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load_pat.cpp
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/*
MikMod Sound System
By Jake Stine of Divine Entertainment (1996-2000)
Support:
If you find problems with this code, send mail to:
Distribution / Code rights:
Use this source code in any fashion you see fit. Giving me credit where
credit is due is optional, depending on your own levels of integrity and
honesty.
-----------------------------------------
Module: LOAD_PAT
PAT sample loader.
by Peter Grootswagers (2006)
<email:[email protected]>
It's primary purpose is loading samples for the .abc and .mid modules
Can also be used stand alone, in that case a tune (frere Jacques)
is generated using al samples available in the .pat file
Portability:
All systems - all compilers (hopefully)
*/
#include <string>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
#ifndef _WIN32
#include <limits.h> // for PATH_MAX
#include <unistd.h> // for sleep
#endif
#ifndef PATH_MAX
#define PATH_MAX 256
#endif
#include "stdafx.h"
#include "sndfile.h"
#include "load_pat.h"
#define DIRDELIM '/'
#ifndef PAT_CONFIG_FILE
//#define PAT_CONFIG_FILE "FluidR3_GM2/FluidR3_GM2-2.cfg"
#define PAT_CONFIG_FILE "pat/timidity.cfg"
#endif
#ifndef PAT_CONFIG_DRUM_OFFSET
#define PAT_CONFIG_DRUM_OFFSET 25 // timidity.cfg drum patches start at 25
#endif
#ifndef PAT_ENV_PATH2CFG
#define PAT_ENV_PATH2CFG "MMPAT_PATH_TO_CFG"
#endif
// 128 gm and 63 drum
#define MAXSMP 191
static char midipat[MAXSMP][PATH_MAX];
static char pathforpat[PATH_MAX] = {};
static char timiditycfg[PATH_MAX] = {};
#pragma pack(1)
typedef struct {
char header[12]; // ascizz GF1PATCH110
char gravis_id[10]; // allways ID#000002
char description[60];
BYTE instruments;
BYTE voices;
BYTE channels;
WORD waveforms;
WORD master_volume;
DWORD data_size;
char reserved[36];
} PatchHeader;
typedef struct {
WORD instrument_id;
char instrument_name[16];
DWORD instrument_size;
BYTE layers;
char reserved[40];
} InstrumentHeader;
typedef struct {
BYTE layer_dup;
BYTE layer_id;
DWORD layer_size;
BYTE samples;
char reserved[40];
} LayerHeader;
typedef struct {
char wave_name[7];
BYTE fractions;
DWORD wave_size;
DWORD start_loop;
DWORD end_loop;
WORD sample_rate;
DWORD low_frequency ;
DWORD high_frequency;
DWORD root_frequency;
short int tune;
BYTE balance;
BYTE envelope_rate[6];
BYTE envelope_offset[6];
BYTE tremolo_sweep;
BYTE tremolo_rate;
BYTE tremolo_depth;
BYTE vibrato_sweep;
BYTE vibrato_rate;
BYTE vibrato_depth;
BYTE modes;
DWORD scale_frequency;
DWORD scale_factor;
char reserved[32];
} WaveHeader;
// WaveHeader.modes bits
#define PAT_16BIT 1
#define PAT_UNSIGNED 2
#define PAT_LOOP 4
#define PAT_PINGPONG 8
#define PAT_BACKWARD 16
#define PAT_SUSTAIN 32
#define PAT_ENVELOPE 64
#define PAT_CLAMPED 128
#define C4SPD 8363
#define C4mHz 523251
#define C4 523.251f
#define PI 3.141592653589793f
#define OMEGA ((2.0f * PI * C4)/(float)C4SPD)
/**********************************************************************/
static BYTE pat_gm_used[MAXSMP];
static BYTE pat_loops[MAXSMP];
/**********************************************************************/
typedef struct _PATHANDLE
{
char patname[16];
int samples;
