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pt3_lib.c
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/* pt3_lib: decode a pt3 file to a stream of AY-3-8910 frames */
/* by Vince Weaver <[email protected]> */
/* Version 1.0 -- 17 October 2019 */
/* Some code based on Formats.pas in Bulba's ay_emul */
/* Version with full tables: 10304 bytes (gcc 9.2.1, x86) */
/* 9544 bytes (no printfs) */
/* 9304 bytes (z80 table) */
/* 9104 bytes (opt z80) */
/* 7464 bytes (gen freq tables) */
#include <stdint.h>
#ifdef PT3LIB_EMBEDDED
#include "string.h"
#include "stdlib.h"
#else
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <arpa/inet.h>
#endif
#include "pt3_lib.h"
static unsigned char PT3VolumeTable[16][16];
static void pt3_message(char *message) {
#ifdef PT3LIB_EMBEDDED
#else
fprintf(stderr,"%s",message);
#endif
}
static void pt3_load_ornament(struct pt3_song_t *pt3, int which) {
struct pt3_note_type *a;
if (which=='A') a=&(pt3->a);
else if (which=='B') a=&(pt3->b);
else if (which=='C') a=&(pt3->c);
else return;
a->ornament_pointer=pt3->ornament_patterns[a->ornament];
a->ornament_loop=pt3->data[a->ornament_pointer];
a->ornament_pointer++;
a->ornament_length=pt3->data[a->ornament_pointer];
a->ornament_pointer++;
}
static void pt3_load_sample(struct pt3_song_t *pt3, int which) {
struct pt3_note_type *a;
if (which=='A') a=&(pt3->a);
else if (which=='B') a=&(pt3->b);
else if (which=='C') a=&(pt3->c);
else return;
a->sample_pointer=pt3->sample_patterns[a->sample];
a->sample_loop=pt3->data[a->sample_pointer];
a->sample_pointer++;
a->sample_length=pt3->data[a->sample_pointer];
a->sample_pointer++;
}
static int pt3_load_header(int verbose, struct pt3_song_t *pt3) {
int i;
pt3->music_len=0;
/* Magic: 13 bytes at offset 0 */
memcpy(&(pt3->magic),&(pt3->data[0]),13);
if (!memcmp(pt3->magic,"ProTracker 3.",13)) {
//pt3_message("Found ProTracker 3.");
}
else if (!memcmp(pt3->magic,"Vortex Tracke",13)) {
//pt3_message("Found Vortex Tracke");
} else {
pt3_message(pt3->magic);
pt3_message("Wrong magic != ProTracker 3.\n");
/* sometimes it is still a valid file... */
//return -1;
}
/* version -- byte at offset 0xd */
//pt3->version=pt3->data[0xd];
pt3->version=6;
if ((pt3->data[0xd]>='0') && (pt3->data[0xd]<='9')) {
pt3->version=pt3->data[0xd]-'0';
}
/* Name -- 32 bytes at offset 0x1e */
memcpy(&(pt3->name),&(pt3->data[0x1e]),32);
/* Author -- 32 bytes at offset 0x42 */
memcpy(&(pt3->author),&(pt3->data[0x42]),32);
/* Frequency Table */
pt3->which_frequency_table=pt3->data[0x63];
/* Speed */
pt3->speed=pt3->data[0x64];
/* Number of Patterns */
pt3->num_patterns=pt3->data[0x65]+1;
/* Loop Pointer */
pt3->loop=pt3->data[0x66];
/* Pattern Position */
pt3->pattern_loc=(pt3->data[0x68]<<8)|pt3->data[0x67];
/* Sample positions */
for(i=0;i<32;i++) {
pt3->sample_patterns[i]=
(pt3->data[0x6a+(i*2)]<<8)|pt3->data[0x69+(i*2)];
}
/* Ornament Positions */
for(i=0;i<16;i++) {
pt3->ornament_patterns[i]=
(pt3->data[0xaa+(i*2)]<<8)|pt3->data[0xa9+(i*2)];
}
/* Pattern Order */
pt3->pattern_order=(pt3->data[0xca]<<8)|pt3->data[0xc9];
/* Calculate number of patterns in song */
/* This isn't really necessary */
i=0;
while(1) {
if (pt3->data[0xc9+i]==0xff) break;
i++;
