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-rw-r--r--src/libcamera/camera_manager.cpp97
1 files changed, 91 insertions, 6 deletions
diff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp
index 5fc1bba9..fddf7349 100644
--- a/src/libcamera/camera_manager.cpp
+++ b/src/libcamera/camera_manager.cpp
@@ -7,6 +7,7 @@
#include <libcamera/camera_manager.h>
+#include <condition_variable>
#include <map>
#include <libcamera/camera.h>
@@ -28,34 +29,93 @@ namespace libcamera {
LOG_DEFINE_CATEGORY(Camera)
-class CameraManager::Private
+class CameraManager::Private : public Thread
{
public:
Private(CameraManager *cm);
int start();
- void stop();
-
void addCamera(std::shared_ptr<Camera> &camera, dev_t devnum);
void removeCamera(Camera *camera);
+ /*
+ * This mutex protects
+ *
+ * - initialized_ and status_ during initialization
+ * - cameras_ and camerasByDevnum_ after initialization
+ */
+ Mutex mutex_;
std::vector<std::shared_ptr<Camera>> cameras_;
std::map<dev_t, std::weak_ptr<Camera>> camerasByDevnum_;
+protected:
+ void run() override;
+
private:
+ int init();
+ void cleanup();
+
CameraManager *cm_;
+ std::condition_variable cv_;
+ bool initialized_;
+ int status_;
+
std::vector<std::shared_ptr<PipelineHandler>> pipes_;
std::unique_ptr<DeviceEnumerator> enumerator_;
};
CameraManager::Private::Private(CameraManager *cm)
- : cm_(cm)
+ : cm_(cm), initialized_(false)
{
}
int CameraManager::Private::start()
{
+ int status;
+
+ /* Start the thread and wait for initialization to complete. */
+ Thread::start();
+
+ {
+ MutexLocker locker(mutex_);
+ cv_.wait(locker, [&] { return initialized_; });
+ status = status_;
+ }
+
+ /* If a failure happened during initialization, stop the thread. */
+ if (status < 0) {
+ exit();
+ wait();
+ return status;
+ }
+
+ return 0;
+}
+
+void CameraManager::Private::run()
+{
+ LOG(Camera, Debug) << "Starting camera manager";
+
+ int ret = init();
+
+ mutex_.lock();
+ status_ = ret;
+ initialized_ = true;
+ mutex_.unlock();
+ cv_.notify_one();
+
+ if (ret < 0)
+ return;
+
+ /* Now start processing events and messages. */
+ exec();
+
+ cleanup();
+}
+
+int CameraManager::Private::init()
+{
enumerator_ = DeviceEnumerator::create();
if (!enumerator_ || enumerator_->enumerate())
return -ENODEV;
@@ -89,7 +149,7 @@ int CameraManager::Private::start()
return 0;
}
-void CameraManager::Private::stop()
+void CameraManager::Private::cleanup()
{
/* TODO: unregister hot-plug callback here */
@@ -107,6 +167,8 @@ void CameraManager::Private::stop()
void CameraManager::Private::addCamera(std::shared_ptr<Camera> &camera,
dev_t devnum)
{
+ MutexLocker locker(mutex_);
+
for (std::shared_ptr<Camera> c : cameras_) {
if (c->name() == camera->name()) {
LOG(Camera, Warning)
@@ -126,6 +188,8 @@ void CameraManager::Private::addCamera(std::shared_ptr<Camera> &camera,
void CameraManager::Private::removeCamera(Camera *camera)
{
+ MutexLocker locker(mutex_);
+
auto iter = std::find_if(cameras_.begin(), cameras_.end(),
[camera](std::shared_ptr<Camera> &c) {
return c.get() == camera;
@@ -232,7 +296,8 @@ int CameraManager::start()
*/
void CameraManager::stop()
{
- p_->stop();
+ p_->exit();
+ p_->wait();
}
/**
@@ -242,10 +307,14 @@ void CameraManager::stop()
* Before calling this function the caller is responsible for ensuring that
* the camera manager is running.
*
+ * \context This function is \threadsafe.
+ *
* \return List of all available cameras
*/
std::vector<std::shared_ptr<Camera>> CameraManager::cameras() const
{
+ MutexLocker locker(p_->mutex_);
+
return p_->cameras_;
}
@@ -256,10 +325,14 @@ std::vector<std::shared_ptr<Camera>> CameraManager::cameras() const
* Before calling this function the caller is responsible for ensuring that
* the camera manager is running.
*
+ * \context This function is \threadsafe.
+ *
* \return Shared pointer to Camera object or nullptr if camera not found
*/
std::shared_ptr<Camera> CameraManager::get(const std::string &name)
{
+ MutexLocker locker(p_->mutex_);
+
for (std::shared_ptr<Camera> camera : p_->cameras_) {
if (camera->name() == name)
return camera;
@@ -279,11 +352,15 @@ std::shared_ptr<Camera> CameraManager::get(const std::string &name)
* Before calling this function the caller is responsible for ensuring that
* the camera manager is running.
*
+ * \context This function is \threadsafe.
+ *
* \return Shared pointer to Camera object, which is empty if the camera is
* not found
*/
std::shared_ptr<Camera> CameraManager::get(dev_t devnum)
{
+ MutexLocker locker(p_->mutex_);
+
auto iter = p_->camerasByDevnum_.find(devnum);
if (iter == p_->camerasByDevnum_.end())
return nullptr;
@@ -302,9 +379,12 @@ std::shared_ptr<Camera> CameraManager::get(dev_t devnum)
*
* \a devnum is used by the V4L2 compatibility layer to map V4L2 device nodes
* to Camera instances.
+ *
+ * \context This function shall be called from the CameraManager thread.
*/
void CameraManager::addCamera(std::shared_ptr<Camera> camera, dev_t devnum)
{
+ ASSERT(Thread::current() == p_.get());
p_->addCamera(camera, devnum);
}
@@ -316,15 +396,20 @@ void CameraManager::addCamera(std::shared_ptr<Camera> camera, dev_t devnum)
* This function is called by pipeline handlers to unregister cameras from the
* camera manager. Unregistered cameras won't be reported anymore by the
* cameras() and get() calls, but references may still exist in applications.
+ *
+ * \context This function shall be called from the CameraManager thread.
*/
void CameraManager::removeCamera(Camera *camera)
{
+ ASSERT(Thread::current() == p_.get());
+
p_->removeCamera(camera);
}
/**
* \fn const std::string &CameraManager::version()
* \brief Retrieve the libcamera version string
+ * \context This function is \a threadsafe.
* \return The libcamera version string
*/