} PATHANDLE;
#ifndef HAVE_SINF
static inline float sinf(float x) {
/* default to double version */
return((float)sin((double)x));
}
#endif
// local prototypes
static int pat_getopt(const char *s, const char *o, int dflt);
static void pat_message(const char *s1, const char *s2)
{
char txt[256];
if( strlen(s1) + strlen(s2) > 255 ) return;
sprintf(txt, s1, s2);
fprintf(stderr, "load_pat > %s\n", txt);
}
void pat_resetsmp(void)
{
int i;
for( i=0; i<MAXSMP; i++ ) {
pat_loops[i] = 0;
pat_gm_used[i] = 0;
}
}
int pat_numsmp()
{
return strlen((const char *)pat_gm_used);
}
int pat_numinstr(void)
{
return strlen((const char *)pat_gm_used);
}
int pat_smptogm(int smp)
{
if( smp < MAXSMP )
return pat_gm_used[smp - 1];
return 1;
}
int pat_gmtosmp(int gm)
{
int smp;
for( smp=0; pat_gm_used[smp]; smp++ )
if( pat_gm_used[smp] == gm )
return smp+1;
if( smp < MAXSMP ) {
pat_gm_used[smp] = gm;
return smp+1;
}
return 1;
}
int pat_smplooped(int smp)
{
if( smp < MAXSMP ) return pat_loops[smp - 1];
return 1;
}
const char *pat_gm_name(int gm)
{
static char buf[40];
if( gm < 1 || gm > MAXSMP ) {
sprintf(buf, "invalid gm %d", gm);
return buf;
}
return midipat[gm - 1];
}
int pat_gm_drumnr(int n)
{
if( n < 25 ) return 129;
if( n+129-25 < MAXSMP )
return 129+n-PAT_CONFIG_DRUM_OFFSET;
return MAXSMP;
}
int pat_gm_drumnote(int n)
{
char *p;
p = strchr(midipat[pat_gm_drumnr(n)-1], ':');
if( p ) return pat_getopt(p+1, "note", n);
return n;
}
static float pat_sinus(int i)
{
float res = sinf(OMEGA * (float)i);
return res;
}
static float pat_square(int i)
{
float res = 30.0f * sinf(OMEGA * (float)i);
if( res > 0.99f ) return 0.99f;
if( res < -0.99f ) return -0.99f;
return res;
}
static float pat_sawtooth(int i)
{
float res = OMEGA * (float)i;
while( res > 2 * PI )
res -= 2 * PI;
i = 2;
if( res > PI ) {
res = PI - res;
i = -2;
}
res = (float)i * res / PI;
if( res > 0.9f ) return 1.0f - res;
if( res < -0.9f ) return 1.0f + res;
return res;
}
typedef float (*PAT_SAMPLE_FUN)(int);
static PAT_SAMPLE_FUN pat_fun[] = { pat_sinus, pat_square, pat_sawtooth };
#if defined(WIN32) && defined(_mm_free)
#undef _mm_free
#endif
#define MMSTREAM FILE
#define _mm_fopen(name,mode) fopen(name,mode)
#define _mm_fgets(f,buf,sz) fgets(buf,sz,f)
#define _mm_fseek(f,pos,whence) fseek(f,pos,whence)
#define _mm_ftell(f) ftell(f)
#define _mm_read_UBYTES(buf,sz,f) fread(buf,sz,1,f)
#define _mm_read_SBYTES(buf,sz,f) fread(buf,sz,1,f)
#define _mm_feof(f) feof(f)
#define _mm_fclose(f) fclose(f)
#define DupStr(h,buf,sz) strdup(buf)
#define _mm_calloc(h,n,sz) calloc(n,sz)
#define _mm_recalloc(h,buf,sz,elsz) realloc(buf,sz)
#define _mm_free(h,p) free(p)
typedef struct {
char *mm;
int sz;
int pos;
int error;
} MMFILE;
static long mmftell(MMFILE *mmfile)
{
return mmfile->pos;
}
static void mmfseek(MMFILE *mmfile, long p, int whence)
{
int newpos = mmfile->pos;
switch(whence) {
case SEEK_SET:
newpos = p;
break;
case SEEK_CUR:
newpos += p;
break;
case SEEK_END:
newpos = mmfile->sz + p;
break;
}
if (newpos < mmfile->sz)
mmfile->pos = newpos;
else {
mmfile->error = 1;
// printf("WARNING: seeking too far\n");
}
}
static void mmreadUBYTES(BYTE *buf, long sz, MMFILE *mmfile)
{
int sztr = sz;
// do not overread.
