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/* -*- c++ -*- */
/*
* Copyright 2020 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 "stream_demux_impl.h"
#include <gnuradio/io_signature.h>
#include <cstring>
namespace gr {
namespace blocks {
stream_demux::sptr stream_demux::make(size_t itemsize, const std::vector<int>& lengths)
{
return gnuradio::make_block_sptr<stream_demux_impl>(itemsize, lengths);
}
stream_demux_impl::stream_demux_impl(size_t itemsize, const std::vector<int>& lengths)
: gr::block("stream_demux",
gr::io_signature::make(1, 1, itemsize),
gr::io_signature::make(1, -1, itemsize)),
d_itemsize(itemsize),
d_lengths(lengths)
{
while (d_lengths[d_stream] == 0) {
d_stream++;
if (d_stream == d_lengths.size()) {
throw std::invalid_argument("At least one size must be non-zero.");
}
}
d_residual = d_lengths[d_stream];
set_tag_propagation_policy(TPP_DONT);
}
void stream_demux_impl::forecast(int noutput_items, gr_vector_int& ninput_items_required)
{
std::fill(ninput_items_required.begin(), ninput_items_required.end(), 1);
}
int stream_demux_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
int input_index = 0; // Items read
gr_vector_int output_index(d_lengths.size()); // Items written
while (input_index < ninput_items[0]) {
if (noutput_items <= output_index[d_stream]) {
break;
}
const int space_left_in_buffers =
std::min(ninput_items[0] - input_index, // Space left in input buffer
noutput_items - output_index[d_stream] // Space left in output buffer
);
const int items_to_copy = std::min(space_left_in_buffers, d_residual);
const char* in =
reinterpret_cast<const char*>(input_items[0]) + input_index * d_itemsize;
char* out = reinterpret_cast<char*>(output_items[d_stream]);
memcpy(&out[output_index[d_stream] * d_itemsize], in, items_to_copy * d_itemsize);
std::vector<gr::tag_t> stream_t;
get_tags_in_window(stream_t, 0, input_index, input_index + items_to_copy);
for (auto& t : stream_t) {
t.offset = t.offset - nitems_read(0) - input_index +
nitems_written(d_stream) + output_index[d_stream];
add_item_tag(d_stream, t);
}
output_index[d_stream] += items_to_copy;
input_index += items_to_copy;
d_residual -= items_to_copy;
if (d_residual == 0) {
do { // Skip all those outputs with zero length
d_stream = (d_stream + 1) % d_lengths.size();
} while (d_lengths[d_stream] == 0);
d_residual = d_lengths[d_stream];
} else {
break;
}
} // while
consume(0, input_index);
for (size_t i = 0; i < output_index.size(); i++) {
produce((int)i, output_index[i]);
}
return WORK_CALLED_PRODUCE;
}
} /* namespace blocks */
} /* namespace gr */
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