alsa-lib.rar_ALSA 框架_alsa_alsa lib

# 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_s