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opt_oki.c
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// opt_oki.c - VGM OKIM6258 Optimizer
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "stdtype.h"
#include "stdbool.h"
#include "VGMFile.h"
#include "common.h"
// Structures
typedef struct vgm_dma_action
{
UINT32 posStart;
UINT32 posEnd;
UINT32 smplStart;
UINT32 dmaStartOfs;
UINT32 dmaLength;
UINT32 length; // actual length
UINT32 dalloc; // data allocation size
UINT8* data;
UINT8 chipID;
UINT16 drumID;
} DMA_ACTION;
typedef struct vgm_drum_info
{
UINT32 id;
UINT32 length;
UINT8* data;
UINT32 sortKey;
UINT32 playCount;
} DRUM_INF;
typedef struct vgm_drum_table
{
UINT32 DrmCount;
UINT32 DrmAlloc;
DRUM_INF* Drums;
} DRUM_TABLE;
typedef struct stream_control_command
{
UINT8 Command;
UINT8 StreamID;
UINT8 DataB1;
UINT8 DataB2;
UINT8 DataB3;
UINT16 DataS1;
UINT32 DataL1;
UINT32 DataL2;
} STRM_CTRL_CMD;
// Function Prototypes
static bool OpenVGMFile(const char* FileName);
static void WriteVGMFile(const char* FileName);
static void EnumerateOkiWrites(void);
static void GenerateDrumTable(void);
static void WriteDACStreamCmd(const STRM_CTRL_CMD* StrmCmd, UINT8* DstData, UINT32* DestPos);
static UINT32 GetOkiStreamRate(UINT32 clock, UINT8 div);
static void RewriteVGMData(void);
static UINT16 ReadBE16(const UINT8* data);
static UINT32 ReadBE32(const UINT8* data);
static UINT32 ReadLE32(const UINT8* data);
static void WriteLE32(UINT8* buffer, UINT32 value);
// Variables
VGM_HEADER VGMHead;
UINT32 VGMLoopSmplOfs;
UINT32 VGMDataLen;
UINT8* VGMData;
UINT32 VGMPos;
INT32 VGMSmplPos;
UINT8* DstData;
UINT32 DstDataLen;
char FileBase[0x100];
UINT32 DataSizeA;
UINT32 DataSizeB;
UINT8 ChipCnt;
UINT32 DmaActAlloc;
UINT32 DmaActCount;
DMA_ACTION* DmaActions;
UINT32 DmaActAtLoop;
DRUM_TABLE DrumTbl;
UINT8 OkiActionMask[2]; // [0] = 1st chip, [1] = 2nd chip
UINT32 StreamEventCount[2]; // total event count, for memory preallocation, [0] = frequency changes, [1] = play commands
bool DumpDrums;
bool FuzzyCompare;
int main(int argc, char* argv[])
{
int argbase;
int ErrVal;
char FileName[0x100];
printf("VGM OKIM6258 Optimizer\n----------------------\n\n");
DumpDrums = false;
FuzzyCompare = true;
ErrVal = 0;
argbase = 1;
while(argbase < argc && argv[argbase][0] == '-')
{
if (! stricmp(argv[argbase], "-dump"))
{
DumpDrums = true;
argbase ++;
}
else if (! stricmp(argv[argbase], "-nofuzz"))
{
FuzzyCompare = false;
argbase ++;
}
else
{
break;
}
}
printf("File Name:\t");
if (argc <= argbase + 0)
{
ReadFilename(FileName, 0x100);
}
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");
EnumerateOkiWrites();
if (DmaActCount == 0)
{
printf("No OKIM6258 DMA streams found.\n");
free(DmaActions);
free(VGMData);
goto EndProgram;
}
if (((OkiActionMask[0] | OkiActionMask[1]) & 0x02))
printf("DMA start offset will be used to help sorting drums.\n");
