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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Add an int64_t array control (controls::FrameDurations) to specify the\nminimum and maximum (in that order) frame duration to be used by the\ncamera sensor.\n\nSigned-off-by: Naushir Patuck \nReviewed-by: David Plowman \nTested-by: David Plowman \nReviewed-by: Jacopo Mondi \n---\n src/libcamera/control_ids.yaml | 36 ++++++++++++++++++++++++++++++++++\n 1 file changed, 36 insertions(+)","diff":"diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml\nindex 6d6f0fee508b..36c37161a3d5 100644\n--- a/src/libcamera/control_ids.yaml\n+++ b/src/libcamera/control_ids.yaml\n@@ -306,6 +306,42 @@ controls:\n maximum valid value is given by the properties::ScalerCropMaximum\n property, and the two can be used to implement digital zoom.\n \n+ - FrameDurations:\n+ type: int64_t\n+ description: |\n+ The minimum and maximum (in that order) frame duration,\n+ expressed in micro-seconds.\n+\n+ When provided by applications, the control specifies the sensor frame\n+ duration interval the pipeline has to use. This limits the largest\n+ exposure time the sensor can use. For example, if a maximum frame\n+ duration of 33ms is requested (corresponding to 30 frames per second),\n+ the sensor will not be able to raise the exposure time above 33ms.\n+ A fixed frame duration is achieved by setting the minimum and maximum\n+ values to be the same. Setting both values to 0 reverts to using the\n+ IPA provided defaults.\n+\n+ The maximum frame duration provides the absolute limit to the shutter\n+ speed computed by the AE algorithm and it overrides any exposure mode\n+ setting specified with controls::AeExposureMode. Similarly, when a\n+ manual exposure time is set through controls::ExposureTime, it also\n+ gets clipped to the limits set by this control. When reported in\n+ metadata, the control expresses the minimum and maximum frame\n+ durations used after being clipped to the sensor provided frame\n+ duration limits.\n+\n+ \\sa AeExposureMode\n+ \\sa ExposureTime\n+\n+ \\todo Define how to calculate the capture frame rate by\n+ defining controls to report additional delays introduced by\n+ the capture pipeline or post-processing stages (ie JPEG\n+ conversion, frame scaling).\n+\n+ \\todo Provide an explicit definition of default control values, for\n+ this and all other controls.\n+ size: [2]\n+\n # ----------------------------------------------------------------------------\n # Draft controls section\n \n","prefixes":["libcamera-devel","v12","1/3"]}