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| VS1033 Datasheet, PDF (50/70 Pages) List of Unclassifed Manufacturers – MP3/AAC/WMA/MIDI AUDIO CODEC | |||
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VLSI
Solution y
VS1033a PRELIMINARY
VS1033A
9. OPERATION
9.9.4 WMA
Windows Media Audio (WMA) is enclosed as data packets into Advanced Systems Format (ASF) ï¬les.
This ï¬le format is not suitable for random-access.
However, it is also possible to implement fast forward and rewind for WMA ï¬les. The easiest way is to
use the resync ï¬eld (see Section 9.9.3), perfect fast forward and rewind can be implemented by using
the jumpPoints table and making seeks only on packet or data block boundaries.
9.9.5 Midi
Midi is not at all suitable for random-access. You can implement fast forward using the playSpeed
bits of the midiConfig ï¬eld to select 1-128à play speed. SCI DECODE TIME also speeds up.
If necessary, rewind can be implemented by restarting the decoding of a MIDI ï¬le and fast forwarding
to the appropriate place. SCI DECODE TIME can be used to decide when the right place has been
reached. This is best suited for soundless rewind.
Version 0.6, 2005-01-05
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