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optvgm32.c
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optvgm32.c
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// optvgm32.c - VGM PWM Optimizer
//
// TODO: Better gcd
#define EXTRA_SYNC
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "stdtype.h"
#include "stdbool.h"
#include "VGMFile.h"
#include "common.h"
static bool OpenVGMFile(const char* FileName);
static void WriteVGMFile(const char* FileName);
static void EnumeratePWMWrite(void);
static UINT32 gcd(UINT32 x, UINT32 y);
static void DataReducer(void);
static void MakeDataStream(void);
static void RewriteVGMData(void);
typedef struct vgm_data_write
{
UINT8 Port;
UINT16 Value;
UINT32 SmplPos;
} DATA_WRITE;
typedef struct vgm_data_stream
{
UINT8 Type;
UINT32 Length;
void* Data;
} DATA_STREAM;
typedef struct stream_control_command
{
UINT8 Command;
UINT8 StreamID;
UINT8 DataB1;
UINT8 DataB2;
UINT8 DataB3;
UINT16 DataS1;
UINT32 DataL1;
UINT32 DataL2;
} STRM_CTRL_CMD;
typedef struct pwm_channel
{
UINT8 Command;
UINT32 SmplStart;
UINT32 SmplEnd;
UINT32 SmplLoop;
UINT32 CmdCount;
UINT32 CmdEnd;
UINT32 CmdLoop;
UINT32 Frequency;
} PWM_CHN;
VGM_HEADER VGMHead;
UINT32 VGMDataLen;
UINT8* VGMData;
UINT32 VGMPos;
INT32 VGMSmplPos;
UINT8* DstData;
UINT32 DstDataLen;
char FileBase[0x100];
UINT32 DataSizeA;
UINT32 DataSizeB;
UINT32 WriteAlloc;
UINT32 WriteCount;
DATA_WRITE* VGMWrite;
DATA_STREAM VGMStream;
UINT32 CtrlCmdCount;
STRM_CTRL_CMD VGMCtrlCmd[0x10];
bool JustTimerCmds;
int main(int argc, char* argv[])
{
int argbase;
int ErrVal;
char FileName[0x100];
printf("VGM PWM Optimizer\n-----------------\n\n");
ErrVal = 0;
JustTimerCmds = false;
argbase = 1;
printf("File Name:\t");
if (argc <= argbase + 0)
{
ReadFilename(FileName, sizeof(FileName));
}
else
{
strcpy(FileName, argv[argbase + 0]);
printf("%s\n", FileName);
}
if (! strlen(FileName))
return 0;
if (! OpenVGMFile(FileName))
{
printf("Error opening the file!\n");
ErrVal = 1;
goto EndProgram;
}
printf("\n");
EnumeratePWMWrite();
DataReducer();
MakeDataStream();
free(VGMWrite); VGMWrite = NULL;
WriteAlloc = 0x00; WriteCount = 0x00;
RewriteVGMData();
if (DataSizeB < DataSizeA)
{
if (argc > argbase + 1)
strcpy(FileName, argv[argbase + 1]);
else
strcpy(FileName, "");
if (FileName[0] == '\0')
{
strcpy(FileName, FileBase);
strcat(FileName, "_optimized.vgm");
}
WriteVGMFile(FileName);
}
free(VGMData);
free(DstData);
EndProgram:
DblClickWait(argv[0]);
return ErrVal;
}
static bool OpenVGMFile(const char* FileName)
{
gzFile hFile;
UINT32 CurPos;
UINT32 TempLng;
char* TempPnt;
hFile = gzopen(FileName, "rb");
if (hFile == NULL)
return false;
gzseek(hFile, 0x00, SEEK_SET);
