Add utility methods to the library

Author: rambo

parse_test.py renamed to gpmf/extract.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python3
-import hachoir.metadata
 import hachoir.parser
 
-
 from hachoir.field import MissingField
 from hachoir.field.string_field import String
 
@@ -16,6 +14,17 @@ def get_raw_content(met):
     return stream.read(met.absolute_address, met.size)
 
 
+def get_gpmf_payloads_from_file(filepath):
+    """Get payloads from file, returns a tuple with the payloads iterator and the parser instance"""
+    parser = hachoir.parser.createParser(filepath)
+    return (get_payloads(find_gpmd_stbl_atom(parser)), parser)
+
+
+def get_gpmf_payloads(parser):
+    """Shorthand for finding the GPMF atom to be passed to get_payloads"""
+    return get_payloads(find_gpmd_stbl_atom(parser))
+
+
 def get_payloads(stbl):
     """Get payloads by chunk from stbl, with timing info"""
     # Locate needed subatoms