Alsa Utilities
The ALSA Utilities package contains various utilities which are useful for controlling your sound card.
Short Descriptions
- aconnect: is a utility for connecting and disconnecting two existing ports in the ALSA sequencer system.
- alsaconf: is a configuration tool which tries to detect the sound cards on your system and write a suitable configuration file for ALSA. This program is incompatible with udev and hotplug.
- alsactl: is used to control advanced settings for the ALSA sound card drivers.
- alsamixer: is an ncurses-based mixer program for use with the ALSA sound card drivers.
- amidi: is used to read from and write to ALSA RawMIDI ports.
- amixer: allows command-line control of the mixers for the ALSA sound card drivers.
- aplay: is a command-line soundfile player for the ALSA sound card drivers.
- aplaymidi: is a command-line utility that plays the specified MIDI file(s) to one or more ALSA sequencer ports.
- arecord: is a command-line soundfile recorder for the ALSA sound card drivers.
- arecordmidi: is a command-line utility that records a standard MIDI file from one or more ALSA sequencer ports.
- aseqdump: is a command-line utility that prints the sequencer events it receives as text.
- aseqnet: is an ALSA sequencer client which sends and receives event packets over a network.
- iecset: is a small utility to set or dump the IEC958 (or so-called “S/PDIF”) status bits of the specified sound card via the ALSA control API.
- speaker-test: is a command-line speaker test tone generator for ALSA.
Contingut
aconnect
is a utility for connecting and disconnecting two existing ports in the ALSA sequencer system.
ja l'he utilitzat profusament per connectar clients ALSA
alsaconf
alsactl
is used to control advanced settings for the ALSA sound card drivers.
$ alsa --help
El fitxer de configuració està per defecte a: /var/lib/alsa/asound.state
$ cat /var/lib/alsa/asound.state
state.ICH6 {
control.1 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Master Playback Switch'
value true
}
control.2 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
...
store <card #> save current driver setup for one or each soundcards
to configuration file
restore <card #> load current driver setup for one or each soundcards
from configuration file
init <card #> initialize driver to a default state
names <card #> dump information about all the known present (sub-)devices
into configuration file (DEPRECATED)
$ sudo alsactl store 0
guarda la configuració del driver de la targeta #0 al fitxer /var/lib/alsa/asound.state
Per carregar la configuració del driver:
$ alsactl restore 0
alsamixer
is an ncurses-based mixer program for use with the ALSA sound card drivers.
$ alsamixer --help AlsaMixer v1.0.18 Usage: alsamixer [-h] [-c <card: 0...7>] [-D <mixer device>] [-g] [-s] [-V <view>] [-a <abst>] $ alsamixer
Apareix una interfície gràfica basada amb ncurses, i amb el cursor es pot canviar els valors.
amidi
$ amidi --help
Usage: amidi options
-h, --help this help
-V, --version print current version
-l, --list-devices list all hardware ports
-L, --list-rawmidis list all RawMIDI definitions
-p, --port=name select port by name
-s, --send=file send the contents of a (.syx) file
-r, --receive=file write received data into a file
-S, --send-hex="..." send hexadecimal bytes
-d, --dump print received data as hexadecimal bytes
-t, --timeout=seconds exits when no data has been received
for the specified duration
-a, --active-sensing don't ignore active sensing bytes
Està documentat a Amidi:_enviar_missatges_MIDI_des_de_la_shell, on s'aprèn a enviar missatges MIDI des de la línia de comandes. A més, s'explica què són els ports midi virtuals i se'n configura un per fer sonar el que envio a través de la línia de comandes al fluidsynth.
amixer
allows command-line control of the mixers for the ALSA sound card drivers.
$ amixer --help Usage: amixer <options> [command] Available options: -h,--help this help -c,--card N select the card -D,--device N select the device, default 'default' -d,--debug debug mode -n,--nocheck do not perform range checking -v,--version print version of this program -q,--quiet be quiet -i,--inactive show also inactive controls -a,--abstract L select abstraction level (none or basic) -s,--stdin Read and execute commands from stdin sequentially Available commands: scontrols show all mixer simple controls scontents show contents of all mixer simple controls (default command) sset sID P set contents for one mixer simple control sget sID get contents for one mixer simple control controls show all controls for given card contents show contents of all controls for given card cset cID P set control contents for one control cget cID get control contents for one control
TBD
aplay
is a command-line soundfile player for the ALSA sound card drivers. TBD
aplaymidi
is a command-line utility that plays the specified MIDI file(s) to one or more ALSA sequencer ports.
$ aplaymidi --help Usage: aplaymidi -p client:port[,...] [-d delay] midifile ... -h, --help this help -V, --version print current version -l, --list list all possible output ports -p, --port=client:port,... set port(s) to play to -d, --delay=seconds delay after song ends $ aplaymidi -l Port Client name Port name 14:0 Midi Through Midi Through Port-0 128:0 TiMidity TiMidity port 0 128:1 TiMidity TiMidity port 1 128:2 TiMidity TiMidity port 2 128:3 TiMidity TiMidity port 3
Fem sonar un MIDI:
$ aplaymidi -p128:0 /home/joan/midis/beatles-carrythatweight.mid
i efectivament sona.
arecord
is a command-line soundfile recorder for the ALSA sound card drivers.
TBD
arecordmidi
is a command-line utility that records a standard MIDI file from one or more ALSA sequencer ports.
TBD
aseqdump
is a command-line utility that prints the sequencer events it receives as text.
TBD
aseqnet
is an ALSA sequencer client which sends and receives event packets over a network.
TBD
iecset
is a small utility to set or dump the IEC958 (or so-called “S/PDIF”) status bits of the specified sound card via the ALSA control API.
TBD
speaker-test
is a command-line speaker test tone generator for ALSA.
$ speaker-test speaker-test 1.0.18 Playback device is default Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 192 to 2097152 Period size range from 64 to 699051 Using max buffer size 2097152 Periods = 4 was set period_size = 524288 was set buffer_size = 2097152 0 - Front Left Time per period = 10,978441 0 - Front Left
Se sent un soroll de fregit. Per fer un test dels dos canals (esquerra i dreta):
$ speaker-test -c2 -D plughw:UA25EX -twav
creat per Joan Quintana Compte, maig 2009
