1 from __future__ import unicode_literals
2
3 import time
4 import struct
5 import binascii
6 import io
7
8 from .fragment import FragmentFD
9 from ..compat import compat_urllib_error
10
11
12 u8 = struct.Struct(b'>B')
13 u88 = struct.Struct(b'>Bx')
14 u16 = struct.Struct(b'>H')
15 u1616 = struct.Struct(b'>Hxx')
16 u32 = struct.Struct(b'>I')
17 u64 = struct.Struct(b'>Q')
18
19 s88 = struct.Struct(b'>bx')
20 s16 = struct.Struct(b'>h')
21 s1616 = struct.Struct(b'>hxx')
22 s32 = struct.Struct(b'>i')
23
24 unity_matrix = (s32.pack(0x10000) + s32.pack(0) * 3) * 2 + s32.pack(0x40000000)
25
26 TRACK_ENABLED = 0x1
27 TRACK_IN_MOVIE = 0x2
28 TRACK_IN_PREVIEW = 0x4
29
30 SELF_CONTAINED = 0x1
31
32
33 def box(box_type, payload):
34 return u32.pack(8 + len(payload)) + box_type + payload
35
36
37 def full_box(box_type, version, flags, payload):
38 return box(box_type, u8.pack(version) + u32.pack(flags)[1:] + payload)
39
40
41 def write_piff_header(stream, params):
42 track_id = params['track_id']
43 fourcc = params['fourcc']
44 duration = params['duration']
45 timescale = params.get('timescale', 10000000)
46 language = params.get('language', 'und')
47 height = params.get('height', 0)
48 width = params.get('width', 0)
49 is_audio = width == 0 and height == 0
50 creation_time = modification_time = int(time.time())
51
52 ftyp_payload = b'isml' # major brand
53 ftyp_payload += u32.pack(1) # minor version
54 ftyp_payload += b'piff' + b'iso2' # compatible brands
55 stream.write(box(b'ftyp', ftyp_payload)) # File Type Box
56
57 mvhd_payload = u64.pack(creation_time)
58 mvhd_payload += u64.pack(modification_time)
59 mvhd_payload += u32.pack(timescale)
60 mvhd_payload += u64.pack(duration)
61 mvhd_payload += s1616.pack(1) # rate
62 mvhd_payload += s88.pack(1) # volume
63 mvhd_payload += u16.pack(0) # reserved
64 mvhd_payload += u32.pack(0) * 2 # reserved
65 mvhd_payload += unity_matrix
66 mvhd_payload += u32.pack(0) * 6 # pre defined
67 mvhd_payload += u32.pack(0xffffffff) # next track id
68 moov_payload = full_box(b'mvhd', 1, 0, mvhd_payload) # Movie Header Box
69
70 tkhd_payload = u64.pack(creation_time)
71 tkhd_payload += u64.pack(modification_time)
72 tkhd_payload += u32.pack(track_id) # track id
73 tkhd_payload += u32.pack(0) # reserved
74 tkhd_payload += u64.pack(duration)
75 tkhd_payload += u32.pack(0) * 2 # reserved
76 tkhd_payload += s16.pack(0) # layer
77 tkhd_payload += s16.pack(0) # alternate group
78 tkhd_payload += s88.pack(1 if is_audio else 0) # volume
79 tkhd_payload += u16.pack(0) # reserved
80 tkhd_payload += unity_matrix
81 tkhd_payload += u1616.pack(width)
82 tkhd_payload += u1616.pack(height)
83 trak_payload = full_box(b'tkhd', 1, TRACK_ENABLED | TRACK_IN_MOVIE | TRACK_IN_PREVIEW, tkhd_payload) # Track Header Box
84
85 mdhd_payload = u64.pack(creation_time)
86 mdhd_payload += u64.pack(modification_time)
87 mdhd_payload += u32.pack(timescale)
88 mdhd_payload += u64.pack(duration)
89 mdhd_payload += u16.pack(((ord(language[0]) - 0x60) << 10) | ((ord(language[1]) - 0x60) << 5) | (ord(language[2]) - 0x60))
90 mdhd_payload += u16.pack(0) # pre defined
91 mdia_payload = full_box(b'mdhd', 1, 0, mdhd_payload) # Media Header Box
92
93 hdlr_payload = u32.pack(0) # pre defined
94 hdlr_payload += b'soun' if is_audio else b'vide' # handler type