pt3->music_len++;
}
return 0;
}
static void calculate_note(struct pt3_note_type *a, struct pt3_song_t *pt3) {
// B0: XX YYYYY Z = X= 10=VOLDOWN 11=VOLUP
// Y=NOISE, Z= 0=ENV, 1=NO ENVELOPE
// B1: X Y Z AAAA = X= ENVELOPE or NOISE add
// Z= also make sliding
// if Envelope slide:
// B0: Y YYYY = add/sub and slide value
// if Noise slide:
// B0: YYYY = noise add
// XXXXXXXX = LOW BYTE FREQ SLIDE
// YYYYYYYY = HIGH BYTE FREQ SLIDE
//
// 80 8f 00 00
// 1000 0000 -- VOLDOWN
// 10 00 1111 --FREQ_SLIDE, VOLUME
int j,b1,b0; // byte;
int w; // word;
if (a->enabled) {
/* Get first two bytes of 4-byte sample step */
b0 = pt3->data[a->sample_pointer +
(short)(a->sample_position)* 4];
b1 = pt3->data[a->sample_pointer +
(short)(a->sample_position)* 4 + 1];
/* The next two bytes are the freq slide value? */
a->tone = pt3->data[a->sample_pointer +
(a->sample_position)*4 + 2];
a->tone += (pt3->data[a->sample_pointer +
(a->sample_position)*4+3])<<8;
a->tone += a->tone_accumulator;
/* Accumulate tone if set */
if ((b1 & 0x40) != 0) {
a->tone_accumulator=a->tone;
}
/* Get the Note and add in the ornament value */
/* It's a single byte, sign-extend it */
j = a->note + ((pt3->data[a->ornament_pointer +
a->ornament_position]<<24)>>24);
/* Make sure the note stays in bounds */
if (j < 0) j = 0;
else if (j > 95) j = 95;
/* Look up the note in the frequency table */
/* Which technically is a period table */
w = pt3->frequency_table[j]; //GetNoteFreq(j,pt3);
/* Take the sample tone, and combine with sliding */
/* and ornament */
a->tone = (a->tone + a->tone_sliding + w) & 0xfff;
/* If we are sliding, handle the sliding part */
if (a->tone_slide_count > 0) {
a->tone_slide_count--;
if (a->tone_slide_count==0) {
a->tone_sliding+=a->tone_slide_step;
a->tone_slide_count = a->tone_slide_delay;
if (!a->simplegliss) {
if ( ((a->tone_slide_step < 0) &&
(a->tone_sliding <= a->tone_delta)) ||
((a->tone_slide_step >= 0) &&
(a->tone_sliding >= a->tone_delta)) ) {
a->note = a->slide_to_note;
a->tone_slide_count = 0;
a->tone_sliding = 0;
}
}
}
}
/* Calculate the amplitude */
/* First get the value from the sample */
a->amplitude= (b1 & 0xf);
/* Top bit indicates sliding */
if ((b0 & 0x80)!=0) {
/* Next bit high (0b11) means slide up */
if ((b0&0x40)!=0) {
if (a->amplitude_sliding < 15) {
a->amplitude_sliding++;
}
}
/* Next bit low (0b10) means slide down */
else {
if (a->amplitude_sliding > -15) {
a->amplitude_sliding--;
}
}
}
a->amplitude+=a->amplitude_sliding;
/* Make sure the amplitude stays in bounds */
if (a->amplitude < 0) a->amplitude = 0;
else if (a->amplitude > 15) a->amplitude = 15;
a->amplitude = PT3VolumeTable[a->volume]
[(unsigned char)a->amplitude];
/* Bottom bit of b0 indicates our sample has envelope */
/* Also make sure envelopes are enabled */
/* Bit 4 of the AY-3-8910 amplitude specifies */
/* envelope enabled */
if (((b0 & 0x1) == 0) && ( a->envelope_enabled)) {
a->amplitude |= 16;
}
/* Envelope slide */
/* If b1 top bits are 10 or 11 */
if ((b1 & 0x80) != 0) {
/* Slide down? Sign extend? */
if ((b0 & 0x20) != 0) {
j = ((b0>>1)|0xF0);
j= (j<<24)>>24;
j+= a->envelope_sliding;
}
/* Slide up by bottom 4 bits? */
else {
j = ((b0>>1)&0xF) + a->envelope_sliding;
}
