+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 ..utils import (
+ struct_pack,
+ struct_unpack,
+ compat_urllib_request,
+ compat_urlparse,
+ format_bytes,
+ encodeFilename,
+ sanitize_open,
+)
+
+
+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)
+ # BootstrapinfoVersion
+ bootstrap_info_version = self.read_unsigned_int()
+ # 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()
+ # MovieIdentifier
+ movie_identifier = self.read_string()
+ 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(server_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]
+ # I've only found videos with one segment
+ segment_run_entry = segment_run_table['segment_run'][0]
+ n_frags = segment_run_entry[1]
+ fragment_run_entry_table = boot_info['fragments'][0]['fragments']
+ first_frag_number = fragment_run_entry_table[0]['first']
+ for (i, frag_number) in zip(range(1, n_frags+1), itertools.count(first_frag_number)):
+ res.append((1, frag_number))
+ return res
+
+
+def write_flv_header(stream, metadata):
+ """Writes the FLV header and the metadata 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 _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 real_download(self, filename, info_dict):
+ man_url = info_dict['url']
+ 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,
+ 'test': self.params.get('test', False),
+ })
+
+ doc = etree.fromstring(manifest)
+ formats = [(int(f.attrib.get('bitrate', -1)), f) for f in doc.findall(_add_ns('media'))]
+ formats = sorted(formats, key=lambda f: f[0])
+ rate, media = formats[-1]
+ base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
+ bootstrap = base64.b64decode(doc.find(_add_ns('bootstrapInfo')).text)
+ metadata = base64.b64decode(media.find(_add_ns('metadata')).text)
+ 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)
+
+ tmpfilename = self.temp_name(filename)
+ (dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
+ write_flv_header(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
+ 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)
+
+ 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
Rapsys Git / youtubedl / commitdiff