mirror of
https://github.com/yt-dlp/yt-dlp.git
synced 2024-12-15 10:05:24 +01:00
381 lines
12 KiB
Python
381 lines
12 KiB
Python
from __future__ import division, unicode_literals
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import base64
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import io
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import itertools
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import os
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import time
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import xml.etree.ElementTree as etree
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from .fragment import FragmentFD
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from ..compat import (
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compat_urlparse,
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compat_urllib_error,
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)
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from ..utils import (
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struct_pack,
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struct_unpack,
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xpath_text,
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)
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class FlvReader(io.BytesIO):
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"""
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Reader for Flv files
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The file format is documented in https://www.adobe.com/devnet/f4v.html
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"""
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# Utility functions for reading numbers and strings
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def read_unsigned_long_long(self):
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return struct_unpack('!Q', self.read(8))[0]
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def read_unsigned_int(self):
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return struct_unpack('!I', self.read(4))[0]
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def read_unsigned_char(self):
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return struct_unpack('!B', self.read(1))[0]
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def read_string(self):
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res = b''
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while True:
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char = self.read(1)
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if char == b'\x00':
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break
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res += char
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return res
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def read_box_info(self):
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"""
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Read a box and return the info as a tuple: (box_size, box_type, box_data)
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"""
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real_size = size = self.read_unsigned_int()
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box_type = self.read(4)
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header_end = 8
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if size == 1:
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real_size = self.read_unsigned_long_long()
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header_end = 16
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return real_size, box_type, self.read(real_size - header_end)
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def read_asrt(self):
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# version
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self.read_unsigned_char()
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# flags
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self.read(3)
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quality_entry_count = self.read_unsigned_char()
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# QualityEntryCount
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for i in range(quality_entry_count):
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self.read_string()
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segment_run_count = self.read_unsigned_int()
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segments = []
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for i in range(segment_run_count):
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first_segment = self.read_unsigned_int()
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fragments_per_segment = self.read_unsigned_int()
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segments.append((first_segment, fragments_per_segment))
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return {
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'segment_run': segments,
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}
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def read_afrt(self):
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# version
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self.read_unsigned_char()
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# flags
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self.read(3)
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# time scale
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self.read_unsigned_int()
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quality_entry_count = self.read_unsigned_char()
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# QualitySegmentUrlModifiers
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for i in range(quality_entry_count):
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self.read_string()
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fragments_count = self.read_unsigned_int()
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fragments = []
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for i in range(fragments_count):
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first = self.read_unsigned_int()
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first_ts = self.read_unsigned_long_long()
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duration = self.read_unsigned_int()
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if duration == 0:
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discontinuity_indicator = self.read_unsigned_char()
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else:
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discontinuity_indicator = None
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fragments.append({
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'first': first,
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'ts': first_ts,
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'duration': duration,
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'discontinuity_indicator': discontinuity_indicator,
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})
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return {
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'fragments': fragments,
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}
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def read_abst(self):
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# version
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self.read_unsigned_char()
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# flags
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self.read(3)
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self.read_unsigned_int() # BootstrapinfoVersion
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# Profile,Live,Update,Reserved
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flags = self.read_unsigned_char()
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live = flags & 0x20 != 0
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# time scale
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self.read_unsigned_int()
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# CurrentMediaTime
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self.read_unsigned_long_long()
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# SmpteTimeCodeOffset
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self.read_unsigned_long_long()
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self.read_string() # MovieIdentifier
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server_count = self.read_unsigned_char()
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# ServerEntryTable
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for i in range(server_count):
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self.read_string()
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quality_count = self.read_unsigned_char()
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# QualityEntryTable
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for i in range(quality_count):
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self.read_string()
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# DrmData
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self.read_string()
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# MetaData
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self.read_string()
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segments_count = self.read_unsigned_char()
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segments = []
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for i in range(segments_count):
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box_size, box_type, box_data = self.read_box_info()
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assert box_type == b'asrt'
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segment = FlvReader(box_data).read_asrt()
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segments.append(segment)
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fragments_run_count = self.read_unsigned_char()
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fragments = []
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for i in range(fragments_run_count):
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box_size, box_type, box_data = self.read_box_info()
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assert box_type == b'afrt'
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fragments.append(FlvReader(box_data).read_afrt())
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return {
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'segments': segments,
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'fragments': fragments,
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'live': live,
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}
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def read_bootstrap_info(self):
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total_size, box_type, box_data = self.read_box_info()
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assert box_type == b'abst'
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return FlvReader(box_data).read_abst()
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def read_bootstrap_info(bootstrap_bytes):
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return FlvReader(bootstrap_bytes).read_bootstrap_info()
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def build_fragments_list(boot_info):
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""" Return a list of (segment, fragment) for each fragment in the video """
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res = []
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segment_run_table = boot_info['segments'][0]
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fragment_run_entry_table = boot_info['fragments'][0]['fragments']
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first_frag_number = fragment_run_entry_table[0]['first']
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fragments_counter = itertools.count(first_frag_number)
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for segment, fragments_count in segment_run_table['segment_run']:
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for _ in range(fragments_count):
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res.append((segment, next(fragments_counter)))
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if boot_info['live']:
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res = res[-2:]
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return res
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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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stream.write(b'\x00\x00\x00\x00')
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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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return '{http://ns.adobe.com/f4m/1.0}%s' % prop
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class F4mFD(FragmentFD):
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"""
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A downloader for f4m manifests or AdobeHDS.
