Fix Gradio 4.x Audio compatibility on server

Only pass show_download_button and show_share_button when the installed Gradio Audio component supports them, fixing PM2 startup TypeError.

Co-authored-by: Cursor <cursoragent@cursor.com>

app.py

@@ -5,6 +5,7 @@ Gradio Web 中控：音色锁定 → Whisper 识别 → Gemma4 润色 → ChatTT
 
 from __future__ import annotations
 
+import inspect
 import logging
 import re
 import shutil
@@ -74,6 +75,22 @@ def ui_initial_history() -> tuple[dict, dict]:
     return gr.update(choices=choices, value=latest), ui_history_play(latest)
 
 
+def _tts_output_audio(label: str) -> gr.Audio:
+    """成品播放器：兼容 Gradio 4.x（无 show_download_button 等参数）。"""
+    kwargs: dict = {
+        "label": label,
+        "type": "filepath",
+        "interactive": False,
+        "elem_classes": ["tts-output-audio"],
+    }
+    params = inspect.signature(gr.Audio.__init__).parameters
+    if "show_download_button" in params:
+        kwargs["show_download_button"] = True
+    if "show_share_button" in params:
+        kwargs["show_share_button"] = False
+    return gr.Audio(**kwargs)
+
+
 # ---------------------------------------------------------------------------
 # 全局 UI 状态（Gradio State）
 # ---------------------------------------------------------------------------
@@ -1148,14 +1165,7 @@ def build_app() -> gr.Blocks:
                 with gr.Row(elem_classes=["pipeline-output-row"]):
                     pipe_raw = gr.Textbox(label="转写原文", lines=6)
                     pipe_polished = gr.Textbox(label="润色稿", lines=6)
-                pipe_output = gr.Audio(
-                    label="成品配音",
-                    type="filepath",
-                    interactive=False,
-                    show_download_button=True,
-                    show_share_button=False,
-                    elem_classes=["tts-output-audio"],
-                )
+                pipe_output = _tts_output_audio("成品配音")
 
             # ---- Tab 2: 分步流水线 ----
             with gr.Tab("🔧 分步流水线"):
@@ -1202,14 +1212,7 @@ def build_app() -> gr.Blocks:
                         )
                         synth_btn = gr.Button("🔊 合成配音 WAV", variant="primary")
                         synth_log = gr.Textbox(label="合成日志", lines=3, interactive=False)
-                        output_audio = gr.Audio(
-                            label="成品配音",
-                            type="filepath",
-                            interactive=False,
-                            show_download_button=True,
-                            show_share_button=False,
-                            elem_classes=["tts-output-audio"],
-                        )
+                        output_audio = _tts_output_audio("成品配音")
 
                 transcribe_btn.click(ui_transcribe, rec_audio, [raw_text, transcribe_log])
                 polish_btn.click(ui_polish, raw_text, [polished_text, polish_log])
@@ -1255,14 +1258,7 @@ def build_app() -> gr.Blocks:
                     scale=4,
                 )
                 history_refresh_btn = gr.Button("🔄 刷新", scale=0, min_width=100)
-            history_player = gr.Audio(
-                label="历史试听 / 下载",
-                type="filepath",
-                interactive=False,
-                show_download_button=True,
-                show_share_button=False,
-                elem_classes=["tts-output-audio"],
-            )
+            history_player = _tts_output_audio("历史试听 / 下载")
 
         history_refresh_btn.click(ui_history_dropdown, outputs=[history_select])
         history_select.change(ui_history_play, history_select, history_player)