module soundbrotch

  implicit none
  ! ---------------------------------------------------------
  type t_sample2i
    integer             :: left
    integer             :: right
  end type
  type t_sample2r
    real                :: left
    real                :: right
  end type
  ! ---------------------------------------------------------
  !      some private variables
  
  integer, private               :: samplerate    = 48000
  real, private                  :: diapason      = 440.0
contains
  ! ---------------------------------------------------------
  subroutine soundbrotch_version ()
    write(0, '(1X,A)') "--- this is soundbrotch version alpha 667"
    write(0, *) "--- samplerate", samplerate
    write(0, *) "--- diapason  ", diapason
  end subroutine
  ! ---------------------------------------------------------
  ! ---------------------------------------------------------
  !        premier essai, le prototype peut changer !

  subroutine sinw_burst2i (dst, numbs, fra, frb, level)
    integer, intent(in)        :: dst        ! output unit number
    integer, intent(in)        :: numbs      ! number of sample to be made
    real, intent(in)           :: fra, frb   ! left and right frequency
    real, intent(in)           :: level      ! amplitude in [0..1]

    integer                    :: idx, left, right
    real                       :: coef

    ! XXX temporary dirty hack
    if (dst .NE. 6) then
      STOP '   OUPS, NOT ON STDOUT!'
    endif

    coef = (3.141592654 * 2.0) / real(samplerate)
    do idx=0, numbs
      left  = INT(32e3 * level * sin(coef*real(idx)*fra))
      right = INT(32e3 * level * sin(coef*real(idx)*frb))
      call xper_spit_2i(left, right)
    enddo

  end subroutine
  ! ---------------------------------------------------------
  !        mmmm ?
  subroutine silence_burst2i(nbsmpl)
    integer, intent(in)     :: nbsmpl
    integer                 :: idx
    do idx=0, nbsmpl
      call xper_spit_2i(0, 0)
    enddo
  end subroutine
  ! ---------------------------------------------------------
  !        mmmm ?
  subroutine xper_spit_2i(lsmpl, rsmpl)
    integer, intent(in)     :: lsmpl, rsmpl
    integer, save           :: oldl, oldr
    integer                 :: tmpl, tmpr

    tmpl = (lsmpl + oldl) / 2
    tmpr = (rsmpl + oldr) / 2
    print *, tmpl, tmpr
    oldl = tmpl
    oldr = tmpr

  end subroutine
  ! ---------------------------------------------------------
  ! 
  function midi2freq(note)
    integer, intent(in)    :: note
    real                   :: midi2freq

    real                   :: freq

    freq = (DIAPASON/32.0) * (2.0 ** (real(note - 9) / 12.0));
    ! write(0, *) "> ", note, freq

    midi2freq = freq

  end function
end module