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feat(azure): add lexicon_uri option to TTS #4485

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Merged
chenghao-mou merged 1 commit into from
Jan 21, 2026
Merged

feat(azure): add lexicon_uri option to TTS #4485

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10 changes: 10 additions & 0 deletions livekit-plugins/livekit-plugins-azure/livekit/plugins/azure/tts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,7 @@ class _TTSOptions:
deployment_id: str | None
prosody: NotGivenOr[ProsodyConfig]
style: NotGivenOr[StyleConfig]
lexicon_uri: NotGivenOr[str]
auth_token: str | None = None

def get_endpoint_url(self) -> str:
Expand All @@ -132,6 +133,7 @@ def __init__(
sample_rate: int = 24000,
prosody: NotGivenOr[ProsodyConfig] = NOT_GIVEN,
style: NotGivenOr[StyleConfig] = NOT_GIVEN,
lexicon_uri: NotGivenOr[str] = NOT_GIVEN,
speech_key: str | None = None,
speech_region: str | None = None,
speech_endpoint: str | None = None,
Expand Down Expand Up @@ -184,6 +186,7 @@ def __init__(
language=language,
prosody=prosody,
style=style,
lexicon_uri=lexicon_uri,
auth_token=speech_auth_token,
)

Expand All @@ -202,6 +205,7 @@ def update_options(
language: NotGivenOr[str] = NOT_GIVEN,
prosody: NotGivenOr[ProsodyConfig] = NOT_GIVEN,
style: NotGivenOr[StyleConfig] = NOT_GIVEN,
lexicon_uri: NotGivenOr[str] = NOT_GIVEN,
) -> None:
if is_given(voice):
self._opts.voice = voice
Expand All @@ -213,6 +217,8 @@ def update_options(
if is_given(style):
style.validate()
self._opts.style = style
if is_given(lexicon_uri):
self._opts.lexicon_uri = lexicon_uri

def _ensure_session(self) -> aiohttp.ClientSession:
if not self._session:
Expand Down Expand Up @@ -243,6 +249,10 @@ def _build_ssml(self) -> str:
f'xml:lang="{lang}">'
)
ssml += f'<voice name="{self._opts.voice}">'

if is_given(self._opts.lexicon_uri):
ssml += f'<lexicon uri="{self._opts.lexicon_uri}"/>'

if is_given(self._opts.style):
degree = f' styledegree="{self._opts.style.degree}"' if self._opts.style.degree else ""
ssml += f'<mstts:express-as style="{self._opts.style.style}"{degree}>'
Expand Down