|
|
- from __future__ import unicode_literals
-
- import base64
- import io
- import itertools
- import os
- import time
- import xml.etree.ElementTree as etree
-
- from .common import FileDownloader
- from .http import HttpFD
- from ..compat import (
- compat_urlparse,
- )
- from ..utils import (
- struct_pack,
- struct_unpack,
- format_bytes,
- encodeFilename,
- sanitize_open,
- xpath_text,
- )
-
-
- class FlvReader(io.BytesIO):
- """
- Reader for Flv files
- The file format is documented in https://www.adobe.com/devnet/f4v.html
- """
-
- # Utility functions for reading numbers and strings
- def read_unsigned_long_long(self):
- return struct_unpack('!Q', self.read(8))[0]
-
- def read_unsigned_int(self):
- return struct_unpack('!I', self.read(4))[0]
-
- def read_unsigned_char(self):
- return struct_unpack('!B', self.read(1))[0]
-
- def read_string(self):
- res = b''
- while True:
- char = self.read(1)
- if char == b'\x00':
- break
- res += char
- return res
-
- def read_box_info(self):
- """
- Read a box and return the info as a tuple: (box_size, box_type, box_data)
- """
- real_size = size = self.read_unsigned_int()
- box_type = self.read(4)
- header_end = 8
- if size == 1:
- real_size = self.read_unsigned_long_long()
- header_end = 16
- return real_size, box_type, self.read(real_size - header_end)
-
- def read_asrt(self):
- # version
- self.read_unsigned_char()
- # flags
- self.read(3)
- quality_entry_count = self.read_unsigned_char()
- # QualityEntryCount
- for i in range(quality_entry_count):
- self.read_string()
-
- segment_run_count = self.read_unsigned_int()
- segments = []
- for i in range(segment_run_count):
- first_segment = self.read_unsigned_int()
- fragments_per_segment = self.read_unsigned_int()
- segments.append((first_segment, fragments_per_segment))
-
- return {
- 'segment_run': segments,
- }
-
- def read_afrt(self):
- # version
- self.read_unsigned_char()
- # flags
- self.read(3)
- # time scale
- self.read_unsigned_int()
-
- quality_entry_count = self.read_unsigned_char()
- # QualitySegmentUrlModifiers
- for i in range(quality_entry_count):
- self.read_string()
-
- fragments_count = self.read_unsigned_int()
- fragments = []
- for i in range(fragments_count):
- first = self.read_unsigned_int()
- first_ts = self.read_unsigned_long_long()
- duration = self.read_unsigned_int()
- if duration == 0:
- discontinuity_indicator = self.read_unsigned_char()
- else:
- discontinuity_indicator = None
- fragments.append({
- 'first': first,
- 'ts': first_ts,
- 'duration': duration,
- 'discontinuity_indicator': discontinuity_indicator,
- })
-
- return {
- 'fragments': fragments,
- }
-
- def read_abst(self):
- # version
- self.read_unsigned_char()
- # flags
- self.read(3)
-
- self.read_unsigned_int() # BootstrapinfoVersion
- # Profile,Live,Update,Reserved
- self.read(1)
- # time scale
- self.read_unsigned_int()
- # CurrentMediaTime
- self.read_unsigned_long_long()
- # SmpteTimeCodeOffset
- self.read_unsigned_long_long()
-
- self.read_string() # MovieIdentifier
- server_count = self.read_unsigned_char()
- # ServerEntryTable
- for i in range(server_count):
- self.read_string()
- quality_count = self.read_unsigned_char()
- # QualityEntryTable
- for i in range(quality_count):
- self.read_string()
- # DrmData
- self.read_string()
- # MetaData
- self.read_string()
-
- segments_count = self.read_unsigned_char()
- segments = []
- for i in range(segments_count):
- box_size, box_type, box_data = self.read_box_info()
- assert box_type == b'asrt'
- segment = FlvReader(box_data).read_asrt()
- segments.append(segment)
- fragments_run_count = self.read_unsigned_char()
- fragments = []
- for i in range(fragments_run_count):
- box_size, box_type, box_data = self.read_box_info()
- assert box_type == b'afrt'
- fragments.append(FlvReader(box_data).read_afrt())
-
- return {
- 'segments': segments,
- 'fragments': fragments,
- }
-
- def read_bootstrap_info(self):
- total_size, box_type, box_data = self.read_box_info()
- assert box_type == b'abst'
- return FlvReader(box_data).read_abst()
-
-
- def read_bootstrap_info(bootstrap_bytes):
- return FlvReader(bootstrap_bytes).read_bootstrap_info()
-
-
- def build_fragments_list(boot_info):
- """ Return a list of (segment, fragment) for each fragment in the video """
- res = []
- segment_run_table = boot_info['segments'][0]
- fragment_run_entry_table = boot_info['fragments'][0]['fragments']
- first_frag_number = fragment_run_entry_table[0]['first']
- fragments_counter = itertools.count(first_frag_number)
- for segment, fragments_count in segment_run_table['segment_run']:
- for _ in range(fragments_count):
- res.append((segment, next(fragments_counter)))
- return res
-
-
- 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')
- stream.write(b'\x00\x00\x00\x00')
-
-
- 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):
- return '{http://ns.adobe.com/f4m/1.0}%s' % prop
-
-
- class HttpQuietDownloader(HttpFD):
- def to_screen(self, *args, **kargs):
- pass
-
-
- class F4mFD(FileDownloader):
- """
- A downloader for f4m manifests or AdobeHDS.