if (sz > mmfile->sz - mmfile->pos)
sztr = mmfile->sz - mmfile->pos;
memcpy(buf, &mmfile->mm[mmfile->pos], sztr);
mmfile->pos += sz;
// if truncated read, populate the rest of the array with zeros.
if (sz > sztr)
memset(buf+sztr, 0, sz-sztr);
}
static void mmreadSBYTES(char *buf, long sz, MMFILE *mmfile)
{
// do not overread.
if (sz > mmfile->sz - mmfile->pos)
sz = mmfile->sz - mmfile->pos;
memcpy(buf, &mmfile->mm[mmfile->pos], sz);
mmfile->pos += sz;
}
long _mm_getfsize(MMSTREAM *mmpat) {
long fsize;
_mm_fseek(mmpat, 0L, SEEK_END);
fsize = _mm_ftell(mmpat);
_mm_fseek(mmpat, 0L, SEEK_SET);
return(fsize);
}
void pat_init_patnames(void)
{
int z, i, nsources, isdrumset, nskip, pfnlen;
char *p, *q;
char line[PATH_MAX];
char cfgsources[5][PATH_MAX] = {{0}, {0}, {0}, {0}, {0}};
MMSTREAM *mmcfg;
strncpy(timiditycfg, PAT_CONFIG_FILE, PATH_MAX);
p = getenv(PAT_ENV_PATH2CFG);
if( p ) {
strncpy(timiditycfg, p, PATH_MAX);
}
{
std::string normalized(timiditycfg);
for( size_t i = 0; i < normalized.size(); ++i ) {
if( normalized[i] == '\\' ) normalized[i] = '/';
}
strcat(pathforpat, normalized.substr(0, normalized.find_last_of('/') + 1).c_str() );
}
strncpy(cfgsources[0], timiditycfg, PATH_MAX - 1);
nsources = 1;
for( i=0; i<MAXSMP; i++ ) midipat[i][0] = '\0';
for ( z=0; z<5; z++ ) {
if (cfgsources[z][0] == 0) continue;
mmcfg = _mm_fopen(cfgsources[z],"r");
if( !mmcfg ) {
pat_message("can not open %s, use environment variable " PAT_ENV_PATH2CFG " for the directory", cfgsources[z]);
}
else {
// read in bank 0 and drum patches
isdrumset = 0;
_mm_fgets(mmcfg, line, PATH_MAX);
while( !_mm_feof(mmcfg) ) {
if( isdigit(line[0]) || (isblank(line[0]) && isdigit(line[1])) ) {
p = line;
// get pat number
while ( isspace(*p) ) p ++;
i = atoi(p);
while ( isdigit(*p) ) p ++;
while ( isspace(*p) ) p ++;
// get pat file name
if( *p && i < MAXSMP && i >= 0 && *p != '#' ) {
q = isdrumset ? midipat[pat_gm_drumnr(i)-1] : midipat[i];
pfnlen = 0;
while( *p && !isspace(*p) && *p != '#' && pfnlen < 128 ) {
pfnlen ++;
*q++ = *p++;
}
if( isblank(*p) && *(p+1) != '#' && pfnlen < 128 ) {
*q++ = ':'; pfnlen ++;
while( isspace(*p) ) {
while( isspace(*p) ) p++;
if ( *p == '#' ) { // comment
} else while( *p && !isspace(*p) && pfnlen < 128 ) {
pfnlen ++;
*q++ = *p++;
}
if( isspace(*p) ) { *q++ = ' '; pfnlen++; }
}
}
*q++ = '\0';
}
}
if( !strncmp(line,"drumset",7) ) isdrumset = 1;
if( !strncmp(line,"source",6) && nsources < 5 ) {
q = cfgsources[nsources];
p = &line[7];
while ( isspace(*p) ) p ++;
pfnlen = 0;
while ( *p && *p != '#' && !isspace(*p) && pfnlen < 128 ) {
pfnlen ++;
*q++ = *p++;
}
*q = 0; // null termination
nsources++;
}
_mm_fgets(mmcfg, line, PATH_MAX);
} /* end file parsing */
_mm_fclose(mmcfg);
}
}
q = midipat[0];
nskip = 0;
// make all empty patches duplicates the previous valid one.
