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//=============================================================================
//
// File : mp_mp3.cpp
// Creation date : Fri Mar 25 20:01:25 2005 GMT by Szymon Stefanek
//
// This file is part of the KVirc irc client distribution
// Copyright (C) 2005-2008 Szymon Stefanek (pragma at kvirc dot net)
//
// This file is based on the mp3tech.c. It is released under the original
// license and the original copyright notice follows.
//
// mp3tech.c
//
// Copyright (C) 2000 Cedric Tefft <cedric@earthling.net>
//
// 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.
//
// 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// This file is based in part on:
//
// * MP3Info 0.5 by Ricardo Cerqueira <rmc@rccn.net>
// * MP3Stat 0.9 by Ed Sweetman <safemode@voicenet.com> and
// Johannes Overmann <overmann@iname.com>
//
// There has been also a remarkable work by Cristopher Tieckle (Crissi)
//
//=============================================================================
#include "mp_mp3.h"
#include "kvi_options.h"
#include <QFileInfo>
#include <QTextCodec>
#define MAXGENRE 147
#define GENREROWS 50
/*
The Information is stored in the last 128 bytes of an MP3. The Tag
has got the following fields, and the offsets given here, are from
0-127.
Field Length Offsets
Tag 3 0-2
Songname 30 3-32
Artist 30 33-62
Album 30 63-92
Year 4 93-96
Comment 30 97-126
Genre 1 127
The string-fields contain ASCII-data, coded in ISO-Latin 1 codepage.
Strings which are smaller than the field length are padded with zero-
bytes.
Tag: The tag is valid if this field contains the string "TAG". This
has to be uppercase!
Songname: This field contains the title of the MP3 (string as
above).
Artist: This field contains the artist of the MP3 (string as above).
Album: this field contains the album where the MP3 comes from
(string as above).
Year: this field contains the year when this song has originally
been released (string as above).
Comment: this field contains a comment for the MP3 (string as
above). Revision to this field has been made in ID3v1.1. See
A.4.
Genre: this byte contains the offset of a genre in a predefined
list the byte is treated as an unsigned byte. The offset is
starting from 0. See A.3.
*/
const char *typegenre [MAXGENRE+2] =
{
"Blues","Classic Rock","Country","Dance","Disco","Funk","Grunge",
"Hip-Hop","Jazz","Metal","New Age","Oldies","Other","Pop","R&B",
"Rap","Reggae","Rock","Techno","Industrial","Alternative","Ska",
"Death Metal","Pranks","Soundtrack","Euro-Techno","Ambient",
"Trip-Hop","Vocal","Jazz+Funk","Fusion","Trance","Classical",
"Instrumental","Acid","House","Game","Sound Clip","Gospel","Noise",
"Alt. Rock","Bass","Soul","Punk","Space","Meditative",
"Instrumental Pop","Instrumental Rock","Ethnic","Gothic",
"Darkwave","Techno-Industrial","Electronic","Pop-Folk","Eurodance",
"Dream","Southern Rock","Comedy","Cult","Gangsta Rap","Top 40",
"Christian Rap","Pop/Funk","Jungle","Native American","Cabaret",
"New Wave","Psychedelic","Rave","Showtunes","Trailer","Lo-Fi",
"Tribal","Acid Punk","Acid Jazz","Polka","Retro","Musical",
"Rock & Roll","Hard Rock","Folk","Folk/Rock","National Folk",
"Swing","Fast-Fusion","Bebob","Latin","Revival","Celtic",
"Bluegrass","Avantgarde","Gothic Rock","Progressive Rock",
"Psychedelic Rock","Symphonic Rock","Slow Rock","Big Band",
"Chorus","Easy Listening","Acoustic","Humour","Speech","Chanson",
"Opera","Chamber Music","Sonata","Symphony","Booty Bass","Primus",
"Porn Groove","Satire","Slow Jam","Club","Tango","Samba",
"Folklore","Ballad","Power Ballad","Rhythmic Soul","Freestyle",
"Duet","Punk Rock","Drum Solo","A Cappella","Euro-House",
