ref: 3e7b18472cba687a04f6cd9be66ad531ed24283c
dir: /src/modloaders/ft2_load_stk.c/
// Ultimate SoundTracker (or compatible) STK loader
#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 songMOD15HeaderTyp_t
{
char name[20];
songMODInstrHeaderTyp instr[15];
uint8_t len, CIAVal, songTab[128];
}
#ifdef __GNUC__
__attribute__ ((packed))
#endif
songMOD15HeaderTyp;
#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, period;
tonTyp *ton;
sampleTyp *s;
songMOD15HeaderTyp h_MOD15;
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_MOD15))
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
memset(&h_MOD15, 0, sizeof (songMOD15HeaderTyp));
if (fread(&h_MOD15, 1, sizeof (h_MOD15), f) != sizeof (h_MOD15))
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
if (h_MOD15.CIAVal == 0) // a CIA value of 0 results in 120
h_MOD15.CIAVal = 120;
songTmp.antChn = 4;
songTmp.len = h_MOD15.len;
songTmp.speed = 125;
songTmp.initialTempo = songTmp.tempo = 6;
memcpy(songTmp.songTab, h_MOD15.songTab, 128);
if (songTmp.len < 1 || songTmp.len > 128 || h_MOD15.CIAVal > 220)
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
for (a = 0; a < 15; a++)
{
songMODInstrHeaderTyp *smp = &h_MOD15.instr[a];
memcpy(songTmp.instrName[1+a], smp->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(smp->len);
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_MOD15.name))
h_MOD15.CIAVal = 120;
if (h_MOD15.CIAVal != 120) // 120 is a special case and means 50Hz (125BPM)
{
// convert UST tempo to BPM
uint16_t ciaPeriod = (240 - h_MOD15.CIAVal) * 122;
double dHz = 709379.0 / ciaPeriod;
int32_t BPM = (int32_t)((dHz * 2.5) + 0.5);
songTmp.speed = (uint16_t)BPM;
}
memcpy(songTmp.name, h_MOD15.name, 20);
// count number of patterns
b = 0;
for (a = 0; a < 128; a++)
{
if (songTmp.songTab[a] > b)
b = songTmp.songTab[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.antChn; k++)
{
ton = &pattTmp[a][(j * MAX_VOICES) + 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
period = ((bytes[0] & 0x0F) << 8) | bytes[1];
for (i = 0; i < 3*12; i++)
{
if (period >= ptPeriods[i])
{
ton->ton = 1 + (3*12) + (uint8_t)i;
break;
}
}
ton->instr = (bytes[0] & 0xF0) | (bytes[2] >> 4);
ton->effTyp = bytes[2] & 0x0F;
ton->eff = bytes[3];
if (ton->effTyp == 0xC || ton->effTyp == 0xD || ton->effTyp == 0xE)
{
// "TJC SoundTracker II" and later
lateSTKVerFlag = true;
}
if (ton->effTyp == 0xF)
{
// "DFJ SoundTracker III" and later
lateSTKVerFlag = true;
veryLateSTKVerFlag = true;
}
if (ton->effTyp == 0xC)
{
if (ton->eff > 64)
ton->eff = 64;
}
else if (ton->effTyp == 0x1)
{
if (ton->eff == 0)
ton->effTyp = 0;
}
else if (ton->effTyp == 0x2)
{
if (ton->eff == 0)
ton->effTyp = 0;
}
else if (ton->effTyp == 0x5)
{
if (ton->eff == 0)
ton->effTyp = 0x3;
}
else if (ton->effTyp == 0x6)
{
if (ton->eff == 0)
ton->effTyp = 0x4;
}
else if (ton->effTyp == 0xA)
{
if (ton->eff == 0)
ton->effTyp = 0;
}
else if (ton->effTyp == 0xE)
{
// check if certain E commands are empty
if (ton->eff == 0x10 || ton->eff == 0x20 || ton->eff == 0xA0 || ton->eff == 0xB0)
{
ton->effTyp = 0;
ton->eff = 0;
}
}
}
}
if (tmpPatternEmpty(a))
{
if (pattTmp[a] != NULL)
{
free(pattTmp[a]);
pattTmp[a] = NULL;
}
}
}
// pattern command conversion for non-PT formats
for (a = 0; a < b; a++)
{
if (pattTmp[a] == NULL)
continue;
for (j = 0; j < 64; j++)
{
for (k = 0; k < songTmp.antChn; k++)
{
ton = &pattTmp[a][(j * MAX_VOICES) + k];
// convert STK effects to PT effects
if (!lateSTKVerFlag)
{
// old SoundTracker 1.x commands
if (ton->effTyp == 1)
{
// arpeggio
ton->effTyp = 0;
}
else if (ton->effTyp == 2)
{
// pitch slide
if (ton->eff & 0xF0)
{
// pitch slide down
ton->effTyp = 2;
ton->eff >>= 4;
}
else if (ton->eff & 0x0F)
{
// pitch slide up
ton->effTyp = 1;
}
}
}
else
{
// "DFJ SoundTracker II" or later
if (ton->effTyp == 0xD)
{
if (veryLateSTKVerFlag) // "DFJ SoundTracker III" or later
{
// pattern break w/ no param (param must be cleared to fix some songs)
ton->eff = 0;
}
else
{
// volume slide
ton->effTyp = 0xA;
}
}
}
// effect F with param 0x00 does nothing in UST/STK (I think)
if (ton->effTyp == 0xF && ton->eff == 0)
ton->effTyp = 0;
}
}
}
for (a = 0; a < 15; a++)
{
if (h_MOD15.instr[a].len == 0)
continue;
if (!allocateTmpInstr(1+a))
{
loaderMsgBox("Not enough memory!");
return false;
}
setNoEnvelope(instrTmp[1+a]);
s = &instrTmp[1+a]->samp[0];
s->vol = h_MOD15.instr[a].vol;
s->len = 2 * SWAP16(h_MOD15.instr[a].len);
s->repS = SWAP16(h_MOD15.instr[a].repS); // in STK, loopStart = bytes, not words
s->repL = 2 * SWAP16(h_MOD15.instr[a].repL);
if (s->vol > 64)
s->vol = 64;
if (s->repL < 2)
s->repL = 2;
// fix overflown loop
if (s->repS+s->repL > s->len)
{
if (s->repS >= s->len)
{
s->repS = 0;
s->repL = 0;
}
else
{
s->repL = s->len - s->repS;
}
}
if (s->repS+s->repL > 2)
{
s->typ = 1; // enable loop
}
else
{
s->repL = 0;
s->repS = 0;
}
/* In STK, only the loop area of a looped sample is played.
** Skip loading of eventual data present before loop start.
*/
if (s->repS > 0 && s->repL < s->len)
{
s->len -= s->repS;
fseek(f, s->repS, SEEK_CUR);
s->repS = 0;
}
if (!allocateTmpSmpData(s, s->len))
{
loaderMsgBox("Not enough memory!");
return false;
}
int32_t bytesRead = (int32_t)fread(s->pek, 1, s->len, f);
if (bytesRead < s->len)
{
int32_t bytesToClear = s->len - bytesRead;
memset(&s->pek[bytesRead], 0, bytesToClear);
}
}
return true;
}