138 lines
4.3 KiB
Plaintext
138 lines
4.3 KiB
Plaintext
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module ft8_decode
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type :: ft8_decoder
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procedure(ft8_decode_callback), pointer :: callback
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contains
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procedure :: decode
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end type ft8_decoder
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abstract interface
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subroutine ft8_decode_callback (this,sync,snr,dt,freq,decoded,nap,qual)
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import ft8_decoder
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implicit none
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class(ft8_decoder), intent(inout) :: this
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real, intent(in) :: sync
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integer, intent(in) :: snr
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real, intent(in) :: dt
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real, intent(in) :: freq
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character(len=22), intent(in) :: decoded
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integer, intent(in) :: nap
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real, intent(in) :: qual
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end subroutine ft8_decode_callback
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end interface
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contains
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subroutine decode(this,callback,iwave,nQSOProgress,nfqso,nftx,newdat, &
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nutc,nfa,nfb,nexp_decode,ndepth,nagain,lapon,napwid,mycall12, &
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mygrid6,hiscall12,hisgrid6)
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! use wavhdr
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use timer_module, only: timer
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include 'fsk4hf/ft8_params.f90'
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! type(hdr) h
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class(ft8_decoder), intent(inout) :: this
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procedure(ft8_decode_callback) :: callback
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real s(NH1,NHSYM)
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real candidate(3,200)
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real dd(15*12000)
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logical, intent(in) :: lapon,nagain
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logical newdat,lsubtract,ldupe,bcontest
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character*12 mycall12, hiscall12
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character*6 mygrid6,hisgrid6
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integer*2 iwave(15*12000)
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integer apsym(KK)
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character datetime*13,message*22
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character*22 allmessages(100)
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integer allsnrs(100)
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save s,dd
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bcontest=iand(nexp_decode,128).ne.0
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this%callback => callback
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write(datetime,1001) nutc !### TEMPORARY ###
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1001 format("000000_",i6.6)
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call ft8apset(mycall12,mygrid6,hiscall12,hisgrid6,bcontest,apsym,iaptype)
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dd=iwave
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ndecodes=0
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allmessages=' '
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allsnrs=0
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ifa=nfa
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ifb=nfb
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if(nagain) then
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ifa=nfqso-10
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ifb=nfqso+10
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endif
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! For now:
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! ndepth=1: no subtraction, 1 pass, belief propagation only
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! ndepth=2: subtraction, 2 passes, belief propagation only
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! ndepth=3: subtraction, 2 passes, bp+osd
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if(ndepth.eq.1) npass=1
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if(ndepth.ge.2) npass=3
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do ipass=1,npass
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newdat=.true. ! Is this a problem? I hijacked newdat.
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syncmin=1.5
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if(ipass.eq.1) then
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lsubtract=.true.
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if(ndepth.eq.1) lsubtract=.false.
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elseif(ipass.eq.2) then
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n2=ndecodes
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if(ndecodes.eq.0) cycle
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lsubtract=.true.
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elseif(ipass.eq.3) then
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if((ndecodes-n2).eq.0) cycle
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lsubtract=.false.
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endif
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call timer('sync8 ',0)
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call sync8(dd,ifa,ifb,syncmin,nfqso,s,candidate,ncand)
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call timer('sync8 ',1)
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do icand=1,ncand
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sync=candidate(3,icand)
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f1=candidate(1,icand)
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xdt=candidate(2,icand)
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nsnr0=min(99,nint(10.0*log10(sync) - 25.5)) !### empirical ###
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call timer('ft8b ',0)
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call ft8b(dd,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,napwid, &
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lsubtract,nagain,iaptype,mygrid6,bcontest,sync,f1,xdt,apsym, &
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nharderrors,dmin,nbadcrc,iappass,iera,message,xsnr)
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nsnr=nint(xsnr)
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xdt=xdt-0.5
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hd=nharderrors+dmin
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call timer('ft8b ',1)
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if(nbadcrc.eq.0) then
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! call jtmsg(message,iflag)
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if(bcontest) call fix_contest_msg(mygrid6,message)
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! if(iand(iflag,31).ne.0) message(22:22)='?'
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ldupe=.false.
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do id=1,ndecodes
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if(message.eq.allmessages(id).and.nsnr.le.allsnrs(id)) ldupe=.true.
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enddo
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if(.not.ldupe) then
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ndecodes=ndecodes+1
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allmessages(ndecodes)=message
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allsnrs(ndecodes)=nsnr
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endif
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! write(81,1004) nutc,ncand,icand,ipass,iaptype,iappass, &
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! nharderrors,dmin,hd,min(sync,999.0),nint(xsnr), &
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! xdt,nint(f1),message
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!1004 format(i6.6,2i4,3i2,i3,3f6.1,i4,f6.2,i5,2x,a22)
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! flush(81)
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if(.not.ldupe .and. associated(this%callback)) then
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qual=1.0-(nharderrors+dmin)/60.0 ! scale qual to [0.0,1.0]
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call this%callback(sync,nsnr,xdt,f1,message,iaptype,qual)
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endif
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endif
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enddo
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! h=default_header(12000,NMAX)
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! open(10,file='subtract.wav',status='unknown',access='stream')
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! iwave=nint(dd)
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! write(10) h,iwave
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! close(10)
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enddo
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return
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end subroutine decode
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end module ft8_decode
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