"""Kokoro Engine adapter for the TTS Plugin Architecture. This module adapts the existing Kokoro backend to the new Engine/EngineSession protocol. It wraps the KokoroBackend without modifying it. """ from __future__ import annotations import logging from typing import Any, Iterator import numpy as np from abogen.tts_plugin.capabilities import VoiceLister from abogen.tts_plugin.engine import Engine, EngineSession from abogen.tts_plugin.errors import EngineError, InvalidInputError from abogen.tts_plugin.manifest import VoiceManifest from abogen.tts_plugin.types import ( AudioFormat, Duration, ParameterValues, SynthesisRequest, SynthesizedAudio, VoiceSelection, ) logger = logging.getLogger(__name__) # Kokoro voice list - source of truth _KOKORO_VOICES = ( "af_alloy", "af_aoede", "af_bella", "af_heart", "af_jessica", "af_kore", "af_nicole", "af_nova", "af_river", "af_sarah", "af_sky", "am_adam", "am_echo", "am_eric", "am_fenrir", "am_liam", "am_michael", "am_onyx", "am_puck", "am_santa", "bf_alice", "bf_emma", "bf_isabella", "bf_lily", "bm_daniel", "bm_fable", "bm_george", "bm_lewis", "ef_dora", "em_alex", "em_santa", "ff_siwis", "hf_alpha", "hf_beta", "hm_omega", "hm_psi", "if_sara", "im_nicola", "jf_alpha", "jf_gongitsune", "jf_nezumi", "jf_tebukuro", "jm_kumo", "pf_dora", "pm_alex", "pm_santa", "zf_xiaobei", "zf_xiaoni", "zf_xiaoxiao", "zf_xiaoyi", "zm_yunjian", "zm_yunxi", "zm_yunxia", "zm_yunyang", ) # Voice display names mapping _VOICE_DISPLAY_NAMES: dict[str, str] = { "af_alloy": "Alloy", "af_aoede": "Aoede", "af_bella": "Bella", "af_heart": "Heart", "af_jessica": "Jessica", "af_kore": "Kore", "af_nicole": "Nicole", "af_nova": "Nova", "af_river": "River", "af_sarah": "Sarah", "af_sky": "Sky", "am_adam": "Adam", "am_echo": "Echo", "am_eric": "Eric", "am_fenrir": "Fenrir", "am_liam": "Liam", "am_michael": "Michael", "am_onyx": "Onyx", "am_puck": "Puck", "am_santa": "Santa", "bf_alice": "Alice", "bf_emma": "Emma", "bf_isabella": "Isabella", "bf_lily": "Lily", "bm_daniel": "Daniel", "bm_fable": "Fable", "bm_george": "George", "bm_lewis": "Lewis", "ef_dora": "Dora", "em_alex": "Alex", "em_santa": "Santa", "ff_siwis": "Siwis", "hf_alpha": "Alpha", "hf_beta": "Beta", "hm_omega": "Omega", "hm_psi": "Psi", "if_sara": "Sara", "im_nicola": "Nicola", "jf_alpha": "Alpha", "jf_gongitsune": "Gongitsune", "jf_nezumi": "Nezumi", "jf_tebukuro": "Tebukuro", "jm_kumo": "Kumo", "pf_dora": "Dora", "pm_alex": "Alex", "pm_santa": "Santa", "zf_xiaobei": "Xiaobei", "zf_xiaoni": "Xiaoni", "zf_xiaoxiao": "Xiaoxiao", "zf_xiaoyi": "Xiaoyi", "zm_yunjian": "Yunjian", "zm_yunxi": "Yunxi", "zm_yunxia": "Yunxia", "zm_yunyang": "Yunyang", } # Sample rate for Kokoro audio _KOKORO_SAMPLE_RATE = 24000 class KokoroSession: """EngineSession implementation for Kokoro. Owns mutable execution state for synthesis. NOT thread-safe. """ def __init__(self, pipeline: Any, lang_code: str) -> None: self._pipeline = pipeline self._lang_code = lang_code self._disposed = False def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio: """Synthesize audio from text using Kokoro.""" if self._disposed: raise EngineError("Session disposed") try: voice = request.voice.key speed = request.parameters.values.get("speed", 1.0) split_pattern = request.parameters.values.get("split_pattern", None) audio_parts: list[np.ndarray] = [] for segment in self._pipeline( request.text, voice=voice, speed=speed, split_pattern=split_pattern, ): audio = segment.audio if hasattr(audio, "numpy"): audio = audio.numpy() audio_parts.append(np.asarray(audio, dtype="float32")) if not audio_parts: return SynthesizedAudio( data=b"", format=AudioFormat(mime="audio/wav", extension="wav"), duration=Duration(seconds=0.0), ) combined = np.concatenate(audio_parts).astype("float32", copy=False) audio_bytes = combined.tobytes() duration_seconds = len(combined) / _KOKORO_SAMPLE_RATE return SynthesizedAudio( data=audio_bytes, format=AudioFormat(mime="audio/wav", extension="wav"), duration=Duration(seconds=duration_seconds), ) except EngineError: raise except Exception as e: raise EngineError(f"Synthesis failed: {e}") from e def dispose(self) -> None: """Release session resources. Idempotent.""" self._disposed = True class KokoroEngine: """Engine implementation for Kokoro. Factory for KokoroSession instances. Stateless and thread-safe. """ def __init__(self, pipeline: Any, lang_code: str) -> None: self._pipeline = pipeline self._lang_code = lang_code self._disposed = False def createSession(self) -> KokoroSession: """Create a new KokoroSession.""" if self._disposed: raise EngineError("Engine disposed") return KokoroSession(self._pipeline, self._lang_code) def dispose(self) -> None: """Release engine resources. Idempotent.""" self._disposed = True def listVoices(self, sourceId: str) -> list[VoiceManifest]: """List available Kokoro voices. Implements VoiceLister capability.""" if self._disposed: raise EngineError("Engine disposed") return [ VoiceManifest( id=voice_id, name=_VOICE_DISPLAY_NAMES.get(voice_id, voice_id), tags=(_get_language_tag(voice_id), _get_gender_tag(voice_id)), ) for voice_id in _KOKORO_VOICES ] def _get_language_tag(voice_id: str) -> str: """Extract language tag from voice ID.""" prefix = voice_id.split("_")[0] lang_map = { "af": "en-us", "am": "en-us", "bf": "en-gb", "bm": "en-gb", "ef": "es", "em": "es", "ff": "fr", "hf": "hi", "hm": "hi", "if": "it", "im": "it", "jf": "ja", "jm": "ja", "pf": "pt", "pm": "pt", "zf": "zh", "zm": "zh", } return lang_map.get(prefix, "unknown") def _get_gender_tag(voice_id: str) -> str: """Extract gender tag from voice ID.""" prefix = voice_id.split("_")[0] if prefix.startswith("a") or prefix.startswith("b") or prefix.startswith("e"): return "female" if prefix[1] == "f" else "male" return "unknown"