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/* -*- c++ -*- */
/*
* Copyright 2014 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 3, 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 "async_encoder_impl.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
#include <stdio.h>
namespace gr {
namespace fec {
async_encoder::sptr
async_encoder::make(generic_encoder::sptr my_encoder,
bool rev_unpack, bool rev_pack)
{
return gnuradio::get_initial_sptr
(new async_encoder_impl(my_encoder, rev_unpack, rev_pack));
}
async_encoder_impl::async_encoder_impl(generic_encoder::sptr my_encoder,
bool rev_unpack, bool rev_pack)
: block("async_encoder",
io_signature::make(0,0,0),
io_signature::make(0,0,0)),
d_input_item_size(sizeof(char)), d_output_item_size(sizeof(char))
{
d_in_port = pmt::mp("in");
d_out_port = pmt::mp("out");
d_encoder = my_encoder;
d_unpack = new blocks::kernel::unpack_k_bits(8);
d_pack = new blocks::kernel::pack_k_bits(8);
d_rev_unpack = rev_unpack;
d_rev_pack = rev_pack;
message_port_register_in(d_in_port);
message_port_register_out(d_out_port);
set_msg_handler(d_in_port, boost::bind(&async_encoder_impl::encode, this ,_1) );
}
async_encoder_impl::~async_encoder_impl()
{
delete d_unpack;
delete d_pack;
}
void
async_encoder_impl::encode(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bytes(pmt::cdr(msg));
int nbytes = pmt::length(bytes);
int nbits = 8*nbytes;
size_t o0 = 0;
const uint8_t* bytes_in = pmt::u8vector_elements(bytes, o0);
uint8_t* bits_in = (uint8_t*)volk_malloc(nbits*sizeof(uint8_t),
volk_get_alignment());
// Encoder takes a stream of bits, but PDU's are received as
// bytes, so we unpack them here.
if(d_rev_unpack)
d_unpack->unpack_rev(bits_in, bytes_in, nbytes);
else
d_unpack->unpack(bits_in, bytes_in, nbytes);
d_encoder->set_frame_size(nbits);
int nbits_out = d_encoder->get_output_size();
int nbytes_out = ceilf(static_cast<float>(nbits_out)/8.0f);
// buffers for bits/bytes to go to
uint8_t* bits_out = (uint8_t*)volk_malloc(nbits_out*sizeof(uint8_t),
volk_get_alignment());
pmt::pmt_t outvec = pmt::make_u8vector(nbytes_out, 0x00);
uint8_t* bytes_out = pmt::u8vector_writable_elements(outvec, o0);
// ENCODE!
d_encoder->generic_work((void*)bits_in, (void*)bits_out);
// Encoder produces bits, so repack them here to bytes.
if(d_rev_pack)
d_pack->pack_rev(bytes_out, bits_out, nbytes_out);
else
d_pack->pack(bytes_out, bits_out, nbytes_out);
pmt::pmt_t msg_pair = pmt::cons(meta, outvec);
message_port_pub(d_out_port, msg_pair);
volk_free(bits_in);
volk_free(bits_out);
}
int
async_encoder_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
return noutput_items;
}
} /* namespace fec */
} /* namespace gr */
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