update default parameters + python updates

- by default ggwave will now output 32-bit float samples
- python samples no longer use numpy
- python test now decodes payload
- fix buffer overflow in receive.py example

examples/ggwave-py/receive.py

@@ -10,7 +10,7 @@ instance = ggwave.init()
 
 try:
     while True:
-        data = stream.read(1024)
+        data = stream.read(1024, exception_on_overflow=False)
         res = ggwave.decode(instance, data)
         if (not res is None):
             try:

examples/ggwave-py/send.py

@@ -1,6 +1,5 @@
 import ggwave
 import pyaudio
-import numpy as np
 
 p = pyaudio.PyAudio()
 
@@ -8,9 +7,8 @@ p = pyaudio.PyAudio()
 waveform = ggwave.encode("hello python", txProtocolId = 1, volume = 20)
 
 print("Transmitting text 'hello python' ...")
-stream = p.open(format=pyaudio.paInt16, channels=1, rate=48000, output=True, frames_per_buffer=4096)
-stream.write(np.array(waveform).astype(np.int16), len(waveform))
-stream.write(np.zeros(16*1024), 16*1024) # short silence at the end
+stream = p.open(format=pyaudio.paFloat32, channels=1, rate=48000, output=True, frames_per_buffer=4096)
+stream.write(waveform, len(waveform)//4)
 stream.stop_stream()
 stream.close()