106 lines
2.2 KiB
C++
106 lines
2.2 KiB
C++
/* Copyright (c) Microsoft Corporation.
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Licensed under the MIT License. */
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/* Copyright (c) Microsoft Corporation.
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Licensed under the MIT License. */
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/***************************************************************************
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Author: ShonK
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Project: Kauai
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Copyright (c) Microsoft Corporation
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Midi playback class.
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***************************************************************************/
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#ifndef MIDI_H
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#define MIDI_H
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typedef class MIDS *PMIDS;
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// midi event
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struct MIDEV
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{
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ulong ts; // time stamp of this event
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long cb; // number of bytes to send (in rgbSend)
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long lwTempo; // the current tempo - at a tempo change, cb will be 0
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union
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{
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byte rgbSend[4]; // bytes to send if pvLong is nil
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long lwSend; // for convenience
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};
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};
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typedef MIDEV *PMIDEV;
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/***************************************************************************
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Midi stream parser. Knows how to parse standard MIDI streams.
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***************************************************************************/
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typedef class MSTP *PMSTP;
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#define MSTP_PAR BASE
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#define kclsMSTP 'MSTP'
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class MSTP : public MSTP_PAR
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{
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RTCLASS_DEC
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NOCOPY(MSTP)
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ASSERT
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MARKMEM
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protected:
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ulong _tsCur;
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long _lwTempo;
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byte *_prgb;
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byte *_pbLim;
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byte *_pbCur;
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byte _bStatus;
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Debug( long _cactLongLock; )
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PMIDS _pmids;
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bool _FReadVar(byte **ppbCur, long *plw);
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public:
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MSTP(void);
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~MSTP(void);
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void Init(PMIDS pmids, ulong tsStart = 0, long lwTempo = 500000);
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bool FGetEvent(PMIDEV pmidev, bool fAdvance = fTrue);
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};
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/***************************************************************************
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Midi Stream object - this is like a MTrk chunk in a standard MIDI file,
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with timing in milliseconds.
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***************************************************************************/
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#define MIDS_PAR BACO
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#define kclsMIDS 'MIDS'
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class MIDS : public MIDS_PAR
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{
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RTCLASS_DEC
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ASSERT
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MARKMEM
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protected:
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HQ _hqrgb;
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friend MSTP;
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MIDS(void);
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static long _CbEncodeLu(ulong lu, byte *prgb);
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public:
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static bool FReadMids(PCRF pcrf, CTG ctg, CNO cno, PBLCK pblck,
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PBACO *ppbaco, long *pcb);
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static PMIDS PmidsRead(PBLCK pblck);
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static PMIDS PmidsReadNative(FNI *pfni);
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~MIDS(void);
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virtual bool FWrite(PBLCK pblck);
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virtual long CbOnFile(void);
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};
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#endif //!MIDI_H
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