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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 ..utils import (
13 struct_pack,
14 struct_unpack,
15 compat_urlparse,
16 format_bytes,
17 encodeFilename,
18 sanitize_open,
19 xpath_text,
20 )
21
22
23 class FlvReader(io.BytesIO):
24 """
25 Reader for Flv files
26 The file format is documented in https://www.adobe.com/devnet/f4v.html
27 """
28
29 # Utility functions for reading numbers and strings
30 def read_unsigned_long_long(self):
31 return struct_unpack('!Q', self.read(8))[0]
32
33 def read_unsigned_int(self):
34 return struct_unpack('!I', self.read(4))[0]
35
36 def read_unsigned_char(self):
37 return struct_unpack('!B', self.read(1))[0]
38
39 def read_string(self):
40 res = b''
41 while True:
42 char = self.read(1)
43 if char == b'\x00':
44 break
45 res += char
46 return res
47
48 def read_box_info(self):
49 """
50 Read a box and return the info as a tuple: (box_size, box_type, box_data)
51 """
52 real_size = size = self.read_unsigned_int()
53 box_type = self.read(4)
54 header_end = 8
55 if size == 1:
56 real_size = self.read_unsigned_long_long()
57 header_end = 16
58 return real_size, box_type, self.read(real_size - header_end)
59
60 def read_asrt(self):
61 # version
62 self.read_unsigned_char()
63 # flags
64 self.read(3)
65 quality_entry_count = self.read_unsigned_char()
66 # QualityEntryCount
67 for i in range(quality_entry_count):
68 self.read_string()
69
70 segment_run_count = self.read_unsigned_int()
71 segments = []
72 for i in range(segment_run_count):
73 first_segment = self.read_unsigned_int()
74 fragments_per_segment = self.read_unsigned_int()
75 segments.append((first_segment, fragments_per_segment))
76
77 return {
78 'segment_run': segments,
79 }
80
81 def read_afrt(self):
82 # version
83 self.read_unsigned_char()
84 # flags
85 self.read(3)
86 # time scale
87 self.read_unsigned_int()
88
89 quality_entry_count = self.read_unsigned_char()
90 # QualitySegmentUrlModifiers
91 for i in range(quality_entry_count):
92 self.read_string()
93
94 fragments_count = self.read_unsigned_int()
95 fragments = []
96 for i in range(fragments_count):
97 first = self.read_unsigned_int()
98 first_ts = self.read_unsigned_long_long()
99 duration = self.read_unsigned_int()
100 if duration == 0:
101 discontinuity_indicator = self.read_unsigned_char()
102 else:
103 discontinuity_indicator = None
104 fragments.append({
105 'first': first,
106 'ts': first_ts,
107 'duration': duration,
108 'discontinuity_indicator': discontinuity_indicator,
109 })
110
111 return {
112 'fragments': fragments,
113 }
114
115 def read_abst(self):
116 # version
117 self.read_unsigned_char()
118 # flags
119 self.read(3)
120
121 self.read_unsigned_int() # BootstrapinfoVersion
122 # Profile,Live,Update,Reserved
123 self.read(1)
124 # time scale
125 self.read_unsigned_int()
126 # CurrentMediaTime
127 self.read_unsigned_long_long()
128 # SmpteTimeCodeOffset
129 self.read_unsigned_long_long()
130
131 self.read_string() # MovieIdentifier
132 server_count = self.read_unsigned_char()
133 # ServerEntryTable
134 for i in range(server_count):
135 self.read_string()
136 quality_count = self.read_unsigned_char()
137 # QualityEntryTable
138 for i in range(quality_count):
139 self.read_string()
140 # DrmData
141 self.read_string()
142 # MetaData
143 self.read_string()
144
145 segments_count = self.read_unsigned_char()
146 segments = []
147 for i in range(segments_count):
148 box_size, box_type, box_data = self.read_box_info()
149 assert box_type == b'asrt'
150 segment = FlvReader(box_data).read_asrt()
151 segments.append(segment)
152 fragments_run_count = self.read_unsigned_char()
153 fragments = []
154 for i in range(fragments_run_count):
155 box_size, box_type, box_data = self.read_box_info()
156 assert box_type == b'afrt'
157 fragments.append(FlvReader(box_data).read_afrt())
158
159 return {
160 'segments': segments,
161 'fragments': fragments,
162 }
163
164 def read_bootstrap_info(self):
165 total_size, box_type, box_data = self.read_box_info()
166 assert box_type == b'abst'
167 return FlvReader(box_data).read_abst()
168
169
170 def read_bootstrap_info(bootstrap_bytes):
171 return FlvReader(bootstrap_bytes).read_bootstrap_info()
172
173
174 def build_fragments_list(boot_info):
175 """ Return a list of (segment, fragment) for each fragment in the video """
176 res = []
177 segment_run_table = boot_info['segments'][0]
178 # I've only found videos with one segment
179 segment_run_entry = segment_run_table['segment_run'][0]
180 n_frags = segment_run_entry[1]
181 fragment_run_entry_table = boot_info['fragments'][0]['fragments']
182 first_frag_number = fragment_run_entry_table[0]['first']
183 for (i, frag_number) in zip(range(1, n_frags + 1), itertools.count(first_frag_number)):
184 res.append((1, frag_number))
185 return res
186
187
188 def write_flv_header(stream, metadata):
189 """Writes the FLV header and the metadata to stream"""
190 # FLV header
191 stream.write(b'FLV\x01')
192 stream.write(b'\x05')
193 stream.write(b'\x00\x00\x00\x09')
194 # FLV File body
195 stream.write(b'\x00\x00\x00\x00')
196 # FLVTAG
197 # Script data
198 stream.write(b'\x12')
199 # Size of the metadata with 3 bytes
200 stream.write(struct_pack('!L', len(metadata))[1:])
201 stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
202 stream.write(metadata)
203 # Magic numbers extracted from the output files produced by AdobeHDS.php
204 #(https://github.com/K-S-V/Scripts)
205 stream.write(b'\x00\x00\x01\x73')
206
207
208 def _add_ns(prop):
209 return '{http://ns.adobe.com/f4m/1.0}%s' % prop
210
211
212 class HttpQuietDownloader(HttpFD):
213 def to_screen(self, *args, **kargs):
214 pass
215
216
217 class F4mFD(FileDownloader):
218 """
