example3.py

#!/usr/bin/env python

# This example shows how to use pygame to build a graphic frontend for
#  a karaoke application. 
# Requires: pygame.

import midifile, time, datetime, sys
import pygame

filename=raw_input('Please enter filename of .mid or .kar file:')

pygame.init()
screenx=1200
screeny=600
screen=pygame.display.set_mode([screenx,screeny])
font=pygame.font.Font(None,60)
color1=(100,100,250,0)
color2=(250,250,250,0)

m=midifile.midifile()
m.load_file(filename)

pygame.mixer.init()
pygame.mixer.music.load(filename)
pygame.mixer.music.play(0,0) # Start song at 0 and don't loop
start=datetime.datetime.now()

if not m.karfile:
    print "This is not a karaoke file. I'll just play it"
    while pygame.mixer.music.get_busy():
        time.sleep(1)
    sys.exit(0)


#start=start-datetime.timedelta(0,9) # To start lyrics at a later point
dt=0.
while pygame.mixer.music.get_busy():
    dt=(datetime.datetime.now()-start).total_seconds()
    m.update_karaoke(dt)

    for iline in range(3):
        l=font.size(m.karlinea[iline]+m.karlineb[iline])[0]
        x0a=screenx/2-l/2.
        linea=font.render(m.karlinea[iline],0,color1)
        lineb=font.render(m.karlineb[iline],0,color2)
        recta=screen.blit(linea,[x0a,80+iline*60])
        x0b=x0a+recta.width
        recbt=screen.blit(lineb,[x0b,80+iline*60])

    pygame.display.update()
    screen.fill(0)

    time.sleep(.1)