Remove use of V4L API or make it conditional on < 2.6.38 kernel

[superm1@…]

Kernel 2.6.38 is dropping support for the V4L API and only supporting V4L2. Consequently videodev.h is no longer available and it's not possible to compile MythTV with V4L support against 2.6.38.

[theasp@…]

Do you intend to remove V4L entirely or just the use of the V4L1 header? Removing V4L will result in not supporting many capture cards.

[stuartm]

Trac is not a discussion forum. A developer hasn't even looked at this ticket yet, let alone made any decisions.

[mike.gh.larsen@…]

Patch against fixes/0.24

[Mario Limonciello <superm1@…>]

Mike larsen accidentally posted that patch reversed. He added one to the corresponding Ubuntu launchpad bug (​https://bugs.launchpad.net/ubuntu/+source/mythtv/+bug/717717) that is fixed. Here it is.

[danielk]

It would be useful if the patch were available against the mythtv-rec2 branch as well. Also we should only disable V4L1 when the distro doesn't support it; I don't know if the patch already does that I'm not looking at multi-line patches to the recorder implementations in trunk right now.

[andrew@…]

With this patch, I still see errors in the log file related to V4L1

2011-05-09 09:00:52.951 format_to_mode() does not recognize V4L1
2011-05-09 09:00:52.975 mythbackend: Problem with capture cards: Card 1failed init
2011-05-09 09:00:53.006 format_to_mode() does not recognize V4L1
2011-05-09 09:00:53.034 mythbackend: Problem with capture cards: Card 2failed init

[warped <warpme@…>]

v4l2 patch for rec2 branch

[warped <warpme@…>]

rec2 compilation error

[warped <warpme@…>]

Replying to danielk:

It would be useful if the patch were available against the mythtv-rec2 branch as well. Also we should only disable V4L1 when the distro doesn't support it; I don't know if the patch already does that I'm not looking at multi-line patches to the recorder implementations in trunk right now.

Daniel, I ported patch to rec2 but unfortunately I can't successfully compile mythtc-rec2 0.25pre-2043-g53a8591 to verify is my port correct (I believe issue is not related to v4l2 patch). I'm attaching patch and log from compilation. I'm compiling on fresh ArchLinux? so maybe some sys libs are "too' new....

[gigem]

Replying to warped <warpme@…>:

Daniel, I ported patch to rec2 but unfortunately I can't successfully compile mythtc-rec2 0.25pre-2043-g53a8591 to verify is my port correct (I believe issue is not related to v4l2 patch). I'm attaching patch and log from compilation. I'm compiling on fresh ArchLinux? so maybe some sys libs are "too' new....

Daniel, others and I discussed this patch a couple of weeks ago. The main problem with it is that it treats v4l1 and v4l2 independently and allows for a v4l1 only configuration which we do not support. The patch needs to be reworked so that it only supports v4l2 with or without v4l1. IOW, v4l1 support needs to be conditional on v4l2 being available.

[Github]

Fixes #9595. Allows MythTV to compile on newer Linux distro's that don't include V4L version 1 headers.

Branch: master Changeset: 893edf31f911c12d29530e2c2901da869217bd7c

[beirdo]

Was referenced in pull request: ​https://github.com/MythTV/mythtv/pull/3

I will close that as this has it covered.