[libcamera-devel] [PATCH v4 1/3] libcamera: controls: Add frame duration control
David Plowman
david.plowman at raspberrypi.com
Thu Dec 10 09:44:53 CET 2020
Hi Naush
Thanks for the patch, I have been eagerly awaiting this set!
On Wed, 9 Dec 2020 at 10:26, Naushir Patuck <naush at raspberrypi.com> wrote:
>
> Add a float array control (controls::FrameDurations) to specify the
> minimum and maximum (in that order) frame duration to be used by the
> camera sensor.
>
> Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
> ---
> src/libcamera/control_ids.yaml | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml
> index 6d6f0fee..cd44a620 100644
> --- a/src/libcamera/control_ids.yaml
> +++ b/src/libcamera/control_ids.yaml
> @@ -554,4 +554,17 @@ controls:
> detection, additional format conversions etc) count as an additional
> pipeline stage.
>
> + - FrameDurations:
> + type: float
> + description: |
> + Specifies the minimum and maximum (in that order) allowable frame
> + duration, in micro-seconds, for the sensor to use. This could also limit
> + the largest exposure times the sensor can use. For example, if a maximum
> + frame duration of 33ms is requested (corresponding to 30 frames per
> + second), the sensor will not be able raise the exposure time above 33ms.
> + Note that the sensor may not always be able to provide the requested
> + frame duration limits depending on its mode configuration.
Is it worth remarking that they can be set to the same values to give
a fixed fps mode of operations? Or is that too obvious to mention?
Reviewed-by: David Plowman <david.plowman at raspberrypi.com>
Tested-by: David Plowman <david.plowman at raspberrypi.com>
Best regards
David
> +
> + \sa ExposureTime
> + size: [2]
> ...
> --
> 2.25.1
>
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