123 lines
2.5 KiB
C
123 lines
2.5 KiB
C
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/*
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* Copyright (c) 1992-1994 Microsoft Corporation
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*/
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/*
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* declaration of interface functions to the OPL3 midi device type.
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*
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* These functions are called from midi.c when the kernel driver
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* has decreed that this is an opl3-compatible device.
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*
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* Geraint Davies, Dec 92
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*/
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/*
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* Opl3_NoteOn - This turns a note on. (Including drums, with
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* a patch # of the drum Note + 128)
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*
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* inputs
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* BYTE bPatch - MIDI patch number
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* BYTE bNote - MIDI note number
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* BYTE bChannel - MIDI channel #
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* BYTE bVelocity - Velocity #
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* short iBend - current pitch bend from -32768, to 32767
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* returns
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* none
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*/
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VOID NEAR PASCAL Opl3_NoteOn (BYTE bPatch,
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BYTE bNote, BYTE bChannel, BYTE bVelocity,
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short iBend);
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/* Opl3_NoteOff - This turns a note off. (Including drums,
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* with a patch # of the drum note + 128)
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*
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* inputs
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* BYTE bPatch - MIDI patch #
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* BYTE bNote - MIDI note number
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* BYTE bChannel - MIDI channel #
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* returns
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* none
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*/
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VOID FAR PASCAL Opl3_NoteOff (BYTE bPatch,
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BYTE bNote, BYTE bChannel);
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/* Opl3_AllNotesOff - turn off all notes
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*
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* inputs - none
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* returns - none
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*/
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VOID Opl3_AllNotesOff(void);
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VOID Opl3_ChannelNotesOff(BYTE bChannel);
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/* Opl3_NewVolume - This should be called if a volume level
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* has changed. This will adjust the levels of all the playing
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* voices.
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*
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* inputs
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* WORD wLeft - left attenuation (1.5 db units)
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* WORD wRight - right attenuation (ignore if mono)
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* returns
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* none
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*/
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VOID FAR PASCAL Opl3_NewVolume (WORD wLeft, WORD wRight);
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/* Opl3_ChannelVolume - set the volume level for an individual channel.
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*
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* inputs
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* BYTE bChannel - channel number to change
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* WORD wAtten - attenuation in 1.5 db units
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*
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* returns
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* none
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*/
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VOID FAR PASCAL Opl3_ChannelVolume(BYTE bChannel, WORD wAtten);
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/* Opl3_SetPan - set the left-right pan position.
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*
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* inputs
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* BYTE bChannel - channel number to alter
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* BYTE bPan - 0 for left, 127 for right or somewhere in the middle.
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*
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* returns - none
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*/
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VOID FAR PASCAL Opl3_SetPan(BYTE bChannel, BYTE bPan);
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/* Opl3_PitchBend - This pitch bends a channel.
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*
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* inputs
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* BYTE bChannel - channel
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* short iBend - Values from -32768 to 32767, being
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* -2 to +2 half steps
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* returns
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* none
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*/
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VOID NEAR PASCAL Opl3_PitchBend (BYTE bChannel, short iBend);
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/* Opl3_BoardInit - initialise board and load patches as necessary.
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*
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* inputs - none
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* returns - 0 for success or the error code
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*/
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WORD Opl3_BoardInit(void);
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/*
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* Opl3_BoardReset - silence the board and set all voices off.
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*/
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VOID Opl3_BoardReset(void);
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