for( i=0; i<MAXSMP; i++ ) {
if( midipat[i][0] ) q = midipat[i];
else {
if( midipat[i] != q)
strcpy(midipat[i], q);
if( midipat[i][0] == '\0' ) nskip++;
}
}
if( nskip ) {
for( i=MAXSMP; i-- > 0; ) {
if( midipat[i][0] ) q = midipat[i];
else if( midipat[i] != q )
strcpy(midipat[i], q);
}
}
}
static char *pat_build_path(char *fname, int pat)
{
char *ps;
char *patfile = midipat[pat];
int isabspath = (patfile[0] == '/');
if ( isabspath ) patfile ++;
ps = strrchr(patfile, ':');
if( ps ) {
sprintf(fname, "%s%c%s", isabspath ? "" : pathforpat, DIRDELIM, patfile);
strcpy(strrchr(fname, ':'), ".pat");
return ps;
}
sprintf(fname, "%s%c%s.pat", isabspath ? "" : pathforpat, DIRDELIM, patfile);
return 0;
}
static void pat_read_patname(PATHANDLE *h, MMFILE *mmpat) {
InstrumentHeader ih;
mmfseek(mmpat,sizeof(PatchHeader), SEEK_SET);
mmreadUBYTES((BYTE *)&ih, sizeof(InstrumentHeader), mmpat);
strncpy(h->patname, ih.instrument_name, 16);
h->patname[15] = '\0';
}
static void pat_read_layerheader(MMSTREAM *mmpat, LayerHeader *hl)
{
_mm_fseek(mmpat,sizeof(PatchHeader)+sizeof(InstrumentHeader), SEEK_SET);
_mm_read_UBYTES((BYTE *)hl, sizeof(LayerHeader), mmpat);
}
static void pat_get_layerheader(MMFILE *mmpat, LayerHeader *hl)
{
InstrumentHeader ih;
mmfseek(mmpat,sizeof(PatchHeader), SEEK_SET);
mmreadUBYTES((BYTE *)&ih, sizeof(InstrumentHeader), mmpat);
mmreadUBYTES((BYTE *)hl, sizeof(LayerHeader), mmpat);
strncpy(hl->reserved, ih.instrument_name, 40);
}
static int pat_read_numsmp(MMFILE *mmpat) {
LayerHeader hl;
pat_get_layerheader(mmpat, &hl);
return hl.samples;
}
static void pat_read_waveheader(MMSTREAM *mmpat, WaveHeader *hw, int layer)
{
long int pos, bestpos=0;
LayerHeader hl;
ULONG bestfreq, freqdist;
int i;
// read the very first and maybe only sample
pat_read_layerheader(mmpat, &hl);
if( hl.samples > 1 ) {
if( layer ) {
if( layer > hl.samples ) layer = hl.samples; // you don't fool me....
