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""" |
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ffmpeg_streaming.media |
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~~~~~~~~~~~~ |
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Size and Bitrate Objects |
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:copyright: (c) 2020 by Amin Yazdanpanah. |
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:website: https://www.aminyazdanpanah.com |
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:email: [email protected] |
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:license: MIT, see LICENSE for more details. |
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""" |
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import math |
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OVERALL_TO_VIDEO_COEFFICIENT = 1 |
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MAX_RATE_COEFFICIENT = 1.2 |
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BUFFER_SIZE = 65536 |
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def cnv_bitrate(bitrate: int, _type: str) -> str: |
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if _type == "k": |
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bitrate = round(bitrate / 1024) |
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elif _type == "m": |
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bitrate = round(bitrate / 1024 * 1024) |
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else: |
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raise ValueError("Unknown type!") |
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return str(bitrate) + _type |
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class Bitrate: |
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def __init__(self, video: int = None, audio: int = None, overall: int = None, **kwargs): |
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""" |
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@TODO: add documentation |
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""" |
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if video is None and overall is None: |
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raise ValueError("You must at least specify value of the video or overall format") |
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self.overall_ = overall |
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self.video_ = video |
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self.audio_ = audio |
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self.kwargs = kwargs |
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self.type = kwargs.pop("type", "k") |
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@property |
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def overall(self): |
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""" |
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@TODO: add documentation |
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""" |
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return cnv_bitrate(self.overall_, self.type) if self.overall_ is not None else None |
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@property |
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def video(self): |
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""" |
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@TODO: add documentation |
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""" |
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return cnv_bitrate(self.video_, self.type) if self.video_ is not None else None |
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@property |
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def audio(self): |
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""" |
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@TODO: add documentation |
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""" |
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return cnv_bitrate(self.audio_, self.type) if self.audio_ is not None else 'copy' |
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def normalize_video(self, convert: bool = True): |
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""" |
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@TODO: add documentation |
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""" |
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if self.video_ is not None and self.video_ != 0: |
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val = self.video_ |
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else: |
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val = int(self.overall_ * OVERALL_TO_VIDEO_COEFFICIENT) |
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return cnv_bitrate(val, self.type) if convert else val |
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@property |
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def max_rate(self): |
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""" |
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@TODO: add documentation |
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""" |
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return cnv_bitrate(int(self.normalize_video(False) * MAX_RATE_COEFFICIENT), self.type) |
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@property |
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def buffer_size(self): |
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""" |
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@TODO: add documentation |
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""" |
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return cnv_bitrate(int(self.kwargs.get('buffer_size', BUFFER_SIZE)), self.type) |
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def multiple_up(value, multiple): |
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while 0 != value % multiple: |
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value += 1 |
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return value |
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def multiple_down(value, multiple): |
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while 0 != value % multiple: |
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value -= 1 |
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return value |
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class Ratio: |
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def __init__(self, width: int, height: int): |
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""" |
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@TODO: add documentation |
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""" |
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self.width = width |
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self.height = height |
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def get_value(self) -> float: |
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return self.width / self.height |
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def calculate_width(self, height: int, multiple: int = 1) -> int: |
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""" |
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@TODO: add documentation |
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""" |
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max_w = multiple_up(math.ceil(self.get_value() * height), multiple) |
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min_w = multiple_down(math.floor(self.get_value() * height), multiple) |
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max_r = abs(self.get_value() - (max_w / height)) |
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min_r = abs(self.get_value() - (min_w / height)) |
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return max_w if max_r < min_r else min_w |
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def calculate_height(self, width: int, multiple: int = 1) -> int: |
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""" |
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@TODO: add documentation |
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""" |
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max_h = multiple_up(math.ceil(width / self.get_value()), multiple) |
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min_h = multiple_down(math.floor(width / self.get_value()), multiple) |
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max_r = abs(self.get_value() - (width / max_h)) |
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min_r = abs(self.get_value() - (width / min_h)) |
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return max_h if max_r < min_r else min_h |
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class Size: |
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def __init__(self, width: int, height: int): |
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""" |
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@TODO: add documentation |
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""" |
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self.width = width |
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self.height = height |
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@property |
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def ratio(self) -> Ratio: |
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""" |
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@TODO: add documentation |
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""" |
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return Ratio(self.width, self.height) |
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@property |
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def normalize(self) -> str: |
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""" |
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@TODO: add documentation |
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""" |
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return str(self.width) + "x" + str(self.height) |
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164
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__all__ = [ |
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'Size', |
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'Bitrate' |
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] |
aminyazdanpanah /
python-ffmpeg-video-streaming
