Merge branch 'master' into 201207-testfixes

[mediagoblin.git] / mediagoblin / media_types / __init__.py

diff --git a/mediagoblin/media_types/__init__.py b/mediagoblin/media_types/__init__.py
index 7b9bf0d730cec7df3aab83583436b9f2a3be1fbe..93d2319fbb73b2bddb3c8d7e25cf0a1d4d0463a4 100644 (file)
--- a/mediagoblin/media_types/__init__.py
+++ b/mediagoblin/media_types/__init__.py
@@ -1,5 +1,5 @@
 # GNU MediaGoblin -- federated, autonomous media hosting
-# Copyright (C) 2011 MediaGoblin contributors.  See AUTHORS.
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -16,10 +16,13 @@
 
 import os
 import sys
+import logging
+import tempfile
 
 from mediagoblin import mg_globals
 from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
 
+_log = logging.getLogger(__name__)
 
 class FileTypeNotSupported(Exception):
     pass
@@ -28,6 +31,35 @@ class InvalidFileType(Exception):
     pass
 
 
+def sniff_media(media):
+    '''
+    Iterate through the enabled media types and find those suited
+    for a certain file.
+    '''
+
+    try:
+        return get_media_type_and_manager(media.filename)
+    except FileTypeNotSupported:
+        _log.info('No media handler found by file extension. Doing it the expensive way...')
+        # Create a temporary file for sniffers suchs as GStreamer-based
+        # Audio video
+        media_file = tempfile.NamedTemporaryFile()
+        media_file.write(media.file.read())
+        media.file.seek(0)
+
+        for media_type, manager in get_media_managers():
+            _log.info('Sniffing {0}'.format(media_type))
+            if manager['sniff_handler'](media_file, media=media):
+                _log.info('{0} accepts the file'.format(media_type))
+                return media_type, manager
+            else:
+                _log.debug('{0} did not accept the file'.format(media_type))
+
+    raise FileTypeNotSupported(
+        # TODO: Provide information on which file types are supported
+        _(u'Sorry, I don\'t support that file type :('))
+
+
 def get_media_types():
     """
     Generator, yields the available media types
@@ -42,7 +74,7 @@ def get_media_managers():
     '''
     for media_type in get_media_types():
         __import__(media_type)
-            
+
         yield media_type, sys.modules[media_type].MEDIA_MANAGER
 
 
@@ -67,22 +99,22 @@ def get_media_manager(_media_type):
 
 def get_media_type_and_manager(filename):
     '''
-    Get the media type and manager based on a filename
+    Try to find the media type based on the file name, extension
+    specifically. This is used as a speedup, the sniffing functionality
+    then falls back on more in-depth bitsniffing of the source file.
     '''
     if filename.find('.') > 0:
         # Get the file extension
         ext = os.path.splitext(filename)[1].lower()
-    else:
-        raise Exception(
-            _(u'Could not extract any file extension from "{filename}"').format(
-                filename=filename))
 
-    for media_type, manager in get_media_managers():
-        # Omit the dot from the extension and match it against
-        # the media manager
-        if ext[1:] in manager['accepted_extensions']:
-            return media_type, manager
+        for media_type, manager in get_media_managers():
+            # Omit the dot from the extension and match it against
+            # the media manager
+            if ext[1:] in manager['accepted_extensions']:
+                return media_type, manager
     else:
-        raise FileTypeNotSupported(
-            # TODO: Provide information on which file types are supported
-            _(u'Sorry, I don\'t support that file type :('))
+        _log.info('File {0} has no file extension, let\'s hope the sniffers get it.'.format(
+            filename))
+
+    raise FileTypeNotSupported(
+        _(u'Sorry, I don\'t support that file type :('))