306 lines
10 KiB
Python
306 lines
10 KiB
Python
from __future__ import 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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from struct import unpack, pack
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import time
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import xml.etree.ElementTree as etree
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from .common import FileDownloader
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from .http import HttpFD
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from ..utils import (
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compat_urllib_request,
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compat_urlparse,
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format_bytes,
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encodeFilename,
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sanitize_open,
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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 unpack('!Q', self.read(8))[0]
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def read_unsigned_int(self):
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return unpack('!I', self.read(4))[0]
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def read_unsigned_char(self):
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return 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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# BootstrapinfoVersion
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bootstrap_info_version = self.read_unsigned_int()
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# Profile,Live,Update,Reserved
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self.read(1)
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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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# MovieIdentifier
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movie_identifier = self.read_string()
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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(server_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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}
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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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# I've only found videos with one segment
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segment_run_entry = segment_run_table['segment_run'][0]
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n_frags = segment_run_entry[1]
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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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for (i, frag_number) in zip(range(1, n_frags+1), itertools.count(first_frag_number)):
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res.append((1, frag_number))
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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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# 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(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 _add_ns(prop):
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return '{http://ns.adobe.com/f4m/1.0}%s' % prop
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class HttpQuietDownloader(HttpFD):
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def to_screen(self, *args, **kargs):
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pass
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class F4mFD(FileDownloader):
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"""
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A downloader for f4m manifests or AdobeHDS.
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"""
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def real_download(self, filename, info_dict):
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man_url = info_dict['url']
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self.to_screen('[download] Downloading f4m manifest')
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manifest = self.ydl.urlopen(man_url).read()
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self.report_destination(filename)
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http_dl = HttpQuietDownloader(self.ydl, {'continuedl': True, 'quiet': True, 'noprogress': True})
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doc = etree.fromstring(manifest)
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formats = [(int(f.attrib.get('bitrate', -1)), f) for f in doc.findall(_add_ns('media'))]
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formats = sorted(formats, key=lambda f: f[0])
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rate, media = formats[-1]
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base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
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bootstrap = base64.b64decode(doc.find(_add_ns('bootstrapInfo')).text)
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metadata = base64.b64decode(media.find(_add_ns('metadata')).text)
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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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total_frags = len(fragments_list)
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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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# This dict stores the download progress, it's updated by the progress
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# hook
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state = {
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'downloaded_bytes': 0,
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'frag_counter': 0,
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}
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start = time.time()
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def frag_progress_hook(status):
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frag_total_bytes = status.get('total_bytes', 0)
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estimated_size = (state['downloaded_bytes'] +
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(total_frags - state['frag_counter']) * frag_total_bytes)
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if status['status'] == 'finished':
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state['downloaded_bytes'] += frag_total_bytes
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state['frag_counter'] += 1
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progress = self.calc_percent(state['frag_counter'], total_frags)
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byte_counter = state['downloaded_bytes']
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else:
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frag_downloaded_bytes = status['downloaded_bytes']
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byte_counter = state['downloaded_bytes'] + frag_downloaded_bytes
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frag_progress = self.calc_percent(frag_downloaded_bytes,
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frag_total_bytes)
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progress = self.calc_percent(state['frag_counter'], total_frags)
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progress += frag_progress / float(total_frags)
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eta = self.calc_eta(start, time.time(), estimated_size, byte_counter)
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self.report_progress(progress, format_bytes(estimated_size),
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status.get('speed'), eta)
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http_dl.add_progress_hook(frag_progress_hook)
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frags_filenames = []
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for (seg_i, frag_i) in fragments_list:
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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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frag_filename = '%s-%s' % (tmpfilename, name)
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success = http_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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frags_filenames.append(frag_filename)
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self.report_finish(format_bytes(state['downloaded_bytes']), time.time() - start)
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self.try_rename(tmpfilename, filename)
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for frag_file in frags_filenames:
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os.remove(frag_file)
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fsize = os.path.getsize(encodeFilename(filename))
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self._hook_progress({
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'downloaded_bytes': fsize,
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'total_bytes': fsize,
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'filename': filename,
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'status': 'finished',
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})
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return True
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