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
|
# -*- coding: utf-8 -*-
#
# This file is part of Linux Show Player
#
# Copyright 2012-2016 Francesco Ceruti <ceppofrancy@gmail.com>
#
# Linux Show Player is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Linux Show Player is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Linux Show Player. If not, see <http://www.gnu.org/licenses/>.
from abc import abstractmethod
from lisp.core.singleton import ABCSingleton
class Backend(metaclass=ABCSingleton):
"""Common interface that any backend must provide.
An __init__() method can be defined if the backend require initialization.
"""
@abstractmethod
def uri_duration(self, uri):
"""Return the file duration in milliseconds.
:param uri: The URI of the file
:type uri: str
:rtype: int
"""
@abstractmethod
def uri_tags(self, uri):
"""Return a dictionary containing the file metadata/tags.
:param uri: The URI of the file
:type uri: str
:rtype: dict
"""
@abstractmethod
def supported_extensions(self):
"""Return file extensions supported by the backend.
Extensions will be categorized in 'audio' and 'video', optionally the
backend can create others categories.
e.g. {'audio': ['wav', 'mp3', ...], 'video': ['mp4', 'mov', ...]}
:rtype: dict
"""
|
