आप यह जानकारी AudioToolbox.framework
के माध्यम से प्राप्त कर सकते हैं। AudioToolbox.framework
एक सी एपीआई है, तो मैं इसके लिए एक ऑब्जेक्टिव-सी आवरण लिखा है:
ID3Tag ज:
@interface ID3Tag : NSObject <NSCoding> {
NSString* title_;
NSString* album_;
NSString* artist_;
NSNumber* trackNumber_;
NSNumber* totalTracks_;
NSString* genre_;
NSString* year_;
NSNumber* approxDuration_;
NSString* composer_;
NSString* tempo_;
NSString* keySignature_;
NSString* timeSignature_;
NSString* lyricist_;
NSString* recordedDate_;
NSString* comments_;
NSString* copyright_;
NSString* sourceEncoder_;
NSString* encodingApplication_;
NSString* bitRate_;
NSStream* sourceBitRate_;
NSString* channelLayout_;
NSString* isrc_;
NSString* subtitle_;
}
@property (nonatomic, retain) NSString *title;
@property (nonatomic, retain) NSString *album;
@property (nonatomic, retain) NSString *artist;
@property (nonatomic, retain) NSNumber *trackNumber;
@property (nonatomic, retain) NSNumber *totalTracks;
@property (nonatomic, retain) NSString *genre;
@property (nonatomic, retain) NSString *year;
@property (nonatomic, retain) NSNumber *approxDuration;
@property (nonatomic, retain) NSString *composer;
@property (nonatomic, retain) NSString *tempo;
@property (nonatomic, retain) NSString *keySignature;
@property (nonatomic, retain) NSString *timeSignature;
@property (nonatomic, retain) NSString *lyricist;
@property (nonatomic, retain) NSString *recordedDate;
@property (nonatomic, retain) NSString *comments;
@property (nonatomic, retain) NSString *copyright;
@property (nonatomic, retain) NSString *sourceEncoder;
@property (nonatomic, retain) NSString *encodingApplication;
@property (nonatomic, retain) NSString *bitRate;
@property (nonatomic, retain) NSStream *sourceBitRate;
@property (nonatomic, retain) NSString *channelLayout;
@property (nonatomic, retain) NSString *isrc;
@property (nonatomic, retain) NSString *subtitle;
@end
ID3TagParser.h
#import <Foundation/Foundation.h>
#import "ID3Tag.h"
@interface ID3Parser : NSObject {
}
- (ID3Tag*) parseAudioFileForID3Tag:(NSURL*) url;
@end
ID3TagParser.m
#import "ID3Parser.h"
#import <AudioToolbox/AudioToolbox.h>
@implementation ID3Parser
- (ID3Tag*) parseAudioFileForID3Tag:(NSURL*) url {
if (url == nil) {
return nil;
}
AudioFileID fileID = nil;
OSStatus err = noErr;
err = AudioFileOpenURL((CFURLRef) url, kAudioFileReadPermission, 0, &fileID);
if(err != noErr) {
NSLog(@"AudioFileOpenURL failed");
return nil;
} else {
UInt32 id3DataSize = 0;
char* rawID3Tag = NULL;
// Reads in the raw ID3 tag info
err = AudioFileGetPropertyInfo(fileID, kAudioFilePropertyID3Tag, &id3DataSize, NULL);
if(err != noErr) {
return nil;
}
// Allocate the raw tag data
rawID3Tag = (char *) malloc(id3DataSize);
if(rawID3Tag == NULL) {
return nil;
}
err = AudioFileGetProperty(fileID, kAudioFilePropertyID3Tag, &id3DataSize, rawID3Tag);
if(err != noErr) {
return nil;
}
UInt32 id3TagSize = 0;
UInt32 id3TagSizeLength = 0;
err = AudioFormatGetProperty(kAudioFormatProperty_ID3TagSize, id3DataSize, rawID3Tag, &id3TagSizeLength, &id3TagSize);
if(err != noErr) {
switch(err) {
case kAudioFormatUnspecifiedError:
NSLog(@"err: audio format unspecified error");
return nil;
case kAudioFormatUnsupportedPropertyError:
NSLog(@"err: audio format unsupported property error");
return nil;
case kAudioFormatBadPropertySizeError:
NSLog(@"err: audio format bad property size error");
return nil;
case kAudioFormatBadSpecifierSizeError:
NSLog(@"err: audio format bad specifier size error");
return nil;
case kAudioFormatUnsupportedDataFormatError:
NSLog(@"err: audio format unsupported data format error");
return nil;
case kAudioFormatUnknownFormatError:
