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// VGM file format definitions



#ifndef VGM_H

#define VGM_H



//#include <windows.h>



// VGM data bytes

#define VGM_GGST        0x4f

#define VGM_PSG         0x50

#define VGM_YM2413      0x51

#define VGM_YM2612_0    0x52

#define VGM_YM2612_1    0x53

#define VGM_YM2151      0x54

#define VGM_PAUSE_WORD  0x61

#define VGM_PAUSE_60TH  0x62

#define VGM_PAUSE_50TH  0x63

#define VGM_END         0x66

#define VGM_DATA_BLOCK  0x67

#define VGM_YM2612_PCM_SEEK 0xe0

// Also:

// 0x7n = pause n+1

// 0x8n = output YM2612 PCM byte and pause n



// Reserved VGM ranges (inclusive)

#define VGM_RESERVED_1_PARAM_BEGIN  0x30

#define VGM_RESERVED_1_PARAM_END    0x4e

#define VGM_RESERVED_2_PARAMS_BEGIN 0xa0

#define VGM_RESERVED_2_PARAMS_END   0xbf

#define VGM_RESERVED_3_PARAMS_BEGIN 0xc0

#define VGM_RESERVED_3_PARAMS_END   0xdf

#define VGM_RESERVED_4_PARAMS_BEGIN 0xe1

#define VGM_RESERVED_4_PARAMS_END   0xff



#define VGM_DATA_BLOCK_YM2612_PCM 0x00





#define VGMIDENT 0x206d6756 // "Vgm "



struct TVGMHeader {

  unsigned long VGMIdent;               // "Vgm "

  unsigned long EoFOffset;              // relative offset (from this point, 0x04) of the end of file

  unsigned long Version;                // 0x00000110 for 1.10

  unsigned long PSGClock;               // typically 3579545, 0 for no PSG

  unsigned long YM2413Clock;            // typically 3579545, 0 for no YM2413

  unsigned long GD3Offset;              // relative offset (from this point, 0x14) of the GD3 tag, 0 if not present

  unsigned long TotalLength;            // in samples

  unsigned long LoopOffset;             // relative again (to 0x1c), 0 if no loop

  unsigned long LoopLength;             // in samples, 0 if no loop

  unsigned long RecordingRate;          // in Hz, for speed-changing, 0 for no changing

  unsigned short PSGWhiteNoiseFeedback; // Feedback pattern for white noise generator; if <=v1.01, substitute default of 0x0009

  unsigned char PSGShiftRegisterWidth;  // Shift register width for noise channel; if <=v1.01, substitute default of 16

  unsigned char Reserved;

  unsigned long YM2612Clock;            // typically 3579545, 0 for no YM2612

  unsigned long YM2151Clock;            // typically 3579545, 0 for no YM2151

  unsigned long VGMDataOffset;          // if 0 assume 0x0c relative offset = 0x40 absolute

};



#define EOFDELTA  0x04

#define GD3DELTA  0x14

#define LOOPDELTA 0x1c

#define VGMDATADELTA 0x34



// Size of registers array for YM2413 - uses 0x00-0x38, with some gaps

#define YM2413NumRegs 0x39



// Size of registers array for YM2612 - uses 0x21-0xb7, with some gaps, twice (use high 1 for channel 1, high 0 for channel 0)

#define YM2612NumRegs 0x1b7



// Frequency value below which the PSG is silent

#define PSGCutoff 6



// Lengths of pauses in samples

#define LEN60TH 735

#define LEN50TH 882



enum chip_types

{

	VGM_CHIP_SN76489 = 0,

	VGM_CHIP_YM2413,

	VGM_CHIP_YM2612,

	VGM_CHIP_YM2151,

	VGM_CHIP_COUNT

};



#endif