mirror of
https://github.com/alsa-project/alsa-lib.git
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480 lines
11 KiB
Text
480 lines
11 KiB
Text
# Configuration file syntax
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# Include a new configuration file
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<filename>
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# Simple assign
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name [=] value [,|;]
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# Compound assign (first style)
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name [=] {
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name1 [=] value [,|;]
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...
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}
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# Compound assign (second style)
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name.name1 [=] value [,|;]
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# Array assign (first style)
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name [
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value0 [,|;]
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value1 [,|;]
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...
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]
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# Array assign (second style)
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name.0 [=] value0 [,|;]
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name.1 [=] value1 [,|;]
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# ******************************************************************************
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# Server definition
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server.NAME {
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host STR # host where the server is located (if map to local address
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# server is local, and then it may be started automatically)
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[socket STR] # PF_LOCAL socket name to listen/connect
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[port INT] # PF_INET port number to listen/connect
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}
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# PCM type definition
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pcm_type.NAME {
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[lib STR] # Library file (default libasound.so)
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[open STR] # Open function (default _snd_pcm_NAME_open)
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[redirect { # Redirect this PCM to an another
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[filename STR] # Configuration file specification
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name STR # PCM name specification
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}]
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}
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# PCM scope type definition
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pcm_scope_type.NAME {
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[lib STR] # Library file (default libasound.so)
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[open STR] # Open function (default _snd_pcm_scope_NAME_open)
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}
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# PCM scope definition
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pcm_scope.NAME {
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type STR # Scope type
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...
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}
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# Slave PCM definition
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pcm_slave.NAME {
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pcm STR # PCM name
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# or
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pcm { } # PCM definition
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format STR # Format
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channels INT # Channels
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rate INT # Rate
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period_time INT # Period time
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buffer_time INT # Buffer time
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etc.
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}
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# Hook arguments definition
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hook_args.NAME {
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... # Arbitrary arguments
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}
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# PCM hook type
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pcm_hook_type.NAME {
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[lib STR] # Library file (default libasound.so)
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[install STR] # Install function (default _snd_pcm_hook_NAME_install)
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}
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# PCM hook definition
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pcm_hook.NAME {
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type STR # PCM Hook type (see pcm_hook_type)
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[args STR] # Arguments for install function (see hook_args)
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# or
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[args { }] # Arguments for install function
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}
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# PCM definition
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pcm.NAME {
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type STR # Type
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[comment ANY] # Saved comments
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# PCM types:
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type hw # Kernel PCM
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card INT/STR # Card name or number
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[device] INT # Device number (default 0)
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[subdevice] INT # Subdevice number, -1 first available (default -1)
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mmap_emulation BOOL # enable mmap emulation for ro/wo devices
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type hooks # PCM with hooks
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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}
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hooks {
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ID STR # Hook name (see pcm_hook)
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# or
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ID { } # Hook definition (see pcm_hook)
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}
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type plug # Format adjusted PCM
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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[format STR] # Slave format (default nearest) or "unchanged"
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[channels INT] # Slave channels (default nearest) or "unchanged"
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[rate INT] # Slave rate (default nearest) or "unchanged"
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}
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route_policy STR # route policy for automatic ttable generation
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# STR can be 'default', 'average', 'copy', 'duplicate'
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# average: result is average of input channels
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# copy: only first channels are copied to destination
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# duplicate: duplicate first set of channels
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# default: copy policy, except for mono capture - sum
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ttable { # Transfer table (bidimensional compound of
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# cchannels * schannels numbers)
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CCHANNEL {
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SCHANNEL REAL # route value (0.0 ... 1.0)
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}
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}
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type copy # Copy conversion PCM
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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}
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type linear # Linear format conversion PCM
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type adpcm # IMA-ADPCM format conversion PCM
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type alaw # A-Law format conversion PCM
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type mulaw # Mu-Law format conversion PCM
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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format STR # Slave format
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}
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type rate # Rate conversion PCM
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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[format STR] # Slave format (default client format)
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rate INT # Slave rate
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}
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type route # Attenuated static route PCM
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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[format STR] # Slave format (default client format)
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[channels INT] # Slave channels (default client channels)
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}
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ttable { # Transfer table (bidimensional compound of
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# cchannels * schannels numbers)
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CCHANNEL {
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SCHANNEL REAL # route value (0.0 ... 1.0)
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}
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}
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type multi # Linked PCMs (exclusive access to selected channels)
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slaves { # Slaves definitions
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ID STR # Slave name for slave N (see pcm_slave)
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# or
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ID { # Slave definition for slave N
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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channels INT # Slave channels
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}
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}
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bindings { # Bindings table
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N { # Binding for client channel N
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slave STR # Slave key
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channel INT # Slave channel
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}
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}
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[master INT] # Define the master slave
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type file # File plugin
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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}
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file STR # File name
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# or
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file INT # File descriptor
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[format STR] # File format (NYI)
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[perm INT] # File permission (default 0600)
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type meter # Meter PCM
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition or name
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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}
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[frequency INT] # Updates per second
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scopes { # Scopes
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ID STR # Scope name (see pcm_scope)
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# or
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ID { } # Scope definition (see pcm_scope)
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}
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type droute # Attenuated dynamic route PCM (NYI)
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slave STR # Slave name (see pcm_slave)
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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[format STR] # Slave format (default client format)
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[channels INT] # Slave channels (default client channels)