gzread(hFile, &TempLng, 0x04);
if (TempLng != FCC_VGM)
goto OpenErr;
gzseek(hFile, 0x00, SEEK_SET);
gzread(hFile, &VGMHead, sizeof(VGM_HEADER));
ZLIB_SEEKBUG_CHECK(VGMHead);
// Header preperations
if (VGMHead.lngVersion < 0x00000101)
{
VGMHead.lngRate = 0;
}
if (VGMHead.lngVersion < 0x00000110)
{
VGMHead.shtPSG_Feedback = 0x0000;
VGMHead.bytPSG_SRWidth = 0x00;
VGMHead.lngHzYM2612 = VGMHead.lngHzYM2413;
VGMHead.lngHzYM2151 = VGMHead.lngHzYM2413;
}
if (VGMHead.lngVersion < 0x00000150)
{
VGMHead.lngDataOffset = 0x00000000;
}
if (VGMHead.lngVersion < 0x00000151)
{
VGMHead.lngHzSPCM = 0x0000;
VGMHead.lngSPCMIntf = 0x00000000;
// all others are zeroed by memset
}
// relative -> absolute addresses
VGMHead.lngEOFOffset += 0x00000004;
if (VGMHead.lngGD3Offset)
VGMHead.lngGD3Offset += 0x00000014;
if (VGMHead.lngLoopOffset)
VGMHead.lngLoopOffset += 0x0000001C;
if (! VGMHead.lngDataOffset)
VGMHead.lngDataOffset = 0x0000000C;
VGMHead.lngDataOffset += 0x00000034;
CurPos = VGMHead.lngDataOffset;
if (VGMHead.lngVersion < 0x00000151)
CurPos = 0x40;
TempLng = sizeof(VGM_HEADER);
if (TempLng > CurPos)
TempLng -= CurPos;
else
TempLng = 0x00;
memset((UINT8*)&VGMHead + CurPos, 0x00, TempLng);
// Read Data
VGMDataLen = VGMHead.lngEOFOffset;
VGMData = (UINT8*)malloc(VGMDataLen);
if (VGMData == NULL)
goto OpenErr;
gzseek(hFile, 0x00, SEEK_SET);
gzread(hFile, VGMData, VGMDataLen);
gzclose(hFile);
strcpy(FileBase, FileName);
TempPnt = strrchr(FileBase, '.');
if (TempPnt != NULL)
*TempPnt = 0x00;
return true;
OpenErr:
gzclose(hFile);
return false;
}
static void WriteVGMFile(const char* FileName)
{
FILE* hFile;
hFile = fopen(FileName, "wb");
fwrite(DstData, 0x01, DstDataLen, hFile);
fclose(hFile);
printf("File written.\n");
return;
}
static void EnumeratePWMWrite(void)
{
UINT8 Command;
UINT8 TempByt;
UINT16 TempSht;
UINT32 TempLng;
#ifdef WIN32
UINT32 CmdTimer;
char TempStr[0x80];
char MinSecStr[0x80];
#endif
UINT32 CmdLen;
bool StopVGM;
bool FirstAfterLoop[0x03];
DATA_WRITE* TempWrt;
VGMPos = VGMHead.lngDataOffset;
VGMSmplPos = 0;
WriteAlloc = VGMHead.lngDataOffset / 8;
VGMWrite = (DATA_WRITE*)malloc(WriteAlloc * sizeof(DATA_WRITE));
WriteCount = 0x00;
#ifdef WIN32
CmdTimer = 0;
#endif
StopVGM = false;
for (TempByt = 0x00; TempByt < 0x03; TempByt ++)
FirstAfterLoop[TempByt] = false;
while(VGMPos < VGMHead.lngEOFOffset)
{
CmdLen = 0x00;
Command = VGMData[VGMPos + 0x00];
if (VGMPos == VGMHead.lngLoopOffset)
{
for (TempByt = 0x00; TempByt < 0x03; TempByt ++)
FirstAfterLoop[TempByt] = true;
}
if (Command >= 0x70 && Command <= 0x8F)
{
switch(Command & 0xF0)
{
case 0x70:
TempSht = (Command & 0x0F) + 0x01;
VGMSmplPos += TempSht;
break;
case 0x80:
TempSht = Command & 0x0F;
