Update app.py

app.py

@@ -1,25 +1,70 @@
 import streamlit as st
 import streamlit.components.v1 as components
-import rtmidi
 import json
 from pathlib import Path
 import time
+import subprocess
+import sys
 
-def create_midi_output():
-    """Initialize MIDI output"""
-    midi_out = rtmidi.MidiOut()
-    available_ports = midi_out.get_ports()
+def check_midi_prerequisites():
+    """Check and report MIDI system status"""
+    issues = []
+    solutions = []
     
-    if available_ports:
-        st.sidebar.write("Available MIDI ports:", available_ports)
-        selected_port = st.sidebar.selectbox("Select MIDI Output", range(len(available_ports)), 
-                                           format_func=lambda x: available_ports[x])
-        midi_out.open_port(selected_port)
-    else:
-        st.sidebar.warning("No MIDI output ports available")
-        midi_out.open_virtual_port("Virtual MIDI Output")
+    try:
+        import rtmidi
+    except ImportError:
+        issues.append("python-rtmidi is not installed")
+        solutions.append("pip install python-rtmidi")
+    except OSError as e:
+        issues.append(f"MIDI system error: {str(e)}")
+        solutions.extend([
+            "sudo apt-get install libasound2-dev",
+            "sudo apt-get install alsa-utils",
+            "sudo modprobe snd-seq-midi"
+        ])
     
-    return midi_out
+    if issues:
+        st.error("MIDI System Issues Detected")
+        st.write("Problems found:")
+        for issue in issues:
+            st.write(f"- {issue}")
+            
+        st.write("Try these solutions:")
+        for solution in solutions:
+            st.code(solution)
+            
+        st.write("After installing prerequisites, restart the application.")
+        return False
+    return True
+
+def create_midi_output():
+    """Initialize MIDI output with fallback options"""
+    try:
+        import rtmidi
+        midi_out = rtmidi.MidiOut()
+        available_ports = midi_out.get_ports()
+        
+        if available_ports:
+            st.sidebar.write("Available MIDI ports:", available_ports)
+            selected_port = st.sidebar.selectbox(
+                "Select MIDI Output", 
+                range(len(available_ports)), 
+                format_func=lambda x: available_ports[x]
+            )
+            midi_out.open_port(selected_port)
+        else:
+            st.sidebar.warning("No hardware MIDI ports found. Creating virtual port.")
+            try:
+                midi_out.open_virtual_port("Virtual MIDI Output")
+            except rtmidi.SystemError:
+                st.sidebar.error("Could not create virtual MIDI port. Running in simulation mode.")
+                return None
+        return midi_out
+    except Exception as e:
+        st.sidebar.error(f"MIDI system unavailable: {str(e)}")
+        st.sidebar.info("Running in simulation mode (no MIDI output)")
+        return None
 
 def get_piano_html():
     """Return the HTML content for the piano keyboard"""
@@ -128,6 +173,10 @@ def main():
     st.title("MIDI Piano Keyboard")
     st.write("Click keys or use your computer keyboard (A-K and W-U for white and black keys)")
     
+    # Check MIDI prerequisites
+    if not check_midi_prerequisites():
+        return
+    
     # Initialize MIDI output
     midi_out = create_midi_output()
     
@@ -146,6 +195,14 @@ def main():
         st.session_state.midi_events = []
     
     def handle_midi_event(event):
+        if midi_out is None:
+            # Simulation mode - just display the events
+            if event['type'] == 'noteOn':
+                midi_message_placeholder.write(f"Simulated Note On: {event['note']} (No MIDI Output)")
+            else:
+                midi_message_placeholder.write(f"Simulated Note Off: {event['note']} (No MIDI Output)")
+            return
+            
         if event['type'] == 'noteOn':
             midi_out.send_message([0x90, event['note'], event['velocity']])
             midi_message_placeholder.write(f"Note On: {event['note']}")
@@ -172,15 +229,6 @@ def main():
         """,
         height=0
     )
-    
-    # Add a loop to continuously check for new MIDI events
-    while True:
-        time.sleep(0.1)  # Small delay to prevent excessive CPU usage
-        
-        # Process any pending MIDI events
-        for event in st.session_state.midi_events:
-            handle_midi_event(event)
-        st.session_state.midi_events = []
 
 if __name__ == "__main__":
     main()