Raspberry Pi MP3 Player

Raspberry Pi와 PiFaceCAD를 사용하여 MP3 플레이어를 만들어보았다. 이것도 역시 스터디 숙제. 음악 파일의 재생을 위해 pygame.mixer와 pygame.mixer.music을 사용했다.

소스 코드:

#!/usr/bin/python3

from pygame import mixer
import time

class Player:
    def __init__(self):
        self.isOn = True
        self.isPlaying = False
        self.isPaused = False

        show("MP3 Player")
        mixer.init()
        self.musicVolume = round(mixer.music.get_volume(), 1)
        import glob
        self.musicFiles = tuple(sorted(glob.glob("*.mp3")))
        self.musicNum = 0
        filename = self.musicFiles[self.musicNum]
        show(filename + "\nReady")

    def listen(self, sw_id, func, always=False):
        if cad.switches[sw_id].value == 1 and (always or self.isOn):
            while cad.switches[sw_id].value == 1: pass
            print('self.%s()' % func)
            exec('self.%s()' % func)

    def playPause(self):
        if self.isPlaying:
            self.pause()
        else:
            if self.isPaused:
                self.resume()
            else:
                self.play()

    def play(self):
        filename = self.musicFiles[self.musicNum]
        mixer.music.load(filename)
        self.musicTitle = filename
        show(self.musicTitle + "\nPlaying")
        mixer.music.play()
        self.isPlaying = True

    def pause(self):
        self.isPlaying = False
        mixer.music.pause()
        show(self.musicTitle + "\nPaused")
        self.isPaused = True

    def resume(self):
        self.isPlaying = True
        show(self.musicTitle + "\nPlaying")
        mixer.music.unpause()
        self.isPaused = False

    def prev(self):
        self.musicNum = (self.musicNum - 1) % len(self.musicFiles)
        self.play()

    def next(self):
        self.musicNum = (self.musicNum + 1) % len(self.musicFiles)
        self.play()

    def randomPlay(self):
        import random
        self.musicNum = random.choice(range(len(self.musicFiles)))
        self.play()

    def volumeUp(self):
        self.setVolume("up")

    def volumeDown(self):
        self.setVolume("down")

    def setVolume(self, action):
        min, max, delta = 0.0, 1.0, 0.1
        vol = mixer.music.get_volume()
        vol = round(vol, 1)

        if action is "up" and vol < max:
            vol = round(vol + delta, 1)
            mixer.music.set_volume(vol)
            show(self.musicTitle + "\nvol: " + str(vol))
            self.musicVolume = vol
        elif action is "down" and vol > min:
            vol = round(vol - delta, 1)
            mixer.music.set_volume(vol)
            show(self.musicTitle + "\nvol: " + str(vol))
            self.musicVolume = vol
        elif action is "mute":
            if vol == min:
                vol = self.musicVolume
                mixer.music.set_volume(vol)
                show(self.musicTitle + "\nvol: " + str(vol))
            else:
                vol = min
                mixer.music.set_volume(vol)
                show(self.musicTitle + "\nMuted")
        else:
            pass

    def mute(self):
        self.setVolume("mute")

    def onOff(self):
        if self.isOn:
            if self.isPlaying:
                mixer.music.stop()
            show('Bye...')
            time.sleep(2)
            cad.lcd.backlight_off()
            time.sleep(1)
            cad.lcd.clear()
            self.isOn = False
        else:
            self.__init__()

import pifacecad

cad = pifacecad.PiFaceCAD()
cad.lcd.backlight_on()
cad.lcd.cursor_off()
cad.lcd.blink_off()

def show(text):
    cad.lcd.clear()
    cad.lcd.write(text)

p = Player()

while True:
    p.listen(0, 'playPause')
    p.listen(1, 'prev')
    p.listen(2, 'next')
    p.listen(3, 'randomPlay')
    p.listen(4, 'onOff', True)
    p.listen(5, 'mute')
    p.listen(6, 'volumeDown')
    p.listen(7, 'volumeUp')