Migrate reference external HAL implementation to AIDL
Android T migrated the HAL interface to AIDL, but the reference HAL
was never updated to use AIDL. This CL migrates the reference
HAL implementation for external cameras to use AIDL as well. The
external HAL uses V4L2 standard to expose USB cameras to the
cameraserver.
The reference HAL implementation for internal camera was dropped
because it is not possible to write a generic HAL that works with some
large percentage of internal cameras.
Bug: 219974678
Test: Existing CTS tests pass with external camera connected.
Change-Id: I35f3dc32c16670eca7735a4ac00fed3daf36aa65
diff --git a/camera/provider/default/external-service.cpp b/camera/provider/default/external-service.cpp
new file mode 100644
index 0000000..b18f182
--- /dev/null
+++ b/camera/provider/default/external-service.cpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ExternalCameraProvider.h>
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using ::android::hardware::camera::provider::implementation::ExternalCameraProvider;
+
+namespace {
+// Default recommended RPC thread count for camera provider implementations
+const int HWBINDER_THREAD_COUNT = 6;
+} // namespace
+
+int main() {
+ ALOGI("CameraProvider: external webcam service is starting.");
+
+ ABinderProcess_setThreadPoolMaxThreadCount(HWBINDER_THREAD_COUNT);
+
+ std::shared_ptr<ExternalCameraProvider> defaultProvider =
+ ndk::SharedRefBase::make<ExternalCameraProvider>();
+ const std::string serviceName = std::string(ExternalCameraProvider::descriptor) + "/external/0";
+
+#ifdef LAZY_SERVICE
+ binder_exception_t ret = AServiceManager_registerLazyService(defaultProvider->asBinder().get(),
+ serviceName.c_str());
+ LOG_ALWAYS_FATAL_IF(ret != EX_NONE,
+ "Error while registering lazy ext camera provider service: %d", ret);
+#else
+ binder_exception_t ret =
+ AServiceManager_addService(defaultProvider->asBinder().get(), serviceName.c_str());
+ LOG_ALWAYS_FATAL_IF(ret != EX_NONE, "Error while registering ext camera provider service: %d",
+ ret);
+#endif
+
+ ABinderProcess_joinThreadPool();
+ return EXIT_FAILURE; // should not reach
+}
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