add a proof of concept TTS implementation on Mac

qt/aqt/sound.py

@@ -647,6 +647,10 @@ def setup_audio(base_folder: str) -> None:
         mpv.args.append("--include=" + base_folder)
         av_player.players.append(mpv)
 
+    if isMac:
+        from aqt.tts import MacTTSPlayer
+
+        av_player.players.append(MacTTSPlayer())
 
 # Legacy audio interface
 ##########################################################################

qt/aqt/tts.py

@@ -0,0 +1,42 @@
+"""
+todo
+"""
+
+import subprocess
+from concurrent.futures import Future
+from typing import Callable, cast
+
+from anki.sound import AVTag, TTSTag
+from aqt.sound import OnDoneCallback, Player
+from aqt.taskman import TaskManager
+
+
+class TTSPlayer(Player):  # pylint: disable=abstract-method
+    def can_play(self, tag: AVTag) -> bool:
+        return isinstance(tag, TTSTag)
+
+
+class MacTTSPlayer(TTSPlayer):
+    _taskman = TaskManager()
+
+    def play(self, tag: AVTag, on_done: Callable[[], None]) -> None:
+        ttag = cast(TTSTag, tag)
+        self._taskman.run(
+            lambda: self._play(ttag), lambda ret: self._on_done(ret, on_done)
+        )
+
+    def _play(self, tag: TTSTag) -> None:
+        ret = subprocess.run(
+            ["say", "-v", "Alex", "-f", "-"],
+            input=tag.text,
+            encoding="utf8",
+            check=True,
+        )
+
+    def _on_done(self, ret: Future, cb: OnDoneCallback) -> None:
+        # will raise on error
+        ret.result()
+        cb()
+
+    def stop(self):
+        pass