WSJT-X/lib/ft8_decode.f90

131 lines
4.1 KiB
Fortran
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module ft8_decode
type :: ft8_decoder
procedure(ft8_decode_callback), pointer :: callback
contains
procedure :: decode
end type ft8_decoder
abstract interface
subroutine ft8_decode_callback (this,sync,snr,dt,freq,iap,iera,decoded)
import ft8_decoder
implicit none
class(ft8_decoder), intent(inout) :: this
real, intent(in) :: sync
integer, intent(in) :: snr
real, intent(in) :: dt
real, intent(in) :: freq
integer, intent(in) :: iap
integer, intent(in) :: iera
character(len=22), intent(in) :: decoded
end subroutine ft8_decode_callback
end interface
contains
subroutine decode(this,callback,iwave,nfqso,newdat,nutc,nfa, &
nfb,nagain,ndepth,nsubmode,mycall12,hiscall12,hisgrid6)
! use wavhdr
use timer_module, only: timer
include 'fsk4hf/ft8_params.f90'
! type(hdr) h
class(ft8_decoder), intent(inout) :: this
procedure(ft8_decode_callback) :: callback
real s(NH1,NHSYM)
real candidate(3,200)
real dd(15*12000)
logical, intent(in) :: nagain
logical newdat,lsubtract,ldupe
character*12 mycall12, hiscall12
character*6 hisgrid6
integer*2 iwave(15*12000)
integer apsym(KK)
character datetime*13,message*22
character*22 allmessages(100)
integer allsnrs(100)
save s,dd
this%callback => callback
write(datetime,1001) nutc !### TEMPORARY ###
1001 format("000000_",i6.6)
call ft8apset(mycall12,hiscall12,hisgrid6,apsym,iaptype)
dd=iwave
ndecodes=0
allmessages=' '
allsnrs=0
! For now:
! ndepth=1: no subtraction, 1 pass, belief propagation only
! ndepth=2: subtraction, 2 passes, belief propagation only
! ndepth=3: subtraction, 2 passes, bp+osd2 at and near nfqso
if(ndepth.eq.1) npass=1
if(ndepth.ge.2) npass=2
do ipass=1,npass
newdat=.true. ! Is this a problem? I hijacked newdat.
if(ipass.eq.1) then
lsubtract=.true.
if(ndepth.eq.1) lsubtract=.false.
syncmin=1.5
else
lsubtract=.false.
syncmin=1.5
endif
call timer('sync8 ',0)
call sync8(dd,nfa,nfb,syncmin,nfqso,s,candidate,ncand)
call timer('sync8 ',1)
do icand=1,ncand
sync=candidate(3,icand)
f1=candidate(1,icand)
xdt=candidate(2,icand)
nsnr0=min(99,nint(10.0*log10(sync) - 25.5)) !### empirical ###
call timer('ft8b ',0)
call ft8b(dd,newdat,nfqso,ndepth,lsubtract,iaptype,icand,sync,f1, &
xdt,apsym,nharderrors,dmin,nbadcrc,iap,ipass,iera,message,xsnr)
nsnr=nint(xsnr)
xdt=xdt-0.5
hd=nharderrors+dmin
call timer('ft8b ',1)
if(nbadcrc.eq.0) then
call jtmsg(message,iflag)
if(iand(iflag,16).ne.0) message(22:22)='?'
if(iand(iflag,15).eq.0) then
ldupe=.false.
do id=1,ndecodes
if(message.eq.allmessages(id).and.nsnr.le.allsnrs(id)) ldupe=.true.
enddo
if(.not.ldupe) then
ndecodes=ndecodes+1
allmessages(ndecodes)=message
allsnrs(ndecodes)=nsnr
endif
! write(81,1004) nutc,ncand,icand,ipass,iaptype,iap,iera, &
! iflag,nharderrors,dmin,hd,min(sync,999.0),nint(xsnr), &
! xdt,nint(f1),message
! flush(81)
if(.not.ldupe .and. associated(this%callback)) then
call this%callback(sync,nsnr,xdt,f1,iap,iera,message)
endif
else
write(19,1004) nutc,ncand,icand,ipass,iaptype,iap,iera, &
iflag,nharderrors,dmin,hd,min(sync,999.0),nint(xsnr), &
xdt,nint(f1),message
1004 format(i6.6,2i4,4i2,2i3,3f6.1,i4,f6.2,i5,2x,a22)
flush(19)
endif
endif
enddo
! h=default_header(12000,NMAX)
! open(10,file='subtract.wav',status='unknown',access='stream')
! iwave=nint(dd)
! write(10) h,iwave
! close(10)
enddo
return
end subroutine decode
end module ft8_decode