1
|
|
|
""" |
2
|
|
|
ffmpeg_streaming.media |
3
|
|
|
~~~~~~~~~~~~ |
4
|
|
|
|
5
|
|
|
Auto Generate Representation and Representation Object |
6
|
|
|
|
7
|
|
|
|
8
|
|
|
:copyright: (c) 2020 by Amin Yazdanpanah. |
9
|
|
|
:website: https://www.aminyazdanpanah.com |
10
|
|
|
:email: [email protected] |
11
|
|
|
:license: MIT, see LICENSE for more details. |
12
|
|
|
""" |
13
|
|
|
from ._format import Format |
14
|
|
|
from ._media_property import Size, Bitrate |
15
|
|
|
|
16
|
|
|
MINIMUM_BITRATE = 65536 |
17
|
|
|
|
18
|
|
|
|
19
|
|
|
class Representation: |
20
|
|
|
def __init__(self, size: Size, bitrate: Bitrate, **options): |
21
|
|
|
""" |
22
|
|
|
@TODO: add documentation |
23
|
|
|
""" |
24
|
|
|
self.size = size |
25
|
|
|
self.bitrate = bitrate |
26
|
|
|
self.options = options |
27
|
|
|
|
28
|
|
|
|
29
|
|
|
def min_bitrate(bitrate: int) -> int: |
30
|
|
|
""" |
31
|
|
|
@TODO: add documentation |
32
|
|
|
""" |
33
|
|
|
return max(bitrate, MINIMUM_BITRATE) |
34
|
|
|
|
35
|
|
|
|
36
|
|
|
def reduce_bitrate(bitrate: Bitrate, divide: int) -> Bitrate: |
37
|
|
|
""" |
38
|
|
|
@TODO: add documentation |
39
|
|
|
""" |
40
|
|
|
if divide == 1: |
41
|
|
|
return bitrate |
42
|
|
|
|
43
|
|
|
divide = 1 + divide / 2 |
44
|
|
|
|
45
|
|
|
overall = min_bitrate(int(bitrate.overall_ / divide)) |
46
|
|
|
video = min_bitrate(int(bitrate.video_ / divide)) if bitrate.video_ is not None and bitrate.video_ != 0 else None |
47
|
|
|
audio = min_bitrate(int(bitrate.audio_ / divide)) if bitrate.audio_ is not None and bitrate.audio_ != 0 else None |
48
|
|
|
|
49
|
|
|
return Bitrate(video, audio, overall) |
50
|
|
|
|
51
|
|
|
|
52
|
|
|
def cal_bitrate(bitrate, org_bitrate: Bitrate, index: int) -> Bitrate: |
53
|
|
|
return bitrate[index - 1] if bitrate is not None else reduce_bitrate(org_bitrate, index) |
54
|
|
|
|
55
|
|
|
|
56
|
|
|
class AutoRep(object): |
57
|
|
|
def __init__(self, original_size: Size, original_bitrate: Bitrate, _format: Format, |
58
|
|
|
heights: list = None, bitrate: list = None, include_original: bool = True): |
59
|
|
|
""" |
60
|
|
|
@TODO: add documentation |
61
|
|
|
""" |
62
|
|
|
self.include_original = include_original |
63
|
|
|
self.original_bitrate = original_bitrate |
64
|
|
|
self.original_size = original_size |
65
|
|
|
self._format = _format |
66
|
|
|
self.heights = heights if heights is not None else [2160, 1440, 1080, 720, 480, 360, 240, 144] |
67
|
|
|
self.bitrate = bitrate |
68
|
|
|
self.is_default = heights is not None and bitrate is not None |
69
|
|
|
|
70
|
|
|
if heights is not None and bitrate is not None and len(heights) != len(bitrate): |
71
|
|
|
raise ValueError("The length of heights list must the same as length of bitrate") |
72
|
|
|
|
73
|
|
|
def __iter__(self): |
74
|
|
|
""" |
75
|
|
|
@TODO: add documentation |
76
|
|
|
""" |
77
|
|
|
if not self.is_default: |
78
|
|
|
height = self.original_size.ratio.calculate_height(self.original_size.width, self._format.multiply()) |
79
|
|
|
original = [height] if self.include_original else [] |
80
|
|
|
self.heights = original + list(filter(lambda x: x < height, self.heights)) |
|
|
|
|
81
|
|
|
|
82
|
|
|
self.index = 0 |
83
|
|
|
|
84
|
|
|
return self |
85
|
|
|
|
86
|
|
|
def __next__(self): |
87
|
|
|
""" |
88
|
|
|
@TODO: add documentation |
89
|
|
|
""" |
90
|
|
|
if self.index >= len(self.heights): |
91
|
|
|
raise StopIteration |
92
|
|
|
height = self.heights[self.index] |
93
|
|
|
width = self.original_size.ratio.calculate_width(height, self._format.multiply()) |
94
|
|
|
self.index += 1 |
95
|
|
|
|
96
|
|
|
return Representation(Size(width, height), cal_bitrate(self.bitrate, self.original_bitrate, self.index)) |
97
|
|
|
|
98
|
|
|
|
99
|
|
|
__all__ = [ |
100
|
|
|
'Representation' |
101
|
|
|
] |
102
|
|
|
|