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/* -*- c++ -*- */
/*
* Copyright 2007,2012-2013 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.
*/
#ifndef INCLUDED_BLOCKS_DELAY_H
#define INCLUDED_BLOCKS_DELAY_H
#include <gnuradio/blocks/api.h>
#include <gnuradio/block.h>
namespace gr {
namespace blocks {
/*!
* \brief delay the input by a certain number of samples
* \ingroup misc_blk
*
* Positive delays insert zero items at the beginning of the stream.
* Negative delays discard items from the stream.
*
* You cannot initialize this block with a negative delay,
* however. That leads to a causality issue with the buffers when
* they are initialized. If you need to negetively delay one path,
* then put the positive delay on the other path instead.
*/
class BLOCKS_API delay : virtual public block
{
public:
// gr::blocks::delay::sptr
typedef boost::shared_ptr<delay> sptr;
/*!
* \brief Make a delay block.
* \param itemsize size of the data items.
* \param delay number of samples to delay stream (>= 0).
*/
static sptr make(size_t itemsize, int delay);
virtual int dly() const = 0;
/*!
* \brief Reset the delay.
* \param d change the delay value. This can be a positive or
* negative value.
*/
virtual void set_dly(int d) = 0;
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_BLOCKS_DELAY_H */
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