5.1 zvuk

Napravi fajl /etc/asound.conf i u njega stavi:

[code]
# vim:noet:ts=8:sw=2
# Updated 050916, notes {at} notes.for.sabi.co.UK

# Syntax described in these links:
#  http://ALSA-project.org/alsa-doc/alsa-lib/conf.html”
#  http://ALSA-project.org/alsa-doc/alsa-lib/confarg.html”
#  http://ALSA-project.org/alsa-doc/alsa-lib/conffunc.html
#  http://ALSA-project.org/alsa-doc/alsa-lib/confhooks.html

# In this file I use a style similar to the one I use for CSS style sheets.

# It may also help to read:
#  http://WWW.sabi.co.UK/Notes/linuxSoundALSA.html

# Also check carefully the contents of ‘/usr/share/alsa/alsa.conf’,
# especially for the one liners defining standard device names
# and attributes.

# The device names “default”, “dsp0”, “mixer0” have special meanings.

# Standard channel number assignments:

#  0 front left 1 front right,
#  2 rear left 3 rear right
#  4 center 5 lfe/subwoofer
#  6 side left 7 side right

########################################################################

# Direct access to the hardware PCM and mixer devices

pcm.card0 { type hw; card 0; }
ctl.card0 { type hw; card 0; }

########################################################################

# Read very carefully the ALSA PCM plugin page at:
#  http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html

# For the ‘asym’, ‘dsnoop’, ‘dmix’ plugins also read:
#  http://ALSA.OpenSrc.org/index.php?page=asym
#  http://ALSA.OpenSrc.org/index.php?page=dsnoop
#  http://ALSA.OpenSrc.org/index.php?page=DmixPlugin

########################################################################

# The top level shared pseudo device, with both PCM and CTL interfaces
# The ALSA default is “default”, but many programs like XMMS and ‘aoss’
# assume “dsp0” as default name for PCM and “mixer0” for CTL.

# Amazingly, XMMS has problems if one defines ‘pcm.dsp0’ to be
# ‘plug’ for ‘pcm.asym0’ and not directly as ‘asym’.

pcm.!default { type asym;
  capture.pcm “dsnoop0”;
  playback.pcm “dmix0”; }
ctl.!default { type hw; card 0; }

########################################################################

pcm.dsp0 { type asym;
  capture.pcm “dsnoop0”;
  playback.pcm “dmix0”; }
ctl.dsp0 { type hw; card 0; }
ctl.mixer0 { type hw; card 0; }

# Just trying: probably wrong.
pcm.digi0 { type iec958;
  slave.pcm “hw:0,2”; }
ctl.digi0 { type hw; card 0; }

########################################################################

# The two detailed card configurations are for generic 2 to 5.1 channel
# chipsets. It is assumed that both cards need software sharing, and can
# only natively handle 48000Hz.

# These assumptions are fairly typical of recent (2004) low end and
# on-motherboard cards and chipsets, and their configs are not really
# specific to either models.

########################################################################

# CARD 0 SW MIXING
# ################

pcm.asym0 { type asym;
  capture.pcm “dsnoop0”;
  playback.pcm “dmix0”; }

pcm.dsnoop0 { type dsnoop;
  ipc_key 13758;
  slave.pcm “hw:0,0”; }

# Buffering (period time defaults to 125000 usecs).

# Size of period, expressed either in usec or byte units:
#  period_time USECS
#  period_size BYTES

# Size of buffers, expressed either in period, usec, or byte units:
#  periods PERIODS
#  buffer_time USECS
#  buffer_size BYTES

# The ALSA docs have examples with ‘period_time’ set to 0,
# when ‘period_size’ and ‘buffer_size’ are used instead,
# but this can cause trouble in later releases of ALSA.