for( i=1; i<layer; i++ ) {
_mm_read_UBYTES((BYTE *)hw, sizeof(WaveHeader), mmpat);
_mm_fseek(mmpat, hw->wave_size, SEEK_CUR);
}
}
else {
bestfreq = C4mHz * 1000; // big enough
for( i=0; i<hl.samples; i++ ) {
pos = _mm_ftell(mmpat);
_mm_read_UBYTES((BYTE *)hw, sizeof(WaveHeader), mmpat);
if( hw->root_frequency > C4mHz )
freqdist = hw->root_frequency - C4mHz;
else
freqdist = 2 * (C4mHz - hw->root_frequency);
if( freqdist < bestfreq ) {
bestfreq = freqdist;
bestpos = pos;
}
_mm_fseek(mmpat, hw->wave_size, SEEK_CUR);
}
// if invalid bestpos, assume the start.
if( bestpos < 0 )
bestpos = 0;
_mm_fseek(mmpat, bestpos, SEEK_SET);
}
}
_mm_read_UBYTES((BYTE *)hw, sizeof(WaveHeader), mmpat);
strncpy(hw->reserved, hl.reserved, 32);
hw->reserved[31] = 0;
if( hw->start_loop >= hw->wave_size ) {
hw->start_loop = 0;
hw->end_loop = 0;
hw->modes &= ~PAT_LOOP; // mask off loop indicator
}
if( hw->end_loop > hw->wave_size )
hw->end_loop = hw->wave_size;
}
static void pat_get_waveheader(MMFILE *mmpat, WaveHeader *hw, int layer)
{
long int pos, bestpos=0;
LayerHeader hl;
ULONG bestfreq, freqdist;
int i;
// read the very first and maybe only sample
pat_get_layerheader(mmpat, &hl);
if( hl.samples > 1 ) {
if( layer ) {
if( layer > hl.samples ) layer = hl.samples; // you don't fool me....
for( i=1; i<layer; i++ ) {
mmreadUBYTES((BYTE *)hw, sizeof(WaveHeader), mmpat);
mmfseek(mmpat, hw->wave_size, SEEK_CUR);
if ( mmpat->error ) {
hw->wave_size = 0;
return;
}
}
}
else {
bestfreq = C4mHz * 1000; // big enough
for( i=0; i<hl.samples; i++ ) {
pos = mmftell(mmpat);
mmreadUBYTES((BYTE *)hw, sizeof(WaveHeader), mmpat);
if( hw->root_frequency > C4mHz )
freqdist = hw->root_frequency - C4mHz;
else
freqdist = 2 * (C4mHz - hw->root_frequency);
if( freqdist < bestfreq ) {
bestfreq = freqdist;
bestpos = pos;
}
mmfseek(mmpat, hw->wave_size, SEEK_CUR);
}
mmfseek(mmpat, bestpos, SEEK_SET);
}
}
mmreadUBYTES((BYTE *)hw, sizeof(WaveHeader), mmpat);
if( hw->start_loop >= hw->wave_size ) {
hw->start_loop = 0;
hw->end_loop = 0;
hw->modes &= ~PAT_LOOP; // mask off loop indicator
}
if( hw->end_loop > hw->wave_size )
hw->end_loop = hw->wave_size;
}
static int pat_readpat_attr(int pat, WaveHeader *hw, int layer)
{
char fname[128];
unsigned long fsize;
MMSTREAM *mmpat;
