pipecat/examples/foundational/07a-interruptible-speechmatics-vad.py

#
# Copyright (c) 2024-2026, Daily
#
# SPDX-License-Identifier: BSD 2-Clause License
#

import os

import aiohttp
from dotenv import load_dotenv
from loguru import logger

from pipecat.frames.frames import LLMRunFrame
from pipecat.pipeline.pipeline import Pipeline
from pipecat.pipeline.runner import PipelineRunner
from pipecat.pipeline.task import PipelineParams, PipelineTask
from pipecat.processors.aggregators.llm_context import LLMContext
from pipecat.processors.aggregators.llm_response_universal import (
    LLMContextAggregatorPair,
    LLMUserAggregatorParams,
)
from pipecat.runner.types import RunnerArguments
from pipecat.runner.utils import create_transport
from pipecat.services.openai.base_llm import BaseOpenAILLMService
from pipecat.services.openai.llm import OpenAILLMService
from pipecat.services.speechmatics.stt import SpeechmaticsSTTService
from pipecat.services.speechmatics.tts import SpeechmaticsTTSService
from pipecat.transcriptions.language import Language
from pipecat.transports.base_transport import BaseTransport, TransportParams
from pipecat.transports.daily.transport import DailyParams
from pipecat.transports.websocket.fastapi import FastAPIWebsocketParams
from pipecat.turns.user_turn_strategies import ExternalUserTurnStrategies

load_dotenv(override=True)

# We store functions so objects (e.g. SileroVADAnalyzer) don't get
# instantiated. The function will be called when the desired transport gets
# selected.
transport_params = {
    "daily": lambda: DailyParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
    ),
    "twilio": lambda: FastAPIWebsocketParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
    ),
    "webrtc": lambda: TransportParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
    ),
}


async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
    """Speechmatics STT and TTS Service Example

    This example demonstrates using Speechmatics Speech-to-Text and Text-to-Speech services
    with speaker diarization and intelligent speaker management. Key features:

    1. Speaker Diarization (STT)
       - Automatically identifies and distinguishes between different speakers
       - First speaker is identified as 'S1', others get subsequent IDs
       - Uses `enable_diarization` parameter to manage speaker detection

    2. Smart Speaker Control (STT)
       - `focus_speakers` parameter lets you target specific speakers (e.g. ["S1"])
       - Other speakers will be wrapped in PASSIVE tags
       - Only processes speech from focused speakers
       - Words from all speakers are wrapped with XML tags for clear speaker identification
       - Other speakers' speech only sent when focused speaker is active

    3. Voice Activity Detection (STT)
       - Built-in VAD using `enable_vad` parameter
       - Remove `vad_analyzer` from `transport` config to use module's VAD
       - Emits speaker started/stopped events

    4. Text-to-Speech (TTS)
       - Low latency streaming audio synthesis
       - Multiple voice options available including `sarah`, `theo`, `megan` and `jack`

    5. Configuration Options
       - `operating_point` parameter defaults to `ENHANCED` for optimal accuracy
       - Configurable `end_of_utterance_silence_trigger` (default 0.5s)
       - Customizable speaker formatting
       - Additional diarization settings available

    For detailed information:
    - STT: https://docs.speechmatics.com/rt-api-ref
    - TTS: https://docs.speechmatics.com/text-to-speech/quickstart
    """

    logger.info(f"Starting bot")
    async with aiohttp.ClientSession() as session:
        stt = SpeechmaticsSTTService(
            api_key=os.getenv("SPEECHMATICS_API_KEY"),
            params=SpeechmaticsSTTService.InputParams(
                language=Language.EN,
                turn_detection_mode=SpeechmaticsSTTService.TurnDetectionMode.ADAPTIVE,
                # focus_speakers=["S1"],
                speaker_active_format="<{speaker_id}>{text}</{speaker_id}>",
                speaker_passive_format="<PASSIVE><{speaker_id}>{text}</{speaker_id}></PASSIVE>",
            ),
        )

        tts = SpeechmaticsTTSService(
            api_key=os.getenv("SPEECHMATICS_API_KEY"),
            voice_id="sarah",
            aiohttp_session=session,
        )

        llm = OpenAILLMService(
            api_key=os.getenv("OPENAI_API_KEY"),
            params=BaseOpenAILLMService.InputParams(temperature=0.75),
        )

        messages = [
            {
                "role": "system",
                "content": (
                    "You are a helpful British assistant called Sarah. "
                    "Your goal is to demonstrate your capabilities in a succinct way. "
                    "Your output will be spoken aloud, so avoid special characters that can't easily be spoken, such as emojis or bullet points. "
                    "Always include punctuation in your responses. "
                    "Give very short replies - do not give longer replies unless strictly necessary. "
                    "Respond to what the user said in a concise, funny, creative and helpful way. "
                    "Use `<Sn/>` tags to identify different speakers - do not use tags in your replies. "
                    "Do not respond to speakers within `<PASSIVE/>` tags unless explicitly asked to. "
                ),
            },
        ]

        context = LLMContext(messages)
        context_aggregator = LLMContextAggregatorPair(
            context,
            user_params=LLMUserAggregatorParams(user_turn_strategies=ExternalUserTurnStrategies()),
        )

        pipeline = Pipeline(
            [
                transport.input(),  # Transport user input
                stt,
                context_aggregator.user(),  # User responses
                llm,  # LLM
                tts,  # TTS
                transport.output(),  # Transport bot output
                context_aggregator.assistant(),  # Assistant spoken responses
            ]
        )

        task = PipelineTask(
            pipeline,
            params=PipelineParams(
                enable_metrics=True,
                enable_usage_metrics=True,
            ),
            idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
        )

        @transport.event_handler("on_client_connected")
        async def on_client_connected(transport, client):
            logger.info(f"Client connected")
            # Kick off the conversation.
            messages.append({"role": "system", "content": "Say a short hello to the user."})
            await task.queue_frames([LLMRunFrame()])

        @transport.event_handler("on_client_disconnected")
        async def on_client_disconnected(transport, client):
            logger.info(f"Client disconnected")
            await task.cancel()

        runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)

        await runner.run(task)


async def bot(runner_args: RunnerArguments):
    """Main bot entry point compatible with Pipecat Cloud."""
    transport = await create_transport(runner_args, transport_params)
    await run_bot(transport, runner_args)


if __name__ == "__main__":
    from pipecat.runner.run import main

    main()