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VLC Python EventManager回调类型?

libvlc vlc python

10

Ian Wetherbee · 技术社区 · 15 年前

在使用VLC Python绑定时,我很难附加事件处理程序来判断歌曲何时播放完毕。event\u attach函数正在抱怨回调类型。

def __init__(self):
    self.vlc = vlc.Instance()
    self.vlc_playlist = self.vlc.media_list_new()
    self.vlc_player = self.vlc.media_list_player_new()
    self.vlc_player.set_media_list(self.vlc_playlist)
    self.vlc_events = self.vlc_player.event_manager()
    self.vlc_events.event_attach(vlc.EventType.MediaPlayerEndReached, self.SongFinished, 1)
    ....
def SongFinished(self, *args, **kwargs):
    pass

错误:

self.vlc_events.event_attach(vlc.EventType.MediaPlayerEndReached, self.SongFinished, 1)
return libvlc_event_attach(self, i_event_type, f_callback, user_data)
    ArgumentError: argument 3: <type 'exceptions.TypeError'>: wrong type

2 回复 | 直到 15 年前

1

12

Rolf of Saxony 5 年前

下面是最新版本的基本代码 vlc.py 使用 event_manager :

import vlc
import time
import sys

finish = 0

def SongFinished(event):
    global finish
    print("\nEvent reports - finished")
    finish = 1

def pos_callback(event, player):
    sec = player.get_time() / 1000
    m, s = divmod(sec, 60)
    npos = event.u.new_position * 100
    sys.stdout.write('\r%s %02d:%02d (%.2f%%)' % ('Position', m, s, npos))
    sys.stdout.flush()

instance = vlc.Instance()
player = instance.media_player_new()
media = instance.media_new_path('vp1.mp3') #Your audio file here
player.set_media(media)
events = player.event_manager()
events.event_attach(vlc.EventType.MediaPlayerEndReached, SongFinished)
events.event_attach(vlc.EventType.MediaPlayerPositionChanged, pos_callback, player)

player.play()
while finish == 0:
    time.sleep(0.5)

注意:媒体播放器有很多事件可以通过这种方式进行监视。

MediaPlayerMediaChanged
MediaPlayerNothingSpecial
MediaPlayerOpening
MediaPlayerBuffering
MediaPlayerPlaying
MediaPlayerPaused
MediaPlayerStopped
MediaPlayerForward
MediaPlayerBackward
MediaPlayerEndReached
MediaPlayerEncounteredError
MediaPlayerTimeChanged
MediaPlayerPositionChanged
MediaPlayerSeekableChanged
MediaPlayerPausableChanged
MediaPlayerTitleChanged
MediaPlayerSnapshotTaken
MediaPlayerLengthChanged
MediaPlayerVout
MediaPlayerScrambledChanged
MediaPlayerESAdded
MediaPlayerESDeleted
MediaPlayerESSelected
MediaPlayerCorked
MediaPlayerUncorked
MediaPlayerMuted
MediaPlayerUnmuted
MediaPlayerAudioVolume
MediaPlayerAudioDevice

class EventType
https://github.com/oaubert/python-vlc/blob/master/generated/3.0/vlc.py

2

10

Ian Wetherbee 15 年前

找到了,VLC.py公司包括一个小的decorator ctypes函数,用于包装回调:

callbackmethod=ctypes.CFUNCTYPE(None, Event, ctypes.c_void_p)

使用方法:

@callbackmethod
def SongFinished(self, data):
    print data

.event_attach(vlc.EventType.MediaPlayerEndReached, SongFinished, 1)