Split FileDownloader in two classes: FileDownloader and YoutubeDL

YoutubeDL is the class that coordinates everything
FileDownloader gets a filename and an info dict and downloads the video.

3 files changed, 622 insertions, 540 deletions

diff --git a/youtube_dl/FileDownloader.py b/youtube_dl/FileDownloader.py
index f21c66c29..445f3e85e 100644
--- a/youtube_dl/FileDownloader.py
+++ b/youtube_dl/FileDownloader.py
@@ -1,9 +1,6 @@
 import math
-import io
 import os
 import re
-import shutil
-import socket
 import subprocess
 import sys
 import time
@@ -13,103 +10,45 @@ if os.name == 'nt':
     import ctypes
 
 from .utils import *
-from .extractor import get_info_extractor
 
 
 class FileDownloader(object):
     """File Downloader class.
 
     File downloader objects are the ones responsible of downloading the
-    actual video file and writing it to disk if the user has requested
-    it, among some other tasks. In most cases there should be one per
-    program. As, given a video URL, the downloader doesn't know how to
-    extract all the needed information, task that InfoExtractors do, it
-    has to pass the URL to one of them.
-
-    For this, file downloader objects have a method that allows
-    InfoExtractors to be registered in a given order. When it is passed
-    a URL, the file downloader handles it to the first InfoExtractor it
-    finds that reports being able to handle it. The InfoExtractor extracts
-    all the information about the video or videos the URL refers to, and
-    asks the FileDownloader to process the video information, possibly
-    downloading the video.
+    actual video file and writing it to disk.
 
     File downloaders accept a lot of parameters. In order not to saturate
     the object constructor with arguments, it receives a dictionary of
-    options instead. These options are available through the params
-    attribute for the InfoExtractors to use. The FileDownloader also
-    registers itself as the downloader in charge for the InfoExtractors
-    that are added to it, so this is a "mutual registration".
+    options instead.
 
     Available options:
 
-    username:          Username for authentication purposes.
-    password:          Password for authentication purposes.
-    usenetrc:          Use netrc for authentication instead.
+    verbose:           Print additional info to stdout.
     quiet:             Do not print messages to stdout.
-    forceurl:          Force printing final URL.
-    forcetitle:        Force printing title.
-    forceid:           Force printing ID.
-    forcethumbnail:    Force printing thumbnail URL.
-    forcedescription:  Force printing description.
-    forcefilename:     Force printing final filename.
-    simulate:          Do not download the video files.
-    format:            Video format code.
-    format_limit:      Highest quality format to try.
-    outtmpl:           Template for output names.
-    restrictfilenames: Do not allow "&" and spaces in file names
-    ignoreerrors:      Do not stop on download errors.
     ratelimit:         Download speed limit, in bytes/sec.
-    nooverwrites:      Prevent overwriting files.
     retries:           Number of times to retry for HTTP error 5xx
     buffersize:        Size of download buffer in bytes.
     noresizebuffer:    Do not automatically resize the download buffer.
     continuedl:        Try to continue downloads if possible.
     noprogress:        Do not print the progress bar.
-    playliststart:     Playlist item to start at.
-    playlistend:       Playlist item to end at.
-    matchtitle:        Download only matching titles.
-    rejecttitle:       Reject downloads for matching titles.
     logtostderr:       Log messages to stderr instead of stdout.
     consoletitle:      Display progress in console window's titlebar.
     nopart:            Do not use temporary .part files.
     updatetime:        Use the Last-modified header to set output file timestamps.
-    writedescription:  Write the video description to a .description file
-    writeinfojson:     Write the video description to a .info.json file
-    writethumbnail:    Write the thumbnail image to a file
-    writesubtitles:    Write the video subtitles to a file
-    allsubtitles:      Downloads all the subtitles of the video
-    listsubtitles:     Lists all available subtitles for the video
-    subtitlesformat:   Subtitle format [sbv/srt] (default=srt)
-    subtitleslang:     Language of the subtitles to download
     test:              Download only first bytes to test the downloader.
-    keepvideo:         Keep the video file after post-processing
     min_filesize:      Skip files smaller than this size
     max_filesize:      Skip files larger than this size
-    daterange:         A DateRange object, download only if the upload_date is in the range.
-    skip_download:     Skip the actual download of the video file
     """
 
     params = None
-    _ies = []
-    _pps = []
-    _download_retcode = None
-    _num_downloads = None
-    _screen_file = None
 
-    def __init__(self, params):
+    def __init__(self, ydl, params):
         """Create a FileDownloader object with the given options."""
-        self._ies = []
-        self._pps = []
+        self.ydl = ydl
         self._progress_hooks = []
-        self._download_retcode = 0
-        self._num_downloads = 0
-        self._screen_file = [sys.stdout, sys.stderr][params.get('logtostderr', False)]
         self.params = params
 
-        if '%(stitle)s' in self.params['outtmpl']:
-            self.report_warning(u'%(stitle)s is deprecated. Use the %(title)s and the --restrict-filenames flag(which also secures %(uploader)s et al) instead.')
-
     @staticmethod
     def format_bytes(bytes):
         if bytes is None:
@@ -174,34 +113,11 @@ class FileDownloader(object):
         multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
         return int(round(number * multiplier))
 
-    def add_info_extractor(self, ie):
-        """Add an InfoExtractor object to the end of the list."""
-        self._ies.append(ie)
-        ie.set_downloader(self)
-
-    def add_post_processor(self, pp):
-        """Add a PostProcessor object to the end of the chain."""
-        self._pps.append(pp)
-        pp.set_downloader(self)
-
-    def to_screen(self, message, skip_eol=False):
-        """Print message to stdout if not in quiet mode."""
-        assert type(message) == type(u'')
-        if not self.params.get('quiet', False):
-            terminator = [u'\n', u''][skip_eol]
-            output = message + terminator
-            if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
-                output = output.encode(preferredencoding(), 'ignore')
-            self._screen_file.write(output)
-            self._screen_file.flush()
+    def to_screen(self, *args, **kargs):
+        self.ydl.to_screen(*args, **kargs)
 
     def to_stderr(self, message):
-        """Print message to stderr."""
-        assert type(message) == type(u'')
-        output = message + u'\n'
-        if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
-            output = output.encode(preferredencoding())
-        sys.stderr.write(output)
+        self.ydl.to_screen(message)
 
     def to_cons_title(self, message):
         """Set console/terminal window title to message."""
@@ -214,63 +130,14 @@ class FileDownloader(object):
         elif 'TERM' in os.environ:
             self.to_screen('\033]0;%s\007' % message, skip_eol=True)
 
