mediagoblin/media_types/video/processing.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 import tempfile
  18 import logging
  19 import os
  20
  21 from mediagoblin import mg_globals as mgg
  22 from mediagoblin.processing import create_pub_filepath
  23 from . import transcoders
  24
  25 logging.basicConfig()
  26
  27 _log = logging.getLogger(__name__)
  28 _log.setLevel(logging.DEBUG)
  29
  30
  31 def sniff_handler(media_file, **kw):
  32     transcoder = transcoders.VideoTranscoder()
  33     data = transcoder.discover(media_file.name)
  34
  35     _log.debug('Discovered: {0}'.format(data))
  36
  37     if not data:
  38         _log.error('Could not discover {0}'.format(
  39                 kw.get('media')))
  40         return False
  41
  42     if data['is_video'] == True:
  43         return True
  44
  45     return False
  46
  47
  48 def process_video(entry):
  49     """
  50     Process a video entry, transcode the queued media files (originals) and
  51     create a thumbnail for the entry.
  52     """
  53     video_config = mgg.global_config['media_type:mediagoblin.media_types.video']
  54
  55     workbench = mgg.workbench_manager.create_workbench()
  56
  57     queued_filepath = entry.queued_media_file
  58     queued_filename = workbench.localized_file(
  59         mgg.queue_store, queued_filepath,
  60         'source')
  61
  62     medium_filepath = create_pub_filepath(
  63         entry,
  64         '{original}-640p.webm'.format(
  65             original=os.path.splitext(
  66                 queued_filepath[-1])[0]  # Select the file name without .ext
  67             ))
  68
  69     thumbnail_filepath = create_pub_filepath(
  70         entry, 'thumbnail.jpg')
  71
  72     # Create a temporary file for the video destination
  73     tmp_dst = tempfile.NamedTemporaryFile()
  74
  75     with tmp_dst:
  76         # Transcode queued file to a VP8/vorbis file that fits in a 640x640 square
  77         transcoder = transcoders.VideoTranscoder()
  78         transcoder.transcode(queued_filename, tmp_dst.name)
  79
  80         # Push transcoded video to public storage
  81         _log.debug('Saving medium...')
  82         mgg.public_store.get_file(medium_filepath, 'wb').write(
  83             tmp_dst.read())
  84         _log.debug('Saved medium')
  85
  86         entry.media_files['webm_640'] = medium_filepath
  87
  88         # Save the width and height of the transcoded video
  89         entry.media_data['video'] = {
  90             u'width': transcoder.dst_data.videowidth,
  91             u'height': transcoder.dst_data.videoheight}
  92
  93     # Create a temporary file for the video thumbnail
  94     tmp_thumb = tempfile.NamedTemporaryFile()
  95
  96     with tmp_thumb:
  97         # Create a thumbnail.jpg that fits in a 180x180 square
  98         transcoders.VideoThumbnailer(queued_filename, tmp_thumb.name)
  99
 100         # Push the thumbnail to public storage
 101         _log.debug('Saving thumbnail...')
 102         mgg.public_store.get_file(thumbnail_filepath, 'wb').write(
 103             tmp_thumb.read())
 104         _log.debug('Saved thumbnail')
 105
 106         entry.media_files['thumb'] = thumbnail_filepath
 107
 108     if video_config['keep_original']:
 109         # Push original file to public storage
 110         queued_file = file(queued_filename, 'rb')
 111
 112         with queued_file:
 113             original_filepath = create_pub_filepath(
 114                 entry,
 115                 queued_filepath[-1])
 116
 117             with mgg.public_store.get_file(original_filepath, 'wb') as \
 118                     original_file:
 119                 _log.debug('Saving original...')
 120                 original_file.write(queued_file.read())
 121                 _log.debug('Saved original')
 122
 123                 entry.media_files['original'] = original_filepath
 124
 125     mgg.queue_store.delete_file(queued_filepath)
 126
 127     # Save the MediaEntry
 128     entry.save()