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[youtubedl] / youtube_dl / downloader / f4m.py
1 from __future__ import unicode_literals
2
3 import base64
4 import io
5 import itertools
6 import os
7 import time
8 import xml.etree.ElementTree as etree
9
10 from .common import FileDownloader
11 from .http import HttpFD
12 from ..compat import (
13 compat_urlparse,
14 )
15 from ..utils import (
16 struct_pack,
17 struct_unpack,
18 format_bytes,
19 encodeFilename,
20 sanitize_open,
21 xpath_text,
22 )
23
24
25 class FlvReader(io.BytesIO):
26 """
27 Reader for Flv files
28 The file format is documented in https://www.adobe.com/devnet/f4v.html
29 """
30
31 # Utility functions for reading numbers and strings
32 def read_unsigned_long_long(self):
33 return struct_unpack('!Q', self.read(8))[0]
34
35 def read_unsigned_int(self):
36 return struct_unpack('!I', self.read(4))[0]
37
38 def read_unsigned_char(self):
39 return struct_unpack('!B', self.read(1))[0]
40
41 def read_string(self):
42 res = b''
43 while True:
44 char = self.read(1)
45 if char == b'\x00':
46 break
47 res += char
48 return res
49
50 def read_box_info(self):
51 """
52 Read a box and return the info as a tuple: (box_size, box_type, box_data)
53 """
54 real_size = size = self.read_unsigned_int()
55 box_type = self.read(4)
56 header_end = 8
57 if size == 1:
58 real_size = self.read_unsigned_long_long()
59 header_end = 16
60 return real_size, box_type, self.read(real_size - header_end)
61
62 def read_asrt(self):
63 # version
64 self.read_unsigned_char()
65 # flags
66 self.read(3)
67 quality_entry_count = self.read_unsigned_char()
68 # QualityEntryCount
69 for i in range(quality_entry_count):
70 self.read_string()
71
72 segment_run_count = self.read_unsigned_int()
73 segments = []
74 for i in range(segment_run_count):
75 first_segment = self.read_unsigned_int()
76 fragments_per_segment = self.read_unsigned_int()
77 segments.append((first_segment, fragments_per_segment))
78
79 return {
80 'segment_run': segments,
81 }
82
83 def read_afrt(self):
84 # version
85 self.read_unsigned_char()
86 # flags
87 self.read(3)
88 # time scale
89 self.read_unsigned_int()
90
91 quality_entry_count = self.read_unsigned_char()
92 # QualitySegmentUrlModifiers
93 for i in range(quality_entry_count):
94 self.read_string()
95
96 fragments_count = self.read_unsigned_int()
97 fragments = []
98 for i in range(fragments_count):
99 first = self.read_unsigned_int()
100 first_ts = self.read_unsigned_long_long()
101 duration = self.read_unsigned_int()
102 if duration == 0:
103 discontinuity_indicator = self.read_unsigned_char()
104 else:
105 discontinuity_indicator = None
106 fragments.append({
107 'first': first,
108 'ts': first_ts,
109 'duration': duration,
110 'discontinuity_indicator': discontinuity_indicator,
111 })
112
113 return {
114 'fragments': fragments,
115 }
116
117 def read_abst(self):
118 # version
119 self.read_unsigned_char()
120 # flags
121 self.read(3)
122
123 self.read_unsigned_int() # BootstrapinfoVersion
124 # Profile,Live,Update,Reserved
125 self.read(1)
126 # time scale
127 self.read_unsigned_int()
128 # CurrentMediaTime
129 self.read_unsigned_long_long()
130 # SmpteTimeCodeOffset
131 self.read_unsigned_long_long()
132
133 self.read_string() # MovieIdentifier
134 server_count = self.read_unsigned_char()
135 # ServerEntryTable
136 for i in range(server_count):
137 self.read_string()
138 quality_count = self.read_unsigned_char()
139 # QualityEntryTable
140 for i in range(quality_count):
141 self.read_string()
142 # DrmData
143 self.read_string()
144 # MetaData
145 self.read_string()
146
147 segments_count = self.read_unsigned_char()
148 segments = []
149 for i in range(segments_count):
