text: from __future__ import unicode_literals
  
  import os
  import re
  import subprocess
  import time
  
  from .common import FileDownloader
  from ..compat import compat_str
  from ..utils import (
      check_executable,
      encodeFilename,
      encodeArgument,
      get_exe_version,
  )
  
  
  def rtmpdump_version():
      return get_exe_version(
          'rtmpdump', ['--help'], r'(?i)RTMPDump\s*v?([0-9a-zA-Z._-]+)')
  
  
  class RtmpFD(FileDownloader):
      def real_download(self, filename, info_dict):
          def run_rtmpdump(args):
              start = time.time()
              resume_percent = None
              resume_downloaded_data_len = None
              proc = subprocess.Popen(args, stderr=subprocess.PIPE)
              cursor_in_new_line = True
              proc_stderr_closed = False
              try:
                  while not proc_stderr_closed:
                      # read line from stderr
                      line = ''
                      while True:
                          char = proc.stderr.read(1)
                          if not char:
                              proc_stderr_closed = True
                              break
                          if char in [b'\r', b'\n']:
                              break
                          line += char.decode('ascii', 'replace')
                      if not line:
                          # proc_stderr_closed is True
                          continue
                      mobj = re.search(r'([0-9]+\.[0-9]{3}) kB / [0-9]+\.[0-9]{2} sec \(([0-9]{1,2}\.[0-9])%\)', line)
                      if mobj:
                          downloaded_data_len = int(float(mobj.group(1)) * 1024)
                          percent = float(mobj.group(2))
                          if not resume_percent:
                              resume_percent = percent
                              resume_downloaded_data_len = downloaded_data_len
                          time_now = time.time()
                          eta = self.calc_eta(start, time_now, 100 - resume_percent, percent - resume_percent)
                          speed = self.calc_speed(start, time_now, downloaded_data_len - resume_downloaded_data_len)
                          data_len = None
                          if percent > 0:
                              data_len = int(downloaded_data_len * 100 / percent)
                          self._hook_progress({
                              'status': 'downloading',
                              'downloaded_bytes': downloaded_data_len,
                              'total_bytes_estimate': data_len,
                              'tmpfilename': tmpfilename,
                              'filename': filename,
                              'eta': eta,
                              'elapsed': time_now - start,
                              'speed': speed,
                          })
                          cursor_in_new_line = False
                      else:
                          # no percent for live streams
                          mobj = re.search(r'([0-9]+\.[0-9]{3}) kB / [0-9]+\.[0-9]{2} sec', line)
                          if mobj:
                              downloaded_data_len = int(float(mobj.group(1)) * 1024)
                              time_now = time.time()
                              speed = self.calc_speed(start, time_now, downloaded_data_len)
                              self._hook_progress({
                                  'downloaded_bytes': downloaded_data_len,
                                  'tmpfilename': tmpfilename,
                                  'filename': filename,
                                  'status': 'downloading',
                                  'elapsed': time_now - start,
                                  'speed': speed,
                              })
                              cursor_in_new_line = False
                          elif self.params.get('verbose', False):
                              if not cursor_in_new_line:
                                  self.to_screen('')
                              cursor_in_new_line = True
                              self.to_screen('[rtmpdump] ' + line)
                  if not cursor_in_new_line:
                      self.to_screen('')
                  return proc.wait()
              except BaseException:  # Including KeyboardInterrupt
                  proc.kill()
                  proc.wait()
                  raise
  
          url = info_dict['url']
          player_url = info_dict.get('player_url')
          page_url = info_dict.get('page_url')
          app = info_dict.get('app')
          play_path = info_dict.get('play_path')
          tc_url = info_dict.get('tc_url')
          flash_version = info_dict.get('flash_version')
          live = info_dict.get('rtmp_live', False)
          conn = info_dict.get('rtmp_conn')
          protocol = info_dict.get('rtmp_protocol')
          real_time = info_dict.get('rtmp_real_time', False)
          no_resume = info_dict.get('no_resume', False)
          continue_dl = self.params.get('continuedl', True)
  
          self.report_destination(filename)
          tmpfilename = self.temp_name(filename)
          test = self.params.get('test', False)
  