VGMSmplPos += TempSht;
break;
}
CmdLen = 0x01;
}
else
{
switch(Command)
{
case 0x66: // End Of File
CmdLen = 0x01;
StopVGM = true;
break;
case 0x62: // 1/60s delay
TempSht = 735;
VGMSmplPos += TempSht;
CmdLen = 0x01;
break;
case 0x63: // 1/50s delay
TempSht = 882;
VGMSmplPos += TempSht;
CmdLen = 0x01;
break;
case 0x61: // xx Sample Delay
memcpy(&TempSht, &VGMData[VGMPos + 0x01], 0x02);
VGMSmplPos += TempSht;
CmdLen = 0x03;
break;
case 0x50: // SN76496 write
CmdLen = 0x02;
break;
case 0xB2: // PWM write
TempByt = VGMData[VGMPos + 0x01] >> 4;
// Channel Write: 0x02 - Left, 0x03 - Right, 0x04 - Both
if (TempByt >= 0x02 && TempByt <= 0x04)
{
if (WriteAlloc < WriteCount + 0x01)
{
WriteAlloc += 0x1000;
VGMWrite = (DATA_WRITE*)realloc(VGMWrite,
WriteAlloc * sizeof(DATA_WRITE));
}
TempWrt = &VGMWrite[WriteCount];
WriteCount ++;
TempByt -= 0x02;
TempWrt->Port = TempByt;
if (FirstAfterLoop[TempByt])
{
TempWrt->Port |= 0x80;
FirstAfterLoop[TempByt] = false;
}
TempWrt->Value = ((VGMData[VGMPos + 0x01] & 0x0F) << 8) |
(VGMData[VGMPos + 0x02] << 0);
TempWrt->SmplPos = VGMSmplPos;
}
CmdLen = 0x03;
break;
case 0x67: // PCM Data Stream
TempByt = VGMData[VGMPos + 0x02];
memcpy(&TempLng, &VGMData[VGMPos + 0x03], 0x04);
TempLng &= 0x7FFFFFFF;
CmdLen = 0x07 + TempLng;
break;
case 0x90: // DAC Ctrl: Setup Chip
VGMPos += 0x05;
break;
case 0x91: // DAC Ctrl: Set Data
VGMPos += 0x05;
break;
case 0x92: // DAC Ctrl: Set Freq
VGMPos += 0x06;
break;
case 0x93: // DAC Ctrl: Play from Start Pos
VGMPos += 0x0B;
break;
case 0x94: // DAC Ctrl: Stop immediately
VGMPos += 0x02;
break;
case 0x95: // DAC Ctrl: Play Block (small)
VGMPos += 0x05;
break;
default: // Handle all other known and unknown commands
switch(Command & 0xF0)
{
case 0x30:
case 0x40:
CmdLen = 0x02;
break;
case 0x50:
case 0xA0:
case 0xB0:
CmdLen = 0x03;
break;
case 0xC0:
case 0xD0:
CmdLen = 0x04;
break;
case 0xE0:
case 0xF0:
CmdLen = 0x05;
break;
default:
printf("Unknown Command: %X\n", Command);
CmdLen = 0x01;
//StopVGM = true;
break;
}
break;
}
}
VGMPos += CmdLen;
if (StopVGM)
break;
#ifdef WIN32
if (CmdTimer < GetTickCount())
{
PrintMinSec(VGMSmplPos, MinSecStr);
PrintMinSec(VGMHead.lngTotalSamples, TempStr);
TempLng = VGMPos - VGMHead.lngDataOffset;
CmdLen = VGMHead.lngEOFOffset - VGMHead.lngDataOffset;
printf("%04.3f %% - %s / %s (%08X / %08X) ...\r", (float)TempLng / CmdLen * 100,
MinSecStr, TempStr, VGMPos, VGMHead.lngEOFOffset);
CmdTimer = GetTickCount() + 200;
}
#endif
}
printf("\t\t\t\t\t\t\t\t\r");
printf("%u PWM writes found.\n", WriteCount);
return;
}
static UINT32 gcd(UINT32 x, UINT32 y)
{
UINT32 shift;
UINT32 diff;
// Thanks to Wikipedia for this algorithm