if (( b1 & 0x20) != 0) {
a->envelope_sliding = j;
}
pt3->envelope_add+=j;
}
/* Noise slide */
else {
pt3->noise_add = (b0>>1) + a->noise_sliding;
if ((b1 & 0x20) != 0) {
a->noise_sliding = pt3->noise_add;
}
}
pt3->mixer_value = ((b1 >>1) & 0x48) | pt3->mixer_value;
a->sample_position++;
if (a->sample_position >= a->sample_length) {
a->sample_position = a->sample_loop;
}
a->ornament_position++;
if (a->ornament_position >= a->ornament_length) {
a->ornament_position = a->ornament_loop;
}
} else {
a->amplitude=0;
}
pt3->mixer_value=pt3->mixer_value>>1;
if (a->onoff>0) {
a->onoff--;
if (a->onoff==0) {
a->enabled=!a->enabled;
if (a->enabled) a->onoff=a->onoff_delay;
else a->onoff=a->offon_delay;
}
}
}
static void decode_note(struct pt3_note_type *a,
struct pt3_song_t *pt3) {
int a_done=0;
int current_val;
unsigned char prev_note;
signed short prev_sliding;
int new_spec=0;
a->new_note=0;
a->spec_command=0;
a->spec_delay=0;
a->spec_lo=0;
/* Skip decode if note still running */
if (a->len_count>1) {
a->len_count--;
return;
}
prev_note=a->note;
prev_sliding=a->tone_sliding;
while(1) {
a->len_count=a->len;
current_val=pt3->data[a->addr];
switch((current_val>>4)&0xf) {
case 0:
if (current_val==0x0) {
//printf("ALL DONE %c\n",a->which);
a->len_count=0;
a->all_done=1;
a_done=1;
}
else {
a->spec_command=current_val&0xf;
}
break;
case 1:
if ((current_val&0xf)==0x0) {
a->envelope_enabled=0;
}
else {
pt3->envelope_type_old=0x78;
pt3->envelope_type=(current_val&0xf);
a->addr++;
current_val=pt3->data[a->addr];
pt3->envelope_period=(current_val<<8);
a->addr++;
current_val=pt3->data[a->addr];
pt3->envelope_period|=
(current_val&0xff);
a->envelope_enabled=1;
pt3->envelope_slide=0;
pt3->envelope_delay=0;
}
a->addr++;
current_val=pt3->data[a->addr];
a->sample=(current_val/2);
pt3_load_sample(pt3,a->which);
// printf("0x1: Sample pointer %d %x\n",
// a->sample,a->sample_pointer);
a->ornament_position=0;
break;
case 2:
pt3->noise_period=(current_val&0xf);
break;
case 3:
pt3->noise_period=(current_val&0xf)+0x10;
break;
case 4:
a->ornament=(current_val&0xf);
pt3_load_ornament(pt3,a->which);
a->ornament_position=0;
break;
case 5:
case 6:
case 7:
case 8:
case 9:
case 0xa:
a->new_note=1;
a->note=(current_val-0x50);
a->original_note=(current_val-0x50);
a->sample_position=0;
a->amplitude_sliding=0;
a->noise_sliding=0;
a->envelope_sliding=0;
a->ornament_position=0;
a->tone_slide_count=0;
a->tone_sliding=0;
a->tone_accumulator=0;
a->onoff=0;
a->enabled=1;
a_done=1;
break;
case 0xb:
/* Disable envelope */
if (current_val==0xb0) {
a->envelope_enabled=0;
a->ornament_position=0;
}
/* set len */
else if (current_val==0xb1) {
a->addr++;
current_val=pt3->data[a->addr];
a->len=current_val;
a->len_count=a->len;
}
else {
a->envelope_enabled=1;
pt3->envelope_type_old=0x78;
pt3->envelope_type=(current_val&0xf)-1;
a->addr++;
current_val=pt3->data[a->addr];
pt3->envelope_period=(current_val<<8);
a->addr++;
current_val=pt3->data[a->addr];
pt3->envelope_period|=
(current_val&0xff);
a->ornament_position=0;
pt3->envelope_slide=0;
pt3->envelope_delay=0;
}
break;
case 0xc: /* volume */
if ((current_val&0xf)==0) {
//a->note=0xff;
a->sample_position=0;
a->amplitude_sliding=0;
// one song needed this to match?
