/* -*- c++ -*- */
/*
 * Copyright 2013-2014 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 "encoder_impl.h"
#include <gnuradio/io_signature.h>
#include <stdio.h>

namespace gr {
namespace fec {

encoder::sptr encoder::make(generic_encoder::sptr my_encoder,
                            size_t input_item_size,
                            size_t output_item_size)
{
    return gnuradio::get_initial_sptr(
        new encoder_impl(my_encoder, input_item_size, output_item_size));
}

encoder_impl::encoder_impl(generic_encoder::sptr my_encoder,
                           size_t input_item_size,
                           size_t output_item_size)
    : block("fec_encoder",
            io_signature::make(1, 1, input_item_size),
            io_signature::make(1, 1, output_item_size)),
      d_input_item_size(input_item_size),
      d_output_item_size(output_item_size)
{
    set_fixed_rate(true);
    set_relative_rate((uint64_t)my_encoder->get_output_size(),
                      (uint64_t)my_encoder->get_input_size());
    set_output_multiple(my_encoder->get_output_size());
    d_encoder = my_encoder;

    d_input_size = d_encoder->get_input_size() * d_input_item_size;
    d_output_size = d_encoder->get_output_size() * d_output_item_size;
}

encoder_impl::~encoder_impl() {}

int encoder_impl::fixed_rate_ninput_to_noutput(int ninput)
{
    return (int)(0.5 + ninput * relative_rate());
}

int encoder_impl::fixed_rate_noutput_to_ninput(int noutput)
{
    return (int)(0.5 + noutput / relative_rate());
}

void encoder_impl::forecast(int noutput_items, gr_vector_int& ninput_items_required)
{
    ninput_items_required[0] = fixed_rate_noutput_to_ninput(noutput_items);
}

int 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)
{
    char* inbuffer = (char*)input_items[0];
    char* outbuffer = (char*)output_items[0];

    for (int i = 0; i < noutput_items / output_multiple(); i++) {
        d_encoder->generic_work((void*)(inbuffer + (i * d_input_size)),
                                (void*)(outbuffer + (i * d_output_size)));
    }

    consume_each(fixed_rate_noutput_to_ninput(noutput_items));
    return noutput_items;
}

} /* namespace fec */
} /* namespace gr */
