moving things around and adding examples for mic hat code

mic_hat_examples/recording_examples/play.py

@@ -0,0 +1,36 @@
+import pyaudio
+import wave
+import sys
+
+# length of data to read.
+chunk = 1024
+RESPEAKER_INDEX = 1
+# validation. If a wave file hasn't been specified, exit.
+if len(sys.argv) < 2:
+    print("Plays a wave file.\n\n" + "Usage: %s filename.wav" % sys.argv[0])
+    sys.exit(-1)
+
+# open the file for reading.
+wf = wave.open(sys.argv[1], 'rb')
+
+# create an audio object
+p = pyaudio.PyAudio()
+
+# open stream based on the wave object which has been input.
+stream = p.open(format = p.get_format_from_width(wf.getsampwidth()),
+                channels = wf.getnchannels(),
+                rate = wf.getframerate(),
+                output = True,
+                output_device_index = RESPEAKER_INDEX)
+
+# read data (based on the chunk size)
+data = wf.readframes(chunk)
+# play stream (looping from beginning of file to the end)
+while data:
+    # writing to the stream is what *actually* plays the sound.
+    stream.write(data)
+    data = wf.readframes(chunk)
+
+# cleanup stuff.
+stream.close()    
+p.terminate()