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spa: libcamera: source: separate type info generation

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Add a new function `control_details_to_pod()` that builds a
`SPA_TYPE_OBJECT_PropInfo` object describing a libcamera control.
This commit is contained in:
Barnabás Pőcze 2025-07-23 13:58:31 +02:00 • committed by Wim Taymans
parent 3c759ae293
commit cc187b035b
1 changed files with 67 additions and 61 deletions
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128
spa/plugins/libcamera/libcamera-source.cpp
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@ -740,6 +740,69 @@ uint32_t prop_id_to_control(uint32_t prop_id)
return SPA_ID_INVALID; return SPA_ID_INVALID;
} }
[[nodiscard]]
spa_pod *control_details_to_pod(spa_pod_builder& b,
const libcamera::ControlId& cid, const libcamera::ControlInfo& cinfo)
{
auto id = control_to_prop_id(cid.id());
spa_pod_frame f;
spa_pod_builder_push_object(&b, &f, SPA_TYPE_OBJECT_PropInfo, SPA_PARAM_PropInfo);
spa_pod_builder_add(&b,
SPA_PROP_INFO_id, SPA_POD_Id(id),
SPA_PROP_INFO_description, SPA_POD_String(cid.name().c_str()),
0);
switch (cid.type()) {
case ControlTypeBool: {
bool def;
if (cinfo.def().isNone())
def = cinfo.min().get<bool>();
else
def = cinfo.def().get<bool>();
spa_pod_builder_add(&b,
SPA_PROP_INFO_type, SPA_POD_CHOICE_Bool(
def),
0);
} break;
case ControlTypeFloat: {
float min = cinfo.min().get<float>();
float max = cinfo.max().get<float>();
float def;
if (cinfo.def().isNone())
def = (min + max) / 2;
else
def = cinfo.def().get<float>();
spa_pod_builder_add(&b,
SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Float(
def, min, max),
0);
} break;
case ControlTypeInteger32: {
int32_t min = cinfo.min().get<int32_t>();
int32_t max = cinfo.max().get<int32_t>();
int32_t def;
if (cinfo.def().isNone())
def = (min + max) / 2;
else
def = cinfo.def().get<int32_t>();
spa_pod_builder_add(&b,
SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Int(
def, min, max),
0);
} break;
default:
return nullptr;
}
return reinterpret_cast<spa_pod *>(spa_pod_builder_pop(&b, &f));
}
int int
spa_libcamera_enum_controls(struct impl *impl, struct port *port, int seq, spa_libcamera_enum_controls(struct impl *impl, struct port *port, int seq,
uint32_t start, uint32_t offset, uint32_t num, uint32_t start, uint32_t offset, uint32_t num,
@ -748,13 +811,10 @@ spa_libcamera_enum_controls(struct impl *impl, struct port *port, int seq,
const ControlInfoMap &info = impl->camera->controls(); const ControlInfoMap &info = impl->camera->controls();
uint8_t buffer[1024]; uint8_t buffer[1024];
struct spa_pod_builder b = { 0 }; struct spa_pod_builder b = { 0 };
struct spa_pod_frame f[2];
struct spa_result_node_params result; struct spa_result_node_params result;
struct spa_pod *ctrl; struct spa_pod *ctrl;
uint32_t count = 0, skip, id; uint32_t count = 0, skip;
int res; int res;
const ControlId *ctrl_id;
ControlInfo ctrl_info;
result.id = SPA_PARAM_PropInfo; result.id = SPA_PARAM_PropInfo;
result.next = start; result.next = start;
@ -767,70 +827,16 @@ spa_libcamera_enum_controls(struct impl *impl, struct port *port, int seq,
next: next:
it++; it++;
} }
result.index = result.next++; result.index = result.next++;
if (it == info.end()) if (it == info.end())
goto enum_end; goto enum_end;
ctrl_id = it->first;
ctrl_info = it->second;
id = control_to_prop_id(ctrl_id->id());
spa_pod_builder_init(&b, buffer, sizeof(buffer)); spa_pod_builder_init(&b, buffer, sizeof(buffer));
spa_pod_builder_push_object(&b, &f[0], SPA_TYPE_OBJECT_PropInfo, SPA_PARAM_PropInfo);
spa_pod_builder_add(&b,
SPA_PROP_INFO_id, SPA_POD_Id(id),
SPA_PROP_INFO_description, SPA_POD_String(ctrl_id->name().c_str()),
0);
switch (ctrl_id->type()) { ctrl = control_details_to_pod(b, *it->first, it->second);
case ControlTypeBool: { if (!ctrl)
bool def;
if (ctrl_info.def().isNone())
def = ctrl_info.min().get<bool>();
else
def = ctrl_info.def().get<bool>();
spa_pod_builder_add(&b,
SPA_PROP_INFO_type, SPA_POD_CHOICE_Bool(
def),
0);
} break;
case ControlTypeFloat: {
float min = ctrl_info.min().get<float>();
float max = ctrl_info.max().get<float>();
float def;
if (ctrl_info.def().isNone())
def = (min + max) / 2;
else
def = ctrl_info.def().get<float>();
spa_pod_builder_add(&b,
SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Float(
def, min, max),
0);
} break;
case ControlTypeInteger32: {
int32_t min = ctrl_info.min().get<int32_t>();
int32_t max = ctrl_info.max().get<int32_t>();
int32_t def;
if (ctrl_info.def().isNone())
def = (min + max) / 2;
else
def = ctrl_info.def().get<int32_t>();
spa_pod_builder_add(&b,
SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Int(
def, min, max),
0);
} break;
default:
goto next; goto next;
}
ctrl = (struct spa_pod*) spa_pod_builder_pop(&b, &f[0]);
if (spa_pod_filter(&b, &result.param, ctrl, filter) < 0) if (spa_pod_filter(&b, &result.param, ctrl, filter) < 0)
goto next; goto next;