// http://en.wikipedia.org/wiki/Binary_GCD_algorithm
if (! x || ! y)
return x | y;
for (shift = 0; ((x | y) & 1) == 0; shift ++)
{
x >>= 1;
y >>= 1;
}
while((x & 1) == 0)
x >>= 1;
do
{
while((y & 1) == 0)
y >>= 1;
if (x < y)
{
y -= x;
}
else
{
diff = x - y;
x = y;
y = diff;
}
y >>= 1;
} while(y);
return x << shift;
}
static void DataReducer(void)
{
UINT32 MinSmplUsg;
UINT32 SmplGCD;
UINT16 LstSmpl;
UINT32 SmplRep;
UINT32 CurWrt;
UINT32 SrcWrt;
bool LoopWaiting;
if (! WriteCount)
return;
//if (VGMWrite[0].Port != VGMWrite[1].Port)
// return;
MinSmplUsg = WriteCount;
LstSmpl = 0xFFFF;
for (CurWrt = 0x00; CurWrt < WriteCount; CurWrt ++)
{
if (LstSmpl != VGMWrite[CurWrt].Value)
{
LstSmpl = VGMWrite[CurWrt].Value;
if (SmplRep == 0x01)
return;
if (SmplRep < MinSmplUsg)
MinSmplUsg = SmplRep;
SmplRep = 0x00;
}
SmplRep ++;
}
if (SmplRep < MinSmplUsg)
MinSmplUsg = SmplRep;
LstSmpl = 0xFFFF;
SmplGCD = MinSmplUsg;
for (CurWrt = 0x00; CurWrt < WriteCount; CurWrt ++)
{
if (LstSmpl != VGMWrite[CurWrt].Value)
{
LstSmpl = VGMWrite[CurWrt].Value;
SmplGCD = gcd(SmplRep, SmplGCD);
if (SmplGCD == 0x01)
return;
SmplRep = 0x00;
}
SmplRep ++;
}
printf("Data Reduction x%u ...", SmplGCD);
// Eliminate multiple samples
LoopWaiting = false;
if (VGMWrite[0].Port != VGMWrite[1].Port)
VGMWrite[0].Port |= VGMWrite[1].Port << 4;
for (CurWrt = 0x00, SrcWrt = 0x00; SrcWrt < WriteCount; CurWrt ++)
{
VGMWrite[CurWrt] = VGMWrite[SrcWrt];
if (LoopWaiting)
{
VGMWrite[CurWrt].Port |= 0x80;
LoopWaiting = false;
}
for (SmplRep = 0x00; SmplRep < SmplGCD; SmplRep ++, SrcWrt ++)
{
if (VGMWrite[SrcWrt].Port & 0x80)
LoopWaiting = true;
}
}
WriteCount = CurWrt;
printf(" Done.\n");
return;
}
static void MakeDataStream(void)
{
const char* CHN_STR[0x03] = {"Left", "Right", "Both"};
UINT32 CurWrt;
UINT32 WrtCount;
DATA_WRITE* TempWrt;
STRM_CTRL_CMD* TempCmd;
UINT16* DataStr;
UINT64 CmdDiff;
UINT32 SmplDiff;
UINT8 ChnCnt;
UINT8 CurChn;
PWM_CHN PWMChn[0x02];
PWM_CHN* TempChn;
UINT8 TempByt;
VGMStream.Type = 0x03; // PWM Data Block
VGMStream.Length = WriteCount * 0x02; // 2 Bytes per Write
VGMStream.Data = malloc(VGMStream.Length);
DataStr = (UINT16*)VGMStream.Data;
for (CurChn = 0x00; CurChn < 0x02; CurChn ++)
{
TempChn = &PWMChn[CurChn];
TempChn->Command = 0xFF;
TempChn->SmplStart = 0x00000000;
TempChn->SmplEnd = 0x00000000;
TempChn->SmplLoop = 0xFFFFFFFF;
TempChn->CmdCount = 0x00;
TempChn->CmdEnd = 0xFFFFFFFF;
TempChn->CmdLoop = 0xFFFFFFFF;
TempChn->Frequency = 0x00000000;
}
WrtCount = 0x00;
for (CurWrt = 0x00; CurWrt < WriteCount; CurWrt ++)
{
TempWrt = &VGMWrite[CurWrt];
TempByt = TempWrt->Port & 0x03;
for (CurChn = 0x00; CurChn < 0x02; CurChn ++)
{
TempChn = &PWMChn[CurChn];
if (TempChn->Command == TempByt)
