250 lines
8.8 KiB
Python
250 lines
8.8 KiB
Python
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#!/usr/bin/env python
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""" pygame.examples.music_drop_fade
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Fade in and play music from a list while observing several events
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Adds music files to a playlist whenever played by one of the following methods
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Music files passed from the commandline are played
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Music files and filenames are played when drag and dropped onto the pygame window
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Polls the clipboard and plays music files if it finds one there
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Keyboard Controls:
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* Press space or enter to pause music playback
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* Press up or down to change the music volume
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* Press left or right to seek 5 seconds into the track
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* Press escape to quit
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* Press any other button to skip to the next music file in the list
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"""
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import pygame as pg
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import os, sys
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VOLUME_CHANGE_AMOUNT = 0.02 # how fast should up and down arrows change the volume?
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def add_file(filename):
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"""
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This function will check if filename exists and is a music file
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If it is the file will be added to a list of music files(even if already there)
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Type checking is by the extension of the file, not by its contents
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We can only discover if the file is valid when we mixer.music.load() it later
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It looks in the file directory and its data subdirectory
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"""
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if filename.rpartition(".")[2].lower() not in music_file_types:
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print(f"{filename} not added to file list")
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print("only these files types are allowed: ", music_file_types)
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return False
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elif os.path.exists(filename):
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music_file_list.append(filename)
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elif os.path.exists(os.path.join(main_dir, filename)):
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music_file_list.append(os.path.join(main_dir, filename))
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elif os.path.exists(os.path.join(data_dir, filename)):
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music_file_list.append(os.path.join(data_dir, filename))
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else:
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print("file not found")
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return False
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print(f"{filename} added to file list")
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return True
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def play_file(filename):
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"""
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This function will call add_file and play it if successful
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The music will fade in during the first 4 seconds
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set_endevent is used to post a MUSIC_DONE event when the song finishes
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The main loop will call play_next() when the MUSIC_DONE event is received
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"""
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global starting_pos
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if add_file(filename):
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try: # we must do this in case the file is not a valid audio file
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pg.mixer.music.load(music_file_list[-1])
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except pg.error as e:
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print(e) # print description such as 'Not an Ogg Vorbis audio stream'
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if filename in music_file_list:
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music_file_list.remove(filename)
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print(f"{filename} removed from file list")
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return
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pg.mixer.music.play(fade_ms=4000)
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pg.mixer.music.set_volume(volume)
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if filename.rpartition(".")[2].lower() in music_can_seek:
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print("file supports seeking")
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starting_pos = 0
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else:
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print("file does not support seeking")
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starting_pos = -1
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pg.mixer.music.set_endevent(MUSIC_DONE)
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def play_next():
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"""
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This function will play the next song in music_file_list
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It uses pop(0) to get the next song and then appends it to the end of the list
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The song will fade in during the first 4 seconds
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"""
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global starting_pos
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if len(music_file_list) > 1:
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nxt = music_file_list.pop(0)
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try:
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pg.mixer.music.load(nxt)
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except pg.error as e:
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print(e)
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print(f"{nxt} removed from file list")
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music_file_list.append(nxt)
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print("starting next song: ", nxt)
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else:
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nxt = music_file_list[0]
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pg.mixer.music.play(fade_ms=4000)
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pg.mixer.music.set_volume(volume)
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pg.mixer.music.set_endevent(MUSIC_DONE)
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if nxt.rpartition(".")[2].lower() in music_can_seek:
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starting_pos = 0
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else:
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starting_pos = -1
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def draw_text_line(text, y=0):
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"""
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Draws a line of text onto the display surface
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The text will be centered horizontally at the given y position
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The text's height is added to y and returned to the caller
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"""
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screen = pg.display.get_surface()
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surf = font.render(text, 1, (255, 255, 255))
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y += surf.get_height()
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x = (screen.get_width() - surf.get_width()) / 2
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screen.blit(surf, (x, y))
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return y
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def change_music_position(amount):
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"""
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Changes current playback position by amount seconds.
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This only works with OGG and MP3 files.
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music.get_pos() returns how many milliseconds the song has played, not
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the current position in the file. We must track the starting position
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ourselves. music.set_pos() will set the position in seconds.