95 hdlr_payload += u32.pack(0) * 3 # reserved
96 hdlr_payload += (b'Sound' if is_audio else b'Video') + b'Handler\0' # name
97 mdia_payload += full_box(b'hdlr', 0, 0, hdlr_payload) # Handler Reference Box
98
99 if is_audio:
100 smhd_payload = s88.pack(0) # balance
101 smhd_payload += u16.pack(0) # reserved
102 media_header_box = full_box(b'smhd', 0, 0, smhd_payload) # Sound Media Header
103 else:
104 vmhd_payload = u16.pack(0) # graphics mode
105 vmhd_payload += u16.pack(0) * 3 # opcolor
106 media_header_box = full_box(b'vmhd', 0, 1, vmhd_payload) # Video Media Header
107 minf_payload = media_header_box
108
109 dref_payload = u32.pack(1) # entry count
110 dref_payload += full_box(b'url ', 0, SELF_CONTAINED, b'') # Data Entry URL Box
111 dinf_payload = full_box(b'dref', 0, 0, dref_payload) # Data Reference Box
112 minf_payload += box(b'dinf', dinf_payload) # Data Information Box
113
114 stsd_payload = u32.pack(1) # entry count
115
116 sample_entry_payload = u8.pack(0) * 6 # reserved
117 sample_entry_payload += u16.pack(1) # data reference index
118 if is_audio:
119 sample_entry_payload += u32.pack(0) * 2 # reserved
120 sample_entry_payload += u16.pack(params.get('channels', 2))
121 sample_entry_payload += u16.pack(params.get('bits_per_sample', 16))
122 sample_entry_payload += u16.pack(0) # pre defined
123 sample_entry_payload += u16.pack(0) # reserved
124 sample_entry_payload += u1616.pack(params['sampling_rate'])
125
126 if fourcc == 'AACL':
127 sample_entry_box = box(b'mp4a', sample_entry_payload)
128 else:
129 sample_entry_payload += u16.pack(0) # pre defined
130 sample_entry_payload += u16.pack(0) # reserved
131 sample_entry_payload += u32.pack(0) * 3 # pre defined
132 sample_entry_payload += u16.pack(width)
133 sample_entry_payload += u16.pack(height)
134 sample_entry_payload += u1616.pack(0x48) # horiz resolution 72 dpi
135 sample_entry_payload += u1616.pack(0x48) # vert resolution 72 dpi
136 sample_entry_payload += u32.pack(0) # reserved
137 sample_entry_payload += u16.pack(1) # frame count
138 sample_entry_payload += u8.pack(0) * 32 # compressor name
139 sample_entry_payload += u16.pack(0x18) # depth
140 sample_entry_payload += s16.pack(-1) # pre defined
141
142 codec_private_data = binascii.unhexlify(params['codec_private_data'])
143 if fourcc in ('H264', 'AVC1'):
144 sps, pps = codec_private_data.split(u32.pack(1))[1:]
145 avcc_payload = u8.pack(1) # configuration version
146 avcc_payload += sps[1:4] # avc profile indication + profile compatibility + avc level indication
147 avcc_payload += u8.pack(0xfc | (params.get('nal_unit_length_field', 4) - 1)) # complete represenation (1) + reserved (11111) + length size minus one
148 avcc_payload += u8.pack(1) # reserved (0) + number of sps (0000001)
149 avcc_payload += u16.pack(len(sps))
150 avcc_payload += sps
151 avcc_payload += u8.pack(1) # number of pps
152 avcc_payload += u16.pack(len(pps))
153 avcc_payload += pps
154 sample_entry_payload += box(b'avcC', avcc_payload) # AVC Decoder Configuration Record
155 sample_entry_box = box(b'avc1', sample_entry_payload) # AVC Simple Entry
156 stsd_payload += sample_entry_box
157
158 stbl_payload = full_box(b'stsd', 0, 0, stsd_payload) # Sample Description Box
159
160 stts_payload = u32.pack(0) # entry count
