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ADC Home > Reference Library > Reference > Audio > Carbon > Disc Recording Framework Reference
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DRCDTextBlock |
| Inherits from: | |
| Declared In: |
Defines a CD-Text block, which holds the CD-Text strings for the entire disc in one language.
arrayOfCDTextBlocksFromPacks: |
Parses raw CD-Text data from a disc into DRCDTextBlock objects.
+ (NSArray*) arrayOfCDTextBlocksFromPacks:(NSData*)packs;
packsAn autoreleased array of DRCDTextBlock objects describing the information in the raw PACKs, or nil if the data could not be parsed.
This method can be used to parse any data blob containing CD-Text PACKs,
such as the result of +[DRDevice readCDText], or the data returned by the
IOKit ioctl DKIOCCDREADTOC with format=5.
The NSData should be sized to fit the exact number of PACKs. Each PACK
occupies 18 bytes, and the 4-byte header from a READ TOC command may
optionally be included.
cdTextBlockWithLanguage:encoding: |
Creates a CD-Text block.
+ (DRCDTextBlock*) cdTextBlockWithLanguage:(NSString*)lang encoding:(NSStringEncoding)enc;
langencAn autoreleased DRCDTextBlock object.
flatten |
Flattens the CD-Text block to determine whether any information will be truncated.
- (NSUInteger) flatten;
The number of bytes that will be truncated from the CD-Text block. If this method returns 0, no truncation will occur.
When burning your CD-Text information to a CD, DiscRecording will automatically
truncate some of the information you've specified if it does not fit.
The size limit for CD-Text is approximately 3K of strings per block. This limit
is only approximate because some of this space is taken up as overhead, and
duplicate strings can sometimes be combined. The only way to tell for sure
how big your CD-Text block is going to be is to ask DiscRecording to try
flattening it. You can use this function to determine whether truncation
will be needed.
Some clients will want to accept DiscRecording's truncation since it preserves
the most important information and provides the simplest user experience. If
you do not wish to use DiscRecording's automatic truncation, it is your
responsibility to make sure that you specify a CD-Text block that will fit.
Following is a simple algorithm to avoid having your CD-Text data truncated:
initWithLanguage:encoding: |
Initializes an empty CD-Text block.
- (id) initWithLanguage:(NSString*)lang encoding:(NSStringEncoding)enc;
langencA DRCDTextBlock object.
objectForKey:ofTrack: |
Returns a single value from the block.
- (id) objectForKey:(NSString*)key ofTrack:(NSUInteger)trackIndex;
keytrackIndexAutoreleased NSObject for the key, or nil if not present.
properties |
Returns the properties dictionary of the CD-Text block.
- (NSDictionary*) properties;
An NSDictionary containing the properties of the block.
setObject:forKey:ofTrack: |
Changes a single string in the block.
- (void) setObject:(id)value forKey:(NSString*)key ofTrack:(NSUInteger)trackIndex;
valuekeytrackIndexsetProperties: |
Sets the properties dictionary of the CD-Text block.
- (void) setProperties:(NSDictionary*)properties;
propertiessetTrackDictionaries: |
Sets the array of track dictionaries for the block.
- (void) setTrackDictionaries:(NSArray*)tracks;
tracksEach item in the array is a dictionary, which in turn holds key-value encoded
information about the track/disc. Array index 0 holds information about the
disc, index 1 holds information about track 1, index 2 holds information about
track 2, etc.
Any incoming strings are automatically modified to conform to the character
set specified in the language block. Calling -trackDictionaries immediately
after -setTrackDictionaries: will provide the modified values. These
may not be the same as the ones you passed in, but instead correspond to
what will actually be used.
trackDictionaries |
Returns a copy of the array of track dictionaries for the block.
- (NSArray*) trackDictionaries;
An autoreleased NSArray of CFDictionaries of CFStrings, containing the CD-Text information.
Each item in the array is a dictionary, which in turn holds key-value encoded information about the track/disc. Array index 0 holds information about the disc, index 1 holds information about track 1, index 2 holds information about track 2, etc.
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