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@jpstroop

jpstroop/jp2_dims.py

Created Jun 26, 2016
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#!/usr/bin/env python3
from io import open
from collections import deque
IHDR = b'\x69\x68\x64\x72' # See I.5.3.1 Image Header box
with open('tests/fixtures/images/color.jp2', 'rb') as jp2:
window = deque([], 4)
while bytes(b''.join(window)) != IHDR:
window.append(jp2.read(1))
# The image header box is the only place in the spec where height comes
# first. Go figure.
image_height = int.from_bytes(jp2.read(4), byteorder='big', signed=False)
image_width = int.from_bytes(jp2.read(4), byteorder='big', signed=False)
print(image_width, image_height)
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