107 lines
3.4 KiB
HTML
107 lines
3.4 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<META name="keywords" content="SM, PLIB, OpenGL, sound, library, mixer, OSS, Baker, Steve, smMixer">
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<META name="description" content="The PLIB SM Library allows one to drive the mixer controls of most PC-style sound cards.">
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<TITLE>The SL Mixer Library.</TITLE>
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</HEAD>
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<BODY text="#B5A642" link="#8FFF8F" vlink="#18A515" alink="#20336B"
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bgcolor="#005000" background="../marble.png">
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<TABLE>
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<TR>
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<TD><IMG SRC="mixer.png" ALT="Imagine kitchen mixers here" width=247 height=247></TD>
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<TD>
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<H1>The SL Mixer Library.</H1>
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By Steve Baker
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</TD>
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</TR>
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</TABLE>
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<H2>Introduction.</H2>
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This library allows one to drive the mixer controls of
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most PC-style sound cards. It relies
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on <A HREF="http://www.4front-tech.com">the Open Sound
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System</A> drivers (formerly known as 'VoxWare')
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- which are generally a standard part of the Linux Kernel - and
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which is also available on some other UNIX platforms.
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<p>
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A port of SM to the Windows family of operating systems
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is currently underway.
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<p>
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SM does not work under SGI's IRIX.
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<H2>Using the Library.</H2>
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To use this library, you must '#include "sm.h"' and link to
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libsm.a or libsm.so.
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<H2>class smMixer.</H2>
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This library comprises a single class 'smMixer'.
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<p>
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Most programs will only ever create a single smMixer object.
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<p>
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Here are the member functions:
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<pre>
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class smMixer
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{
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public:
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smMixer () ;
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smMixer ( char *device ) ;
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~smMixer () ;
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int not_working () ;
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/* Volume/Treble/Bass controls are in integer percentages */
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void setTreble ( int treble ) ;
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void setBass ( int bass ) ;
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void setMasterVolume ( int volume ) ;
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void setSynthVolume ( int volume ) ;
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void setPCMVolume ( int volume ) ;
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void setSpeakerVolume( int volume ) ;
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void setLineVolume ( int volume ) ;
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void setMicVolume ( int volume ) ;
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void setCDVolume ( int volume ) ;
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void setMasterVolume ( int left, int right ) ;
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void setSynthVolume ( int left, int right ) ;
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void setPCMVolume ( int left, int right ) ;
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void setSpeakerVolume( int left, int right ) ;
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void setLineVolume ( int left, int right ) ;
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void setMicVolume ( int left, int right ) ;
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void setCDVolume ( int left, int right ) ;
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} ;
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</pre>
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Basically, each of the mixer devices can be driven with either
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mono or stereo volume controls, each volume is a expressed as an
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integer percentage of maximum.
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<p>
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By default, "/dev/mixer" is the device used by this class, but
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an alternative device may be accessed if it's name is passed
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into the constructor.
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<p>
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The 'not_working()' function returns TRUE if there is any kind of
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problem with the driver. Mostly it returns TRUE if your system isn't
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set up for audio.
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<p>
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The driver will not fail if you call it's member functions when
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'not_working()' returns TRUE - so programs written for audio
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should work OK even on Linux boxes with no audio support.
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<hr>
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<table>
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<tr>
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<td>
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<a href="http://validator.w3.org/check/referer"><img border="0" src="../valid-html40.png" alt="Valid HTML 4.0!" height="31" width="88"></a>
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<td>
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<ADDRESS>
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<A HREF="http://www.sjbaker.org">
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Steve J. Baker.</A>
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<<A HREF="mailto:sjbaker1@airmail.net">sjbaker1@airmail.net</A>>
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</ADDRESS>
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</table>
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</BODY>
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</HTML>
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