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/Android.bp b/camera/provider/default/Android.bp
new file mode 100644
index 0000000..ed45cbe
--- /dev/null
+++ b/camera/provider/default/Android.bp
@@ -0,0 +1,104 @@
+//
+// 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.
+//
+
+package {
+ // See: http://go/android-license-faq
+ // A large-scale-change added 'default_applicable_licenses' to import
+ // all of the 'license_kinds' from "hardware_interfaces_license"
+ // to get the below license kinds:
+ // SPDX-license-identifier-Apache-2.0
+ default_applicable_licenses: ["hardware_interfaces_license"],
+}
+
+cc_library_shared {
+ name: "android.hardware.camera.provider-V1-external-impl",
+ defaults: ["hidl_defaults"],
+ proprietary: true,
+ srcs: [
+ "ExternalCameraProvider.cpp",
+ ],
+ shared_libs: [
+ "android.hardware.camera.common-V1-ndk",
+ "android.hardware.camera.device-V1-ndk",
+ "android.hardware.camera.provider-V1-ndk",
+ "android.hardware.graphics.mapper@2.0",
+ "android.hardware.graphics.mapper@3.0",
+ "android.hardware.graphics.mapper@4.0",
+ "android.hidl.allocator@1.0",
+ "android.hidl.memory@1.0",
+ "camera.device-external-impl",
+ "libbinder_ndk",
+ "libcamera_metadata",
+ "libcutils",
+ "libfmq",
+ "libhardware",
+ "libhidlbase",
+ "liblog",
+ "libtinyxml2",
+ "libutils",
+ ],
+ static_libs: [
+ "android.hardware.camera.common@1.0-helper",
+ ],
+ export_include_dirs: ["."],
+}
+
+cc_defaults {
+ name: "camera_external_service_defaults",
+ defaults: ["hidl_defaults"],
+ proprietary: true,
+ relative_install_path: "hw",
+ srcs: ["external-service.cpp"],
+ compile_multilib: "first",
+ shared_libs: [
+ "android.hardware.camera.common-V1-ndk",
+ "android.hardware.camera.device-V1-ndk",
+ "android.hardware.camera.provider-V1-ndk",
+ "android.hardware.camera.provider-V1-external-impl",
+ "android.hardware.graphics.mapper@2.0",
+ "android.hardware.graphics.mapper@3.0",
+ "android.hardware.graphics.mapper@4.0",
+ "android.hidl.allocator@1.0",
+ "android.hidl.memory@1.0",
+ "camera.device-external-impl",
+ "libbinder_ndk",
+ "libcamera_metadata",
+ "libcutils",
+ "libfmq",
+ "libhardware",
+ "libhidlbase",
+ "liblog",
+ "libtinyxml2",
+ "libutils",
+ ],
+ static_libs: [
+ "android.hardware.camera.common@1.0-helper",
+ ],
+}
+
+cc_binary {
+ name: "android.hardware.camera.provider-V1-external-service",
+ defaults: ["camera_external_service_defaults"],
+ init_rc: ["android.hardware.camera.provider-V1-external-service.rc"],
+}
+
+cc_binary {
+ name: "android.hardware.camera.provider-V1-external-service-lazy",
+ overrides: ["android.hardware.camera.provider-V1-external-service"],
+ defaults: ["camera_external_service_defaults"],
+ init_rc: ["android.hardware.camera.provider-V1-external-service-lazy.rc"],
+ cflags: ["-DLAZY_SERVICE"],
+}
diff --git a/camera/provider/default/ExternalCameraProvider.cpp b/camera/provider/default/ExternalCameraProvider.cpp
new file mode 100644
index 0000000..d47ddbf
--- /dev/null
+++ b/camera/provider/default/ExternalCameraProvider.cpp
@@ -0,0 +1,382 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "ExtCamPrvdr"
+// #define LOG_NDEBUG 0
+
+#include "ExternalCameraProvider.h"
+
+#include <ExternalCameraDevice.h>
+#include <aidl/android/hardware/camera/common/Status.h>
+#include <convert.h>
+#include <cutils/properties.h>
+#include <linux/videodev2.h>
+#include <log/log.h>
+#include <sys/inotify.h>
+#include <regex>
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace provider {