{
break;
}
else if (TempChn->Command == 0xFF)
{
TempChn->Command = TempByt;
TempChn->SmplStart = TempWrt->SmplPos;
break;
}
}
if (CurChn >= 0x02)
continue;
if (TempWrt->Port & 0x80)
{
TempChn->SmplLoop = TempWrt->SmplPos;
TempChn->CmdLoop = WrtCount;
}
DataStr[WrtCount] = TempWrt->Value;
WrtCount ++;
TempChn->CmdCount ++;
if (TempWrt->SmplPos > TempChn->SmplEnd)
{
TempChn->SmplEnd = TempWrt->SmplPos;
TempChn->CmdEnd = TempChn->CmdCount;
}
}
if (VGMWrite[0x00].Port & 0x30)
{
CurChn = (VGMWrite[0x00].Port & 0x30) >> 4;
TempByt = (VGMWrite[0x00].Port & 0x03) >> 0;
PWMChn[CurChn] = PWMChn[TempByt];
PWMChn[CurChn].Command = CurChn;
if (PWMChn[CurChn].CmdLoop != 0xFFFFFFFF)
PWMChn[CurChn].CmdLoop ++;
}
ChnCnt = 0x00;
for (CurChn = 0x00; CurChn < 0x02; CurChn ++)
{
if (PWMChn[CurChn].Command == 0xFF)
break;
ChnCnt ++;
}
for (CurChn = 0x00; CurChn < ChnCnt; CurChn ++)
{
//Frequency = CommandCount / (SampleCount / 44100.0);
TempChn = &PWMChn[CurChn];
SmplDiff = TempChn->SmplEnd - TempChn->SmplStart;
CmdDiff = TempChn->CmdCount;
CmdDiff = 44100 * CmdDiff + SmplDiff / 2;
TempChn->Frequency = (UINT32)(CmdDiff / SmplDiff);
printf("PWM Frequency %s Chn: %u\n", CHN_STR[TempChn->Command], TempChn->Frequency);
if (TempChn->SmplLoop < TempChn->SmplStart)
{
// this case IS possible (e.g. loop at 0.5s, stream start at 1.0s)
TempChn->SmplLoop = 0xFFFFFFFF;
TempChn->CmdLoop = 0xFFFFFFFF;
}
}
CtrlCmdCount = 0x00;
for (CurChn = 0x00; CurChn < ChnCnt; CurChn ++)
{
TempCmd = &VGMCtrlCmd[CtrlCmdCount];
CtrlCmdCount ++;
TempCmd->Command = 0x90; // Setup Stream 00
TempCmd->StreamID = CurChn;
TempCmd->DataB1 = 0x11; // 0x11 - PWM chip
TempCmd->DataB2 = 0x00;
TempCmd->DataB3 = 0x02 + PWMChn[CurChn].Command;
TempCmd = &VGMCtrlCmd[CtrlCmdCount];
CtrlCmdCount ++;
TempCmd->Command = 0x91; // Set Stream 00 Data
TempCmd->StreamID = CurChn;
TempCmd->DataB1 = VGMStream.Type;
if (VGMWrite[0x00].Port & 0x30)
{
TempCmd->DataB2 = 0x01; // Step Size
TempCmd->DataB3 = 0x00; // Step Base
}
else
{
TempCmd->DataB2 = ChnCnt; // Step Size
TempCmd->DataB3 = CurChn; // Step Base
}
}
for (CurChn = 0x00; CurChn < ChnCnt; CurChn ++)
{
TempCmd = &VGMCtrlCmd[CtrlCmdCount];
CtrlCmdCount ++;
TempCmd->Command = 0x92; // Setup Stream Frequency (and Fast-Play Value)
TempCmd->StreamID = CurChn;
TempCmd->DataL1 = PWMChn[CurChn].Frequency;
TempCmd->DataS1 = 0x0000; // Block ID
TempCmd->DataB1 = 0x00; // No looping
}
for (CurChn = 0x00; CurChn < ChnCnt; CurChn ++)
{
if (PWMChn[CurChn].CmdLoop == 0xFFFFFFFF)
continue;
TempCmd = &VGMCtrlCmd[CtrlCmdCount];
CtrlCmdCount ++;
TempCmd->Command = 0x93; // Play Stream (long call for loop reposition)
TempCmd->StreamID = CurChn;
