Changing Sequencer Synchronization
To change the synchronization mode of a sequencer device, use the
MCI_SET command message with the MCI_SEQ_SET_MASTER and MCI_SEQ_SET_SLAVE flags. Two
members in the
MCI_SEQ_SET_PARMS structure,
dwMaster and
dwSlave, are used to specify the master and slave synchronization modes.
The master synchronization mode controls synchronization information sent by
the sequencer to an output port. The slave synchronization mode controls where
the sequencer gets its timing information to play a MIDI file. Following are the
constants for the
dwMaster member and their corresponding master synchronization modes.
Constant
| Synchronization mode
|
MCI_SEQ_MIDI
| MIDI Synchronization. Send timing information to output port using MIDI timing
clock messages.
|
MCI_SEQ_SMPTE
| SMPTE Synchronization. Send timing information to output port using MIDI
quarter-frame messages.
|
MCI_SEQ_NONE
| No Synchronization. Send no timing information.
|
Following are the constants for the
dwSlave member and their corresponding slave synchronization modes.
Constant
| Synchronization mode
|
MCI_SEQ_FILE
| File Synchronization. Get timing information from MIDI file.
|
MCI_SEQ_MIDI
| MIDI Synchronization. Get timing information from input port using MIDI timing
clock messages.
|
MCI_SEQ_SMPTE
| SMPTE Synchronization. Get timing information from input port using MIDI
quarter-frame messages.
|
MCI_SEQ_NONE
| No Synchronization. Get timing information from MCI commands only and ignore
timing information (such as tempo changes) that are in the MIDI file.
|
Note Currently, for master synchronization, the MCI MIDI sequencer supports only
the No Synchronization mode (MCI_SEQ_NONE). For slave synchronization, it
supports only the File Synchronization mode (MCI_SEQ_FILE) and the No
Synchronization mode (MCI_SEQ_NONE).
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