Add livekit-plugins-funasr (FunASR/SenseVoice local STT)

livekit-plugins/livekit-plugins-funasr/README.md

@@ -0,0 +1,21 @@
+# LiveKit Plugins FunASR
+
+Agent Framework plugin for local speech-to-text with [FunASR](https://github.com/modelscope/FunASR) models such as [SenseVoice](https://github.com/FunAudioLLM/SenseVoice).
+
+SenseVoice is an open-source, fully-local, non-autoregressive multilingual ASR model (Chinese, Cantonese, English, Japanese, Korean and more) with leading Chinese accuracy and fast inference. The model runs locally, so no API key is required.
+
+## Installation
+
+```bash
+pip install livekit-plugins-funasr
+```
+
+## Usage
+
+```python
+from livekit.plugins import funasr
+
+stt = funasr.STT(model="iic/SenseVoiceSmall", device="cuda")
+```
+
+The first run downloads the model from ModelScope/Hugging Face. Use `language=None` (default) for automatic language detection, or set e.g. `language="zh"`.

livekit-plugins/livekit-plugins-funasr/livekit/plugins/funasr/__init__.py

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+# Copyright 2024 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""FunASR plugin for LiveKit Agents.
+
+Local, fully-offline multilingual speech-to-text using FunASR models such as
+SenseVoice (Chinese, Cantonese, English, Japanese, Korean and more).
+See https://github.com/modelscope/FunASR for more information.
+"""
+
+from .stt import FunASRSTT, FunASRSTT as STT
+from .version import __version__
+
+__all__ = ["FunASRSTT", "STT", "__version__"]
+
+from livekit.agents import Plugin
+
+from .log import logger
+
+
+class FunASRPlugin(Plugin):
+    def __init__(self) -> None:
+        super().__init__(__name__, __version__, __package__, logger)
+
+
+Plugin.register_plugin(FunASRPlugin())

livekit-plugins/livekit-plugins-funasr/livekit/plugins/funasr/log.py

@@ -0,0 +1,3 @@
+import logging
+
+logger = logging.getLogger("livekit.plugins.funasr")

