NAME

       roar_vs_stream - Set up stream parameters for VS object

SYNOPSIS

       #include <roaraudio.h>

       int  roar_vs_stream(roar_vs_t  *  vss, const struct roar_audio_info * info, int dir, int *
       error);

DESCRIPTION

       This function asks a VS object opened by roar_vs_new_from_con(3) or roar_vs_new(3) to open
       the data connection using the audio parameters info and the stream direction dir.

       This  function  needs  to  be  called  before  data is read or written if one of the above
       functions is used to create the VS object.

       This function is also used to provide parameters for the file mode (which  is  started  by
       using  roar_vs_file(3) or roar_vs_file_simple(3)).  To play back a file this is not needed
       in a common case as the VS API tries to find correct parameters.  It is required  for  all
       other   stream   directions.  See  roar_vs_file(3)  and  roar_vs_file_simple(3)  for  more
       information.

       On failture this function can be called again with different parameters.

PARAMETERS

       vss    The VS object to be updated.

       info   This is a pointer  to  the  roar_audio_info  structure  storing  the  audio  format
              parameters.  The structure contains the following members: rate (sample rate), bits
              (bits per sample), channels (channels per frame) and codec.

       dir    This is the stream direction. Common  values  include  ROAR_DIR_PLAY  for  waveform
              playback,  ROAR_DIR_MONITOR  for  waveform monitoring, ROAR_DIR_RECORD for waveform
              recording.  For MIDI ROAR_DIR_MIDI_IN and ROAR_DIR_MIDI_OUT is used.

       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

        struct roar_audio_info info;
        int err;

        if ( roar_profile2info(&info, "isdn-eu") == -1 ) {
         // error handling.
        }

        if ( roar_vs_stream(vss, &info, ROAR_DIR_PLAY, &err) == -1 ) {
         // error handling.
        }

SEE ALSO

       roar_vs_file(3), roar_vs_file_simple(3), roarvs(7), libroar(7), RoarAudio(7).