else
printf("Drums will be sorted in order of occourrence.\n");
GenerateDrumTable();
RewriteVGMData();
printf("Data Compression: %u -> %u (%.1f %%)\n",
DataSizeA, DataSizeB, 100.0 * DataSizeB / (float)DataSizeA);
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(DmaActions);
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");
if (hFile == NULL)
{
printf("Error writing %s!\n", FileName);
return;
}
fwrite(DstData, 0x01, DstDataLen, hFile);
fclose(hFile);
printf("File written.\n");
return;
}
static void EnumerateOkiWrites(void)
{
UINT8 Command;
UINT8 curChip;
UINT8 TempByt;
UINT16 TempSht;
UINT32 TempLng;
#ifdef WIN32
UINT32 CmdTimer;
char TempStr[0x80];
char MinSecStr[0x80];
#endif
UINT32 CmdLen;
bool StopVGM;
UINT8 curReg;
UINT8 curData;
UINT32 activeDmaID[2];
UINT32 lastOkiWrtSmpl[2];
UINT8 dmaState[2][8];
UINT8 clkState[2][5];
VGMLoopSmplOfs = VGMHead.lngTotalSamples - VGMHead.lngLoopSamples;
VGMPos = VGMHead.lngDataOffset;
VGMSmplPos = 0;
ChipCnt = (VGMHead.lngHzOKIM6258 & 0x40000000) ? 2 : 1;
DmaActions = NULL;
DmaActAlloc = 0;
DmaActCount = 0;
DmaActAtLoop = (UINT32)-1;
for (curChip = 0; curChip < 2; curChip ++)
{
activeDmaID[curChip] = (UINT32)-1;
lastOkiWrtSmpl[curChip] = 0;
}
memset(dmaState, 0x00, sizeof(dmaState));
memset(OkiActionMask, 0x00, sizeof(OkiActionMask));
memset(StreamEventCount, 0x00, sizeof(StreamEventCount));
for (curChip = 0; curChip < 2; curChip ++)
{
WriteLE32(&clkState[curChip][0], VGMHead.lngHzOKIM6258 & 0x3FFFFFFF);
clkState[curChip][4] = VGMHead.bytOKI6258Flags & 0x03;
}
#ifdef WIN32
CmdTimer = 0;
#endif
StopVGM = false;
while(VGMPos < VGMHead.lngEOFOffset)
{
if (VGMPos == VGMHead.lngLoopOffset)
DmaActAtLoop = activeDmaID[0]; // ID for DmaActions[] or (UINT32)-1
CmdLen = 0x00;
Command = VGMData[VGMPos + 0x00];
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 0xB7: // OKIM6258 write
curChip = (VGMData[VGMPos + 0x01] & 0x80) >> 7;
curReg = VGMData[VGMPos + 0x01] & 0x7F;
curData = VGMData[VGMPos + 0x02];
CmdLen = 0x03;
if (curChip >= ChipCnt)
break;
if (curReg == 0x01)
{
if (activeDmaID[curChip] != (UINT32)-1)
{
DMA_ACTION* dmaAct = &DmaActions[activeDmaID[curChip]];
if (dmaAct->length >= dmaAct->dalloc)
{
dmaAct->dalloc += 0x10000;
dmaAct->data = (UINT8*)realloc(dmaAct->data, dmaAct->dalloc);
}
dmaAct->data[dmaAct->length] = curData;
dmaAct->length ++;
}
lastOkiWrtSmpl[curChip] = VGMSmplPos;
}
else if (curReg >= 0x08 && curReg <= 0x0C)
{
if (curReg == 0x0B)
curData &= 0x3F;
if (curReg == 0x0B || curReg == 0x0C)
OkiActionMask[curChip] |= 0x10; // mark clock change
//if (curData != clkState[curChip][curReg & 0x07])
// printf("Warning! Clock change at 0x%06X\n", VGMPos);
clkState[curChip][curReg & 0x07] = curData;
StreamEventCount[0] ++;
}
else if (curReg >= 0x10 && curReg <= 0x17)
{
dmaState[curChip][curReg & 0x07] = curData;
}
