kopia lustrzana https://github.com/f4exb/sdrangel
349 wiersze
8.6 KiB
C++
349 wiersze
8.6 KiB
C++
#ifndef LEANSDR_GENERIC_H
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#define LEANSDR_GENERIC_H
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#include <sys/types.h>
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#include <unistd.h>
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#include "leansdr/math.h"
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namespace leansdr {
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//////////////////////////////////////////////////////////////////////
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// Simple blocks
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//////////////////////////////////////////////////////////////////////
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// [file_reader] reads raw data from a file descriptor into a [pipebuf].
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// If the file descriptor is seekable, data can be looped.
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template<typename T>
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struct file_reader : runnable {
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file_reader(scheduler *sch, int _fdin, pipebuf<T> &_out)
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: runnable(sch, _out.name),
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loop(false),
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fdin(_fdin), out(_out)
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{
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}
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void run() {
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size_t size = out.writable() * sizeof(T);
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if ( ! size ) return;
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again:
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ssize_t nr = read(fdin, out.wr(), size);
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if ( nr < 0 ) fatal("read");
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if ( ! nr ) {
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if ( ! loop ) return;
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if ( sch->debug ) fprintf(stderr, "%s looping\n", name);
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off_t res = lseek(fdin, 0, SEEK_SET);
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if ( res == (off_t)-1 ) fatal("lseek");
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goto again;
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}
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// Always stop at element boundary (may block)
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size_t partial = nr % sizeof(T);
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size_t remain = partial ? sizeof(T)-partial : 0;
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while ( remain ) {
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if ( sch->debug ) fprintf(stderr, "+");
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ssize_t nr2 = read(fdin, (char*)out.wr()+nr, remain);
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if ( nr2 <= 0 ) fatal("partial read");
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nr += nr2;
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remain -= nr2;
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}
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out.written(nr / sizeof(T));
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}
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bool loop;
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private:
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int fdin;
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pipewriter<T> out;
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};
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// [file_writer] writes raw data from a [pipebuf] to a file descriptor.
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template<typename T>
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struct file_writer : runnable {
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file_writer(scheduler *sch, pipebuf<T> &_in, int _fdout) :
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runnable(sch, _in.name),
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in(_in), fdout(_fdout) {
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}
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void run() {
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int size = in.readable() * sizeof(T);
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if ( ! size ) return;
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int nw = write(fdout, in.rd(), size);
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if ( ! nw ) fatal("pipe");
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if ( nw < 0 ) fatal("write");
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if ( nw % sizeof(T) ) fatal("partial write");
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in.read(nw/sizeof(T));
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}
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private:
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pipereader<T> in;
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int fdout;
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};
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// [file_printer] writes data from a [pipebuf] to a file descriptor,
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// with printf-style formatting and optional scaling.
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template<typename T>
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struct file_printer : runnable {
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file_printer(scheduler *sch, const char *_format,
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pipebuf<T> &_in, int _fdout,
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int _decimation=1) :
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runnable(sch, _in.name),
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scale(1), decimation(_decimation),
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in(_in), format(_format), fdout(_fdout), phase(0) {
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}
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void run() {
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int n = in.readable();
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T *pin=in.rd(), *pend=pin+n;
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for ( ; pin<pend; ++pin ) {
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if ( ++phase >= decimation ) {
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phase -= decimation;
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char buf[256];
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int len = snprintf(buf, sizeof(buf), format, (*pin)*scale);
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if ( len < 0 ) fatal("obsolete glibc");
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int nw = write(fdout, buf, len);
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if ( nw != len ) fatal("partial write");
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}
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}
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in.read(n);
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}
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T scale;
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int decimation;
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private:
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pipereader<T> in;
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const char *format;
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int fdout;
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int phase;
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};
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// [file_carrayprinter] writes all data available from a [pipebuf]
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// to a file descriptor on a single line.
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// Special case for complex.
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template<typename T>
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struct file_carrayprinter : runnable {
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file_carrayprinter(scheduler *sch,
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const char *_head,
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const char *_format,
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const char *_sep,
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const char *_tail,
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pipebuf< complex<T> > &_in, int _fdout) :
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runnable(sch, _in.name),
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scale(1), fixed_size(0), in(_in),
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head(_head), format(_format), sep(_sep), tail(_tail),
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fout(fdopen(_fdout,"w")) {
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}
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void run() {
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int n, nmin = fixed_size ? fixed_size : 1;
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while ( (n=in.readable()) >= nmin ) {
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if ( fixed_size ) n = fixed_size;
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if ( fout ) {
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fprintf(fout, head, n);
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complex<T> *pin = in.rd();
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for ( int i=0; i<n; ++i ) {
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if ( i ) fprintf(fout, "%s", sep);
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fprintf(fout, format, pin[i].re*scale, pin[i].im*scale);
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}
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fprintf(fout, "%s", tail);
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}
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fflush(fout);
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in.read(n);
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}
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}
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T scale;
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int fixed_size; // Number of elements per batch, or 0.