-    def fixed_template(self):
-        """Checks if the output template is fixed."""
-        return (re.search(u'(?u)%\\(.+?\\)s', self.params['outtmpl']) is None)
-
-    def trouble(self, message=None, tb=None):
-        """Determine action to take when a download problem appears.
+    def trouble(self, *args, **kargs):
+        self.ydl.trouble(*args, **kargs)
 
-        Depending on if the downloader has been configured to ignore
-        download errors or not, this method may throw an exception or
-        not when errors are found, after printing the message.
+    def report_warning(self, *args, **kargs):
+        self.ydl.report_warning(*args, **kargs)
 
-        tb, if given, is additional traceback information.
-        """
-        if message is not None:
-            self.to_stderr(message)
-        if self.params.get('verbose'):
-            if tb is None:
-                if sys.exc_info()[0]:  # if .trouble has been called from an except block
-                    tb = u''
-                    if hasattr(sys.exc_info()[1], 'exc_info') and sys.exc_info()[1].exc_info[0]:
-                        tb += u''.join(traceback.format_exception(*sys.exc_info()[1].exc_info))
-                    tb += compat_str(traceback.format_exc())
-                else:
-                    tb_data = traceback.format_list(traceback.extract_stack())
-                    tb = u''.join(tb_data)
-            self.to_stderr(tb)
-        if not self.params.get('ignoreerrors', False):
-            if sys.exc_info()[0] and hasattr(sys.exc_info()[1], 'exc_info') and sys.exc_info()[1].exc_info[0]:
-                exc_info = sys.exc_info()[1].exc_info
-            else:
-                exc_info = sys.exc_info()
-            raise DownloadError(message, exc_info)
-        self._download_retcode = 1
-
-    def report_warning(self, message):
-        '''
-        Print the message to stderr, it will be prefixed with 'WARNING:'
-        If stderr is a tty file the 'WARNING:' will be colored
-        '''
-        if sys.stderr.isatty() and os.name != 'nt':
-            _msg_header=u'\033[0;33mWARNING:\033[0m'
-        else:
-            _msg_header=u'WARNING:'
-        warning_message=u'%s %s' % (_msg_header,message)
-        self.to_stderr(warning_message)
-
-    def report_error(self, message, tb=None):
-        '''
-        Do the same as trouble, but prefixes the message with 'ERROR:', colored
-        in red if stderr is a tty file.
-        '''
-        if sys.stderr.isatty() and os.name != 'nt':
-            _msg_header = u'\033[0;31mERROR:\033[0m'
-        else:
-            _msg_header = u'ERROR:'
-        error_message = u'%s %s' % (_msg_header, message)
-        self.trouble(error_message, tb)
+    def report_error(self, *args, **kargs):
+        self.ydl.error(*args, **kargs)
 
     def slow_down(self, start_time, byte_counter):
         """Sleep if the download speed is over the rate limit."""
@@ -326,18 +193,6 @@ class FileDownloader(object):
             pass
         return filetime
 
-    def report_writedescription(self, descfn):
-        """ Report that the description file is being written """
-        self.to_screen(u'[info] Writing video description to: ' + descfn)
-
-    def report_writesubtitles(self, sub_filename):
-        """ Report that the subtitles file is being written """
-        self.to_screen(u'[info] Writing video subtitles to: ' + sub_filename)
-
-    def report_writeinfojson(self, infofn):
-        """ Report that the metadata file has been written """
-        self.to_screen(u'[info] Video description metadata as JSON to: ' + infofn)
-
     def report_destination(self, filename):
         """Report destination filename."""
         self.to_screen(u'[download] Destination: ' + filename)
@@ -382,375 +237,6 @@ class FileDownloader(object):
         else:
             self.to_screen(u'')
 
