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#!/usr/bin/env python
"""A simple music player.
Use pygame.mixer.music to play an audio file. A window is
created to handle keyboard events for playback commands.
"""
from __future__ import print_function
import pygame
import pygame.freetype
from pygame.locals import *
import sys
import os
class Window(object):
"""The application's Pygame window
A Window instance manages the creation of and drawing to a
window. It is a singleton class. Only one instance can exist.
"""
instance = None
def __new__(cls, *args, **kwds):
"""Return an open Pygame window"""
if Window.instance is not None:
return Window.instance
self = object.__new__(cls)
pygame.display.init()
self.screen = pygame.display.set_mode((600, 400))
Window.instance = self
return self
def __init__(self, title):
pygame.display.set_caption(title)
self.screen.fill(Color('white'))
pygame.display.flip()
pygame.freetype.init()
self.font = pygame.freetype.Font(None, 20)
self.font.origin = True
self.ascender = int(self.font.get_sized_ascender() * 1.5)
self.descender = int(self.font.get_sized_descender() * 1.5)
self.line_height = self.ascender - self.descender
self.write_lines("'q', ESCAPE or close this window to quit\n"
"SPACE to play/pause\n"
"'r' to rewind\n"
"'f' to faid out over 5 seconds\n", 0)
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.close()
return False
def close(self):
pygame.display.quit()
Window.instance = None
def write_lines(self, text, line=0):
w, h = self.screen.get_size()
line_height = self.line_height
nlines = h // line_height
if line < 0:
line = nlines + line
for i, text_line in enumerate(text.split('\n'), line):
y = i * line_height + self.ascender
# Clear the line first.
self.screen.fill(Color('white'),
(0, i * line_height, w, line_height))
# Write new text.
self.font.render_to(self.screen, (15, y), text_line, Color('blue'))
pygame.display.flip()
def show_usage_message():
print("Usage: python playmus.py <file>")
print(" python -m pygame.examples.playmus <file>")
def main(file_path):
"""Play an audio file with pygame.mixer.music"""
with Window(file_path) as win:
win.write_lines('Loading ...', -1)
pygame.mixer.init(frequency=44100)
try:
paused = False
pygame.mixer.music.load(file_path)
# Make sure the event loop ticks over at least every 0.5 seconds.
pygame.time.set_timer(USEREVENT, 500)
pygame.mixer.music.play()
win.write_lines("Playing ...\n", -1)
while pygame.mixer.music.get_busy():
e = pygame.event.wait()
if e.type == pygame.KEYDOWN:
key = e.key
if key == K_SPACE:
if paused:
pygame.mixer.music.unpause()
paused = False
win.write_lines("Playing ...\n", -1)
else:
pygame.mixer.music.pause()
paused = True
win.write_lines("Paused ...\n", -1)
elif key == K_r:
pygame.mixer.music.rewind()
if paused:
win.write_lines("Rewound.", -1)
elif key == K_f:
win.write_lines("Faiding out ...\n", -1)
pygame.mixer.music.fadeout(5000)
# when finished get_busy() will return 0.
elif key in [K_q, K_ESCAPE]:
pygame.mixer.music.stop()
# get_busy() will now return 0.
elif e.type == QUIT:
pygame.mixer.music.stop()
# get_busy() will now return 0.
pygame.time.set_timer(USEREVENT, 0)
finally:
pygame.mixer.quit()
if __name__ == '__main__':
# Check the only command line argument, a file path
if len(sys.argv) != 2:
show_usage_message()
else:
main(sys.argv[1])
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