feat(tts): integrate AsyncAI TTS engine into livekit

livekit-plugins/livekit-plugins-asyncai/README.md

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+# Async plugin for LiveKit Agents
+
+Support for text-to-speech with [Async](https://async.com/).
+
+See [AsyncAI TTS docs](https://docs.livekit.io/agents/integrations/tts/asyncai/) for more information.
+
+## Installation
+
+```bash
+pip install livekit-plugins-asyncai
+```
+
+## Pre-requisites
+
+You'll need an API key from Async. It can be set as an environment variable: `ASYNCAI_API_KEY`

livekit-plugins/livekit-plugins-asyncai/livekit/plugins/asyncai/__init__.py

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+# Copyright 2023 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.
+
+"""AsyncAI plugin for LiveKit Agents
+
+See https://docs.livekit.io/agents/integrations/tts/asyncai/ for more information.
+"""
+
+from .tts import TTS
+from .version import __version__
+
+__all__ = ["TTS", "__version__"]
+
+from livekit.agents import Plugin
+
+from .log import logger
+
+
+class AsyncAIPlugin(Plugin):
+    def __init__(self) -> None:
+        super().__init__(__name__, __version__, __package__, logger)
+
+
+Plugin.register_plugin(AsyncAIPlugin())
+
+# Cleanup docs of unexported modules
+_module = dir()
+NOT_IN_ALL = [m for m in _module if m not in __all__]
+
+__pdoc__ = {}
+
+for n in NOT_IN_ALL:
+    __pdoc__[n] = False

livekit-plugins/livekit-plugins-asyncai/livekit/plugins/asyncai/constants.py

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+API_AUTH_HEADER = "api_key"
+API_VERSION_HEADER = "version"
+API_VERSION = "v1"

livekit-plugins/livekit-plugins-asyncai/livekit/plugins/asyncai/log.py

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+import logging
+
+logger = logging.getLogger("livekit.plugins.asyncai")

livekit-plugins/livekit-plugins-asyncai/livekit/plugins/asyncai/models.py

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+from typing import Literal
+
+TTSEncoding = Literal["pcm_s16le", "pcm_f32le", "pcm_mulaw"]
+
+TTSModels = Literal["asyncflow_multilingual_v1.0", "asyncflow_v2.0"]
+TTSLanguages = Literal["en", "de", "es", "fr", "it"]
+TTSDefaultVoiceId = "e0f39dc4-f691-4e78-bba5-5c636692cc04"