Hello.
On 05/21/2013 06:45 PM, Hans Verkuil wrote:
From: Vladimir Barinov <vladimir.barinov@xxxxxxxxxxxxxxxxxx>
Add subdev video ops for ADV7180 video decoder. This makes decoder usable on
the soc-camera drivers.
Signed-off-by: Vladimir Barinov <vladimir.barinov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
---
This patch is against the 'media_tree.git' repo.
Changes from version 2:
- set the field format depending on video standard in try_mbus_fmt() method;
- removed querystd() method calls from try_mbus_fmt() and cropcap() methods;
- removed g_crop() method.
drivers/media/i2c/adv7180.c | 86 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
Index: media_tree/drivers/media/i2c/adv7180.c
===================================================================
--- media_tree.orig/drivers/media/i2c/adv7180.c
+++ media_tree/drivers/media/i2c/adv7180.c
+
+static int adv7180_try_mbus_fmt(struct v4l2_subdev *sd,
+ struct v4l2_mbus_framefmt *fmt)
+{
+ struct adv7180_state *state = to_state(sd);
+
+ fmt->code = V4L2_MBUS_FMT_YUYV8_2X8;
+ fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
+ fmt->field = state->curr_norm & V4L2_STD_525_60 ?
+ V4L2_FIELD_INTERLACED_BT : V4L2_FIELD_INTERLACED_TB;
Just noticed this: use V4L2_FIELD_INTERLACED as that does the right thing.
No need to split in _BT and _TB.
Hm, testers have reported that _BT vs _TB do make a difference. I'll
try to look into how V4L2 handles interlacing for different standards.
When using V4L2_FIELD_INTERLACED the BT vs TB is implicit (i.e. the application
is supposed to know that the order will be different depending on the standard).
Explicitly using BT/TB is only useful if you want to override the default, e.g.
if a video was encoded using the wrong temporal order.
We have used V4L2_FIELD_INTERLACED before and people reported
incorrect field ordering -- that's why we changed to what it is now. So this
might be an application failure?
WBR, Sergei
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