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private:
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pipereader< complex<T> > in;
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const char *head, *format, *sep, *tail;
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FILE *fout;
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};
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template<typename T, int N>
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struct file_vectorprinter : runnable {
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file_vectorprinter(scheduler *sch,
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const char *_head,
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const char *_format,
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const char *_sep,
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const char *_tail,
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pipebuf<T[N]> &_in, int _fdout) :
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runnable(sch, _in.name), scale(1), in(_in),
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head(_head), format(_format), sep(_sep), tail(_tail) {
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fout = fdopen(_fdout,"w");
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if ( ! fout ) fatal("fdopen");
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}
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void run() {
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while ( in.readable() >= 1 ) {
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fprintf(fout, head, N);
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T (*pin)[N] = in.rd();
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for ( int i=0; i<N; ++i ) {
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if ( i ) fprintf(fout, "%s", sep);
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fprintf(fout, format, (*pin)[i]*scale);
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}
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fprintf(fout, "%s", tail);
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in.read(1);
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}
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fflush(fout);
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}
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T scale;
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private:
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pipereader<T[N]> in;
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const char *head, *format, *sep, *tail;
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FILE *fout;
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};
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// [itemcounter] writes the number of input items to the output [pipebuf].
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// [Tout] must be a numeric type.
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template<typename Tin, typename Tout>
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struct itemcounter : runnable {
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itemcounter(scheduler *sch, pipebuf<Tin> &_in, pipebuf<Tout> &_out)
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: runnable(sch, "itemcounter"),
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in(_in), out(_out) {
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}
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void run() {
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if ( out.writable() < 1 ) return;
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unsigned long count = in.readable();
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if ( ! count ) return;
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out.write(count);
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in.read(count);
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}
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private:
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pipereader<Tin> in;
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pipewriter<Tout> out;
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};
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// [decimator] forwards 1 in N sample.
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template<typename T>
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struct decimator : runnable {
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unsigned int d;
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decimator(scheduler *sch, int _d, pipebuf<T> &_in, pipebuf<T> &_out)
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: runnable(sch, "decimator"),
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d(_d),
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in(_in), out(_out) {
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}
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void run() {
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unsigned long count = min(in.readable()/d, out.writable());
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T *pin=in.rd(), *pend=pin+count*d, *pout=out.wr();
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for ( ; pin<pend; pin+=d, ++pout )
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*pout = *pin;
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in.read(count*d);
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out.written(count);
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}
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private:
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pipereader<T> in;
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pipewriter<T> out;
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};
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// [rate_estimator] accumulates counts of two quantities
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// and periodically outputs their ratio.
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template<typename T>
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struct rate_estimator : runnable {
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int sample_size;
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rate_estimator(scheduler *sch,
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pipebuf<int> &_num, pipebuf<int> &_den,
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pipebuf<float> &_rate)
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: runnable(sch, "rate_estimator"),
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sample_size(10000),
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num(_num), den(_den), rate(_rate),
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acc_num(0), acc_den(0) {
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}
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void run() {
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if ( rate.writable() < 1 ) return;
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int count = min(num.readable(), den.readable());
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int *pnum=num.rd(), *pden=den.rd();
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for ( int n=count; n--; ++pnum,++pden ) {
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acc_num += *pnum;
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acc_den += *pden;
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}
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num.read(count);
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den.read(count);
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if ( acc_den >= sample_size ) {
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rate.write((float)acc_num / acc_den);
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acc_num = acc_den = 0;
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}
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}
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private:
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pipereader<int> num, den;
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pipewriter<float> rate;
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T acc_num, acc_den;
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};
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// SERIALIZER
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template<typename Tin, typename Tout>
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struct serializer : runnable {
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serializer(scheduler *sch, pipebuf<Tin> &_in, pipebuf<Tout> &_out)
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: nin(max((size_t)1,sizeof(Tin)/sizeof(Tout))),
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nout(max((size_t)1,sizeof(Tout)/sizeof(Tin))),
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in(_in), out(_out,nout)
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{
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if ( nin*sizeof(Tin) != nout*sizeof(Tout) )
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fail("serializer: incompatible sizes");
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}
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void run() {
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while ( in.readable()>=nin && out.writable()>=nout ) {
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memcpy(out.wr(), in.rd(), nout*sizeof(Tout));
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in.read(nin);
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out.written(nout);
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}
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}
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private:
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int nin, nout;
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pipereader<Tin> in;
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pipewriter<Tout> out;
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}; // serializer
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// [buffer_reader] reads from a user-supplied buffer.
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template<typename T>
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struct buffer_reader : runnable {
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buffer_reader(scheduler *sch, T *_data, int _count, pipebuf<T> &_out)
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: runnable(sch, "buffer_reader"),
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data(_data), count(_count), out(_out), pos(0) {
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}
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void run() {
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int n = min(out.writable(), (unsigned long)(count-pos));
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memcpy(out.wr(), &data[pos], n*sizeof(T));
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pos += n;
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out.written(n);
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}
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private:
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T *data;
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int count;
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pipewriter<T> out;
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int pos;
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}; // buffer_reader
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// [buffer_writer] writes to a user-supplied buffer.
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template<typename T>
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struct buffer_writer : runnable {
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buffer_writer(scheduler *sch, pipebuf<T> &_in, T *_data, int _count)
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: runnable(sch, "buffer_reader"),
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in(_in), data(_data), count(_count), pos(0) {
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}
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void run() {
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int n = min(in.readable(), (unsigned long)(count-pos));
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memcpy(&data[pos], in.rd(), n*sizeof(T));
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in.read(n);
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pos += n;
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}
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private:
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pipereader<T> in;
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T *data;
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int count;
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int pos;
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}; // buffer_writer
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} // namespace
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#endif // LEANSDR_GENERIC_H
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