e1857f8dbd
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
117 lines
4.7 KiB
C++
117 lines
4.7 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef HARDWARE_INTERFACES_CAMERA_PROVIDER_DEFAULT_EXTERNALCAMERAPROVIDER_H_
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#define HARDWARE_INTERFACES_CAMERA_PROVIDER_DEFAULT_EXTERNALCAMERAPROVIDER_H_
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#include <ExternalCameraUtils.h>
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#include <SimpleThread.h>
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#include <aidl/android/hardware/camera/common/CameraDeviceStatus.h>
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#include <aidl/android/hardware/camera/common/VendorTagSection.h>
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#include <aidl/android/hardware/camera/device/ICameraDevice.h>
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#include <aidl/android/hardware/camera/provider/BnCameraProvider.h>
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#include <aidl/android/hardware/camera/provider/CameraIdAndStreamCombination.h>
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#include <aidl/android/hardware/camera/provider/ConcurrentCameraIdCombination.h>
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#include <aidl/android/hardware/camera/provider/ICameraProviderCallback.h>
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#include <poll.h>
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#include <utils/Mutex.h>
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#include <utils/Thread.h>
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#include <thread>
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#include <unordered_map>
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#include <unordered_set>
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namespace android {
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namespace hardware {
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namespace camera {
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namespace provider {
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namespace implementation {
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using ::aidl::android::hardware::camera::common::CameraDeviceStatus;
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using ::aidl::android::hardware::camera::common::VendorTagSection;
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using ::aidl::android::hardware::camera::device::ICameraDevice;
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using ::aidl::android::hardware::camera::provider::BnCameraProvider;
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using ::aidl::android::hardware::camera::provider::CameraIdAndStreamCombination;
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using ::aidl::android::hardware::camera::provider::ConcurrentCameraIdCombination;
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using ::aidl::android::hardware::camera::provider::ICameraProviderCallback;
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using ::android::hardware::camera::common::helper::SimpleThread;
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using ::android::hardware::camera::external::common::ExternalCameraConfig;
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class ExternalCameraProvider : public BnCameraProvider {
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public:
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ExternalCameraProvider();
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~ExternalCameraProvider() override;
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ndk::ScopedAStatus setCallback(
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const std::shared_ptr<ICameraProviderCallback>& in_callback) override;
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ndk::ScopedAStatus getVendorTags(std::vector<VendorTagSection>* _aidl_return) override;
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ndk::ScopedAStatus getCameraIdList(std::vector<std::string>* _aidl_return) override;
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ndk::ScopedAStatus getCameraDeviceInterface(
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const std::string& in_cameraDeviceName,
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std::shared_ptr<ICameraDevice>* _aidl_return) override;
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ndk::ScopedAStatus notifyDeviceStateChange(int64_t in_deviceState) override;
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ndk::ScopedAStatus getConcurrentCameraIds(
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std::vector<ConcurrentCameraIdCombination>* _aidl_return) override;
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ndk::ScopedAStatus isConcurrentStreamCombinationSupported(
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const std::vector<CameraIdAndStreamCombination>& in_configs,
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bool* _aidl_return) override;
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private:
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void addExternalCamera(const char* devName);
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void deviceAdded(const char* devName);
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void deviceRemoved(const char* devName);
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void updateAttachedCameras();
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// A separate thread to monitor '/dev' directory for '/dev/video*' entries
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// This thread calls back into ExternalCameraProvider when an actionable change is detected.
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class HotplugThread : public SimpleThread {
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public:
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explicit HotplugThread(ExternalCameraProvider* parent);
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~HotplugThread() override;
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protected:
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bool threadLoop() override;
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private:
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// Returns true if thread initialization succeeded, and false if thread initialization
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// failed.
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bool initialize();
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ExternalCameraProvider* mParent = nullptr;
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const std::unordered_set<std::string> mInternalDevices;
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bool mIsInitialized = false;
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int mINotifyFD = -1;
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int mWd = -1;
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// struct to wrap mINotifyFD and poll it with timeout
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struct pollfd mPollFd = {};
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char mEventBuf[512] = {0};
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};
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Mutex mLock;
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std::shared_ptr<ICameraProviderCallback> mCallback = nullptr;
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std::unordered_map<std::string, CameraDeviceStatus> mCameraStatusMap; // camera id -> status
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const ExternalCameraConfig mCfg;
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std::shared_ptr<HotplugThread> mHotPlugThread;
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};
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} // namespace implementation
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} // namespace provider
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} // namespace camera
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} // namespace hardware
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} // namespace android
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#endif // HARDWARE_INTERFACES_CAMERA_PROVIDER_DEFAULT_EXTERNALCAMERAPROVIDER_H_
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