summaryrefslogtreecommitdiff
path: root/src/android/camera_hal_manager.cpp
diff options
context:
space:
mode:
authorJacopo Mondi <jacopo@jmondi.org>2019-05-10 17:40:02 +0200
committerJacopo Mondi <jacopo@jmondi.org>2019-08-12 11:55:46 +0200
commit667d8ea8fd4bda35e8888792d2b6c055fdb4be18 (patch)
tree786462c9f8dfce3d3d05d69dc8befcd67e94db07 /src/android/camera_hal_manager.cpp
parent6bed34da161bb8c4e86821116dcff2205e29c58a (diff)
android: hal: Add Camera3 HAL
Add libcamera Android Camera HALv3 implementation. The initial camera HAL implementation supports the LIMITED hardware level and uses statically defined metadata and camera characteristics. Add a build option named 'android' and adjust the build system to selectively compile the Android camera HAL and link it against the required Android libraries. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Diffstat (limited to 'src/android/camera_hal_manager.cpp')
-rw-r--r--src/android/camera_hal_manager.cpp138
1 files changed, 138 insertions, 0 deletions
diff --git a/src/android/camera_hal_manager.cpp b/src/android/camera_hal_manager.cpp
new file mode 100644
index 00000000..08c759df
--- /dev/null
+++ b/src/android/camera_hal_manager.cpp
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_hal_manager.cpp - libcamera Android Camera Manager
+ */
+
+#include "camera_hal_manager.h"
+
+#include <libcamera/camera.h>
+
+#include "log.h"
+
+#include "camera_device.h"
+#include "camera_proxy.h"
+
+using namespace libcamera;
+
+LOG_DECLARE_CATEGORY(HAL);
+
+/*
+ * \class CameraHalManager
+ *
+ * The HAL camera manager is initializated at camera_module_t 'hal_init()' time
+ * and spawns its own thread where libcamera related events are dispatched to.
+ * It wraps the libcamera CameraManager operations and provides helpers for the
+ * camera_module_t operations, to retrieve the number of cameras in the system,
+ * their static information and to open and close camera devices.
+ */
+
+int CameraHalManager::init()
+{
+ /*
+ * Start the camera HAL manager thread and wait until its
+ * initialisation completes to be fully operational before
+ * receiving calls from the camera stack.
+ */
+ start();
+
+ MutexLocker locker(mutex_);
+ cv_.wait(locker);
+
+ return 0;
+}
+
+void CameraHalManager::run()
+{
+ /*
+ * All the libcamera components must be initialised here, in
+ * order to bind them to the camera HAL manager thread that
+ * executes the event dispatcher.
+ */
+ cameraManager_ = libcamera::CameraManager::instance();
+
+ int ret = cameraManager_->start();
+ if (ret) {
+ LOG(HAL, Error) << "Failed to start camera manager: "
+ << strerror(-ret);
+ return;
+ }
+
+ /*
+ * For each Camera registered in the system, a CameraProxy
+ * gets created here to wraps a camera device.
+ *
+ * \todo Support camera hotplug.
+ */
+ unsigned int index = 0;
+ for (auto &camera : cameraManager_->cameras()) {
+ CameraProxy *proxy = new CameraProxy(index, camera);
+ proxies_.emplace_back(proxy);
+
+ ++index;
+ }
+
+ /*
+ * libcamera has been initialized. Unlock the init() caller
+ * as we're now ready to handle calls from the framework.
+ */
+ cv_.notify_one();
+
+ /* Now start processing events and messages. */
+ exec();
+}
+
+CameraProxy *CameraHalManager::open(unsigned int id,
+ const hw_module_t *hardwareModule)
+{
+ if (id < 0 || id >= numCameras()) {
+ LOG(HAL, Error) << "Invalid camera id '" << id << "'";
+ return nullptr;
+ }
+
+ CameraProxy *proxy = proxies_[id].get();
+ if (proxy->open(hardwareModule))
+ return nullptr;
+
+ LOG(HAL, Info) << "Open camera '" << id << "'";
+
+ return proxy;
+}
+
+int CameraHalManager::close(CameraProxy *proxy)
+{
+ proxy->close();
+ LOG(HAL, Info) << "Close camera '" << proxy->id() << "'";
+
+ return 0;
+}
+
+unsigned int CameraHalManager::numCameras() const
+{
+ return cameraManager_->cameras().size();
+}
+
+int CameraHalManager::getCameraInfo(int id, struct camera_info *info)
+{
+ if (!info)
+ return -EINVAL;
+
+ if (id >= numCameras() || id < 0) {
+ LOG(HAL, Error) << "Invalid camera id '" << id << "'";
+ return -EINVAL;
+ }
+
+ CameraProxy *proxy = proxies_[id].get();
+
+ /* \todo Get these info dynamically inspecting the camera module. */
+ info->facing = id ? CAMERA_FACING_FRONT : CAMERA_FACING_BACK;
+ info->orientation = 0;
+ info->device_version = 0;
+ info->resource_cost = 0;
+ info->static_camera_characteristics = proxy->getStaticMetadata();
+ info->conflicting_devices = nullptr;
+ info->conflicting_devices_length = 0;
+
+ return 0;
+}