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import streamlit as st
import streamlit.components.v1 as components
import subprocess
import time
import os
import threading
from queue import Queue
import json
import mido
# ------------------------------------------------------------
# Utility Functions
# ------------------------------------------------------------
def install_fluidsynth():
"""
Check if 'fluidsynth' CLI is installed. Attempt to install if not found.
On non-Linux systems, you’ll need to manually install fluidsynth.
"""
try:
subprocess.run(['fluidsynth', '--version'], capture_output=True, check=True)
return True
except (FileNotFoundError, subprocess.CalledProcessError):
st.error("FluidSynth not found. Attempting automatic install (Linux only).")
try:
subprocess.run(['sudo', 'apt-get', 'update'], check=True)
subprocess.run(['sudo', 'apt-get', 'install', '-y', 'fluidsynth'], check=True)
return True
except subprocess.CalledProcessError as e:
st.error(f"Failed to install FluidSynth automatically: {str(e)}")
st.code("Please install fluidsynth manually.")
return False
def download_soundfont(sf_filename="GeneralUser_GS_v1.471.sf2"):
"""
Downloads a free SoundFont if it's not already present.
"""
if not os.path.exists(sf_filename):
st.info("Downloading soundfont...")
try:
subprocess.run([
'wget',
'https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/musicbox/GeneralUser%20GS%20v1.471.sf2',
'-O',
sf_filename
], check=True)
except subprocess.CalledProcessError as e:
st.error(f"Failed to download soundfont: {str(e)}")
return False
return True
# ------------------------------------------------------------
# FluidSynth Handling Class
# ------------------------------------------------------------
class FluidSynthPlayer:
"""
Wraps the fluidsynth CLI process, sends commands (like note on/off).
"""
def __init__(self, soundfont_path, gain=2.0, audio_driver='pulseaudio'):
self.soundfont_path = soundfont_path
self.process = None
self.running = False
self.event_queue = Queue()
self.gain = str(gain)
self.audio_driver = audio_driver
def start(self):
"""Start FluidSynth as a subprocess."""
try:
self.process = subprocess.Popen(
[
'fluidsynth',
'-a', self.audio_driver,
'-g', self.gain,
self.soundfont_path
],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=True,
bufsize=1
)
self.running = True
threading.Thread(target=self._process_events, daemon=True).start()
return True
except Exception as e:
st.error(f"Failed to start FluidSynth: {str(e)}")
return False
def stop(self):
"""Stop the FluidSynth process."""
self.running = False
if self.process:
self.process.terminate()
self.process.wait()
def _process_events(self):
"""Thread to process MIDI events from queue and send to fluidsynth."""
while self.running:
try:
event = self.event_queue.get(timeout=0.1)
msg_type = event['type']
if msg_type == 'noteOn':
self._send_command(f"noteon 0 {event['note']} {event['velocity']}")
elif msg_type == 'noteOff':
self._send_command(f"noteoff 0 {event['note']}")
except:
continue
def _send_command(self, command):
"""Send a textual command to fluidsynth."""
if self.process and self.process.poll() is None:
try:
self.process.stdin.write(command + '\n')
self.process.stdin.flush()
except:
pass
def queue_event(self, event):
"""Add a MIDI event to the fluidsynth queue."""
self.event_queue.put(event)
# ------------------------------------------------------------
# Basic Arpeggiator
# ------------------------------------------------------------
class Arpeggiator:
"""
A simple arpeggiator that cycles through held notes at a certain speed.
"""
def __init__(self, synth_player, bpm=120):
self.synth_player = synth_player
self.bpm = bpm
self.notes_held = set()
self.thread = None
self.running = False
def start(self):
if self.running:
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