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Split the enable-lfe-remixing setting into two

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remixing-produce-lfe controls upmixing, and remixing-consume-lfe
controls downmixing. The motivation is that a user might want to
synthesize LFE while playing stereo audio on his/her 5.1 speakers,
but at the same time follow the industry recommendation to omit
the LFE channel when producting a stereo downmix (e.g. for headphones)
from 5.1 content. Or the other way round.

Fixes: #753.
This commit is contained in:
Alexander Patrakov 2019-12-10 06:50:59 +00:00 • committed by Georg Chini
parent b94dba9daf
commit 464828faf2
12 changed files with 101 additions and 26 deletions
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29
man/pulse-daemon.conf.5.xml.in
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@ -147,13 +147,28 @@ License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
</option>
<option>
<p><opt>enable-lfe-remixing=</opt> If disabled when upmixing or
downmixing ignore LFE channels. When this option is disabled the
output LFE channel will only get a signal when an input LFE
channel is available as well. If no input LFE channel is
available the output LFE channel will always be 0. If no output
LFE channel is available the signal on the input LFE channel
will be ignored. Defaults to <opt>no</opt>.</p>
<p><opt>enable-lfe-remixing=</opt> This is a way to set
<opt>remixing-produce-lfe</opt> and <opt>remixing-consume-lfe</opt>
to the same value at once. This option only exists for backward
compatibility and may be removed in a future version of PulseAudio.</p>
</option>
<option>
<p><opt>remixing-produce-lfe=</opt> If enabled, and the sink input
does not have the LFE channel, synthesize the output LFE channel
as a (lowpass-filtered, if <opt>lfe-crossover-freq</opt> is not 0)
average of all input channels. Also, when <opt>lfe-crossover-freq</opt>
is not 0, filter out low frequencies from other channels while
producing a synthetic LFE output. If disabled, the output LFE channel
will only get a signal when an input LFE channel is available as well.
Defaults to <opt>no</opt>.</p>
</option>
<option>
<p><opt>remixing-consume-lfe=</opt> If enabled, and the sink does not
have an LFE channel, redirect the input LFE channel (if any) to other
channels. If disabled, the input LFE channel will remain unused unless
the sink has the LFE channel as well. Defaults to <opt>no</opt>.</p>
</option>
<option>