150 box_size, box_type, box_data = self.read_box_info()
151 assert box_type == b'asrt'
152 segment = FlvReader(box_data).read_asrt()
153 segments.append(segment)
154 fragments_run_count = self.read_unsigned_char()
155 fragments = []
156 for i in range(fragments_run_count):
157 box_size, box_type, box_data = self.read_box_info()
158 assert box_type == b'afrt'
159 fragments.append(FlvReader(box_data).read_afrt())
160
161 return {
162 'segments': segments,
163 'fragments': fragments,
164 }
165
166 def read_bootstrap_info(self):
167 total_size, box_type, box_data = self.read_box_info()
168 assert box_type == b'abst'
169 return FlvReader(box_data).read_abst()
170
171
172 def read_bootstrap_info(bootstrap_bytes):
173 return FlvReader(bootstrap_bytes).read_bootstrap_info()
174
175
176 def build_fragments_list(boot_info):
177 """ Return a list of (segment, fragment) for each fragment in the video """
178 res = []
179 segment_run_table = boot_info['segments'][0]
180 fragment_run_entry_table = boot_info['fragments'][0]['fragments']
181 first_frag_number = fragment_run_entry_table[0]['first']
182 fragments_counter = itertools.count(first_frag_number)
183 for segment, fragments_count in segment_run_table['segment_run']:
184 for _ in range(fragments_count):
185 res.append((segment, next(fragments_counter)))
186 return res
187
188
189 def write_unsigned_int(stream, val):
190 stream.write(struct_pack('!I', val))
191
192
193 def write_unsigned_int_24(stream, val):
194 stream.write(struct_pack('!I', val)[1:])
195
196
197 def write_flv_header(stream):
198 """Writes the FLV header to stream"""
199 # FLV header
200 stream.write(b'FLV\x01')
201 stream.write(b'\x05')
202 stream.write(b'\x00\x00\x00\x09')
203 stream.write(b'\x00\x00\x00\x00')
204
205
206 def write_metadata_tag(stream, metadata):
207 """Writes optional metadata tag to stream"""
208 SCRIPT_TAG = b'\x12'
209 FLV_TAG_HEADER_LEN = 11
210
211 if metadata:
212 stream.write(SCRIPT_TAG)
213 write_unsigned_int_24(stream, len(metadata))
214 stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
215 stream.write(metadata)
216 write_unsigned_int(stream, FLV_TAG_HEADER_LEN + len(metadata))
217
218
219 def _add_ns(prop):
220 return '{http://ns.adobe.com/f4m/1.0}%s' % prop
221
222
223 class HttpQuietDownloader(HttpFD):
224 def to_screen(self, *args, **kargs):
225 pass
226
227
228 class F4mFD(FileDownloader):
229 """
230 A downloader for f4m manifests or AdobeHDS.
231 """
232
233 def _get_unencrypted_media(self, doc):
234 media = doc.findall(_add_ns('media'))
235 if not media:
236 self.report_error('No media found')
237 for e in (doc.findall(_add_ns('drmAdditionalHeader')) +
238 doc.findall(_add_ns('drmAdditionalHeaderSet'))):
239 # If id attribute is missing it's valid for all media nodes
240 # without drmAdditionalHeaderId or drmAdditionalHeaderSetId attribute
241 if 'id' not in e.attrib:
242 self.report_error('Missing ID in f4m DRM')
243 media = list(filter(lambda e: 'drmAdditionalHeaderId' not in e.attrib and
244 'drmAdditionalHeaderSetId' not in e.attrib,
245 media))
246 if not media:
247 self.report_error('Unsupported DRM')
248 return media
249
250 def real_download(self, filename, info_dict):
251 man_url = info_dict['url']
252 requested_bitrate = info_dict.get('tbr')
253 self.to_screen('[download] Downloading f4m manifest')
254 manifest = self.ydl.urlopen(man_url).read()
255 self.report_destination(filename)
256 http_dl = HttpQuietDownloader(
257 self.ydl,
258 {
259 'continuedl': True,
260 'quiet': True,
261 'noprogress': True,
262 'ratelimit': self.params.get('ratelimit', None),
263 'test': self.params.get('test', False),
264 }
265 )
266
267 doc = etree.fromstring(manifest)
