Merge pull request #5981 from edx/mobile/MA-141

MA-141 Support webm encoding for VAL-enabled videos

common/lib/xmodule/xmodule/video_module/video_module.py

@@ -184,20 +184,26 @@ class VideoModule(VideoFields, VideoTranscriptsMixin, VideoStudentViewHandlers,
         # stream.
         if self.edx_video_id and edxval_api:
             try:
-                val_video_urls = edxval_api.get_urls_for_profiles(
-                    self.edx_video_id, ["desktop_mp4", "youtube"]
-                )
+                val_profiles = ["youtube", "desktop_webm", "desktop_mp4"]
+                val_video_urls = edxval_api.get_urls_for_profiles(self.edx_video_id, val_profiles)
+
                 # VAL will always give us the keys for the profiles we asked for, but
                 # if it doesn't have an encoded video entry for that Video + Profile, the
                 # value will map to `None`
-                if val_video_urls["desktop_mp4"]:
+
+                # add the non-youtube urls to the list of alternative sources
+                # use the last non-None non-youtube url as the link to download the video
+                for url in [val_video_urls[p] for p in val_profiles if p != "youtube"]:
+                    if url:
+                        if url not in sources:
+                            sources.append(url)
                         if self.download_video:
-                        download_video_link = val_video_urls["desktop_mp4"]
-                    # add the desktop_mp4 profile to the list of alternative sources
-                    if val_video_urls["desktop_mp4"] not in sources:
-                        sources.append(val_video_urls["desktop_mp4"])
+                            download_video_link = url
+
+                # set the youtube url
                 if val_video_urls["youtube"]:
                     youtube_streams = "1.00:{}".format(val_video_urls["youtube"])
+
             except edxval_api.ValInternalError:
                 # VAL raises this exception if it can't find data for the edx video ID. This can happen if the
                 # course data is ported to a machine that does not have the VAL data. So for now, pass on this

lms/djangoapps/courseware/tests/test_video_mongo.py

@@ -512,28 +512,33 @@ class TestGetHtmlMethod(BaseTestXmodule):
         )
 
     def test_get_html_with_existing_edx_video_id(self):
+        # create test profiles and their encodings
+        encoded_videos = []
+        for profile, extension in [("desktop_webm", "webm"), ("desktop_mp4", "mp4")]:
             result = create_profile(
                 dict(
-                profile_name="desktop_mp4",
-                extension="mp4",
+                    profile_name=profile,
+                    extension=extension,
                     width=200,
                     height=2001
                 )
             )
-        self.assertEqual(result, "desktop_mp4")
+            self.assertEqual(result, profile)
+            encoded_videos.append(
+                dict(
+                    url=u"http://fake-video.edx.org/thundercats.{}".format(extension),
+                    file_size=9000,
+                    bitrate=42,
+                    profile=profile,
+                )
+            )
+
         result = create_video(
             dict(
                 client_video_id="Thunder Cats",
                 duration=111,
                 edx_video_id="thundercats",
-                encoded_videos=[
-                    dict(
-                        url=u"http://fake-video.edx.org/thundercats.mp4",
-                        file_size=9000,
-                        bitrate=42,
-                        profile="desktop_mp4",
-                    )
-                ]
+                encoded_videos=encoded_videos
             )
         )
         self.assertEqual(result, "thundercats")
@@ -549,6 +554,7 @@ class TestGetHtmlMethod(BaseTestXmodule):
                 {sources}
             </video>
         """
+
         data = {
             'download_video': 'true',
             'source': 'example_source.mp4',
@@ -559,8 +565,11 @@ class TestGetHtmlMethod(BaseTestXmodule):
             'edx_video_id': "thundercats",
             'result': {
                 'download_video_link': u'http://fake-video.edx.org/thundercats.mp4',
-                # make sure the desktop_mp4 url is included as part of the alternative sources.
-                'sources': json.dumps([u'example.mp4', u'example.webm', u"http://fake-video.edx.org/thundercats.mp4"]),
+                # make sure the urls for the various encodings are included as part of the alternative sources.
+                'sources': json.dumps(
+                    [u'example.mp4', u'example.webm'] +
+                    [video['url'] for video in encoded_videos]
+                ),
             }
         }