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The IRMP core library is not prepared for threading or interleaved use
by multiple call sites for different data streams, internal state is
kept in global vars (MCU project heritage). Adjust the Python wrapper,
create one usable instance, and several more which fail to execute.
Fail late such that users see error messages.
The approach isn't pretty, but avoids segfaults when re-loaded sessions
assign multiple decoder instances, and raises user's awareness of the
"one instance" limitation by established means: "decoder error" bar, and
log messages, with a description to point out the cause.
This commit implements a dirty modification of a singleton. It's a pity
that Python appears to lack reliable destruction, hence the whole class
remains blocked even if the instance is released. Move all library use
into pd.py:decode() in the hope that Python's 'with' could help in a
future implementation. Prepare to either present a generic message that
is generated by pd.py, or pass on a text that originates in the Python
wrapper for the C library.
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Recent upstream IRMP core versions introduced a "release" flag in
addition to the "repeat" flag. Prepare the decoder to present these
flags when libraries should pass them in results.
The flags' being orthogonal slightly complicates the logic which
constructs annotation texts. Do provide text variants for all previously
supported zoom levels, yet try to keep the implementation as simple as
possible: Match list lengths for simplified folding. Always print the
flags field even if none of the flags is active (kind of was done before
this change as well, just not visible). This approach easily accepts
more flags as needed in future versions.
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Address Python and sigrok project coding style nits in the IRMP based
decoder for infrared signals. Re-add the attribution which was lost in a
previous copy and forgotten in the recent submission. Eliminate camel
case identifiers and adjust to the simplified Python binding API. Drop
remaining diagnostics from development and dead code (unused carrier
detection). Reword the boilerplate text to match other decoders. Avoid
Python f-strings since they are not portable. Prefer slightly less
cryptic variable names in the construction of annotation texts. Defer
the creation of the library instance until actual decoder use. Start
inspecting the input data at the very first samples in the input stream.
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Commit the decoder as it was provided by Rene Staffen. Which appears to
be a slightly modified version of one of the other IR decoders, though
the boilerplate doesn't say so.
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