Fix TTS synthesis UI stuck on loading state

Enable Gradio queue, immediate pending feedback, segment progress, and gr.update for Audio so long syntheses show logs and playback correctly.

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

app.py

@@ -141,14 +141,40 @@ def _short_synth_log(msg: str, ok: bool) -> str:
     return "✅ 配音完成。请用下方播放器试听、下载。"
 
 
-def ui_synthesize(polished_text: str, voice_label: str) -> tuple[str, str | None]:
-    """【TTS 合成】生成最终 wav 配音文件。先更新日志再更新播放器，减轻闪屏。"""
+def ui_synth_pending(polished_text: str) -> tuple[str, dict]:
+    """点击合成后立即反馈，避免长时间无日志更新被误认为卡死。"""
+    text = (polished_text or "").strip()
+    if not text:
+        return "请先完成 Gemma4 润色。", gr.update(value=None)
+    est_sec = max(20, len(text) // 10)
+    return (
+        f"⏳ 配音合成中（约 {len(text)} 字，预计 {est_sec}–{est_sec + 45} 秒），请勿重复点击…",
+        gr.update(value=None),
+    )
+
+
+def ui_synthesize(
+    polished_text: str,
+    voice_label: str,
+    progress: gr.Progress = gr.Progress(),
+) -> tuple[str, dict]:
+    """【TTS 合成】生成最终 wav 配音文件。"""
     if not polished_text or not polished_text.strip():
-        return "请先完成 Gemma4 润色。", None
+        return "请先完成 Gemma4 润色。", gr.update(value=None)
 
     voice_id = label_to_voice_id(voice_label)
-    ok, msg, wav_path = generate_voice(polished_text, voice_id=voice_id)
-    return _short_synth_log(msg, ok), wav_path if ok else None
+
+    def _report_segment(seg: int, total: int) -> None:
+        progress((seg - 1) / max(total, 1), desc=f"ChatTTS 第 {seg}/{total} 段…")
+
+    ok, msg, wav_path = generate_voice(
+        polished_text,
+        voice_id=voice_id,
+        progress_callback=_report_segment,
+    )
+    if ok:
+        return _short_synth_log(msg, ok), gr.update(value=wav_path)
+    return _short_synth_log(msg, ok), gr.update(value=None)
 
 
 # ---------------------------------------------------------------------------
@@ -173,10 +199,10 @@ def ui_full_pipeline(
     else:
         path = _save_upload(audio_file)
         if not path:
-            return "", "", None, "❌ 请上传录音或手动填写转写文本。"
+            return "", "", gr.update(value=None), "❌ 请上传录音或手动填写转写文本。"
         ok, result = transcribe_audio(path)
         if not ok:
-            return "", "", None, f"❌ 识别失败: {result}"
+            return "", "", gr.update(value=None), f"❌ 识别失败: {result}"
         raw = result
         logs.append(f"✅ Whisper 识别完成（{len(raw)} 字）。")
 
@@ -187,7 +213,7 @@ def ui_full_pipeline(
     else:
         ok, result = polish_text(raw)
         if not ok:
-            return raw, "", None, f"❌ 润色失败: {result}\n" + "\n".join(logs)
+            return raw, "", gr.update(value=None), f"❌ 润色失败: {result}\n" + "\n".join(logs)
         polished = result
         logs.append(f"✅ Gemma4 润色完成（{len(polished)} 字）。")
 
@@ -195,10 +221,10 @@ def ui_full_pipeline(
     voice_id = label_to_voice_id(voice_label)
     ok, msg, wav_path = generate_voice(polished, voice_id=voice_id)
     if not ok:
-        return raw, polished, None, f"❌ 合成失败: {msg}\n" + "\n".join(logs)
+        return raw, polished, gr.update(value=None), f"❌ 合成失败: {msg}\n" + "\n".join(logs)
 
     logs.append(f"✅ {msg}")
-    return raw, polished, wav_path, "\n".join(logs)
+    return raw, polished, gr.update(value=wav_path), "\n".join(logs)
 
 
 # ---------------------------------------------------------------------------
@@ -1116,10 +1142,15 @@ def build_app() -> gr.Blocks:
                 transcribe_btn.click(ui_transcribe, rec_audio, [raw_text, transcribe_log])
                 polish_btn.click(ui_polish, raw_text, [polished_text, polish_log])
                 synth_btn.click(
+                    ui_synth_pending,
+                    [polished_text],
+                    [synth_log, output_audio],
+                    queue=True,
+                ).then(
                     ui_synthesize,
                     [polished_text, tts_voice],
                     [synth_log, output_audio],
-                    show_progress="hidden",
+                    queue=True,
                 )
 
             # ---- Tab 3: 一键生产 ----
@@ -1156,12 +1187,26 @@ def build_app() -> gr.Blocks:
                     pipe_polished = gr.Textbox(label="润色稿", lines=6)
                 pipe_output = gr.Audio(label="成品配音", type="filepath")
 
+                def ui_pipeline_pending(skip_polish: bool, manual_raw: str) -> tuple[str, dict]:
+                    if manual_raw and manual_raw.strip():
+                        return "⏳ 全流程运行中（识别/润色/合成），请稍候…", gr.update(value=None)
+                    if skip_polish:
+                        return "⏳ 全流程运行中（识别→合成），请稍候…", gr.update(value=None)
+                    return "⏳ 全流程运行中（识别→润色→合成），请稍候…", gr.update(value=None)
+
                 pipeline_btn.click(
+                    ui_pipeline_pending,
+                    [skip_polish_cb, pipe_manual],
+                    [pipeline_log, pipe_output],
+                    queue=True,
+                ).then(
                     ui_full_pipeline,
                     [pipe_audio, skip_polish_cb, pipe_manual, pipe_voice],
                     [pipe_raw, pipe_polished, pipe_output, pipeline_log],
+                    queue=True,
                 )
 
+    demo.queue(default_concurrency_limit=1)
     return demo