+namespace implementation {
+
+using ::aidl::android::hardware::camera::common::Status;
+using ::android::hardware::camera::device::implementation::ExternalCameraDevice;
+using ::android::hardware::camera::device::implementation::fromStatus;
+using ::android::hardware::camera::external::common::ExternalCameraConfig;
+
+namespace {
+// "device@<version>/external/<id>"
+const std::regex kDeviceNameRE("device@([0-9]+\\.[0-9]+)/external/(.+)");
+const int kMaxDevicePathLen = 256;
+constexpr char kDevicePath[] = "/dev/";
+constexpr char kPrefix[] = "video";
+constexpr int kPrefixLen = sizeof(kPrefix) - 1;
+constexpr int kDevicePrefixLen = sizeof(kDevicePath) + kPrefixLen + 1;
+
+bool matchDeviceName(int cameraIdOffset, const std::string& deviceName, std::string* deviceVersion,
+ std::string* cameraDevicePath) {
+ std::smatch sm;
+ if (std::regex_match(deviceName, sm, kDeviceNameRE)) {
+ if (deviceVersion != nullptr) {
+ *deviceVersion = sm[1];
+ }
+ if (cameraDevicePath != nullptr) {
+ *cameraDevicePath = "/dev/video" + std::to_string(std::stoi(sm[2]) - cameraIdOffset);
+ }
+ return true;
+ }
+ return false;
+}
+} // namespace
+
+ExternalCameraProvider::ExternalCameraProvider() : mCfg(ExternalCameraConfig::loadFromCfg()) {
+ mHotPlugThread = std::make_shared<HotplugThread>(this);
+ mHotPlugThread->run();
+}
+
+ExternalCameraProvider::~ExternalCameraProvider() {
+ mHotPlugThread->requestExitAndWait();
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::setCallback(
+ const std::shared_ptr<ICameraProviderCallback>& in_callback) {
+ {
+ Mutex::Autolock _l(mLock);
+ mCallback = in_callback;
+ }
+
+ if (mCallback == nullptr) {
+ return fromStatus(Status::OK);
+ }
+
+ for (const auto& pair : mCameraStatusMap) {
+ mCallback->cameraDeviceStatusChange(pair.first, pair.second);
+ }
+ return fromStatus(Status::OK);
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::getVendorTags(
+ std::vector<VendorTagSection>* _aidl_return) {
+ if (_aidl_return == nullptr) {
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+ // No vendor tag support for USB camera
+ *_aidl_return = {};
+ return fromStatus(Status::OK);
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::getCameraIdList(std::vector<std::string>* _aidl_return) {
+ if (_aidl_return == nullptr) {
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+ // External camera HAL always report 0 camera, and extra cameras
+ // are just reported via cameraDeviceStatusChange callbacks
+ *_aidl_return = {};
+ return fromStatus(Status::OK);
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::getCameraDeviceInterface(
+ const std::string& in_cameraDeviceName, std::shared_ptr<ICameraDevice>* _aidl_return) {
+ if (_aidl_return == nullptr) {
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+ std::string cameraDevicePath, deviceVersion;
+ bool match = matchDeviceName(mCfg.cameraIdOffset, in_cameraDeviceName, &deviceVersion,
+ &cameraDevicePath);
+
+ if (!match) {
+ *_aidl_return = nullptr;
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+
+ if (mCameraStatusMap.count(in_cameraDeviceName) == 0 ||
+ mCameraStatusMap[in_cameraDeviceName] != CameraDeviceStatus::PRESENT) {
+ *_aidl_return = nullptr;
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+
+ ALOGV("Constructing external camera device");
+ std::shared_ptr<ExternalCameraDevice> deviceImpl =
+ ndk::SharedRefBase::make<ExternalCameraDevice>(cameraDevicePath, mCfg);
