功能需求

Elevenlabs的langchain API集成应该包含一个非常重要的参数voice。

动机

如果没有voice参数，Elevenlabs的langchain集成将无法使用，因为play()在每次执行时都会随机切换语音。

你的贡献

我追踪到了Elevenlabs-langchain集成API中相关的代码，一直到这个部分：

def _run(
        self, query: str, run_manager: Optional[CallbackManagerForToolRun] = None
    ) -> str:
        """Use the tool."""
        elevenlabs = _import_elevenlabs()
        try:
            speech = elevenlabs.generate(text=query, model=self.model)
            with tempfile.NamedTemporaryFile(
                mode="bx", suffix=".wav", delete=False
            ) as f:
                f.write(speech)
            return f.name
        except Exception as e:
            raise RuntimeError(f"Error while running ElevenLabsText2SpeechTool: {e}")

[[docs]](https://api.python.langchain.com/en/latest/tools/langchain.tools.eleven_labs.text2speech.ElevenLabsText2SpeechTool.html#langchain.tools.eleven_labs.text2speech.ElevenLabsText2SpeechTool.play)    def play(self, speech_file: str) -> None:
        """Play the text as speech."""
        elevenlabs = _import_elevenlabs()
        with open(speech_file, mode="rb") as f:
            speech = f.read()

        elevenlabs.play(speech)

[[docs]](https://api.python.langchain.com/en/latest/tools/langchain.tools.eleven_labs.text2speech.ElevenLabsText2SpeechTool.html#langchain.tools.eleven_labs.text2speech.ElevenLabsText2SpeechTool.stream_speech)    def stream_speech(self, query: str) -> None:
        """Stream the text as speech as it is generated.
        Play the text in your speakers."""
        elevenlabs = _import_elevenlabs()
        speech_stream = elevenlabs.generate(text=query, model=self.model, stream=True)
        elevenlabs.stream(speech_stream)

必须用voice参数扩展对elevenlabs.generate和elevenlabs.play的调用。
在此更改后，可以像从ElevenLabs API发出的调用一样进行langchain调用run、play以及最重要的是stream_speech,例如在这个仓库中看到的：

prediction = agent_chain.run(input=user_input.text)
    audio = generate(
        text=prediction,
        voice="Adam",
        model="eleven_monolingual_v1"
    )