ref: 46becee7d2a7ecfcd1bdedaa1b07c84deeec5a84
dir: /src/modloaders/ft2_load_stk.c/
/* Ultimate SoundTracker (or compatible) STK loader
**
** Note: Data sanitation is done in the last stage
** of module loading, so you don't need to do that here.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include "../ft2_header.h"
#include "../ft2_module_loader.h"
#include "../ft2_sample_ed.h"
#include "../ft2_tables.h"
#include "../ft2_sysreqs.h"
#ifdef _MSC_VER // please don't mess with this struct!
#pragma pack(push)
#pragma pack(1)
#endif
typedef struct stkHdr_t
{
char name[20];
modSmpHdr_t smp[15];
uint8_t numOrders, CIAVal, orders[128];
}
#ifdef __GNUC__
__attribute__ ((packed))
#endif
stkHdr_t;
#ifdef _MSC_VER
#pragma pack(pop)
#endif
bool loadSTK(FILE *f, uint32_t filesize)
{
uint8_t bytes[4];
int16_t i, j, k;
uint16_t a, b;
sample_t *s;
stkHdr_t h;
tmpLinearPeriodsFlag = false; // use Amiga periods
bool veryLateSTKVerFlag = false; // "DFJ SoundTracker III" nad later
bool lateSTKVerFlag = false; // "TJC SoundTracker II" and later
if (filesize < sizeof (h))
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
memset(&h, 0, sizeof (stkHdr_t));
if (fread(&h, 1, sizeof (h), f) != sizeof (h))
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
if (h.CIAVal == 0) // a CIA value of 0 results in 120
h.CIAVal = 120;
if (h.numOrders < 1 || h.numOrders > 128 || h.CIAVal > 220)
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
memcpy(songTmp.orders, h.orders, 128);
songTmp.numChannels = 4;
songTmp.songLength = h.numOrders;
songTmp.BPM = 125;
songTmp.speed = 6;
for (a = 0; a < 15; a++)
{
modSmpHdr_t *modSmp = &h.smp[a];
memcpy(songTmp.instrName[1+a], modSmp->name, 22);
/* Only late versions of Ultimate SoundTracker supports samples larger than 9999 bytes.
** If found, we know for sure that this is a late STK module.
*/
const int32_t sampleLen = 2*SWAP16(modSmp->length);
if (sampleLen > 9999)
lateSTKVerFlag = true;
}
// jjk55.mod by Jesper Kyd has a bogus STK tempo value that should be ignored (hackish!)
if (!strcmp("jjk55", h.name))
h.CIAVal = 120;
if (h.CIAVal != 120) // 120 is a special case and means 50Hz (125BPM)
{
if (h.CIAVal > 220)
h.CIAVal = 220;
// convert UST tempo to BPM
uint16_t ciaPeriod = (240 - h.CIAVal) * 122;
double dHz = 709379.0 / (ciaPeriod+1); // +1, CIA triggers on underflow
songTmp.BPM = (uint16_t)((dHz * (125.0 / 50.0)) + 0.5);
}
memcpy(songTmp.name, h.name, 20);
// count number of patterns
b = 0;
for (a = 0; a < 128; a++)
{
if (songTmp.orders[a] > b)
b = songTmp.orders[a];
}
b++;
for (a = 0; a < b; a++)
{
if (!allocateTmpPatt(a, 64))
{
loaderMsgBox("Not enough memory!");
return false;
}
for (j = 0; j < 64; j++)
{
for (k = 0; k < songTmp.numChannels; k++)
{
note_t *p = &patternTmp[a][(j * MAX_CHANNELS) + k];
if (fread(bytes, 1, 4, f) != 4)
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
// period to note
uint16_t period = ((bytes[0] & 0x0F) << 8) | bytes[1];
for (i = 0; i < 3*12; i++)
{
if (period >= ptPeriods[i])
{
p->note = 1 + (3*12) + (uint8_t)i;
break;
}
}
p->instr = (bytes[0] & 0xF0) | (bytes[2] >> 4);
p->efx = bytes[2] & 0x0F;
p->efxData = bytes[3];
