DRCoreTrack.h

Overview

Track object interfaces for Disc Recording.

Functions

DRTrackCreate

Creates a new track object.

DRTrackEstimateLength

Asks the track producer for a block size estimate.

DRTrackGetProperties

Returns the properties of the track.

DRTrackGetTypeID

Returns the Core Foundation type identifier of all DRTrack instances.

DRTrackSetProperties

Sets the properties of the track.

DRTrackSpeedTest

Tests the speed at which data can be produced.

Creates a new track object.

extern DRTrackRef DRTrackCreate(
    CFDictionaryRef properties,
    DRTrackCallbackProc callback) ;  

Parameters

properties

A CFDictionary object containing the track properties. If this parameter is not a valid CFDictionary object the behavior is undefined.

callback

A pointer to a DRTrackCallbackProc callback. If this callback is NULL the behavior is undefined.

Return Value

A reference to the new DRTrack object.

Availability

Introduced in Mac OS X v10.2

Asks the track producer for a block size estimate.

extern UInt64 DRTrackEstimateLength(
    DRTrackRef track) ;  

Parameters

track

The track to query.

Return Value

The size of the track in blocks.

Discussion

This function calls the track producer to ask it to estimate the block size needed for its data. This call is passed through to the DRTrackCallbackProc track production callback as kDRTrackMessageEstimateLength .

For some types of tracks, this call may be very expensive. For example, a file system track (DRFilesystemTrack ) may need to iterate through folders on disk to provide an accurate estimate. If a large number of files and folders are involved, this call may take 30 seconds or more. Since your main thread should not block for this long, you may wish to call this function on a separate thread.

The return value is the size in blocks that is specified in the track's properties dictionary.

Availability

Introduced in Mac OS X v10.3.

Returns the properties of the track.

extern CFDictionaryRef DRTrackGetProperties(
    DRTrackRef track) ;  

Parameters

track

The track whose properties will be retrieved. If this parameter is not a valid DRTrack object, the behavior is undefined.

Return Value

A CFMutableDictionary object containing the track properties.

Availability

Introduced in Mac OS X v10.2

Returns the Core Foundation type identifier of all DRTrack instances.

extern CFTypeID DRTrackGetTypeID(
    void) ;  

Availability

Introduced in Mac OS X v10.2

Sets the properties of the track.

extern void DRTrackSetProperties(
    DRTrackRef track,
    CFDictionaryRef properties) ;  

Parameters

track

The track whose properties will be set. If this parameter is not a valid DRTrack object, the behavior is undefined.

properties

A CFDictionary object containing the track properties. If this parameter is not a valid CFDictionary object the behavior is undefined.

Availability

Introduced in Mac OS X v10.2

Tests the speed at which data can be produced.

extern float DRTrackSpeedTest(
    DRTrackRef track,
    UInt32 howManyMilliseconds,
    UInt32 howManyBytes) ;  

Parameters

track

The track to test.

howManyMilliseconds

The maximum duration for the test production cycle. The test may not run for the full requested duration if the byte limit is reached first. If this parameter is 0, the result is undefined.

howManyBytes

The maximum number of bytes of data the client should produce before completing the test. The test may not produce the requested number of bytes if the time limit is reached first. If this parameter is 0, the result is undefined.

Return Value

The maximum throughput obtained during the test cycle.

Discussion

Runs a test track-production cycle, calling the produceData callback for the specified number of milliseconds or until the specified number of bytes have been produced, whichever comes first.

Use this function to verify that the produceData callback can produce data fast enough to satisfy the data throughput requirements of the burn.

This function will automatically set a value for the kDRMaxBurnSpeedKey key in the track's properties dictionary, with a value equal to the return result.

Availability

Introduced in Mac OS X v10.2

Constants

extern const CFStringRef kDRAudioFourChannelKey;  

Discussion

Optional key. For CD-DA audio tracks only. This track property key corresponds to a CFBoolean value indicating whether the track data has four channels, as opposed to the two channels of normal stereo. If this key is not present, the engine will use a default value of false and standard two-channel stereo is assumed.

Four-channel audio is supported in the Red Book standard but never caught on. It is probably being replaced by SACD, so you probably shouldn't attempt to use it.

