[PATCH] v4l: add V4L2_CID_MPEG_VIDEO_FORCE_FRAME_TYPE

Wu-Cheng Li
2016-01-13T12:03:48Z

Some drivers also need a control like
V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE to force an encoder frame
type. This patch adds a general V4L2_CID_MPEG_VIDEO_FORCE_FRAME_TYPE.

This control only affects the next queued buffer. There's no need to
clear the value after requesting an I frame. But all controls are set
in v4l2_ctrl_handler_setup. So a default DISABLED value is required.
Basically this control is like V4L2_CTRL_TYPE_BUTTON with parameters.
How to prevent a control from being set in v4l2_ctrl_handler_setup so
DISABLED value is not needed? Does it make sense not to set a control
if it is EXECUTE_ON_WRITE?

Wu-Cheng Li (1):
v4l: add V4L2_CID_MPEG_VIDEO_FORCE_FRAME_TYPE.

Documentation/DocBook/media/v4l/controls.xml | 23 +++++++++++++++++++++++
drivers/media/v4l2-core/v4l2-ctrls.c | 13 +++++++++++++
include/uapi/linux/v4l2-controls.h | 5 +++++
3 files changed, 41 insertions(+)

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2.6.0.rc2.230.g3dd15c0