//pt3->noise_period=0;
a->noise_sliding=0;
a->envelope_sliding=0;
a->ornament_position=0;
a->tone_slide_count=0;
a->tone_sliding=0;
a->tone_accumulator=0;
a->onoff=0;
a->enabled=0;
a_done=1;
}
else {
a->volume=current_val&0xf;
}
break;
case 0xd:
if (current_val==0xd0) {
a_done=1;
}
else {
a->sample=(current_val&0xf);
pt3_load_sample(pt3,a->which);
// printf("0xd: sample %d sample "
// "pointer %x\n",
// a->sample,a->sample_pointer);
}
break;
case 0xe:
a->sample=(current_val-0xd0);
pt3_load_sample(pt3,a->which);
break;
case 0xf:
a->envelope_enabled=0;
a->ornament_position=0;
a->ornament=(current_val&0xf);
pt3_load_ornament(pt3,a->which);
a->addr++;
current_val=pt3->data[a->addr];
a->sample=current_val/2;
pt3_load_sample(pt3,a->which);
break;
}
a->addr++;
/* Note, the AY code has code to make sure these are applied */
/* In the same order they appear. We don't bother? */
if (a_done) {
if (a->spec_command==0x0) {
}
/* Tone Down */
else if (a->spec_command==0x1) {
current_val=pt3->data[a->addr];
a->spec_delay=current_val;
a->tone_slide_delay=current_val;
a->tone_slide_count=a->tone_slide_delay;
a->addr++;
current_val=pt3->data[a->addr];
a->spec_lo=(current_val);
a->addr++;
current_val=pt3->data[a->addr];
a->spec_hi=(current_val);
a->tone_slide_step=(a->spec_lo)|(a->spec_hi<<8);
/* Sign Extend */
//a->tone_slide_step=
// (a->tone_slide_step<<16)>>16;
a->simplegliss=1;
a->onoff=0;
a->addr++;
/* in the tracker it's 1 */
if (a->tone_slide_step>=0) new_spec=0x1;
else {
signed short new_parm;
new_spec=0x2;
new_parm=a->tone_slide_step;
new_parm=-new_parm;
a->spec_hi=new_parm>>8;
a->spec_lo=new_parm&0xff;
}
}
/* port */
else if (a->spec_command==0x2) {
a->simplegliss=0;
a->onoff=0;
current_val=pt3->data[a->addr];
a->spec_delay=current_val;
a->tone_slide_delay=current_val;
a->tone_slide_count=a->tone_slide_delay;
a->addr++;
a->addr++;
a->addr++;
current_val=pt3->data[a->addr];
a->spec_lo=current_val;
a->addr++;
current_val=pt3->data[a->addr];
a->spec_hi=current_val;
a->addr++;
a->tone_slide_step=(a->spec_hi<<8)|(a->spec_lo);
/* sign extend */
//a->tone_slide_step=
// (a->tone_slide_step<<16)>>16;
/* abs() */
if (a->tone_slide_step<0) {
a->tone_slide_step=-a->tone_slide_step;
}
a->tone_delta=pt3->frequency_table[a->note]-
pt3->frequency_table[prev_note];
a->slide_to_note=a->note;
a->note=prev_note;
if (pt3->version >= 6) {
a->tone_sliding = prev_sliding;
}
if ((a->tone_delta - a->tone_sliding) < 0) {
a->tone_slide_step=-a->tone_slide_step;
}
/* In the tracker it's 3 */
new_spec=0x3;
}
/* Position in Sample */
else if (a->spec_command==0x3) {
/* Note, unclear what to do here if */
/* offset is out of bounds */