On the disc, this key corresponds to bit 3 of the control field in sub-channel Q.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRAudioPreEmphasisKey;  

Discussion

Optional key. For CD-DA audio tracks only. This track property key corresponds to a CFBoolean value indicating whether the track includes pre-emphasis of 50/15 microseconds. If this key is not present, the engine will use a default value of false. On the disc, this key corresponds to bit 0 of the control field in sub-channel Q.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRBlockSizeKey;  

Discussion

Required key. This key corresponds to a CFNumber object containing the size of each block of the track. Common values are defined in the Block Sizes enumeration.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRBlockTypeKey;  

Discussion

Required key. This key corresponds to a CFNumber object containing the type of each block of the track. Common values are defined in the Block Types enumeration.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRBufferZone1DataKey;  

Discussion

Optional key. This track property key corresponds to a CFData object containing the data to write to Buffer Zone 1 on drives which support it, such as the Pioneer DVR-S201. This data will be sent directly to the drive. If this key is not present, no Buffer Zone 1 data will be sent.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRBurnKey;  

Discussion

This key corresponds to the DRBurn object for which the PreBurn message applies.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRDataFormKey;  

Discussion

Required key. This key corresponds to a CFNumber object containing the data format of each block of the track. Common values are defined in the Data Forms enumeration.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRDVDCopyrightInfoKey;  

Discussion

Optional key. This track property key corresponds to a CFData object containing Multi-Media Command (MMC) copyright data. This data will be sent directly to the drive. If this key is not present, no copyright information will be sent.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRDVDTimestampKey;  

Discussion

Optional key. This track property key corresponds to a CFData object containing Multi-Media Command (MMC) timestamp data. This data will be sent directly to the drive. If this key is not present, no timestamp will be sent.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRFreeBlocksKey;  

Discussion

This key corresponds to a CFNumber object containing the length, in blocks, which is still available in a writable track.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRIndexPointsKey;  

Discussion

Optional key. For CD tracks only. This track property key corresponds to a CFArray object containing CFNumber objects describing index points within the track. Each index point is specified as a number of blocks, equivalent to frames, relative to the start of the track. There are 75 blocks in one second of CD audio. No more than 98 index points may be specified for a track.

Not all drives can write index points, and not all consumer CD players report or use them. If this key is present in any track and the drive cannot write index points, the burn will fail with a return value of kDRDeviceCantWriteIndexPointsErr .

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRMaxBurnSpeedKey;  

Discussion

Optional key. This track property key corresponds to a CFNumber object containing the maximum sustained rate at which your application will request data from the track callback, in units of kilobytes per second where 1 kilobyte = 1,000 bytes.

The value for kDRMaxBurnSpeedKey must be greater than the drive's minimum burn speed. It is usually safe to specify the appropriate flavor of 1x (kDRDeviceBurnSpeedCD1x or kDRDeviceBurnSpeedDVD1x ), but some drives cannot slow all the way down to 1x.

Given the capabilities of the drive, the bus, and the recordable disc, the burn speed used when writing a layout will generally be the highest data rate possible that is less than or equal to the value of kDRMaxBurnSpeedKey for every track, as well as less than or equal to the value of the kDRBurnRequestedSpeedKey key for the burn object.

When this key is not present, the requested maximum sustained data rate defaults to a value of infinity. In this case, the Disc Recording engine assumes that your track callback can produce data at any rate requested.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRNextWritableAddressKey;  

Discussion

This key corresponds to a CFNumber object containing the Logical Block Address (LBA) of the next writable address in the track. This key is not present in closed tracks.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRPreGapIsRequiredKey;  

Discussion

Optional key. This track property key corresponds to a CFBoolean object indicating whether the pregap listed for the track is required. If this key is not present, the track will behave as though the key were false.

If this key's value is set to true and the device does not support the exact pregap length, the burn will fail with a return value of .

If this key's value is set to false and the device does not support the suggested pregap length, the engine will choose an alternate pregap length.

