Mixer(3pm)						User Contributed Perl Documentation						Mixer(3pm)

NAME

       Audio::Mixer - Perl extension for Sound Mixer control

SYNOPSIS

	 use Audio::Mixer;
	 $volume = Audio::Mixer::get_cval('vol');
	 if (Audio::Mixer::set_cval('vol', 50, 40)) {
	   die("Can't set volume...");
	 }

DESCRIPTION

       Library to query / set various sound mixer parameters.

       This is just a very simple Perl interface which allows to set various sound mixer parameters. The most important probably 'vol' (volume).
       The list of all mixer parameters can be obtained using get_mixer_params() function.

       All values (lcval, rcval) are numbers in 0-100 range.

FUNCTIONS

       get_cval(cntrl) - Get parameter value Parameters:
	   cntrl - name of parameter Returns:
	   in array context: (lcval, rcval), where:
	     lcval - left channel value
	     rcval - right channel value
	   in scalar context returns value of get_param_val() (see below)

       set_cval(cntrl, lcval, rcval) - Set parameter value Parameters:
	   cntrl - name of parameter
	   lcval - left channel value
	   rcval - right channel value (optional, if not supplied
	     will be equal to lcval) Returns: 0 if Ok, -1 if failed

       set_source(cntrl) - set record source Parameters:
	   cntrl - name of channel to record from Returns: 0 if Ok, -1 if failed

       get_source(cntrl) - get record source Returns:
	   name of channel to record from

       set_mixer_dev(fname) - Set mixer device name (optional),
	   /dev/mixer is used by default
	   fname - device name Returns: 0 if Ok

       init_mixer() - Initialize mixer (open it)
	   set_cval() / get_cval() opens / closes the mixer each
	   time they called unless init_mixer() called before.
	   In case if init_mixer() called before all other
	   functions will use already opened device instead of
	   opening it each time.

       close_mixer() - Close device.
	   Should be called only if init_mixer() was used.

       get_mixer_params() - Get list of mixer parameters Returns: list of parameters names.

       LOW LEVEL FUNCTIONS:

       get_param_val(cntrl) - Get parameter value Parameter:
	   cntrl - name of parameter Returns:
	   integer value, which will be constructed as follows:
	     lower byte (x & 0xff) - value of the left channel
	       (or whole value)
	     next byte	(x & 0xff00) - value of the right channel
	     third byte (x & 0xff0000) - flags (if x & 0x10000 then	  2 channels exist)
	   or -1 in case of failure.

       set_param_val(cntrl, lcval, rcval) - Set parameter value.
	   Here all parameters are mandatory (in contrast to set_cval()).  Parameters:
	   cntrl - name of parameter
	   lcval - left channel value
	   rcval - right channel value Returns: 0 if Ok, -1 if failed

AUTHOR

       Sergey Gribov, sergey@sergey.com

LICENSE

       Copyright (c) 2001 Sergey Gribov. All rights reserved.  This program is free software; you can redistribute it and/or modify it under the
       same terms as Perl itself.

SEE ALSO

       perl(1).

perl v5.14.2							    2003-03-27								Mixer(3pm)