+ if (deviceImpl == nullptr || deviceImpl->isInitFailed()) {
+ ALOGE("%s: camera device %s init failed!", __FUNCTION__, cameraDevicePath.c_str());
+ *_aidl_return = nullptr;
+ return fromStatus(Status::INTERNAL_ERROR);
+ }
+
+ IF_ALOGV() {
+ int interfaceVersion;
+ deviceImpl->getInterfaceVersion(&interfaceVersion);
+ ALOGV("%s: device interface version: %d", __FUNCTION__, interfaceVersion);
+ }
+
+ *_aidl_return = deviceImpl;
+ return fromStatus(Status::OK);
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::notifyDeviceStateChange(int64_t) {
+ return fromStatus(Status::OK);
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::getConcurrentCameraIds(
+ std::vector<ConcurrentCameraIdCombination>* _aidl_return) {
+ if (_aidl_return == nullptr) {
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+ *_aidl_return = {};
+ return fromStatus(Status::OK);
+}
+
+ndk::ScopedAStatus ExternalCameraProvider::isConcurrentStreamCombinationSupported(
+ const std::vector<CameraIdAndStreamCombination>&, bool* _aidl_return) {
+ if (_aidl_return == nullptr) {
+ return fromStatus(Status::ILLEGAL_ARGUMENT);
+ }
+ // No concurrent stream combinations are supported
+ *_aidl_return = false;
+ return fromStatus(Status::OK);
+}
+
+void ExternalCameraProvider::addExternalCamera(const char* devName) {
+ ALOGV("%s: ExtCam: adding %s to External Camera HAL!", __FUNCTION__, devName);
+ Mutex::Autolock _l(mLock);
+ std::string deviceName;
+ std::string cameraId =
+ std::to_string(mCfg.cameraIdOffset + std::atoi(devName + kDevicePrefixLen));
+ deviceName =
+ std::string("device@") + ExternalCameraDevice::kDeviceVersion + "/external/" + cameraId;
+ mCameraStatusMap[deviceName] = CameraDeviceStatus::PRESENT;
+ if (mCallback != nullptr) {
+ mCallback->cameraDeviceStatusChange(deviceName, CameraDeviceStatus::PRESENT);
+ }
+}
+
+void ExternalCameraProvider::deviceAdded(const char* devName) {
+ {
+ base::unique_fd fd(::open(devName, O_RDWR));
+ if (fd.get() < 0) {
+ ALOGE("%s open v4l2 device %s failed:%s", __FUNCTION__, devName, strerror(errno));
+ return;
+ }
+
+ struct v4l2_capability capability;
+ int ret = ioctl(fd.get(), VIDIOC_QUERYCAP, &capability);
+ if (ret < 0) {
+ ALOGE("%s v4l2 QUERYCAP %s failed", __FUNCTION__, devName);
+ return;
+ }
+
+ if (!(capability.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
+ ALOGW("%s device %s does not support VIDEO_CAPTURE", __FUNCTION__, devName);
+ return;
+ }
+ }
+
+ // See if we can initialize ExternalCameraDevice correctly
+ std::shared_ptr<ExternalCameraDevice> deviceImpl =
+ ndk::SharedRefBase::make<ExternalCameraDevice>(devName, mCfg);
+ if (deviceImpl == nullptr || deviceImpl->isInitFailed()) {
+ ALOGW("%s: Attempt to init camera device %s failed!", __FUNCTION__, devName);
+ return;
+ }
+ deviceImpl.reset();
+ addExternalCamera(devName);
+}
+
+void ExternalCameraProvider::deviceRemoved(const char* devName) {
+ Mutex::Autolock _l(mLock);
+ std::string deviceName;
+ std::string cameraId =
+ std::to_string(mCfg.cameraIdOffset + std::atoi(devName + kDevicePrefixLen));
+
+ deviceName =
+ std::string("device@") + ExternalCameraDevice::kDeviceVersion + "/external/" + cameraId;
+
+ if (mCameraStatusMap.erase(deviceName) == 0) {
+ // Unknown device, do not fire callback
+ ALOGE("%s: cannot find camera device to remove %s", __FUNCTION__, devName);
+ return;
+ }
+
+ if (mCallback != nullptr) {
+ mCallback->cameraDeviceStatusChange(deviceName, CameraDeviceStatus::NOT_PRESENT);
