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/* -*- c++ -*- */
/*
* Copyright 2005 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_GR_THROTTLE_H
#define INCLUDED_GR_THROTTLE_H
#include <gr_sync_block.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
class gr_throttle;
typedef boost::shared_ptr<gr_throttle> gr_throttle_sptr;
gr_throttle_sptr gr_make_throttle(size_t itemsize, double samples_per_sec);
/*!
* \brief throttle flow of samples such that the average rate does not exceed samples_per_sec.
* \ingroup misc_blk
*
* input: one stream of itemsize; output: one stream of itemsize
*
* N.B. this should only be used in GUI apps where there is no other
* rate limiting block. It is not intended nor effective at precisely
* controlling the rate of samples. That should be controlled by a
* source or sink tied to sample clock. E.g., a USRP or audio card.
*/
class gr_throttle : public gr_sync_block
{
friend gr_throttle_sptr gr_make_throttle(size_t itemsize, double samples_per_sec);
size_t d_itemsize;
double d_samples_per_sec;
double d_total_samples;
#ifdef HAVE_SYS_TIME_H
struct timeval d_start;
#endif
gr_throttle(size_t itemsize, double samples_per_sec);
public:
~gr_throttle();
int work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
#endif /* INCLUDED_GR_THROTTLE_H */
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