current_val=pt3->data[a->addr];
a->sample_position=current_val;
a->addr++;
new_spec=0x4;
}
/* Position in Ornament */
else if (a->spec_command==0x4) {
current_val=pt3->data[a->addr];
a->ornament_position=current_val;
a->addr++;
new_spec=0x5;
}
/* Vibrato */
else if (a->spec_command==0x5) {
current_val=pt3->data[a->addr];
a->onoff_delay=current_val;
a->addr++;
current_val=pt3->data[a->addr];
a->offon_delay=current_val;
a->addr++;
a->onoff=a->onoff_delay;
a->tone_slide_count=0;
a->tone_sliding=0;
new_spec=0x6;
}
/* Envelope Down */
else if (a->spec_command==0x8) {
/* delay? */
current_val=pt3->data[a->addr];
pt3->envelope_delay=current_val;
pt3->envelope_delay_orig=current_val;
a->spec_delay=current_val;
a->addr++;
/* Low? */
current_val=pt3->data[a->addr];
a->spec_lo=current_val&0xff;
a->addr++;
/* High? */
current_val=pt3->data[a->addr];
a->spec_hi=current_val&0xff;
a->addr++;
pt3->envelope_slide_add=
(a->spec_hi<<8)|(a->spec_lo&0xff);
/* in the tracker it's 9 */
if (pt3->envelope_slide_add<0x8000) {
new_spec=0x9;
}
else {
signed short new_parm;
new_spec=0xa;
new_parm=pt3->envelope_slide_add;
new_parm=-new_parm;
a->spec_hi=new_parm>>8;
a->spec_lo=new_parm&0xff;
}
}
/* Set Speed */
else if (a->spec_command==0x9) {
current_val=pt3->data[a->addr];
a->spec_lo=current_val;
pt3->speed=current_val;
a->addr++;
/* in tracker it's B */
new_spec=0xb;
}
else {
pt3_message("UNKNOWN EFFECT\n");
// printf("%c UNKNOWN effect %02X\n",
// a->which,a->spec_command);
}
a->spec_command=new_spec;
break;
}
}
}
/* PT3VolumeTable_35 = 1 */
/* PT3VolumeTable_33334 = 0 */
static void pt3_setup_volume_table(int which) {
//based on VolTableCreator by Ivan Roshin
// originally in z80 assembly language
//A - VersionForVolumeTable (0..4 - 3.xx..3.4x;
//5.. - 3.5x..3.6x..VTII1.0)
unsigned int carry,a,hl,de,temp1,temp2,c,ix;
/* 0x00 or 0x10 */
de=(which<<4);
for(ix=1;ix<16;ix++) {
/* 0x10 or 0x11 */
hl=(0x11-which);
hl=hl+de;
carry=(hl>>16);
hl&=0xffff;
/* swap hl and de */
temp1=hl;
temp2=de;
hl=temp2;
de=temp1;
/* 0 or 0xffff */
hl=(0-carry)&0xffff;
for(c=0;c<16;c++) {
if (!which) {
carry=!!(hl&0x80);
}
a=(hl>>8)&0xff;
a=a+carry;
PT3VolumeTable[ix][c]=a;
hl=hl+de;
}
if ((de&0xff)==0x77) {
de++;
}
}
}
static unsigned short base0_v3[]={
0xC21,0xB73,0xACE,0xA33,0x9A0,0x916,0x893,0x818,0x7A4,0x736,0x6CE,0x66D,
};
static unsigned short base0_v4[]={
0xC22,0xB73,0xACF,0xA33,0x9A1,0x917,0x894,0x819,0x7A4,0x737,0x6CF,0x66D,
};
static unsigned short base1[]={
0xEF8,0xE10,0xD60,0xC80,0xBD8,0xB28,0xA88,0x9F0,0x960,0x8E0,0x858,0x7E0,
};
static unsigned short base2_v3[]={
0xD3E,0xC80,0xBCC,0xB22,0xA82,0x9EC,0x95C,0x8D6,0x858,0x7E0,0x76E,0x704,