"Dance Hall","Goa","Drum & Bass","Club-House","Hardcore","Terror",
"Indie","BritPop","Negerpunk","Polsk Punk","Beat",
"Christian Gangsta Rap","Heavy Metal","Black Metal","Crossover",
"Contemporary Christian","Christian Rock","Merengue","Salsa",
"Thrash Metal","Anime","JPop","Synthpop",""
};
const char * get_typegenre(int idx)
{
if(idx > MAXGENRE)return typegenre[12];
return typegenre[idx];
}
int galphagenreindex[MAXGENRE+2] =
{
148,123,74,73,34,99,40,20,26,145,90,
116,41,135,85,96,138,89,0,107,132,65,88,
104,102,97,136,61,141,1,32,128,112,57,140,
2,139,58,125,3,50,22,4,55,127,122,120,
98,52,48,124,25,54,84,81,115,80,119,5,
30,36,59,126,38,91,49,6,79,129,137,7,
35,100,131,19,46,47,33,146,29,8,63,86,
71,45,142,9,77,82,64,133,10,66,39,11,
103,12,75,134,53,62,13,109,117,23,108,92,
93,67,121,43,14,15,68,16,76,87,118,78,
17,143,114,110,69,21,111,95,105,42,37,24,
56,44,101,83,94,106,147,113,51,18,130,144,
60,70,31,72,27,28
};
int *alphagenreindex=&(galphagenreindex[1]);
int layer_tab[4]= {0, 3, 2, 1};
int frequencies[3][4] =
{
{22050,24000,16000,50000}, /* MPEG 2.0 */
{44100,48000,32000,50000}, /* MPEG 1.0 */
{11025,12000,8000,50000} /* MPEG 2.5 */
};
int bitrate[2][3][14] =
{
{ /* MPEG 2.0 */
{32,48,56,64,80,96,112,128,144,160,176,192,224,256}, /* layer 1 */
{8,16,24,32,40,48,56,64,80,96,112,128,144,160}, /* layer 2 */
{8,16,24,32,40,48,56,64,80,96,112,128,144,160} /* layer 3 */
},
{ /* MPEG 1.0 */
{32,64,96,128,160,192,224,256,288,320,352,384,416,448}, /* layer 1 */
{32,48,56,64,80,96,112,128,160,192,224,256,320,384}, /* layer 2 */
{32,40,48,56,64,80,96,112,128,160,192,224,256,320} /* layer 3 */
}
};
int frame_size_index[] = {24000, 72000, 72000};
const char *mode_text[] =
{
"Stereo", "Joint Stereo", "Dual Channel", "Mono"
};
const char *emphasis_text[] =
{
"None", "50/15 Microseconds", "Reserved", "CCITT J 17"
};
void resetmp3infoStruct(mp3info *i)
{
i->file=0;
i->datasize=0;
i->header_isvalid=0;
memset(&i->header,0,sizeof(i->header));
i->id3_isvalid=0;
memset(&i->id3,0,sizeof(i->id3));
i->vbr=0;
i->vbr_average=0;
i->seconds=0;
i->frames=0;
i->badframes=0;
}
int get_mp3_info(mp3info *mp3)
{
int l,bitrate,lastrate,counter=0;
// mp3header header;
int sample_pos,data_start=0;
QFile fi(mp3->filename);
mp3->datasize=fi.size();//filestat.st_size;
get_id3(mp3);
if(get_first_header(mp3,0L))
{
data_start=ftell(mp3->file);
lastrate=15-mp3->header.bitrate;
while((counter < NUM_SAMPLES) && lastrate)
{
sample_pos=(counter*(mp3->datasize/NUM_SAMPLES+1))+data_start;
if(get_first_header(mp3,sample_pos))
{
bitrate=15-mp3->header.bitrate;
} else {
bitrate=-1;
}
if(bitrate != lastrate)
{
mp3->vbr=1;
}
lastrate=bitrate;
counter++;
}
mp3->frames=(mp3->datasize-data_start)/(l=frame_length(&mp3->header));
mp3->seconds = (int)((float)(frame_length(&mp3->header)*mp3->frames)/
(float)(header_bitrate(&mp3->header)*125)+0.5);
mp3->vbr_average = (float)header_bitrate(&mp3->header);
}
return 0;
}
int get_first_header(mp3info *mp3, long startpos)
{
int k, l=0,c;
mp3header h, h2;
long valid_start=0;
fseek(mp3->file,startpos,SEEK_SET);
while(1)
{
while((c=fgetc(mp3->file)) != 255 && (c != EOF)) {}
if(c == 255)
{
ungetc(c,mp3->file);
valid_start=ftell(mp3->file);
if((l=get_header(mp3->file,&h)))
{
fseek(mp3->file,l-FRAME_HEADER_SIZE,SEEK_CUR);
for(k=1; (k < MIN_CONSEC_GOOD_FRAMES) && (mp3->datasize-ftell(mp3->file) >= FRAME_HEADER_SIZE); k++)
{
if(!(l=get_header(mp3->file,&h2))) break;
if(!sameConstant(&h,&h2)) break;
fseek(mp3->file,l-FRAME_HEADER_SIZE,SEEK_CUR);
}
if(k == MIN_CONSEC_GOOD_FRAMES)
{
fseek(mp3->file,valid_start,SEEK_SET);
memcpy(&(mp3->header), &h2, sizeof(mp3header));
mp3->header_isvalid = 1;
return 1;
}
}
} else {
return 0;
}
}
return 0;
}
// Get next MP3 frame header.
