[Bf-extensions-cvs] SVN commit: /data/svn/bf-extensions [3459] trunk/py/scripts/tools/bi_farm/ blend_render_info.py: script to extract the render info from a blend files header -- copied from blender /trunk.

[Campbell Barton]

Revision: 3459
          http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-extensions&revision=3459
Author:   campbellbarton
Date:     2012-06-06 07:19:48 +0000 (Wed, 06 Jun 2012)
Log Message:
-----------
script to extract the render info from a blend files header -- copied from blender/trunk.

Added Paths:
-----------
    trunk/py/scripts/tools/bi_farm/blend_render_info.py

Added: trunk/py/scripts/tools/bi_farm/blend_render_info.py
===================================================================
--- trunk/py/scripts/tools/bi_farm/blend_render_info.py	                        (rev 0)
+++ trunk/py/scripts/tools/bi_farm/blend_render_info.py	2012-06-06 07:19:48 UTC (rev 3459)
@@ -0,0 +1,100 @@
+#!/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>
+
+# This module can get render info without running from inside blender.
+#
+# 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
+
+    blendfile = open(path, 'rb')
+
+    head = blendfile.read(7)
+
+    if head[0:2] == b'\x1f\x8b':  # gzip magic
+        import gzip
+        blendfile.close()
+        blendfile = gzip.open(path, '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))
+
+    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()


Property changes on: trunk/py/scripts/tools/bi_farm/blend_render_info.py
___________________________________________________________________
Added: svn:executable
   + *