Text-to-speech destinations
Choose destinations for text-to-speech output.
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Text-to-speech (TTS) messages are injected to destinations. Destinations determine two factors: output and mechanism.
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Output is where the synthesized speech plays to and decides who hears the TTS message. Each destination uses one of the following outputs:
- Local Playback - messages injected here play back locally on the user’s default render device (for example, loudspeakers or headphones).
- Remote Transmission - messages injected here are sent to remote participants in connected sessions according to transmission policies (the same sessions that basic voice transmits to).
- Local and Remote - messages injected here are simultaneously injected to Local Playback and Remote Transmission.
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Mechanism is how new messages are handled when there is an ongoing message playing. Each destination uses one of the following injection mechanisms:
- Simple - destinations using this mechanism mix together new messages and ongoing messages to play them concurrently.
- Queue - destinations using this mechanism queue new messages in the order they are sent. When the ongoing message finishes playing, this mechanism auto-triggers the message that is next in line.
- Replace - destinations using this mechanism cancel any ongoing message and then replaces it with the new message.
You can inject synthesized speech into the following destinations:
참고
Most destinations are independent and do not affect the behavior of any other destinations. However, the two queued destinations involving remote transmission share a queue.
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Remote Transmission
- Enum value:
TTSDestination::RemoteTransmission - Output: Remote Transmission
- Mechanism: Simple
- Enum value:
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Local Playback
- Enum value:
TTSDestination::LocalPlayback - Output: Local Playback
- Mechanism: Simple
- Enum value:
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Remote Transmission with Local Playback
- Enum value:
TTSDestination::RemoteTransmissionWithLocalPlayback - Output: Local and Remote
- Mechanism: Simple
- Enum value:
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Queued Remote Transmission
- Enum value:
TTSDestination::QueuedRemoteTransmission - Output: Remote Transmission
- Mechanism: Queue
- Caveat: Shares queue with Queued Remote Transmission with Local Playback.
- Enum value:
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Queued Local Playback
- Enum value:
TTSDestination::QueuedLocalPlayback - Output: Local Playback
- Mechanism: Queue
- Enum value:
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Queued Remote Transmission with Local Playback
- Enum value:
TTSDestination::QueuedRemoteTransmissionWithLocalPlayback - Output: Local and Remote
- Mechanism: Queue
- Caveat: Shares queue with Queued Remote Transmission
- Enum value:
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Screen Reader
- Enum value:
TTSDestination::ScreenReader - Output: Local Playback
- Mechanism: Replace
- Enum value:
You can obtain the state and content of all messages that are playing or are enqueued in any destination by using . Queued destinations return their in queue order, and others in the order that speech was injected.
ITextToSpeech::GetMessages(TTSDestination Destination)TArray<ITTSMessage\*>