SND_CARD_CREATE(9) Management of Cards and Device SND_CARD_CREATE(9)NAME
snd_card_create - create and initialize a soundcard structure
SYNOPSIS
int snd_card_create(int idx, const char * xid, struct module * module, int extra_size, struct snd_card ** card_ret);
ARGUMENTS
idx
card index (address) [0 ... (SNDRV_CARDS-1)]
xid
card identification (ASCII string)
module
top level module for locking
extra_size
allocate this extra size after the main soundcard structure
card_ret
the pointer to store the created card instance
DESCRIPTION
Creates and initializes a soundcard structure.
The function allocates snd_card instance via kzalloc with the given space for the driver to use freely. The allocated struct is stored in
the given card_ret pointer.
RETURN
Zero if successful or a negative error code.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SND_CARD_CREATE(9)
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ALSACTL(1) General Commands Manual ALSACTL(1)NAME
alsactl - advanced controls for ALSA soundcard driver
SYNOPSIS
alsactl [options] [store|restore|init] <card # or id or device>
DESCRIPTION
alsactl is used to control advanced settings for the ALSA soundcard drivers. It supports multiple soundcards. If your card has features
that you can't seem to control from a mixer application, you have come to the right place.
COMMANDS
store saves the current driver state for the selected soundcard to the configuration file.
restore loads driver state for the selected soundcard from the configuration file. If restoring fails (eventually partly), the init action
is called.
init tries to initialize all devices to a default state. If device is not known, error code 99 is returned.
If no soundcards are specified, setup for all cards will be saved or loaded.
OPTIONS -h, --help
Help: show available flags and commands.
-d, --debug
Use debug mode: a bit more verbose.
-v, --version
Print alsactl version number.
-f, --file
Select the configuration file to use. The default is /etc/asound.state.
-F, --force
Used with restore command. Try to restore the matching control elements as much as possible. This option is set as default now.
-g, --ignore
Used with store and restore commands. Do not show 'No soundcards found' and do not set an error exit code when soundcards are not
installed.
-P, --pedantic
Used with restore command. Don't restore mismatching control elements. This option was the old default behavior.
-I, --no-init-fallback
Don't initialize cards if restore fails. Since version 1.0.18, alsactl tries to initialize the card with the restore operation as
default. But this can cause incompatibility with the older version. The caller may expect that the state won't be touched if no
state file exists. This option takes the restore behavior back to the older version by suppressing the initialization.
-r, --runstate
Save restore and init state to this file. The file will contain only errors. Errors are appended with the soundcard id to the end
of file.
-R, --remove
Remove runstate file at first.
-E, --env #=#
Set environment variable (useful for init action or you may override ALSA_CONFIG_PATH to read different or optimized configuration -
may be useful for "boot" scripts).
-i, --initfile #=#
The configuration file for init. By default, PREFIX/share/alsa/init/00main is used.
FILES
/etc/asound.state (or whatever file you specify with the -f flag) is used to store current settings for your soundcards. The settings
include all the usual soundcard mixer settings. More importantly, alsactl is capable of controlling other card-specific features that
mixer apps usually don't know about.
The configuration file is generated automatically by running alsactl store. Editing the configuration file by hand may be necessary for
some soundcard features (e.g. enabling/disabling automatic mic gain, digital output, joystick/game ports, some future MIDI routing options,
etc).
SEE ALSO amixer(1), alsamixer(1), aplay(1)BUGS
None known.
AUTHOR
alsactl is by Jaroslav Kysela <perex@perex.cz> and Abramo Bagnara <abramo@alsa-project.org>. This document is by Paul Winkler
<zarmzarm@erols.com>.
15 May 2001 ALSACTL(1)