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