NAME

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

SYNOPSIS

       #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 * error);

DESCRIPTION

       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).

PARAMETERS

       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 amplitude.

              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 roar_vs_mute(3).

       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.

RETURN VALUE

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

EXAMPLES

       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.;

SEE ALSO

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