成员的完整列表，这些成员属于 com.netease.lava.nertc.sdk.NERtcConstants.NERtcVirtualBackgroundSourceStateReason,包括所有继承而来的类成员

VBS_STATE_REASON_COLOR_FORMAT_NOT_SUPPORTED	com.netease.lava.nertc.sdk.NERtcConstants.NERtcVirtualBackgroundSourceStateReason
VBS_STATE_REASON_DEVICE_NOT_SUPPORTED	com.netease.lava.nertc.sdk.NERtcConstants.NERtcVirtualBackgroundSourceStateReason
VBS_STATE_REASON_IMAGE_FORMAT_NOT_SUPPORTED	com.netease.lava.nertc.sdk.NERtcConstants.NERtcVirtualBackgroundSourceStateReason
VBS_STATE_REASON_IMAGE_NOT_EXIST	com.netease.lava.nertc.sdk.NERtcConstants.NERtcVirtualBackgroundSourceStateReason
VBS_STATE_REASON_SUCCESS	com.netease.lava.nertc.sdk.NERtcConstants.NERtcVirtualBackgroundSourceStateReason