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 mark_entry_failed, \
  23     THUMB_SIZE, MEDIUM_SIZE, create_pub_filepath
  24 from . import transcoders
  25
  26 logging.basicConfig()
  27
  28 _log = logging.getLogger(__name__)
  29 _log.setLevel(logging.DEBUG)
  30
  31 def sniff_handler(media_file, **kw):
  32     transcoder = transcoders.VideoTranscoder()
  33     try:
  34         data = transcoder.discover(media_file.name)
  35
  36         _log.debug('Discovered: {0}'.format(data.__dict__))
  37
  38         if data.is_video == True:
  39             return True
  40     except:
  41         _log.error('Exception caught when trying to discover {0}'.format(
  42                 kw.get('media')))
  43
  44     return False
  45
  46 def process_video(entry):
  47     """
  48     Process a video entry, transcode the queued media files (originals) and
  49     create a thumbnail for the entry.
  50     """
  51     video_config = mgg.global_config['media_type:mediagoblin.media_types.video']
  52
  53     workbench = mgg.workbench_manager.create_workbench()
  54
  55     queued_filepath = entry.queued_media_file
  56     queued_filename = workbench.localized_file(
  57         mgg.queue_store, queued_filepath,
  58         'source')
  59
  60     medium_filepath = create_pub_filepath(
  61         entry,
  62         '{original}-640p.webm'.format(
  63             original=os.path.splitext(
  64                 queued_filepath[-1])[0] # Select the file name without .ext
  65             ))
  66
  67     thumbnail_filepath = create_pub_filepath(
  68         entry, 'thumbnail.jpg')
  69
  70
  71     # Create a temporary file for the video destination
  72     tmp_dst = tempfile.NamedTemporaryFile()
  73
  74     with tmp_dst:
  75         # Transcode queued file to a VP8/vorbis file that fits in a 640x640 square
  76         transcoder = transcoders.VideoTranscoder()
  77         transcoder.transcode(queued_filename, tmp_dst.name)
  78
  79         # Push transcoded video to public storage
  80         _log.debug('Saving medium...')
  81         mgg.public_store.get_file(medium_filepath, 'wb').write(
  82             tmp_dst.read())
  83         _log.debug('Saved medium')
  84
  85         entry.media_files['webm_640'] = medium_filepath
  86
  87         # Save the width and height of the transcoded video
  88         entry.media_data['video'] = {
  89             u'width': transcoder.dst_data.videowidth,
  90             u'height': transcoder.dst_data.videoheight}
  91
  92     # Create a temporary file for the video thumbnail
  93     tmp_thumb = tempfile.NamedTemporaryFile()
  94
  95     with tmp_thumb:
  96         # Create a thumbnail.jpg that fits in a 180x180 square
  97         transcoders.VideoThumbnailer(queued_filename, tmp_thumb.name)
  98
  99         # Push the thumbnail to public storage
 100         _log.debug('Saving thumbnail...')
 101         mgg.public_store.get_file(thumbnail_filepath, 'wb').write(
 102             tmp_thumb.read())
 103         _log.debug('Saved thumbnail')
 104
 105         entry.media_files['thumb'] = thumbnail_filepath
 106
 107     if video_config['keep_original']:
 108         # Push original file to public storage
 109         queued_file = file(queued_filename, 'rb')
 110
 111         with queued_file:
 112             original_filepath = create_pub_filepath(
 113                 entry,
 114                 queued_filepath[-1])
 115
 116             with mgg.public_store.get_file(original_filepath, 'wb') as \
 117                     original_file:
 118                 _log.debug('Saving original...')
 119                 original_file.write(queued_file.read())
 120                 _log.debug('Saved original')
 121
 122                 entry.media_files['original'] = original_filepath
 123
 124     mgg.queue_store.delete_file(queued_filepath)
 125
 126     # Save the MediaEntry
 127     entry.save()