Fix audio format for VoIP (home-assistant#125785)

Fix audio format

homeassistant/components/voip/assist_satellite.py

@@ -8,7 +8,7 @@
 import io
 import logging
 from pathlib import Path
-from typing import TYPE_CHECKING, Final
+from typing import TYPE_CHECKING, Any, Final
 import wave
 
 from voip_utils import RtpDatagramProtocol
@@ -120,6 +120,16 @@ def vad_sensitivity_entity_id(self) -> str | None:
         """Return the entity ID of the VAD sensitivity to use for the next conversation."""
         return self.voip_device.get_vad_sensitivity_entity_id(self.hass)
 
+    @property
+    def tts_options(self) -> dict[str, Any] | None:
+        """Options passed for text-to-speech."""
+        return {
+            tts.ATTR_PREFERRED_FORMAT: "wav",
+            tts.ATTR_PREFERRED_SAMPLE_RATE: 16000,
+            tts.ATTR_PREFERRED_SAMPLE_CHANNELS: 1,
+            tts.ATTR_PREFERRED_SAMPLE_BYTES: 2,
+        }
+
     async def async_added_to_hass(self) -> None:
         """Run when entity about to be added to hass."""
         await super().async_added_to_hass()

tests/components/voip/test_voip.py

@@ -3,14 +3,15 @@
 import asyncio
 import io
 from pathlib import Path
+from typing import Any
 from unittest.mock import AsyncMock, Mock, patch
 import wave
 
 import pytest
 from syrupy.assertion import SnapshotAssertion
 from voip_utils import CallInfo
 
-from homeassistant.components import assist_pipeline, assist_satellite, voip
+from homeassistant.components import assist_pipeline, assist_satellite, tts, voip
 from homeassistant.components.assist_satellite.entity import (
     AssistSatelliteEntity,
     AssistSatelliteState,
@@ -205,11 +206,24 @@ async def test_pipeline(
     bad_chunk = bytes([1, 2, 3, 4])
 
     async def async_pipeline_from_audio_stream(
-        hass: HomeAssistant, context: Context, *args, device_id: str | None, **kwargs
+        hass: HomeAssistant,
+        context: Context,
+        *args,
+        device_id: str | None,
+        tts_audio_output: str | dict[str, Any] | None,
+        **kwargs,
     ):
         assert context.user_id == voip_user_id
         assert device_id == voip_device.device_id
 
+        # voip can only stream WAV
+        assert tts_audio_output == {
+            tts.ATTR_PREFERRED_FORMAT: "wav",
+            tts.ATTR_PREFERRED_SAMPLE_RATE: 16000,
+            tts.ATTR_PREFERRED_SAMPLE_CHANNELS: 1,
+            tts.ATTR_PREFERRED_SAMPLE_BYTES: 2,
+        }
+
         stt_stream = kwargs["stt_stream"]
         event_callback = kwargs["event_callback"]
         in_command = False