Add multi-client support in camera2
Add support for multiple clients to access the same camera using
camera2 api. This is initial set of changes and includes all the new
API changes as well as implementation of opening the camera in shared
mode, new open callbacks, newly added characteristics and creating
shared sesion.
After the merge of these initial changes, it will be followed by
another set of changes which will include implementation of
startStreaming and stopStreaming APIs and the capability for multiple
clients to stream the camera images.
Flag: com.android.internal.camera.flags.camera_multi_client
Bug:265196098
API-Coverage-Bug: 377371012
Test: Tested that a java and native client are able to open the camera
at the same time and get the required callbacks and they are able to get
the shared session configuration using newly added characteristics.
Tested the clientaccessprioritieschanged callback occur appropriately
when new client connects/disconnects.
Change-Id: I4cd3babf538b065d635c99c695718d8f52883afc
diff --git a/camera/ndk/impl/ACameraManager.cpp b/camera/ndk/impl/ACameraManager.cpp
index 53c4489..5dddd29 100644
--- a/camera/ndk/impl/ACameraManager.cpp
+++ b/camera/ndk/impl/ACameraManager.cpp
@@ -28,9 +28,11 @@
#include <memory>
#include "ACameraDevice.h"
#include "ACameraMetadata.h"
+#include <com_android_internal_camera_flags.h>
using namespace android::acam;
namespace vd_flags = android::companion::virtualdevice::flags;
+namespace flags = com::android::internal::camera::flags;
namespace android {
namespace acam {
@@ -860,10 +862,36 @@
}
camera_status_t
-ACameraManager::openCamera(
+ACameraManager::isCameraDeviceSharingSupported(
const char* cameraId,
+ /*out*/bool* isSharingSupported) {
+ if (!flags::camera_multi_client()) {
+ return ACAMERA_ERROR_UNSUPPORTED_OPERATION;
+ }
+ sp<ACameraMetadata> spChars;
+ camera_status_t ret = getCameraCharacteristics(cameraId, &spChars);
+ if (ret != ACAMERA_OK) {
+ ALOGE("%s: cannot get camera characteristics for camera %s. err %d",
+ __FUNCTION__, cameraId, ret);
+ return ret;
+ }
+
+ ACameraMetadata* chars = spChars.get();
+ ACameraMetadata_const_entry entry;
+ ret = ACameraMetadata_getConstEntry(chars, ANDROID_SHARED_SESSION_OUTPUT_CONFIGURATIONS,
+ &entry);
+ if (ret != ACAMERA_OK) {
+ return ret;
+ }
+ *isSharingSupported = (entry.count > 0) ? true : false;
+ return ACAMERA_OK;
+}
+
+camera_status_t
+ACameraManager::openCamera(
+ const char* cameraId, bool sharedMode,
ACameraDevice_StateCallbacks* callback,
- /*out*/ACameraDevice** outDevice) {
+ /*out*/ACameraDevice** outDevice, /*out*/bool* primaryClient) {
sp<ACameraMetadata> chars;
camera_status_t ret = getCameraCharacteristics(cameraId, &chars);
Mutex::Autolock _l(mLock);
@@ -873,7 +901,7 @@
return ACAMERA_ERROR_INVALID_PARAMETER;
}
- ACameraDevice* device = new ACameraDevice(cameraId, callback, chars);
+ ACameraDevice* device = new ACameraDevice(cameraId, callback, chars, sharedMode);
sp<hardware::ICameraService> cs = mGlobalManager->getCameraService();
if (cs == nullptr) {
@@ -898,7 +926,7 @@
binder::Status serviceRet = cs->connectDevice(
callbacks, cameraId, /*oomScoreOffset*/0,
targetSdkVersion, /*rotationOverride*/hardware::ICameraService::ROTATION_OVERRIDE_NONE,
- clientAttribution, static_cast<int32_t>(mDeviceContext.policy),
+ clientAttribution, static_cast<int32_t>(mDeviceContext.policy), sharedMode,
/*out*/&deviceRemote);
if (!serviceRet.isOk()) {
@@ -942,6 +970,14 @@
return ACAMERA_ERROR_CAMERA_DISCONNECTED;
}
device->setRemoteDevice(deviceRemote);
+ if (flags::camera_multi_client() && sharedMode) {
+ binder::Status remoteRet = deviceRemote->isPrimaryClient(primaryClient);
+ if (!remoteRet.isOk()) {
+ delete device;
+ return ACAMERA_ERROR_UNKNOWN;
+ }
+ device->setPrimaryClient(*primaryClient);
+ }
*outDevice = device;
return ACAMERA_OK;
}