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MIDIOUTCAPS structure

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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

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

 Mmsystem.h (include Windows.h)

See also

Musical Instrument Digital Interface (MIDI)

MIDI Structures

midiStreamOut