Under the SMAF specification, Master Track data represents both sequences which describe music information and sequences which control SMAF playback itself. Of the various tracks which comprise a SMAF file, the Master Track differs from Score Tracks, PCM Tracks and Graphics Tracks in that it does not include support for any output device.

• Header
• Sequence Data Chunk

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The contents of the Header (which is required) are described below.

FormatType
Sequence Type
TimeBase_D
OptionSize
OptionData

FormatType

Defines the format of the Master Track data.

Sequence Type

Defines the stream sequences and sub-sequences.

TimeBase_D

Matches the TimeBase_D setting for the Duration standard time setting for the Score Track.

OptionSize

Specifies the size of OptionData, which is to be used for extensions.

OptionData

Describes the data to be used for future extensions.

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• Sequence Data Chunk
  Comprised of Duration, Event and EOS (End of Sequence) elements, this chunk is represented by a variable length byte stream. The first element is Duration, after which Duration and Event occur alternately. The Duration setting matches that of the Score Track and the Graphics Track.

Music Information Events

These are organized as described below.

Chord Name

Represents the chord name in terms of its root note (C~B), the appropriate sharp or flat symbol (# or b), and the chord type. Conforms to XF notation.

Key Signature

Denotes the key signature.

Time Signature

Denotes the time signature.

Tempo

Denotes the length of a beat in units of 1 microsecond.

Measure Mark

Denotes the position of the end of the bar.

Rehearsal Mark

Represents the XF format rehearsal mark.

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Outline of SMAF Specification