[media] stk1160: Add frame scaling support

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This commit implements frame decimation for stk1160, which allows
to support format changes instead of a static frame size.

The stk1160 supports independent row and column decimation, in two
different modes:
 * set a number of rows/columns units to skip for each unit sent.
 * set a number of rows/columns units to send for each unit skipped.

This effectively allows to achieve different frame scaling ratios.

The unit number can be set to either two row/columns sent/skipped,
or four row/columns sent/skipped. Since the video format (UYVY)
has 4-bytes, using a unit number of two row/columns results
in frame color 'shifting', so set to four row/columns sent/skipped.

Signed-off-by: Michael Stegemann <michael@stegemann.it>
Signed-off-by: Dale Hamel <dale.hamel@srvthe.net>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

...

This commit is contained in:

Ezequiel Garcia 2015-07-03 16:11:42 -03:00 • committed by Mauro Carvalho Chehab

parent 890024ad14

commit d3194520e2

2 changed files with 207 additions and 28 deletions

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34

drivers/media/usb/stk1160/stk1160-reg.h

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209

drivers/media/usb/stk1160/stk1160-v4l.c

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