Availability

Introduced in Mac OS X v10.4.

extern const CFStringRef kDRPreGapLengthKey;  

Discussion

Optional key. This track property key corresponds to a CFNumber object containing the length in blocks of empty space, or pregap, to be recorded before the track. If this key is not present the Disc Recording engine will assume a 2 second, or 150 block, pregap.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRSCMSCopyrightFree;  

Discussion

One value for the kDRSerialCopyManagementStateKey dictionary key. This value indicates that the track has no copying restrictions. Copies of this track should also be copyright free.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRSCMSCopyrightProtectedCopy;  

Discussion

One value for the kDRSerialCopyManagementStateKey dictionary key. This value indicates that the track is a first-generation copy of an original that was subject to copy protection. No further digital copying should be allowed.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRSCMSCopyrightProtectedOriginal;  

Discussion

One value for the kDRSerialCopyManagementStateKey dictionary key. This value indicates that the track is an original subject to copyright protection. Digital copying of this track should be allowed, but copies should be marked with appropriate Serial Copy Management System (SCMS) data.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRSerialCopyManagementStateKey;  

Discussion

Optional key. For CD tracks only. This track property key corresponds to a CFString value indicating the Serial Copy Management System (SCMS) state of the track. If this key is not present, no SCMS data is written.

Not all drives are capable of writing SCMS data. If this key is present in any track and the drive cannot write SCMS, the burn will fail with a return value of kDRDeviceCantWriteSCMSErr .

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRSessionFormatKey;  

Discussion

Required key. This key corresponds to a CFNumber object containing the session format of the track. Common values are defined in the Session Mode enumeration.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRSessionNumberKey;  

Discussion

This key corresponds to a CFNumber object containing the physical session number of a track.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRSubchannelDataFormKey;  

Discussion

The property whose value is the data mode of the subchannel data sent to the drive. If this key is not present, the track will default to a value of DRSubchannelDataFormNone and no subchannel information will be requested from the producer.

Subchannel data is returned from the producer in the same production method that produces normal user data. Normally a producer returns user data in chunks of DRBlockSizeKey size. When subchannel data is also produced, the producer is expected to return user data of DRBlockSizeKey in length with an additonal 96 bytes of subchannel data. Depending on the data form specified in this key, the format of this 96 bytes is either in raw or pack format. When subchannel data is requested from the producer, the DRFlagSubchannelDataRequested flag is set in the flags parameter of producePreGapForTrack:intoBuffer:length:atAddress:blockSize:ioFlags: or produceDataForTrack:intoBuffer:length:atAddress:blockSize:ioFlags: and blockSize is increased by 96 bytes.

Availability

Introduced in Mac OS X v10.5.

extern const CFStringRef kDRSubchannelDataFormNone;  

Discussion

A value for DRSubchannelDataFormKey indicating that the subchannel data will not be provided by the producer.

Availability

Introduced in Mac OS X v10.5.

extern const CFStringRef kDRSubchannelDataFormPack;  

Discussion

A value for DRSubchannelDataFormKey indicating that the producer will be asked to provide pack format subchannel data for the track. If this form is selected, the drive will perform P and Q parity calculations on each pack and interleave the packs before writing them to disc. This corresponds to a subchannel data form of 0xC0.

Availability

Introduced in Mac OS X v10.5.

extern const CFStringRef kDRSubchannelDataFormRaw;  

Discussion

A value for DRSubchannelDataFormKey indicating that the producer will be asked to provide raw format subchannel data for the track. If this form is selected, the producer must have performed P and Q parity calculations for each pack and done proper interleaving of the subchannel data. The drive will fill in the P-Q subchannel information and write the R-W subchannel data as is to the disc. This corresponds to a subchannel data form of 0x40.

Availability

Introduced in Mac OS X v10.5.

extern const CFStringRef kDRTrackIsEmptyKey;  

Discussion

This key corresponds to a CFBoolean object and indicates whether the track is empty.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackISRCKey;  

Discussion

Optional key. For CD-DA audio tracks only. This track property key corresponds to a CFData object containing exactly 12 bytes, which will be written to the disc as the International Standard Recording Code (ISRC). If this key is not present, no ISRC data is written.

The use of this value should conform to the specifications of the IFPI. See http://www.ifpi.org/isrc for details on the ISRC standard.

Not all drives can write ISRC data. If this key is present in any track and the drive cannot write ISRC data, the burn will fail with a return value of kDRDeviceCantWriteISRCErr .

