Error Playback wav file in python script

Hey all, I am facing a problem playing back wav/audio files in python on my raspberry pi + cirrus logic audio card setup. The file being played back is always buzzing and full of distortion. This problem is only faced when I ran the playback script on python, and the playback is normal using aplay-. Can anyone advice me on this?

Below is the playback python code. Please help me to see if everything is fine. Thanks.

def playAudio():

import pyaudio

import wave

CHUNK = 1024

wf = wave.open('White_Noise.wav', 'rb')

p = pyaudio.PyAudio()

stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),

channels=wf.getnchannels(),

rate=wf.getframerate(),

output=True)

data = wf.readframes(CHUNK)

while data != '':

stream.write(data)

data = wf.readframes(CHUNK)

stream.stop_stream()

stream.close()

p.terminate()

clem57 over 8 years ago

Instead of blocking mode, try callback mode

"""PyAudio Example: Play a wave file (callback version)."""

import pyaudio
import wave
import time
import sys

if len(sys.argv) < 2:
   print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
   sys.exit(-1)

wf = wave.open(sys.argv[1], 'rb')

# instantiate PyAudio (1)
p = pyaudio.PyAudio()

# define callback (2)
def callback(in_data, frame_count, time_info, status):
   data = wf.readframes(frame_count)
   return (data, pyaudio.paContinue)

# open stream using callback (3)
stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
   channels=wf.getnchannels(),
   rate=wf.getframerate(),
   output=True,
   stream_callback=callback)

# start the stream (4)
stream.start_stream()

# wait for stream to finish (5)
while stream.is_active():
   time.sleep(0.1)

# stop stream (6)
stream.stop_stream()
stream.close()
wf.close()

# close PyAudio (7)
p.terminate()
Cancel
Vote Up +1 Vote Down

Sign in to reply

Cancel