-    def increment_downloads(self):
-        """Increment the ordinal that assigns a number to each file."""
-        self._num_downloads += 1
-
-    def prepare_filename(self, info_dict):
-        """Generate the output filename."""
-        try:
-            template_dict = dict(info_dict)
-
-            template_dict['epoch'] = int(time.time())
-            autonumber_size = self.params.get('autonumber_size')
-            if autonumber_size is None:
-                autonumber_size = 5
-            autonumber_templ = u'%0' + str(autonumber_size) + u'd'
-            template_dict['autonumber'] = autonumber_templ % self._num_downloads
-            if template_dict['playlist_index'] is not None:
-                template_dict['playlist_index'] = u'%05d' % template_dict['playlist_index']
-
-            sanitize = lambda k,v: sanitize_filename(
-                u'NA' if v is None else compat_str(v),
-                restricted=self.params.get('restrictfilenames'),
-                is_id=(k==u'id'))
-            template_dict = dict((k, sanitize(k, v)) for k,v in template_dict.items())
-
-            filename = self.params['outtmpl'] % template_dict
-            return filename
-        except KeyError as err:
-            self.report_error(u'Erroneous output template')
-            return None
-        except ValueError as err:
-            self.report_error(u'Insufficient system charset ' + repr(preferredencoding()))
-            return None
-
-    def _match_entry(self, info_dict):
-        """ Returns None iff the file should be downloaded """
-
-        title = info_dict['title']
-        matchtitle = self.params.get('matchtitle', False)
-        if matchtitle:
-            if not re.search(matchtitle, title, re.IGNORECASE):
-                return u'[download] "' + title + '" title did not match pattern "' + matchtitle + '"'
-        rejecttitle = self.params.get('rejecttitle', False)
-        if rejecttitle:
-            if re.search(rejecttitle, title, re.IGNORECASE):
-                return u'"' + title + '" title matched reject pattern "' + rejecttitle + '"'
-        date = info_dict.get('upload_date', None)
-        if date is not None:
-            dateRange = self.params.get('daterange', DateRange())
-            if date not in dateRange:
-                return u'[download] %s upload date is not in range %s' % (date_from_str(date).isoformat(), dateRange)
-        return None
-        
-    def extract_info(self, url, download=True, ie_key=None, extra_info={}):
-        '''
-        Returns a list with a dictionary for each video we find.
-        If 'download', also downloads the videos.
-        extra_info is a dict containing the extra values to add to each result
-         '''
-        
-        if ie_key:
-            ie = get_info_extractor(ie_key)()
-            ie.set_downloader(self)
-            ies = [ie]
-        else:
-            ies = self._ies
-
-        for ie in ies:
-            if not ie.suitable(url):
-                continue
-
-            if not ie.working():
-                self.report_warning(u'The program functionality for this site has been marked as broken, '
-                                    u'and will probably not work.')
-
-            try:
-                ie_result = ie.extract(url)
-                if ie_result is None: # Finished already (backwards compatibility; listformats and friends should be moved here)
-                    break
-                if isinstance(ie_result, list):
-                    # Backwards compatibility: old IE result format
-                    for result in ie_result:
-                        result.update(extra_info)
-                    ie_result = {
-                        '_type': 'compat_list',
-                        'entries': ie_result,
-                    }
-                else:
-                    ie_result.update(extra_info)
-                if 'extractor' not in ie_result:
-                    ie_result['extractor'] = ie.IE_NAME
-                return self.process_ie_result(ie_result, download=download)
-            except ExtractorError as de: # An error we somewhat expected
-                self.report_error(compat_str(de), de.format_traceback())
-                break
-            except Exception as e:
-                if self.params.get('ignoreerrors', False):
-                    self.report_error(compat_str(e), tb=compat_str(traceback.format_exc()))
-                    break
-                else:
-                    raise
-        else:
-            self.report_error(u'no suitable InfoExtractor: %s' % url)
-        
-    def process_ie_result(self, ie_result, download=True, extra_info={}):
-        """
-        Take the result of the ie(may be modified) and resolve all unresolved
-        references (URLs, playlist items).
-
-        It will also download the videos if 'download'.
-        Returns the resolved ie_result.
-        """
-
-        result_type = ie_result.get('_type', 'video') # If not given we suppose it's a video, support the default old system
-        if result_type == 'video':
-            if 'playlist' not in ie_result:
-                # It isn't part of a playlist
-                ie_result['playlist'] = None
-                ie_result['playlist_index'] = None
-            if download:
-                self.process_info(ie_result)
-            return ie_result
-        elif result_type == 'url':
-            # We have to add extra_info to the results because it may be
-            # contained in a playlist
-            return self.extract_info(ie_result['url'],
-                                     download,
-                                     ie_key=ie_result.get('ie_key'),
-                                     extra_info=extra_info)
-        elif result_type == 'playlist':
-            # We process each entry in the playlist
-            playlist = ie_result.get('title', None) or ie_result.get('id', None)
-            self.to_screen(u'[download] Downloading playlist: %s'  % playlist)
-
-            playlist_results = []
-
-            n_all_entries = len(ie_result['entries'])
-            playliststart = self.params.get('playliststart', 1) - 1
-            playlistend = self.params.get('playlistend', -1)
-
-            if playlistend == -1:
-                entries = ie_result['entries'][playliststart:]
-            else:
-                entries = ie_result['entries'][playliststart:playlistend]
-
-            n_entries = len(entries)
-
-            self.to_screen(u"[%s] playlist '%s': Collected %d video ids (downloading %d of them)" %
-                (ie_result['extractor'], playlist, n_all_entries, n_entries))
-
-            for i,entry in enumerate(entries,1):
-                self.to_screen(u'[download] Downloading video #%s of %s' %(i, n_entries))
-                extra = {
-                         'playlist': playlist, 
-                         'playlist_index': i + playliststart,
-                         }
-                if not 'extractor' in entry:
-                    # We set the extractor, if it's an url it will be set then to
-                    # the new extractor, but if it's already a video we must make
-                    # sure it's present: see issue #877
-                    entry['extractor'] = ie_result['extractor']
-                entry_result = self.process_ie_result(entry,
-                                                      download=download,
-                                                      extra_info=extra)
-                playlist_results.append(entry_result)
-            ie_result['entries'] = playlist_results
-            return ie_result
-        elif result_type == 'compat_list':
-            def _fixup(r):
-                r.setdefault('extractor', ie_result['extractor'])
-                return r
-            ie_result['entries'] = [
-                self.process_ie_result(_fixup(r), download=download)
-                for r in ie_result['entries']
-            ]
-            return ie_result
-        else:
-            raise Exception('Invalid result type: %s' % result_type)
-
-    def process_info(self, info_dict):
-        """Process a single resolved IE result."""
-
-        assert info_dict.get('_type', 'video') == 'video'
-        #We increment the download the download count here to match the previous behaviour.
-        self.increment_downloads()
-
-        info_dict['fulltitle'] = info_dict['title']
-        if len(info_dict['title']) > 200:
-            info_dict['title'] = info_dict['title'][:197] + u'...'
-
-        # Keep for backwards compatibility
-        info_dict['stitle'] = info_dict['title']
-
-        if not 'format' in info_dict:
-            info_dict['format'] = info_dict['ext']
-
-        reason = self._match_entry(info_dict)
-        if reason is not None:
-            self.to_screen(u'[download] ' + reason)
-            return
-
-        max_downloads = self.params.get('max_downloads')
-        if max_downloads is not None:
-            if self._num_downloads > int(max_downloads):
-                raise MaxDownloadsReached()
-
-        filename = self.prepare_filename(info_dict)
-
-        # Forced printings
-        if self.params.get('forcetitle', False):
-            compat_print(info_dict['title'])
-        if self.params.get('forceid', False):
-            compat_print(info_dict['id'])
-        if self.params.get('forceurl', False):
-            compat_print(info_dict['url'])
-        if self.params.get('forcethumbnail', False) and 'thumbnail' in info_dict:
-            compat_print(info_dict['thumbnail'])
-        if self.params.get('forcedescription', False) and 'description' in info_dict:
-            compat_print(info_dict['description'])
-        if self.params.get('forcefilename', False) and filename is not None:
-            compat_print(filename)
-        if self.params.get('forceformat', False):
-            compat_print(info_dict['format'])
-
-        # Do nothing else if in simulate mode
-        if self.params.get('simulate', False):
-            return
-
-        if filename is None:
-            return
-
-        try:
-            dn = os.path.dirname(encodeFilename(filename))
-            if dn != '' and not os.path.exists(dn):
-                os.makedirs(dn)
-        except (OSError, IOError) as err:
-            self.report_error(u'unable to create directory ' + compat_str(err))
-            return
-
-        if self.params.get('writedescription', False):
-            try:
-                descfn = filename + u'.description'
-                self.report_writedescription(descfn)
-                with io.open(encodeFilename(descfn), 'w', encoding='utf-8') as descfile:
-                    descfile.write(info_dict['description'])
-            except (OSError, IOError):
-                self.report_error(u'Cannot write description file ' + descfn)
-                return
-
-        if self.params.get('writesubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
-            # subtitles download errors are already managed as troubles in relevant IE
