MCI_SET

Sets device information. Support of this message by a device is optional. The parameters and flags for this message vary according to the selected device.

Returns zero if successful. Otherwise, it returns an MCI error code.

DWORD lParam1

The following flags apply to all devices supporting MCI_SET:

MCI_NOTIFY	Specifies that MCI should post the MM_MCINOTIFY message when this command completes. The window to receive this message is specified in the dwCallback member of the structure identified by lpSet.
MCI_WAIT	Specifies that the set operation should finish before MCI returns control to the application.
MCI_SET_AUDIO	Specifies an audio channel number is included in the dwAudio member of the structure identified by lpSet. This flag must be used with MCI_SET_ON or MCI_SET_OFF. Use one of the following constants to indicate the channel number:

MCI_SET_AUDIO_ALL	Specifies all audio channels.
MCI_SET_AUDIO_LEFT	Specifies the left channel.
MCI_SET_AUDIO_RIGHT	Specifies the right channel.

MCI_SET_DOOR_CLOSED	Instructs the device to close the media cover (if any).
MCI_SET_DOOR_OPEN	Instructs the device to open the media cover (if any).
MCI_SET_TIME_FORMAT	Specifies a time format parameter is included in the dwTimeFormat member of the structure identified by lpSet. Specifying MCI_FORMAT_MILLISECONDS indicates that subsequent commands that specify time will use milliseconds for both input and output. Other units are device dependent.
MCI_SET_VIDEO	Sets the video signal on or off. This flag must be used with either MCI_SET_ON or MCI_SET_OFF. Devices that do not have video return MCIERR_UNSUPPORTED_FUNCTION.
MCI_SET_ON	Enables the specified video or audio channel.
MCI_SET_OFF	Disables the specified video or audio channel.

LPMCI_SET_PARMS lParam2

Specifies a far pointer to the MCI_SET_PARMS structure. (Devices with extended command sets might replace this structure with a device-specific structure.)

Animation Extensions

The following additional flags for lParam1apply to animation devices:

MCI_SET_TIME_FORMAT

Specifies a time format parameter is included in the dwTimeFormat member of the structure identified by lParam2. The following constants are defined for the time format:

MCI_FORMAT_MILLISECONDS	Changes the time format to milliseconds.
MCI_FORMAT_FRAMES	Changes the time format to frames.

Note that lParam2 specifies a far pointer to the MCI_SET_PARMS structure.

CD Audio Extensions

The following additional flags for lParam1 apply to videodisc devices:

MCI_SET_TIME_FORMAT

Specifies a time format parameter is included in the dwTimeFormat member of the structure identified by lParam2. The following constants are defined for the time format:

MCI_FORMAT_MILLISECONDS	Changes the time format to milliseconds.
MCI_FORMAT_MSF	Changes the time format to minutes, seconds, and frames.
MCI_FORMAT_TMSF	Changes the time format to tracks, minutes, seconds, and frames. (MCI uses continuous track numbers.)

Note that lParam2 specifies a far pointer to the MCI_SET_PARMS structure.

MIDI Sequencer Extensions

The following additional flags for lParam1 apply to MIDI sequencer devices:

MCI_SEQ_SET_MASTER

Sets the sequencer as a source of synchronization data and indicates that the type of synchronization is specified in the dwMaster member of the structure identified by lParam2. MCISEQ returns MCIERR_UNSUPPORTED_FUNCTION. The following constants are defined for the synchronization type:

MCI_SEQ_MIDI	The sequencer will send MIDI format synchronization data.
MCI_SEQ_SMPTE	The sequencer will send SMPTE format synchronization data.
MCI_SEQ_NONE	The sequencer will not send synchronization data.
MCI_SEQ_SET_OFFSET	Changes the SMPTE offset of a sequence to that specified by the dwOffset member of the structure identified by lParam2. This only affects sequences with a SMPTE division type.
MCI_SEQ_SET_PORT	Sets the output MIDI port of a sequence to that specified by the MIDI device ID in the dwPort member of the structure identified by lParam2. The device will close the previous port (if any), and attempt to open and use the new port. If it fails, it will return an error and re-open the previously used port (if any). The following constants are defined for the ports:
MCI_SEQ_NONE	Closes the previously used port (if any). The sequencer will behave exactly the same as if a port were open, except no MIDI message will be sent.