161 stbl_payload += full_box(b'stts', 0, 0, stts_payload) # Decoding Time to Sample Box
162
163 stsc_payload = u32.pack(0) # entry count
164 stbl_payload += full_box(b'stsc', 0, 0, stsc_payload) # Sample To Chunk Box
165
166 stco_payload = u32.pack(0) # entry count
167 stbl_payload += full_box(b'stco', 0, 0, stco_payload) # Chunk Offset Box
168
169 minf_payload += box(b'stbl', stbl_payload) # Sample Table Box
170
171 mdia_payload += box(b'minf', minf_payload) # Media Information Box
172
173 trak_payload += box(b'mdia', mdia_payload) # Media Box
174
175 moov_payload += box(b'trak', trak_payload) # Track Box
176
177 mehd_payload = u64.pack(duration)
178 mvex_payload = full_box(b'mehd', 1, 0, mehd_payload) # Movie Extends Header Box
179
180 trex_payload = u32.pack(track_id) # track id
181 trex_payload += u32.pack(1) # default sample description index
182 trex_payload += u32.pack(0) # default sample duration
183 trex_payload += u32.pack(0) # default sample size
184 trex_payload += u32.pack(0) # default sample flags
185 mvex_payload += full_box(b'trex', 0, 0, trex_payload) # Track Extends Box
186
187 moov_payload += box(b'mvex', mvex_payload) # Movie Extends Box
188 stream.write(box(b'moov', moov_payload)) # Movie Box
189
190
191 def extract_box_data(data, box_sequence):
192 data_reader = io.BytesIO(data)
193 while True:
194 box_size = u32.unpack(data_reader.read(4))[0]
195 box_type = data_reader.read(4)
196 if box_type == box_sequence[0]:
197 box_data = data_reader.read(box_size - 8)
198 if len(box_sequence) == 1:
199 return box_data
200 return extract_box_data(box_data, box_sequence[1:])
201 data_reader.seek(box_size - 8, 1)
202
203
204 class IsmFD(FragmentFD):
205 """
206 Download segments in a ISM manifest
207 """
208
209 FD_NAME = 'ism'
210
211 def real_download(self, filename, info_dict):
212 segments = info_dict['fragments'][:1] if self.params.get(
213 'test', False) else info_dict['fragments']
214
215 ctx = {
216 'filename': filename,
217 'total_frags': len(segments),
218 }
219
220 self._prepare_and_start_frag_download(ctx)
221
222 fragment_retries = self.params.get('fragment_retries', 0)
223 skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
224
225 track_written = False
226 frag_index = 0
227 for i, segment in enumerate(segments):
228 frag_index += 1
229 if frag_index <= ctx['fragment_index']:
230 continue
231 count = 0
232 while count <= fragment_retries:
233 try:
234 success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
235 if not success:
236 return False
237 if not track_written:
238 tfhd_data = extract_box_data(frag_content, [b'moof', b'traf', b'tfhd'])
239 info_dict['_download_params']['track_id'] = u32.unpack(tfhd_data[4:8])[0]
240 write_piff_header(ctx['dest_stream'], info_dict['_download_params'])
241 track_written = True
242 self._append_fragment(ctx, frag_content)
243 break
244 except compat_urllib_error.HTTPError as err:
245 count += 1
246 if count <= fragment_retries:
247 self.report_retry_fragment(err, frag_index, count, fragment_retries)
248 if count > fragment_retries:
249 if skip_unavailable_fragments:
250 self.report_skip_fragment(frag_index)
251 continue
252 self.report_error('giving up after %s fragment retries' % fragment_retries)
253 return False
254
255 self._finish_frag_download(ctx)
256
257 return True
|
