138 lines
4.7 KiB
C
138 lines
4.7 KiB
C
/*==========================================================================
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*
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* Copyright (C) 1995-1996 Microsoft Corporation. All Rights Reserved.
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*
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* File: midstuff.h
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* Content: MIDI structures and definitions used by the MSTREAM sample
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* application in converting a MID file to a MIDI stream for
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* playback using the midiStream API.
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*
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***************************************************************************/
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#ifndef __MIDSTUFF_H__
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#define __MIDSTUFF_H__
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// MIDI file constants
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//
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#define MThd 0x6468544D // Start of file
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#define MTrk 0x6B72544D // Start of track
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#define MIDI_SYSEX ((BYTE)0xF0) // SysEx begin
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#define MIDI_SYSEXEND ((BYTE)0xF7) // SysEx begin
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#define MIDI_META ((BYTE)0xFF) // Meta event begin
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#define MIDI_META_TEMPO ((BYTE)0x51) // Tempo change
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#define MIDI_META_EOT ((BYTE)0x2F) // End-of-track
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#define MIDI_NOTEOFF ((BYTE)0x80) // + note + velocity
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#define MIDI_NOTEON ((BYTE)0x90) // + note + velocity
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#define MIDI_POLYPRESS ((BYTE)0xA0) // + pressure (2 bytes)
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#define MIDI_CTRLCHANGE ((BYTE)0xB0) // + ctrlr + value
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#define MIDI_PRGMCHANGE ((BYTE)0xC0) // + new patch
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#define MIDI_CHANPRESS ((BYTE)0xD0) // + pressure (1 byte)
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#define MIDI_PITCHBEND ((BYTE)0xE0) // + pitch bend (2 bytes)
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#define NUM_CHANNELS 16
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#define MIDICTRL_VOLUME ((BYTE)0x07)
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#define MIDICTRL_VOLUME_LSB ((BYTE)0x27)
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#define MIDICTRL_PAN ((BYTE)0x0A)
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#define MIDIEVENT_CHANNEL(dw) (dw & 0x0000000F)
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#define MIDIEVENT_TYPE(dw) (dw & 0x000000F0)
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#define MIDIEVENT_DATA1(dw) ((dw & 0x0000FF00) >> 8)
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#define MIDIEVENT_VOLUME(dw) ((dw & 0x007F0000) >> 16)
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// Macros for swapping hi/lo-endian data
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//
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#define WORDSWAP(w) (((w) >> 8) | \
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(((w) << 8) & 0xFF00))
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#define DWORDSWAP(dw) (((dw) >> 24) | \
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(((dw) >> 8) & 0x0000FF00) | \
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(((dw) << 8) & 0x00FF0000) | \
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(((dw) << 24) & 0xFF000000))
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// In debug builds, TRACKERR will show us where the parser died
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//
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#ifdef DEBUG
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#define TRACKERR(p,sz) ShowTrackError(p,sz);
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#else
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#define TRACKERR(p,sz)
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#endif
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// Make a little distinction here so the various structure members are a bit
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// more clearly labelled -- we have offsets and byte counts to keep track of
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// that deal with both in-memory buffers and the file on disk
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#define FILEOFF DWORD
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// These structures are stored in MIDI files; they need to be byte aligned.
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//
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#pragma pack(1)
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// Chunk header. dwTag is either MTrk or MThd.
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//
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typedef struct
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{
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DWORD dwTag; // Type
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DWORD dwChunkLength; // Length (hi-lo)
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} MIDICHUNK;
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// Contents of MThd chunk.
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typedef struct
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{
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WORD wFormat; // Format (hi-lo)
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WORD wTrackCount; // # tracks (hi-lo)
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WORD wTimeDivision; // Time division (hi-lo)
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} MIDIFILEHDR;
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#pragma pack() // End of need for byte-aligned structures
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// Temporary event structure which stores event data until we're ready to
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// dump it into a stream buffer
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//
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typedef struct
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{
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DWORD tkEvent; // Absolute time of event
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BYTE byShortData[4]; // Event type and parameters if channel msg
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DWORD dwEventLength; // Length of data which follows if meta or sysex
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LPBYTE pLongData; // -> Event data if applicable
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} TEMPEVENT, *PTEMPEVENT;
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#define ITS_F_ENDOFTRK 0x00000001
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// Description of a track open for read
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//
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typedef struct
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{
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DWORD fdwTrack; // Track status
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DWORD dwTrackLength; // Total bytes in track
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DWORD dwLeftInBuffer; // Bytes left unread in track buffer
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LPBYTE pTrackStart; // -> start of track data buffer
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LPBYTE pTrackCurrent; // -> next byte to read in buffer
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DWORD tkNextEventDue; // Absolute time of next event in track
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BYTE byRunningStatus;// Running status from last channel msg
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FILEOFF foTrackStart; // Start of track -- used for walking the file
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FILEOFF foNextReadStart;// File offset of next read from disk
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DWORD dwLeftOnDisk; // Bytes left unread on disk
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#ifdef DEBUG
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DWORD nTrack; // # of this track for debugging
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#endif
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} INTRACKSTATE, *PINTRACKSTATE;
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// Description of the input MIDI file
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//
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typedef struct
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{
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DWORD cbFileLength; // Total bytes in file
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DWORD dwTimeDivision; // Original time division
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DWORD dwFormat; // Original format
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DWORD dwTrackCount; // Track count (specifies pitsTracks size)
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INTRACKSTATE *pitsTracks; // -> array of tracks in this file
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} INFILESTATE, *PINFILESTATE;
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#endif
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