Source code of Windows XP (NT5)
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/*
* Copyright (c) 1992-1994 Microsoft Corporation */
/*
* declaration of interface functions to the OPL3 midi device type. * * These functions are called from midi.c when the kernel driver * has decreed that this is an opl3-compatible device. * * Geraint Davies, Dec 92 */
/*
* Opl3_NoteOn - This turns a note on. (Including drums, with * a patch # of the drum Note + 128) * * inputs * BYTE bPatch - MIDI patch number * BYTE bNote - MIDI note number * BYTE bChannel - MIDI channel # * BYTE bVelocity - Velocity # * short iBend - current pitch bend from -32768, to 32767 * returns * none */VOID NEAR PASCAL Opl3_NoteOn (BYTE bPatch, BYTE bNote, BYTE bChannel, BYTE bVelocity, short iBend);
/* Opl3_NoteOff - This turns a note off. (Including drums,
* with a patch # of the drum note + 128) * * inputs * BYTE bPatch - MIDI patch # * BYTE bNote - MIDI note number * BYTE bChannel - MIDI channel # * returns * none */VOID FAR PASCAL Opl3_NoteOff (BYTE bPatch, BYTE bNote, BYTE bChannel);
/* Opl3_AllNotesOff - turn off all notes
* * inputs - none * returns - none */VOID Opl3_AllNotesOff(void);
VOID Opl3_ChannelNotesOff(BYTE bChannel);
/* Opl3_NewVolume - This should be called if a volume level
* has changed. This will adjust the levels of all the playing * voices. * * inputs * WORD wLeft - left attenuation (1.5 db units) * WORD wRight - right attenuation (ignore if mono) * returns * none */VOID FAR PASCAL Opl3_NewVolume (WORD wLeft, WORD wRight);
/* Opl3_ChannelVolume - set the volume level for an individual channel.
* * inputs * BYTE bChannel - channel number to change * WORD wAtten - attenuation in 1.5 db units * * returns * none */VOID FAR PASCAL Opl3_ChannelVolume(BYTE bChannel, WORD wAtten);
/* Opl3_SetPan - set the left-right pan position.
* * inputs * BYTE bChannel - channel number to alter * BYTE bPan - 0 for left, 127 for right or somewhere in the middle. * * returns - none */VOID FAR PASCAL Opl3_SetPan(BYTE bChannel, BYTE bPan);
/* Opl3_PitchBend - This pitch bends a channel.
* * inputs * BYTE bChannel - channel * short iBend - Values from -32768 to 32767, being * -2 to +2 half steps * returns * none */VOID NEAR PASCAL Opl3_PitchBend (BYTE bChannel, short iBend);
/* Opl3_BoardInit - initialise board and load patches as necessary.
* * inputs - none * returns - 0 for success or the error code */WORD Opl3_BoardInit(void);
/*
* Opl3_BoardReset - silence the board and set all voices off. */VOID Opl3_BoardReset(void);
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