linux-kernel - [PATCH] v4l: add V4L2_CID_MPEG_VIDEO_FORCE_FRAME

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Message-Id: <1452686611-145620-1-git-send-email-wuchengli@chromium.org>
Date:	Wed, 13 Jan 2016 20:03:30 +0800
From:	Wu-Cheng Li <wuchengli@...omium.org>
To:	pawel@...iak.com, mchehab@....samsung.com, hverkuil@...all.nl,
	k.debski@...sung.com, crope@....fi, standby24x7@...il.com,
	wuchengli@...omium.org, nicolas.dufresne@...labora.com,
	ricardo.ribalda@...il.com, ao2@....it, bparrot@...com
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: [PATCH] v4l: add V4L2_CID_MPEG_VIDEO_FORCE_FRAME_TYPE

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(+)

-- 
2.6.0.rc2.230.g3dd15c0