iOS audio file metadata

Subject: iOS audio file metadata
From: Brian Gerstle <email@hidden>
Date: Tue, 29 Mar 2011 18:34:37 -0400

Hello everyone,

I was wondering if anyone has experience reading & writing metadata to an audio file in iOS. So far we've tried:

AudioFileGet/SetProperty
kAudioFilePropertyInfoDictionary

kAFInfoDictionary_Comments

kAudioFilePropertyID3Tag

I'm getting the 'pty?' error code returned when I try to write to the info dictionary or read the ID3 tag. Also, the only "visible" key/value pair when I get the dictionary is the "approximate duration." I've attached some code to demonstrate how I'm trying to use these functions.

Thanks in advance!

Brian

P.S.

My colleague also posted to Apple's Core Audio support forum:

https://devforums.apple.com/message/409115#409115

{

NSURL* url = [ NSURL fileURLWithPath: path2 ];

OSStatus err;

AudioFileID fileID;

err = AudioFileOpenURL ((CFURLRef)url, kAudioFileReadWritePermission, kAudioFileWAVEType,&fileID );

if (err == noErr)

{

CFDictionaryRef fileDict = nil;

UInt32 size = sizeof(fileDict);

err = AudioFileGetProperty(fileID, kAudioFilePropertyInfoDictionary, &size, &fileDict);

if (err == noErr)

{

NSDictionary* dict = (NSDictionary*) fileDict;

NSLog(@"%@",dict);

NSMutableDictionary* dict2 = [ [ NSMutableDictionary alloc ] init ];

[ dict2 addEntriesFromDictionary:dict ];

[ dict2 setObject:@"test" forKey: [ NSString stringWithUTF8String:kAFInfoDictionary_Comments ] ];

err = AudioFileSetProperty(fileID, kAudioFilePropertyInfoDictionary, size, dict2);

if (err == noErr)

{

// this point isn't reached

NSLog(@"saved");

}

AudioFileClose(fileID);

}

...

{

UInt32 outDataSize = 0;
UInt32 isWritable = 0;

// 'pty?' error here
   err = AudioFileGetPropertyInfo(fileID,kAudioFilePropertyID3Tag,&outDataSize,&isWritable);

   NSLog(@"outDataSize %d isWritable %d",outDataSize,isWritable);

   unsigned char* id3data = malloc(outDataSize);

   err = AudioFileGetProperty(fileID, kAudioFilePropertyID3Tag, &outDataSize, id3data);

   err++;
}

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