Proposal: Dynamic Read filtering using dlopen/dclose #1016
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The aim of this PR is to implement a dynamic read filtering using a "dynamic C library". My idea is to make complex read filtering at runtime without having to creating a new set of filtered bam.
For now the code is just for discussion. Please don't bear with me :-)
To do / discuss:
configure
to enable/disabledlopen
(I don't know how to do this).samtools *
andbcftools mpileup
.Dynamic read filters are dynamic C object loaded at runtime. The interface is defined in
sam_dynreadfilter.h
in the structureSamDynReadFilter
.Briefly a filter named
myfilter
should implement 3 functions:myfilter_initialize
that is used to initialize the filtermyfilter_accept
a function returning1
if the current reads is acceptedmyfilter_dispose
releases the resources associated to this filterfor now I've implemented the dynamic filtering in
view
anddepth
(option-k
)Example
The source contains two examples
misc/libfilterexample1.c
: https://github.com/lindenb/samtools/blob/pl_filter_hook/misc/filterexample1.c accepts reads if they have a clipped element with a length greater or equals to the env variable${MIN_CIGAR_LEN}
.misc/libfilterexample2.c
: https://github.com/lindenb/samtools/blob/pl_filter_hook/misc/filterexample2.c accepts reads containing a EchoRI site