doc/asoundrc.txt - manifest_repos/alsa-lib - Git at Google

 # Configuration file syntax

 # Include a new configuration file
 <filename>

 # Simple assign
 name [=] value [,|;]

 # Compound assign (first style)
 name [=] {
 	name1 [=] value [,|;]
 	...
 }

 # Compound assign (second style)
 name.name1 [=] value [,|;]

 # Array assign (first style)
 name [
 	value0 [,|;]
 	value1 [,|;]
 	...
 ]

 # Array assign (second style)
 name.0 [=] value0 [,|;]
 name.1 [=] value1 [,|;]

 # ******************************************************************************

 # Server definition
 server.NAME {
   host STR		# host where the server is located (if map to local address
 			# server is local, and then it may be started automatically)
   [socket STR]		# PF_LOCAL socket name to listen/connect
   [port INT]		# PF_INET port number to listen/connect
 }

 # PCM type definition
 pcm_type.NAME {
   [lib STR]		# Library file (default libasound.so)
   [open	STR]		# Open function (default _snd_pcm_NAME_open)
   [redirect {		# Redirect this PCM to an another
      [filename STR]	# Configuration file specification
      name STR		# PCM name specification
   }]
 }

 # PCM scope type definition
 pcm_scope_type.NAME {
   [lib STR]		# Library file (default libasound.so)
   [open STR]		# Open function (default _snd_pcm_scope_NAME_open)
 }

 # PCM scope definition
 pcm_scope.NAME {
   type STR		# Scope type
   ...
 }

 # Slave PCM definition
 pcm_slave.NAME {
   pcm STR		# PCM name
   # or
   pcm { }		# PCM definition
   format STR		# Format
   channels INT		# Channels
   rate INT		# Rate
   period_time INT	# Period time
   buffer_time INT	# Buffer time
   etc.
 }

 # Hook arguments definition
 hook_args.NAME {
   ...			# Arbitrary arguments
 }

 # PCM hook type
 pcm_hook_type.NAME {
   [lib STR]		# Library file (default libasound.so)
   [install STR]		# Install function (default _snd_pcm_hook_NAME_install)
 }

 # PCM hook definition
 pcm_hook.NAME {
   type STR		# PCM Hook type (see pcm_hook_type)
   [args STR]		# Arguments for install function (see hook_args)
   # or
   [args { }]		# Arguments for install function
 }

 # PCM definition
 pcm.NAME {
   type STR		# Type
   [comment ANY]		# Saved comments


 # PCM types:
   type hw 		# Kernel PCM
   card INT/STR		# Card name or number
   [device] INT		# Device number (default 0)
   [subdevice] INT	# Subdevice number, -1 first available (default -1)
   mmap_emulation BOOL	# enable mmap emulation for ro/wo devices


   type hooks 		# PCM with hooks
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
   }
   hooks {
     ID STR		# Hook name (see pcm_hook)
     # or
     ID { }		# Hook definition (see pcm_hook)
   }

   type plug		# Format adjusted PCM
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
     [format STR]	# Slave format (default nearest) or "unchanged"
     [channels INT]	# Slave channels (default nearest) or "unchanged"
     [rate INT]		# Slave rate (default nearest) or "unchanged"
   }
   route_policy STR	# route policy for automatic ttable generation
 			# STR can be 'default', 'average', 'copy', 'duplicate'
 			# average: result is average of input channels
 			# copy: only first channels are copied to destination
 			# duplicate: duplicate first set of channels
 			# default: copy policy, except for mono capture - sum
   ttable {	 	# Transfer table (bidimensional compound of
 	        	# cchannels * schannels numbers)
     CCHANNEL {
       SCHANNEL REAL	# route value (0.0 ... 1.0)
     }
   }


   type copy		# Copy conversion PCM
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
   }


   type linear		# Linear format conversion PCM
   type adpcm		# IMA-ADPCM format conversion PCM
   type alaw		# A-Law format conversion PCM
   type mulaw		# Mu-Law format conversion PCM
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
     format STR		# Slave format
   }


   type rate		# Rate conversion PCM
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
     [format STR]	# Slave format (default client format)
     rate INT		# Slave rate
   }


   type route		# Attenuated static route PCM
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
     [format STR]	# Slave format (default client format)
     [channels INT]	# Slave channels (default client channels)
   }
   ttable {	 	# Transfer table (bidimensional compound of
 	        	# cchannels * schannels numbers)
     CCHANNEL {
       SCHANNEL REAL	# route value (0.0 ... 1.0)
     }
   }


