Add DeepgramHttpTTSService

src/pipecat/services/deepgram/tts.py

@@ -12,6 +12,7 @@ for generating speech from text using various voice models.
 
 from typing import AsyncGenerator, Optional
 
+import aiohttp
 from loguru import logger
 
 from pipecat.frames.frames import (
@@ -117,3 +118,114 @@ class DeepgramTTSService(TTSService):
         except Exception as e:
             logger.exception(f"{self} exception: {e}")
             yield ErrorFrame(f"Error getting audio: {str(e)}")
+
+
+class DeepgramHttpTTSService(TTSService):
+    """Deepgram HTTP text-to-speech service.
+
+    Provides text-to-speech synthesis using Deepgram's HTTP TTS API.
+    Supports various voice models and audio encoding formats with
+    configurable sample rates and quality settings.
+    """
+
+    def __init__(
+        self,
+        *,
+        api_key: str,
+        voice: str = "aura-2-helena-en",
+        aiohttp_session: aiohttp.ClientSession,
+        base_url: str = "https://api.deepgram.com",
+        sample_rate: Optional[int] = None,
+        encoding: str = "linear16",
+        **kwargs,
+    ):
+        """Initialize the Deepgram TTS service.
+
+        Args:
+            api_key: Deepgram API key for authentication.
+            voice: Voice model to use for synthesis. Defaults to "aura-2-helena-en".
+            aiohttp_session: Shared aiohttp session for HTTP requests with connection pooling.
+            base_url: Custom base URL for Deepgram API. Defaults to "https://api.deepgram.com".
+            sample_rate: Audio sample rate in Hz. If None, uses service default.
+            encoding: Audio encoding format. Defaults to "linear16".
+            **kwargs: Additional arguments passed to parent TTSService class.
+        """
+        super().__init__(sample_rate=sample_rate, **kwargs)
+
+        self._api_key = api_key
+        self._session = aiohttp_session
+        self._base_url = base_url
+        self._settings = {
+            "encoding": encoding,
+        }
+        self.set_voice(voice)
+
+    def can_generate_metrics(self) -> bool:
+        """Check if the service can generate metrics.
+
+        Returns:
+            True, as Deepgram TTS service supports metrics generation.
+        """
+        return True
+
+    @traced_tts
+    async def run_tts(self, text: str) -> AsyncGenerator[Frame, None]:
+        """Generate speech from text using Deepgram's TTS API.
+
+        Args:
+            text: The text to synthesize into speech.
+
+        Yields:
+            Frame: Audio frames containing the synthesized speech, plus start/stop frames.
+        """
+        logger.debug(f"{self}: Generating TTS [{text}]")
+
+        # Build URL with parameters
+        url = f"{self._base_url}/v1/speak"
+
+        headers = {"Authorization": f"Token {self._api_key}", "Content-Type": "application/json"}
+
+        params = {
+            "model": self._voice_id,
+            "encoding": self._settings["encoding"],
+            "sample_rate": self.sample_rate,
+            "container": "none",
+        }
+
+        payload = {
+            "text": text,
+        }
+
+        try:
+            await self.start_ttfb_metrics()
+
+            async with self._session.post(
+                url, headers=headers, json=payload, params=params
+            ) as response:
+                if response.status != 200:
+                    error_text = await response.text()
+                    raise Exception(f"HTTP {response.status}: {error_text}")
+
+                await self.start_tts_usage_metrics(text)
+                yield TTSStartedFrame()
+
+                CHUNK_SIZE = self.chunk_size
+
+                first_chunk = True
+                async for chunk in response.content.iter_chunked(CHUNK_SIZE):
+                    if first_chunk:
+                        await self.stop_ttfb_metrics()
+                        first_chunk = False
+
+                    if chunk:
+                        yield TTSAudioRawFrame(
+                            audio=chunk,
+                            sample_rate=self.sample_rate,
+                            num_channels=1,
+                        )
+
+            yield TTSStoppedFrame()
+
+        except Exception as e:
+            logger.exception(f"{self} exception: {e}")
+            yield ErrorFrame(f"Error getting audio: {str(e)}")