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lfe-filter: Enable LFE filter in the resampler

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When enable-lfe-remixing is set, an LFE channel is present in the
resampler's destination channel map but not in the source channel map,
we insert a low-pass filter instead of just averaging the channels.
Other channels will get a high-pass filter.

In this patch, the crossover frequency is hardcoded to 120Hz (to be fixed
in later patches).

Note that in current state the LFE filter is
 - not very optimised
 - not rewind friendly (rewinding can cause audible artifacts)

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2015-03-24 10:29:13 +01:00
parent f3ebf6b667
commit 979f19a434
7 changed files with 266 additions and 6 deletions
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3
src/Makefile.am
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@ -911,6 +911,9 @@ lib_LTLIBRARIES += libpulsecore-@PA_MAJORMINOR@.la
# Pure core stuff
libpulsecore_@PA_MAJORMINOR@_la_SOURCES = \
pulsecore/filter/lfe-filter.c pulsecore/filter/lfe-filter.h \
pulsecore/filter/biquad.c pulsecore/filter/biquad.h \
pulsecore/filter/crossover.c pulsecore/filter/crossover.h \
pulsecore/asyncmsgq.c pulsecore/asyncmsgq.h \
pulsecore/asyncq.c pulsecore/asyncq.h \
pulsecore/auth-cookie.c pulsecore/auth-cookie.h \