# For OSS compatibility, ‘period_size’ and ‘buffer_size’
# should be powers of 2. Also, many cards cannot accept
# a ‘period_size’ much greater than 4096, so 4096 is safe.
# On my VIA 8233A, any value for ‘period_time’ greater than
# 85333 usecs (precisely!) causes hiccups in sound output.
# Why? At 48kHz, 85333 usec are are just over 4096 bytes/channel.

pcm.dmix0 { type dmix;
  ipc_key 13759;

  slave.pcm “hw:0”;
  slave.channels 2;
  slave.rate 48000;

  slave.period_size 4096;
  slave.buffer_size 81920;

  slave.period_time 84000;
  slave.buffer_time 504000;

  bindings.0 0;
  bindings.1 1; }

pcm.dmix0-40 { type dmix;
  ipc_key 13761;

  slave.pcm “hw:0”;
  slave.channels 4;
  slave.rate 48000;

  slave.period_size 4096;
  slave.buffer_size 81920;

  slave.period_time 84000;
  slave.buffer_time 504000;

  bindings.0 0;
  bindings.1 1;
  bindings.2 2;
  bindings.3 3; }

pcm.dmix0-51 { type dmix;
  ipc_key 13761;

  slave.pcm “hw:0”;
  slave.channels 6;
  slave.rate 48000;

  slave.period_size 4096;
  slave.buffer_size 81920;

  slave.period_time 84000;
  slave.buffer_time 504000;

  bindings.0 0;
  bindings.1 1;
  bindings.2 2;
  bindings.3 3;
  bindings.4 4;
  bindings.5 5; }

########################################################################

# 4 CHANNEL AS 2 STEREO
# #####################

# Using one four channel card as two stereo cards.
#  http://ALSA.OpenSrc.org/index.php?page=.asoundrc

#################
# 1st card, front

pcm.card0-f { type route;

  slave.pcm “hw:0,0”;
  slave.channels 2;

  ttable.0.0 1.0;
  ttable.1.1 1.0; }

# Not quite right.
ctl.card0-f { type hw; card 0; }

################
# 1st card, rear

# Note that all (some?) USB sound device config do not define the
# ‘surroundXY’ style name, so substitute the equivalent ‘hw’ name.

pcm.card0-r { type route;
  slave.pcm “surround40:0”;
  slave.channels 4;

  ttable.0.2 1.0;
  ttable.1.3 1.0; }

# Not quite right
ctl.card0-r { type hw, card 0; }

######################################
# 1st card, sides (often on a 2nd DAC)

pcm.card0-s { type route;
  slave.pcm “surround71:0”;
  slave.channels 8;

  ttable.0.6 1.0;
  ttable.1.7 1.0; }

# Not quite right
ctl.card0-s { type hw, card 0; }

########################################################################

# STEREO TO 4 OR 5.1
# ##################

# Distribute 2 channel stereo to 4 or 5.1 surround channels
# ‘surround40’ and ‘surround51’ should be predefined.
#  http://ALSA.OpenSrc.org/index.php?page=FAQ028
#  http://ALSA.OpenSrc.org/index.php?page=SurroundSound

# ‘table.X.Y Z’ means add channel ‘X’ multiplied by ‘Z’ to ‘Y’.

# Probably does not support sharing, stack ‘dsnoop’ on top for that.

# Note that all (some?) USB sound device config do not define the
# ‘surroundXY’ style name, so substitute the equivalent ‘hw’ name.

##########
# 1st card

pcm.stereo0-40 { type route;

  slave.pcm “dmix0-40”;
  slave.channels 4;

  ttable.0.0 1.0;
  ttable.0.2 0.8;

  ttable.1.1 1.0;
  ttable.1.3 0.8; }

ctl.stereo0-40 { type hw; card 0; }

pcm.stereo0-51 { type route;

  slave.pcm “dmix0-51”;
  slave.channels 6;

  ttable.0.0 1.0;
  ttable.0.2 0.8;
  ttable.0.4 0.4;
  ttable.0.5 0.4;

  ttable.1.1 1.0;
  ttable.1.3 0.8;
  ttable.1.4 0.4;
  ttable.1.5 0.4; }

ctl.stereo0-51 { type hw; card 0; }

########################################################################;

# 2 CARDS AS 1
# ############

# Using multiple cards to simulate a single card is usually a bad idea
# because they have different latencies and multichannel sound can come
# out with quite a bit of skew. Some people however have a legitimate
# need for this.

