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/* -*- c++ -*- */
/*
* Copyright 2012 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 <gr_io_signature.h>
#include "repack_bits_bb_impl.h"
namespace gr {
namespace blocks {
repack_bits_bb::sptr
repack_bits_bb::make(int k, int l, const std::string &len_tag_key, bool align_output)
{
return gnuradio::get_initial_sptr (new repack_bits_bb_impl(k, l, len_tag_key, align_output));
}
repack_bits_bb_impl::repack_bits_bb_impl(int k, int l, const std::string &len_tag_key, bool align_output)
: gr_tagged_stream_block("repack_bits_bb",
gr_make_io_signature(1, 1, sizeof (char)),
gr_make_io_signature(1, 1, sizeof (char)),
len_tag_key),
d_k(k), d_l(l),
d_packet_mode(!len_tag_key.empty()),
d_in_index(0), d_out_index(0),
d_align_output(align_output)
{
if (d_k > 8 || d_k < 1 || d_l > 8 || d_l < 1) {
throw std::invalid_argument("k and l must be in [1, 8]");
}
set_relative_rate((double) d_k / d_l);
}
repack_bits_bb_impl::~repack_bits_bb_impl()
{
}
int
repack_bits_bb_impl::calculate_output_stream_length(const gr_vector_int &ninput_items)
{
int n_out_bytes_required = (ninput_items[0] * d_k) / d_l;
if ((ninput_items[0] * d_k) % d_l && (!d_packet_mode || (d_packet_mode && !d_align_output))) {
n_out_bytes_required++;
}
return n_out_bytes_required;
}
int
repack_bits_bb_impl::work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const unsigned char *in = (const unsigned char *) input_items[0];
unsigned char *out = (unsigned char *) output_items[0];
int bytes_to_write = noutput_items;
if (d_packet_mode) { // noutput_items could be larger than necessary
int bytes_to_read = ninput_items[0];
bytes_to_write = bytes_to_read * d_k / d_l;
if (!d_align_output && (((bytes_to_read * d_k) % d_l) != 0)) {
bytes_to_write++;
}
}
int n_read = 0;
int n_written = 0;
while(n_written < bytes_to_write && n_read < ninput_items[0]) {
if (d_out_index == 0) { // Starting a fresh byte
out[n_written] = 0;
}
out[n_written] |= ((in[n_read] >> d_in_index) & 0x01) << d_out_index;
d_in_index = (d_in_index + 1) % d_k;
d_out_index = (d_out_index + 1) % d_l;
if (d_in_index == 0) {
n_read++;
d_in_index = 0;
}
if (d_out_index == 0) {
n_written++;
d_out_index = 0;
}
}
if (d_packet_mode) {
if (d_out_index) {
n_written++;
d_out_index = 0;
}
} else {
consume_each(n_read);
}
return n_written;
}
} /* namespace blocks */
} /* namespace gr */
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