pat_build_path(fname, pat);
mmpat = _mm_fopen(fname, "rb");
if( !mmpat )
return 0;
fsize = _mm_getfsize(mmpat);
pat_read_waveheader(mmpat, hw, layer);
_mm_fclose(mmpat);
if (hw->wave_size > fsize)
return 0;
return 1;
}
static void pat_amplify(char *b, int num, int amp, int m)
{
char *pb;
BYTE *pu;
short int *pi;
WORD *pw;
int i,n,v;
n = num;
if( m & PAT_16BIT ) { // 16 bit
n >>= 1;
if( m & 2 ) { // unsigned
pw = (WORD *)b;
for( i=0; i<n; i++ ) {
v = (((int)(*pw) - 0x8000) * amp) / 100;
if( v < -0x8000 ) v = -0x8000;
if( v > 0x7fff ) v = 0x7fff;
*pw++ = v + 0x8000;
}
}
else {
pi = (short int *)b;
for( i=0; i<n; i++ ) {
v = ((*pi) * amp) / 100;
if( v < -0x8000 ) v = -0x8000;
if( v > 0x7fff ) v = 0x7fff;
*pi++ = v;
}
}
}
else {
if( m & 2 ) { // unsigned
pu = (BYTE *)b;
for( i=0; i<n; i++ ) {
v = (((int)(*pu) - 0x80) * amp) / 100;
if( v < -0x80 ) v = -0x80;
if( v > 0x7f ) v = 0x7f;
*pu++ = v + 0x80;
}
}
else {
pb = (char *)b;
for( i=0; i<n; i++ ) {
v = ((*pb) * amp) / 100;
if( v < -0x80 ) v = -0x80;
if( v > 0x7f ) v = 0x7f;
*pb++ = v;
}
}
}
}
static int pat_getopt(const char *s, const char *o, int dflt)
{
const char *p;
if( !s ) return dflt;
p = strstr(s,o);
if( !p ) return dflt;
return atoi(strchr(p,'=')+1);
}
static void pat_readpat(int pat, char *dest, int num)
{
static int readlasttime = 0, wavesize = 0;
static MMSTREAM *mmpat = 0;
static char *opt = 0;
int amp;
char fname[128];
WaveHeader hw;
if( !readlasttime ) {
opt=pat_build_path(fname, pat);
mmpat = _mm_fopen(fname, "rb");
if( !mmpat )
return;
pat_read_waveheader(mmpat, &hw, 0);
wavesize = hw.wave_size;
}
_mm_read_SBYTES(dest, num, mmpat);
amp = pat_getopt(opt,"amp",100);
if( amp != 100 ) pat_amplify(dest, num, amp, hw.modes);
readlasttime += num;
if( readlasttime < wavesize ) return;
readlasttime = 0;
_mm_fclose(mmpat);
mmpat = 0;
}
static BOOL dec_pat_Decompress16Bit(short int *dest, int cbcount, int samplenum)
{
int i;
PAT_SAMPLE_FUN f;
if( samplenum < MAXSMP ) pat_readpat(samplenum, (char *)dest, cbcount*2);
else {
f = pat_fun[(samplenum - MAXSMP) % 3];
for( i=0; i<cbcount; i++ )
dest[i] = (short int)(32000.0*f(i));
}
return cbcount;
}
// convert 8 bit data to 16 bit!
// We do the conversion in reverse so that the data we're converting isn't overwritten
// by the result.
