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/* -*- c++ -*- */
/*
* Copyright 2005 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gsm_fr_decode_ps.h"
extern "C"{
#include "gsm/gsm.h"
}
#include <gr_io_signature.h>
#include <stdexcept>
#include <assert.h>
gsm_fr_decode_ps_sptr
gsm_fr_make_decode_ps ()
{
return gsm_fr_decode_ps_sptr (new gsm_fr_decode_ps ());
}
gsm_fr_decode_ps::gsm_fr_decode_ps ()
: gr_sync_interpolator ("gsm_fr_decode_ps",
gr_make_io_signature (1, 1, sizeof (gsm_frame)),
gr_make_io_signature (1, 1, sizeof (short)),
GSM_SAMPLES_PER_FRAME)
{
if ((d_gsm = gsm_create ()) == 0)
throw std::runtime_error ("gsm_fr_decode_ps: gsm_create failed");
}
gsm_fr_decode_ps::~gsm_fr_decode_ps ()
{
gsm_destroy (d_gsm);
}
int
gsm_fr_decode_ps::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const unsigned char *in = (const unsigned char *) input_items[0];
short *out = (short *) output_items[0];
assert ((noutput_items % GSM_SAMPLES_PER_FRAME) == 0);
for (int i = 0; i < noutput_items; i += GSM_SAMPLES_PER_FRAME){
gsm_decode (d_gsm, const_cast<unsigned char*>(in), out);
in += sizeof (gsm_frame);
out += GSM_SAMPLES_PER_FRAME;
}
return noutput_items;
}
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