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Merge pull request #4647 from aajanki/hds_metadata
[downloader/f4m] Improved metadata handling
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commit
ce08a86462
@ -187,24 +187,34 @@ def build_fragments_list(boot_info):
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return res
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def write_flv_header(stream, metadata):
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"""Writes the FLV header and the metadata to stream"""
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def write_unsigned_int(stream, val):
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stream.write(struct_pack('!I', val))
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def write_unsigned_int_24(stream, val):
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stream.write(struct_pack('!I', val)[1:])
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def write_flv_header(stream):
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"""Writes the FLV header to stream"""
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# FLV header
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stream.write(b'FLV\x01')
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stream.write(b'\x05')
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stream.write(b'\x00\x00\x00\x09')
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# FLV File body
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stream.write(b'\x00\x00\x00\x00')
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# FLVTAG
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# Script data
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stream.write(b'\x12')
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# Size of the metadata with 3 bytes
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stream.write(struct_pack('!L', len(metadata))[1:])
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stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
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stream.write(metadata)
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# Magic numbers extracted from the output files produced by AdobeHDS.php
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# (https://github.com/K-S-V/Scripts)
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stream.write(b'\x00\x00\x01\x73')
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def write_metadata_tag(stream, metadata):
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"""Writes optional metadata tag to stream"""
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SCRIPT_TAG = b'\x12'
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FLV_TAG_HEADER_LEN = 11
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if metadata:
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stream.write(SCRIPT_TAG)
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write_unsigned_int_24(stream, len(metadata))
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stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
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stream.write(metadata)
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write_unsigned_int(stream, FLV_TAG_HEADER_LEN + len(metadata))
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def _add_ns(prop):
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@ -256,7 +266,11 @@ def real_download(self, filename, info_dict):
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bootstrap = self.ydl.urlopen(bootstrap_url).read()
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else:
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bootstrap = base64.b64decode(bootstrap_node.text)
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metadata = base64.b64decode(media.find(_add_ns('metadata')).text)
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metadata_node = media.find(_add_ns('metadata'))
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if metadata_node is not None:
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metadata = base64.b64decode(metadata_node.text)
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else:
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metadata = None
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boot_info = read_bootstrap_info(bootstrap)
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fragments_list = build_fragments_list(boot_info)
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@ -269,7 +283,8 @@ def real_download(self, filename, info_dict):
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tmpfilename = self.temp_name(filename)
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(dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
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write_flv_header(dest_stream, metadata)
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write_flv_header(dest_stream)
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write_metadata_tag(dest_stream, metadata)
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# This dict stores the download progress, it's updated by the progress
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# hook
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