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-rw-r--r--youtube_dl/downloader/f4m.py45
1 files changed, 30 insertions, 15 deletions
diff --git a/youtube_dl/downloader/f4m.py b/youtube_dl/downloader/f4m.py
index f9f6f3e73..c460c167a 100644
--- a/youtube_dl/downloader/f4m.py
+++ b/youtube_dl/downloader/f4m.py
@@ -187,24 +187,34 @@ def build_fragments_list(boot_info):
return res
-def write_flv_header(stream, metadata):
- """Writes the FLV header and the metadata to stream"""
+def write_unsigned_int(stream, val):
+ stream.write(struct_pack('!I', val))
+
+
+def write_unsigned_int_24(stream, val):
+ stream.write(struct_pack('!I', val)[1:])
+
+
+def write_flv_header(stream):
+ """Writes the FLV header to stream"""
# FLV header
stream.write(b'FLV\x01')
stream.write(b'\x05')
stream.write(b'\x00\x00\x00\x09')
- # FLV File body
stream.write(b'\x00\x00\x00\x00')
- # FLVTAG
- # Script data
- stream.write(b'\x12')
- # Size of the metadata with 3 bytes
- stream.write(struct_pack('!L', len(metadata))[1:])
- stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
- stream.write(metadata)
- # Magic numbers extracted from the output files produced by AdobeHDS.php
- # (https://github.com/K-S-V/Scripts)
- stream.write(b'\x00\x00\x01\x73')
+
+
+def write_metadata_tag(stream, metadata):
+ """Writes optional metadata tag to stream"""
+ SCRIPT_TAG = b'\x12'
+ FLV_TAG_HEADER_LEN = 11
+
+ if metadata:
+ stream.write(SCRIPT_TAG)
+ write_unsigned_int_24(stream, len(metadata))
+ stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
+ stream.write(metadata)
+ write_unsigned_int(stream, FLV_TAG_HEADER_LEN + len(metadata))
def _add_ns(prop):
@@ -256,7 +266,11 @@ class F4mFD(FileDownloader):
bootstrap = self.ydl.urlopen(bootstrap_url).read()
else:
bootstrap = base64.b64decode(bootstrap_node.text)
- metadata = base64.b64decode(media.find(_add_ns('metadata')).text)
+ metadata_node = media.find(_add_ns('metadata'))
+ if metadata_node is not None:
+ metadata = base64.b64decode(metadata_node.text)
+ else:
+ metadata = None
boot_info = read_bootstrap_info(bootstrap)
fragments_list = build_fragments_list(boot_info)
@@ -269,7 +283,8 @@ class F4mFD(FileDownloader):
tmpfilename = self.temp_name(filename)
(dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
- write_flv_header(dest_stream, metadata)
+ write_flv_header(dest_stream)
+ write_metadata_tag(dest_stream, metadata)
# This dict stores the download progress, it's updated by the progress
# hook