register_sound_mixer(9) [centos man page]

REGISTER_SOUND_MIXER(9) 					   Sound Devices					   REGISTER_SOUND_MIXER(9)

NAME

       register_sound_mixer - register a mixer device

SYNOPSIS

       int register_sound_mixer(const struct file_operations * fops, int dev);

ARGUMENTS

       fops
	   File operations for the driver

       dev
	   Unit number to allocate

DESCRIPTION

       Allocate a mixer device. Unit is the number of the mixer requested. Pass -1 to request the next free mixer unit.

RETURN

       On success, the allocated number is returned. On failure, a negative error code is returned.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   REGISTER_SOUND_MIXER(9)

mixerctl(1)							   User Commands						       mixerctl(1)

NAME

       mixerctl - audio mixer control command line application

SYNOPSIS

       /usr/sbin/mixerctl [-a | -d dev] [-iv] [-e | -o]

DESCRIPTION

       Some audio devices support the audio mixer functionality. See mixer(7I) for a complete description of the audio mixer. The mixerctl command
       is used to control the mode of the audio mixer and to get information about the audio  mixer  and  the  audio  device.  See  audio(7I)  for
       details.

OPTIONS

       The following options are supported. If none are specified, option -i is assumed:

       -a	  The command applies to all audio devices.

       -d dev	  The dev argument specifies an alternate audio control device for the command to use.

       -e	  Enables  the audio mixer function if the audio device supports it. If supported, the audio mixer may be enabled at any time. The
		  command silently ignores the enable option if the audio mixer is already enabled.

       -i	  Prints the audio device type information for the device and indicates whether the audio device uses  the  audio  mixer.  If  the
		  device does use the audio mixer, this option displays the audio mixer's mode.

       -o	  Turns  off the audio mixer function if the audio device supports it. If supported, the audio mixer may be turned off if only one
		  process has the device opened with the O_RDWR flag, or, if two different processes have the device opened, one with the O_RDONLY
		  flag	and  the  other  with the O_WRONLY flag. (See open(2).) The command silently ignores the disable option if the audio mixer
		  function is already disabled.

       -v	  Verbose mode. Prints the audio_info_t structure for the device, along with the device type information. This option implies  the
		  -i option.

ENVIRONMENT VARIABLES

       AUDIODEV     If	the -d and -a options are not specified, the AUDIODEV environment variable is consulted. If set, AUDIODEV will contain the
		    full path name of the user's default audio device. The default audio device will be converted into a control device, and  then
		    used. If the AUDIODEV variable is not set, /dev/audioctl is used.

FILES

       /dev/audioctl

       /dev/sound/{0...n}ctl

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |SPARC, x86		   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWauda			   |
       +-----------------------------+-----------------------------+
       |Stability Level 	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       audioconvert(1), audioplay(1), audiorecord(1), open(2), attributes(5), usb_ac(7D), audio(7I), audio_support(7I), mixer(7I)

SunOS 5.11							    12 Mar 2001 						       mixerctl(1)