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}
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ctl STR # Ctl name
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bindings { # Bindings table
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ID { # Binding entry
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cchannels { # Client channels
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C INT # Client channel
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}
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schannel { # Slave channels
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S INT # Slave channel
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}
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control STR # Control name of C * S (or C values: only if C == S)
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}
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}
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type null # Null endpoint plugin
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[time INT] # Time related or not (NYI)
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type shm # Shared memory client PCM
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server STR # Server name
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pcm STR # PCM name on server
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type share # Share PCM
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slave STR # Slave name (see pcm_slave)
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bindings { # Bindings table
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N INT # Slave channel for client channel N
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}
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type mix # Mix PCM
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slave STR # Slave name (see pcm_slave)
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bindings { # Bindings table
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N INT # Slave channel for client channel N
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}
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type ladspa # LADSPA plugin PCM
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slave STR # Slave name (see pcm_slave)
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path STR # Path or paths (delimited with ':')
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plugins | playback_plugins | capture_plugins {
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N { # Configuration for LADSPA plugin N
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id # # LADSPA plugin ID (for example 1043)
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label STR # LADSPA plugin label (for example 'delay_5s')
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filename STR # Full filename of .so library with LADPA plugin code
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policy STR # Policy can be 'none' or 'duplicate'
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input | output {
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bindings {
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C INT or STR # C - channel, INT - audio port index, STR - audio port name
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}
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controls {
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I INT or REAL # I - control port index, INT or REAL - control value
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}
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}
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}
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}
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type dmix # Direct mixing plugin
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slave STR # Slave name (see pcm_slave)
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ipc_key INT # Unique ipc key
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ipc_perm INT # ipc permissions (default 0600)
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ipc_gid INT # ipc gid (default -1 = disable)
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ipc_key_add_uid BOOL # Add current uid to ipc_key
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bindings { # Bindings table
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N INT # Slave channel for client channel N
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}
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type dsnoop # Direct snoop (split one capture stream to more)
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slave STR # Slave name (see pcm_slave)
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ipc_key INT # Unique ipc key
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ipc_perm INT # ipc permissions (default 0600)
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ipc_gid INT # ipc gid (default -1 = disable)
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ipc_key_add_uid BOOL # Add current uid to ipc_key
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bindings { # Bindings table
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N INT # Slave channel for client channel N
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}
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type dshare # Share channels from one stream
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slave STR # Slave name (see pcm_slave)
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ipc_key INT # Unique ipc key
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ipc_perm INT # ipc permissions (default 0600)
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ipc_gid INT # ipc gid (default -1 = disable)
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ipc_key_add_uid BOOL # Add current uid to ipc_key
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bindings { # Bindings table
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N INT # Slave channel for client channel N
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}
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}
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# CTL type definition
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ctl_type.NAME {
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[lib STR] # Library file (default libasound.so)
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[open STR] # Open function (default _snd_ctl_NAME_open)
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}
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# CTL definition
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ctl.NAME {
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type STR # Type
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[comment ANY] # Saved comments
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# CTL types
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type hw
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card STR/INT # Card name or number
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type shm # Shared memory client CTL
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server STR # Server name
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ctl STR # CTL name on server
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}
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# RAWMIDI type definition
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rawmidi_type.NAME {
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[lib STR] # Library file (default libasound.so)
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[open STR] # Open function (default _snd_rawmidi_NAME_open)
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}
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# RAWMIDI definition
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rawmidi.NAME {
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type STR # Type
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[comment ANY] # Saved comments
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# RAWMIDI types:
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type hw # Kernel RAWMIDI
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card INT/STR # Card name or number
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[device] INT # Device number (default 0)
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[subdevice] INT # Subdevice number, -1 first available (default -1)
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}
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# SEQ type definition
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seq_type.NAME {
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[lib STR] # Library file (default libasound.so)
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[open STR] # Open function (default _snd_seq_NAME_open)
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}
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# SEQ definition
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seq.NAME {
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type STR # Type
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[comment ANY] # Saved comments
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# SEQ types:
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type hw # Kernel SEQ
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}
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# Aliases
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DEF.NAME1 NAME2 # DEF.NAME1 is an alias for DEF.NAME2
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Some examples:
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pcm.trident {
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type hw
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card 0
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device 0
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}
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pcm.ice1712 {
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type hw
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card 1
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device 0
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}
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pcm.ice1712_spdif {
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type plug
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ttable.0.8 1
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ttable.1.9 1
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slave.pcm ice1712
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}
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pcm_slave.rs {
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pcm trident
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rate 44100
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}
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pcm.r {
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type rate
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slave rs
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}
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pcm.m {
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type meter
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slave.pcm plug:trident
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frequency 50
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scopes [
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{
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type level
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}
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]
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}
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pcm_scope_type.level {
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lib /home/abramo/scopes/scope-level.so
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}
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# an example command is 'aplay -D plug:ladspa <filename>'
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# otherwise, the ladspa plugin expects FLOAT type which
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# is very rare
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pcm.ladspa {
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type ladspa
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slave.pcm "plughw:0,0";
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path "/home/perex/src/ladspa_sdk/plugins";
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plugins [
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{
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label delay_5s
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input {
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controls [ 0.8 0.2 ]
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}
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}
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]
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}
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# an example command for dmix plugin to force 44100Hz mixing rate:
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# aplay -D"plug:'dmix:RATE=44100'" <filename>
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# an example command for dmix plugin to force 44100Hz and hw:1,0 output device
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# aplay -Dplug:\'dmix:SLAVE=\"hw:1,0\",RATE=44100\' <filename>
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# an example command for dmix plugin to force 32-bit signed little endian format
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# aplay -D"plug:'dmix:FORMAT=S32_LE'" <filename>
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