libavfilter/dnn: add header into native model file

Signed-off-by: Guo, Yejun <yejun.guo@intel.com>
Signed-off-by: Pedro Arthur <bygrandao@gmail.com>

tools/python/convert_from_tensorflow.py

@@ -20,6 +20,7 @@
 import tensorflow as tf
 import numpy as np
 import sys, struct
+import convert_header as header
 
 __all__ = ['convert_from_tensorflow']
 
@@ -229,6 +230,8 @@ class TFConverter:
 
     def dump_to_file(self):
         with open(self.outfile, 'wb') as f:
+            f.write(header.str.encode('utf-8'))
+            np.array([header.major, header.minor], dtype=np.uint32).tofile(f)
             self.dump_layers_to_file(f)
             self.dump_operands_to_file(f)
             np.array([self.layer_number, len(self.name_operand_dict)], dtype=np.uint32).tofile(f)

tools/python/convert_header.py

@@ -0,0 +1,26 @@
+# Copyright (c) 2019
+#
+# This file is part of FFmpeg.
+#
+# FFmpeg is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# FFmpeg 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with FFmpeg; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+# ==============================================================================
+
+str = 'FFMPEGDNNNATIVE'
+
+# increase major and reset minor when we have to re-convert the model file
+major = 0
+
+# increase minor when we don't have to re-convert the model file
+minor = 1