[唤醒应答加速]：完成ACK音频预热缓存，包含唤醒后复用播放和回归测试

src/owner_voice_pet/assistant_pipeline.py

@@ -122,6 +122,8 @@ class TurnController:
         self.sentence_buffer = sentence_buffer or SentenceBuffer()
         self._states: list[PipelineState] = []
         self._pending_capture_frames: list[AudioFrame] = []
+        self._cached_ack_text: str | None = None
+        self._cached_ack_segment: AudioSegment | None = None
 
     def run_turn(self, turn_id: int) -> TurnResult:
         self._states = []
@@ -139,6 +141,15 @@ class TurnController:
         except ProviderError as exc:
             return self._recover(exc, turn_id)
 
+    def prepare_ack_audio(self) -> None:
+        text = self.config.wake_ack_text.strip()
+        if not text:
+            self._cached_ack_text = None
+            self._cached_ack_segment = None
+            return
+        self._cached_ack_text = text
+        self._cached_ack_segment = self.ack_tts.synthesize(text)
+
     def _wait_for_wake_and_user_text(self, turn_id: int) -> str | ProviderError:
         wake_error = self._wait_for_local_wake()
         if wake_error is not None:
@@ -300,7 +311,7 @@ class TurnController:
             return None
         try:
             self._event(ACK_STARTED, PipelineState.SPEAKING, f"应答中：{text}", turn_id=turn_id)
-            segment = self.ack_tts.synthesize(text)
+            segment = self._ack_segment(text)
             playback = self.transport.play_pcm(segment)
             if playback.error:
                 return playback.error
@@ -309,6 +320,12 @@ class TurnController:
         except ProviderError as exc:
             return exc
 
+    def _ack_segment(self, text: str) -> AudioSegment:
+        if self._cached_ack_text != text or self._cached_ack_segment is None:
+            self._cached_ack_text = text
+            self._cached_ack_segment = self.ack_tts.synthesize(text)
+        return self._cached_ack_segment
+
     def _reply_to_user(self, user_text: str, turn_id: int) -> TurnResult:
         completed_turns = 0
         current_user_text = user_text
@@ -664,6 +681,7 @@ class VoiceAssistantPipeline:
         self.tts.load()
         if self.ack_tts is not self.tts:
             self.ack_tts.load()
+        self.controller.prepare_ack_audio()
 
     def run(self, *, once: bool = False, max_turns: int | None = None) -> RuntimeSummary:
         completed = 0

src/owner_voice_pet/runtime.py

@@ -115,6 +115,8 @@ class LiveVoiceRuntime:
         self.event_bus.subscribe(self._report_event)
         self.sentence_buffer = sentence_buffer or SentenceBuffer()
         self._states: list[PipelineState] = []
+        self._cached_ack_text: str | None = None
+        self._cached_ack_segment: AudioSegment | None = None
 
     def load(self) -> None:
         self.wakeword.load()
@@ -123,6 +125,16 @@ class LiveVoiceRuntime:
         self.tts.load()
         if self.ack_tts is not self.tts:
             self.ack_tts.load()
+        self.prepare_ack_audio()
+
+    def prepare_ack_audio(self) -> None:
+        text = self.config.wake_ack_text.strip()
+        if not text:
+            self._cached_ack_text = None
+            self._cached_ack_segment = None
+            return
+        self._cached_ack_text = text
+        self._cached_ack_segment = self.ack_tts.synthesize(text)
 
     def run(self, *, once: bool = False, max_turns: int | None = None) -> RuntimeSummary:
         completed = 0
@@ -243,7 +255,7 @@ class LiveVoiceRuntime:
             return None
         try:
             self._event(ACK_STARTED, PipelineState.SPEAKING, f"应答中：{text}", turn_id=turn_id)
-            segment = self.ack_tts.synthesize(text)
+            segment = self._ack_segment(text)
             playback = self.transport.play_pcm(segment)
             if playback.error:
                 return playback.error
@@ -252,6 +264,12 @@ class LiveVoiceRuntime:
         except ProviderError as exc:
             return exc
 
+    def _ack_segment(self, text: str) -> AudioSegment:
+        if self._cached_ack_text != text or self._cached_ack_segment is None:
+            self._cached_ack_text = text
+            self._cached_ack_segment = self.ack_tts.synthesize(text)
+        return self._cached_ack_segment
+
     def _drain_input_after_playback(self) -> None:
         self.transport.flush_input()
         if self.config.post_playback_drain_ms <= 0: