module soundbrotch

  implicit none
  ! ---------------------------------------------------------
  type t_sample2i
    integer             :: left
    integer             :: right
  end type
  ! ---------------------------------------------------------
  contains
  ! ---------------------------------------------------------

  subroutine soundbrotch_version ()
    write(0, '(1X,A)') "--- this is soundbrotch version alpha 666"
  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
    integer, save              :: oldl=0, oldr=0

    coef = (3.141592654 * 2.0) / 44.1e3
    do idx=0, numbs
      left  = INT(32e3 * level * sin(coef*real(idx)*fra))
      left  = (left  + oldl) / 2
      right = INT(32e3 * level * sin(coef*real(idx)*frb))
      right = (right + oldr) / 2
      print *, left, right
      oldl  = left
      oldr  = right
    enddo
    ! add silence at the end of the burst
    left  = 0
    right = 0
    do idx=0, numbs/3
      left  = (left  + oldl) / 2
      right = (right + oldr) / 2
      print *, 0, 0
      oldl  = left
      oldr  = right
    enddo

  end subroutine
  ! ---------------------------------------------------------

end module