MIDIOUTCAPS

Article
12/10/2007

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

typedef struct { 
    WORD      wMid; 
    WORD      wPid; 
    MMVERSION vDriverVersion; 
    TCHAR     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.

vDriverVersion

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

Type of the MIDI output device. This value can be one of the following:

Value	Device type
MOD_MIDIPORT	MIDI hardware port.
MOD_SYNTH	Synthesizer.
MOD_SQSYNTH	Square wave synthesizer.
MOD_FMSYNTH	FM synthesizer.
MOD_MAPPER	Microsoft MIDI mapper.
MOD_WAVETABLE	Hardware wavetable synthesizer.
MOD_SWSYNTH	Software 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.

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Mmsystem.h; include Windows.h.
**  Unicode:** Declared as Unicode and ANSI structures.

MIDIOUTCAPS

Additional resources