   type multi		# Linked PCMs (exclusive access to selected channels)
   slaves {		# Slaves definitions
     ID STR		# Slave name for slave N (see pcm_slave)
     # or
     ID {		# Slave definition for slave N
       pcm STR		# Slave PCM name
     # or
       pcm { }		# Slave PCM definition
       channels INT	# Slave channels
     }
   }
   bindings {		# Bindings table
     N {			# Binding for client channel N
       slave STR		# Slave key
       channel INT	# Slave channel
     }
   }
   [master INT]		# Define the master slave


   type file		# File plugin
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
   }
   file STR		# File name
   # or
   file INT		# File descriptor
   [format STR]		# File format (NYI)
   [perm INT]		# File permission (default 0600)

   type meter		# Meter PCM
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition or name
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
   }
   [frequency INT]	# Updates per second
   scopes {		# Scopes
     ID STR		# Scope name (see pcm_scope)
   # or
     ID { }		# Scope definition (see pcm_scope)
   }


   type droute		# Attenuated dynamic route PCM (NYI)
   slave STR		# Slave name (see pcm_slave)
   # or
   slave {		# Slave definition
     pcm STR		# Slave PCM name
     # or
     pcm { }		# Slave PCM definition
     [format STR]	# Slave format (default client format)
     [channels INT]	# Slave channels (default client channels)
   }
   ctl STR		# Ctl name
   bindings {		# Bindings table
     ID {		# Binding entry
       cchannels {	# Client channels
         C INT		# Client channel
       }
       schannel {	# Slave channels
         S INT		# Slave channel
       }
       control STR	# Control name of C * S (or C values: only if C == S)
     }
   }


   type null		# Null endpoint plugin
   [time INT]		# Time related or not (NYI)


   type shm		# Shared memory client PCM
   server STR		# Server name
   pcm STR		# PCM name on server


   type share		# Share PCM
   slave STR		# Slave name (see pcm_slave)
   bindings {		# Bindings table
     N INT		# Slave channel for client channel N
   }


   type mix		# Mix PCM
   slave STR		# Slave name (see pcm_slave)
   bindings {		# Bindings table
     N INT		# Slave channel for client channel N
   }


   type ladspa		# LADSPA plugin PCM
   slave STR		# Slave name (see pcm_slave)
   path STR		# Path or paths (delimited with ':')
   plugins | playback_plugins | capture_plugins {
     N {			# Configuration for LADSPA plugin N
       id #		# LADSPA plugin ID (for example 1043)
       label STR		# LADSPA plugin label (for example 'delay_5s')
       filename STR	# Full filename of .so library with LADPA plugin code
       policy STR	# Policy can be 'none' or 'duplicate'
       input | output {
         bindings {
           C INT or STR  # C - channel, INT - audio port index, STR - audio port name
         }
         controls {
           I INT or REAL # I - control port index, INT or REAL - control value
         }
       }
     }
   }

   type dmix		# Direct mixing plugin
   slave STR		# Slave name (see pcm_slave)
   ipc_key INT		# Unique ipc key
   ipc_perm INT		# ipc permissions (default 0600)
   ipc_gid INT		# ipc gid (default -1 = disable)
   ipc_key_add_uid BOOL  # Add current uid to ipc_key
   bindings {		# Bindings table
     N INT		# Slave channel for client channel N
   }

   type dsnoop		# Direct snoop (split one capture stream to more)
   slave STR		# Slave name (see pcm_slave)
   ipc_key INT		# Unique ipc key
   ipc_perm INT		# ipc permissions (default 0600)
   ipc_gid INT		# ipc gid (default -1 = disable)
   ipc_key_add_uid BOOL  # Add current uid to ipc_key
   bindings {		# Bindings table
     N INT		# Slave channel for client channel N
   }

   type dshare		# Share channels from one stream
   slave STR		# Slave name (see pcm_slave)
   ipc_key INT		# Unique ipc key
   ipc_perm INT		# ipc permissions (default 0600)
   ipc_gid INT		# ipc gid (default -1 = disable)
   ipc_key_add_uid BOOL  # Add current uid to ipc_key
   bindings {		# Bindings table
     N INT		# Slave channel for client channel N
   }
 }

 # CTL type definition
 ctl_type.NAME {
   [lib STR]		# Library file (default libasound.so)
   [open STR]		# Open function (default _snd_ctl_NAME_open)
 }

 # CTL definition
 ctl.NAME {
   type STR		# Type
   [comment ANY]		# Saved comments

 # CTL types
   type hw
   card STR/INT		# Card name or number


   type shm		# Shared memory client CTL
   server STR		# Server name
   ctl STR		# CTL name on server


