Merge pull request #1024 from pipecat-ai/mb/elevenlabs-http

Add ElevenLabsHttpTTSService

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added `ElevenLabsHttpTTSService` and the
+  `07d-interruptible-elevenlabs-http.py` foundational example.
+
 - Introduced pipeline frame observers. Observers can view all the frames that go
   through the pipeline without the need to inject processors in the
   pipeline. This can be useful, for example, to implement frame loggers or

src/pipecat/services/elevenlabs.py

@@ -7,8 +7,9 @@
 import asyncio
 import base64
 import json
-from typing import Any, AsyncGenerator, Dict, List, Literal, Mapping, Optional, Tuple
+from typing import Any, AsyncGenerator, Dict, List, Literal, Mapping, Optional, Tuple, Union
 
+import aiohttp
 from loguru import logger
 from pydantic import BaseModel, model_validator
 
@@ -16,6 +17,7 @@ from pipecat.frames.frames import (
     BotStoppedSpeakingFrame,
     CancelFrame,
     EndFrame,
+    ErrorFrame,
     Frame,
     LLMFullResponseEndFrame,
     StartFrame,
@@ -26,13 +28,15 @@ from pipecat.frames.frames import (
     TTSStoppedFrame,
 )
 from pipecat.processors.frame_processor import FrameDirection
-from pipecat.services.ai_services import WordTTSService
+from pipecat.services.ai_services import TTSService, WordTTSService
 from pipecat.services.websocket_service import WebsocketService
 from pipecat.transcriptions.language import Language
 
 # See .env.example for ElevenLabs configuration needed
 try:
     import websockets
+    from elevenlabs import VoiceSettings
+    from elevenlabs.client import ElevenLabs
 except ModuleNotFoundError as e:
     logger.error(f"Exception: {e}")
     logger.error(
@@ -418,3 +422,160 @@ class ElevenLabsTTSService(WordTTSService, WebsocketService):
             yield None
         except Exception as e:
             logger.error(f"{self} exception: {e}")
+
+
+class ElevenLabsHttpTTSService(TTSService):
+    """ElevenLabs Text-to-Speech service using HTTP streaming.
+
+    Args:
+        api_key: ElevenLabs API key
+        voice_id: ID of the voice to use
+        aiohttp_session: aiohttp ClientSession
+        model: Model ID (default: "eleven_flash_v2_5" for low latency)
+        base_url: API base URL
+        output_format: Audio output format (PCM)
+        params: Additional parameters for voice configuration
+    """
+
+    class InputParams(BaseModel):
+        language: Optional[Language] = Language.EN
+        optimize_streaming_latency: Optional[int] = None
+        stability: Optional[float] = None
+        similarity_boost: Optional[float] = None
+        style: Optional[float] = None
+        use_speaker_boost: Optional[bool] = None
+
+    def __init__(
+        self,
+        *,
+        api_key: str,
+        voice_id: str,
+        aiohttp_session: aiohttp.ClientSession,
+        model: str = "eleven_flash_v2_5",
+        base_url: str = "https://api.elevenlabs.io",
+        output_format: ElevenLabsOutputFormat = "pcm_24000",
+        params: InputParams = InputParams(),
+        **kwargs,
+    ):
+        super().__init__(sample_rate=sample_rate_from_output_format(output_format), **kwargs)
+
+        self._api_key = api_key
+        self._base_url = base_url
+        self._output_format = output_format
+        self._params = params
+        self._session = aiohttp_session
+
+        self._settings = {
+            "sample_rate": sample_rate_from_output_format(output_format),
+            "language": self.language_to_service_language(params.language)
+            if params.language
+            else "en",
+            "output_format": output_format,
+            "optimize_streaming_latency": params.optimize_streaming_latency,
+            "stability": params.stability,
+            "similarity_boost": params.similarity_boost,
+            "style": params.style,
+            "use_speaker_boost": params.use_speaker_boost,
+        }
+        self.set_model_name(model)
+        self.set_voice(voice_id)
+        self._voice_settings = self._set_voice_settings()
+
+    def can_generate_metrics(self) -> bool:
+        return True
+
+    def _set_voice_settings(self) -> Optional[Dict[str, Union[float, bool]]]:
+        """Configure voice settings if stability and similarity_boost are provided.
+
+        Returns:
+            Dictionary of voice settings or None if required parameters are missing.
+        """
+        voice_settings: Dict[str, Union[float, bool]] = {}
+        if (
+            self._settings["stability"] is not None
+            and self._settings["similarity_boost"] is not None
+        ):
+            voice_settings["stability"] = float(self._settings["stability"])
+            voice_settings["similarity_boost"] = float(self._settings["similarity_boost"])
+            if self._settings["style"] is not None:
+                voice_settings["style"] = float(self._settings["style"])
+            if self._settings["use_speaker_boost"] is not None:
+                voice_settings["use_speaker_boost"] = bool(self._settings["use_speaker_boost"])
+        else:
+            if self._settings["style"] is not None:
+                logger.warning(
+                    "'style' is set but will not be applied because 'stability' and 'similarity_boost' are not both set."
+                )
+            if self._settings["use_speaker_boost"] is not None:
+                logger.warning(
+                    "'use_speaker_boost' is set but will not be applied because 'stability' and 'similarity_boost' are not both set."
+                )
+
+        return voice_settings or None
+
+    async def run_tts(self, text: str) -> AsyncGenerator[Frame, None]:
+        """Generate speech from text using ElevenLabs streaming API.
+
+        Args:
+            text: The text to convert to speech
+
+        Yields:
+            Frames containing audio data and status information
+        """
+        logger.debug(f"Generating TTS: [{text}]")
+
+        url = f"{self._base_url}/v1/text-to-speech/{self._voice_id}/stream"
+
+        payload = {
+            "text": text,
+            "model_id": self._model_name,
+        }
+
+        if self._voice_settings:
+            payload["voice_settings"] = json.dumps(self._voice_settings)
+
+        if self._settings["language"]:
+            payload["language_code"] = self._settings["language"]
+
+        headers = {
+            "xi-api-key": self._api_key,
+            "Content-Type": "application/json",
+        }
+
+        # Build query parameters
+        params = {
+            "output_format": self._output_format,
+        }
+        if self._settings["optimize_streaming_latency"] is not None:
+            params["optimize_streaming_latency"] = self._settings["optimize_streaming_latency"]
+
+        logger.debug(f"ElevenLabs request - payload: {payload}, params: {params}")
+
+        try:
+            await self.start_ttfb_metrics()
+
+            async with self._session.post(
+                url, json=payload, headers=headers, params=params
+            ) as response:
+                if response.status != 200:
+                    error_text = await response.text()
+                    logger.error(f"{self} error: {error_text}")
+                    yield ErrorFrame(error=f"ElevenLabs API error: {error_text}")
+                    return
+
+                await self.start_tts_usage_metrics(text)
+                yield TTSStartedFrame()
+
+                async for chunk in response.content:
+                    if chunk:
+                        await self.stop_ttfb_metrics()
+                        yield TTSAudioRawFrame(chunk, self._settings["sample_rate"], 1)
+
+                yield TTSStoppedFrame()
+
+        except Exception as e:
+            logger.error(f"Error in run_tts: {e}")
+            yield ErrorFrame(error=str(e))
+
+        finally:
+            yield TTSStoppedFrame()