-            # that way it will silently go on when used with unsupporting IE
-            subtitle = info_dict['subtitles'][0]
-            (sub_error, sub_lang, sub) = subtitle
-            sub_format = self.params.get('subtitlesformat')
-            if sub_error:
-                self.report_warning("Some error while getting the subtitles")
-            else:
-                try:
-                    sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
-                    self.report_writesubtitles(sub_filename)
-                    with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
-                        subfile.write(sub)
-                except (OSError, IOError):
-                    self.report_error(u'Cannot write subtitles file ' + descfn)
-                    return
-
-        if self.params.get('allsubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
-            subtitles = info_dict['subtitles']
-            sub_format = self.params.get('subtitlesformat')
-            for subtitle in subtitles:
-                (sub_error, sub_lang, sub) = subtitle
-                if sub_error:
-                    self.report_warning("Some error while getting the subtitles")
-                else:
-                    try:
-                        sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
-                        self.report_writesubtitles(sub_filename)
-                        with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
-                                subfile.write(sub)
-                    except (OSError, IOError):
-                        self.report_error(u'Cannot write subtitles file ' + descfn)
-                        return
-
-        if self.params.get('writeinfojson', False):
-            infofn = filename + u'.info.json'
-            self.report_writeinfojson(infofn)
-            try:
-                json_info_dict = dict((k, v) for k,v in info_dict.items() if not k in ['urlhandle'])
-                write_json_file(json_info_dict, encodeFilename(infofn))
-            except (OSError, IOError):
-                self.report_error(u'Cannot write metadata to JSON file ' + infofn)
-                return
-
-        if self.params.get('writethumbnail', False):
-            if 'thumbnail' in info_dict:
-                thumb_format = info_dict['thumbnail'].rpartition(u'/')[2].rpartition(u'.')[2]
-                if not thumb_format:
-                    thumb_format = 'jpg'
-                thumb_filename = filename.rpartition('.')[0] + u'.' + thumb_format
-                self.to_screen(u'[%s] %s: Downloading thumbnail ...' %
-                               (info_dict['extractor'], info_dict['id']))
-                uf = compat_urllib_request.urlopen(info_dict['thumbnail'])
-                with open(thumb_filename, 'wb') as thumbf:
-                    shutil.copyfileobj(uf, thumbf)
-                self.to_screen(u'[%s] %s: Writing thumbnail to: %s' %
-                               (info_dict['extractor'], info_dict['id'], thumb_filename))
-
-        if not self.params.get('skip_download', False):
-            if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(filename)):
-                success = True
-            else:
-                try:
-                    success = self._do_download(filename, info_dict)
-                except (OSError, IOError) as err:
-                    raise UnavailableVideoError()
-                except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
-                    self.report_error(u'unable to download video data: %s' % str(err))
-                    return
-                except (ContentTooShortError, ) as err:
-                    self.report_error(u'content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded))
-                    return
-
-            if success:
-                try:
-                    self.post_process(filename, info_dict)
-                except (PostProcessingError) as err:
-                    self.report_error(u'postprocessing: %s' % str(err))
-                    return
-
-    def download(self, url_list):
-        """Download a given list of URLs."""
-        if len(url_list) > 1 and self.fixed_template():
-            raise SameFileError(self.params['outtmpl'])
-
-        for url in url_list:
-            try:
-                #It also downloads the videos
-                videos = self.extract_info(url)
-            except UnavailableVideoError:
-                self.report_error(u'unable to download video')
-            except MaxDownloadsReached:
-                self.to_screen(u'[info] Maximum number of downloaded files reached.')
-                raise
-
-        return self._download_retcode
-
-    def post_process(self, filename, ie_info):
-        """Run all the postprocessors on the given file."""
-        info = dict(ie_info)
-        info['filepath'] = filename
-        keep_video = None
-        for pp in self._pps:
-            try:
-                keep_video_wish,new_info = pp.run(info)
-                if keep_video_wish is not None:
-                    if keep_video_wish:
-                        keep_video = keep_video_wish
-                    elif keep_video is None:
-                        # No clear decision yet, let IE decide
-                        keep_video = keep_video_wish
-            except PostProcessingError as e:
-                self.to_stderr(u'ERROR: ' + e.msg)
-        if keep_video is False and not self.params.get('keepvideo', False):
-            try:
-                self.to_screen(u'Deleting original file %s (pass -k to keep)' % filename)
-                os.remove(encodeFilename(filename))
-            except (IOError, OSError):
-                self.report_warning(u'Unable to remove downloaded video file')
-
     def _download_with_rtmpdump(self, filename, url, player_url, page_url, play_path, tc_url):
         self.report_destination(filename)
         tmpfilename = self.temp_name(filename)
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
new file mode 100644
index 000000000..52ee8cedb
--- /dev/null
+++ b/youtube_dl/YoutubeDL.py
@@ -0,0 +1,595 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from __future__ import absolute_import
+
+import io
+import os
+import re
+import shutil
+import socket
+import sys
+import time
+import traceback
+
+from .utils import *
+from .extractor import get_info_extractor
+from .FileDownloader import FileDownloader
+
+
+class YoutubeDL(object):
+    """YoutubeDL class.
+
+    YoutubeDL objects are the ones responsible of downloading the
+    actual video file and writing it to disk if the user has requested
+    it, among some other tasks. In most cases there should be one per
+    program. As, given a video URL, the downloader doesn't know how to
+    extract all the needed information, task that InfoExtractors do, it
+    has to pass the URL to one of them.
+
+    For this, YoutubeDL objects have a method that allows
+    InfoExtractors to be registered in a given order. When it is passed
+    a URL, the YoutubeDL object handles it to the first InfoExtractor it
+    finds that reports being able to handle it. The InfoExtractor extracts
+    all the information about the video or videos the URL refers to, and
+    YoutubeDL process the extracted information, possibly using a File
+    Downloader to download the video.
+
+    YoutubeDL objects accept a lot of parameters. In order not to saturate
+    the object constructor with arguments, it receives a dictionary of
+    options instead. These options are available through the params
+    attribute for the InfoExtractors to use. The YoutubeDL also
+    registers itself as the downloader in charge for the InfoExtractors
+    that are added to it, so this is a "mutual registration".
+
+    Available options:
+
+    username:          Username for authentication purposes.
+    password:          Password for authentication purposes.
+    usenetrc:          Use netrc for authentication instead.
+    verbose:           Print additional info to stdout.
+    quiet:             Do not print messages to stdout.
+    forceurl:          Force printing final URL.
+    forcetitle:        Force printing title.
+    forceid:           Force printing ID.
+    forcethumbnail:    Force printing thumbnail URL.
+    forcedescription:  Force printing description.
+    forcefilename:     Force printing final filename.
+    simulate:          Do not download the video files.
+    format:            Video format code.
+    format_limit:      Highest quality format to try.
+    outtmpl:           Template for output names.
+    restrictfilenames: Do not allow "&" and spaces in file names
+    ignoreerrors:      Do not stop on download errors.
+    nooverwrites:      Prevent overwriting files.
+    playliststart:     Playlist item to start at.
+    playlistend:       Playlist item to end at.
+    matchtitle:        Download only matching titles.
+    rejecttitle:       Reject downloads for matching titles.
+    logtostderr:       Log messages to stderr instead of stdout.
+    writedescription:  Write the video description to a .description file
+    writeinfojson:     Write the video description to a .info.json file
+    writethumbnail:    Write the thumbnail image to a file
+    writesubtitles:    Write the video subtitles to a file
+    allsubtitles:      Downloads all the subtitles of the video
+    listsubtitles:     Lists all available subtitles for the video
+    subtitlesformat:   Subtitle format [sbv/srt] (default=srt)
+    subtitleslang:     Language of the subtitles to download
+    keepvideo:         Keep the video file after post-processing
+    daterange:         A DateRange object, download only if the upload_date is in the range.
+    skip_download:     Skip the actual download of the video file
+    
+    The following parameters are not used by YoutubeDL itself, they are used by
+    the FileDownloader:
+    nopart, updatetime, buffersize, ratelimit, min_filesize, max_filesize, test,
+    noresizebuffer, retries, continuedl, noprogress, consoletitle
+    """
+
+    params = None
+    _ies = []
+    _pps = []
+    _download_retcode = None
+    _num_downloads = None
+    _screen_file = None
+
+    def __init__(self, params):
+        """Create a FileDownloader object with the given options."""
+        self._ies = []
+        self._pps = []
+        self._progress_hooks = []
+        self._download_retcode = 0
+        self._num_downloads = 0
+        self._screen_file = [sys.stdout, sys.stderr][params.get('logtostderr', False)]
+        self.params = params
+        self.fd = FileDownloader(self, self.params)
+
+        if '%(stitle)s' in self.params['outtmpl']:
+            self.report_warning(u'%(stitle)s is deprecated. Use the %(title)s and the --restrict-filenames flag(which also secures %(uploader)s et al) instead.')
+
+    def add_info_extractor(self, ie):
+        """Add an InfoExtractor object to the end of the list."""
+        self._ies.append(ie)
+        ie.set_downloader(self)
+
+    def add_post_processor(self, pp):
