Python DPX validator
This script validates a set of header fields in a DPX file.
Install with setuptools:
python setup.py install
Validation errors are printed to standard error stream.
Or import from dpx_validator.api module:
This software is tested with Python 2.7 with Centos 7.x releases.
For more information about DPX, see the SMPTE standard ST 268-1:2014: File Format for Digital Moving-Picture Exchange (DPX)
These fields from specification are validated:
- Field 1
- Magic number of 'SDPX' or 'XPDS' for reversed byte order.
- Field 2
- A valid image data offset value.
- Field 3
- Header format version as either 'V1.0' or 'V2.0'
- Field 4
- DPX file size in header matches what filesystem shows.
- Field 15
- Encryption key is undefined and therefore image is unencrypted.
Format characters define form into which binary data is read from a header field.
Validation procedures in
dpx_validator.validations can return a single
informational message and must raise InvalidField exception when value in a
field is invalid. Validator will continue to the next validation procedure.
Each validation procedure output and error should contain final outcome of
the procedure, that is, a procedure should not finish with partial info or
errors from the procedure. Complex validation procedures for a single field
in header should store intermediate results until finishing the procedure or
be splitted to multiple procedures.
Return value from a validation procedure is not required. Exception must be
raised for a invalid value. New procedures are added to
dpx_validator.api.VALIDATED_FIELDS list in ascending
Copyright (C) 2018 CSC - IT Center for Science Ltd.
This program 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 3 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.