smooth-dl: handle CustomAttributes in stream quality

Some manifest files can have CustomAttributes elements in the
QualityLevel settings, handle these. For instance on RaiReplay streams
there is a systemLanguage attribute to tell what language the audio
stream is in.

diff --git a/smooth-dl.py b/smooth-dl.py
index 2baa009..ac6e388 100755 (executable)
--- a/smooth-dl.py
+++ b/smooth-dl.py
@@ -171,11 +171,20 @@ def download_chunks(base_url, manifest, stream_index, quality_level, dest_dir):
     quality = stream.findall("QualityLevel")[quality_level]
     bitrate = quality.attrib["Bitrate"]
 
+    quality_attributes = quality.findall("CustomAttributes/Attribute")
+    custom_attributes = ""
+    for i in quality_attributes:
+        custom_attributes += "%s=%s," % (i.attrib["Name"], i.attrib["Value"])
+    custom_attributes = custom_attributes.rstrip(',')
+
     # Assume URLs are in this form:
     # Url="QualityLevels({bitrate})/Fragments(video={start time})"
+    # or
+    # Url="QualityLevels({bitrate},{CustomAttributes})/Fragments(video={start time})"
     url = stream.attrib["Url"]
 
     chunks_quality = url.split('/')[0].replace("{bitrate}", bitrate)
+    chunks_quality = chunks_quality.replace("{CustomAttributes}", custom_attributes)
     chunks_dest_dir = os.path.join(dest_dir, chunks_quality)
     if os.path.exists(chunks_dest_dir) == False:
         os.mkdir(chunks_dest_dir, 0755)
@@ -221,11 +230,20 @@ def rebuild_stream(manifest, stream_index, quality_level, src_dir,
     quality = stream.findall("QualityLevel")[quality_level]
     bitrate = quality.attrib["Bitrate"]
 
+    quality_attributes = quality.findall("CustomAttributes/Attribute")
+    custom_attributes = ""
+    for i in quality_attributes:
+        custom_attributes += "%s=%s," % (i.attrib["Name"], i.attrib["Value"])
+    custom_attributes = custom_attributes.rstrip(',')
+
     # Assume URLs are in this form:
     # Url="QualityLevels({bitrate})/Fragments(video={start time})"
+    # or
+    # Url="QualityLevels({bitrate},{CustomAttributes})/Fragments(video={start time})"
     url = stream.attrib["Url"]
 
     chunks_quality = url.split('/')[0].replace("{bitrate}", bitrate)
+    chunks_quality = chunks_quality.replace("{CustomAttributes}", custom_attributes)
     chunks_src_dir = os.path.join(src_dir, chunks_quality)
 
     dest_file = open(dest_file_name, "wb")