static XGMCommand* XGMCommand_createYMPort1Command(LList** pcommands)
{
LList* curCom = *pcommands;
const int size = min(16, getSizeLList(curCom));
unsigned char* data = malloc((size * 2) + 1);
int i, off;
data[0] = XGM_YM2612_PORT1 | (size - 1);
off = 1;
for (i = 0; i < size; i++)
{
VGMCommand* command = curCom->element;
data[off++] = VGMCommand_getYM2612Register(command);
data[off++] = VGMCommand_getYM2612Value(command);
curCom = curCom->next;
}
// update list pointer to remove elements we have done
*pcommands = curCom;
return XGMCommand_create(data, (size * 2) + 1);
}
XGMCommand* XGMCommand_createFromData(unsigned char* data)
{
unsigned char command = *data;
unsigned char size = command & 0xF;
// default
int comSize = 1;
switch(command & 0xF0)
{
case XGM_PSG:
case XGM_YM2612_REGKEY:
comSize += size + 1;
break;
case XGM_YM2612_PORT0:
case XGM_YM2612_PORT1:
comSize += (size + 1) * 2;
break;
case XGM_PCM:
comSize = 2;
break;
case 0x70:
// LOOP
if (size == 0xE)
comSize = 4;
break;
}
return XGMCommand_create(data, comSize);
}
XGMCommand* XGMCommand_createEndCommand()
{
unsigned char* data = malloc(1);
data[0] = XGM_END;
return XGMCommand_create(data, 1);
}
XGMCommand* XGMCommand_createFrameCommand()
{
unsigned char* data = malloc(1);
data[0] = XGM_FRAME;
return XGMCommand_create(data, 1);
}
XGMCommand* XGMCommand_createLoopCommand(int offset)
{
unsigned char* data = malloc(4);
data[0] = XGM_LOOP;
data[1] = offset >> 0;
data[2] = offset >> 8;
data[3] = offset >> 16;
return XGMCommand_create(data, 4);
}
static XGMCommand* XGMCommand_createPSGCommand(List* commands, int* offset)
{
const int size = min(16, commands->size - *offset);
unsigned char* data = malloc(size + 1);
int i, off;
data[0] = XGM_PSG | (size - 1);
off = 1;
for (i = 0; i < size; i++)
data[off++] = VGMCommand_getPSGValue(getFromList(commands, i + *offset));
// remove elements we have done
*offset += size;
return XGMCommand_create(data, size + 1);
}
XGMCommand* XGMCommand_createYMKeyCommand(List* commands, int* offset, int max)
{
const int size = min(max, commands->size - *offset);
unsigned char* data = malloc(size + 1);
int i, off;
data[0] = XGM_YM2612_REGKEY | (size - 1);
off = 1;
for (i = 0; i < size; i++)
data[off++] = VGMCommand_getYM2612Value(getFromList(commands, i + *offset));
// remove elements we have done
*offset += size;
return XGMCommand_create(data, size + 1);
}
static XGMCommand* XGMCommand_createPSGCommand(LList** pcommands)
{
LList* curCom = *pcommands;
const int size = min(16, getSizeLList(curCom));
unsigned char* data = malloc(size + 1);
int i, off;
data[0] = XGM_PSG | (size - 1);
off = 1;
for (i = 0; i < size; i++)
{
data[off++] = VGMCommand_getPSGValue(curCom->element);
curCom = curCom->next;
}
// update list pointer to remove elements we have done
*pcommands = curCom;
return XGMCommand_create(data, size + 1);
}
XGMCommand* XGMCommand_createYMKeyCommand(LList** pcommands, int max)
{
LList* curCom = *pcommands;
const int size = min(max, getSizeLList(curCom));
unsigned char* data = malloc(size + 1);
int i, off;
data[0] = XGM_YM2612_REGKEY | (size - 1);
off = 1;
for (i = 0; i < size; i++)
{
data[off++] = VGMCommand_getYM2612Value(curCom->element);
curCom = curCom->next;
}
// update list pointer to remove elements we have done
*pcommands = curCom;
return XGMCommand_create(data, size + 1);
}
static XGMCommand* XGMCommand_createYMPort1Command(List* commands, int* offset)
{
const int size = min(16, commands->size - *offset);
unsigned char* data = malloc((size * 2) + 1);
int i, off;
data[0] = XGM_YM2612_PORT1 | (size - 1);
off = 1;
for (i = 0; i < size; i++)
{
VGMCommand* command = getFromList(commands, i + *offset);
data[off++] = VGMCommand_getYM2612Register(command);
data[off++] = VGMCommand_getYM2612Value(command);
}
// remove elements we have done
*offset += size;
return XGMCommand_create(data, (size * 2) + 1);
}
static XGMCommand* XGMCommand_createPCMCommand(XGM* xgm, VGM* vgm, VGMCommand* command, int channel)
{
unsigned char* data = malloc(2);
XGMSample* xgmSample;
unsigned char prio;
data[0] = XGM_PCM;
prio = 0;
if (VGMCommand_isStreamStartLong(command))
{
int address;
int size;
Sample* vgmSample;
address = VGMCommand_getStreamSampleAddress(command);
size = VGMCommand_getStreamSampleSize(command);
// vgmSample = VGM_getSample(vgm, address, size);
vgmSample = VGM_getSample(vgm, address);
// use stream id as priority
prio = 3 - (VGMCommand_getStreamId(command) & 0x3);
xgmSample = XGM_getSampleByAddress(xgm, address);
if (vgmSample != NULL)
{
double len;
int lenInFrame;
len = VGMCommand_getStreamSampleSize(command);
lenInFrame = ceil(len / ((double) vgmSample->rate / (double) vgm->rate));
}
else if (!silent)
printf("Warning: can't find original VGM sample for VGM command at offset %6X\n", command->offset);
}
else if (VGMCommand_isStreamStart(command))
{
// use stream id as priority
prio = 3 - (VGMCommand_getStreamId(command) & 0x3);
xgmSample = XGM_getSampleByIndex(xgm, VGMCommand_getStreamBlockId(command) + 1);
if (xgmSample == NULL)
xgmSample = XGM_getSampleByIndex(xgm, prio + 1);
}
else if (VGMCommand_isStreamStop(command))
{
// use stream id as priority
prio = 3 - (VGMCommand_getStreamId(command) & 0x3);
// stop command
data[1] = 0;
return XGMCommand_create(data, 2);
}
else
{
// assume stop command by default
data[1] = 0;
return XGMCommand_create(data, 2);
}
// no sample found --> use empty sample
if (xgmSample == NULL)
{
if (!silent)
printf("Warning: no corresponding sample found for VGM command at offset %6X in XGM\n", command->offset);
data[1] = 0;
}
else
data[1] = xgmSample->index;
// channel == -1 --> we use inverse of priority for channel
if (channel == -1)
data[0] |= 3 - prio;
else
data[0] |= (channel & 0x3);
// set prio
data[0] |= prio << 2;
return XGMCommand_create(data, 2);
}