- """
-
- def _get_unencrypted_media(self, doc):
- media=doc.findall(_add_ns('media'))
- if not media:
- self.report_error('No media found')
- for e in (doc.findall(_add_ns('drmAdditionalHeader')) +
- doc.findall(_add_ns('drmAdditionalHeaderSet'))):
- # If id attribute is missing it's valid for all media nodes
- # without drmAdditionalHeaderId or drmAdditionalHeaderSetId attribute
- if 'id' not in e.attrib:
- self.report_error('Missing ID in f4m DRM')
- media = list(filter(lambda e: 'drmAdditionalHeaderId' not in e.attrib and
- 'drmAdditionalHeaderSetId' not in e.attrib,
- media))
- if not media:
- self.report_error('Unsupported DRM')
- return media
-
- def real_download(self, filename, info_dict):
- man_url = info_dict['url']
- requested_bitrate = info_dict.get('tbr')
- self.to_screen('[download] Downloading f4m manifest')
- manifest = self.ydl.urlopen(man_url).read()
- self.report_destination(filename)
- http_dl = HttpQuietDownloader(
- self.ydl,
- {
- 'continuedl': True,
- 'quiet': True,
- 'noprogress': True,
- 'ratelimit': self.params.get('ratelimit', None),
- 'test': self.params.get('test', False),
- }
- )
-
- doc = etree.fromstring(manifest)
- formats = [(int(f.attrib.get('bitrate', -1)), f)
- for f in self._get_unencrypted_media(doc)]
- if requested_bitrate is None:
- # get the best format
- formats = sorted(formats, key=lambda f: f[0])
- rate, media = formats[-1]
- else:
- rate, media = list(filter(
- lambda f: int(f[0]) == requested_bitrate, formats))[0]
-
- base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
- bootstrap_node = doc.find(_add_ns('bootstrapInfo'))
- if bootstrap_node.text is None:
- bootstrap_url = compat_urlparse.urljoin(
- base_url, bootstrap_node.attrib['url'])
- bootstrap = self.ydl.urlopen(bootstrap_url).read()
- else:
- bootstrap = base64.b64decode(bootstrap_node.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)
- if self.params.get('test', False):
- # We only download the first fragment
- fragments_list = fragments_list[:1]
- total_frags = len(fragments_list)
- # For some akamai manifests we'll need to add a query to the fragment url
- akamai_pv = xpath_text(doc, _add_ns('pv-2.0'))
-
- tmpfilename = self.temp_name(filename)
- (dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
- write_flv_header(dest_stream)
- write_metadata_tag(dest_stream, metadata)
-
- # This dict stores the download progress, it's updated by the progress
- # hook
- state = {
- 'downloaded_bytes': 0,
- 'frag_counter': 0,
- }
- start = time.time()
-
- def frag_progress_hook(status):
- frag_total_bytes = status.get('total_bytes', 0)
- estimated_size = (state['downloaded_bytes'] +
- (total_frags - state['frag_counter']) * frag_total_bytes)
- if status['status'] == 'finished':
- state['downloaded_bytes'] += frag_total_bytes
- state['frag_counter'] += 1
- progress = self.calc_percent(state['frag_counter'], total_frags)
- byte_counter = state['downloaded_bytes']
- else:
- frag_downloaded_bytes = status['downloaded_bytes']
- byte_counter = state['downloaded_bytes'] + frag_downloaded_bytes
- frag_progress = self.calc_percent(frag_downloaded_bytes,
- frag_total_bytes)
- progress = self.calc_percent(state['frag_counter'], total_frags)
- progress += frag_progress / float(total_frags)
-
- eta = self.calc_eta(start, time.time(), estimated_size, byte_counter)
- self.report_progress(progress, format_bytes(estimated_size),
- status.get('speed'), eta)
- http_dl.add_progress_hook(frag_progress_hook)
-
- frags_filenames = []
- for (seg_i, frag_i) in fragments_list:
- name = 'Seg%d-Frag%d' % (seg_i, frag_i)
- url = base_url + name
- if akamai_pv:
- url += '?' + akamai_pv.strip(';')
- frag_filename = '%s-%s' % (tmpfilename, name)
- success = http_dl.download(frag_filename, {'url': url})
- if not success:
- return False
- with open(frag_filename, 'rb') as down:
- down_data = down.read()
- reader = FlvReader(down_data)
- while True:
- _, box_type, box_data = reader.read_box_info()
- if box_type == b'mdat':
- dest_stream.write(box_data)
- break
- frags_filenames.append(frag_filename)
-
- dest_stream.close()
- self.report_finish(format_bytes(state['downloaded_bytes']), time.time() - start)
-
- self.try_rename(tmpfilename, filename)
- for frag_file in frags_filenames:
- os.remove(frag_file)
-
- fsize = os.path.getsize(encodeFilename(filename))
- self._hook_progress({
- 'downloaded_bytes': fsize,
- 'total_bytes': fsize,
- 'filename': filename,
- 'status': 'finished',
- })
-
- return True
|