if (curReg == 0x17) // no "else" if is intended
{
UINT8 dmaMask = (1 << curChip);
// Bit 7 (80): start (trigger)
// Bit 6 (40): continue (trigger)
// Bit 5 (20): halt (state)
// Bit 4 (10): abort (trigger)
// Bit 3 (08): interrupt (state)
if ((curData & 0x10) && activeDmaID[curChip] != (UINT32)-1) // DMA Stop
{
DMA_ACTION* dmaAct = &DmaActions[activeDmaID[curChip]];
dmaAct->posEnd = VGMPos;
if (dmaAct->dmaLength && dmaAct->length > dmaAct->dmaLength)
printf("Warning: OKI writes (%u) > DMA length (%u) at sample %u\n",
dmaAct->length, dmaAct->dmaLength, lastOkiWrtSmpl[curChip]);
activeDmaID[curChip] = (UINT32)-1;
}
if (curData & 0x80) // DMA Start
{
DMA_ACTION* dmaAct;
UINT32 dmaID = DmaActCount;
if (activeDmaID[curChip] != (UINT32)-1)
DmaActions[activeDmaID[curChip]].posEnd = VGMPos;
if (DmaActCount >= DmaActAlloc)
{
DmaActAlloc += 0x100;
DmaActions = (DMA_ACTION*)realloc(DmaActions,
DmaActAlloc * sizeof(DMA_ACTION));
}
dmaAct = &DmaActions[dmaID];
dmaAct->chipID = curChip;
dmaAct->posStart = VGMPos;
dmaAct->posEnd = (UINT32)-1;
dmaAct->smplStart = VGMSmplPos;
{
UINT8* dsData = dmaState[curChip];
dmaAct->dmaStartOfs = ReadBE32(&dsData[0]);
dmaAct->dmaLength = ReadBE16(&dsData[4]);
if (dmaAct->dmaStartOfs)
OkiActionMask[curChip] |= 0x02;
}
dmaAct->data = NULL;
dmaAct->dalloc = dmaAct->length = 0x00;
DmaActCount ++;
activeDmaID[curChip] = dmaID;
OkiActionMask[curChip] |= 0x01; // uses ADPCM stream
if (!(OkiActionMask[curChip] & 0x10)) // no clock change yet?
OkiActionMask[curChip] |= 0x20; // require explicit frequency setting at init
StreamEventCount[1] ++;
}
else if (curData & 0x40) // DMA continue
{
if (activeDmaID[curChip] != (UINT32)-1)
{
DMA_ACTION* dmaAct = &DmaActions[activeDmaID[curChip]];
UINT8* dsData = dmaState[curChip];
dmaAct->dmaLength += ReadBE16(&dsData[4]);
}
}
}
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 OKI writes found.\n", DmaActCount);
return;
}
static int drum_sort_compare(const void* p1, const void* p2)
{
DRUM_INF* Drm1 = (DRUM_INF*)p1;
DRUM_INF* Drm2 = (DRUM_INF*)p2;
if (Drm1->sortKey < Drm2->sortKey)
return -1;
else if (Drm1->sortKey > Drm2->sortKey)
return +1;
// sort key is equal - compare ID to ensure a stable sort with equal sort keys
else if (Drm1->id < Drm2->id)
return -1;
else if (Drm1->id > Drm2->id)
return +1;
else
return 0;
}
static UINT32 SearchDrumSound(DMA_ACTION* dmaAct, UINT32 sortKey, UINT32* numResults)
{
UINT32 resCount;
UINT32 resIDs[0x10]; // result IDs
UINT32 srCount;
UINT32 srIDs[0x10]; // result IDs with "sort key" match
UINT32 curDrm;
resCount = srCount = 0;
for (curDrm = 0; curDrm < DrumTbl.DrmCount; curDrm ++)
{
DRUM_INF* dInf = &DrumTbl.Drums[curDrm];
UINT32 cmpLen = (dmaAct->length < dInf->length) ? dmaAct->length : dInf->length;
// Ignoring the last 4 bytes should make it resistant against
// PCM drivers that send "stream termination" commands.