};
static unsigned short base2_v4[]={
0xD10,0xC55,0xBA4,0xAFC,0xA5F,0x9CA,0x93D,0x8B8,0x83B,0x7C5,0x755,0x6EC,
};
/* note: same for both versions */
static unsigned short base3[]={
0xCDA,0xC22,0xB73,0xACF,0xA33,0x9A1,0x917,0x894,0x819,0x7A4,0x737,0x6CF,
};
static unsigned char table0_v4_adjust[]={
0x40, 0xe6, 0x9c, 0x66, 0x40, 0x2c, 0x20, 0x30, 0x48, 0x6c, 0x1c, 0x5a,
};
static unsigned char table2_v3_adjust[]={
0xf8, 0x80, 0x90, 0xc0, 0x04, 0xf0, 0xf8, 0xec, 0xe0, 0xc0, 0xfc, 0x40,
};
static unsigned char table2_v4_adjust[]={
0x20, 0xa8, 0x40, 0xf8, 0xbc, 0x90, 0x78, 0x70, 0x74, 0x08, 0x2a, 0x50,
};
static unsigned char table3_v4_adjust[]={
0xB4, 0x40, 0xe6, 0x9c, 0x66, 0x40, 0x2c, 0x20, 0x30, 0x48, 0x6c, 0x1c,
};
static void NoteTablePropogate(unsigned short *base_table,
unsigned short *Tone) {
int x,y;
for(y=0;y<12;y++) Tone[y]=base_table[y];
for(x=0;x<84;x++) {
Tone[x+12]=Tone[x]>>1;
}
}
static void NoteTableAdjust(unsigned char *adjust_table,
unsigned short *Tone) {
int blah,extra;
int offset=0;
int x,y;
for(y=0;y<12;y++) {
offset=y;
blah=adjust_table[y];
for(x=0;x<8;x++) {
extra=blah&1;
blah>>=1;
Tone[offset]+=extra;
offset+=12;
}
}
return;
}
int pt3_init_song(struct pt3_song_t *pt3) {
int result;
/* copy in the header data */
result=pt3_load_header(1,pt3);
if (result) {
pt3_message("Error decoding header!\n");
return -1;
}
memset(&pt3->a,0,sizeof(struct pt3_note_type));
memset(&pt3->b,0,sizeof(struct pt3_note_type));
memset(&pt3->c,0,sizeof(struct pt3_note_type));
pt3->a.which='A';
pt3->a.volume=15;
pt3->a.tone_sliding=0;
pt3->a.amplitude_sliding=0;
pt3->a.enabled=0;
pt3->a.envelope_enabled=0;
pt3->a.ornament=0;
pt3->a.ornament_position=0;
pt3_load_ornament(pt3,'A');
pt3->a.sample_position=0;
pt3->a.sample=1;
pt3_load_sample(pt3,'A');
pt3->b.which='B';
pt3->b.volume=15;
pt3->b.tone_sliding=0;
pt3->b.amplitude_sliding=0;
pt3->b.enabled=0;
pt3->b.envelope_enabled=0;
pt3->b.ornament=0;
pt3->b.ornament_position=0;
pt3_load_ornament(pt3,'B');
pt3->b.sample_position=0;
pt3->b.sample=1;
pt3_load_sample(pt3,'B');
pt3->c.which='C';
pt3->c.volume=15;
pt3->c.tone_sliding=0;
pt3->c.amplitude_sliding=0;
pt3->c.enabled=0;
pt3->c.envelope_enabled=0;
pt3->c.ornament=0;
pt3->c.ornament_position=0;
pt3_load_ornament(pt3,'C');
pt3->c.sample_position=0;
pt3->c.sample=1;
pt3_load_sample(pt3,'C');
memset(&pt3->a_old,0,sizeof(struct pt3_note_type));
memset(&pt3->b_old,0,sizeof(struct pt3_note_type));
memset(&pt3->c_old,0,sizeof(struct pt3_note_type));
/* Some defaults */
pt3->noise_period=0;
pt3->noise_add=0;
pt3->envelope_period=0;
pt3->envelope_type=0;
