1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/* -*- c++ -*- */
/*
* Copyright 2004,2009,2013 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 "head_impl.h"
#include <gnuradio/io_signature.h>
#include <string.h>
namespace gr {
namespace blocks {
head::sptr head::make(size_t sizeof_stream_item, uint64_t nitems)
{
return gnuradio::get_initial_sptr(new head_impl(sizeof_stream_item, nitems));
}
head_impl::head_impl(size_t sizeof_stream_item, uint64_t nitems)
: sync_block("head",
io_signature::make(1, 1, sizeof_stream_item),
io_signature::make(1, 1, sizeof_stream_item)),
d_nitems(nitems),
d_ncopied_items(0)
{
}
head_impl::~head_impl() {}
int head_impl::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
if (d_ncopied_items >= d_nitems)
return -1; // Done!
unsigned n = std::min(d_nitems - d_ncopied_items, (uint64_t)noutput_items);
if (n == 0)
return 0;
memcpy(output_items[0], input_items[0], n * input_signature()->sizeof_stream_item(0));
d_ncopied_items += n;
return n;
}
} /* namespace blocks */
} /* namespace gr */
|
