XGM* XGM_createFromData(unsigned char* data, int dataSize)
{
int s;
XGM* result = XGM_create();
if (!silent)
printf("Parsing XGM file...\n");
if (strncasecmp(&data[0x00], "XGM ", 4))
{
printf("Error: XGM file not recognized !\n");
return NULL;
}
// sample id table
LList* samples = NULL;
for (s = 1; s < 0x40; s++)
{
int offset = getInt16(data, (s * 4) + 0);
int len = getInt16(data, (s * 4) + 2);
// ignore empty sample
if ((offset != 0xFFFF) && (len != 0x0100))
{
offset <<= 8;
len <<= 8;
// add sample
samples = insertAfterLList(samples, XGMSample_create(s, data + (offset + 0x104), len, offset));
}
}
result->samples = getHeadLList(samples);
// calculate music data offset (sample block size + 0x104)
int offset = (getInt16(data, 0x100) << 8) + 0x104;
// int version = data[0x102];
result->pal = data[0x103] & 1;
// get music data length
int len = getInt(data, offset);
if (verbose)
{
printf("XGM sample number: %d\n", getSizeLList(result->samples));
printf("XGM start music data: %6X len: %d\n", offset + 4, len);
}
// build command list
XGM_parseMusic(result, data + offset + 4, len);
if (!silent)
printf("XGM duration: %d frames (%d seconds)\n", XGM_computeLenInFrame(result), XGM_computeLenInSecond(result));
// GD3 tags ?
if (data[0x103] & 2)
result->gd3 = GD3_createFromData(data + offset + 4 + len);
return result;
}
XGMSample* XGMSample_createFromVGMSample(SampleBank* bank, Sample* sample)
{
int dataSize;
unsigned char* data;
// invalid sample
if (sample->rate == 0)
return NULL;
data = resample(bank->data, bank->offset + sample->dataOffset + 7, sample->len - 1, sample->rate, 14000, 256, &dataSize);
// index should be modified when inserted in sample list
XGMSample* result = XGMSample_create(0, data, dataSize, sample->dataOffset);
return result;
}
