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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-or-later
# This module can get render info without running from inside blender.
#
# This struct won't change according to Ton.
# Note that the size differs on 32/64bit
#
# typedef struct BHead {
# int code, len;
# void *old;
# int SDNAnr, nr;
# } BHead;
def read_blend_rend_chunk(path):
import struct
blendfile = open(path, "rb")
head = blendfile.read(7)
if head[0:2] == b'\x1f\x8b': # gzip magic
import gzip
blendfile.seek(0)
blendfile = gzip.open(blendfile, "rb")
head = blendfile.read(7)
if head != b'BLENDER':
print("not a blend file:", path)
blendfile.close()
return []
is_64_bit = (blendfile.read(1) == b'-')
# true for PPC, false for X86
is_big_endian = (blendfile.read(1) == b'V')
# Now read the bhead chunk!!!
blendfile.read(3) # skip the version
scenes = []
sizeof_bhead = 24 if is_64_bit else 20
while blendfile.read(4) == b'REND':
sizeof_bhead_left = sizeof_bhead - 4
struct.unpack('>i' if is_big_endian else '<i', blendfile.read(4))[0]
sizeof_bhead_left -= 4
# We don't care about the rest of the bhead struct
blendfile.read(sizeof_bhead_left)
# Now we want the scene name, start and end frame. this is 32bites long
start_frame, end_frame = struct.unpack('>2i' if is_big_endian else '<2i', blendfile.read(8))
scene_name = blendfile.read(64)
scene_name = scene_name[:scene_name.index(b'\0')]
try:
scene_name = str(scene_name, "utf8")
except TypeError:
pass
scenes.append((start_frame, end_frame, scene_name))
blendfile.close()
return scenes
def main():
import sys
for arg in sys.argv[1:]:
if arg.lower().endswith('.blend'):
for value in read_blend_rend_chunk(arg):
print("%d %d %s" % value)
if __name__ == '__main__':
main()
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