mirror of https://github.com/yt-dlp/yt-dlp.git
23 lines
582 B
Python
23 lines
582 B
Python
def what(file=None, h=None):
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"""Detect format of image (Currently supports jpeg, png, webp, gif only)
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Ref: https://github.com/python/cpython/blob/3.11/Lib/imghdr.py
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Ref: https://www.w3.org/Graphics/JPEG/itu-t81.pdf
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"""
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if h is None:
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with open(file, 'rb') as f:
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h = f.read(12)
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if h.startswith(b'RIFF') and h.startswith(b'WEBP', 8):
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return 'webp'
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if h.startswith(b'\x89PNG'):
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return 'png'
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if h.startswith(b'\xFF\xD8\xFF'):
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return 'jpeg'
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if h.startswith(b'GIF'):
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return 'gif'
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return None
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