smooth-dl.py: add support for downloading chunks with the 'd' attribute

diff --git a/smooth-dl.py b/smooth-dl.py
index 41dfc4c..4fdbca1 100755 (executable)
--- a/smooth-dl.py
+++ b/smooth-dl.py
@@ -199,10 +199,9 @@ def get_chunk_quality_string(stream, quality_level):
     return chunks_quality
 
 
-def get_chunk_name_string(stream, chunk):
-    t = chunk.attrib["t"]
+def get_chunk_name_string(stream, chunk_time):
     url = stream.attrib["Url"]
-    chunk_name = url.split('/')[1].replace("{start time}", t)
+    chunk_name = url.split('/')[1].replace("{start time}", str(chunk_time))
 
     return chunk_name
 
@@ -225,9 +224,17 @@ def download_chunks(base_url, manifest, stream_index, quality_level, dest_dir):
     print "\nDownloading Stream %d" % stream_index
     print "\tChunks %10d/%-10d" % (0, len(chunks)), "\r",
     sys.stdout.flush()
-    for i, c in enumerate(chunks):
 
-        chunk_name = get_chunk_name_string(stream, c)
+    stream_duration = 0
+    for i, chunk in enumerate(chunks):
+
+        if "t" in chunk.attrib:
+            chunk_time = chunk.attrib["t"]
+        elif "d" in chunk.attrib:
+            chunk_time = stream_duration
+            stream_duration = chunk_time + int(chunk.attrib["d"])
+
+        chunk_name = get_chunk_name_string(stream, chunk_time)
         chunk_file = os.path.join(dest_dir, chunks_quality, chunk_name)
 
         if not os.path.exists(chunk_file):
@@ -263,9 +270,17 @@ def rebuild_stream(manifest, stream_index, quality_level, src_dir,
     print "\nRebuilding Stream %d" % stream_index
     print "\tChunks %10d/%-10d" % (0, len(chunks)), "\r",
     sys.stdout.flush()
-    for i, c in enumerate(chunks):
 
-        chunk_name = get_chunk_name_string(stream, c)
+    stream_duration = 0
+    for i, chunk in enumerate(chunks):
+
+        if "t" in chunk.attrib:
+            chunk_time = chunk.attrib["t"]
+        elif "d" in chunk.attrib:
+            chunk_time = stream_duration
+            stream_duration = chunk_time + int(chunk.attrib["d"])
+
+        chunk_name = get_chunk_name_string(stream, chunk_time)
         chunk_file = os.path.join(chunks_src_dir, chunk_name)
 
         f = open(chunk_file, "rb")
@@ -308,9 +323,16 @@ def calc_tracks_delay(manifest, stream1_index, stream2_index):
     s1 = streams[stream1_index]
     s2 = streams[stream2_index]
 
+    if "TimeScale" not in s1 or "TimeScale" not in s2:
+        return 0
+
     s1_start_chunk = s1.find("c")
     s2_start_chunk = s2.find("c")
 
+    if "t" not in s1_start_chunk.attrib \
+       or "t" not in s2_start_chunk.attrib:
+        return 0
+
     s1_start_time = int(s1_start_chunk.attrib['t'])
     s2_start_time = int(s2_start_chunk.attrib['t'])