cog/Plugins/TagLib/TagLibID3v2Reader.mm

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//
// TagLibID3v2Reader.m
// TagLib Plugin
//
// Created by Christopher Snowhill on 2/8/22.
//
#import "TagLibID3v2Reader.h"
#import <taglib/fileref.h>
#import <taglib/mpeg/id3v2/frames/attachedpictureframe.h>
#import <taglib/mpeg/id3v2/id3v2tag.h>
#import <taglib/mpeg/mpegfile.h>
#import <taglib/toolkit/tbytevectorstream.h>
@implementation TagLibID3v2Reader
+ (NSDictionary *)metadataForTag:(NSData *)tagBlock {
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
// if ( !*TagLib::ascii_encoding ) {
// NSStringEncoding enc = [NSString defaultCStringEncoding];
// CFStringEncoding cfenc = CFStringConvertNSStringEncodingToEncoding(enc);
// NSString *ref = (NSString *)CFStringConvertEncodingToIANACharSetName(cfenc);
// UInt32 cp = CFStringConvertEncodingToWindowsCodepage(cfenc);
//
// // Most tags are using windows codepage, so remap OS X codepage to Windows one.
//
// static struct {
// UInt32 from, to;
// } codepage_remaps[] = {
// { 10001, 932 }, // Japanese Shift-JIS
// { 10002, 950 }, // Traditional Chinese
// { 10003, 949 }, // Korean
// { 10004, 1256 }, // Arabic
// { 10005, 1255 }, // Hebrew
// { 10006, 1253 }, // Greek
// { 10007, 1251 }, // Cyrillic
// { 10008, 936 }, // Simplified Chinese
// { 10029, 1250 }, // Central European (latin2)
// };
//
// int i;
// int max = sizeof(codepage_remaps)/sizeof(codepage_remaps[0]);
// for ( i=0; i<max; i++ )
// if ( codepage_remaps[i].from == cp )
// break;
// if ( i < max )
// sprintf(TagLib::ascii_encoding, "windows-%d", codepage_remaps[i].to);
// else
// strcpy(TagLib::ascii_encoding, [ref UTF8String]);
//
// }
TagLib::ByteVector vector((const char *)[tagBlock bytes], (unsigned int)[tagBlock length]);
TagLib::ByteVectorStream vectorStream(vector);
TagLib::FileRef f(&vectorStream, false);
if(!f.isNull()) {
const TagLib::Tag *tag = f.tag();
if(tag) {
TagLib::String artist, albumartist, title, album, genre, comment;
int year, track, disc;
float rgAlbumGain, rgAlbumPeak, rgTrackGain, rgTrackPeak;
TagLib::String cuesheet;
TagLib::String soundcheck;
artist = tag->artist();
albumartist = tag->albumartist();
title = tag->title();
album = tag->album();
genre = tag->genre();
comment = tag->comment();
cuesheet = tag->cuesheet();
year = tag->year();
[dict setObject:[NSNumber numberWithInt:year] forKey:@"year"];
track = tag->track();
[dict setObject:[NSNumber numberWithInt:track] forKey:@"track"];
disc = tag->disc();
[dict setObject:[NSNumber numberWithInt:disc] forKey:@"disc"];
rgAlbumGain = tag->rgAlbumGain();
rgAlbumPeak = tag->rgAlbumPeak();
rgTrackGain = tag->rgTrackGain();
rgTrackPeak = tag->rgTrackPeak();
[dict setObject:[NSNumber numberWithFloat:rgAlbumGain] forKey:@"replayGainAlbumGain"];
[dict setObject:[NSNumber numberWithFloat:rgAlbumPeak] forKey:@"replayGainAlbumPeak"];
[dict setObject:[NSNumber numberWithFloat:rgTrackGain] forKey:@"replayGainTrackGain"];
[dict setObject:[NSNumber numberWithFloat:rgTrackPeak] forKey:@"replayGainTrackPeak"];
soundcheck = tag->soundcheck();
if(!soundcheck.isEmpty()) {
TagLib::StringList tag = soundcheck.split(" ");
TagLib::StringList wantedTag;
for(int i = 0, count = tag.size(); i < count; i++) {
if(tag[i].length() == 8)
wantedTag.append(tag[i]);
}
if(wantedTag.size() >= 10) {
float volume1 = -log10((double)((uint32_t)wantedTag[0].toInt(16)) / 1000) * 10;
float volume2 = -log10((double)((uint32_t)wantedTag[1].toInt(16)) / 1000) * 10;
float volumeToUse = MIN(volume1, volume2);
float volumeScale = pow(10, volumeToUse / 20);
[dict setObject:[NSNumber numberWithFloat:volumeScale] forKey:@"volume"];
}
}
if(!artist.isEmpty())
[dict setObject:[NSString stringWithUTF8String:artist.toCString(true)] forKey:@"artist"];
if(!albumartist.isEmpty())
[dict setObject:[NSString stringWithUTF8String:albumartist.toCString(true)] forKey:@"albumartist"];
if(!album.isEmpty())
[dict setObject:[NSString stringWithUTF8String:album.toCString(true)] forKey:@"album"];
if(!title.isEmpty())
[dict setObject:[NSString stringWithUTF8String:title.toCString(true)] forKey:@"title"];
if(!genre.isEmpty())
[dict setObject:[NSString stringWithUTF8String:genre.toCString(true)] forKey:@"genre"];
if(!cuesheet.isEmpty())
[dict setObject:[NSString stringWithUTF8String:cuesheet.toCString(true)] forKey:@"cuesheet"];
// Try to load the image.
NSData *image = nil;
TagLib::MPEG::File *mf = dynamic_cast<TagLib::MPEG::File *>(f.file());
if(mf) {
TagLib::ID3v2::FrameList pictures = mf->ID3v2Tag()->frameListMap()["APIC"];
if(!pictures.isEmpty()) {
TagLib::ID3v2::AttachedPictureFrame *pic = static_cast<TagLib::ID3v2::AttachedPictureFrame *>(pictures.front());
image = [NSData dataWithBytes:pic->picture().data() length:pic->picture().size()];
}
}
if(nil != image) {
[dict setObject:image forKey:@"albumArt"];
}
}
}
return [NSDictionary dictionaryWithDictionary:dict];
}
@end