[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [27406] branches/render25/release/scripts/ modules/blend_render_info.py: standalone python module for reading scene, start, end frames from the blendfile (without blender).
Campbell Barton
ideasman42 at gmail.com
Thu Mar 11 11:39:07 CET 2010
Revision: 27406
http://projects.blender.org/plugins/scmsvn/viewcvs.php?view=rev&root=bf-blender&revision=27406
Author: campbellbarton
Date: 2010-03-11 11:39:05 +0100 (Thu, 11 Mar 2010)
Log Message:
-----------
standalone python module for reading scene, start, end frames from the blendfile (without blender). from blender 2.4x, ported to python3, added gzip support.
Added Paths:
-----------
branches/render25/release/scripts/modules/blend_render_info.py
Added: branches/render25/release/scripts/modules/blend_render_info.py
===================================================================
--- branches/render25/release/scripts/modules/blend_render_info.py (rev 0)
+++ branches/render25/release/scripts/modules/blend_render_info.py 2010-03-11 10:39:05 UTC (rev 27406)
@@ -0,0 +1,94 @@
+#!/usr/bin/python
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
+# In Blender, selecting scenes in the databrowser (shift+f4) will tag for rendering.
+
+# This struct wont 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
+
+ file = open(path, 'rb')
+
+ head = file.read(7)
+
+ if head[0:2] == b'\x1f\x8b': # gzip magic
+ import gzip
+ file.close()
+ file = gzip.open(path, 'rb')
+ head = file.read(7)
+
+ if head != b'BLENDER':
+ print("not a blend file:", path)
+ file.close()
+ return []
+
+ is_64_bit = (file.read(1) == b'-')
+
+ # true for PPC, false for X86
+ is_big_endian = (file.read(1) == b'V')
+
+ # Now read the bhead chunk!!!
+ file.read(3) # skip the version
+
+ scenes = []
+
+ sizeof_bhead = 24 if is_64_bit else 20
+
+ while file.read(4) == b'REND':
+ sizeof_bhead_left = sizeof_bhead - 4
+
+ rend_length = struct.unpack('>i' if is_big_endian else '<i', file.read(4))[0]
+ sizeof_bhead_left -= 4
+
+ # We dont care about the rest of the bhead struct
+ file.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', file.read(8))
+
+ scene_name = file.read(24)
+
+ scene_name = scene_name[:scene_name.index(b'\0')]
+
+ scenes.append((start_frame, end_frame, str(scene_name, 'utf8')))
+
+ return scenes
+
+
+def main():
+ import sys
+ for arg in sys.argv[1:]:
+ if arg.lower().endswith('.blend'):
+ print(read_blend_rend_chunk(arg))
+
+if __name__ == '__main__':
+ main()
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