 }


 # RAWMIDI type definition
 rawmidi_type.NAME {
   [lib STR]		# Library file (default libasound.so)
   [open STR]		# Open function (default _snd_rawmidi_NAME_open)
 }

 # RAWMIDI definition
 rawmidi.NAME {
   type STR		# Type
   [comment ANY]		# Saved comments

 # RAWMIDI types:
   type hw 		# Kernel RAWMIDI
   card INT/STR		# Card name or number
   [device] INT		# Device number (default 0)
   [subdevice] INT	# Subdevice number, -1 first available (default -1)


 }

 # SEQ type definition
 seq_type.NAME {
   [lib STR]		# Library file (default libasound.so)
   [open STR]		# Open function (default _snd_seq_NAME_open)
 }

 # SEQ definition
 seq.NAME {
   type STR		# Type
   [comment ANY]		# Saved comments

 # SEQ types:
   type hw 		# Kernel SEQ


 }

 # Aliases
 DEF.NAME1 NAME2		# DEF.NAME1 is an alias for DEF.NAME2

 Some examples:

 pcm.trident {
 	type hw
 	card 0
 	device 0
 }

 pcm.ice1712 {
 	type hw
 	card 1
 	device 0
 }

 pcm.ice1712_spdif {
 	type plug
 	ttable.0.8 1
 	ttable.1.9 1
 	slave.pcm ice1712
 }

 pcm_slave.rs {
 	pcm trident
 	rate 44100
 }

 pcm.r {
 	type rate
 	slave rs
 }

 pcm.m {
 	type meter
 	slave.pcm plug:trident
 	frequency 50
 	scopes [
 		{
 			type level
 		}
 	]
 }

 pcm_scope_type.level {
 	lib /home/abramo/scopes/scope-level.so
 }

 # an example command is 'aplay -D plug:ladspa <filename>'
 # otherwise, the ladspa plugin expects FLOAT type which
 # is very rare
 pcm.ladspa {
         type ladspa
         slave.pcm "plughw:0,0";
         path "/home/perex/src/ladspa_sdk/plugins";
         plugins [
                 {
                         label delay_5s
                         input {
                                 controls [ 0.8 0.2 ]
                         }
                 }
         ]
 }

 # an example command for dmix plugin to force 44100Hz mixing rate:
 # aplay -D"plug:'dmix:RATE=44100'" <filename>
 # an example command for dmix plugin to force 44100Hz and hw:1,0 output device
 # aplay -Dplug:\'dmix:SLAVE=\"hw:1,0\",RATE=44100\' <filename>
 # an example command for dmix plugin to force 32-bit signed little endian format
 # aplay -D"plug:'dmix:FORMAT=S32_LE'" <filename>
	# Configuration file syntax

	# Include a new configuration file
	<filename>

	# Simple assign
	name [=] value [,\|;]

	# Compound assign (first style)
	name [=] {
	name1 [=] value [,\|;]
	...
	}

	# Compound assign (second style)
	name.name1 [=] value [,\|;]

	# Array assign (first style)
	name [
	value0 [,\|;]
	value1 [,\|;]
	...
	]

	# Array assign (second style)
	name.0 [=] value0 [,\|;]
	name.1 [=] value1 [,\|;]

	# ******************************************************************************

	# Server definition
	server.NAME {
	host STR # host where the server is located (if map to local address
	# server is local, and then it may be started automatically)
	[socket STR] # PF_LOCAL socket name to listen/connect
	[port INT] # PF_INET port number to listen/connect
	}

	# PCM type definition
	pcm_type.NAME {
	[lib STR] # Library file (default libasound.so)
	[open STR] # Open function (default _snd_pcm_NAME_open)
	[redirect { # Redirect this PCM to an another
	[filename STR] # Configuration file specification
	name STR # PCM name specification
	}]
	}

	# PCM scope type definition
	pcm_scope_type.NAME {
	[lib STR] # Library file (default libasound.so)
	[open STR] # Open function (default _snd_pcm_scope_NAME_open)
	}

	# PCM scope definition
	pcm_scope.NAME {
	type STR # Scope type
	...
	}

	# Slave PCM definition
	pcm_slave.NAME {
	pcm STR # PCM name
	# or
	pcm { } # PCM definition
	format STR # Format
	channels INT # Channels
	rate INT # Rate
	period_time INT # Period time
	buffer_time INT # Buffer time
	etc.
	}

	# Hook arguments definition
	hook_args.NAME {
	... # Arbitrary arguments
	}

	# PCM hook type
	pcm_hook_type.NAME {
	[lib STR] # Library file (default libasound.so)
	[install STR] # Install function (default _snd_pcm_hook_NAME_install)
	}

