/**
* Find the LOOP command
*/
XGMCommand* XGM_getLoopCommand(XGM* xgm)
{
LList* com = xgm->commands;
while(com != NULL)
{
XGMCommand* command = com->element;
if (XGMCommand_isLoop(command))
return command;
com = com->next;
}
return NULL;
}
static void XGC_extractMusic(XGM* xgc, XGM* xgm)
{
LList* vgmCommands;
LList* frameCommands = NULL;
LList* ymCommands = NULL;
LList* ymKeyCommands = NULL;
LList* psgCommands = NULL;
LList* otherCommands = NULL;
LList* newCommands = NULL;
LList* stateChange = NULL;
LList* xgcCommands;
LList* com;
LList* tmpCom;
XGMCommand* sizeCommand;
YM2612* ymOldState;
YM2612* ymState;
int j, size;
ymOldState = YM2612_create();
ymState = YM2612_create();
// reset frame
xgcCommands = createElement(XGCCommand_createFrameSizeCommand(0));
// TL / D1L / RR set to max
vgmCommands = NULL;
vgmCommands = insertAllAfterLList(vgmCommands, VGMCommand_createYMCommands(0, 0x40, 0x7F));
vgmCommands = insertAllAfterLList(vgmCommands, VGMCommand_createYMCommands(0, 0x80, 0xFF));
vgmCommands = getHeadLList(vgmCommands);
xgcCommands = insertAllAfterLList(xgcCommands, XGCCommand_convert(XGMCommand_createYMPort0Commands(vgmCommands)));
// set ym state
com = vgmCommands;
while(com != NULL)
{
VGMCommand* command = com->element;
YM2612_set(ymState, VGMCommand_getYM2612Port(command), VGMCommand_getYM2612Register(command), VGMCommand_getYM2612Value(command));
com = com->next;
}
deleteLList(vgmCommands);
vgmCommands = NULL;
vgmCommands = insertAllAfterLList(vgmCommands, VGMCommand_createYMCommands(1, 0x40, 0x7F));
vgmCommands = insertAllAfterLList(vgmCommands, VGMCommand_createYMCommands(1, 0x80, 0xFF));
vgmCommands = getHeadLList(vgmCommands);
xgcCommands = insertAllAfterLList(xgcCommands, XGCCommand_convert(XGMCommand_createYMPort1Commands(vgmCommands)));
// set ym state
com = vgmCommands;
while(com != NULL)
{
VGMCommand* command = com->element;
YM2612_set(ymState, VGMCommand_getYM2612Port(command), VGMCommand_getYM2612Register(command), VGMCommand_getYM2612Value(command));
com = com->next;
}
// key off for all channels
deleteLList(vgmCommands);
vgmCommands = NULL;
vgmCommands = insertAfterLList(vgmCommands, VGMCommand_createYMCommand(0, 0x28, 0x00));
vgmCommands = insertAfterLList(vgmCommands, VGMCommand_createYMCommand(0, 0x28, 0x01));
vgmCommands = insertAfterLList(vgmCommands, VGMCommand_createYMCommand(0, 0x28, 0x02));
vgmCommands = insertAfterLList(vgmCommands, VGMCommand_createYMCommand(0, 0x28, 0x04));
vgmCommands = insertAfterLList(vgmCommands, VGMCommand_createYMCommand(0, 0x28, 0x05));
vgmCommands = insertAfterLList(vgmCommands, VGMCommand_createYMCommand(0, 0x28, 0x06));
vgmCommands = getHeadLList(vgmCommands);
xgcCommands = insertAllAfterLList(xgcCommands, XGCCommand_convert(XGMCommand_createYMKeyCommands(vgmCommands)));
// set ym state
com = vgmCommands;
while(com != NULL)
{
VGMCommand* command = com->element;
YM2612_set(ymState, VGMCommand_getYM2612Port(command), VGMCommand_getYM2612Register(command), VGMCommand_getYM2612Value(command));
com = com->next;
}
stateChange = XGC_getStateChange(ymState, ymOldState);
// add the state commands if no empty
if (stateChange != NULL)
xgcCommands = insertAllAfterLList(xgcCommands, XGCCommand_createStateCommands(stateChange));
// add 3 dummy frames (reserve frame space for PCM shift)
xgcCommands = insertAfterLList(xgcCommands, XGCCommand_createFrameSizeCommand(0));
xgcCommands = insertAfterLList(xgcCommands, XGCCommand_createFrameSizeCommand(0));
xgcCommands = insertAfterLList(xgcCommands, XGCCommand_createFrameSizeCommand(0));
XGMCommand* loopCommand = XGM_getLoopPointedCommand(xgm);
int loopOffset = -1;
com = xgm->commands;
while(com != NULL)
{
// build frame commands
deleteLList(frameCommands);
frameCommands = NULL;
while(com != NULL)
{
// get command and pass to next one
XGMCommand* command = com->element;
com = com->next;
// this is the command where we loop
if (command == loopCommand)
{
if (loopOffset == -1)
loopOffset = XGM_getMusicDataSizeOf(getHeadLList(xgcCommands));
}
// loop information --> ignore
if (XGMCommand_isLoop(command) || XGMCommand_isEnd(command))
continue;
// stop here
if (XGMCommand_isFrame(command))
break;
// add command
frameCommands = insertAfterLList(frameCommands, command);
}
// get back to head
frameCommands = getHeadLList(frameCommands);
// update state
ymOldState = ymState;
ymState = YM2612_copy(ymOldState);
// prepare new commands for this frame
deleteLList(newCommands);
// add size command
sizeCommand = XGCCommand_createFrameSizeCommand(0);
