You can use mpg123 for basic testing but it's a little clumsy for use where you want to dynamically change the volume or have an interactive program. For more powerful audio playback we suggest using PyGame to playback a variety of audio formats (MP3 included!)
Install PyGame
Start by installing pygame support, you'll need to open up a console on your Pi with network access and run:
sudo apt-get install python3-pygame
Next, download this pygame example zip to your Pi
On the command line, run
wget https://cdn-learn.adafruit.com/assets/assets/000/041/506/original/pygame_example.zip
unzip pygame_example.zip
Run Demo
Inside the zip is an example called pygameMP3.py
This example will playback all MP3's within the script's folder. To demonstrate that you can also adjust the volume within pygame, the second argument is the volume for playback. Specify a volume to playback with a command line argument between 0.0 and 1.0
For example here is how to play at 75% volume:
python pygameMP3.py 0.75
Here's the code if you have your own mp3s!
''' pg_midi_sound101.py
play midi music files (also mp3 files) using pygame
tested with Python273/331 and pygame192 by vegaseat
'''
#code modified by James DeVito from here: https://www.daniweb.com/programming/software-development/code/454835/let-pygame-play-your-midi-or-mp3-files
#!/usr/bin/python
import sys
import pygame as pg
import os
import time
def play_music(music_file):
'''
stream music with mixer.music module in blocking manner
this will stream the sound from disk while playing
'''
clock = pg.time.Clock()
try:
pg.mixer.music.load(music_file)
print("Music file {} loaded!".format(music_file))
except pygame.error:
print("File {} not found! {}".format(music_file, pg.get_error()))
return
pg.mixer.music.play()
# If you want to fade in the audio...
# for x in range(0,100):
# pg.mixer.music.set_volume(float(x)/100.0)
# time.sleep(.0075)
# # check if playback has finished
while pg.mixer.music.get_busy():
clock.tick(30)
freq = 44100 # audio CD quality
bitsize = -16 # unsigned 16 bit
channels = 2 # 1 is mono, 2 is stereo
buffer = 2048 # number of samples (experiment to get right sound)
pg.mixer.init(freq, bitsize, channels, buffer)
if len(sys.argv) > 1:
try:
user_volume = float(sys.argv[1])
except ValueError:
print "Volume argument invalid. Please use a float (0.0 - 1.0)"
pg.mixer.music.fadeout(1000)
pg.mixer.music.stop()
raise SystemExit
print("Playing at volume: " + str(user_volume)+ "\n")
pg.mixer.music.set_volume(user_volume)
mp3s = []
for file in os.listdir("."):
if file.endswith(".mp3"):
mp3s.append(file)
print mp3s
for x in mp3s:
try:
play_music(x)
time.sleep(.25)
except KeyboardInterrupt:
# if user hits Ctrl/C then exit
# (works only in console mode)
pg.mixer.music.fadeout(1000)
pg.mixer.music.stop()
raise SystemExit
else:
print("Please specify volume as a float! (0.0 - 1.0)")
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