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/*----------------------------------------------------------------------------
libtunepimp -- The MusicBrainz tagging library.
Let a thousand taggers bloom!
Copyright (C) Robert Kaye 2003
This file is part of libtunepimp.
libtunepimp 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.
libtunepimp 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 libtunepimp; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$Id: metadata.cpp 8359 2006-08-07 20:34:50Z luks $
----------------------------------------------------------------------------*/
#include <math.h>
#include <stdio.h>
#include "metadata.h"
#include "../config.h"
using namespace std;
extern "C"
{
#include "astrcmp.h"
}
const int numAlbumTypeStrings = 11;
const char *albumTypeStrings[] =
{
"album", "single", "EP", "compilation", "soundtrack",
"spokenword", "interview", "audiobook", "live", "remix", "other", "\0"
};
const int numAlbumStatusStrings = 3;
const char *albumStatusStrings[] =
{
"official", "promotion", "bootleg", "\0"
};
TPAlbumType convertToAlbumType(const char *albumType)
{
for(int i = 0;; i++)
{
if (albumTypeStrings[i][0] == 0)
break;
if (strlen(albumType) > 4 && strcasecmp(albumTypeStrings[i], albumType + 4) == 0)
return (TPAlbumType)i;
if (strcasecmp(albumTypeStrings[i], albumType) == 0)
return (TPAlbumType)i;
}
return eAlbumType_Error;
}
void convertFromAlbumType(TPAlbumType type, string &albumType)
{
if ((int)type >= 0 && (int)type < numAlbumTypeStrings)
albumType = string(albumTypeStrings[(int)type]);
else
albumType = "unknown";
}
TPAlbumStatus convertToAlbumStatus(const char *albumStatus)
{
for(int i = 0;; i++)
{
if (albumStatusStrings[i][0] == 0)
break;
if (strlen(albumStatus) > 6 && strcasecmp(albumStatusStrings[i], albumStatus + 6) == 0)
return (TPAlbumStatus)i;
if (strcasecmp(albumStatusStrings[i], albumStatus) == 0)
return (TPAlbumStatus)i;
}
return eAlbumStatus_Error;
}
void convertFromAlbumStatus(TPAlbumStatus status, string &albumStatus)
{
if ((int)status >= 0 && (int)status < numAlbumStatusStrings)
albumStatus = string(albumStatusStrings[(int)status]);
else
albumStatus = "unknown";
}
const int numFlags = 6;
const int artistFlag = 0x01;
const int albumFlag = 0x02;
const int trackFlag = 0x04;
const int trackNumFlag = 0x08;
const int durationFlag = 0x10;
const int albumTypeFlag = 0x20;
const int lastFlag = 0x20;
const int proportions[6] =
{
10, // artist 0x01
9, // album 0x02
10, // track 0x04
8, // trackNum 0x08
10, // duration 0x10
8, // albumType 0x20
};
double MetadataCompare::durationSim(int trackA, int trackB) const
{
int diff;
diff = abs(trackA - trackB);
if (diff > 30000)
return 0;
return 1.0 - ((double)diff / (double)30000);
}
int MetadataCompare::compare(const Metadata &a, const Metadata &b) const
{
int index = 0, i;
Metadata A = a, B = b;
float weights[numFlags];
// If one of the two is completely empty of meaningful info, just return 0
if ((A.artist.empty() && A.album.empty() && A.track.empty()) ||
(B.artist.empty() && B.album.empty() && B.track.empty()))
return 0;
if (!A.artist.empty() && !B.artist.empty())
index |= artistFlag;
// If one album is blank, and the other is an album, copy it over to favor it.
//if (A.album.empty() && !B.album.empty() && B.albumType == eAlbumType_Album)
// A.album = B.album;
// Now check the reverse case as well.
//if (B.album.empty() && !A.album.empty() && A.albumType == eAlbumType_Album)
// B.album = A.album;
if (!A.album.empty() && !B.album.empty())
index |= albumFlag;
if (!A.track.empty() && !B.track.empty())
index |= trackFlag;
if (A.trackNum != 0 && B.trackNum != 0)
index |= trackNumFlag;
if (A.duration != 0 && B.duration != 0)
index |= durationFlag;
if (A.albumType != eAlbumType_Error && B.albumType != eAlbumType_Error)
index |= albumTypeFlag;
if (index == 0)
return 0;
int total = 0;
for(i = 0; i < numFlags; i++)
if ((index & (1 << i)) != 0)
{
weights[i] = proportions[i];
total += proportions[i];
}
else
weights[i] = 0.0;
for(i = 0; i < numFlags; i++)
weights[i] /= (float)total;
return (int)ceil(min(100.0, ((astrcmp(A.artist.c_str(), B.artist.c_str()) * weights[0]) +
(astrcmp(A.album.c_str(), B.album.c_str()) * weights[1]) +
(astrcmp(A.track.c_str(), B.track.c_str()) * weights[2]) +
(durationSim(A.duration, B.duration) * weights[3]) +
(((A.trackNum == B.trackNum) ? 1.0 : 0.0) * weights[4]) +
(((A.albumType == B.albumType) ? 1.0 : 0.0) * weights[5])) * 100));
}
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