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70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
# Copyright 2015 Adafruit Industries.
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# Author: Tony DiCola
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# License: GNU GPLv2, see LICENSE.txt
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import os
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import subprocess
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import time
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class HelloVideoPlayer(object):
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def __init__(self, config):
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"""Create an instance of a video player that runs hello_video.bin in the
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background.
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"""
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self._process = None
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self._load_config(config)
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def _load_config(self, config):
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self._extensions = config.get('hello_video', 'extensions') \
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.translate(None, ' \t\r\n.') \
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.split(',')
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def supported_extensions(self):
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"""Return list of supported file extensions."""
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return self._extensions
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def play(self, movie, loop=False):
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"""Play the provided movied file, optionally looping it repeatedly."""
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self.stop(3) # Up to 3 second delay to let the old player stop.
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# Assemble list of arguments.
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args = ['hello_video.bin']
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if loop:
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args.append('--loop') # Add loop parameter if necessary.
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args.append(movie) # Add movie file path.
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# Run hello_video process and direct standard output to /dev/null.
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self._process = subprocess.Popen(args,
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stdout=open(os.devnull, 'wb'),
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close_fds=True)
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def is_playing(self):
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"""Return true if the video player is running, false otherwise."""
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if self._process is None:
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return False
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self._process.poll()
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return self._process.returncode is None
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def stop(self, block_timeout_sec=None):
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"""Stop the video player. block_timeout_sec is how many seconds to
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block waiting for the player to stop before moving on.
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"""
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# Stop the player if it's running.
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if self._process is not None and self._process.returncode is None:
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# process.kill() doesn't seem to work reliably if USB drive is
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# removed, instead just run a kill -9 on it.
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subprocess.call(['kill', '-9', str(self._process.pid)])
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# If a blocking timeout was specified, wait up to that amount of time
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# for the process to stop.
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start = time.time()
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while self._process is not None and self._process.returncode is None:
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if (time.time() - start) >= block_timeout_sec:
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break
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time.sleep(0)
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# Let the process be garbage collected.
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self._process = None
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def create_player(config):
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"""Create new video player based on hello_video."""
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return HelloVideoPlayer(config)
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