// Return codes:
// positive value = Frame Length of this header
// 0 = No, we did not retrieve a valid frame header
int get_header(FILE *file,mp3header *header)
{
unsigned char buffer[FRAME_HEADER_SIZE];
int fl;
if(fread(&buffer,FRAME_HEADER_SIZE,1,file)<1)
{
header->sync=0;
return 0;
}
header->sync=(((int)buffer[0]<<4) | ((int)(buffer[1]&0xE0)>>4));
if(buffer[1] & 0x10) header->version=(buffer[1] >> 3) & 1;
else header->version=2;
header->layer=(buffer[1] >> 1) & 3;
if((header->sync != 0xFFE) || (header->layer != 1))
{
header->sync=0;
return 0;
}
header->crc=buffer[1] & 1;
header->bitrate=(buffer[2] >> 4) & 0x0F;
header->freq=(buffer[2] >> 2) & 0x3;
header->padding=(buffer[2] >>1) & 0x1;
header->extension=(buffer[2]) & 0x1;
header->mode=(buffer[3] >> 6) & 0x3;
header->mode_extension=(buffer[3] >> 4) & 0x3;
header->copyright=(buffer[3] >> 3) & 0x1;
header->original=(buffer[3] >> 2) & 0x1;
header->emphasis=(buffer[3]) & 0x3;
return ((fl=frame_length(header)) >= MIN_FRAME_SIZE ? fl : 0);
}
int frame_length(mp3header *header)
{
return header->sync == 0xFFE ?
(frame_size_index[3-header->layer]*((header->version&1)+1)*
header_bitrate(header)/header_frequency(header))+
header->padding : 1;
}
int header_layer(mp3header *h)
{
return layer_tab[h->layer];
}
int header_bitrate(mp3header *h)
{
if(h->bitrate > 0)
return bitrate[h->version & 1][3-h->layer][h->bitrate-1];
else
return -1; // unknown
}
int header_frequency(mp3header *h)
{
return frequencies[h->version][h->freq];
}
const char *header_emphasis(mp3header *h)
{
return emphasis_text[h->emphasis];
}
const char *header_mode(mp3header *h)
{
return mode_text[h->mode];
}
int header_channels(mp3header * h)
{
return h->mode == 3 ? 1 : 2;
}
int header_crc(mp3header *h)
{
return (!h->crc);
}
int sameConstant(mp3header *h1, mp3header *h2)
{
if((*(uint*)h1) == (*(uint*)h2)) return 1;
if((h1->version == h2->version ) &&
(h1->layer == h2->layer ) &&
(h1->crc == h2->crc ) &&
(h1->freq == h2->freq ) &&
(h1->mode == h2->mode ) &&
(h1->copyright == h2->copyright ) &&
(h1->original == h2->original ) &&
(h1->emphasis == h2->emphasis ))
return 1;
else return 0;
}
int get_id3(mp3info *mp3)
{
// this will read ID3v1 tags
int retcode=0;
char fbuf[4];
if(mp3->datasize >= 128)
{
if(fseek(mp3->file, -128, SEEK_END ))
{
retcode |= 4;
} else {
fread(fbuf,1,3,mp3->file); fbuf[3] = '\0';
mp3->id3.genre[0]=255;
if(!strcmp((const char *)"TAG",(const char *)fbuf))
{
mp3->id3_isvalid=1;
mp3->datasize -= 128;
fseek(mp3->file, -125, SEEK_END);
fread(mp3->id3.title,1,30,mp3->file); mp3->id3.title[30] = '\0';
fread(mp3->id3.artist,1,30,mp3->file); mp3->id3.artist[30] = '\0';
fread(mp3->id3.album,1,30,mp3->file); mp3->id3.album[30] = '\0';
fread(mp3->id3.year,1,4,mp3->file); mp3->id3.year[4] = '\0';
fread(mp3->id3.comment,1,30,mp3->file); mp3->id3.comment[30] = '\0';
if(mp3->id3.comment[28] == '\0')
{
mp3->id3.track[0] = mp3->id3.comment[29];
}
fread(mp3->id3.genre,1,1,mp3->file);
unpad(mp3->id3.title);
unpad(mp3->id3.artist);
unpad(mp3->id3.album);
unpad(mp3->id3.year);
unpad(mp3->id3.comment);
}
}
}
return retcode;
}
char *pad(char *string, int length)
{
int l;
l=strlen(string);
while(l<length)
{
string[l] = ' ';
l++;
}
string[l]='\0';
return string;
}
// Remove trailing whitespace from the end of a string
char *unpad(char *string)
{
char *pos=string+strlen(string)-1;
while(isspace(pos[0])) (pos--)[0]=0;
return string;
}
bool scan_mp3_file(QString& ,mp3info * i)
{
//memset(i,0,sizeof(mp3info));
resetmp3infoStruct(i);
i->filename = "text";
i->file = fopen(QTextCodec::codecForLocale()->fromUnicode(i->filename).data(),"rb");
if(!i->file)return false;
get_mp3_info(i);
fclose(i->file);
return (i->id3_isvalid);
}
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