app.py

import gradio as gr
from openai import OpenAI
import os
from datetime import datetime
from zoneinfo import ZoneInfo

auto_play_bl = {'ON': True, 'OFF': False}
voice_list = ["alloy", "echo", "fable", "onyx", "nova", "shimmer"]

def set_state(state, openai_key, voice, auto_play, speed):

    state["openai_key"] = openai_key
    state["voice"] = voice
    state["auto_play"] = auto_play_bl[auto_play]
    state["speed"] = speed

    return state

def create_voice(state, text, file):

    err_msg = ""

    # セッション情報取得
    client = state["client"]
    user_id = state["user_id"]
    voice = state["voice"]
    speed = state["speed"]

    # OpenAIキーチェック
    if state["openai_key"] == "":

        err_msg = "OpenAIキーを入力してください。（設定タブ）"

        return None, err_msg

    # ファイル入力チェック
    if text.strip() == "" and file is None:

        err_msg = "画面から文章を入力するか、テキストファイルをアップして下さい。"

        return None, err_msg

    if client is None:

        os.environ["OPENAI_API_KEY"] = state["openai_key"]

        # クライアント作成
        client = OpenAI()

        # client作成後は消す
        os.environ["OPENAI_API_KEY"] = ""

        state["client"] = client

    if user_id == "":

        # IDとして現在時刻をセット
        dt = datetime.now(ZoneInfo("Asia/Tokyo"))
        user_id = dt.strftime("%Y%m%d%H%M%S")

        # ユーザIDでフォルダ作成
        os.makedirs(user_id, exist_ok=True)

        state["user_id"] = user_id

    if file:

        with open(file, 'r') as f:

            input_text = f.read()

    else:

        input_text = text

    # ファイル名は現在時刻
    dt = datetime.now(ZoneInfo("Asia/Tokyo"))
    file_name = dt.strftime("%Y%m%d%H%M%S") + ".mp3"
    file_path = user_id + "/" + file_name

    # 音声にする
    result = request_tts(client, voice, speed, file_path, input_text)

    if result != "":
        err_msg = result
        file_path = None

    return file_path, err_msg

def request_tts(client, voice , speed, file_path, text):
    """ テキストを音声にする """

    err_msg = ""

    try:

      response = client.audio.speech.create(
          model= "tts-1",   # "tts-1-hd",
          voice=voice,
          input=text,
          speed=speed
      )

      # 音声ファイルに出力
      response.stream_to_file(file_path)

    except Exception as e:
        err_msg = "音声作成中にエラーが発生しました。"
        print(e)
    finally:
        return err_msg

with gr.Blocks() as demo:

    title = "<h2>Text to Speechデモアプリ</h2>"
    message = "<h3>最初に[設定]タブからOpenAIキーを入力してください。"
    message += "</h3>"

    gr.Markdown(title + message)

    state = gr.State({
        "openai_key" : "",
        "client" : None,
        "user_id" : "",
        "auto_play" : True,
        "speed" : 0.8,
        "voice" : "nova"
    })

    with gr.Tab("音声にする") as main_tab:

        text = gr.Textbox(label="音声にするテキスト", lines=3, interactive = True)
        file = gr.File(label="入力ファイル", type="filepath",file_types=[".txt"], interactive = True)

        with gr.Row():
            btn = gr.Button("音声にする")
            clear = gr.ClearButton([text, file], value="クリア")

        sys_msg = gr.Text(label="システムメッセージ", interactive = False)
        voice = gr.Audio(label="出力音声", type="filepath", interactive = False, autoplay = True)

        btn.click(create_voice, [state, text, file], [voice, sys_msg])

    with gr.Tab("設定") as set_tab:
        openai_key = gr.Textbox(label="OpenAI API Key", interactive = True)
        voice = gr.Dropdown(choices=voice_list, value = "nova", label="Voice", interactive = True)
        auto_play = gr.Dropdown(choices=["ON", "OFF"], value = "ON", label="Auto Play", interactive = True)
        speed = gr.Slider(0, 1, value=0.8, label="Speed", info="1に近づけるほど読むスピードが速くなります。", interactive = True)

        # 設定変更時
        main_tab.select(set_state, [state, openai_key, voice, auto_play, speed], state)

    with gr.Tab("声サンプル") as voice_chk:

        gr.Markdown("<h3>Text to speechの声のサンプルです。（速度は0.8です）</h3>")

        with gr.Row():
            btn_alloy = gr.Button(value="alloy")
            btn_echo = gr.Button(value="echo")
            btn_fable = gr.Button(value="fable")

        with gr.Row():
            btn_onyx = gr.Button(value="onyx")
            btn_nova = gr.Button(value="nova")
            btn_shimmer = gr.Button(value="shimmer")

        sample_voice=gr.Audio(type="filepath", interactive = False, autoplay = True)

        btn_alloy.click(lambda:"voice_sample/alloy.mp3", None, sample_voice)
        btn_echo.click(lambda:"voice_sample/echo.mp3", None, sample_voice)
        btn_fable.click(lambda:"voice_sample/fable.mp3", None, sample_voice)
        btn_onyx.click(lambda:"voice_sample/onyx.mp3", None, sample_voice)
        btn_nova.click(lambda:"voice_sample/nova.mp3", None, sample_voice)
        btn_shimmer.click(lambda:"voice_sample/shimmer.mp3", None, sample_voice)

demo.queue()
demo.launch(debug=False)