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Especially for short descriptions, it is annoying to have to type \brief for
every single API doc.
Drop all \brief and enable the AUTOBRIEF feature of doxygen, which always takes
the first sentence of an API doc as the brief description.
Change-Id: I11a8a821b065a128108641a2a63fb5a2b1916e87
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Change-Id: I8c3aa5ec100abacf93da1493aa134e42bf612206
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It's a pity that even with this patch we still are fare away from having
the whole API documented. However, at least we have a more solid
foundation. Updates not only extend the documentation, but also make
sure it is rendered properly in the doxygen HTML.
Change-Id: I1344bd1a6869fb00de7c1899a8db93bba9bafce3
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Add a separate, faster convolution decoding implementation for rates
up to N=4 and constraint lengths of K=5 and K=7, which covers the
most GSM code uses. The decoding algorithm exploits the symmetric
structure of the Viterbi add-compare-select (ACS) operation - commonly
known as the ACS butterfly. This shift-register optimization can be
found in the well-known text by Dave Forney.
Forney, G.D., "The Viterbi Algorithm," Proc. of the IEEE, March 1973.
Implementation is non-architecture specific and improves performance on
x86 as well as ARM processors. Existing API is unchanged with optimized
code being called internally for supported codes.
The original code was relicensed under GPLv2-or-later with permission
of copyright holder - Tom Tsou.
Change-Id: I74d355274b4176a7d924f91ef3c96912ce338fb2
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Doxygen generates quite a lot of warnings on libosmocore. Some of them
are obvious typos - this patch aims to fix such low-hanging fruit.
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Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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Note that this breaks the ABI and the low level API. But it shouldn't
break the high level API, nor the conv code definitions (because fields
default to 0, and for new fields '0' is the previous behavior)
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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This should have been done with 1dd7c84733b20ba776510369e9daba1a822c5b44
but somehow was missed and only applied to the 'finish' method and
not the 'scan' method.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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alloca.h is not available on FreeBSD, use the default autoconf
function to check for it, there is a complete list[1] of what to
do for using alloca but let us see how far we get with this test.
Include netinet/in.h for the IPv4 and IPv6 socket address. Check
for dlopen in libraries and use this instead of linking -dl.
[1] http://www.gnu.org/s/hello/manual/autoconf/Particular-Functions.html
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If the input value is '0' it should not really affect the error
since it's just an indecisive bit. We accept this either an internal
'0' (generated via puncture) or as an external '0' (generated via an
external puncturing scheme). A real received bit should never be '0',
it's always gonna be closer to 1 or the other value ...
(thanks to mad@auth.se on the ML for the idea)
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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Far from perfect but suits our need thus far.
The viterbi with softbit input is quite cpu-intensive. Since
most received bursts are often mostly error free, you could
use a less cpu intensive algorithm (Fano ?) and with hard bit
input. Then only switch to viterbi soft bit input if the channel
is bad enough to justify it.
Soft output is not implemented as its usefulness for the block
coding is limited.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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