annotate base/HitCount.h @ 1288:5ef9b4d4bbdb 3.0-integration

Filter out Xing/LAME info frames, rather than letting them go to the mp3 decoder as if they were audio frames. Fixes the 1152-sample zero pad at start of some decoded mp3 files (distinct from decoder delay). The logic here is based on the madplay code.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    This program 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 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef HIT_COUNT_H
#define HIT_COUNT_H

#include <string>
#include <iostream>

/**
 * Profile class for counting cache hits and the like.
 */
class HitCount
{
public:
    HitCount(std::string name) :
	m_name(name),
	m_hit(0),
	m_partial(0),
	m_miss(0)
    { }
    
    ~HitCount() {
#ifndef NO_HIT_COUNTS
	using namespace std;
	int total = m_hit + m_partial + m_miss;
	cerr << "Hit count: " << m_name << ": ";
	if (m_partial > 0) {
	    cerr << m_hit << " hits, " << m_partial << " partial, "
		 << m_miss << " misses";
	} else {
	    cerr << m_hit << " hits, " << m_miss << " misses";
	}
	if (total > 0) {
	    if (m_partial > 0) {
		cerr << " (" << ((m_hit * 100.0) / total) << "%, "
		     << ((m_partial * 100.0) / total) << "%, "
		     << ((m_miss * 100.0) / total) << "%)";
	    } else {
		cerr << " (" << ((m_hit * 100.0) / total) << "%, "
		     << ((m_miss * 100.0) / total) << "%)";
	    }
	}
	cerr << endl;
#endif
    }

    void hit() { ++m_hit; }
    void partial() { ++m_partial; }
    void miss() { ++m_miss; }

private:
    std::string m_name;
    int m_hit;
    int m_partial;
    int m_miss;
};

#endif