+        """Add a PostProcessor object to the end of the chain."""
+        self._pps.append(pp)
+        pp.set_downloader(self)
+
+    def to_screen(self, message, skip_eol=False):
+        """Print message to stdout if not in quiet mode."""
+        assert type(message) == type(u'')
+        if not self.params.get('quiet', False):
+            terminator = [u'\n', u''][skip_eol]
+            output = message + terminator
+            if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
+                output = output.encode(preferredencoding(), 'ignore')
+            self._screen_file.write(output)
+            self._screen_file.flush()
+
+    def to_stderr(self, message):
+        """Print message to stderr."""
+        assert type(message) == type(u'')
+        output = message + u'\n'
+        if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
+            output = output.encode(preferredencoding())
+        sys.stderr.write(output)
+
+    def fixed_template(self):
+        """Checks if the output template is fixed."""
+        return (re.search(u'(?u)%\\(.+?\\)s', self.params['outtmpl']) is None)
+
+    def trouble(self, message=None, tb=None):
+        """Determine action to take when a download problem appears.
+
+        Depending on if the downloader has been configured to ignore
+        download errors or not, this method may throw an exception or
+        not when errors are found, after printing the message.
+
+        tb, if given, is additional traceback information.
+        """
+        if message is not None:
+            self.to_stderr(message)
+        if self.params.get('verbose'):
+            if tb is None:
+                if sys.exc_info()[0]:  # if .trouble has been called from an except block
+                    tb = u''
+                    if hasattr(sys.exc_info()[1], 'exc_info') and sys.exc_info()[1].exc_info[0]:
+                        tb += u''.join(traceback.format_exception(*sys.exc_info()[1].exc_info))
+                    tb += compat_str(traceback.format_exc())
+                else:
+                    tb_data = traceback.format_list(traceback.extract_stack())
+                    tb = u''.join(tb_data)
+            self.to_stderr(tb)
+        if not self.params.get('ignoreerrors', False):
+            if sys.exc_info()[0] and hasattr(sys.exc_info()[1], 'exc_info') and sys.exc_info()[1].exc_info[0]:
+                exc_info = sys.exc_info()[1].exc_info
+            else:
+                exc_info = sys.exc_info()
+            raise DownloadError(message, exc_info)
+        self._download_retcode = 1
+
+    def report_warning(self, message):
+        '''
+        Print the message to stderr, it will be prefixed with 'WARNING:'
+        If stderr is a tty file the 'WARNING:' will be colored
+        '''
+        if sys.stderr.isatty() and os.name != 'nt':
+            _msg_header=u'\033[0;33mWARNING:\033[0m'
+        else:
+            _msg_header=u'WARNING:'
+        warning_message=u'%s %s' % (_msg_header,message)
+        self.to_stderr(warning_message)
+
+    def report_error(self, message, tb=None):
+        '''
+        Do the same as trouble, but prefixes the message with 'ERROR:', colored
+        in red if stderr is a tty file.
+        '''
+        if sys.stderr.isatty() and os.name != 'nt':
+            _msg_header = u'\033[0;31mERROR:\033[0m'
+        else:
+            _msg_header = u'ERROR:'
+        error_message = u'%s %s' % (_msg_header, message)
+        self.trouble(error_message, tb)
+
+    def slow_down(self, start_time, byte_counter):
+        """Sleep if the download speed is over the rate limit."""
+        rate_limit = self.params.get('ratelimit', None)
+        if rate_limit is None or byte_counter == 0:
+            return
+        now = time.time()
+        elapsed = now - start_time
+        if elapsed <= 0.0:
+            return
+        speed = float(byte_counter) / elapsed
+        if speed > rate_limit:
+            time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
+
+    def report_writedescription(self, descfn):
+        """ Report that the description file is being written """
+        self.to_screen(u'[info] Writing video description to: ' + descfn)
+
+    def report_writesubtitles(self, sub_filename):
+        """ Report that the subtitles file is being written """
+        self.to_screen(u'[info] Writing video subtitles to: ' + sub_filename)
+
+    def report_writeinfojson(self, infofn):
+        """ Report that the metadata file has been written """
+        self.to_screen(u'[info] Video description metadata as JSON to: ' + infofn)
+
+    def report_file_already_downloaded(self, file_name):
+        """Report file has already been fully downloaded."""
+        try:
+            self.to_screen(u'[download] %s has already been downloaded' % file_name)
+        except (UnicodeEncodeError) as err:
+            self.to_screen(u'[download] The file has already been downloaded')
+
+    def increment_downloads(self):
+        """Increment the ordinal that assigns a number to each file."""
+        self._num_downloads += 1
+
+    def prepare_filename(self, info_dict):
+        """Generate the output filename."""
+        try:
+            template_dict = dict(info_dict)
+
+            template_dict['epoch'] = int(time.time())
+            autonumber_size = self.params.get('autonumber_size')
+            if autonumber_size is None:
+                autonumber_size = 5
+            autonumber_templ = u'%0' + str(autonumber_size) + u'd'
+            template_dict['autonumber'] = autonumber_templ % self._num_downloads
+            if template_dict['playlist_index'] is not None:
+                template_dict['playlist_index'] = u'%05d' % template_dict['playlist_index']
+
+            sanitize = lambda k,v: sanitize_filename(
+                u'NA' if v is None else compat_str(v),
+                restricted=self.params.get('restrictfilenames'),
+                is_id=(k==u'id'))
+            template_dict = dict((k, sanitize(k, v)) for k,v in template_dict.items())
+
+            filename = self.params['outtmpl'] % template_dict
+            return filename
+        except KeyError as err:
+            self.report_error(u'Erroneous output template')
+            return None
+        except ValueError as err:
+            self.report_error(u'Insufficient system charset ' + repr(preferredencoding()))
+            return None
+
+    def _match_entry(self, info_dict):
+        """ Returns None iff the file should be downloaded """
+
+        title = info_dict['title']
+        matchtitle = self.params.get('matchtitle', False)
+        if matchtitle:
+            if not re.search(matchtitle, title, re.IGNORECASE):
+                return u'[download] "' + title + '" title did not match pattern "' + matchtitle + '"'
+        rejecttitle = self.params.get('rejecttitle', False)
+        if rejecttitle:
+            if re.search(rejecttitle, title, re.IGNORECASE):
+                return u'"' + title + '" title matched reject pattern "' + rejecttitle + '"'
+        date = info_dict.get('upload_date', None)
+        if date is not None:
+            dateRange = self.params.get('daterange', DateRange())
+            if date not in dateRange:
+                return u'[download] %s upload date is not in range %s' % (date_from_str(date).isoformat(), dateRange)
+        return None
+        
+    def extract_info(self, url, download=True, ie_key=None, extra_info={}):
+        '''
+        Returns a list with a dictionary for each video we find.
+        If 'download', also downloads the videos.
+        extra_info is a dict containing the extra values to add to each result
+         '''
+        
+        if ie_key:
+            ie = get_info_extractor(ie_key)()
+            ie.set_downloader(self)
+            ies = [ie]
+        else:
+            ies = self._ies
+
+        for ie in ies:
+            if not ie.suitable(url):
+                continue
+
+            if not ie.working():
+                self.report_warning(u'The program functionality for this site has been marked as broken, '
+                                    u'and will probably not work.')
+
+            try:
+                ie_result = ie.extract(url)
+                if ie_result is None: # Finished already (backwards compatibility; listformats and friends should be moved here)
+                    break
+                if isinstance(ie_result, list):
+                    # Backwards compatibility: old IE result format
+                    for result in ie_result:
+                        result.update(extra_info)
+                    ie_result = {
+                        '_type': 'compat_list',
+                        'entries': ie_result,
+                    }
+                else:
+                    ie_result.update(extra_info)
+                if 'extractor' not in ie_result:
+                    ie_result['extractor'] = ie.IE_NAME
+                return self.process_ie_result(ie_result, download=download)
+            except ExtractorError as de: # An error we somewhat expected
+                self.report_error(compat_str(de), de.format_traceback())
+                break
+            except Exception as e:
+                if self.params.get('ignoreerrors', False):
+                    self.report_error(compat_str(e), tb=compat_str(traceback.format_exc()))
+                    break
+                else:
+                    raise
+        else:
+            self.report_error(u'no suitable InfoExtractor: %s' % url)
+        
+    def process_ie_result(self, ie_result, download=True, extra_info={}):
+        """
+        Take the result of the ie(may be modified) and resolve all unresolved
+        references (URLs, playlist items).
+
+        It will also download the videos if 'download'.
+        Returns the resolved ie_result.
+        """
+
+        result_type = ie_result.get('_type', 'video') # If not given we suppose it's a video, support the default old system
+        if result_type == 'video':
+            if 'playlist' not in ie_result:
+                # It isn't part of a playlist
+                ie_result['playlist'] = None
+                ie_result['playlist_index'] = None
+            if download:
+                self.process_info(ie_result)
+            return ie_result
+        elif result_type == 'url':
+            # We have to add extra_info to the results because it may be
+            # contained in a playlist
+            return self.extract_info(ie_result['url'],
+                                     download,
+                                     ie_key=ie_result.get('ie_key'),
+                                     extra_info=extra_info)
+        elif result_type == 'playlist':
+            # We process each entry in the playlist
+            playlist = ie_result.get('title', None) or ie_result.get('id', None)
+            self.to_screen(u'[download] Downloading playlist: %s'  % playlist)
+
+            playlist_results = []
+
+            n_all_entries = len(ie_result['entries'])