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"""
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global starting_pos
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if starting_pos >= 0: # will be -1 unless play_file() was OGG or MP3
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played_for = pg.mixer.music.get_pos() / 1000.0
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old_pos = starting_pos + played_for
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starting_pos = old_pos + amount
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pg.mixer.music.play(start=starting_pos)
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print(f"jumped from {old_pos} to {starting_pos}")
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MUSIC_DONE = pg.event.custom_type() # event to be set as mixer.music.set_endevent()
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main_dir = os.path.split(os.path.abspath(__file__))[0]
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data_dir = os.path.join(main_dir, "data")
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starting_pos = 0 # needed to fast forward and rewind
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volume = 0.75
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music_file_list = []
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music_file_types = ("mp3", "ogg", "mid", "mod", "it", "xm", "wav")
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music_can_seek = ("mp3", "ogg", "mod", "it", "xm")
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def main():
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global font # this will be used by the draw_text_line function
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global volume, starting_pos
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running = True
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paused = False
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# we will be polling for key up and key down events
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# users should be able to change the volume by holding the up and down arrows
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# the change_volume variable will be set by key down events and cleared by key up events
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change_volume = 0
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pg.init()
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pg.display.set_mode((640, 480))
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font = pg.font.SysFont("Arial", 24)
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clock = pg.time.Clock()
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pg.scrap.init()
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pg.SCRAP_TEXT = pg.scrap.get_types()[0] # TODO remove when scrap module is fixed
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clipped = pg.scrap.get(pg.SCRAP_TEXT).decode("UTF-8")
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# store the current text from the clipboard TODO remove decode
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# add the command line arguments to the music_file_list
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for arg in sys.argv[1:]:
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add_file(arg)
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play_file("house_lo.ogg") # play default music included with pygame
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# draw instructions on screen
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y = draw_text_line("Drop music files or path names onto this window", 20)
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y = draw_text_line("Copy file names into the clipboard", y)
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y = draw_text_line("Or feed them from the command line", y)
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y = draw_text_line("If it's music it will play!", y)
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y = draw_text_line("SPACE to pause or UP/DOWN to change volume", y)
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y = draw_text_line("LEFT and RIGHT will skip around the track", y)
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draw_text_line("Other keys will start the next track", y)
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"""
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This is the main loop
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It will respond to drag and drop, clipboard changes, and key presses
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"""
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while running:
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for ev in pg.event.get():
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if ev.type == pg.QUIT:
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running = False
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elif ev.type == pg.DROPTEXT:
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play_file(ev.text)
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elif ev.type == pg.DROPFILE:
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play_file(ev.file)
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elif ev.type == MUSIC_DONE:
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play_next()
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elif ev.type == pg.KEYDOWN:
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if ev.key == pg.K_ESCAPE:
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running = False # exit loop
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elif ev.key in (pg.K_SPACE, pg.K_RETURN):
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if paused:
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pg.mixer.music.unpause()
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paused = False
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else:
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pg.mixer.music.pause()
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paused = True
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elif ev.key == pg.K_UP:
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change_volume = VOLUME_CHANGE_AMOUNT
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elif ev.key == pg.K_DOWN:
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change_volume = -VOLUME_CHANGE_AMOUNT
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elif ev.key == pg.K_RIGHT:
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change_music_position(+5)
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elif ev.key == pg.K_LEFT:
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change_music_position(-5)
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else:
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play_next()
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elif ev.type == pg.KEYUP:
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if ev.key in (pg.K_UP, pg.K_DOWN):
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change_volume = 0
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# is the user holding up or down?
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if change_volume:
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volume += change_volume
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volume = min(max(0, volume), 1) # volume should be between 0 and 1
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pg.mixer.music.set_volume(volume)
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print("volume:", volume)
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# TODO remove decode when SDL2 scrap is fixed
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new_text = pg.scrap.get(pg.SCRAP_TEXT).decode("UTF-8")
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if new_text != clipped: # has the clipboard changed?
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clipped = new_text
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play_file(clipped) # try to play the file if it has
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pg.display.flip()
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clock.tick(9) # keep CPU use down by updating screen less often
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pg.quit()
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if __name__ == "__main__":
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main()
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