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Subject: [media] vivid: do not allow video loopback for SEQ_TB/BT Author: Hans Verkuil <[email protected]> Date: Mon Mar 9 10:06:55 2015 -0300 Sequential top-bottom/bottom-top fields are not supported as video loopback. This is too much work to implement for field settings that are rarely used. Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Documentation/video4linux/vivid.txt | 5 +++++ drivers/media/platform/vivid/vivid-vid-common.c | 7 +++++++ 2 files changed, 12 insertions(+), 0 deletions(-) --- http://git.linuxtv.org/cgit.cgi/media_tree.git/commit/?id=ba24b442033b7f50e24798685f4b24b8e4c3aaa2 diff --git a/Documentation/video4linux/vivid.txt b/Documentation/video4linux/vivid.txt index 6cfc854..cd4b5a1 100644 --- a/Documentation/video4linux/vivid.txt +++ b/Documentation/video4linux/vivid.txt @@ -912,6 +912,11 @@ looped to the video input provided that: sequence and field counting in struct v4l2_buffer on the capture side may not be 100% accurate. +- field settings V4L2_FIELD_SEQ_TB/BT are not supported. While it is possible to + implement this, it would mean a lot of work to get this right. Since these + field values are rarely used the decision was made not to implement this for + now. + - on the input side the "Standard Signal Mode" for the S-Video input or the "DV Timings Signal Mode" for the HDMI input should be configured so that a valid signal is passed to the video input. diff --git a/drivers/media/platform/vivid/vivid-vid-common.c b/drivers/media/platform/vivid/vivid-vid-common.c index 6bef1e6..49c9bc6 100644 --- a/drivers/media/platform/vivid/vivid-vid-common.c +++ b/drivers/media/platform/vivid/vivid-vid-common.c @@ -210,6 +210,13 @@ bool vivid_vid_can_loop(struct vivid_dev *dev) return false; if (dev->field_cap != dev->field_out) return false; + /* + * While this can be supported, it is just too much work + * to actually implement. + */ + if (dev->field_cap == V4L2_FIELD_SEQ_TB || + dev->field_cap == V4L2_FIELD_SEQ_BT) + return false; if (vivid_is_svid_cap(dev) && vivid_is_svid_out(dev)) { if (!(dev->std_cap & V4L2_STD_525_60) != !(dev->std_out & V4L2_STD_525_60)) _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
