find out if a webcam supports video4linux 1 (because, as soon as it supports version 2, the supported version will get increased to "2").

2. Upcoming Changes
So, right now, one could argue, "implement v4l2 and be happy"; but then, there's no guarantee that there won't be a video4linux 3 API and then the same issues would pop up again.

So here's my proposal: Keep the key as it is (but deprecate it's usage, tell people it will disappear in the future); and add "video4linux.versions" which returns an array of int (so I can check if that array contains "1" and be happy).
Comment 1 Sven Herzberg 2008-08-22 20:33:01 UTC
Created attachment 18473 [details] [review]
Proposed Patch

Here's a patch I propose. It changes the hald probe tool and updates the specification.

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