# Using two cards as one four channel card.
#  http://ALSA.OpenSrc.org/index.php?page=TwoCardsAsOne

######################################
# 1st >= 2 channels, 2nd >= 2 channels

pcm.multi4 { type multi;

  # could be “dmix0”
  slaves.a.pcm “hw:0,0”;
  slaves.a.channels 2;

  # could be “dmix1”
  slaves.b.pcm “hw:1,0”;
  slaves.b.channels 2;

  bindings.0.slave a;
  bindings.0.channel 0;

  bindings.1.slave a;
  bindings.1.channel 1;

  bindings.2.slave b;
  bindings.2.channel 0;

  bindings.3.slave b;
  bindings.3.channel 1; }

ctl.multi4 { type hw; card 0; }

# Using two cards as one 5.1 channel card, the first has
# 2 channels and the second has 4 channels, and viceversa.
#  http://ALSA.OpenSrc.org/index.php?page=TwoCardsAsOne

######################################
# 1st >= 2 channels, 2nd >= 4 channels

pcm.multi51-24 { type multi;

  # could be “dmix0”
  slaves.a.pcm “hw:0,0”;
  slaves.a.channels 2;

  # could be “dmix1”
  slaves.b.pcm “surround40:1”;
  slaves.b.channels 4;

  bindings.0.slave a;
  bindings.0.channel 0;

  bindings.1.slave a;
  bindings.1.channel 1;

  bindings.2.slave b;
  bindings.2.channel 0;

  bindings.3.slave b;
  bindings.3.channel 1;

  # Center, physically rear left, 2nd card
  bindings.4.slave b;
  bindings.4.channel 2;

  # LFE/subwoofer, physically rear right, 2nd card
  bindings.5.slave b;
  bindings.5.channel 3; }
# Not quite right.
ctl.multi51-24 { type hw; card 0; }

######################################
# 1st >= 4 channels, 2nd >= 2 channels

pcm.multi51-42 { type multi;

  # could be “dmix0”
  slaves.a.pcm “surround40:0”;
  slaves.a.channels 4;

  # could be “dmix1”
  slaves.b.pcm “hw:1,0”;
  slaves.b.channels 2;

  bindings.0.slave a;
  bindings.0.channel 0;

  bindings.1.slave a;
  bindings.1.channel 1;

  bindings.2.slave a;
  bindings.2.channel 2;

  bindings.3.slave a;
  bindings.3.channel 3;

  # Center, physically front left, 2nd card
  bindings.4.slave b;
  bindings.4.channel 0;

  # LFE/subwoofer, physically front right, 2nd card
  bindings.5.slave b;
  bindings.5.channel 1; }
# Not quite right.
ctl.multi51-42 { type hw; card 0; }

########################################################################;

# STEREO TO 0 AND 1
# #################

# Duplicate 2 channel stereo to two 2 channel stereo cards, joined
# together as a single virtual 4 channel card.

pcm.stereo01 { type route;

  slave.pcm “multi4”;
  slave.channels 4;

  #  0 front left 1 front right,
  #  2 rear left 3 rear right

  # ttable..
  ttable.0.0 1.0;
  ttable.0.2 1.0;

  ttable.1.1 1.0;
  ttable.1.3 1.0; }

ctl.stereo01 { type hw; card 0; }

########################################################################

# SW VOLUME CONTROL
# #################

#pcm.name { type softvol;
#   slave STR;
#   control {
#     name STR;
#       [card INT;]
#       [iface STR;]
#       [index INT;]
#       [device INT;]
#       [subdevice INT;]
#       [count INT;]
#   }
# }

########################################################################

# FILE OUTPUT
# ###########

pcm.file0 { type file;
  file “/tmp/alsa.raw”;
  slave.pcm “dsp0”;
#[format “raw”;]
#[perm 0600;]
}
ctl.file0 { type hw; card 0; }
[/code]

Zatim resetuj alsa servis (ili resetuj racunar…)