[PATCH 4/4] core/conv: Add optimized Viterbi decoding

[Vadim Yanitskiy]

Hi Tom and all,

After a quick look at the 4th patch, related to your optimized
Viterbi decoder, I have noticed that currently the convolutional
code definitions from the 'src/gsm/gsm0503_conv.c' are out of
the 'tests/conv' test coverage...

So, I would like to extend the test coverage. All I need are
the test vectors, which I'll add to existing ones. Some of them
I already found in your 4th patch, but some pending I need to
write myself.

Right now I have a simple question...
Let's look at one example:

{
    .name = "GSM RACH (non-recursive, flushed, not punctured)",
    .code = &gsm_conv_rach,
    .in_len  = 14,
    .out_len = 36, // ???
    .has_vec = 0,
    .vec_in  = { },
    .vec_out = { },
}

As I noticed, the 'in_len' may be taken from the code definition:

const struct osmo_conv_code gsm0503_rach = {
    .N = 2,
    .K = 5,
    .len = 14, // The 'in_len' is here!
    .next_output = xcch_output,
    .next_state = xcch_state,
};

But I don't know how to calculate the 'out_len'...
Could you please give me some hint?

I already started to work on your 4th patch:
https://gerrit.osmocom.org/1542
https://gerrit.osmocom.org/1543

With best regards,
Vadim Yanitskiy.
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