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"""
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FD_NAME = 'f4m'
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def _get_unencrypted_media(self, doc):
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media = doc.findall(_add_ns('media'))
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if not media:
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self.report_error('No media found')
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for e in (doc.findall(_add_ns('drmAdditionalHeader')) +
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doc.findall(_add_ns('drmAdditionalHeaderSet'))):
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# If id attribute is missing it's valid for all media nodes
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# without drmAdditionalHeaderId or drmAdditionalHeaderSetId attribute
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if 'id' not in e.attrib:
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self.report_error('Missing ID in f4m DRM')
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media = list(filter(lambda e: 'drmAdditionalHeaderId' not in e.attrib and
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'drmAdditionalHeaderSetId' not in e.attrib,
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media))
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if not media:
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self.report_error('Unsupported DRM')
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return media
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def _get_bootstrap_from_url(self, bootstrap_url):
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bootstrap = self.ydl.urlopen(bootstrap_url).read()
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return read_bootstrap_info(bootstrap)
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def _update_live_fragments(self, bootstrap_url, latest_fragment):
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fragments_list = []
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retries = 30
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while (not fragments_list) and (retries > 0):
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boot_info = self._get_bootstrap_from_url(bootstrap_url)
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fragments_list = build_fragments_list(boot_info)
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fragments_list = [f for f in fragments_list if f[1] > latest_fragment]
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if not fragments_list:
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# Retry after a while
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time.sleep(5.0)
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retries -= 1
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if not fragments_list:
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self.report_error('Failed to update fragments')
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return fragments_list
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def _parse_bootstrap_node(self, node, base_url):
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if node.text is None:
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bootstrap_url = compat_urlparse.urljoin(
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base_url, node.attrib['url'])
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boot_info = self._get_bootstrap_from_url(bootstrap_url)
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else:
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bootstrap_url = None
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bootstrap = base64.b64decode(node.text.encode('ascii'))
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boot_info = read_bootstrap_info(bootstrap)
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return (boot_info, bootstrap_url)
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def real_download(self, filename, info_dict):
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man_url = info_dict['url']
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requested_bitrate = info_dict.get('tbr')
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self.to_screen('[%s] Downloading f4m manifest' % self.FD_NAME)
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manifest = self.ydl.urlopen(man_url).read()
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doc = etree.fromstring(manifest)
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formats = [(int(f.attrib.get('bitrate', -1)), f)
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for f in self._get_unencrypted_media(doc)]
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if requested_bitrate is None:
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# get the best format
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formats = sorted(formats, key=lambda f: f[0])
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rate, media = formats[-1]
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else:
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rate, media = list(filter(
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lambda f: int(f[0]) == requested_bitrate, formats))[0]
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base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
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bootstrap_node = doc.find(_add_ns('bootstrapInfo'))
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boot_info, bootstrap_url = self._parse_bootstrap_node(bootstrap_node, base_url)
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live = boot_info['live']
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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.encode('ascii'))
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else:
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metadata = None
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fragments_list = build_fragments_list(boot_info)
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if self.params.get('test', False):
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# We only download the first fragment
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fragments_list = fragments_list[:1]
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total_frags = len(fragments_list)
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# For some akamai manifests we'll need to add a query to the fragment url
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akamai_pv = xpath_text(doc, _add_ns('pv-2.0'))
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ctx = {
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'filename': filename,
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'total_frags': total_frags,
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}
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self._prepare_frag_download(ctx)
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dest_stream = ctx['dest_stream']
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write_flv_header(dest_stream)
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if not live:
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write_metadata_tag(dest_stream, metadata)
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self._start_frag_download(ctx)
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frags_filenames = []
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while fragments_list:
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seg_i, frag_i = fragments_list.pop(0)
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name = 'Seg%d-Frag%d' % (seg_i, frag_i)
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url = base_url + name
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if akamai_pv:
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url += '?' + akamai_pv.strip(';')
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if info_dict.get('extra_param_to_segment_url'):
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url += info_dict.get('extra_param_to_segment_url')
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frag_filename = '%s-%s' % (ctx['tmpfilename'], name)
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try:
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success = ctx['dl'].download(frag_filename, {'url': url})
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if not success:
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return False
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with open(frag_filename, 'rb') as down:
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down_data = down.read()
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reader = FlvReader(down_data)
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while True:
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_, box_type, box_data = reader.read_box_info()
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if box_type == b'mdat':
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dest_stream.write(box_data)
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break
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if live:
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os.remove(frag_filename)
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else:
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frags_filenames.append(frag_filename)
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except (compat_urllib_error.HTTPError, ) as err:
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if live and (err.code == 404 or err.code == 410):
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# We didn't keep up with the live window. Continue
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# with the next available fragment.
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msg = 'Fragment %d unavailable' % frag_i
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self.report_warning(msg)
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fragments_list = []
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else:
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raise
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if not fragments_list and live and bootstrap_url:
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fragments_list = self._update_live_fragments(bootstrap_url, frag_i)
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total_frags += len(fragments_list)
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if fragments_list and (fragments_list[0][1] > frag_i + 1):
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msg = 'Missed %d fragments' % (fragments_list[0][1] - (frag_i + 1))
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self.report_warning(msg)
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self._finish_frag_download(ctx)
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for frag_file in frags_filenames:
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os.remove(frag_file)
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return True
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