TempCmd->DataL1 = (PWMChn[CurChn].CmdLoop - CurChn) * 0x02;
TempCmd->DataB1 = 0x03; // play until end
TempCmd->DataL2 = 0x00;
}
return;
}
static void RewriteVGMData(void)
{
UINT32 DstPos;
UINT8 Command;
UINT32 CmdDelay;
UINT32 AllDelay;
UINT8 TempByt;
UINT16 TempSht;
UINT32 TempLng;
STRM_CTRL_CMD* TempCmd;
#ifdef WIN32
UINT32 CmdTimer;
char TempStr[0x80];
char MinSecStr[0x80];
#endif
UINT32 CmdLen;
bool StopVGM;
bool WriteEvent;
bool WriteExtra;
UINT32 NewLoopS;
UINT32 StrmCmd;
bool ChnWritten[0x03];
bool FirstAfterLoop[0x03];
#ifdef EXTRA_SYNC
UINT32 SyncCnt[0x03];
UINT32 DataPos[0x03];
UINT32 PWMFreq;
UINT32 PWMStep;
#endif
DstData = (UINT8*)malloc(VGMDataLen + 0x100);
AllDelay = 0;
VGMPos = VGMHead.lngDataOffset;
DstPos = VGMHead.lngDataOffset;
VGMSmplPos = 0;
NewLoopS = 0x00;
memcpy(DstData, VGMData, VGMPos); // Copy Header
for (TempByt = 0x00; TempByt < 0x03; TempByt ++)
{
ChnWritten[TempByt] = false;
FirstAfterLoop[TempByt] = false;
#ifdef EXTRA_SYNC
SyncCnt[TempByt] = 0x00;
DataPos[TempByt] = 0x00;
#endif
}
#ifdef WIN32
CmdTimer = 0;
#endif
StopVGM = false;
DstData[DstPos + 0x00] = 0x67;
DstData[DstPos + 0x01] = 0x66;
DstData[DstPos + 0x02] = VGMStream.Type;
memcpy(&DstData[DstPos + 0x03], &VGMStream.Length, 0x04);
memcpy(&DstData[DstPos + 0x07], VGMStream.Data, VGMStream.Length);
DstPos += 0x07 + VGMStream.Length;
for (StrmCmd = 0x00; StrmCmd < CtrlCmdCount; StrmCmd ++)
{
TempCmd = &VGMCtrlCmd[StrmCmd];
if (TempCmd->Command >= 0x92)
break;
DstData[DstPos + 0x00] = TempCmd->Command;
DstData[DstPos + 0x01] = TempCmd->StreamID;
switch(TempCmd->Command)
{
case 0x90:
DstData[DstPos + 0x02] = TempCmd->DataB1;
DstData[DstPos + 0x03] = TempCmd->DataB2;
DstData[DstPos + 0x04] = TempCmd->DataB3;
DstPos += 0x05;
break;
case 0x91:
DstData[DstPos + 0x02] = TempCmd->DataB1;
DstData[DstPos + 0x03] = TempCmd->DataB2;
#ifdef EXTRA_SYNC
PWMStep = TempCmd->DataB2 * 2;
#endif
DstData[DstPos + 0x04] = TempCmd->DataB3;
DstPos += 0x05;
break;
}
}
#ifdef EXTRA_SYNC
PWMFreq = 0xFFFFFFFF;
#endif
while(VGMPos < VGMHead.lngEOFOffset)
{
CmdDelay = 0;
CmdLen = 0x00;
Command = VGMData[VGMPos + 0x00];
WriteEvent = true;
WriteExtra = false;
if (VGMPos == VGMHead.lngLoopOffset)
{
for (TempByt = 0x00; TempByt < 0x03; TempByt ++)
FirstAfterLoop[TempByt] = true;
WriteExtra = true;
}
if (Command >= 0x70 && Command <= 0x8F)
{
switch(Command & 0xF0)
{
case 0x70:
TempSht = (Command & 0x0F) + 0x01;
VGMSmplPos += TempSht;
CmdDelay = TempSht;
WriteEvent = false;
break;
case 0x80:
TempSht = Command & 0x0F;
VGMSmplPos += TempSht;
//CmdDelay = TempSht;
break;
}
CmdLen = 0x01;
}
else
{
switch(Command)
{
case 0x66: // End Of File
CmdLen = 0x01;
StopVGM = true;
break;
case 0x62: // 1/60s delay
