Text-to-speech events

Learn about text-to-speech event callbacks.

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Text-to-speech (TTS) reports the following events through the standard Vivox events reporting mechanism:

```
vx_evt_tts_injection_started
```
- Raised when a TTS message has finished preparing for playback and is starting to play.
- ```
num_consumers
```
  - The number of active sessions (for
```
tts_dest_remote_transmission
```
  ) or local playback players (for
```
tts_dest_local_playback
```
  ) that the TTS message is injected into.
- ```
utterance_id
```
  - The unique identifier of the TTS message or utterance. This is the same identifier as the one that is returned to you when calling
```
vx_tts_speak
```
  .
- ```
utterance_duration
```
  - The duration of the utterance in seconds.
- ```
tts_destination
```
  - The destination into which the TTS message is injected.
```
vx_evt_tts_injection_ended
```
- Raised when a TTS message finishes playback.
- ```
num_consumers
```
  - The number of active sessions (for
```
tts_dest_remote_transmission
```
  ) or local playback players (for
```
tts_dest_local_playback
```
  ) that the TTS message is injected into.
- ```
utterance_id
```
  - The unique identifier of the TTS message or utterance. This is the same identifier as the one that is returned to you when calling
```
vx_tts_speak
```
  .
- ```
tts_destination
```
  - The destination into which the TTS message is injected.
```
vx_evt_tts_injection_failed
```
- Raised when playback of a TTS message has failed.
- ```
status
```
  - The error code of the failure.
- ```
utterance_id
```
  - The unique identifier of the TTS message or utterance. This is the same identifier as the one that is returned to you when calling
```
vx_tts_speak
```
  .
- ```
tts_destination
```
  - The destination into which the TTS message is injected.

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Vivox Core SDK

Vivox Core SDK

Text-to-speech events