if (p->efx == 0xC || p->efx == 0xD || p->efx == 0xE)
{
// "TJC SoundTracker II" and later
lateSTKVerFlag = true;
}
if (p->efx == 0xF)
{
// "DFJ SoundTracker III" and later
lateSTKVerFlag = true;
veryLateSTKVerFlag = true;
}
if (p->efx == 0xC)
{
if (p->efxData > 64)
p->efxData = 64;
}
else if (p->efx == 0x1)
{
if (p->efxData == 0)
p->efxData = 0;
}
else if (p->efx == 0x2)
{
if (p->efxData == 0)
p->efxData = 0;
}
else if (p->efx == 0x5)
{
if (p->efxData == 0)
p->efxData = 0x3;
}
else if (p->efx == 0x6)
{
if (p->efxData == 0)
p->efxData = 0x4;
}
else if (p->efx == 0xA)
{
if (p->efxData == 0)
p->efxData = 0;
}
else if (p->efx == 0xE)
{
// check if certain E commands are empty
if (p->efxData == 0x10 || p->efxData == 0x20 || p->efxData == 0xA0 || p->efxData == 0xB0)
{
p->efx = 0;
p->efxData = 0;
}
}
}
}
if (tmpPatternEmpty(a))
{
if (patternTmp[a] != NULL)
{
free(patternTmp[a]);
patternTmp[a] = NULL;
}
}
}
// pattern command conversion for non-PT formats
for (a = 0; a < b; a++)
{
if (patternTmp[a] == NULL)
continue;
for (j = 0; j < 64; j++)
{
for (k = 0; k < songTmp.numChannels; k++)
{
note_t *p = &patternTmp[a][(j * MAX_CHANNELS) + k];
// convert STK effects to PT effects
if (!lateSTKVerFlag)
{
// old SoundTracker 1.x commands
if (p->efx == 1)
{
// arpeggio
p->efx = 0;
}
else if (p->efx == 2)
{
// pitch slide
if (p->efxData & 0xF0)
{
// pitch slide down
p->efx = 2;
p->efxData >>= 4;
}
else if (p->efxData & 0x0F)
{
// pitch slide up
p->efx = 1;
}
}
}
else
{
// "DFJ SoundTracker II" or later
if (p->efx == 0xD)
{
if (veryLateSTKVerFlag) // "DFJ SoundTracker III" or later
{
// pattern break w/ no param (param must be cleared to fix some songs)
p->efxData = 0;
}
else
{
// volume slide
p->efx = 0xA;
}
}
}
// effect F with param 0x00 does nothing in UST/STK (I think)
if (p->efx == 0xF && p->efxData == 0)
p->efx = 0;
}
}
}
for (a = 0; a < 15; a++)
{
if (h.smp[a].length == 0)
continue;
if (!allocateTmpInstr(1+a))
{
loaderMsgBox("Not enough memory!");
return false;
}
setNoEnvelope(instrTmp[1+a]);
s = &instrTmp[1+a]->smp[0];
s->volume = h.smp[a].volume;
s->length = 2 * SWAP16(h.smp[a].length);
s->loopStart = SWAP16(h.smp[a].loopStart); // in STK, loopStart = bytes, not words
s->loopLength = 2 * SWAP16(h.smp[a].loopLength);
if (s->loopLength < 2)
s->loopLength = 2;
// fix overflown loop
if (s->loopStart+s->loopLength > s->length)
{
if (s->loopStart >= s->length)
{
s->loopStart = 0;
s->loopLength = 0;
}
else
{
s->loopLength = s->length - s->loopStart;
}
}
if (s->loopStart+s->loopLength > 2)
{
s->flags |= LOOP_FWD; // enable loop
}
else
{
s->loopLength = 0;
s->loopStart = 0;
}
/* In STK, only the loop area of a looped sample is played.
** Skip loading of eventual data present before loop start.
*/
if (s->loopStart > 0 && s->loopLength < s->length)
{
s->length -= s->loopStart;
fseek(f, s->loopStart, SEEK_CUR);
s->loopStart = 0;
}
if (!allocateSmpData(s, s->length, false))
{
loaderMsgBox("Not enough memory!");
return false;
}
int32_t bytesRead = (int32_t)fread(s->dataPtr, 1, s->length, f);
if (bytesRead < s->length)
{
int32_t bytesToClear = s->length - bytesRead;
memset(&s->dataPtr[bytesRead], 0, bytesToClear);
}
}
return true;
}