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Runtime error
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from collections import namedtuple
CustomField = namedtuple("CustomField", "fields removals")
# Versions of the loaded libraries
versions = {
'avcodec': 0,
'avformat': 0,
'avutil': 0,
'swresample': 0,
'swscale': 0,
}
# Group codecs by version they are usually packaged with.
release_versions = [
{'avcodec': 58, 'avformat': 58, 'avutil': 56, 'swresample': 3, 'swscale': 5},
{'libavcodec': 59, 'avformat': 59, 'avutil': 57, 'swresample': 4, 'swscale': 6}
]
# Removals done per library and version.
_version_changes = {
'avcodec': {},
'avformat': {},
'avutil': {},
'swresample': {},
'swscale': {}
}
def set_version(library, version):
versions[library] = version
def add_version_changes(library, version, structure, fields, removals):
if version not in _version_changes[library]:
_version_changes[library][version] = {}
if structure in _version_changes[library][version]:
raise Exception("Structure: {} from: {} has already been added for version {}.".format(structure,
library,
version)
)
_version_changes[library][version][structure] = CustomField(fields, removals)
def apply_version_changes():
"""Apply version changes to Structures in FFmpeg libraries.
Field data can vary from version to version, however assigning _fields_ automatically assigns memory.
_fields_ can also not be re-assigned. Use a temporary list that can be manipulated before setting the
_fields_ of the Structure."""
for library, data in _version_changes.items():
for version in data:
for structure, cf_data in _version_changes[library][version].items():
if versions[library] == version:
if cf_data.removals:
for remove_field in cf_data.removals:
for field in list(cf_data.fields):
if field[0] == remove_field:
cf_data.fields.remove(field)
structure._fields_ = cf_data.fields
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