if (cmpLen >= 0x14 && FuzzyCompare)
cmpLen -= 0x04;
if (! memcmp(dmaAct->data, dInf->data, cmpLen))
{
if (resCount >= 0x10)
break;
resIDs[resCount] = curDrm;
resCount ++;
if (dInf->sortKey == sortKey)
{
srIDs[srCount] = curDrm;
srCount ++;
}
}
}
if (srCount > 0) // prefer results with "sort key" match
{
if (numResults != NULL)
*numResults = srCount;
if (srCount >= 2)
{
printf("Warning: Ambiguous drum found. VGM sample pos %u, length %u bytes, %u candidates\n",
dmaAct->smplStart, dmaAct->length, srCount);
}
return srIDs[0]; // return first (possiby only) result
}
else
{
if (numResults != NULL)
*numResults = resCount;
if (resCount == 0)
return (UINT32)-1; // no match found
if (resCount > 1)
{
printf("Warning: Ambiguous drum found. VGM sample pos %u, length %u bytes, %u candidates\n",
dmaAct->smplStart, dmaAct->length, resCount);
}
return resIDs[0]; // return first (possiby only) result
}
}
static void GenerateDrumTable(void)
{
UINT32 curDA;
UINT32 curDrm;
UINT32* drmRevIDs;
DrumTbl.DrmCount = 0x00;
DrumTbl.DrmAlloc = 0x100;
DrumTbl.Drums = (DRUM_INF*)malloc(DrumTbl.DrmAlloc * sizeof(DRUM_INF));
for (curDA = 0; curDA < DmaActCount; curDA ++)
{
DMA_ACTION* dmaAct = &DmaActions[curDA];
UINT32 sortKey = dmaAct->dmaStartOfs;
UINT32 resultCnt;
UINT32 drmIdFound = SearchDrumSound(dmaAct, sortKey, &resultCnt);
if (resultCnt > 1 && curDA == DmaActCount - 1 && DmaActAtLoop != (UINT32)-1)
{
// ambiguous drum at EOF - check against "active" sample at loop point
DMA_ACTION* daLoop = &DmaActions[DmaActAtLoop];
// check that the "part before EOF" matches the beginning of the sample at loop
if (dmaAct->length <= daLoop->length && !memcmp(dmaAct->data, daLoop->data, dmaAct->length))
{
UINT32 drmIdLoop = SearchDrumSound(daLoop, sortKey, &resultCnt);
if (resultCnt == 1)
{
drmIdFound = drmIdLoop;
printf("Ambiguity resolved using drum at loop point!\n");
}
}
}
if (drmIdFound != (UINT32)-1)
{
DRUM_INF* dInf = &DrumTbl.Drums[drmIdFound];
if (dmaAct->length > dInf->length)
{
dInf->length = dmaAct->length;
dInf->data = dmaAct->data;
dInf->sortKey = sortKey;
}
}
else
{
DRUM_INF* dInf;
drmIdFound = DrumTbl.DrmCount;
if (DrumTbl.DrmCount >= DrumTbl.DrmAlloc)
{
DrumTbl.DrmAlloc += 0x100;
DrumTbl.Drums = (DRUM_INF*)realloc(DrumTbl.Drums,
DrumTbl.DrmAlloc * sizeof(DRUM_INF));
}
dInf = &DrumTbl.Drums[DrumTbl.DrmCount];
DrumTbl.DrmCount ++;
dInf->length = dmaAct->length;
dInf->data = dmaAct->data;
dInf->sortKey = sortKey;
dInf->playCount = 0;
}
dmaAct->drumID = drmIdFound;
DrumTbl.Drums[drmIdFound].playCount ++;
}
if (DumpDrums)
{
for (curDrm = 0; curDrm < DrumTbl.DrmCount; curDrm ++)
{
char DrumDump_Name[MAX_PATH + 0x10];
FILE* hFile;
DRUM_INF* dInf = &DrumTbl.Drums[curDrm];
if (!dInf->sortKey)
sprintf(DrumDump_Name, "%s_%03X.bin", FileBase, curDrm);
else
