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MIDIOUTCAPS

The MIDIOUTCAPS structure describes the capabilities of a MIDI output device.

typedef struct {

WORD wMid;

WORD wPid;

MMVERSION vDriverVersion;

CHAR szPname[MAXPNAMELEN];

WORD wTechnology;

WORD wVoices;

WORD wNotes;

WORD wChannelMask;

DWORD dwSupport;

} MIDIOUTCAPS;

Members

wMid

Manufacturer identifier of the device driver for the MIDI output device. Manufacturer identifiers are defined in Manufacturer and Product Identifiers.

wPid

Product identifier of the MIDI output device. Product identifiers are defined in Manufacturer and Product Identifiers.

  • DriverVersion

Version number of the device driver for the MIDI output device. The high-order byte is the major version number, and the low-order byte is the minor version number.

szPname

Product name in a null-terminated string.

wTechnology

Flags describing the type of the MIDI output device. It can be one of the following:

MOD_FMSYNTH

The device is an FM synthesizer.

MOD_MAPPER

The device is the Microsoft MIDI mapper.

MOD_MIDIPORT

The device is a MIDI hardware port.

MOD_SQSYNTH

The device is a square wave synthesizer.

MOD_SYNTH

The device is a synthesizer.

wVoices

Number of voices supported by an internal synthesizer device. If the device is a port, this member is not meaningful and is set to 0.

wNotes

Maximum number of simultaneous notes that can be played by an internal synthesizer device. If the device is a port, this member is not meaningful and is set to 0.

wChannelMask

Channels that an internal synthesizer device responds to, where the least significant bit refers to channel 0 and the most significant bit to channel 15. Port devices that transmit on all channels set this member to 0xFFFF.

dwSupport

Optional functionality supported by the device. It can be one or more of the following:

MIDICAPS_CACHE

Supports patch caching.

MIDICAPS_LRVOLUME

Supports separate left and right volume control.

MIDICAPS_STREAM

Provides direct support for the midiStreamOut function.

MIDICAPS_VOLUME

Supports volume control.

If a device supports volume changes, the MIDICAPS_VOLUME flag will be set for the dwSupport member. If a device supports separate volume changes on the left and right channels, both the MIDICAPS_VOLUME and the MIDICAPS_LRVOLUME flags will be set for this member.

See Also

midiStreamOut


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