NSLog(@"err: audio format unknown format error");
return nil;
default:
NSLog(@"err: some other audio format error");
return nil;
}
}
CFDictionaryRef piDict = nil;
UInt32 piDataSize = sizeof(piDict);
// Populates a CFDictionary with the ID3 tag properties
err = AudioFileGetProperty(fileID, kAudioFilePropertyInfoDictionary, &piDataSize, &piDict);
if(err != noErr) {
NSLog(@"AudioFileGetProperty failed for property info dictionary");
return nil;
}
// Toll free bridge the CFDictionary so that we can interact with it via objc
NSDictionary* nsDict = (NSDictionary*)piDict;
ID3Tag* tag = [[[ID3Tag alloc] init] autorelease];
tag.album = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Album]];
tag.approxDuration = [NSNumber numberWithInt:[[nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_ApproximateDurationInSeconds]] intValue]];
tag.artist = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Artist]];
tag.bitRate = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_NominalBitRate]];
tag.channelLayout = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_ChannelLayout]];
tag.comments = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Comments]];
tag.composer = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Composer]];
tag.copyright = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Copyright]];
tag.encodingApplication = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_EncodingApplication]];
tag.genre = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Genre]];
tag.isrc = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_ISRC]];
tag.keySignature = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_KeySignature]];
tag.lyricist = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Lyricist]];
tag.recordedDate = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_RecordedDate]];
tag.sourceBitRate = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_SourceBitDepth]];
tag.sourceEncoder = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_SourceEncoder]];
tag.subtitle = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_SubTitle]];
tag.tempo = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Tempo]];
tag.timeSignature = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_TimeSignature]];
tag.title = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Title]];
tag.year = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_Year]];
/*
* We're going to parse tracks differently so that we can perform queries on the data. This means we need to look
* for a '/' so that we can seperate out the track from the total tracks on the source compilation (if it's there).
*/
NSString* tracks = [nsDict objectForKey:[NSString stringWithUTF8String: kAFInfoDictionary_TrackNumber]];
int slashLocation = [tracks rangeOfString:@"/"].location;
if (slashLocation == NSNotFound) {
tag.trackNumber = [NSNumber numberWithInt:[tracks intValue]];
} else {
tag.trackNumber = [NSNumber numberWithInt:[[tracks substringToIndex:slashLocation] intValue]];
tag.totalTracks = [NSNumber numberWithInt:[[tracks substringFromIndex:(slashLocation+1 < [tracks length] ? slashLocation+1 : 0)] intValue]];
}
// ALWAYS CLEAN UP!
CFRelease(piDict);
nsDict = nil;
free(rawID3Tag);
return tag;
}
}
@end
नाइस कोड:
हालांकि, वहाँ एक और टैग को पढ़ने कुंजी है, जो अलग-अलग परिणाम वापस आ जाएगी (अन्य कुंजी के साथ) है! आप बस कुछ मेमोरी क्लीनअप भूल गए हैं (सबसे महत्वपूर्ण रूप से 'AudioFileClose')। मैंने फाइलों के समूह पर कोड चलाया, आम तौर पर स्मृति समस्याएं कोई समस्या नहीं होतीं। – newenglander
मैं ट्रैक की सभी जानकारी प्राप्त करने में सक्षम हूं। लेकिन गीत प्राप्त करने में सक्षम नहीं हो सका ... तो गीत के बारे में कोई विचार ... –
कोड के लिए धन्यवाद। – Vignesh