+ }
+}
+
+void ExternalCameraProvider::updateAttachedCameras() {
+ ALOGV("%s start scanning for existing V4L2 devices", __FUNCTION__);
+
+ // Find existing /dev/video* devices
+ DIR* devdir = opendir(kDevicePath);
+ if (devdir == nullptr) {
+ ALOGE("%s: cannot open %s! Exiting threadloop", __FUNCTION__, kDevicePath);
+ return;
+ }
+
+ struct dirent* de;
+ while ((de = readdir(devdir)) != nullptr) {
+ // Find external v4l devices that's existing before we start watching and add them
+ if (!strncmp(kPrefix, de->d_name, kPrefixLen)) {
+ std::string deviceId(de->d_name + kPrefixLen);
+ if (mCfg.mInternalDevices.count(deviceId) == 0) {
+ ALOGV("Non-internal v4l device %s found", de->d_name);
+ char v4l2DevicePath[kMaxDevicePathLen];
+ snprintf(v4l2DevicePath, kMaxDevicePathLen, "%s%s", kDevicePath, de->d_name);
+ deviceAdded(v4l2DevicePath);
+ }
+ }
+ }
+ closedir(devdir);
+}
+
+// Start ExternalCameraProvider::HotplugThread functions
+
+ExternalCameraProvider::HotplugThread::HotplugThread(ExternalCameraProvider* parent)
+ : mParent(parent), mInternalDevices(parent->mCfg.mInternalDevices) {}
+
+ExternalCameraProvider::HotplugThread::~HotplugThread() {
+ // Clean up inotify descriptor if needed.
+ if (mINotifyFD >= 0) {
+ close(mINotifyFD);
+ }
+}
+
+bool ExternalCameraProvider::HotplugThread::initialize() {
+ // Update existing cameras
+ mParent->updateAttachedCameras();
+
+ // Set up non-blocking fd. The threadLoop will be responsible for polling read at the
+ // desired frequency
+ mINotifyFD = inotify_init();
+ if (mINotifyFD < 0) {
+ ALOGE("%s: inotify init failed! Exiting threadloop", __FUNCTION__);
+ return false;
+ }
+
+ // Start watching /dev/ directory for created and deleted files
+ mWd = inotify_add_watch(mINotifyFD, kDevicePath, IN_CREATE | IN_DELETE);
+ if (mWd < 0) {
+ ALOGE("%s: inotify add watch failed! Exiting threadloop", __FUNCTION__);
+ return false;
+ }
+
+ mPollFd = {.fd = mINotifyFD, .events = POLLIN};
+
+ mIsInitialized = true;
+ return true;
+}
+
+bool ExternalCameraProvider::HotplugThread::threadLoop() {
+ // Initialize inotify descriptors if needed.
+ if (!mIsInitialized && !initialize()) {
+ return true;
+ }
+
+ // poll /dev/* and handle timeouts and error
+ int pollRet = poll(&mPollFd, /* fd_count= */ 1, /* timeout= */ 250);
+ if (pollRet == 0) {
+ // no read event in 100ms
+ mPollFd.revents = 0;
+ return true;
+ } else if (pollRet < 0) {
+ ALOGE("%s: error while polling for /dev/*: %d", __FUNCTION__, errno);
+ mPollFd.revents = 0;
+ return true;
+ } else if (mPollFd.revents & POLLERR) {
+ ALOGE("%s: polling /dev/ returned POLLERR", __FUNCTION__);
+ mPollFd.revents = 0;
+ return true;
+ } else if (mPollFd.revents & POLLHUP) {
+ ALOGE("%s: polling /dev/ returned POLLHUP", __FUNCTION__);
+ mPollFd.revents = 0;
+ return true;
+ } else if (mPollFd.revents & POLLNVAL) {
+ ALOGE("%s: polling /dev/ returned POLLNVAL", __FUNCTION__);
+ mPollFd.revents = 0;
+ return true;
+ }
+ // mPollFd.revents must contain POLLIN, so safe to reset it before reading
+ mPollFd.revents = 0;
+
+ uint64_t offset = 0;
+ ssize_t ret = read(mINotifyFD, mEventBuf, sizeof(mEventBuf));
+ if (ret < sizeof(struct inotify_event)) {
+ // invalid event. skip
+ return true;
+ }
+
+ while (offset < ret) {
+ struct inotify_event* event = (struct inotify_event*)&mEventBuf[offset];
+ offset += sizeof(struct inotify_event) + event->len;
+
+ if (event->wd != mWd) {
+ // event for an unrelated descriptor. ignore.
