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| author | Naushir Patuck <naush@raspberrypi.com> | 2021-01-19 15:30:45 +0000 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-01-20 14:13:50 +0200 |
| commit | 6232ec3c164102eb59c2deec9facb6552b55cca0 (patch) | |
| tree | 54c3727bfb144b03b4b9c7721724985e684514e5 | |
| parent | dce1568a8a81f28592ba2ec9993fde1f39096031 (diff) | |
libcamera: controls: Add frame duration control
Add an int64_t 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@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Tested-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
| -rw-r--r-- | src/libcamera/control_ids.yaml | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml index 3c5f4469..b4771f9d 100644 --- a/src/libcamera/control_ids.yaml +++ b/src/libcamera/control_ids.yaml @@ -323,6 +323,43 @@ controls: step to respect the received gain factor and shall report their total value in the request metadata. + - FrameDurations: + type: int64_t + description: | + The minimum and maximum (in that order) frame duration, + expressed in microseconds. + + When provided by applications, the control specifies the sensor frame + duration interval the pipeline has to use. This limits the largest + exposure time 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 to raise the exposure time above 33ms. + A fixed frame duration is achieved by setting the minimum and maximum + values to be the same. Setting both values to 0 reverts to using the + IPA provided defaults. + + The maximum frame duration provides the absolute limit to the shutter + speed computed by the AE algorithm and it overrides any exposure mode + setting specified with controls::AeExposureMode. Similarly, when a + manual exposure time is set through controls::ExposureTime, it also + gets clipped to the limits set by this control. When reported in + metadata, the control expresses the minimum and maximum frame + durations used after being clipped to the sensor provided frame + duration limits. + + \sa AeExposureMode + \sa ExposureTime + + \todo Define how to calculate the capture frame rate by + defining controls to report additional delays introduced by + the capture pipeline or post-processing stages (ie JPEG + conversion, frame scaling). + + \todo Provide an explicit definition of default control values, for + this and all other controls. + + size: [2] + # ---------------------------------------------------------------------------- # Draft controls section |