[pulseaudio-discuss] [PATCH] Disabled LFE remixing by default
tanuk at iki.fi
Tue May 24 16:41:18 UTC 2016
On Sat, 2016-05-21 at 22:37 +0500, Alexander E. Patrakov wrote:
> The current LFE crossover filter removes low frequencies from the
> channels and puts them into the LFE channel with the wrong amplitude.
> It is not known for sure what is the correct relative amplitude
> measurements are required with real hardware), and changing that
> introduce a new bug, "it clips the LFE channel".
> So just disable the feature by default until a better understanding
> emerges how it should work. This, essentially, returns the defaults
> to their state as of PulseAudio 6.0.
> Some more observations:
> - Most of available active analog speakers on the market do the
> necessary crossover filtering already, and HDMI receivers can be
> configured to do that, too, so a crossover filter in PulseAudio is
> harmful in these use cases.
> - The "laptop with a builtin subwoofer" use case requires manual
> configuration anyway because the default crossover frequency (120 Hz)
> wrong for laptop speakers.
> - Finally, Windows 10 with a built-in USB audio driver does not
> the LFE channel given a 5.1 card and a stereo audio stream by
> Hides: https://bugs.freedesktop.org/show_bug.cgi?id=95021
> Signed-off-by: Alexander E. Patrakov <patrakov at gmail.com>
> man/pulse-daemon.conf.5.xml.in | 4 ++--
> src/daemon/daemon-conf.c | 4 ++--
> src/daemon/daemon.conf.in | 4 ++--
> src/pulsecore/core.c | 4 ++--
> 4 files changed, 8 insertions(+), 8 deletions(-)
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