no-cups
Last change
on this file since eee389a was
eee389a,
checked in by Jessica B. Hamrick <jhamrick@…>, 12 years ago
|
Better threading model
|
-
Property mode set to
100644
|
File size:
2.2 KB
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Rev | Line | |
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[eee389a] | 1 | import logging |
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| 2 | import threading |
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| 3 | import subprocess |
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| 4 | import time |
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| 5 | |
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| 6 | # initialize logger |
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| 7 | logger = logging.getLogger(__name__) |
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| 8 | |
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| 9 | class Player(threading.Thread): |
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| 10 | |
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| 11 | def __init__(self, fh, *args, **kwargs): |
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| 12 | self.lock = threading.RLock() |
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| 13 | |
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| 14 | with self.lock: |
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| 15 | super(Player, self).__init__(*args, **kwargs) |
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| 16 | self.fh = fh |
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| 17 | self.player = None |
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| 18 | self._callback = None |
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| 19 | |
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| 20 | @property |
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| 21 | def is_playing(self): |
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| 22 | with self.lock: |
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| 23 | playing = self.player and self.player.poll() is None |
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| 24 | return playing |
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| 25 | |
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| 26 | @property |
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| 27 | def callback(self): |
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| 28 | return self._callback |
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| 29 | @callback.setter |
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| 30 | def callback(self, val): |
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| 31 | with self.lock: |
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| 32 | self._callback = val |
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| 33 | |
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| 34 | def run(self): |
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| 35 | if self.fh is None: |
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| 36 | raise ValueError, "file handler is None" |
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| 37 | |
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| 38 | self.mplayer_play() |
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| 39 | with self.lock: |
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| 40 | if self.callback: |
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| 41 | self.callback() |
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| 42 | |
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| 43 | def mplayer_play(self): |
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| 44 | logger.info("playing file '%s'" % self.fh.name) |
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| 45 | |
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| 46 | # open mplayer |
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| 47 | with self.lock: |
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| 48 | self.player = subprocess.Popen( |
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| 49 | "/usr/bin/mplayer -really-quiet -slave %s" % self.fh.name, |
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| 50 | shell=True, |
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| 51 | stdin=subprocess.PIPE, |
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| 52 | stderr=subprocess.PIPE, |
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| 53 | stdout=subprocess.PIPE) |
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| 54 | |
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| 55 | # wait for mplayer to finish |
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| 56 | while True: |
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| 57 | with self.lock: |
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| 58 | playing = self.is_playing |
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| 59 | if not playing: |
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| 60 | break |
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| 61 | time.sleep(0.1) |
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| 62 | |
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| 63 | logger.info("mplayer finished with code %d" % self.player.returncode) |
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| 64 | |
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| 65 | # get output from mplayer and log it |
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| 66 | with self.lock: |
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| 67 | stderr = self.player.stderr.read() |
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| 68 | stdout = self.player.stdout.read() |
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| 69 | |
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| 70 | if stderr.strip() != "": |
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| 71 | logger.error(stderr) |
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| 72 | if stdout.strip() != "": |
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| 73 | logger.debug(stdout) |
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| 74 | |
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| 75 | def mplayer_pause(self): |
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| 76 | with self.lock: |
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| 77 | if self.is_playing: |
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| 78 | self.player.stdin.write("pause\n") |
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| 79 | |
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| 80 | def mplayer_stop(self): |
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| 81 | with self.lock: |
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| 82 | if self.is_playing: |
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| 83 | self.player.stdin.write("quit\n") |
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