+ continue;
+ }
+
+ ALOGV("%s inotify_event %s", __FUNCTION__, event->name);
+ if (strncmp(kPrefix, event->name, kPrefixLen) != 0) {
+ // event not for /dev/video*. ignore.
+ continue;
+ }
+
+ std::string deviceId = event->name + kPrefixLen;
+ if (mInternalDevices.count(deviceId) != 0) {
+ // update to an internal device. ignore.
+ continue;
+ }
+
+ char v4l2DevicePath[kMaxDevicePathLen];
+ snprintf(v4l2DevicePath, kMaxDevicePathLen, "%s%s", kDevicePath, event->name);
+
+ if (event->mask & IN_CREATE) {
+ mParent->deviceAdded(v4l2DevicePath);
+ } else if (event->mask & IN_DELETE) {
+ mParent->deviceRemoved(v4l2DevicePath);
+ }
+ }
+ return true;
+}
+
+// End ExternalCameraProvider::HotplugThread functions
+
+} // namespace implementation
+} // namespace provider
+} // namespace camera
+} // namespace hardware
+} // namespace android
\ No newline at end of file
diff --git a/camera/provider/default/ExternalCameraProvider.h b/camera/provider/default/ExternalCameraProvider.h
new file mode 100644
index 0000000..347a53c
--- /dev/null
+++ b/camera/provider/default/ExternalCameraProvider.h
@@ -0,0 +1,117 @@
+/*
+ * 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.
+ */
+
+#ifndef HARDWARE_INTERFACES_CAMERA_PROVIDER_DEFAULT_EXTERNALCAMERAPROVIDER_H_
+#define HARDWARE_INTERFACES_CAMERA_PROVIDER_DEFAULT_EXTERNALCAMERAPROVIDER_H_
+
+#include <ExternalCameraUtils.h>
+#include <SimpleThread.h>
+#include <aidl/android/hardware/camera/common/CameraDeviceStatus.h>
+#include <aidl/android/hardware/camera/common/VendorTagSection.h>
+#include <aidl/android/hardware/camera/device/ICameraDevice.h>
+#include <aidl/android/hardware/camera/provider/BnCameraProvider.h>
+#include <aidl/android/hardware/camera/provider/CameraIdAndStreamCombination.h>
+#include <aidl/android/hardware/camera/provider/ConcurrentCameraIdCombination.h>
+#include <aidl/android/hardware/camera/provider/ICameraProviderCallback.h>
+#include <poll.h>
+#include <utils/Mutex.h>
+#include <utils/Thread.h>
+#include <thread>
+#include <unordered_map>
+#include <unordered_set>
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace provider {
+namespace implementation {
+
+using ::aidl::android::hardware::camera::common::CameraDeviceStatus;
+using ::aidl::android::hardware::camera::common::VendorTagSection;
+using ::aidl::android::hardware::camera::device::ICameraDevice;
+using ::aidl::android::hardware::camera::provider::BnCameraProvider;
+using ::aidl::android::hardware::camera::provider::CameraIdAndStreamCombination;
+using ::aidl::android::hardware::camera::provider::ConcurrentCameraIdCombination;
+using ::aidl::android::hardware::camera::provider::ICameraProviderCallback;
+using ::android::hardware::camera::common::helper::SimpleThread;
+using ::android::hardware::camera::external::common::ExternalCameraConfig;
+
+class ExternalCameraProvider : public BnCameraProvider {
+ public:
+ ExternalCameraProvider();
+ ~ExternalCameraProvider() override;
+ ndk::ScopedAStatus setCallback(
+ const std::shared_ptr<ICameraProviderCallback>& in_callback) override;
+ ndk::ScopedAStatus getVendorTags(std::vector<VendorTagSection>* _aidl_return) override;
+ ndk::ScopedAStatus getCameraIdList(std::vector<std::string>* _aidl_return) override;
+ ndk::ScopedAStatus getCameraDeviceInterface(
+ const std::string& in_cameraDeviceName,
+ std::shared_ptr<ICameraDevice>* _aidl_return) override;
+ ndk::ScopedAStatus notifyDeviceStateChange(int64_t in_deviceState) override;
+ ndk::ScopedAStatus getConcurrentCameraIds(
+ std::vector<ConcurrentCameraIdCombination>* _aidl_return) override;
+ ndk::ScopedAStatus isConcurrentStreamCombinationSupported(
+ const std::vector<CameraIdAndStreamCombination>& in_configs,
+ bool* _aidl_return) override;
+
+ private:
+ void addExternalCamera(const char* devName);
+ void deviceAdded(const char* devName);
+ void deviceRemoved(const char* devName);
+ void updateAttachedCameras();
+
+ // A separate thread to monitor '/dev' directory for '/dev/video*' entries
+ // This thread calls back into ExternalCameraProvider when an actionable change is detected.
