1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
# -*- coding: utf-8 -*-
from __future__ import absolute_import
from .base import Type
from .isobmff import IsoBmff
class Mp4(IsoBmff):
"""
Implements the MP4 video type matcher.
"""
MIME = 'video/mp4'
EXTENSION = 'mp4'
def __init__(self):
super(Mp4, self).__init__(
mime=Mp4.MIME,
extension=Mp4.EXTENSION
)
def match(self, buf):
if not self._is_isobmff(buf):
return False
major_brand, minor_version, compatible_brands = self._get_ftyp(buf)
for brand in compatible_brands:
if brand in ['mp41', 'mp42', 'isom']:
return True
return major_brand in ['mp41', 'mp42', 'isom']
class M4v(Type):
"""
Implements the M4V video type matcher.
"""
MIME = 'video/x-m4v'
EXTENSION = 'm4v'
def __init__(self):
super(M4v, self).__init__(
mime=M4v.MIME,
extension=M4v.EXTENSION
)
def match(self, buf):
return (len(buf) > 10 and
buf[0] == 0x0 and buf[1] == 0x0 and
buf[2] == 0x0 and buf[3] == 0x1C and
buf[4] == 0x66 and buf[5] == 0x74 and
buf[6] == 0x79 and buf[7] == 0x70 and
buf[8] == 0x4D and buf[9] == 0x34 and
buf[10] == 0x56)
class Mkv(Type):
"""
Implements the MKV video type matcher.
"""
MIME = 'video/x-matroska'
EXTENSION = 'mkv'
def __init__(self):
super(Mkv, self).__init__(
mime=Mkv.MIME,
extension=Mkv.EXTENSION
)
def match(self, buf):
contains_ebml_element = buf.startswith(b'\x1A\x45\xDF\xA3')
contains_doctype_element = buf.find(b'\x42\x82\x88matroska') > -1
return contains_ebml_element and contains_doctype_element
class Webm(Type):
"""
Implements the WebM video type matcher.
"""
MIME = 'video/webm'
EXTENSION = 'webm'
def __init__(self):
super(Webm, self).__init__(
mime=Webm.MIME,
extension=Webm.EXTENSION
)
def match(self, buf):
contains_ebml_element = buf.startswith(b'\x1A\x45\xDF\xA3')
contains_doctype_element = buf.find(b'\x42\x82\x84webm') > -1
return contains_ebml_element and contains_doctype_element
class Mov(IsoBmff):
"""
Implements the MOV video type matcher.
"""
MIME = 'video/quicktime'
EXTENSION = 'mov'
def __init__(self):
super(Mov, self).__init__(
mime=Mov.MIME,
extension=Mov.EXTENSION
)
def match(self, buf):
if not self._is_isobmff(buf):
return False
major_brand, minor_version, compatible_brands = self._get_ftyp(buf)
return major_brand == 'qt '
class Avi(Type):
"""
Implements the AVI video type matcher.
"""
MIME = 'video/x-msvideo'
EXTENSION = 'avi'
def __init__(self):
super(Avi, self).__init__(
mime=Avi.MIME,
extension=Avi.EXTENSION
)
def match(self, buf):
return (len(buf) > 11 and
buf[0] == 0x52 and
buf[1] == 0x49 and
buf[2] == 0x46 and
buf[3] == 0x46 and
buf[8] == 0x41 and
buf[9] == 0x56 and
buf[10] == 0x49 and
buf[11] == 0x20)
class Wmv(Type):
"""
Implements the WMV video type matcher.
"""
MIME = 'video/x-ms-wmv'
EXTENSION = 'wmv'
def __init__(self):
super(Wmv, self).__init__(
mime=Wmv.MIME,
extension=Wmv.EXTENSION
)
def match(self, buf):
return (len(buf) > 9 and
buf[0] == 0x30 and
buf[1] == 0x26 and
buf[2] == 0xB2 and
buf[3] == 0x75 and
buf[4] == 0x8E and
buf[5] == 0x66 and
buf[6] == 0xCF and
buf[7] == 0x11 and
buf[8] == 0xA6 and
buf[9] == 0xD9)
class Flv(Type):
"""
Implements the FLV video type matcher.
"""
MIME = 'video/x-flv'
EXTENSION = 'flv'
def __init__(self):
super(Flv, self).__init__(
mime=Flv.MIME,
extension=Flv.EXTENSION
)
def match(self, buf):
return (len(buf) > 3 and
buf[0] == 0x46 and
buf[1] == 0x4C and
buf[2] == 0x56 and
buf[3] == 0x01)
class Mpeg(Type):
"""
Implements the MPEG video type matcher.
"""
MIME = 'video/mpeg'
EXTENSION = 'mpg'
def __init__(self):
super(Mpeg, self).__init__(
mime=Mpeg.MIME,
extension=Mpeg.EXTENSION
)
def match(self, buf):
return (len(buf) > 3 and
buf[0] == 0x0 and
buf[1] == 0x0 and
buf[2] == 0x1 and
buf[3] >= 0xb0 and
buf[3] <= 0xbf)
class M3gp(Type):
"""Implements the 3gp image type matcher."""
MIME = 'video/3gpp'
EXTENSION = '3gp'
def __init__(self):
super(M3gp, self).__init__(
mime=M3gp.MIME,
extension=M3gp.EXTENSION
)
def match(self, buf):
return buf[:7] == bytearray([0x66, 0x74, 0x79, 0x70, 0x33, 0x67, 0x70])
|