+            playliststart = self.params.get('playliststart', 1) - 1
+            playlistend = self.params.get('playlistend', -1)
+
+            if playlistend == -1:
+                entries = ie_result['entries'][playliststart:]
+            else:
+                entries = ie_result['entries'][playliststart:playlistend]
+
+            n_entries = len(entries)
+
+            self.to_screen(u"[%s] playlist '%s': Collected %d video ids (downloading %d of them)" %
+                (ie_result['extractor'], playlist, n_all_entries, n_entries))
+
+            for i,entry in enumerate(entries,1):
+                self.to_screen(u'[download] Downloading video #%s of %s' %(i, n_entries))
+                extra = {
+                         'playlist': playlist, 
+                         'playlist_index': i + playliststart,
+                         }
+                if not 'extractor' in entry:
+                    # We set the extractor, if it's an url it will be set then to
+                    # the new extractor, but if it's already a video we must make
+                    # sure it's present: see issue #877
+                    entry['extractor'] = ie_result['extractor']
+                entry_result = self.process_ie_result(entry,
+                                                      download=download,
+                                                      extra_info=extra)
+                playlist_results.append(entry_result)
+            ie_result['entries'] = playlist_results
+            return ie_result
+        elif result_type == 'compat_list':
+            def _fixup(r):
+                r.setdefault('extractor', ie_result['extractor'])
+                return r
+            ie_result['entries'] = [
+                self.process_ie_result(_fixup(r), download=download)
+                for r in ie_result['entries']
+            ]
+            return ie_result
+        else:
+            raise Exception('Invalid result type: %s' % result_type)
+
+    def process_info(self, info_dict):
+        """Process a single resolved IE result."""
+
+        assert info_dict.get('_type', 'video') == 'video'
+        #We increment the download the download count here to match the previous behaviour.
+        self.increment_downloads()
+
+        info_dict['fulltitle'] = info_dict['title']
+        if len(info_dict['title']) > 200:
+            info_dict['title'] = info_dict['title'][:197] + u'...'
+
+        # Keep for backwards compatibility
+        info_dict['stitle'] = info_dict['title']
+
+        if not 'format' in info_dict:
+            info_dict['format'] = info_dict['ext']
+
+        reason = self._match_entry(info_dict)
+        if reason is not None:
+            self.to_screen(u'[download] ' + reason)
+            return
+
+        max_downloads = self.params.get('max_downloads')
+        if max_downloads is not None:
+            if self._num_downloads > int(max_downloads):
+                raise MaxDownloadsReached()
+
+        filename = self.prepare_filename(info_dict)
+
+        # Forced printings
+        if self.params.get('forcetitle', False):
+            compat_print(info_dict['title'])
+        if self.params.get('forceid', False):
+            compat_print(info_dict['id'])
+        if self.params.get('forceurl', False):
+            compat_print(info_dict['url'])
+        if self.params.get('forcethumbnail', False) and 'thumbnail' in info_dict:
+            compat_print(info_dict['thumbnail'])
+        if self.params.get('forcedescription', False) and 'description' in info_dict:
+            compat_print(info_dict['description'])
+        if self.params.get('forcefilename', False) and filename is not None:
+            compat_print(filename)
+        if self.params.get('forceformat', False):
+            compat_print(info_dict['format'])
+
+        # Do nothing else if in simulate mode
+        if self.params.get('simulate', False):
+            return
+
+        if filename is None:
+            return
+
+        try:
+            dn = os.path.dirname(encodeFilename(filename))
+            if dn != '' and not os.path.exists(dn):
+                os.makedirs(dn)
+        except (OSError, IOError) as err:
+            self.report_error(u'unable to create directory ' + compat_str(err))
+            return
+
+        if self.params.get('writedescription', False):
+            try:
+                descfn = filename + u'.description'
+                self.report_writedescription(descfn)
+                with io.open(encodeFilename(descfn), 'w', encoding='utf-8') as descfile:
+                    descfile.write(info_dict['description'])
+            except (OSError, IOError):
+                self.report_error(u'Cannot write description file ' + descfn)
+                return
+
+        if self.params.get('writesubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
+            # subtitles download errors are already managed as troubles in relevant IE
+            # that way it will silently go on when used with unsupporting IE
+            subtitle = info_dict['subtitles'][0]
+            (sub_error, sub_lang, sub) = subtitle
+            sub_format = self.params.get('subtitlesformat')
+            if sub_error:
+                self.report_warning("Some error while getting the subtitles")
+            else:
+                try:
+                    sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
+                    self.report_writesubtitles(sub_filename)
+                    with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
+                        subfile.write(sub)
+                except (OSError, IOError):
+                    self.report_error(u'Cannot write subtitles file ' + descfn)
+                    return
+
+        if self.params.get('allsubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
+            subtitles = info_dict['subtitles']
+            sub_format = self.params.get('subtitlesformat')
+            for subtitle in subtitles:
+                (sub_error, sub_lang, sub) = subtitle
+                if sub_error:
+                    self.report_warning("Some error while getting the subtitles")
+                else:
+                    try:
+                        sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
+                        self.report_writesubtitles(sub_filename)
+                        with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
+                                subfile.write(sub)
+                    except (OSError, IOError):
+                        self.report_error(u'Cannot write subtitles file ' + descfn)
+                        return
+
+        if self.params.get('writeinfojson', False):
+            infofn = filename + u'.info.json'
+            self.report_writeinfojson(infofn)
+            try:
+                json_info_dict = dict((k, v) for k,v in info_dict.items() if not k in ['urlhandle'])
+                write_json_file(json_info_dict, encodeFilename(infofn))
+            except (OSError, IOError):
+                self.report_error(u'Cannot write metadata to JSON file ' + infofn)
+                return
+
+        if self.params.get('writethumbnail', False):
+            if 'thumbnail' in info_dict:
+                thumb_format = info_dict['thumbnail'].rpartition(u'/')[2].rpartition(u'.')[2]
+                if not thumb_format:
+                    thumb_format = 'jpg'
+                thumb_filename = filename.rpartition('.')[0] + u'.' + thumb_format
+                self.to_screen(u'[%s] %s: Downloading thumbnail ...' %
+                               (info_dict['extractor'], info_dict['id']))
+                uf = compat_urllib_request.urlopen(info_dict['thumbnail'])
+                with open(thumb_filename, 'wb') as thumbf:
+                    shutil.copyfileobj(uf, thumbf)
+                self.to_screen(u'[%s] %s: Writing thumbnail to: %s' %
+                               (info_dict['extractor'], info_dict['id'], thumb_filename))
+
+        if not self.params.get('skip_download', False):
+            if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(filename)):
+                success = True
+            else:
+                try:
+                    success = self.fd._do_download(filename, info_dict)
+                except (OSError, IOError) as err:
+                    raise UnavailableVideoError()
+                except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
+                    self.report_error(u'unable to download video data: %s' % str(err))
+                    return
+                except (ContentTooShortError, ) as err:
+                    self.report_error(u'content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded))
+                    return
+
+            if success:
+                try:
+                    self.post_process(filename, info_dict)
+                except (PostProcessingError) as err:
+                    self.report_error(u'postprocessing: %s' % str(err))
+                    return
+
+    def download(self, url_list):
+        """Download a given list of URLs."""
+        if len(url_list) > 1 and self.fixed_template():
+            raise SameFileError(self.params['outtmpl'])
+
+        for url in url_list:
+            try:
+                #It also downloads the videos
+                videos = self.extract_info(url)
+            except UnavailableVideoError:
+                self.report_error(u'unable to download video')
+            except MaxDownloadsReached:
+                self.to_screen(u'[info] Maximum number of downloaded files reached.')
+                raise
+
+        return self._download_retcode
+
+    def post_process(self, filename, ie_info):
+        """Run all the postprocessors on the given file."""
+        info = dict(ie_info)
+        info['filepath'] = filename
+        keep_video = None
+        for pp in self._pps:
+            try:
+                keep_video_wish,new_info = pp.run(info)
+                if keep_video_wish is not None:
+                    if keep_video_wish:
+                        keep_video = keep_video_wish
+                    elif keep_video is None:
+                        # No clear decision yet, let IE decide
+                        keep_video = keep_video_wish
+            except PostProcessingError as e:
+                self.to_stderr(u'ERROR: ' + e.msg)
+        if keep_video is False and not self.params.get('keepvideo', False):
+            try:
+                self.to_screen(u'Deleting original file %s (pass -k to keep)' % filename)
+                os.remove(encodeFilename(filename))
+            except (IOError, OSError):
+                self.report_warning(u'Unable to remove downloaded video file')
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index a8b62a6cd..180217b94 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -46,6 +46,7 @@ from .update import update_self
 from .version import __version__
 from .FileDownloader import *
 from .extractor import gen_extractors
+from .YoutubeDL import YoutubeDL
 from .PostProcessor import *
 
