BRELS_MIDI_HEADER

typedef struct
{
	DWORD dwMagic;
	DWORD dwSize;
	WORD  wFormat;
	WORD  wTracks;
	WORD  wBeatSize;
} BRELS_MIDI_HEADER, *LPBRELS_MIDI_HEADER;

This is the MIDI header as found in a MIDI file. The header is the first 14 bytes of any MIDI file.

Members

• dwMagic: "magic" number which identifies MIDI files. It is always 0x4D546864 (MThd)
• dwSize: size of the rest of the header. It is always 0x00000006.
• wFormat: format of the file. Format zero is a single-track file; format 1 is a multi-track file where all of them start at the same time; format 2 is a multi-track file with assynchronous tracks (assynchronous tracks are not supported by the API).
• wTracks: number of tracks in the file.
• wBeatSize: number of ticks in a quarter note (a beat). This applies to the entire sequence

Remarks

Due to the difference between the storage method of the file and its memory representation, the byte order of values in each member of the structure is reversed. Use btlw and btldw to correct them:

Example

void CorrectMidiHeader(LPBRELS_MIDI_HEADER lpbmh)
{
	lpbmh->dwMagic = btldw(lpbmh->dwMagic);
	lpbmh->dwSize = btldw(lpbmh->dwSize);
	lpbmh->wFormat = btlw(lpbmh->wFormat);
	lpbmh->wTracks = btlw(lpbmh->wTracks);
	lpbmh->wBeatSize = btlw(lpbmh->wBeatSize);
};

Further information

Released in November 19th, 2003
Updated in April 29th, 2004
Property of Breno de Lima Sarmento
Home page: http://www27.brinkster.com/brels
E-mail: [email protected]
ICQ: 78977999 ()