MessageGroup
The MessageGroup message type is a versatile container used in DepthAI pipelines to group together a map of arbitrary DepthAI messages. It serves as the primary output of the Sync node, effectively synchronizing various input streams, and acts as the input to the MessageDemux node for subsequent disaggregation and processing.Creating MessageGroup
MessageGroup can be created automatically by the Sync node as it aligns and groups messages from different sources based on their timestamps. Alternatively, it can be manually constructed in a host application or within a Script node to create custom groupings of DepthAI messages.Reference
class
depthai.MessageGroup(depthai.Buffer)
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getIntervalNs(self) -> int: intRetrieves interval between the first and the last message in the group.
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getMessageNames(self) -> list[str]: list[str]Gets the names of messages in the group
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getSequenceNum(self) -> int: intRetrieves sequence number
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getTimestamp(self) -> datetime.timedelta: datetime.timedeltaRetrieves timestamp related to dai::Clock::now()
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getTimestampDevice(self) -> datetime.timedelta: datetime.timedeltaRetrieves timestamp directly captured from device's monotonic clock, not synchronized to host time. Used mostly for debugging
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isSynced(self, arg0: int) -> bool: boolTrue if all messages in the group are in the interval
Parameter ``thresholdNs``:
Maximal interval between messagesmethod
setSequenceNum(self, arg0: int) -> MessageGroup: MessageGroupRetrieves image sequence number
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setTimestamp(self, arg0: datetime.timedelta) -> MessageGroup: MessageGroupSets image timestamp related to dai::Clock::now()
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setTimestampDevice(self, arg0: datetime.timedelta) -> MessageGroup: MessageGroupSets image timestamp related to dai::Clock::now()
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