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Python + GST()+控制台解析

播放器自我维持操作:

1. 播放

2. 下一首

3. 上一首歌

4. 暂停

5. 查看播放列表信息

6. 查看当前的播放信息

7. 停止(退出)

通过分析由meliae转储的内存信息，它最多占用2.5M内存播放器 命令行播放器 命令行，这相对较小.

对应的代码: (需要在ubuntu下安装py-gst: sudo apt-get install python-gst0.10)

import gst

import gobject

import sys

#to avoid eclipse'warning

eval('gobject.threads_init()')

from threading import Thread

class AudioPlayer:

EVENT_PLAY_NEW = 1

def __init__(self, advisor):

self.main = gobject.MainLoop()

self.player = gst.element_factory_make('playbin', 'player')

self.index = -1

self.list = None

self.advisor = advisor

bus = self.player.get_bus()

bus.add_signal_watch()

bus.connect('message', self.on_message)

Thread(target=self.main.run).start()

def add_list(self , list=[]):

if list is None:

list = []

self.list = [(i, l.strip(), l[l.rfind('/') + 1:]) for (i, l) in enumerate(list)]

def play(self, index=None):

#play specified tracks

if 0 <= index < len(self.list):

self.index = index

self.player.set_state(gst.STATE_NULL)

self.player.set_property('uri', self.list[index][1])

self.player.set_state(gst.STATE_PLAYING)

if self.advisor:

self.advisor.on_message(AudioPlayer.EVENT_PLAY_NEW, (self.index, self.get_title()))

#resume playing

if index is None:

if self.index > -1:

self.player.set_state(gst.STATE_PLAYING)

def pause(self):

self.player.set_state(gst.STATE_PAUSED)

def stop(self):

self.player.set_state(gst.STATE_NULL)

self.main.quit()

def get_title(self):

if self.index == -1 or len(self.list) == 0:

return None

return self.list[self.index][2]

def get_previous(self):

if self.index == -1 or len(self.list) == 0:

return - 1

if self.index == 0:

return 0

return self.index - 1

def get_next(self):

if len(self.list) == 0:

return - 1

if self.index + 1 == len(self.list):

return 0

return self.index + 1

def on_message(self, bus, message):

t = message.type

if t == gst.MESSAGE_ERROR:

self.play(self.get_next())

elif t == gst.MESSAGE_EOS:

self.play(self.get_next())

class Console:

def __init__(self, list):

self.player = AudioPlayer(self)

self.player.add_list(list)

self.player.play(0)

Thread(target=self.run).start()

def run(self):

while(True):

self.on_cmd(raw_input())

def on_cmd(self, cmd):

if cmd is None:

return

if cmd.startswith('play'):

self.player.play()

elif cmd.startswith('next'):

self.player.play(self.player.get_next())

elif cmd.startswith('previous'):

self.player.play(self.player.get_previous())

elif cmd.startswith('pause'):

self.player.pause()

elif cmd.startswith('list'):

print '====================================='

for info in self.player.list:

print '%s. %s' % (info[0], info[2])

print '====================================='

elif cmd.startswith('info'):

print '====================================='

print '%s. %s' % (self.player.index, self.player.get_title())

print '====================================='

elif cmd.startswith('stop'):

self.player.stop()

sys.exit(0)

elif cmd.startswith('dump'):

from meliae import scanner

scanner.dump_all_objects('./dump.txt')

else:

print '''=====================================

Usage:

play

next

previous

pause

list

info

stop

dump

====================================='''

def on_message(self, event, info):

if event == AudioPlayer.EVENT_PLAY_NEW:

print '====================================='

print 'Tracks: %s.%s' % (info[0], info[1])

print '====================================='

if len(sys.argv) != 2:

print 'player.py mp3.list'

sys.exit(-1)

list = [l.strip() for l in open(sys.argv[1]).readlines() if l.strip() != '']

Console(list)

原始链接:

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http://www.pc-fly.com/a/bofangqi/article-152097-1.html