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app.py

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+import gradio as gr
+import requests
+from gtts import gTTS
+import tempfile
+import os
+
+# 🔑 OpenRouter API key (Replace this securely in HF secrets later)
+OPENROUTER_API_KEY = "YOUR_API_KEY"
+
+# 🧠 Get AI response
+def get_ai_response(user_input):
+    url = "https://openrouter.ai/api/v1/chat/completions"
+    headers = {
+        "Authorization": f"Bearer {OPENROUTER_API_KEY}",
+        "Content-Type": "application/json"
+    }
+
+    data = {
+        "model": "mistralai/mistral-7b-instruct:free",
+        "max_tokens": 100,
+        "temperature": 0.7,
+        "messages": [
+            {"role": "system", "content": "You are a helpful and friendly AI assistant. Keep answers short."},
+            {"role": "user", "content": user_input}
+        ]
+    }
+
+    response = requests.post(url, headers=headers, json=data)
+    if response.ok:
+        result = response.json()
+        return result["choices"][0]["message"]["content"]
+    else:
+        return "⚠️ OpenRouter error"
+
+# 🎙️ Speech-to-text → AI → Text-to-speech
+def process_audio(audio):
+    if audio is None:
+        return "No audio provided", None
+
+    import speech_recognition as sr
+    recognizer = sr.Recognizer()
+    with sr.AudioFile(audio) as source:
+        audio_data = recognizer.record(source)
+        try:
+            text = recognizer.recognize_google(audio_data)
+        except:
+            return "Sorry, I couldn't understand you.", None
+
+    ai_response = get_ai_response(text)
+
+    # 🔊 Convert to speech
+    tts = gTTS(text=ai_response, lang="en")
+    with tempfile.NamedTemporaryFile(delete=False, suffix=".mp3") as f:
+        tts.save(f.name)
+        return ai_response, f.name
+
+# 🖼️ Gradio UI
+demo = gr.Interface(
+    fn=process_audio,
+    inputs=gr.Audio(source="microphone", type="filepath", label="🎙️ Speak now"),
+    outputs=[
+        gr.Text(label="🧠 AI Response"),
+        gr.Audio(label="🔊 AI Voice")
+    ],
+    title="🎤 Voice Assistant with OpenRouter AI",
+    description="Speak your question. The AI will respond by voice."
+)
+
+demo.launch()

requirements.txt

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+gradio
+gTTS
+requests
+speechrecognition