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Merge pull request #4647 from aajanki/hds_metadata

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[downloader/f4m] Improved metadata handling
This commit is contained in:
Philipp Hagemeister 2015-01-08 16:37:49 +01:00
commit ce08a86462
1 changed files with 30 additions and 15 deletions
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45
youtube_dl/downloader/f4m.py
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@ -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