TempSht = 735;
VGMSmplPos += TempSht;
CmdDelay = TempSht;
CmdLen = 0x01;
WriteEvent = false;
break;
case 0x63: // 1/50s delay
TempSht = 882;
VGMSmplPos += TempSht;
CmdDelay = TempSht;
CmdLen = 0x01;
WriteEvent = false;
break;
case 0x61: // xx Sample Delay
memcpy(&TempSht, &VGMData[VGMPos + 0x01], 0x02);
VGMSmplPos += TempSht;
CmdDelay = TempSht;
CmdLen = 0x03;
WriteEvent = false;
break;
case 0x50: // SN76496 write
CmdLen = 0x02;
break;
case 0xB2: // PWM write
TempByt = VGMData[VGMPos + 0x01] >> 4;
// Channel Write: 0x02 - Left, 0x03 - Right, 0x04 - Both
if (TempByt >= 0x02 && TempByt <= 0x04)
{
TempByt -= 0x02;
if (! ChnWritten[TempByt] || FirstAfterLoop[TempByt])
WriteExtra = true;
#ifdef EXTRA_SYNC
if (! (SyncCnt[TempByt] % PWMFreq))
WriteExtra = true;
#endif
WriteEvent = false;
}
CmdLen = 0x03;
break;
case 0x67: // PCM Data Stream
TempByt = VGMData[VGMPos + 0x02];
memcpy(&TempLng, &VGMData[VGMPos + 0x03], 0x04);
TempLng &= 0x7FFFFFFF;
CmdLen = 0x07 + TempLng;
break;
case 0x90: // DAC Ctrl: Setup Chip
VGMPos += 0x05;
break;
case 0x91: // DAC Ctrl: Set Data
VGMPos += 0x05;
break;
case 0x92: // DAC Ctrl: Set Freq
VGMPos += 0x06;
break;
case 0x93: // DAC Ctrl: Play from Start Pos
VGMPos += 0x0B;
break;
case 0x94: // DAC Ctrl: Stop immediately
VGMPos += 0x02;
break;
case 0x95: // DAC Ctrl: Play Block (small)
VGMPos += 0x05;
break;
default: // Handle all other known and unknown commands
switch(Command & 0xF0)
{
case 0x30:
case 0x40:
CmdLen = 0x02;
break;
case 0x50:
case 0xA0:
case 0xB0:
CmdLen = 0x03;
break;
case 0xC0:
case 0xD0:
CmdLen = 0x04;
break;
case 0xE0:
case 0xF0:
CmdLen = 0x05;
break;
default:
printf("Unknown Command: %X\n", Command);
CmdLen = 0x01;
//StopVGM = true;
break;
}
break;
}
}
if (WriteEvent || WriteExtra)
{
if (VGMPos != VGMHead.lngLoopOffset)
{
AllDelay += CmdDelay;
CmdDelay = 0x00;
}
while(AllDelay)
{
if (AllDelay <= 0xFFFF)
TempSht = (UINT16)AllDelay;
else
TempSht = 0xFFFF;
if (! TempSht)
{
// don't do anything - I just want to be safe
}
if (TempSht <= 0x10)
{
DstData[DstPos] = 0x70 | (TempSht - 0x01);
DstPos ++;
}
else if (TempSht <= 0x20)
{
DstData[DstPos] = 0x7F;
DstPos ++;
DstData[DstPos] = 0x70 | (TempSht - 0x11);
DstPos ++;
}
else if ((TempSht >= 735 && TempSht <= 751) || TempSht == 1470)
{
TempLng = TempSht;
while(TempLng >= 735)
{
DstData[DstPos] = 0x62;
DstPos ++;
TempLng -= 735;
}
TempSht -= (UINT16)TempLng;
}
else if ((TempSht >= 882 && TempSht <= 898) || TempSht == 1764)
{
TempLng = TempSht;
while(TempLng >= 882)
{
DstData[DstPos] = 0x63;
DstPos ++;
TempLng -= 882;
}
TempSht -= (UINT16)TempLng;
}
else if (TempSht == 1617)
{
DstData[DstPos] = 0x63;
DstPos ++;
DstData[DstPos] = 0x62;
DstPos ++;
}
else
{