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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 copy
import logging
import os
import subprocess
import time
from threading import Thread
from .stream_queue import StreamQueue
class PTSResync:
def __init__(self, _config, _config_section, _id):
self.logger = logging.getLogger(__name__)
self.config = _config
self.config_section = _config_section
self.empty_packet_count = 0
self.is_restart_requested = False
self.is_looping = False
self.id = _id
self.ffmpeg_proc = None
if self.config[self.config_section]['player-enable_pts_resync']:
if self.config[self.config_section]['player-pts_resync_type'] == 'ffmpeg':
self.ffmpeg_proc = self.open_ffmpeg_proc()
self.stream_queue = StreamQueue(188, self.ffmpeg_proc, _id)
if self.config[self.config_section]['player-pts_resync_type'] == 'ffmpeg':
self.logger.debug('PTS Resync running ffmpeg')
def video_to_stdin(self, _video):
video_copy = copy.copy(_video.data)
i = 3
self.is_looping = False
while i > 0:
i -= 1
try:
if video_copy:
self.ffmpeg_proc.stdin.write(video_copy)
break
except (BrokenPipeError, TypeError) as ex:
# This occurs when the process does not start correctly
self.logger.debug('BROKENPIPE {} {}'.format(self.ffmpeg_proc.pid, str(ex)))
if not self.is_restart_requested:
errcode = self.restart_ffmpeg()
self.is_looping = True
else:
time.sleep(0.7)
except ValueError:
# during termination, writing to a closed port, ignore
break
self.is_looping = False
video_copy = None
def restart_ffmpeg(self):
self.logger.debug('Restarting PTSResync ffmpeg due to no ffmpeg processing {}'.format(self.ffmpeg_proc.pid))
errcode = 0
self.empty_packet_count = 0
self.stream_queue.terminate()
while True:
try:
self.ffmpeg_proc.terminate()
#self.ffmpeg_proc.wait(timeout=1.5)
break
except ValueError:
pass
except subprocess.TimeoutExpired:
time.sleep(0.01)
try:
sout, serr = self.ffmpeg_proc.communicate()
errcode = self.ffmpeg_proc.returncode
# an errcode of 1 means ffmpeg could not run
if errcode == 1:
self.logger.debug('FFMPEG ERRCODE: {}, unable for pts_resync to process segment in ffmpeg'.format(self.ffmpeg_proc.returncode))
except ValueError:
pass
while self.ffmpeg_proc.poll() is None:
time.sleep(0.1)
self.ffmpeg_proc = self.open_ffmpeg_proc()
self.stream_queue = StreamQueue(188, self.ffmpeg_proc, self.id)
time.sleep(0.5)
return errcode
def resequence_pts(self, _video):
if not self.config[self.config_section]['player-enable_pts_resync']:
return
if _video.data is None:
return
if self.config[self.config_section]['player-pts_resync_type'] == 'ffmpeg':
while self.is_looping:
time.sleep(0.5)
t_in = Thread(target=self.video_to_stdin, args=(_video,))
t_in.start()
time.sleep(0.1)
new_video = self.stream_queue.read()
if not new_video:
self.empty_packet_count += 1
if self.empty_packet_count > 2:
if not self.is_restart_requested:
self.is_restart_requested = True
self.restart_ffmpeg()
self.is_restart_requested = False
else:
self.empty_packet_count = 0
_video.data = new_video
elif self.config[self.config_section]['player-pts_resync_type'] == 'internal':
self.logger.warning('player-pts_resync_type internal NOT IMPLEMENTED')
else:
self.logger.error('player-pts_resync_type UNKNOWN TYPE {}'.format(
self.config[self.config_section]['player-pts_resync_type']))
def terminate(self):
if self.ffmpeg_proc is not None:
self.stream_queue.terminate()
self.ffmpeg_proc.stdin.flush()
self.ffmpeg_proc.stdout.flush()
self.ffmpeg_proc.terminate()
try:
sout, serr = self.ffmpeg_proc.communicate()
errcode = self.ffmpeg_proc.returncode
if errcode == 1:
self.logger.debug('FFMPEG errcode on exit: {}, unable for pts_resync to process segment in ffmpeg'.format(self.ffmpeg_proc.returncode))
except ValueError:
pass
def open_ffmpeg_proc(self):
"""
ffmpeg drops the first 9 frame/video packets when the program starts.
this means everytime a refresh occurs, 9 frames will be dropped. This is
visible by looking at the video packets for a 6 second window being 171
instead of 180. Following the first read, the packets increase to 180.
"""
ffmpeg_command = [
self.config['paths']['ffmpeg_path'],
'-nostats',
'-hide_banner',
'-loglevel', 'fatal',
'-i', 'pipe:0',
'-fflags', '+flush_packets+genpts',
'-avioflags', '+direct',
'-f', 'mpegts',
'-c', 'copy',
'pipe:1']
ffmpeg_process = subprocess.Popen(
ffmpeg_command,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
bufsize=-1)
return ffmpeg_process
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