sprintf(DrumDump_Name, "%s_%03X_ofs-%06X.bin", FileBase, curDrm, dInf->sortKey);
hFile = fopen(DrumDump_Name, "wb");
if (hFile != NULL)
{
fwrite(dInf->data, 0x01, dInf->length, hFile);
fclose(hFile);
}
}
}
// sort by sortKey
for (curDrm = 0; curDrm < DrumTbl.DrmCount; curDrm ++)
DrumTbl.Drums[curDrm].id = curDrm;
qsort(DrumTbl.Drums, DrumTbl.DrmCount, sizeof(DRUM_INF), &drum_sort_compare);
// and fix all the drum IDs in DMA actions
drmRevIDs = (UINT32*)malloc(DrumTbl.DrmCount * sizeof(UINT32));
for (curDrm = 0; curDrm < DrumTbl.DrmCount; curDrm ++)
drmRevIDs[DrumTbl.Drums[curDrm].id] = curDrm;
for (curDA = 0; curDA < DmaActCount; curDA ++)
{
DMA_ACTION* dmaAct = &DmaActions[curDA];
if (dmaAct->drumID < DrumTbl.DrmCount)
dmaAct->drumID = drmRevIDs[dmaAct->drumID];
}
free(drmRevIDs);
return;
}
static void WriteDACStreamCmd(const STRM_CTRL_CMD* StrmCmd, UINT8* DstData, UINT32* DestPos)
{
UINT32 DstPos;
DstPos = *DestPos;
DstData[DstPos + 0x00] = StrmCmd->Command;
DstData[DstPos + 0x01] = StrmCmd->StreamID;
switch(StrmCmd->Command)
{
case 0x90:
DstData[DstPos + 0x02] = StrmCmd->DataB1;
DstData[DstPos + 0x03] = StrmCmd->DataB2;
DstData[DstPos + 0x04] = StrmCmd->DataB3;
DstPos += 0x05;
break;
case 0x91:
DstData[DstPos + 0x02] = StrmCmd->DataB1;
DstData[DstPos + 0x03] = StrmCmd->DataB2;
DstData[DstPos + 0x04] = StrmCmd->DataB3;
DstPos += 0x05;
break;
case 0x92:
memcpy(&DstData[DstPos + 0x02], &StrmCmd->DataL1, 0x04);
DstPos += 0x06;
break;
case 0x94:
DstPos += 0x02;
break;
case 0x95:
memcpy(&DstData[DstPos + 0x02], &StrmCmd->DataS1, 0x02);
DstData[DstPos + 0x04] = StrmCmd->DataB1;
DstPos += 0x05;
break;
}
*DestPos = DstPos;
return;
}
static UINT32 GetOkiStreamRate(UINT32 clock, UINT8 div)
{
static const UINT32 OKI_CLK_DIVS[4] = {1024, 768, 512, 512};
UINT32 realDiv = OKI_CLK_DIVS[div & 0x03] * 2; // *2 because ADPCM data rate = half the sample rate
return (clock + realDiv / 2) / realDiv;
}
static void RewriteVGMData(void)
{
UINT32 DstPos;
UINT8 Command;
UINT8 curChip;
UINT32 CmdDelay;
UINT32 AllDelay;
UINT8 TempByt;
UINT16 TempSht;
UINT32 TempLng;
#ifdef WIN32
UINT32 CmdTimer;
char TempStr[0x80];
char MinSecStr[0x80];
#endif
UINT32 CmdLen;
bool StopVGM;
bool WriteEvent;
bool WriteExtra;
UINT32 NewLoopPos;
UINT8 curReg;
UINT8 curData;
UINT32 nextDmaID;
UINT32 activeDmaID[2];
UINT8 clkState[2][5];
UINT32 okiClock[2];
UINT8 okiDivider[2];
UINT32 okiFreq[2];
UINT8 okiStrmState;
// data to be appended after current VGM command
UINT32 appendLen;
UINT8 appendBuf[0x100];
DstDataLen = VGMDataLen + 0x100;
DstDataLen += StreamEventCount[0] * 0x06 + StreamEventCount[1] * 0x05;
DstData = (UINT8*)malloc(DstDataLen);
AllDelay = 0;
VGMPos = VGMHead.lngDataOffset;
DstPos = VGMHead.lngDataOffset;
VGMSmplPos = 0;
NewLoopPos = 0x00;
memcpy(DstData, VGMData, VGMPos); // Copy Header
#ifdef WIN32
CmdTimer = 0;
#endif
StopVGM = false;