268 formats = [(int(f.attrib.get('bitrate', -1)), f)
269 for f in self._get_unencrypted_media(doc)]
270 if requested_bitrate is None:
271 # get the best format
272 formats = sorted(formats, key=lambda f: f[0])
273 rate, media = formats[-1]
274 else:
275 rate, media = list(filter(
276 lambda f: int(f[0]) == requested_bitrate, formats))[0]
277
278 base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
279 bootstrap_node = doc.find(_add_ns('bootstrapInfo'))
280 if bootstrap_node.text is None:
281 bootstrap_url = compat_urlparse.urljoin(
282 base_url, bootstrap_node.attrib['url'])
283 bootstrap = self.ydl.urlopen(bootstrap_url).read()
284 else:
285 bootstrap = base64.b64decode(bootstrap_node.text)
286 metadata_node = media.find(_add_ns('metadata'))
287 if metadata_node is not None:
288 metadata = base64.b64decode(metadata_node.text)
289 else:
290 metadata = None
291 boot_info = read_bootstrap_info(bootstrap)
292
293 fragments_list = build_fragments_list(boot_info)
294 if self.params.get('test', False):
295 # We only download the first fragment
296 fragments_list = fragments_list[:1]
297 total_frags = len(fragments_list)
298 # For some akamai manifests we'll need to add a query to the fragment url
299 akamai_pv = xpath_text(doc, _add_ns('pv-2.0'))
300
301 tmpfilename = self.temp_name(filename)
302 (dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
303 write_flv_header(dest_stream)
304 write_metadata_tag(dest_stream, metadata)
305
306 # This dict stores the download progress, it's updated by the progress
307 # hook
308 state = {
309 'downloaded_bytes': 0,
310 'frag_counter': 0,
311 }
312 start = time.time()
313
314 def frag_progress_hook(status):
315 frag_total_bytes = status.get('total_bytes', 0)
316 estimated_size = (state['downloaded_bytes'] +
317 (total_frags - state['frag_counter']) * frag_total_bytes)
318 if status['status'] == 'finished':
319 state['downloaded_bytes'] += frag_total_bytes
320 state['frag_counter'] += 1
321 progress = self.calc_percent(state['frag_counter'], total_frags)
322 byte_counter = state['downloaded_bytes']
323 else:
324 frag_downloaded_bytes = status['downloaded_bytes']
325 byte_counter = state['downloaded_bytes'] + frag_downloaded_bytes
326 frag_progress = self.calc_percent(frag_downloaded_bytes,
327 frag_total_bytes)
328 progress = self.calc_percent(state['frag_counter'], total_frags)
329 progress += frag_progress / float(total_frags)
330
331 eta = self.calc_eta(start, time.time(), estimated_size, byte_counter)
332 self.report_progress(progress, format_bytes(estimated_size),
333 status.get('speed'), eta)
334 http_dl.add_progress_hook(frag_progress_hook)
335
336 frags_filenames = []
337 for (seg_i, frag_i) in fragments_list:
338 name = 'Seg%d-Frag%d' % (seg_i, frag_i)
339 url = base_url + name
340 if akamai_pv:
341 url += '?' + akamai_pv.strip(';')
342 frag_filename = '%s-%s' % (tmpfilename, name)
343 success = http_dl.download(frag_filename, {'url': url})
344 if not success:
345 return False
346 with open(frag_filename, 'rb') as down:
347 down_data = down.read()
348 reader = FlvReader(down_data)
349 while True:
350 _, box_type, box_data = reader.read_box_info()
351 if box_type == b'mdat':
352 dest_stream.write(box_data)
353 break
354 frags_filenames.append(frag_filename)
355
356 dest_stream.close()
357 self.report_finish(format_bytes(state['downloaded_bytes']), time.time() - start)
358
359 self.try_rename(tmpfilename, filename)
360 for frag_file in frags_filenames:
361 os.remove(frag_file)
362
363 fsize = os.path.getsize(encodeFilename(filename))
364 self._hook_progress({
365 'downloaded_bytes': fsize,
366 'total_bytes': fsize,
367 'filename': filename,
368 'status': 'finished',
369 })
370
371 return True