219 A downloader for f4m manifests or AdobeHDS.
220 """
221
222 def real_download(self, filename, info_dict):
223 man_url = info_dict['url']
224 requested_bitrate = info_dict.get('tbr')
225 self.to_screen('[download] Downloading f4m manifest')
226 manifest = self.ydl.urlopen(man_url).read()
227 self.report_destination(filename)
228 http_dl = HttpQuietDownloader(
229 self.ydl,
230 {
231 'continuedl': True,
232 'quiet': True,
233 'noprogress': True,
234 'test': self.params.get('test', False),
235 }
236 )
237
238 doc = etree.fromstring(manifest)
239 formats = [(int(f.attrib.get('bitrate', -1)), f) for f in doc.findall(_add_ns('media'))]
240 if requested_bitrate is None:
241 # get the best format
242 formats = sorted(formats, key=lambda f: f[0])
243 rate, media = formats[-1]
244 else:
245 rate, media = list(filter(
246 lambda f: int(f[0]) == requested_bitrate, formats))[0]
247
248 base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
249 bootstrap_node = doc.find(_add_ns('bootstrapInfo'))
250 if bootstrap_node.text is None:
251 bootstrap_url = compat_urlparse.urljoin(
252 base_url, bootstrap_node.attrib['url'])
253 bootstrap = self.ydl.urlopen(bootstrap_url).read()
254 else:
255 bootstrap = base64.b64decode(bootstrap_node.text)
256 metadata = base64.b64decode(media.find(_add_ns('metadata')).text)
257 boot_info = read_bootstrap_info(bootstrap)
258
259 fragments_list = build_fragments_list(boot_info)
260 if self.params.get('test', False):
261 # We only download the first fragment
262 fragments_list = fragments_list[:1]
263 total_frags = len(fragments_list)
264 # For some akamai manifests we'll need to add a query to the fragment url
265 akamai_pv = xpath_text(doc, _add_ns('pv-2.0'))
266
267 tmpfilename = self.temp_name(filename)
268 (dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
269 write_flv_header(dest_stream, metadata)
270
271 # This dict stores the download progress, it's updated by the progress
272 # hook
273 state = {
274 'downloaded_bytes': 0,
275 'frag_counter': 0,
276 }
277 start = time.time()
278
279 def frag_progress_hook(status):
280 frag_total_bytes = status.get('total_bytes', 0)
281 estimated_size = (state['downloaded_bytes'] +
282 (total_frags - state['frag_counter']) * frag_total_bytes)
283 if status['status'] == 'finished':
284 state['downloaded_bytes'] += frag_total_bytes
285 state['frag_counter'] += 1
286 progress = self.calc_percent(state['frag_counter'], total_frags)
287 byte_counter = state['downloaded_bytes']
288 else:
289 frag_downloaded_bytes = status['downloaded_bytes']
290 byte_counter = state['downloaded_bytes'] + frag_downloaded_bytes
291 frag_progress = self.calc_percent(frag_downloaded_bytes,
292 frag_total_bytes)
293 progress = self.calc_percent(state['frag_counter'], total_frags)
294 progress += frag_progress / float(total_frags)
295
296 eta = self.calc_eta(start, time.time(), estimated_size, byte_counter)
297 self.report_progress(progress, format_bytes(estimated_size),
298 status.get('speed'), eta)
299 http_dl.add_progress_hook(frag_progress_hook)
300
301 frags_filenames = []
302 for (seg_i, frag_i) in fragments_list:
303 name = 'Seg%d-Frag%d' % (seg_i, frag_i)
304 url = base_url + name
305 if akamai_pv:
306 url += '?' + akamai_pv.strip(';')
307 frag_filename = '%s-%s' % (tmpfilename, name)
308 success = http_dl.download(frag_filename, {'url': url})
309 if not success:
310 return False
311 with open(frag_filename, 'rb') as down:
312 down_data = down.read()
313 reader = FlvReader(down_data)
314 while True:
315 _, box_type, box_data = reader.read_box_info()
316 if box_type == b'mdat':
317 dest_stream.write(box_data)
318 break
319 frags_filenames.append(frag_filename)
320
321 dest_stream.close()
322 self.report_finish(format_bytes(state['downloaded_bytes']), time.time() - start)
323
324 self.try_rename(tmpfilename, filename)
325 for frag_file in frags_filenames:
326 os.remove(frag_file)
327
328 fsize = os.path.getsize(encodeFilename(filename))
329 self._hook_progress({
330 'downloaded_bytes': fsize,
331 'total_bytes': fsize,
332 'filename': filename,
333 'status': 'finished',
334 })
335
336 return True