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackLengthKey;  

Discussion

Required Key. This key corresponds to a CFNumber object containing the length of the track data in blocks.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRTrackModeKey;  

Discussion

Required key. This key corresponds to a CFNumber object containing the track mode of the track. Common values are defined in the Track Modes enumeration.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRTrackNumberKey;  

Discussion

This key corresponds to a CFNumber object containing the physical track number of a track.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackPacketSizeKey;  

Discussion

This key corresponds to a CFNumber object that contains the number of blocks per packet for the disc. It will only be present if the disc contains fixed packets. This key will contain '16' for DVD media, and typically contains either '16' or '32' for CD media.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackPacketTypeFixed;  

Discussion

One value for the kDRTrackPacketTypeKey dictionary key. This value indicates the disc is writen with fixed sized packets. When this value is present the kDRPacketSizeKey dictionary key will also be present.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackPacketTypeKey;  

Discussion

This key corresponds to a CFString value indicating the kind of packets being written.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackPacketTypeVariable;  

Discussion

One value for the kDRTrackPacketTypeKey dictionary key. This value indicates the disc is written with sequential, variable-sized packets. When this key is present, the kDRPacketSizeKey dictionary key will not be.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackStartAddressKey;  

Discussion

This key corresponds to a CFNumber object containing the Logical Block Address (LBA) of the start address for the track.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackTypeClosed;  

Discussion

One value for the kDRTrackTypeKey dictionary key. This value indicates the track has been written and is closed.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackTypeIncomplete;  

Discussion

One value for the kDRTrackTypeKey dictionary key. This value indicates the track is not invisible or reserved and is available for writing.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackTypeInvisible;  

Discussion

One value for the kDRTrackTypeKey dictionary key. This value indicates the track is invisible and available for writing. If it is packet written and not closed, the kDRTrackPacketType key will be present along with the kDRTrackPacketSize keys.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackTypeKey;  

Discussion

This key corresponds to a CFString object indicating the type of track. Possible values are kDRTrackTypeInvisible , kDRTrackTypeIncomplete , kDRTrackTypeReserved , or kDRTrackTypeClosed .

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRTrackTypeReserved;  

Discussion

One value for the kDRTrackTypeKey dictionary key. This value indicates the track is reserved for writing.

Availability

Introduced in Mac OS X v10.3.

extern const CFStringRef kDRVerificationTypeChecksum;  

Discussion

One value for the kDRVerificationTypeKey dictionary key. This value indicates the engine will verify the track data with an internally calculated checksum.

Availability

Introduced in Mac OS X v10.4.

extern const CFStringRef kDRVerificationTypeKey;  

Discussion

Optional key. This track property key corresponds to a CFString object indicating the kind of verification that should be performed. If the key is not present, no verification will take place.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRVerificationTypeNone;  

Discussion

One value for the kDRVerificationTypeKey dictionary key. This value indicates the engine will not do any sort of verification on the track data.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRVerificationTypeProduceAgain;  

Discussion

One value for the kDRVerificationTypeKey dictionary key. This value indicates the engine will start another production cycle and the client simply produces data again from the start.

Note that this verification mode currently only works with data CDs and DVDs.

Availability

Introduced in Mac OS X v10.2

extern const CFStringRef kDRVerificationTypeReceiveData;  

Discussion

One value for the kDRVerificationTypeKey dictionary key. This value indicates the engine will read data from the disc and send it to the client through a series of calls to the callback.

Availability

Introduced in Mac OS X v10.2

Typedefs

Callback defined in the client to produce track data for recording.

typedef OSStatus ( *DRTrackCallbackProc)( 
    DRTrackRef track, 
    DRTrackMessage message, 
    void *ioParam);  

Parameters

track

The track with this callback is associated.

message

Indicates the type of data requested as one of the constants in the Track Messages enumeration.

ioParam

Parameters are message-specific.

Return Value

Error code. Your client application should return a value of kDRFunctionNotSupportedErr when a message is received that you don't respond to, and a value of noErr when the message is handled successfully. Any other error will cause the burn to immediately fail with the value you return as the error code.

Discussion

If your callback does not support a given function, it should return a value of kDRFunctionNotSupportedErr .

