On Wed, Jan 13, 2016 at 11:02 PM, Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx> wrote: > Le mercredi 13 janvier 2016 à 20:03 +0800, Wu-Cheng Li a écrit : >> 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? > > I don't like the way it's implemented. I don't know any decoder that > have a frame type forcing feature other they I-Frame. It would be much > more natural to use a toggle button control (and add more controls for > other types when needed) then trying to merge hypothetical toggles into > something that manually need to be set and disabled. Using a button control sounds like a good idea. I'll discuss with other people and reply tomorrow. > >> >> 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(+) >> -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
