MIDIOUTCAPS structure

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

Syntax

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:

  Name	Description
  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:

  Name	Description
  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

See also

Musical Instrument Digital Interface (MIDI)

MIDI Structures

midiStreamOut