 def parseOpts(overrideArguments=None):
@@ -492,8 +493,8 @@ def _real_main(argv=None):
             or (opts.autonumber and u'%(autonumber)s-%(id)s.%(ext)s')
             or u'%(title)s-%(id)s.%(ext)s')
 
-    # File downloader
-    fd = FileDownloader({
+    # YoutubeDL
+    ydl = YoutubeDL({
         'usenetrc': opts.usenetrc,
         'username': opts.username,
         'password': opts.password,
@@ -550,31 +551,31 @@ def _real_main(argv=None):
         })
 
     if opts.verbose:
-        fd.to_screen(u'[debug] youtube-dl version ' + __version__)
+        ydl.to_screen(u'[debug] youtube-dl version ' + __version__)
         try:
             sp = subprocess.Popen(['git', 'rev-parse', '--short', 'HEAD'], stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                                   cwd=os.path.dirname(os.path.abspath(__file__)))
             out, err = sp.communicate()
             out = out.decode().strip()
             if re.match('[0-9a-f]+', out):
-                fd.to_screen(u'[debug] Git HEAD: ' + out)
+                ydl.to_screen(u'[debug] Git HEAD: ' + out)
         except:
             pass
-        fd.to_screen(u'[debug] Python version %s - %s' %(platform.python_version(), platform.platform()))
-        fd.to_screen(u'[debug] Proxy map: ' + str(proxy_handler.proxies))
+        ydl.to_screen(u'[debug] Python version %s - %s' %(platform.python_version(), platform.platform()))
+        ydl.to_screen(u'[debug] Proxy map: ' + str(proxy_handler.proxies))
 