pt3->envelope_type_old=0;
pt3->envelope_slide_add=0;
pt3->current_pattern=0;
/************************/
/* set up volume table */
/************************/
if (pt3->version <= 4) {
/* PT3VolumeTable_3334 */
pt3_setup_volume_table(1);
}
else {
/* PT3VolumeTable_35 */
pt3_setup_volume_table(0);
}
/**************************/
/* set up frequency table */
/**************************/
if (pt3->which_frequency_table==0) {
if (pt3->version <= 3) {
/* create table #0 v3.3 "PT3NoteTable_PT_33_34r" */
NoteTablePropogate(base0_v3,pt3->frequency_table);
}
else {
/* create table #0 v3.4 "PT3NoteTable_PT_34_35" */
NoteTablePropogate(base0_v4,pt3->frequency_table);
NoteTableAdjust(table0_v4_adjust,pt3->frequency_table);
}
}
else if (pt3->which_frequency_table==1) {
/* create table #1 "PT3NoteTable_ST" */
NoteTablePropogate(base1,pt3->frequency_table);
pt3->frequency_table[23]+=13;
pt3->frequency_table[46]-=1;
}
else if (pt3->which_frequency_table==2) {
if (pt3->version <= 3) {
/* Create Table #2, v3, "PT3NoteTable_ASM_34r" */
NoteTablePropogate(base2_v3,pt3->frequency_table);
NoteTableAdjust(table2_v3_adjust,pt3->frequency_table);
pt3->frequency_table[86]+=1;
pt3->frequency_table[87]+=1;
}
else {
/* Create Table #2, v4+, "PT3NoteTable_ASM_34_35" */
NoteTablePropogate(base2_v4,pt3->frequency_table);
NoteTableAdjust(table2_v4_adjust,pt3->frequency_table);
}
}
else {
if (pt3->version <= 3) {
/* Create Table #3, v3, "PT3NoteTable_REAL_34r" */
NoteTablePropogate(base3,pt3->frequency_table);
NoteTableAdjust(table3_v4_adjust,pt3->frequency_table);
pt3->frequency_table[43]++;
}
else {
/* Create Table #3, v4+, "PT3NoteTable_REAL_34_35" */
NoteTablePropogate(base3,pt3->frequency_table);
NoteTableAdjust(table3_v4_adjust,pt3->frequency_table);
}
}
return 0;
}
void pt3_make_frame(struct pt3_song_t *pt3, unsigned char *frame) {
/* R0/R1 = A period low/high */
/* R2/R3 = B period low/high */
/* R4/R5 = C period low/high */
/* R6 = Noise period */
/* R7 Mixer Enable: XX Noise=!CBA Tone=!CBA */
/* R8/R9/R10 = Channel A/B/C amplitude E3210 */
/* R11/R12 = Envelope Period low/high */
/* R13 = Envelope Shape (tracker: 0xff means no change) */
/* R14/R15 = I/O (ignored) */
int temp_envelope;
/* clear out frame */
memset(frame,0,16);
pt3->mixer_value=0;
pt3->envelope_add=0;
calculate_note(&pt3->a,pt3);
calculate_note(&pt3->b,pt3);
calculate_note(&pt3->c,pt3);
/* Set Period for the 3 channels */
frame[0]=pt3->a.tone&0xff;
frame[1]=(pt3->a.tone>>8)&0xff;
frame[2]=pt3->b.tone&0xff;
frame[3]=(pt3->b.tone>>8)&0xff;
frame[4]=pt3->c.tone&0xff;
frame[5]=(pt3->c.tone>>8)&0xff;
/* Noise */
frame[6]= (pt3->noise_period+pt3->noise_add)&0x1f;