update plot script to work on macos and linux

also add note for installing pip module

examples/device/audio_4_channel_mic/src/main.c

@@ -23,6 +23,14 @@
  *
  */
 
+/* plot_audio_samples.py requires following modules:
+ * $ sudo apt install libportaudio
+ * $ pip3 install sounddevice matplotlib
+ *
+ * Then run
+ * $ python3 plot_audio_samples.py
+ */
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>

examples/device/audio_4_channel_mic/src/plot_audio_samples.py

@@ -1,16 +1,24 @@
 import sounddevice as sd
 import matplotlib.pyplot as plt
 import numpy as np
+import platform
 
 if __name__ == '__main__':
 
-  #  Currently tested for Windows - on Linux try to find the device or use default device if not clearly listed
-  #  devList = sd.query_devices()
-  #  print(devList)
+    # If you got "ValueError: No input device matching", that is because your PC name example device
+    # differently from tested list below. Uncomment the next line to see full list and try to pick correct one
+    # print(sd.query_devices())
 
-    fs = 48000  												# Sample rate
-    duration = 100e-3                     						# Duration of recording
-    device = 'Microphone (MicNode_4_Ch), Windows WDM-KS' 		# WDM-KS is needed since there are more than one MicNode device APIs (at least in Windows)
+    fs = 48000  		# Sample rate
+    duration = 100e-3   # Duration of recording
+
+    if platform.system() == 'Windows':
+        # WDM-KS is needed since there are more than one MicNode device APIs (at least in Windows)
+        device = 'Microphone (MicNode_4_Ch), Windows WDM-KS'
+    elif platform.system() == 'Darwin':
+        device = 'MicNode_4_Ch'
+    else:
+        device ='default'
 
     myrecording = sd.rec(int(duration * fs), samplerate=fs, channels=4, dtype='int16', device=device)
     print('Waiting...')

examples/device/audio_test/src/main.c

@@ -23,6 +23,14 @@
  *
  */
 
+/* plot_audio_samples.py requires following modules:
+ * $ sudo apt install libportaudio
+ * $ pip3 install sounddevice matplotlib
+ *
+ * Then run
+ * $ python3 plot_audio_samples.py
+ */
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>

examples/device/audio_test/src/plot_audio_samples.py

@@ -1,15 +1,24 @@
 import sounddevice as sd
 import matplotlib.pyplot as plt
 import numpy as np
+import platform
 
 if __name__ == '__main__':
 
-  #  devList = sd.query_devices()
-  #  print(devList)
+    # If you got "ValueError: No input device matching", that is because your PC name example device
+    # differently from tested list below. Uncomment the next line to see full list and try to pick correct one
+    # print(sd.query_devices())
 
-    fs = 48000  # Sample rate
-    duration = 100e-3                     # Duration of recording
-    device = 'Microphone (MicNode) MME'   # MME is needed since there are more than one MicNode device APIs (at least in Windows)
+    fs = 48000           # Sample rate
+    duration = 100e-3    # Duration of recording
+
+    if platform.system() == 'Windows':
+        # MME is needed since there are more than one MicNode device APIs (at least in Windows)
+        device = 'Microphone (MicNode) MME'
+    elif platform.system() == 'Darwin':
+        device = 'MicNode'
+    else:
+        device ='default'
 
     myrecording = sd.rec(int(duration * fs), samplerate=fs, channels=1, dtype='int16', device=device)
     print('Waiting...')