newCommands = createElement(sizeCommand);
// group commands
deleteLList(ymCommands);
deleteLList(ymKeyCommands);
deleteLList(psgCommands);
deleteLList(otherCommands);
ymCommands = NULL;
ymKeyCommands = NULL;
psgCommands = NULL;
otherCommands = NULL;
tmpCom = frameCommands;
while(tmpCom != NULL)
{
XGMCommand* command = tmpCom->element;
if (XGMCommand_isPSGWrite(command))
psgCommands = insertAfterLList(psgCommands, command);
else if (XGMCommand_isYM2612RegKeyWrite(command))
ymKeyCommands = insertAfterLList(ymKeyCommands, command);
else if (XGMCommand_isYM2612Write(command))
{
// update YM state
for (j = 0; j < XGMCommand_getYM2612WriteCount(command); j++)
{
if (XGMCommand_isYM2612Port0Write(command))
YM2612_set(ymState, 0, command->data[(j * 2) + 1] & 0xFF, command->data[(j * 2) + 2] & 0xFF);
else
YM2612_set(ymState, 1, command->data[(j * 2) + 1] & 0xFF, command->data[(j * 2) + 2] & 0xFF);
}
// remove all $2B register writes (DAC enable is done automatically)
if (XGMCommand_removeYM2612RegWrite(command, 0, 0x2B))
ymCommands = insertAfterLList(ymCommands, command);
}
else
otherCommands = insertAfterLList(otherCommands, command);
tmpCom = tmpCom->next;
}
XGMCommand* pcmComCH[4];
pcmComCH[0] = NULL;
pcmComCH[1] = NULL;
pcmComCH[2] = NULL;
pcmComCH[3] = NULL;
// discard multi PCM command in a single frame
tmpCom = otherCommands;
while(tmpCom != NULL)
{
XGMCommand* command = tmpCom->element;
if (XGMCommand_isPCM(command))
{
// get channel
int ch = XGMCommand_getPCMChannel(command);
// already have a PCM command for this channel ?
if (pcmComCH[ch] != NULL)
{
// remove current PCM command
removeFromLList(tmpCom);
// we removed the last command --> update pointer
if (tmpCom == otherCommands)
otherCommands = tmpCom->prev;
if (!silent)
{
int frameInd = XGC_computeLenInFrameOf(getHeadLList(xgcCommands));
int id = XGMCommand_getPCMId(command);
// we are ignoring a real play command --> display it
if (id != 0)
printf("Warning: multiple PCM command on %d --> play %2X removed\n", frameInd, id);
}
}
else
pcmComCH[ch] = command;
}
tmpCom = tmpCom->prev;
}
psgCommands = getHeadLList(psgCommands);
ymCommands = getHeadLList(ymCommands);
ymKeyCommands = getHeadLList(ymKeyCommands);
otherCommands = getHeadLList(otherCommands);
// PSG commands first as PSG require main BUS access (DMA contention)
if (psgCommands != NULL)
newCommands = insertAllAfterLList(newCommands, XGCCommand_convert(psgCommands));
// then general YM commands
if (ymCommands != NULL)
newCommands = insertAllAfterLList(newCommands, XGCCommand_convert(ymCommands));
// then key commands
if (ymKeyCommands != NULL)
newCommands = insertAllAfterLList(newCommands, XGCCommand_convert(ymKeyCommands));
// and finally others commands
if (otherCommands != NULL)
newCommands = insertAllAfterLList(newCommands, XGCCommand_convert(otherCommands));
// state change
stateChange = XGC_getStateChange(ymState, ymOldState);
// add the state command if no empty
if (stateChange != NULL)
newCommands = insertAllAfterLList(newCommands, XGCCommand_createStateCommands(stateChange));
// is it the last frame ?
if (com == NULL)
{
// loop point ?
if (loopOffset != -1)
newCommands = insertAfterLList(newCommands, XGMCommand_createLoopCommand(loopOffset));
else
// add end command
newCommands = insertAfterLList(newCommands, XGMCommand_createEndCommand());
}
// get back to head
newCommands = getHeadLList(newCommands);
// limit frame commands to 255 bytes max
size = 0;
tmpCom = newCommands;
while(tmpCom != NULL)
{
XGMCommand* command = tmpCom->element;
// limit reached ?
if ((size + command->size) >= 256)
{
// if ((frameInd > 10) && (!silent))
if (!silent)
{
int frameInd = XGC_computeLenInFrameOf(getHeadLList(xgcCommands)) + (XGC_computeLenInFrameOf(newCommands) - 1);
printf("Warning: frame > 256 at frame %4X (need to split frame)\n", frameInd);
}
// end previous frame
XGCCommand_setFrameSizeSize(sizeCommand, size);
// insert new frame size info
sizeCommand = XGCCommand_createFrameSizeCommand(0);
insertBeforeLList(tmpCom, sizeCommand);
// reset size and pass to next element
size = 1;
}
size += command->size;
tmpCom = tmpCom->next;
}
// set frame size
XGCCommand_setFrameSizeSize(sizeCommand, size);
// finally add the new commands
xgcCommands = insertAllAfterLList(xgcCommands, newCommands);
}
xgc->commands = getHeadLList(xgcCommands);
// compute offset & frame size
XGC_computeAllOffset(xgc);
XGC_computeAllFrameSize(xgc);
if (!silent)
printf("Number of command: %d\n", getSizeLList(xgc->commands));
}