	# PCM hook definition
	pcm_hook.NAME {
	type STR # PCM Hook type (see pcm_hook_type)
	[args STR] # Arguments for install function (see hook_args)
	# or
	[args { }] # Arguments for install function
	}

	# PCM definition
	pcm.NAME {
	type STR # Type
	[comment ANY] # Saved comments


	# PCM types:
	type hw # Kernel PCM
	card INT/STR # Card name or number
	[device] INT # Device number (default 0)
	[subdevice] INT # Subdevice number, -1 first available (default -1)
	mmap_emulation BOOL # enable mmap emulation for ro/wo devices


	type hooks # PCM with hooks
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	}
	hooks {
	ID STR # Hook name (see pcm_hook)
	# or
	ID { } # Hook definition (see pcm_hook)
	}

	type plug # Format adjusted PCM
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	[format STR] # Slave format (default nearest) or "unchanged"
	[channels INT] # Slave channels (default nearest) or "unchanged"
	[rate INT] # Slave rate (default nearest) or "unchanged"
	}
	route_policy STR # route policy for automatic ttable generation
	# STR can be 'default', 'average', 'copy', 'duplicate'
	# average: result is average of input channels
	# copy: only first channels are copied to destination
	# duplicate: duplicate first set of channels
	# default: copy policy, except for mono capture - sum
	ttable { # Transfer table (bidimensional compound of
	# cchannels * schannels numbers)
	CCHANNEL {
	SCHANNEL REAL # route value (0.0 ... 1.0)
	}
	}


	type copy # Copy conversion PCM
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	}


	type linear # Linear format conversion PCM
	type adpcm # IMA-ADPCM format conversion PCM
	type alaw # A-Law format conversion PCM
	type mulaw # Mu-Law format conversion PCM
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	format STR # Slave format
	}


	type rate # Rate conversion PCM
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	[format STR] # Slave format (default client format)
	rate INT # Slave rate
	}


	type route # Attenuated static route PCM
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	[format STR] # Slave format (default client format)
	[channels INT] # Slave channels (default client channels)
	}
	ttable { # Transfer table (bidimensional compound of
	# cchannels * schannels numbers)
	CCHANNEL {
	SCHANNEL REAL # route value (0.0 ... 1.0)
	}
	}


	type multi # Linked PCMs (exclusive access to selected channels)
	slaves { # Slaves definitions
	ID STR # Slave name for slave N (see pcm_slave)
	# or
	ID { # Slave definition for slave N
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	channels INT # Slave channels
	}
	}
	bindings { # Bindings table
	N { # Binding for client channel N
	slave STR # Slave key
	channel INT # Slave channel
	}
	}
	[master INT] # Define the master slave


	type file # File plugin
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	}
	file STR # File name
	# or
	file INT # File descriptor
	[format STR] # File format (NYI)
	[perm INT] # File permission (default 0600)

	type meter # Meter PCM
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition or name
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	}
	[frequency INT] # Updates per second
	scopes { # Scopes
	ID STR # Scope name (see pcm_scope)
	# or
	ID { } # Scope definition (see pcm_scope)
	}


	type droute # Attenuated dynamic route PCM (NYI)
	slave STR # Slave name (see pcm_slave)
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	[format STR] # Slave format (default client format)
	[channels INT] # Slave channels (default client channels)
	}
	ctl STR # Ctl name
	bindings { # Bindings table
	ID { # Binding entry
	cchannels { # Client channels
	C INT # Client channel
	}
	schannel { # Slave channels
	S INT # Slave channel
	}
	control STR # Control name of C * S (or C values: only if C == S)
	}
	}


	type null # Null endpoint plugin
	[time INT] # Time related or not (NYI)


	type shm # Shared memory client PCM
	server STR # Server name
	pcm STR # PCM name on server


	type share # Share PCM
	slave STR # Slave name (see pcm_slave)
	bindings { # Bindings table
	N INT # Slave channel for client channel N
	}


	type mix # Mix PCM
	slave STR # Slave name (see pcm_slave)
	bindings { # Bindings table
	N INT # Slave channel for client channel N
	}


	type ladspa # LADSPA plugin PCM
	slave STR # Slave name (see pcm_slave)
	path STR # Path or paths (delimited with ':')
	plugins \| playback_plugins \| capture_plugins {
	N { # Configuration for LADSPA plugin N
	id # # LADSPA plugin ID (for example 1043)
	label STR # LADSPA plugin label (for example 'delay_5s')
	filename STR # Full filename of .so library with LADPA plugin code
	policy STR # Policy can be 'none' or 'duplicate'
	input \| output {
	bindings {
	C INT or STR # C - channel, INT - audio port index, STR - audio port name
	}
	controls {
	I INT or REAL # I - control port index, INT or REAL - control value
	}
	}
	}
	}

