# Python program pa_wave.py (AHG, 2024)
import os, pyaudio, sys, wave
#
# check commandline argument for audio file
if len(sys.argv) > 2:
    sys.exit("Error: too many arguments")
if len(sys.argv) < 2:
    afl = 'voice.wav' # default audio file
else:
    afl = sys.argv[1]
#
# initialize PyAudio and data stream
p = pyaudio.PyAudio() # PortAudio interface
wf = wave.open(afl, 'rb') # open audio file
chs = wf.getnchannels()
swi = wf.getsampwidth()
fmt = p.get_format_from_width(swi)
fra = wf.getnframes()
rat = wf.getframerate()
dur = fra / float(rat)
stream = p.open( # open stream object
                 rate = rat,
             channels = chs,
               format = fmt,
               output = True,
  output_device_index = None
# PyAudio device index (can direct the output to
# USB soundcard or headphones), None for default
)
#
# clear the screen and print info
os.system('clear')
print(__file__)
print("playing", afl)
if chs==1: print("1 audio channel (mono)")
if chs==2: print("2 audio channels (stereo)")
print("audio sample width:",swi,"bytes")
print("number of audio frames:",fra)
print("frame rate:",rat,"per s")
print("duration:",round(dur,1),"s")
#
# play by writing audio data to stream
chk = 4096 # 4096 samples per data frame
dat = wf.readframes(chk) # read data
while dat:
    stream.write(dat)
    dat = wf.readframes(chk)
#
# final cleanup
wf.close()
stream.close()
p.terminate()