deinterleave_impl.cc

/* -*- c++ -*- */
/*
 * Copyright 2012 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 "deinterleave_impl.h"
#include <gnuradio/io_signature.h>

namespace gr {
namespace blocks {

deinterleave::sptr deinterleave::make(size_t itemsize, unsigned int blocksize)
{
    return gnuradio::make_block_sptr<deinterleave_impl>(itemsize, blocksize);
}

deinterleave_impl::deinterleave_impl(size_t itemsize, unsigned int blocksize)
    : block("deinterleave",
            io_signature::make(1, 1, itemsize),
            io_signature::make(1, io_signature::IO_INFINITE, itemsize)),
      d_itemsize(itemsize),
      d_blocksize(blocksize),
      d_current_output(0)
{
    d_size_bytes = d_itemsize * d_blocksize;
    set_output_multiple(blocksize);
}

void deinterleave_impl::forecast(int noutput_items, gr_vector_int& ninput_items_required)
{
    ninput_items_required[0] = noutput_items * d_noutputs;
}

bool deinterleave_impl::check_topology(int ninputs, int noutputs)
{
    set_relative_rate(1, (uint64_t)noutputs);
    d_noutputs = noutputs;
    return true;
}

int deinterleave_impl::general_work(int noutput_items,
                                    gr_vector_int& ninput_items,
                                    gr_vector_const_void_star& input_items,
                                    gr_vector_void_star& output_items)
{
    const char* in = (const char*)input_items[0];
    char** out = (char**)&output_items[0];

    int count = 0, totalcount = noutput_items * d_noutputs;
    unsigned int skip = 0;
    unsigned int acc = 0;
    while (count < totalcount) {
        memcpy(out[d_current_output] + skip * d_size_bytes, in, d_size_bytes);
        in += d_size_bytes;
        produce(d_current_output, d_blocksize);
        d_current_output = (d_current_output + 1) % d_noutputs;

        // accumulate times through the loop; increment skip after a
        // full pass over the output streams.
        // This is separate than d_current_output since we could be in
        // the middle of a loop when we exit.
        acc++;
        if (acc >= d_noutputs) {
            skip++;
            acc = 0;
        }

        // Keep track of our loop counter
        count += d_blocksize;
    }
    consume_each(totalcount);
    return WORK_CALLED_PRODUCE;
}


} /* namespace blocks */
} /* namespace gr */