Provided by: libroar-dev_0.4-2_i386 bug


       roar_vs_volume_get, roar_vs_volume_mono, roar_vs_volume_stereo - Get or
       set volume for audio stream


       #include <roaraudio.h>

       int     roar_vs_volume_get    (roar_vs_t * vss, float * l, float  *  r,
       int * error);

       int     roar_vs_volume_mono   (roar_vs_t * vss, float c, int * error);

       int     roar_vs_volume_stereo (roar_vs_t * vss, float l, float r, int *


       Those functions are used to get or set volume for the given stream.

       roar_vs_volume_get() gets the volume for the  given  stream  in  stereo
       form as a left and a right component (L/R). If you need the mono volume
       just devide the sum of both by two. See examples below.

       roar_vs_volume_mono() sets the mono  volume  for  the  stream.  Balance
       information is not kept.

       roar_vs_volume_stereo()  sets  the stereo volume for the stream as left
       and rigth component (L/R).


       vss    The VS object for wich volume is get or set.

       l, r, c
              The volume for left, right or center (mono) channel. Value is  a
              float  in  range  zero to one.  Zero means this channel is fully
              muted. One means the channel  is  passed  without  altering  the

              Small numerical errors are detected and corrected. Bigger errors
              will result in a out of range error.

              Note that to mute the stream you MUST NOT use volume setting but

       error  This  is a pointer to a integer used to store the error value in
              case of error.  This can be NULL if not  used  but  it  is  very
              recommended  to  use  this  error  value  to  report  good error
              messages to the user.


       On success these calls return 0.  On error, -1 is returned.


       Getting mono volume:

        float l, r, c;
        int err;

        if ( roar_vs_volume_get(vss, &l, &r, &err) == -1 ) {
         /* handle error */
        c = (l + r)/2.;


       roarvs(7), libroar(7), RoarAudio(7).