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MtcQuarterFrame

oximedia_timecode::midi_timecode

Struct MtcQuarterFrame 

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pub struct MtcQuarterFrame;
Expand description

MTC quarter-frame message utilities.

MTC is transmitted as 8 quarter-frame messages per timecode frame. Each message carries 4 bits of timecode data.

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impl MtcQuarterFrame

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pub fn encode_quarter(tc: &MtcTimecode, piece: u8) -> u8

Encode one of the 8 quarter-frame pieces.

Each quarter-frame message is a 2-byte sequence: [0xF1, data] where data is ppppdddd (piece number in high nibble, data in low).

The 8 pieces (0-7) carry:

  • 0: frames low nibble
  • 1: frames high nibble (2 bits)
  • 2: seconds low nibble
  • 3: seconds high nibble (3 bits)
  • 4: minutes low nibble
  • 5: minutes high nibble (3 bits)
  • 6: hours low nibble
  • 7: hours high nibble + rate code (3 bits)

Returns the data byte (the second byte of the 0xF1 message pair).

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