[pulseaudio-discuss] [PATCH 4/4] Added documentation for soxr resampling methods.
andrey.semashev at gmail.com
Thu Jan 8 06:51:30 PST 2015
man/pulse-daemon.conf.5.xml.in | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/man/pulse-daemon.conf.5.xml.in b/man/pulse-daemon.conf.5.xml.in
index 754312e..e1ee673 100644
@@ -88,7 +88,8 @@ USA.
- <opt>speex-fixed-N</opt>, <opt>ffmpeg</opt>. See the
+ <opt>speex-fixed-N</opt>, <opt>ffmpeg</opt>, <opt>soxr-mq</opt>,
+ <opt>soxr-hq</opt>, <opt>soxr-vhq</opt>. See the
documentation of libsamplerate and speex for explanations of the
different src- and speex- methods, respectively. The method
<opt>trivial</opt> is the most basic algorithm implemented. If
@@ -98,8 +99,15 @@ USA.
exist in two flavours: <opt>fixed</opt> and <opt>float</opt>. The former uses fixed point
numbers, the latter relies on floating point numbers. On most
desktop CPUs the float point resampler is a lot faster, and it
- also offers slightly better quality. See the output of
- <opt>dump-resample-methods</opt> for a complete list of all
+ also offers slightly better quality. The soxr- family methods
+ are based on libsoxr, a resampler library from SoX sound processing utility.
+ The mq variant has the best performance of the three. The hq is more expensive
+ and, according to SoX developers, is considered the best choice for audio of up to 16 bits per sample.
+ The vhq variant has more precision than hq and is more suitable for larger samples. The Soxr resamplers
+ generally offer better quality at less CPU compared to other resamplers, such as speex.
+ The downside is that it can add a significant delay to the output
+ (usually, up to around 20 ms, in rare cases more).
+ See the output of <opt>dump-resample-methods</opt> for a complete list of all
available resamplers. Defaults to <opt>speex-float-1</opt>. The
<opt>--resample-method</opt> command line option takes precedence.
Note that some modules overwrite or allow overwriting of the
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