// write data blocks with drum samples (one block for each sample)
for (TempLng = 0x00; TempLng < DrumTbl.DrmCount; TempLng ++)
{
DRUM_INF* TempDrm = &DrumTbl.Drums[TempLng];
DstData[DstPos + 0x00] = 0x67;
DstData[DstPos + 0x01] = 0x66;
DstData[DstPos + 0x02] = 0x04; // OKIM6258 Data Block
memcpy(&DstData[DstPos + 0x03], &TempDrm->length, 0x04);
memcpy(&DstData[DstPos + 0x07], TempDrm->data, TempDrm->length);
DstPos += 0x07 + TempDrm->length;
}
for (curChip = 0; curChip < 2; curChip ++)
{
okiClock[curChip] = VGMHead.lngHzOKIM6258 & 0x3FFFFFFF;
okiDivider[curChip] = VGMHead.bytOKI6258Flags & 0x03;
WriteLE32(&clkState[curChip][0], okiClock[curChip]);
clkState[curChip][4] = okiDivider[curChip];
activeDmaID[curChip] = (UINT32)-1;
okiFreq[curChip] = 0;
}
for (curChip = 0; curChip < ChipCnt; curChip ++)
{
STRM_CTRL_CMD scCmd;
if (OkiActionMask[curChip] & 0x01)
{
scCmd.Command = 0x90; // Setup Stream 00
scCmd.StreamID = curChip;
scCmd.DataB1 = 0x17 | (curChip << 7); // 0x17 - OKIM6258 chip
scCmd.DataB2 = 0x00;
scCmd.DataB3 = 0x01; // command 01: data write
WriteDACStreamCmd(&scCmd, DstData, &DstPos);
scCmd.Command = 0x91; // Set Stream 00 Data
scCmd.StreamID = curChip;
scCmd.DataB1 = 0x04; // Block Type 04: OKIM6258 Data Block
scCmd.DataB2 = 0x01; // Step Size
scCmd.DataB3 = 0x00; // Step Base
WriteDACStreamCmd(&scCmd, DstData, &DstPos);
}
if (OkiActionMask[curChip] & 0x20) // when frequency init is required
{
scCmd.Command = 0x92; // Set Stream Frequency
scCmd.StreamID = curChip;
scCmd.DataL1 = GetOkiStreamRate(okiClock[curChip], okiDivider[curChip]);
WriteDACStreamCmd(&scCmd, DstData, &DstPos);
}
}
nextDmaID = 0;
appendLen = 0;
okiStrmState = 0x00;
while(VGMPos < VGMHead.lngEOFOffset)
{
CmdDelay = 0;
CmdLen = 0x00;
Command = VGMData[VGMPos + 0x00];
WriteEvent = true;
WriteExtra = false;
if (VGMPos == VGMHead.lngLoopOffset)
{
WriteExtra = true;
for (curChip = 0; curChip < 2; curChip ++)
okiFreq[curChip] = 0; // enforce refresh
}
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 0xB7: // OKIM6258 write
curChip = (VGMData[VGMPos + 0x01] & 0x80) >> 7;
curReg = VGMData[VGMPos + 0x01] & 0x7F;
curData = VGMData[VGMPos + 0x02];
CmdLen = 0x03;
if (curChip >= ChipCnt)
break;
if (curReg == 0x01)
{
// do NOT write when within a DmaAction for this chip
if (activeDmaID[curChip] != (UINT32)-1)
{
WriteEvent = false;
if (okiStrmState & (0x10 << curChip))
{
DMA_ACTION* dmaAct = &DmaActions[activeDmaID[curChip]];
STRM_CTRL_CMD scCmd;
okiStrmState &= ~(0x10 << curChip); // remove 'pending start' bit
okiStrmState |= (0x01 << curChip); // set 'stream running' bit
scCmd.Command = 0x95; // Quick-Play block
scCmd.StreamID = curChip;
scCmd.DataS1 = dmaAct->drumID; // Block ID
scCmd.DataB1 = 0x00; // No looping
WriteDACStreamCmd(&scCmd, appendBuf, &appendLen);
WriteExtra = true;
}
}
}