Microsoft DirectX 9.0

Performance Message Types

Messages are stored in various structures derived from DMUS_PMSG. Because the C programming language does not support inheritance, the members of DMUS_PMSG are included in the declaration for each message type as the DMUS_PMSG_PART macro. These members contain data common to all messages, including the type of the message, time stamps, the performance channel to which the message is directed, and what toolgraph and tool are next in line to process the message. The other members contain data unique to the message type.

The following standard message structures are defined.

Structure Content
DMUS_PMSG Simple message with no additional parameters.
DMUS_CHANNEL_PRIORITY_PMSG Channel priority change. See Channels.
DMUS_MIDI_PMSG Any MIDI message that does not have a unique message type—for example, a control change.
DMUS_NOTE_PMSG Music note. MIDI note-on and note-off messages are combined in this structure, which specifies the duration of the note.
DMUS_NOTIFICATION_PMSG Notification. See Notification and Event Handling.
DMUS_PATCH_PMSG MIDI patch change.
DMUS_SYSEX_PMSG MIDI system exclusive message.
DMUS_TEMPO_PMSG Tempo change.
DMUS_TIMESIG_PMSG Time signature change.
DMUS_WAVE_PMSG Waveform playback.