          # Check for rtmpdump first
          if not check_executable('rtmpdump', ['-h']):
              self.report_error('RTMP download detected but "rtmpdump" could not be run. Please install')
              return False
  
          # Download using rtmpdump. rtmpdump returns exit code 2 when
          # the connection was interrupted and resuming appears to be
          # possible. This is part of rtmpdump's normal usage, AFAIK.
          basic_args = [
              'rtmpdump', '--verbose', '-r', url,
              '-o', tmpfilename]
          if player_url is not None:
              basic_args += ['--swfVfy', player_url]
          if page_url is not None:
              basic_args += ['--pageUrl', page_url]
          if app is not None:
              basic_args += ['--app', app]
          if play_path is not None:
              basic_args += ['--playpath', play_path]
          if tc_url is not None:
              basic_args += ['--tcUrl', tc_url]
          if test:
              basic_args += ['--stop', '1']
          if flash_version is not None:
              basic_args += ['--flashVer', flash_version]
          if live:
              basic_args += ['--live']
          if isinstance(conn, list):
              for entry in conn:
                  basic_args += ['--conn', entry]
          elif isinstance(conn, compat_str):
              basic_args += ['--conn', conn]
          if protocol is not None:
              basic_args += ['--protocol', protocol]
          if real_time:
              basic_args += ['--realtime']
  
          args = basic_args
          if not no_resume and continue_dl and not live:
              args += ['--resume']
          if not live and continue_dl:
              args += ['--skip', '1']
  
          args = [encodeArgument(a) for a in args]
  
          self._debug_cmd(args, exe='rtmpdump')
  
          RD_SUCCESS = 0
          RD_FAILED = 1
          RD_INCOMPLETE = 2
          RD_NO_CONNECT = 3
  
          started = time.time()
  
          try:
              retval = run_rtmpdump(args)
          except KeyboardInterrupt:
              if not info_dict.get('is_live'):
                  raise
              retval = RD_SUCCESS
              self.to_screen('\n[rtmpdump] Interrupted by user')
  
          if retval == RD_NO_CONNECT:
              self.report_error('[rtmpdump] Could not connect to RTMP server.')
              return False
  
          while retval in (RD_INCOMPLETE, RD_FAILED) and not test and not live:
              prevsize = os.path.getsize(encodeFilename(tmpfilename))
              self.to_screen('[rtmpdump] Downloaded %s bytes' % prevsize)
              time.sleep(5.0)  # This seems to be needed
              args = basic_args + ['--resume']
              if retval == RD_FAILED:
                  args += ['--skip', '1']
              args = [encodeArgument(a) for a in args]
              retval = run_rtmpdump(args)
              cursize = os.path.getsize(encodeFilename(tmpfilename))
              if prevsize == cursize and retval == RD_FAILED:
                  break
              # Some rtmp streams seem abort after ~ 99.8%. Don't complain for those
              if prevsize == cursize and retval == RD_INCOMPLETE and cursize > 1024:
                  self.to_screen('[rtmpdump] Could not download the whole video. This can happen for some advertisements.')
                  retval = RD_SUCCESS
                  break
          if retval == RD_SUCCESS or (test and retval == RD_INCOMPLETE):
              fsize = os.path.getsize(encodeFilename(tmpfilename))
              self.to_screen('[rtmpdump] Downloaded %s bytes' % fsize)
              self.try_rename(tmpfilename, filename)
              self._hook_progress({
                  'downloaded_bytes': fsize,
                  'total_bytes': fsize,
                  'filename': filename,
                  'status': 'finished',
                  'elapsed': time.time() - started,
              })
              return True
          else:
              self.to_stderr('\n')
              self.report_error('rtmpdump exited with code %d' % retval)
              return False
  