     for extractor in extractors:
-        fd.add_info_extractor(extractor)
+        ydl.add_info_extractor(extractor)
 
     # PostProcessors
     if opts.extractaudio:
-        fd.add_post_processor(FFmpegExtractAudioPP(preferredcodec=opts.audioformat, preferredquality=opts.audioquality, nopostoverwrites=opts.nopostoverwrites))
+        ydl.add_post_processor(FFmpegExtractAudioPP(preferredcodec=opts.audioformat, preferredquality=opts.audioquality, nopostoverwrites=opts.nopostoverwrites))
     if opts.recodevideo:
-        fd.add_post_processor(FFmpegVideoConvertor(preferedformat=opts.recodevideo))
+        ydl.add_post_processor(FFmpegVideoConvertor(preferedformat=opts.recodevideo))
 
     # Update version
     if opts.update_self:
-        update_self(fd.to_screen, opts.verbose, sys.argv[0])
+        update_self(ydl.to_screen, opts.verbose, sys.argv[0])
 
     # Maybe do nothing
     if len(all_urls) < 1:
@@ -584,9 +585,9 @@ def _real_main(argv=None):
             sys.exit()
 
     try:
-        retcode = fd.download(all_urls)
+        retcode = ydl.download(all_urls)
     except MaxDownloadsReached:
-        fd.to_screen(u'--max-download limit reached, aborting.')
+        ydl.to_screen(u'--max-download limit reached, aborting.')
         retcode = 101
 
     # Dump cookie jar if requested