feat(ai): Add support for OpenAI TTS speed configuration, defaulting to 1.1x

services/ai_voice_runtime_service/providers/tts.py

@@ -44,6 +44,15 @@ def _openai_tts_voice() -> str:
     return os.getenv("AI_VOICE_TTS_VOICE", "alloy").strip() or "alloy"
 
 
+def _openai_tts_speed() -> float:
+    raw = os.getenv("AI_VOICE_TTS_OPENAI_SPEED", "1.1").strip()
+    try:
+        value = float(raw)
+    except ValueError:
+        value = 1.1
+    return max(0.25, min(value, 4.0))
+
+
 def _yandex_api_base() -> str:
     return (
         os.getenv("AI_VOICE_TTS_YANDEX_API_BASE", "https://tts.api.ml.yandexcloud.kz").strip()
@@ -155,6 +164,7 @@ class OpenAITTSProvider(TTSProvider):
         self._timeout_seconds = _timeout_seconds()
         self._model = _openai_tts_model()
         self._voice = _openai_tts_voice()
+        self._speed = _openai_tts_speed()
         self._cache_enabled = _tts_cache_enabled()
         self._cache_dir = _tts_cache_dir()
         self._cache_lock = Lock()
@@ -164,6 +174,7 @@ class OpenAITTSProvider(TTSProvider):
             "provider": self.name,
             "model": self._model,
             "voice": self._voice,
+            "speed": self._speed,
             "language": str(language or "").strip() or None,
             "text": text,
         }
@@ -202,6 +213,7 @@ class OpenAITTSProvider(TTSProvider):
             "provider": self.name,
             "model": self._model,
             "voice": self._voice,
+            "speed": self._speed,
             "language": str(language or "").strip() or None,
             "sample_rate_hz": synthesis.sample_rate_hz,
             "text": synthesis.text,
@@ -247,6 +259,7 @@ class OpenAITTSProvider(TTSProvider):
                 json={
                     "model": self._model,
                     "voice": self._voice,
+                    "speed": self._speed,
                     "input": text,
                     "response_format": "pcm",
                 },