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libcamera: uvcvideo: Register ExposureTimeMode control

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Port the UVC pipeline handler to use the new ExposureTimeMode control
when processing Camera controls in place of the AeEnable control.

The V4L2_CID_EXPOSURE_AUTO control allows 4 possible values, which
map to ExposureTimeModeAuto and ExposureTimeModeManual.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Jacopo Mondi 2025-01-13 15:59:37 -06:00 • committed by Laurent Pinchart
parent 128220a139
commit bad8d591f8
1 changed files with 48 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

53
src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
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@ -298,7 +298,7 @@ int PipelineHandlerUVC::processControl(ControlList *controls, unsigned int id,
cid = V4L2_CID_CONTRAST;
else if (id == controls::Saturation)
cid = V4L2_CID_SATURATION;
else if (id == controls::AeEnable)
else if (id == controls::ExposureTimeMode)
cid = V4L2_CID_EXPOSURE_AUTO;
else if (id == controls::ExposureTime)
cid = V4L2_CID_EXPOSURE_ABSOLUTE;
@ -647,7 +647,7 @@ void UVCCameraData::addControl(uint32_t cid, const ControlInfo &v4l2Info,
id = &controls::Saturation;
break;
case V4L2_CID_EXPOSURE_AUTO:
id = &controls::AeEnable;
id = &controls::ExposureTimeMode;
break;
case V4L2_CID_EXPOSURE_ABSOLUTE:
id = &controls::ExposureTime;
@ -660,6 +660,7 @@ void UVCCameraData::addControl(uint32_t cid, const ControlInfo &v4l2Info,
}
/* Map the control info. */
const std::vector<ControlValue> &v4l2Values = v4l2Info.values();
int32_t min = v4l2Info.min().get<int32_t>();
int32_t max = v4l2Info.max().get<int32_t>();
int32_t def = v4l2Info.def().get<int32_t>();
@ -697,10 +698,52 @@ void UVCCameraData::addControl(uint32_t cid, const ControlInfo &v4l2Info,
};
break;
case V4L2_CID_EXPOSURE_AUTO:
info = ControlInfo{ false, true, true };
break;
case V4L2_CID_EXPOSURE_AUTO: {
/*
* From the V4L2_CID_EXPOSURE_AUTO documentation:
*
* ------------------------------------------------------------
* V4L2_EXPOSURE_AUTO:
* Automatic exposure time, automatic iris aperture.
*
* V4L2_EXPOSURE_MANUAL:
* Manual exposure time, manual iris.
*
* V4L2_EXPOSURE_SHUTTER_PRIORITY:
* Manual exposure time, auto iris.
*
* V4L2_EXPOSURE_APERTURE_PRIORITY:
* Auto exposure time, manual iris.
*-------------------------------------------------------------
*
* ExposureTimeModeAuto = { V4L2_EXPOSURE_AUTO,
* V4L2_EXPOSURE_APERTURE_PRIORITY }
*
*
* ExposureTimeModeManual = { V4L2_EXPOSURE_MANUAL,
* V4L2_EXPOSURE_SHUTTER_PRIORITY }
*/
std::array<int32_t, 2> values{};
auto it = std::find_if(v4l2Values.begin(), v4l2Values.end(),
[&](const ControlValue &val) {
return (val.get<int32_t>() == V4L2_EXPOSURE_APERTURE_PRIORITY ||
val.get<int32_t>() == V4L2_EXPOSURE_AUTO) ? true : false;
});
if (it != v4l2Values.end())
values.back() = static_cast<int32_t>(controls::ExposureTimeModeAuto);
it = std::find_if(v4l2Values.begin(), v4l2Values.end(),
[&](const ControlValue &val) {
return (val.get<int32_t>() == V4L2_EXPOSURE_SHUTTER_PRIORITY ||
val.get<int32_t>() == V4L2_EXPOSURE_MANUAL) ? true : false;
});
if (it != v4l2Values.end())
values.back() = static_cast<int32_t>(controls::ExposureTimeModeManual);
info = ControlInfo{Span<int32_t>{values}, values[0]};
break;
}
case V4L2_CID_EXPOSURE_ABSOLUTE:
/*
* ExposureTime is in units of 1 µs, and UVC expects