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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gsm_burst_ff.h>
#include <gr_io_signature.h>
#include <gr_math.h>
#include <stdio.h>
#include <gri_mmse_fir_interpolator_cc.h>
gsm_burst_ff_sptr gsm_make_burst_ff ()
{
return gsm_burst_ff_sptr (new gsm_burst_ff());
}
static const int MIN_IN = 1; // minimum number of input streams
static const int MAX_IN = 1; // maximum number of input streams
static const int MIN_OUT = 1; // minimum number of output streams
static const int MAX_OUT = 1; // maximum number of output streams
gsm_burst_ff::gsm_burst_ff () :
gr_block( "burst_ff",
gr_make_io_signature (MIN_IN, MAX_IN, sizeof (float)),
gr_make_io_signature (MIN_OUT, MAX_OUT, USEFUL_BITS * sizeof (float)))
{
set_history(1);
}
gsm_burst_ff::~gsm_burst_ff ()
{
}
void gsm_burst_ff::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
unsigned ninputs = ninput_items_required.size ();
for (unsigned i = 0; i < ninputs; i++)
ninput_items_required[i] = noutput_items * BBUF_SIZE + history();
}
int gsm_burst_ff::general_work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const float *in = (const float *) input_items[0];
float *out = (float *) output_items[0];
int ii=0;
int rval = 0; //default to no output
int n_input = ninput_items[0];
//fprintf(stderr,"#i=%d/#o=%d",n_input,noutput_items);
while (( rval < noutput_items) && ( ii < n_input ) ) {
assert(d_bbuf_pos <= BBUF_SIZE );
if (d_bbuf_pos >= 0) //could have been offset negative. TODO: perhaps better just to add some slack to the buffer
d_burst_buffer[d_bbuf_pos] = in[ii];
d_bbuf_pos++;
if ( d_bbuf_pos >= BBUF_SIZE ) {
if (get_burst()) {
//found a burst, send to output
//ensure that output data is in range
int b = d_burst_start;
if (b < 0)
b = 0;
else if (b >= 2 * MAX_CORR_DIST)
b = 2 * MAX_CORR_DIST - 1;
memcpy(out+rval*USEFUL_BITS, d_burst_buffer + b, USEFUL_BITS*sizeof(float));
rval++;
switch ( d_clock_options & QB_MASK ) {
case QB_QUARTER: //Can't do this in the FF version
case QB_FULL04: //extra bit on timeslot 0 & 4
if (!(d_ts%4))
d_bbuf_pos--;
break;
case QB_NONE: //don't adjust for quarter bits at all
default:
break;
}
d_last_burst_s_count = d_sample_count;
}
}
d_sample_count++;
ii++;
}
//fprintf(stderr,"/ii=%d/rval=%d\n",ii,rval);
consume_each (ii);
return rval;
}
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