static void pat_blowup_to16bit(short int *dest, int cbcount) {
char *s;
short int *d;
int t;
s = (char *)dest;
d = dest;
s += cbcount;
d += cbcount;
for(t=0; t<cbcount; t++)
{
s--;
d--;
*d = (*s) << 8;
}
}
static BOOL dec_pat_Decompress8Bit(short int *dest, int cbcount, int samplenum)
{
int i;
PAT_SAMPLE_FUN f;
if( samplenum < MAXSMP ) pat_readpat(samplenum, (char *)dest, cbcount);
else {
f = pat_fun[(samplenum - MAXSMP) % 3];
for( i=0; i<cbcount; i++ )
dest[i] = (char)(120.0*f(i));
}
pat_blowup_to16bit(dest, cbcount);
return cbcount;
}
// =====================================================================================
BOOL CSoundFile::TestPAT(const BYTE *lpStream, DWORD dwMemLength)
// =====================================================================================
{
PatchHeader ph;
if( dwMemLength < sizeof(PatchHeader) ) return 0;
memcpy((BYTE *)&ph, lpStream, sizeof(PatchHeader));
if( !strcmp(ph.header,"GF1PATCH110") && !strcmp(ph.gravis_id,"ID#000002") ) return 1;
return 0;
}
// =====================================================================================
static PATHANDLE *PAT_Init(void)
{
PATHANDLE *retval;
retval = (PATHANDLE *)calloc(1,sizeof(PATHANDLE));
if( !retval ) return NULL;
return retval;
}
// =====================================================================================
static void PAT_Cleanup(PATHANDLE *handle)
// =====================================================================================
{
if(handle) {
free(handle);
}
}
static char tune[] = "c d e c|c d e c|e f g..|e f g..|gagfe c|gagfe c|c G c..|c G c..|";
static int pat_note(int abc)
{
switch( abc ) {
case 'C': return 48;
case 'D': return 50;
case 'E': return 52;
case 'F': return 53;
case 'G': return 55;
case 'A': return 57;
case 'B': return 59;
case 'c': return 60;
case 'd': return 62;
case 'e': return 64;
case 'f': return 65;
case 'g': return 67;
case 'a': return 69;
case 'b': return 71;
default:
break;
}
return 0;
}
int pat_modnote(int midinote)
{
int n;
n = midinote;
n += 13;
return n;
}
// =====================================================================================
static void PAT_ReadPatterns(MODCOMMAND *pattern[], WORD psize[], PATHANDLE *h, int numpat)
// =====================================================================================
{
int pat,row,i,ch;
BYTE n,ins,vol;
int t;
int tt1, tt2;
MODCOMMAND *m;
if( numpat > MAX_PATTERNS ) numpat = MAX_PATTERNS;
tt2 = (h->samples - 1) * 16 + 128;
for( pat = 0; pat < numpat; pat++ ) {
pattern[pat] = CSoundFile::AllocatePattern(64, h->samples);
if( !pattern[pat] ) return;
psize[pat] = 64;
for( row = 0; row < 64; row++ ) {
tt1 = (pat * 64 + row);
for( ch = 0; ch < h->samples; ch++ ) {
t = tt1 - ch * 16;
m = &pattern[pat][row * h->samples + ch];
m->param = 0;
m->command = CMD_NONE;
if( t >= 0 ) {
i = tt2 - 16 * ((h->samples - 1 - ch) & 3);
if( tt1 < i ) {
t = t % 64;
if( isalpha(tune[t]) ) {
n = pat_modnote(pat_note(tune[t]));
ins = ch + 1;
vol = 40;
if( (t % 16) == 0 ) {
vol += vol / 10;
if( vol > 64 ) vol = 64;
}
m->instr = ins;
m->note = n; // <- normal note
m->volcmd = VOLCMD_VOLUME;
m->vol = vol;
}
if( tt1 == i - 1 && ch == 0 && row < 63 ) {
m->command = CMD_PATTERNBREAK;
}
}
else {
if( tt1 == i ) {
m->param = 0;
m->command = CMD_KEYOFF;
m->volcmd = VOLCMD_VOLUME;
m->vol = 0;
}
}
}
}
}
}
}
// calculate the best speed that approximates the pat root frequency as a C note
static ULONG pat_patrate_to_C4SPD(ULONG patRate , ULONG patMilliHz)
{
ULONG u;
double x, y;
u = patMilliHz;
x = 0.1 * patRate;
x = x * C4mHz;
y = u * 0.4;
x = x / y;
u = (ULONG)(x+0.5);
return u;
}
// return relative position in samples for the rate starting with offset start ending with offset end
static int pat_envelope_rpos(int rate, int start, int end)
{
int r, p, t, s;
// rate byte is 3 bits exponent and 6 bits increment size
// eeiiiiii
// every 8 to the power ee the volume is incremented/decremented by iiiiii
// Thank you Gravis for this weirdness...
