"""TTS backends: speak(items=[(text, out_wav)], seed) in the cloned narrator voice.

local      — qwen-tts in this process on a CUDA GPU (any machine, the default);
media_node — an MCP server with generate_speech (the author's home GPU node; see media_node.py).
"""


def backend(cfg, ref_wav, ref_text):
    name = cfg.get("tts", "backend", "local")
    if name == "local":
        from .local import LocalTTS
        return LocalTTS(cfg, ref_wav, ref_text)
    if name == "media_node":
        from .media_node import MediaNodeTTS
        return MediaNodeTTS(cfg)
    raise SystemExit(f"unknown tts.backend {name!r}")