Update app.py

app.py

@@ -71,10 +71,14 @@ def detect_emotion(text):
 def plot_waveform(audio_file):
     with wave.open(audio_file, 'r') as w:
         signal = np.frombuffer(w.readframes(w.getnframes()), dtype=np.int16)
+        framerate = w.getframerate()
+        duration = len(signal) / framerate
+        time = np.linspace(0., duration, len(signal))
+        
         plt.figure(figsize=(10, 4))
-        plt.plot(signal)
+        plt.plot(time, signal)
         plt.title("Audio Waveform")
-        plt.xlabel("Sample")
+        plt.xlabel("Duration (seconds)")
         plt.ylabel("Amplitude")
         st.pyplot(plt)