livekit-plugins/livekit-plugins-funasr/livekit/plugins/funasr/stt.py

@@ -0,0 +1,161 @@
+# Copyright 2024 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+import asyncio
+import re
+from dataclasses import dataclass
+
+import numpy as np
+
+from livekit import rtc
+from livekit.agents import APIConnectionError, APIConnectOptions, LanguageCode, stt
+from livekit.agents.stt import SpeechEventType, STTCapabilities
+from livekit.agents.types import NOT_GIVEN, NotGivenOr
+from livekit.agents.utils import AudioBuffer, is_given
+
+from .log import logger
+
+try:
+    from funasr import AutoModel  # type: ignore
+    from funasr.utils.postprocess_utils import rich_transcription_postprocess  # type: ignore
+except ImportError as e:
+    raise ImportError(
+        "funasr is required for the FunASR plugin. Install it with: pip install funasr"
+    ) from e
+
+# Languages natively supported by SenseVoice; anything else falls back to auto-detect.
+_FUNASR_LANGUAGES = {"zh", "en", "ja", "ko", "yue", "nospeech"}
+# Spoken-language codes reported as the detected language (excludes "nospeech",
+# which is a SenseVoice classification label, not a language).
+_DETECTED_LANGUAGES = {"zh", "en", "ja", "ko", "yue"}
+_SAMPLE_RATE = 16000
+_LANG_TAG_RE = re.compile(r"<\|([a-z]+)\|>")
+
+
+def _normalize_language(language: NotGivenOr[str]) -> str:
+    if not is_given(language) or not language:
+        return "auto"
+    code = str(language).split("-")[0].lower()
+    return code if code in _FUNASR_LANGUAGES else "auto"
+
+
+@dataclass
+class _STTOptions:
+    language: str = "auto"
+    use_itn: bool = True
+
+
+class FunASRSTT(stt.STT):
+    """Local speech-to-text using a FunASR model such as SenseVoice.
+
+    SenseVoice is an open-source, fully-local, non-autoregressive multilingual ASR
+    model (Chinese, Cantonese, English, Japanese, Korean and more) with strong
+    Chinese accuracy and fast inference. The model runs locally; no API key needed.
+    """
+
+    def __init__(
+        self,
+        *,
+        model: str = "iic/SenseVoiceSmall",
+        device: str = "cpu",
+        language: NotGivenOr[str] = NOT_GIVEN,
+        use_itn: bool = True,
+    ) -> None:
+        """Create a FunASR STT instance.
+
+        Args:
+            model: FunASR model id on ModelScope/Hugging Face (default
+                ``"iic/SenseVoiceSmall"``).
+            device: Inference device, ``"cpu"`` or ``"cuda"``.
+            language: Default language. When not given, the language is
+                auto-detected per utterance.
+            use_itn: Apply inverse text normalization (e.g. "nine" -> "9").
+        """
+        super().__init__(capabilities=STTCapabilities(streaming=False, interim_results=False))
+        self._model_name = model
+        self._opts = _STTOptions(language=_normalize_language(language), use_itn=use_itn)
+        # FunASR's model.generate is not guaranteed thread-safe; serialize access
+        # across concurrent _recognize_impl calls that share this instance.
+        self._lock = asyncio.Lock()
+        logger.info(f"loading FunASR model {model} on {device}...")
+        self._model = AutoModel(model=model, device=device, disable_update=True)
+        logger.info("FunASR model loaded")
+
+    @property
+    def model(self) -> str:
+        return self._model_name
+
+    @property
+    def provider(self) -> str:
+        return "FunASR"
+
+    def update_options(
+        self,
+        *,
+        language: NotGivenOr[str] = NOT_GIVEN,
+        use_itn: NotGivenOr[bool] = NOT_GIVEN,
+    ) -> None:
+        if is_given(language):
+            self._opts.language = _normalize_language(language)
+        if is_given(use_itn):
+            self._opts.use_itn = use_itn
+
+    async def _recognize_impl(
+        self,
+        buffer: AudioBuffer,
+        *,
+        language: NotGivenOr[str] = NOT_GIVEN,
+        conn_options: APIConnectOptions,
+    ) -> stt.SpeechEvent:
+        lang = _normalize_language(language) if is_given(language) else self._opts.language
+
+        combined = rtc.combine_audio_frames(buffer)
+        channels = combined.num_channels
+        if combined.sample_rate != _SAMPLE_RATE:
+            resampler = rtc.AudioResampler(
+                combined.sample_rate, _SAMPLE_RATE, num_channels=channels
+            )
+            frames = list(resampler.push(combined)) + list(resampler.flush())
+            data = b"".join(bytes(f.data) for f in frames)
+        else:
+            data = bytes(combined.data)
+        samples = np.frombuffer(data, dtype=np.int16).astype(np.float32) / 32768.0
+        if channels > 1:
+            samples = samples.reshape(-1, channels).mean(axis=1)
+
+        def _run() -> str:
+            result = self._model.generate(
+                input=samples,
+                cache={},
+                language=lang,
+                use_itn=self._opts.use_itn,
+            )
+            return result[0]["text"] if result else ""
+
+        try:
+            async with self._lock:
+                raw = await asyncio.to_thread(_run)
+        except Exception as e:
+            raise APIConnectionError("failed to run FunASR inference") from e
+
+        text = rich_transcription_postprocess(raw).strip()
+        m = _LANG_TAG_RE.match(raw)
+        detected = m.group(1) if m and m.group(1) in _DETECTED_LANGUAGES else ""
+
+        return stt.SpeechEvent(
+            type=SpeechEventType.FINAL_TRANSCRIPT,
+            alternatives=[stt.SpeechData(text=text, language=LanguageCode(detected))],
+        )

livekit-plugins/livekit-plugins-funasr/livekit/plugins/funasr/version.py

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+# Copyright 2024 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__version__ = "0.1.0"

livekit-plugins/livekit-plugins-funasr/pyproject.toml

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+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "livekit-plugins-funasr"
+dynamic = ["version"]
+description = "FunASR (SenseVoice) local STT plugin for LiveKit Agents"
+readme = "README.md"
+license = "Apache-2.0"
+requires-python = ">=3.10.0"
+authors = [{ name = "LiveKit" }]
+keywords = ["voice", "ai", "realtime", "audio", "video", "livekit", "webrtc"]
+classifiers = [
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: Apache Software License",
+    "Topic :: Multimedia :: Sound/Audio",
+    "Topic :: Multimedia :: Video",
+    "Topic :: Scientific/Engineering :: Artificial Intelligence",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3 :: Only",
+]
+dependencies = ["livekit-agents>=1.2.0", "funasr>=1.1.0", "numpy"]
+
+[project.urls]
+Documentation = "https://docs.livekit.io"
+Website = "https://livekit.io/"
+Source = "https://github.com/livekit/agents"
+
+[tool.hatch.version]
+path = "livekit/plugins/funasr/version.py"
+
+[tool.hatch.build.targets.wheel]
+packages = ["livekit"]
+
+[tool.hatch.build.targets.sdist]
+include = ["/livekit"]
+
+[tool.uv]
+exclude-newer = "7 days"
+exclude-newer-package = { livekit-agents = "0 days" }

pyproject.toml

@@ -23,6 +23,7 @@ livekit-plugins-elevenlabs = { workspace = true }
 livekit-plugins-fal = { workspace = true }
 livekit-plugins-fireworksai = { workspace = true }
 livekit-plugins-fishaudio = { workspace = true }
+livekit-plugins-funasr = { workspace = true }
 livekit-plugins-gladia = { workspace = true }
 livekit-plugins-gnani = { workspace = true }
 livekit-plugins-google = { workspace = true }