MIDSTUFF.H

/*========================================================================== 
 * 
 *  Copyright (C) 1995-1997 Microsoft Corporation. All Rights Reserved. 
 * 
 *  File:midstuff.h 
 *  Content:MIDI structures and definitions used by the MSTREAM sample 
 *              application in converting a MID file to a MIDI stream for 
 *              playback using the midiStream API. 
 * 
 ***************************************************************************/ 
#ifndef __MIDSTUFF_H__ 
#define __MIDSTUFF_H__ 
 
// MIDI file constants 
// 
#define MThd0x6468544D// Start of file 
#define MTrk0x6B72544D// Start of track 
 
#define MIDI_SYSEX((BYTE)0xF0)// SysEx begin 
#define MIDI_SYSEXEND((BYTE)0xF7)// SysEx begin 
#define MIDI_META((BYTE)0xFF)// Meta event begin 
#define MIDI_META_TEMPO((BYTE)0x51)// Tempo change 
#define MIDI_META_EOT((BYTE)0x2F)// End-of-track 
 
#define MIDI_NOTEOFF((BYTE)0x80)// + note + velocity 
#define MIDI_NOTEON((BYTE)0x90)// + note + velocity 
#define MIDI_POLYPRESS  ((BYTE)0xA0)// + pressure (2 bytes) 
#define MIDI_CTRLCHANGE ((BYTE)0xB0)// + ctrlr + value 
#define MIDI_PRGMCHANGE((BYTE)0xC0)// + new patch 
#define MIDI_CHANPRESS((BYTE)0xD0)// + pressure (1 byte) 
#define MIDI_PITCHBEND((BYTE)0xE0)// + pitch bend (2 bytes) 
 
#define NUM_CHANNELS16 
 
#define MIDICTRL_VOLUME((BYTE)0x07) 
#define MIDICTRL_VOLUME_LSB((BYTE)0x27) 
#define MIDICTRL_PAN((BYTE)0x0A) 
 
#define MIDIEVENT_CHANNEL(dw)(dw & 0x0000000F) 
#define MIDIEVENT_TYPE(dw)(dw & 0x000000F0) 
#define MIDIEVENT_DATA1(dw)((dw & 0x0000FF00) >> 8) 
#define MIDIEVENT_VOLUME(dw)((dw & 0x007F0000) >> 16) 
 
// Macros for swapping hi/lo-endian data 
// 
#define WORDSWAP(w)(((w) >> 8) | \ 
(((w) << 8) & 0xFF00)) 
 
#define DWORDSWAP(dw) (((dw) >> 24) |\ 
(((dw) >> 8) & 0x0000FF00) |\ 
(((dw) << 8) & 0x00FF0000) |\ 
(((dw) << 24) & 0xFF000000)) 
 
// In debug builds, TRACKERR will show us where the parser died 
// 
#ifdef DEBUG 
#define TRACKERR(p,sz) ShowTrackError(p,sz); 
#else 
#define TRACKERR(p,sz) 
#endif 
 
 
// Make a little distinction here so the various structure members are a bit 
// more clearly labelled -- we have offsets and byte counts to keep track of 
// that deal with both in-memory buffers and the file on disk 
 
#defineFILEOFFDWORD 
 
 
// These structures are stored in MIDI files; they need to be byte aligned. 
// 
#pragma pack(1) 
 
// Chunk header. dwTag is either MTrk or MThd. 
// 
typedef struct 
{ 
    DWORDdwTag;// Type 
    DWORDdwChunkLength;// Length (hi-lo) 
} MIDICHUNK; 
 
// Contents of MThd chunk. 
typedef struct 
{ 
    WORDwFormat;// Format (hi-lo) 
    WORDwTrackCount;// # tracks (hi-lo) 
    WORDwTimeDivision;// Time division (hi-lo) 
} MIDIFILEHDR; 
 
#pragma pack() // End of need for byte-aligned structures 
 
 
// Temporary event structure which stores event data until we're ready to 
// dump it into a stream buffer 
// 
typedef struct 
{ 
    DWORDtkEvent;// Absolute time of event 
    BYTEbyShortData[4];// Event type and parameters if channel msg 
    DWORDdwEventLength;// Length of data which follows if meta or sysex 
    LPBYTEpLongData;// -> Event data if applicable 
} TEMPEVENT, *PTEMPEVENT; 
 
#define ITS_F_ENDOFTRK0x00000001 
 
// Description of a track open for read 
// 
typedef struct 
{ 
    DWORDfdwTrack;// Track status 
    DWORDdwTrackLength;// Total bytes in track 
    DWORDdwLeftInBuffer;// Bytes left unread in track buffer 
    LPBYTEpTrackStart;// -> start of track data buffer 
    LPBYTEpTrackCurrent;// -> next byte to read in buffer 
    DWORDtkNextEventDue;// Absolute time of next event in track 
    BYTEbyRunningStatus;// Running status from last channel msg 
 
    FILEOFFfoTrackStart;// Start of track -- used for walking the file 
    FILEOFFfoNextReadStart;// File offset of next read from disk 
    DWORDdwLeftOnDisk;// Bytes left unread on disk 
#ifdef DEBUG 
    DWORDnTrack;// # of this track for debugging 
#endif 
} INTRACKSTATE, *PINTRACKSTATE; 
 
// Description of the input MIDI file 
// 
typedef struct 
{ 
    DWORDcbFileLength;// Total bytes in file 
    DWORDdwTimeDivision;// Original time division 
    DWORDdwFormat;// Original format 
    DWORDdwTrackCount;// Track count (specifies pitsTracks size) 
    INTRACKSTATE *pitsTracks;// -> array of tracks in this file 
} INFILESTATE, *PINFILESTATE; 
 
#endif