Messages sent to the DRTrackCallbackProc callback.

typedef UInt32 DRTrackMessage;  

typedef struct __DRTrack* DRTrackRef;  

Discussion

A reference to a DRTrack object.

Structs and Unions

Parmeter block used for data production.

struct DRTrackProductionInfo { 
    void *buffer; 
    UInt32 reqCount; 
    UInt32 actCount; 
    UInt32 flags; 
    UInt32 blockSize; 
    UInt64 requestedAddress; 
};  

Fields

buffer

In - The buffer to produce into. This buffer is passed into the track production callback and only the contents should be modified.

reqCount

In - The number of bytes requested by the engine.

actCount

Out - The number of bytes actually produced (between 0 and reqCount).

flags

InOut - Miscellaneous flags. Flags are passed into the track production callback callback from the Disc Recording engine and the callback can set flags to be passed back to the engine.

blockSize

In - The block size the engine is expecting. For best results, return multiples of this size.

requestedAddress

In - The byte address that the burn engine is requesting from the object (0-based). This increments when you send data, as one would expect.

Enumerations

enum { 
    kDRBlockSizeAudio = 2352, 
    kDRBlockSizeMode1Data = 2048, 
    kDRBlockSizeMode2Data = 2332, 
    kDRBlockSizeMode2Form1Data = 2048, 
    kDRBlockSizeMode2Form2Data = 2324, 
    kDRBlockSizeDVDData = 2048 
};  

Constants

kDRBlockSizeAudio

Audio data.

kDRBlockSizeMode1Data

Mode 1 data.

kDRBlockSizeMode2Data

Mode 2 data. Photo CD and CD-i use this.

kDRBlockSizeMode2Form1Data

Mode 2 Form 1 data.

kDRBlockSizeMode2Form2Data

Mode 2 Form 2 data.

kDRBlockSizeDVDData

DVD data.

Discussion

Common block sizes for different types of track data.

enum { 
    kDRBlockTypeAudio = 0, 
    kDRBlockTypeMode1Data = 8, 
    kDRBlockTypeMode2Data = 13, 
    kDRBlockTypeMode2Form1Data = 10, 
    kDRBlockTypeMode2Form2Data = 12, 
    kDRBlockTypeDVDData = 8 
};  

Constants

kDRBlockTypeAudio

Audio data.

kDRBlockTypeMode1Data

Mode 1 data.

kDRBlockTypeMode2Data

Mode 2 data. Photo CD and CD-i use this.

kDRBlockTypeMode2Form1Data

Mode 2 Form 1 data.

kDRBlockTypeMode2Form2Data

Mode 2 Form 2 data.

kDRBlockTypeDVDData

DVD data.

Discussion

Common block type values for types of track data.

enum { 
    kDRDataFormAudio = 0, 
    kDRDataFormMode1Data = 16, 
    kDRDataFormMode2Data = 32, 
    kDRDataFormMode2Form1Data = 32, 
    kDRDataFormMode2Form2Data = 32, 
    kDRDataFormDVDData = 16 
};  

Constants

kDRDataFormAudio

Audio data.

kDRDataFormMode1Data

Mode 1 data.

kDRDataFormMode2Data

Mode 2 data. Photo CD and CD-i use this.

kDRDataFormMode2Form1Data

Mode 2 Form 1 data.

kDRDataFormMode2Form2Data

Mode 2 Form 2 data.

kDRDataFormDVDData

DVD data.

Discussion

Common data form values for types of track data.

enum { 
    kDRSessionFormatAudio = 0, 
    kDRSessionFormatMode1Data = 0, 
    kDRSessionFormatCDI = 0x10, 
    kDRSessionFormatCDXA = 0x20, 
    kDRSessionFormatDVDData = 0 
};  

Constants

kDRSessionFormatAudio

Audio data.

kDRSessionFormatMode1Data

Mode 1 data.

kDRSessionFormatCDI

CD-I disc.

kDRSessionFormatCDXA

CD-ROM XA disc.

kDRSessionFormatDVDData

DVD data.

