mirror of
https://github.com/rodamaral/lsnes.git
synced 2025-04-02 10:42:15 -04:00
62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/***************************************************************************
|
|
* Copyright (C) 2008 by Sindre Aamås *
|
|
* sinamas@users.sourceforge.net *
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License version 2 as *
|
|
* published by the Free Software Foundation. *
|
|
* *
|
|
* This program 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 version 2 for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU General Public License *
|
|
* version 2 along with this program; if not, write to the *
|
|
* Free Software Foundation, Inc., *
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
|
|
***************************************************************************/
|
|
#ifndef RATEEST_H
|
|
#define RATEEST_H
|
|
|
|
#include "usec.h"
|
|
#include <cstddef>
|
|
#include <deque>
|
|
#include <utility>
|
|
|
|
class RateEst {
|
|
public:
|
|
RateEst() { *this = RateEst(0, 0); }
|
|
RateEst(long nominalSampleRate, std::size_t maxValidFeedPeriodSamples);
|
|
void resetLastFeedTimeStamp() { last_ = 0; }
|
|
void feed(std::ptrdiff_t samples, usec_t usecsNow = getusecs());
|
|
long result() const { return (srate_ + est_scale / 2) >> est_lshift; }
|
|
|
|
private:
|
|
class SumQueue {
|
|
public:
|
|
SumQueue() : samples_(0), usecs_(0) {}
|
|
std::ptrdiff_t samples() const { return samples_; }
|
|
usec_t usecs() const { return usecs_; }
|
|
void push(std::ptrdiff_t samples, usec_t usecs);
|
|
void pop();
|
|
|
|
private:
|
|
std::deque< std::pair<std::ptrdiff_t, usec_t> > q_;
|
|
std::ptrdiff_t samples_;
|
|
usec_t usecs_;
|
|
};
|
|
|
|
enum { est_lshift = 5 };
|
|
enum { est_scale = 1 << est_lshift };
|
|
|
|
SumQueue sumq_;
|
|
long srate_;
|
|
long reference_;
|
|
usec_t maxPeriod_;
|
|
usec_t last_;
|
|
usec_t usecs_;
|
|
std::ptrdiff_t samples_;
|
|
};
|
|
|
|
#endif
|