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