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/* -*- c++ -*- */
/*
* Copyright 2012,2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "stream_mux_impl.h"
#include <gnuradio/io_signature.h>
#include <cstring>
namespace gr {
namespace blocks {
stream_mux::sptr stream_mux::make(size_t itemsize, const std::vector<int>& lengths)
{
return gnuradio::make_block_sptr<stream_mux_impl>(itemsize, lengths);
}
stream_mux_impl::stream_mux_impl(size_t itemsize, const std::vector<int>& lengths)
: block("stream_mux",
io_signature::make(1, -1, itemsize),
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_mux_impl::forecast(int noutput_items, gr_vector_int& ninput_items_required)
{
unsigned ninputs = ninput_items_required.size();
for (unsigned i = 0; i < ninputs; i++) {
// Only active inputs *need* items, for the rest, it would just be nice
ninput_items_required[i] = (d_stream == i ? 1 : 0);
}
}
int stream_mux_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 out_index = 0; // Items written
gr_vector_int input_index(d_lengths.size()); // Items read
while (out_index < noutput_items) {
if (ninput_items[d_stream] <= input_index[d_stream]) {
break;
}
const int space_left_in_buffers = std::min(
noutput_items - out_index, // Space left in output buffer
ninput_items[d_stream] - input_index[d_stream] // Space left in input buffer
);
const int items_to_copy = std::min(space_left_in_buffers, d_residual);
const char* in = reinterpret_cast<const char*>(input_items[d_stream]) +
input_index[d_stream] * d_itemsize;
char* out = reinterpret_cast<char*>(output_items[0]);
memcpy(&out[out_index * d_itemsize], in, items_to_copy * d_itemsize);
std::vector<gr::tag_t> stream_t;
get_tags_in_window(stream_t,
d_stream,
input_index[d_stream],
input_index[d_stream] + items_to_copy);
for (auto& t : stream_t) {
t.offset = t.offset - nitems_read(d_stream) - input_index[d_stream] +
nitems_written(0) + out_index;
add_item_tag(0, t);
}
out_index += items_to_copy;
input_index[d_stream] += items_to_copy;
d_residual -= items_to_copy;
if (d_residual == 0) {
do { // Skip all those inputs 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
for (size_t i = 0; i < input_index.size(); i++) {
consume((int)i, input_index[i]);
}
return out_index;
} /* work */
} /* namespace blocks */
} /* namespace gr */
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