Linux : Virtual device creation and routing microphone audio via a python script

.gitignore

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+#Temporary work files 
+linux/initial
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

linux/README.md

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+### Step 1: 
+Run the script with the command:
+    `$ python3 dynopii.py`
+
+### Step 2: (only for first time use)
+In the "Playback" tab of the pavucontrol window that opens, and make sure that the playback device for the running "ALSA plug-in[aplay]: ALSA Playback _on_" is 'dynopii'. 
+
+#
+To close this, stop the script using `Ctrl-C` and it will also delete the virtual device module and stop the playback.

linux/dynopii.py

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+import subprocess
+import audioop
+
+try:    
+
+    print('#' * 80)
+    print('Initiating dynopii virtual audio cable ... ')
+    loadcmd = ['pacmd', 'load-module', 'module-null-sink', 'sink_name=dynopii_sink', 'sink_properties=device.description=dynopii']
+    subprocess.Popen(loadcmd)
+    subprocess.Popen('pavucontrol')
+
+    cmd0 = ['arecord', '-f', 'cd', '-']
+    p0 = subprocess.Popen(cmd0, stdout=subprocess.PIPE) 
+
+    '''
+    This stdout of p0 is basically the data we get from arecord, and the data that we can manipulate on the fly and then
+    feed to the stdin of the next process p1. 
+    If you will work on this, you'll have to replace the stdin=p0.stdout of the following process p1 with your manipulated data.
+    '''
+
+    cmd1 = ['aplay', '-f', 'cd', '-']
+    p1 = subprocess.Popen(cmd1, stdin=p0.stdout)
+    print('')
+    print('To quit this program and close your virtual device, press Ctrl-C')
+    print('')
+    print('#' * 80)
+    input()
+
+except EOFError:
+    print('EOF Error')
+
+except KeyboardInterrupt:
+    print()
+    print('Closing the virtual audio cable ....')
+    print('Unloading null-sinks ...')
+    print('Stopping playback ...')
+
+    uncmd0 = ['pactl', 'list', 'short', 'modules']
+    uncmd1 = ['grep', 'sink_name=dynopii']
+    uncmd2 = [ 'cut', '-f1' ]
+    uncmd3 = [ 'xargs', '-L1', 'pactl', 'unload-module' ]
+
+    unp0 = subprocess.Popen(uncmd0, stdout=subprocess.PIPE)
+    unp1 = subprocess.Popen(uncmd1, stdin=unp0.stdout, stdout=subprocess.PIPE)
+    unp2 = subprocess.Popen(uncmd2, stdin=unp1.stdout, stdout=subprocess.PIPE)
+    unp3 = subprocess.Popen(uncmd3, stdin=unp2.stdout)
+
+    killcmd = ['pkill', 'arecord']  #kill arecord (hence killing ALSA playback since aplay simultaneously stops receiving input via the pipe)
+    closefin = subprocess.Popen(killcmd)