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""" |
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ffmpeg_streaming.media |
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~~~~~~~~~~~~ |
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Auto Generate Representation and Representation Object |
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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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from ._format import Format |
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from ._media_property import Size, Bitrate |
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MINIMUM_BITRATE = 65536 |
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class Representation: |
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def __init__(self, size: Size, bitrate: Bitrate): |
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self.size = size |
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self.bitrate = bitrate |
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def min_bitrate(bitrate: int) -> int: |
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if bitrate < MINIMUM_BITRATE: |
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return MINIMUM_BITRATE |
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return bitrate |
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def reduce_bitrate(bitrate: Bitrate, divide: int) -> Bitrate: |
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if divide == 1: |
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return bitrate |
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divide = 1 + divide / 2 |
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overall = min_bitrate(int(bitrate.overall_ / divide)) |
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video = min_bitrate(int(bitrate.video_ / divide)) if bitrate.video_ is not None and bitrate.video_ != 0 else None |
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audio = min_bitrate(int(bitrate.audio_ / divide)) if bitrate.audio_ is not None and bitrate.audio_ != 0 else None |
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return Bitrate(video, audio, overall) |
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def cal_bitrate(bitrate, org_bitrate: Bitrate, index: int) -> Bitrate: |
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return bitrate[index - 1] if bitrate is not None else reduce_bitrate(org_bitrate, index) |
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class AutoRep(object): |
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def __init__(self, original_size: Size, original_bitrate: Bitrate, _format: Format, heights: list = None, bitrate: list = None): |
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self.original_bitrate = original_bitrate |
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self.original_size = original_size |
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self._format = _format |
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self.heights = heights if heights is not None else [2160, 1440, 1080, 720, 480, 360, 240, 144] |
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self.bitrate = bitrate |
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self.is_default = True if heights is not None and bitrate is not None else False |
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if heights is not None and bitrate is not None and len(heights) != len(bitrate): |
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raise ValueError("The length of heights list must the same as length of bitrate") |
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def __iter__(self): |
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if not self.is_default: |
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height = self.original_size.ratio.calculate_height(self.original_size.width, self._format.multiply()) |
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self.heights = [height] + list(filter(lambda x: x < height, self.heights)) |
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self.index = 0 |
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return self |
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def __next__(self): |
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if self.index < len(self.heights): |
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height = self.heights[self.index] |
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width = self.original_size.ratio.calculate_width(height, self._format.multiply()) |
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self.index += 1 |
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return Representation(Size(width, height), cal_bitrate(self.bitrate, self.original_bitrate, self.index)) |
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else: |
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raise StopIteration |
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__all__ = [ |
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'Representation' |
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] |
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aminyazdanpanah /
python-ffmpeg-video-streaming
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