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"""
MIT License
Copyright (C) 2021 ROCKY4546
https://github.com/rocky4546
This file is part of Cabernet
Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the “Software”), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
"""
import logging
import time
from threading import Thread
class StreamQueue:
"""
This works when we run a process that has an output of a continuous stream.
Used with ffmpeg and streamlink
"""
def __init__(self, _bytes_per_read, _proc, _stream_id):
self.logger = logging.getLogger(__name__)
self.bytes_per_read = _bytes_per_read
self.sout = _proc.stdout
self.serr = _proc.stderr
self.queue = []
self.proc = _proc
self.stream_id = _stream_id
self.is_terminated = False
def _populate_queue():
"""
Collect lines from 'stream' and put them in 'queue'.
"""
while not self.is_terminated:
try:
self.sout.flush()
video_data = self.sout.read(self.bytes_per_read)
if video_data:
self.queue.append(video_data)
else:
self.logger.debug('Stream ended for this process, exiting queue thread')
self.is_terminated = True
break
except ValueError:
# occurs on termination with buffer must not be NULL
self.is_terminated = True
break
self._t = Thread(target=_populate_queue, args=())
self._t.daemon = True
self._t.start() # start collecting blocks from the stream
def read(self):
is_queue_changing = True
queue_size = len(self.queue)
while is_queue_changing:
time.sleep(0.1)
if len(self.queue) != queue_size:
queue_size = len(self.queue)
else:
is_queue_changing = False
if len(self.queue) > 0:
clone_queue = self.queue.copy()
del self.queue[:len(clone_queue)]
return b''.join(clone_queue)
return None
def terminate(self):
self.is_terminated = True
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