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For now, libsigrokdecode clients expect to receive a 1:1 number of
input samples to logic output samples, along with a logic output
samplerate equal to the PD's input sample rate
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This means that the samplerate for logic output channels is
implicitly determined by the input channel samplerate.
The motivation for this is that hard-coding a samplerate isn't
possible - but at the same time, it's also not possible to
determine the samplerate at the time the logic output channels
are initialized, as the samplerate can be set at runtime.
From my point of view, we would need one of two mechanisms to
make this work:
1) Allow creation of logic outputs at runtime via some
registration callback
or
2) Allow changing a logic output's samplerate after it has been
created, again requiring some kind of callback
To me, both currently are overkill because making the assumption
that samplerate_in = samplerate_out not only makes this problem
go away as it can easily be handled on the client side where
samplerate_in is already known, it also makes handling of the
logic data in the PDs easier.
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Only add items to 'outputs' if the respective PD actually has
OUTPUT_PYTHON support implemented as of right now.
Various decoders might get OUTPUT_PYTHON support later, but the
'outputs' field should reflect the current status.
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Move initialization code of protocol decoders from the constructor to a
new reset() helper method. The libsigrokdecode backend could run this
method several times to clear the decoder's internal state, before new
data from another acquisition gets fed to decode() calls.
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This is not really relevant for stacked PDs currently (they can be used
unmodified with either PDv2 or PDv3 low-level decoders), but it'll allow
us to drop PDv2 support completely.
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Remove the FSF postal address as it might change (it did in the past).
Reference the gnu.org website instead which is more stable.
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The previous **kwargs some PDs had is not actually ever used, so drop it.
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Use self.ss/self.es, or if there's a need to differentiate
them a bit more, use self.ss_<suffix>/self.es_<suffix> consistently.
Also, drop some unused variables.
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