diff options
Diffstat (limited to 'src/libcamera/sensor/camera_sensor.cpp')
| -rw-r--r-- | src/libcamera/sensor/camera_sensor.cpp | 34 |
1 files changed, 31 insertions, 3 deletions
diff --git a/src/libcamera/sensor/camera_sensor.cpp b/src/libcamera/sensor/camera_sensor.cpp index 7abbe2c7..e7b526c2 100644 --- a/src/libcamera/sensor/camera_sensor.cpp +++ b/src/libcamera/sensor/camera_sensor.cpp @@ -348,11 +348,13 @@ CameraSensor::~CameraSensor() = default; /** * \brief Construct a camera sensor factory base + * \param[in] priority Priority order for factory selection * * Creating an instance of the factory base registers it with the global list of * factories, accessible through the factories() function. */ -CameraSensorFactoryBase::CameraSensorFactoryBase() +CameraSensorFactoryBase::CameraSensorFactoryBase(int priority) + : priority_(priority) { registerFactory(this); } @@ -361,6 +363,12 @@ CameraSensorFactoryBase::CameraSensorFactoryBase() * \brief Create an instance of the CameraSensor corresponding to a media entity * \param[in] entity The media entity on the source end of the sensor * + * When multiple factories match the same \a entity, this function selects the + * matching factory with the highest priority as specified to the + * REGISTER_CAMERA_SENSOR() macro at factory registration time. If multiple + * matching factories have the same highest priority value, which factory gets + * selected is undefined and may vary between runs. + * * \return A unique pointer to a new instance of the CameraSensor subclass * matching the entity, or a null pointer if no such factory exists */ @@ -388,7 +396,16 @@ std::unique_ptr<CameraSensor> CameraSensorFactoryBase::create(MediaEntity *entit } /** + * \fn CameraSensorFactoryBase::priority() + * \brief Retrieve the priority value for the factory + * \return The priority value for the factory + */ + +/** * \brief Retrieve the list of all camera sensor factories + * + * The factories are sorted in decreasing priority order. + * * \return The list of camera sensor factories */ std::vector<CameraSensorFactoryBase *> &CameraSensorFactoryBase::factories() @@ -411,7 +428,12 @@ void CameraSensorFactoryBase::registerFactory(CameraSensorFactoryBase *factory) std::vector<CameraSensorFactoryBase *> &factories = CameraSensorFactoryBase::factories(); - factories.push_back(factory); + auto pos = std::upper_bound(factories.begin(), factories.end(), factory, + [](const CameraSensorFactoryBase *value, + const CameraSensorFactoryBase *elem) { + return value->priority() > elem->priority(); + }); + factories.insert(pos, factory); } /** @@ -437,9 +459,10 @@ void CameraSensorFactoryBase::registerFactory(CameraSensorFactoryBase *factory) */ /** - * \def REGISTER_CAMERA_SENSOR(sensor) + * \def REGISTER_CAMERA_SENSOR(sensor, priority) * \brief Register a camera sensor type to the sensor factory * \param[in] sensor Class name of the CameraSensor derived class to register + * \param[in] priority Priority order for factory selection * * Register a CameraSensor subclass with the factory and make it available to * try and match sensors. The subclass needs to implement a static match @@ -457,6 +480,11 @@ void CameraSensorFactoryBase::registerFactory(CameraSensorFactoryBase *factory) * creation succeeded ; * - A non-zero error code if the entity matched and the creation failed ; or * - A zero error code if the entity didn't match. + * + * When multiple factories can support the same MediaEntity (as in the match() + * function of multiple factories returning true for the same entity), the \a + * priority argument selects which factory will be used. See + * CameraSensorFactoryBase::create() for more information. */ } /* namespace libcamera */ |