r = 3 - ((rate >> 6) & 3) * 3;
p = rate & 0x3f;
if( !p ) return 0;
t = end - start;
if( !t ) return 0;
if (t < 0) t = -t;
s = (t << r)/ p;
return s;
}
static void pat_modenv(WaveHeader *hw, int mpos[6], int mvol[6])
{
int i, sum, s;
BYTE *prate = hw->envelope_rate, *poffset = hw->envelope_offset;
for( i=0; i<6; i++ ) {
mpos[i] = 0;
mvol[i] = 64;
}
if( !memcmp(prate, "??????", 6) || poffset[5] >= 100 ) return; // weird rates or high env end volume
if( !(hw->modes & PAT_SUSTAIN) ) return; // no sustain thus no need for envelope
s = hw->wave_size;
if (s == 0) return;
if( hw->modes & PAT_16BIT )
s >>= 1;
// offsets 0 1 2 3 4 5 are distributed over 0 2 4 6 8 10, the odd numbers are set in between
sum = 0;
for( i=0; i<6; i++ ) {
mvol[i] = poffset[i];
mpos[i] = pat_envelope_rpos(prate[i], i? poffset[i-1]: 0, poffset[i]);
sum += mpos[i];
}
if( sum == 0 ) return;
if( sum > s ) {
for( i=0; i<6; i++ )
mpos[i] = (s * mpos[i]) / sum;
}
for( i=1; i<6; i++ )
mpos[i] += mpos[i-1];
for( i=0; i<6 ; i++ ) {
mpos[i] = (256 * mpos[i]) / s;
mpos[i]++;
if( i > 0 && mpos[i] <= mpos[i-1] ) {
if( mvol[i] == mvol[i-1] ) mpos[i] = mpos[i-1];
else mpos[i] = mpos[i-1] + 1;
}
if( mpos[i] > 256 ) mpos[i] = 256;
}
mvol[5] = 0; // kill Bill....
}
static void pat_setpat_inst(WaveHeader *hw, INSTRUMENTHEADER *d, int smp)
{
int u, inuse;
int envpoint[6], envvolume[6];
d->nMidiProgram = 0;
d->nFadeOut = 0;
d->nPan = 128;
d->nPPC = 5*12;
d->dwFlags = 0;
if( hw->modes & PAT_ENVELOPE ) d->dwFlags |= ENV_VOLUME;
if( hw->modes & PAT_SUSTAIN ) d->dwFlags |= ENV_VOLSUSTAIN;
if( (hw->modes & PAT_LOOP) && (hw->start_loop != hw->end_loop) ) d->dwFlags |= ENV_VOLLOOP;
d->nVolEnv = 6;
//if (!d->nVolEnv) d->dwFlags &= ~ENV_VOLUME;
d->nPanEnv = 0;
d->nVolSustainBegin = 1;
d->nVolSustainEnd = 1;
d->nVolLoopStart = 1;
d->nVolLoopEnd = 2;
d->nPanSustainBegin = 0;
d->nPanSustainEnd = 0;
d->nPanLoopStart = 0;
d->nPanLoopEnd = 0;
d->nGlobalVol = 64;
pat_modenv(hw, envpoint, envvolume);
inuse = 0;
for( u=0; u<6; u++)
{
if( envvolume[u] != 64 ) inuse = 1;
d->VolPoints[u] = envpoint[u];
d->VolEnv[u] = envvolume[u];
d->PanPoints[u] = 0;
d->PanEnv[u] = 0;
if (u)
{
if (d->VolPoints[u] < d->VolPoints[u-1])
{
d->VolPoints[u] &= 0xFF;
d->VolPoints[u] += d->VolPoints[u-1] & 0xFF00;
if (d->VolPoints[u] < d->VolPoints[u-1]) d->VolPoints[u] += 0x100;
}
}
}
if( !inuse ) d->nVolEnv = 0;
for( u=0; u<128; u++)
{
d->NoteMap[u] = u+1;
d->Keyboard[u] = smp;
}