leansdr::rs_decoder< Tbyte, BYTE_ERASED > Struct Template Reference

#include <dvb.h>

Inheritance diagram for leansdr::rs_decoder< Tbyte, BYTE_ERASED >:

Collaboration diagram for leansdr::rs_decoder< Tbyte, BYTE_ERASED >:

Public Member Functions
	rs_decoder (scheduler *sch, pipebuf< rspacket< Tbyte >> &_in, pipebuf< tspacket > &_out, pipebuf< int > *_bitcount=NULL, pipebuf< int > *_errcount=NULL)
void	run ()
Public Member Functions inherited from leansdr::runnable
	runnable (scheduler *_sch, const char *name)
Public Member Functions inherited from leansdr::runnable_common
	runnable_common (const char *_name)
virtual	~runnable_common ()
virtual void	shutdown ()

Public Attributes
rs_engine	rs
Public Attributes inherited from leansdr::runnable_common
const char *	name

Private Attributes
pipereader< rspacket< Tbyte > >	in
pipewriter< tspacket >	out
pipewriter< int > *	bitcount
pipewriter< int > *	errcount

Additional Inherited Members
Protected Attributes inherited from leansdr::runnable
scheduler *	sch

Detailed Description

template<typename Tbyte, int BYTE_ERASED>
struct leansdr::rs_decoder< Tbyte, BYTE_ERASED >

Definition at line 1215 of file dvb.h.

Constructor & Destructor Documentation

rs_decoder()

template<typename Tbyte, int BYTE_ERASED>

leansdr::rs_decoder< Tbyte, BYTE_ERASED >::rs_decoder ( scheduler *  sch, pipebuf< rspacket< Tbyte >> &  _in, pipebuf< tspacket > &  _out, pipebuf< int > *  _bitcount = NULL, pipebuf< int > *  _errcount = NULL  )

inline

Definition at line 1219 of file dvb.h.

                                               : runnable(sch, "RS decoder"),
                                                 in(_in),
                                                 out(_out)
    {
        bitcount = _bitcount ? new pipewriter<int>(*_bitcount) : NULL;
        errcount = _errcount ? new pipewriter<int>(*_errcount) : NULL;
    }

Member Function Documentation

run()

template<typename Tbyte, int BYTE_ERASED>

void leansdr::rs_decoder< Tbyte, BYTE_ERASED >::run ( )

inlinevirtual

Reimplemented from leansdr::runnable_common.

Definition at line 1231 of file dvb.h.

    {
        if (bitcount && bitcount->writable() < 1)
            return;
        if (errcount && errcount->writable() < 1)
            return;

        int nbits = 0, nerrs = 0;

        while (in.readable() >= 1 && out.writable() >= 1)
        {
            Tbyte *pin = in.rd()->data;
            u8 *pout = out.wr()->data;

            nbits += SIZE_RSPACKET * 8;

            // The message is the first 188 bytes.
            if (sizeof(Tbyte) == 1)
                memcpy(pout, pin, SIZE_TSPACKET);
            else
                fail("Erasures not implemented");

            u8 synd[16];
            bool corrupted = rs.syndromes(pin, synd);

#if 0
            if ( ! corrupted ) {
                // Test BM
                fprintf(stderr, "Simulating errors\n");
                pin[203] ^= 42;
                pin[202] ^= 99;
                corrupted = rs.syndromes(pin, synd);
            }
#endif
            if (!corrupted)
            {
                if (sch->debug)
                    fprintf(stderr, "_"); // Packet received without errors.
            }
            else
            {
                corrupted = rs.correct(synd, pout, pin, &nerrs);

                if (sch->debug)
                {
                    if (!corrupted)
                        fprintf(stderr, "."); // Errors were corrected.
                    else
                        fprintf(stderr, "!"); // Packet still corrupted.
                }
            }

            in.read(1);

            // Output corrupted packets (with a special mark)
            // otherwise the derandomizer will lose synchronization.
            if (corrupted)
                pout[0] ^= MPEG_SYNC_CORRUPTED;

            out.written(1);
        }

        if (nbits)
        {
            if (bitcount)
                bitcount->write(nbits);
            if (errcount)
                errcount->write(nerrs);
        }
    }

Member Data Documentation

bitcount

template<typename Tbyte, int BYTE_ERASED>

pipewriter<int>* leansdr::rs_decoder< Tbyte, BYTE_ERASED >::bitcount

private

Definition at line 1305 of file dvb.h.

errcount

template<typename Tbyte, int BYTE_ERASED>

pipewriter<int> * leansdr::rs_decoder< Tbyte, BYTE_ERASED >::errcount

private

Definition at line 1305 of file dvb.h.

in

template<typename Tbyte, int BYTE_ERASED>

pipereader<rspacket<Tbyte> > leansdr::rs_decoder< Tbyte, BYTE_ERASED >::in

private

Definition at line 1303 of file dvb.h.

out

template<typename Tbyte, int BYTE_ERASED>

pipewriter<tspacket> leansdr::rs_decoder< Tbyte, BYTE_ERASED >::out

private

Definition at line 1304 of file dvb.h.

rs

template<typename Tbyte, int BYTE_ERASED>

rs_engine leansdr::rs_decoder< Tbyte, BYTE_ERASED >::rs

Definition at line 1217 of file dvb.h.

---

The documentation for this struct was generated from the following file:

• plugins/channelrx/demoddatv/leansdr/dvb.h