Discussion

Common session format values for types of track data.

enum { 
    #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5 
    kDRFlagSubchannelDataRequested = (
        1 << 1), 
    #endif  
    kDRFlagNoMoreData = (
        1 << 0) 
};  

Constants

kDRFlagNoMoreData

Indicates the end of variable length data.

kDRFlagSubchannelDataRequested

Indicates that the blockSize passed in includes room for subchannel data. Data producers should check this flag and perform subchannel data production in addition to user data production. Each block requested from the producer in this case will be formatted as

[user data (as specified in track properties)][subchannel data(96 bytes)].

For example an audio producer callback should produce 2352 bytes of audio data into bytes 0-2351 of the block and an additional 96 bytes of subchannel data into bytes 2352-2447.

Discussion

These flags are options in the DRTrackProductionInfo structure.

enum { 
    kDRTrackMessagePreBurn = 'pre ', 
    kDRTrackMessageProduceData = 'prod', 
    kDRTrackMessageVerificationStarting = 'vstr', 
    kDRTrackMessageVerifyData = 'vrfy', 
    kDRTrackMessageVerificationDone = 'vdon', 
    kDRTrackMessagePostBurn = 'post', 
    kDRTrackMessageEstimateLength = 'esti', /* added in 10.3 */
    kDRTrackMessageProducePreGap = 'prpr', /* added in 10.3 */
    kDRTrackMessageVerifyPreGap = 'vrpr' /* added in 10.4 */
};  

Constants

kDRTrackMessagePreBurn

Message sent to the track production callback indicating a burn is about to begin. Clients should open any files needed to produce data and get ready to start sending data.

The ioParam parameter contains a CFDictionary object with information about the burn. It currently holds kDRBurnKey and kDRDeviceMediaInfoKey dictionary keys, but may be extended to hold other properties in the future.

kDRTrackMessageProduceData

Message sent to the track production callback requesting that the client produce the next chunk of data for the track.

The ioParam parameter is a pointer to a DRTrackProductionInfo structure.

kDRTrackMessageVerificationStarting

Message sent to the callback proc indicating that verification is about to begin.

ioParam is not used and is NULL.

kDRTrackMessageVerifyData

Message sent to the track production callback when the client has chosen the kDRVerificationTypeReceiveData option.

The ioParam parameter is a pointer to a DRTrackProductionInfo structure describing the data passed to the callback.

kDRTrackMessageVerificationDone

Message sent to the track production callback when verification is complete.

The ioParam parameter is not used and is NULL.

kDRTrackMessagePostBurn

Message sent to the track production callback indicating a burn has completed.

The ioParam parameter is not used and is NULL.

kDRTrackMessageEstimateLength

Message sent to the track production callback asking it to estimate the length of the track. This message is sent outside of a burn cycle, when the DRTrackEstimateLength function is called.

The ioParam parameter is a pointer to a UInt64 value, which the callback fills in with an estimated number of blocks for the track. The estimate should be reasonably accurate and no smaller than the actual size that will be needed.

kDRTrackMessageProducePreGap

Message sent to the track production callback requesting that the client produce the next chunk of the pregap.

The ioParam parameter is a pointer to a DRTrackProductionInfo structure.

kDRTrackMessageVerifyPreGap

Message sent to the track production callback when the client has chosen the kDRVerificationTypeReceiveData option. The data produced by the client for the kDRTrackMessageProducePreGap should be verified.

The ioParam parameter is a pointer to a DRTrackProductionInfo structure describing the data passed to the callback.

Discussion

Messages sent to the DRTrackCallbackProc callback during a burn.

enum { 
    kDRTrackModeAudio = 0, 
    kDRTrackMode1Data = 4, 
    kDRTrackMode2Data = 4, 
    kDRTrackMode2Form1Data = 4, 
    kDRTrackMode2Form2Data = 4, 
    kDRTrackModeDVDData = 5 
};  

Constants

kDRTrackModeAudio

Audio data.

kDRTrackMode1Data

Mode 1 data.

kDRTrackMode2Data

Mode 2 data. Photo CD and CD-i use this.

kDRTrackMode2Form1Data

Mode 2 Form 1 data.

kDRTrackMode2Form2Data

Mode 2 Form 2 data.

kDRTrackModeDVDData

DVD data.

Discussion

Common track mode values for types of track data.

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Last Updated: 2008-04-01