Update app.py

app.py

@@ -130,14 +130,15 @@ with gr.Blocks() as demo:
     
     voice_dict = asyncio.run(get_voice_list())
     languages = list(voice_dict.keys())
+    languages.insert(0, "None")  # Add "None" option for single speaker
     
     with gr.Row():
         lang1_select = gr.Dropdown(label="Select Language 1", choices=[f"{language_names.get(lang, lang)}" for lang in languages], value="English (United States)")
-        voice1_select = gr.Dropdown(label="Select Voice 1")
+        voice1_select = gr.Dropdown(label="Select Voice 1", value="Microsoft Server Speech Text to Speech Voice (en-US, AvaNeural)")
     
     with gr.Row():
-        lang2_select = gr.Dropdown(label="Select Language 2", choices=[f"{language_names.get(lang, lang)}" for lang in languages], value="English (United States)")
-        voice2_select = gr.Dropdown(label="Select Voice 2")
+        lang2_select = gr.Dropdown(label="Select Language 2", choices=[f"{language_names.get(lang, lang)}" for lang in languages], value="None")
+        voice2_select = gr.Dropdown(label="Select Voice 2", value="Microsoft Server Speech Text to Speech Voice (en-US, AndrewNeural)")
     
     generate_btn = gr.Button("Generate Script")
     script_output = gr.Textbox(label="Generated Script", lines=10)
@@ -146,6 +147,8 @@ with gr.Blocks() as demo:
     audio_output = gr.Audio(label="Generated Podcast")
     
     def update_voices(lang):
+        if lang == "None":
+            return gr.Dropdown(choices=[], value=None)
         selected_lang = next((key for key, value in language_names.items() if value == lang), None)
         voices = voice_dict.get(selected_lang, [])
         return gr.Dropdown(choices=voices, value=voices[0] if voices else None)
@@ -157,7 +160,11 @@ with gr.Blocks() as demo:
         return generate_podcast_script(api_key, content, duration)
     
     async def render_podcast_wrapper(api_key, script, voice1, voice2):
-        return await render_podcast(api_key, script, voice1, voice2)
+        if voice2 is None or lang2_select.value == "None":
+            # Use only voice1 for all lines
+            return await render_podcast(api_key, script, voice1, voice1)
+        else:
+            return await render_podcast(api_key, script, voice1, voice2)
     
     generate_btn.click(generate_script_wrapper, inputs=[api_key_input, content_input, duration], outputs=script_output)
     render_btn.click(render_podcast_wrapper, inputs=[api_key_input, script_output, voice1_select, voice2_select], outputs=audio_output)