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libcamera: v4l2_device: Support reading U8 array controls

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Add support to retrieve the value of array controls of type
V4L2_CTRL_TYPE_U8.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Jacopo Mondi 2020-03-04 17:57:02 +01:00 • committed by Laurent Pinchart
parent 0aa8e09775
commit 3786b6c84b
1 changed files with 26 additions and 1 deletions
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27
src/libcamera/v4l2_device.cpp
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@ -176,7 +176,7 @@ int V4L2Device::getControls(ControlList *ctrls)
memset(v4l2Ctrls, 0, sizeof(v4l2Ctrls));
unsigned int i = 0;
for (const auto &ctrl : *ctrls) {
for (auto &ctrl : *ctrls) {
unsigned int id = ctrl.first;
const auto iter = controls_.find(id);
if (iter == controls_.end()) {
@ -185,6 +185,31 @@ int V4L2Device::getControls(ControlList *ctrls)
return -EINVAL;
}
const struct v4l2_query_ext_ctrl &info = controlInfo_[id];
ControlValue &value = ctrl.second;
if (info.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD) {
ControlType type;
switch (info.type) {
case V4L2_CTRL_TYPE_U8:
type = ControlTypeByte;
break;
default:
LOG(V4L2, Error)
<< "Unsupported payload control type "
<< info.type;
return -EINVAL;
}
value.reserve(type, true, info.elems);
Span<uint8_t> data = value.data();
v4l2Ctrls[i].p_u8 = data.data();
v4l2Ctrls[i].size = data.size();
}
v4l2Ctrls[i].id = id;
i++;
}