Tuner service and getFrontendIds

Test: mmm; cuttlefish with tuner sample input
Change-Id: I0397c79ccf331950401e2a438f4acc48a41cc3dd
diff --git a/services/tuner/TunerService.cpp b/services/tuner/TunerService.cpp
new file mode 100644
index 0000000..92008a9
--- /dev/null
+++ b/services/tuner/TunerService.cpp
@@ -0,0 +1,65 @@
+/**
+ * Copyright (c) 2020, 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.
+ */
+
+#define LOG_TAG "TunerService"
+
+#include <android/binder_manager.h>
+#include <utils/Log.h>
+#include "TunerService.h"
+
+using ::android::hardware::hidl_vec;
+using ::android::hardware::tv::tuner::V1_0::FrontendId;
+using ::android::hardware::tv::tuner::V1_0::Result;
+
+namespace android {
+
+sp<ITuner> TunerService::mTuner;
+
+TunerService::TunerService() {}
+TunerService::~TunerService() {}
+
+void TunerService::instantiate() {
+    std::shared_ptr<TunerService> service =
+            ::ndk::SharedRefBase::make<TunerService>();
+    AServiceManager_addService(service->asBinder().get(), getServiceName());
+}
+
+Status TunerService::getFrontendIds(std::vector<int32_t>* ids, int32_t* /* _aidl_return */) {
+    if (mTuner == nullptr) {
+        // TODO: create a method for init.
+        mTuner = ITuner::getService();
+        if (mTuner == nullptr) {
+            ALOGE("Failed to get ITuner service.");
+            return ::ndk::ScopedAStatus::fromServiceSpecificError(
+                    static_cast<int32_t>(Result::UNAVAILABLE));
+        }
+    }
+    hidl_vec<FrontendId> feIds;
+    Result res;
+    mTuner->getFrontendIds([&](Result r, const hidl_vec<FrontendId>& frontendIds) {
+        feIds = frontendIds;
+        res = r;
+    });
+    if (res != Result::SUCCESS) {
+        return ::ndk::ScopedAStatus::fromServiceSpecificError(static_cast<int32_t>(res));
+    }
+    ids->resize(feIds.size());
+    std::copy(feIds.begin(), feIds.end(), ids->begin());
+
+    return ::ndk::ScopedAStatus::ok();
+}
+
+} // namespace android