Add support for python-rtmidi

while keeping backwards compatibility to rtmidi-python

Author: dosas

README.md

@@ -12,7 +12,7 @@ Website: [www.samplerbox.org](https://www.samplerbox.org)
 
 # Install
 
-SamplerBox works with the RaspberryPi's built-in soundcard, but it is recommended to use a USB DAC (PCM2704 USB DAC for less than 10€ on eBay is fine) for better sound quality. 
+SamplerBox works with the RaspberryPi's built-in soundcard, but it is recommended to use a USB DAC (PCM2704 USB DAC for less than 10€ on eBay is fine) for better sound quality.
 
 You can use a ready-to-use ISO image from the [Releases](https://github.com/josephernest/SamplerBox/releases) page or do a manual install:
 
@@ -22,28 +22,38 @@ You can use a ready-to-use ISO image from the [Releases](https://github.com/jose
 
     ~~~
     sudo apt update
-    sudo apt -y install git python3-pip python3-smbus python3-numpy libportaudio2 
+    sudo apt -y install git python3-pip python3-smbus python3-numpy libportaudio2 libasound2-dev
     sudo apt -y install raspberrypi-kernel  # quite long to install, do it only if necessary, it solves a "no sound before 25 second on boot" problem
-    sudo pip3 install cython rtmidi-python cffi sounddevice pyserial
+    sudo pip3 install cython cffi sounddevice pyserial
     ~~~
-    
-2. Download SamplerBox and build it with:
+
+    For python < 3.9
+    ~~~
+    sudo pip3 install rtmidi-python
+    ~~~
+
+    For python >= 3.9
+    ~~~
+    sudo pip3 install python-rtmidi
+    ~~~
+
+1. Download SamplerBox and build it with:
 
     ~~~
     git clone https://github.com/josephernest/SamplerBox.git
     cd SamplerBox
     sudo python3 setup.py build_ext --inplace
     ~~~
 
-3. Reboot the Pi, and run the soft with: 
-    
+1. Reboot the Pi, and run the soft with:
+
     ~~~
     sudo python3 samplerbox.py
     ~~~
 
     Play some notes on the connected MIDI keyboard, you'll hear some sound!
 
-4. *(Optional)*  Modify `config.py` if you want to change root directory for sample-sets, default soundcard, etc.
+1. *(Optional)*  Modify `config.py` if you want to change root directory for sample-sets, default soundcard, etc.
 
 
 # How to use it

samplerbox.py

@@ -23,7 +23,12 @@
 import threading
 from chunk import Chunk
 import struct
-import rtmidi_python as rtmidi
+try:
+    import rtmidi_python as rtmidi
+    RTMIDI = False
+except ModuleNotFoundError:
+    import rtmidi
+    RTMIDI = True
 import samplerbox_audio
 
 #########################################
@@ -165,7 +170,18 @@ def AudioCallback(outdata, frame_count, time_info, status):
     b *= globalvolume
     outdata[:] = b.reshape(outdata.shape)
 
-def MidiCallback(message, time_stamp):
+
+def midi_callback(message, data=None):
+    message, deltatime = message
+
+    return midi_callback_common(message, None)
+
+
+def MidiCallback(message, timestamp):
+    return midi_callback_common(message, timestamp)
+
+
+def midi_callback_common(message, timestamp):
     global playingnotes, sustain, sustainplayingnotes
     global preset
     messagetype = message[0] >> 4
@@ -424,14 +440,27 @@ def MidiSerialCallback():
 # MAIN LOOP
 #########################################
 
-midi_in = [rtmidi.MidiIn(b'in')]
-previous = []
-while True:
-    for port in midi_in[0].ports:
-        if port not in previous and b'Midi Through' not in port:
-            midi_in.append(rtmidi.MidiIn(b'in'))
-            midi_in[-1].callback = MidiCallback
-            midi_in[-1].open_port(port)
-            print('Opened MIDI: ' + str(port))
-    previous = midi_in[0].ports
-    time.sleep(2)
+if RTMIDI:
+    midi_in = [rtmidi.MidiIn()]
+    previous = []
+    while True:
+        for num_port, port in enumerate(midi_in[0].get_ports()):
+            if port not in previous and 'Midi Through' not in port:
+                midi_in.append(rtmidi.MidiIn())
+                midi_in[-1].set_callback(midi_callback)
+                midi_in[-1].open_port(num_port)
+                print('Opened MIDI: ' + str(port))
+        previous = midi_in[0].get_ports()
+        time.sleep(2)
+else:
+    midi_in = [rtmidi.MidiIn(b'in')]
+    previous = []
+    while True:
+        for port in midi_in[0].ports:
+            if port not in previous and b'Midi Through' not in port:
+                midi_in.append(rtmidi.MidiIn(b'in'))
+                midi_in[-1].callback = MidiCallback
+                midi_in[-1].open_port(port)
+                print('Opened MIDI: ' + str(port))
+        previous = midi_in[0].ports
+        time.sleep(2)