	type dmix # Direct mixing plugin
	slave STR # Slave name (see pcm_slave)
	ipc_key INT # Unique ipc key
	ipc_perm INT # ipc permissions (default 0600)
	ipc_gid INT # ipc gid (default -1 = disable)
	ipc_key_add_uid BOOL # Add current uid to ipc_key
	bindings { # Bindings table
	N INT # Slave channel for client channel N
	}

	type dsnoop # Direct snoop (split one capture stream to more)
	slave STR # Slave name (see pcm_slave)
	ipc_key INT # Unique ipc key
	ipc_perm INT # ipc permissions (default 0600)
	ipc_gid INT # ipc gid (default -1 = disable)
	ipc_key_add_uid BOOL # Add current uid to ipc_key
	bindings { # Bindings table
	N INT # Slave channel for client channel N
	}

	type dshare # Share channels from one stream
	slave STR # Slave name (see pcm_slave)
	ipc_key INT # Unique ipc key
	ipc_perm INT # ipc permissions (default 0600)
	ipc_gid INT # ipc gid (default -1 = disable)
	ipc_key_add_uid BOOL # Add current uid to ipc_key
	bindings { # Bindings table
	N INT # Slave channel for client channel N
	}
	}

	# CTL type definition
	ctl_type.NAME {
	[lib STR] # Library file (default libasound.so)
	[open STR] # Open function (default _snd_ctl_NAME_open)
	}

	# CTL definition
	ctl.NAME {
	type STR # Type
	[comment ANY] # Saved comments

	# CTL types
	type hw
	card STR/INT # Card name or number


	type shm # Shared memory client CTL
	server STR # Server name
	ctl STR # CTL name on server


	}


	# RAWMIDI type definition
	rawmidi_type.NAME {
	[lib STR] # Library file (default libasound.so)
	[open STR] # Open function (default _snd_rawmidi_NAME_open)
	}

	# RAWMIDI definition
	rawmidi.NAME {
	type STR # Type
	[comment ANY] # Saved comments

	# RAWMIDI types:
	type hw # Kernel RAWMIDI
	card INT/STR # Card name or number
	[device] INT # Device number (default 0)
	[subdevice] INT # Subdevice number, -1 first available (default -1)


	}

	# SEQ type definition
	seq_type.NAME {
	[lib STR] # Library file (default libasound.so)
	[open STR] # Open function (default _snd_seq_NAME_open)
	}

	# SEQ definition
	seq.NAME {
	type STR # Type
	[comment ANY] # Saved comments

	# SEQ types:
	type hw # Kernel SEQ


	}

	# Aliases
	DEF.NAME1 NAME2 # DEF.NAME1 is an alias for DEF.NAME2

	Some examples:

	pcm.trident {
	type hw
	card 0
	device 0
	}

	pcm.ice1712 {
	type hw
	card 1
	device 0
	}

	pcm.ice1712_spdif {
	type plug
	ttable.0.8 1
	ttable.1.9 1
	slave.pcm ice1712
	}

	pcm_slave.rs {
	pcm trident
	rate 44100
	}

	pcm.r {
	type rate
	slave rs
	}

	pcm.m {
	type meter
	slave.pcm plug:trident
	frequency 50
	scopes [
	{
	type level
	}
	]
	}

	pcm_scope_type.level {
	lib /home/abramo/scopes/scope-level.so
	}

	# an example command is 'aplay -D plug:ladspa <filename>'
	# otherwise, the ladspa plugin expects FLOAT type which
	# is very rare
	pcm.ladspa {
	type ladspa
	slave.pcm "plughw:0,0";
	path "/home/perex/src/ladspa_sdk/plugins";
	plugins [
	{
	label delay_5s
	input {
	controls [ 0.8 0.2 ]
	}
	}
	]
	}

	# an example command for dmix plugin to force 44100Hz mixing rate:
	# aplay -D"plug:'dmix:RATE=44100'" <filename>
	# an example command for dmix plugin to force 44100Hz and hw:1,0 output device
	# aplay -Dplug:\'dmix:SLAVE=\"hw:1,0\",RATE=44100\' <filename>
	# an example command for dmix plugin to force 32-bit signed little endian format
	# aplay -D"plug:'dmix:FORMAT=S32_LE'" <filename>