+ class HotplugThread : public SimpleThread {
+ public:
+ explicit HotplugThread(ExternalCameraProvider* parent);
+ ~HotplugThread() override;
+
+ protected:
+ bool threadLoop() override;
+
+ private:
+ // Returns true if thread initialization succeeded, and false if thread initialization
+ // failed.
+ bool initialize();
+
+ ExternalCameraProvider* mParent = nullptr;
+ const std::unordered_set<std::string> mInternalDevices;
+
+ bool mIsInitialized = false;
+
+ int mINotifyFD = -1;
+ int mWd = -1;
+
+ // struct to wrap mINotifyFD and poll it with timeout
+ struct pollfd mPollFd = {};
+ char mEventBuf[512] = {0};
+ };
+
+ Mutex mLock;
+ std::shared_ptr<ICameraProviderCallback> mCallback = nullptr;
+ std::unordered_map<std::string, CameraDeviceStatus> mCameraStatusMap; // camera id -> status
+ const ExternalCameraConfig mCfg;
+ std::shared_ptr<HotplugThread> mHotPlugThread;
+};
+
+} // namespace implementation
+} // namespace provider
+} // namespace camera
+} // namespace hardware
+} // namespace android
+
+#endif // HARDWARE_INTERFACES_CAMERA_PROVIDER_DEFAULT_EXTERNALCAMERAPROVIDER_H_
diff --git a/camera/provider/default/OWNERS b/camera/provider/default/OWNERS
new file mode 100644
index 0000000..f48a95c
--- /dev/null
+++ b/camera/provider/default/OWNERS
@@ -0,0 +1 @@
+include platform/frameworks/av:/camera/OWNERS
diff --git a/camera/provider/default/android.hardware.camera.provider-V1-external-service-lazy.rc b/camera/provider/default/android.hardware.camera.provider-V1-external-service-lazy.rc
new file mode 100644
index 0000000..dcdd88c
--- /dev/null
+++ b/camera/provider/default/android.hardware.camera.provider-V1-external-service-lazy.rc
@@ -0,0 +1,10 @@
+service vendor.camera.provider-ext /vendor/bin/hw/android.hardware.camera.provider-V1-external-service-lazy
+ interface aidl android.hardware.camera.provider.ICameraProvider/external/0
+ class hal
+ oneshot
+ disabled
+ user cameraserver
+ group audio camera input drmrpc usb
+ ioprio rt 4
+ capabilities SYS_NICE
+ task_profiles CameraServiceCapacity MaxPerformance
\ No newline at end of file
diff --git a/camera/provider/default/android.hardware.camera.provider-V1-external-service.rc b/camera/provider/default/android.hardware.camera.provider-V1-external-service.rc
new file mode 100644
index 0000000..302c56f
--- /dev/null
+++ b/camera/provider/default/android.hardware.camera.provider-V1-external-service.rc
@@ -0,0 +1,8 @@
+service vendor.camera.provider-ext /vendor/bin/hw/android.hardware.camera.provider-V1-external-service
+ interface aidl android.hardware.camera.provider.ICameraProvider/external/0
+ class hal
+ user cameraserver
+ group audio camera input drmrpc usb
+ ioprio rt 4
+ capabilities SYS_NICE
+ task_profiles CameraServiceCapacity MaxPerformance
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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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