MIDI_MAPPER	Sets the port opened to the MIDI Mapper.
MCI_SEQ_SET_SLAVE	Sets the sequencer to receive synchronization data and indicates that the type of synchronization is specified in the dwSlave member of the structure identified by lParam2.MCISEQ returns MCIERR_UNSUPPORTED_FUNCTION.The following constants are defined for the synchronization type:
MCI_SEQ_FILE	Sets the sequencer to receive synchronization data contained in the MIDI file.
MCI_SEQ_SMPTE	Sets the sequencer to receive SMPTE synchronization data.
MCI_SEQ_MIDI	Sets the sequencer to receive MIDI synchronization data.
MCI_SEQ_NONE	Sets the sequencer to ignore synchronization data in a MIDI stream.
MCI_SEQ_SET_TEMPO	Changes the tempo of the MIDI sequence to that specified by the dwTempo member of the structure pointed to by lParam2. For sequences with division type PPQN, tempo is specified in beats per minute; for sequences with division type SMPTE, tempo is specified in frames per second.
MCI_SET_TIME_FORMAT	Specifies a time format parameter is included in the dwTimeFormat member of the structure identified by lParam2. The following constants are defined for the time format:

MCI_FORMAT_MILLISECONDS	Changes the time format to milliseconds for both input and output.
MCI_FORMAT_SMPTE_24	Sets the time format to 24 frame SMPTE.
MCI_FORMAT_SMPTE_25	Sets the time format to 25 frame SMPTE.
MCI_FORMAT_SMPTE_30	Sets the time format to 30 frame SMPTE.
MCI_FORMAT_SMPTE_30DROP	Sets the time format to 30 drop-frame SMPTE.
MCI_SEQ_FORMAT_SONGPTR	Sets the time format to song-pointer units.

Note that lParam2 specifies a far pointer to the MCI_SEQ_SET_PARMS structure.

Videodisc Extensions

The following additional flags for lParam1 apply to videodisc devices:

MCI_SET_TIME_FORMAT	Specifies a time format parameter is included in the dwTimeFormat member of the structure identified by lParam2. The following constants are defined for the time format:
MCI_FORMAT_CHAPTERS	Changes the time format to chapters.
MCI_FORMAT_FRAMES	Changes the time format to frames.
MCI_FORMAT_HMS	Changes the time format to hours, minutes, and seconds.
MCI_FORMAT_MILLISECONDS	Changes the time format to milliseconds for both input and output.
MCI_VD_FORMAT_TRACK	Changes the time format to tracks. MCI uses continuous track numbers.

Note that lParam2specifies a far pointer to the MCI_VD_SET_PARMS structure. (Devices with additional parameters might replace this structure with a device-specific structure.)

Waveform Audio Extensions

The following additional flags for lParam1 apply to waveform audio devices:

MCI_WAVE_INPUT	Sets the input used for recording to the wInput member of the structure identified by lParam2.
MCI_WAVE_OUTPUT	Sets the output used for playing to the wOutput member of the structure identified by lParam2.
MCI_WAVE_SET_ANYINPUT	Specifies that any wave input compatible with the current format can be used for recording.
MCI_WAVE_SET_ANYOUTPUT	Specifies that any wave output compatible with the current format can be used for playing.
MCI_WAVE_SET_AVGBYTESPERSEC	Sets the bytes per second used for playing, recording, and saving to the nAvgBytesPerSec member of the structure identified by lParam2.
MCI_WAVE_SET_BITSPERSAMPLE	Sets the bits per sample used for playing, recording, and saving to the nBitsPerSample member of the structure identified by lParam2.
MCI_WAVE_SET_BLOCKALIGN	Sets the block alignment used for playing, recording, and saving to the nBlockAlign member of the structure identified by lParam2.
MCI_WAVE_SET_CHANNELS	Specifies the number of channels is indicated in the nChannels member of the structure identified by lParam2.
MCI_WAVE_SET_FORMATTAG	Sets the format type used for playing, recording, and saving to the wFormatTag member of the structure identified by lParam2. Specifying WAVE_FORMAT_PCM changes the format to PCM.
MCI_WAVE_SET_SAMPLESPERSEC	Sets the samples per second used for playing, recording, and saving to the nSamplesPerSec member of the structure identified by lParam2.
MCI_SET_TIME_FORMAT	Specifies a time format parameter is included in the dwTimeFormat member of the structure identified by lParam2. The following constants are defined for the time format:

MCI_FORMAT_BYTES	Changes the time format to bytes for input or output.
MCI_FORMAT_MILLISECONDS	Changes the time format to milliseconds for input or output.
MCI_FORMAT_SAMPLES	Changes the time format to samples for input or output.

Note that lParam2specifies a far pointer to the MCI_WAVE_SET_PARMS structure. This parameter replaces the standard default parameter structure identified by lParam2.