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authorEric Wong <normalperson@yhbt.net>2006-07-16 16:52:19 +0000
committerEric Wong <normalperson@yhbt.net>2006-07-16 16:52:19 +0000
commit8224e837ef60278a9a1140515d79650d9024757e (patch)
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parent3c8e88b053e901de804a7d38f709056444155161 (diff)
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audioOutput_alsa: add use_mmap, period_time, buffer_time options
ALSA support in libao supports configuring of these variables, and some hardware setups may benefit from having these things as tweakable. git-svn-id: https://svn.musicpd.org/mpd/trunk@4363 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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diff --git a/doc/mpd.conf.5 b/doc/mpd.conf.5
index 7ff364b8b..88c9a6d85 100644
--- a/doc/mpd.conf.5
+++ b/doc/mpd.conf.5
@@ -236,6 +236,26 @@ separate options. An example for oss: "dsp=/dev/dsp". An example for alsa09:
This specifies how many bytes to write to the audio device at once. Used only
by the ao output type. This parameter is to work around a bug in older
versions of libao on sound cards with very small buffers. The default is 1024.
+.SH OPTIONAL ALSA OUTPUT PARAMETERS
+.TP
+.B use_mmap <yes or no>
+Setting this allows you to use memory-mapped I/O. Certain hardware setups
+may benefit from this, but most do not.
+Most users do not need to set this.
+.TP
+.B buffer_time <time in microseconds>
+This sets the length of the hardware sample buffer in microseconds.
+Increasing it may help to reduce or eliminate skipping on certain setups.
+Most users do not need to change this.
+The default is 500000 microseconds (0.5 seconds).
+.TP
+.B period_time <time in microseconds>
+This sets the time between hardware sample transfers in microseconds.
+Increasing this can reduce CPU usage while lowering it can reduce underrun
+errors on bandwidth-limited devices. Some users have reported good results
+with this set to 50000, but not all devices support values this high.
+Most users do not need to change this.
+The default is 256000000 / sample_rate(kHz), or 5804us for CD-quality audio.
.SH REQUIRED SHOUT OUTPUT PARAMETERS
.TP
.B name <name>