Release/2.1.2 (ebu#522)

* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes ebu#490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.

* Up version to 2.1.2

ebu_tt_live/bindings/_ebuttdt.py

@@ -37,13 +37,6 @@ class _TimedeltaBindingMixin(object):
         'end': []
     }
 
-    @classmethod
-    def _int_or_none(cls, value):
-        try:
-            return int(value)
-        except TypeError:
-            return 0
-
     @classmethod
     def compatible_timebases(cls):
         return cls._compatible_timebases