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mdx_decompiler.c
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mdx_decompiler.c
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#include <string.h>
#include <stdio.h>
#include "mdx_decompiler.h"
#include "sjis.h"
static char track_name(int c) {
return c < 8 ? 'A' + c : (c < 16 ? 'P' + c - 8 : '?');
}
static int ticks_to_division(int t, int *dot) {
if(dot) *dot = 0;
switch(t) {
case 192: return 1;
case 144: if(dot) *dot = 1; return 2;
case 96: return 2;
case 72: if(dot) *dot = 1; return 4;
case 64: return 3;
case 48: return 4;
case 36: if(dot) *dot = 1; return 8;
case 32: return 6;
case 24: return 8;
case 18: if(dot) *dot = 1; return 16;
case 16: return 12;
case 12: return 16;
case 9: if(dot) *dot = 1; return 32;
case 6: return 32;
case 4: return 48;
case 3: return 64;
case 2: return 96;
case 1: return 192;
}
return 0;
}
static int note_octave(int n) {
return (n + 3) / 12;
}
#define PRINTLINE(s) d->line(s); s[0] = 0; d->cur_col = 0;
#define PRINTMMLLINE(s) memmove(s + 2, s, d->columns + 1); s[0] = track_name(i); s[1] = ' '; PRINTLINE(s);
#define LINEF(fmt...) { snprintf(d->buf, d->columns, fmt); PRINTLINE(d->buf) }
#define MMLF(fmt...) { \
char buf[40]; \
snprintf(buf, sizeof(buf), fmt); \
int l = strlen(buf); \
if(l + d->cur_col >= d->columns + 1) { \
PRINTMMLLINE(d->buf) \
} \
strncat(d->buf, buf, d->columns - d->cur_col); \
d->cur_col += l; \
}
void mdx_decompiler_init(struct mdx_decompiler *d, char *buf, int columns) {
memset(d, 0, sizeof(*d));
d->buf = buf;
d->columns = columns;
d->cur_col = 0;
d->rest_ticks = 0;
d->next_key_off = 0;
d->octave = -1;
}
void mdx_decompiler_decompile(struct mdx_decompiler *d, struct mdx_file *f) {
uint8_t utfbuf[256];
char titlebuf[280];
int l;
if(f->title_len > 0) {
memset(utfbuf, 0, sizeof(utfbuf));
l = sjis_to_utf8(f->title, f->title_len, utfbuf, sizeof(utfbuf));
if(l > 0) {
snprintf(titlebuf, sizeof(titlebuf), "#title \"%s\"", utfbuf);
d->line(titlebuf);
}
}
if(f->pdx_filename_len > 0) {
memset(utfbuf, 0, sizeof(utfbuf));
l = sjis_to_utf8(f->pdx_filename, f->pdx_filename_len, utfbuf, sizeof(utfbuf));
if(l > 0) {
snprintf(titlebuf, sizeof(titlebuf), "#pcmfile \"%s\"", utfbuf);
d->line(titlebuf);
}
}
int ops[4] = { 0, 2, 1, 3 };
for(int i = 0; i < 256; i++) {
if(f->voices[i]) {
uint8_t *v = f->voices[i];
uint8_t *op = v + 3;
LINEF("@%d = {", i);
LINEF("/* AR D1R D2R RR D1L TL KS MUL DT1 DT2 AME */");
for(int j = 0; j < 4; j++) {
int o = ops[j];
LINEF(
" %2d, %2d, %2d, %2d, %2d, %3d, %d, %2d, %2d, %2d, %d,",
op[0x08 + o] & 0x1f, // AR 0-31
op[0x0c + o] & 0x1f, // D1R 0-31
op[0x10 + o] & 0x1f, // D2R 0-31
op[0x14 + o] & 0x0f, // RR 0-15
op[0x14 + o] >> 4, // D1L 0-15
op[0x04 + o] & 0x7f, // TL 0-127
op[0x08 + o] >> 6, // KS 0-3
op[0x00 + o] & 0x0f, // MUL 0-15
op[0x00 + o] >> 4 & 0x07, // DT1 0-7
op[0x10 + o] >> 6, // DT2 0-3
op[0x0c + o] >> 7 // AME 0-1
);
}
LINEF("/* CON FL MASK */");
LINEF(" %d, %d, %2d", v[1] & 0x07, v[1] >> 3 & 0x07, v[2] & 0x0f);
LINEF("}");
}
}
const char *note_names[12] = { "d+", "e", "f", "f+", "g", "g+", "a", "a+", "b", "c", "c+", "d" };
for(int i = 0; i < f->num_tracks; i++) {
d->octave = -1;
d->rest_ticks = 0;
d->next_key_off = 0;
LINEF("/* Track %c */", track_name(i));
struct mdx_track *chan = &f->tracks[i];
int pos = 0;
// run through the entire track once to find the loop point
int loop_point = -1;
while(1) {
int r = mdx_cmd_len(chan->data, pos, chan->data_len);
if(r <= 0) {
// invalid command
break;
}
// at this point we don't need to verify command length anymore
uint8_t *b = chan->data + pos;
if(b[0] == 0xf1) {
if(b[1] != 0x00) {
loop_point = b[1] << 8 | b[2];
if(loop_point > 32768) loop_point -= 65533;
loop_point += pos;
}
break;
}
pos += r;
}
// run through again and output MML
pos = 0;
while(1) {
int r = mdx_cmd_len(chan->data, pos, chan->data_len);
if(r <= 0) {
// invalid command
break;
}
// at this point we don't need to verify command length anymore
uint8_t *b = chan->data + pos;
if(b[0] == 0xf1) {
// performance end
break;
}
if(pos == loop_point) {
MMLF(" L ")
d->octave = -1;
}
if(*b < 0x80) {
d->rest_ticks += *b + 1;
if(d->rest_ticks < 0x7f) {
int dot = 0;
int t = ticks_to_division(d->rest_ticks, &dot);
if(t)
MMLF("r%d%s", t, dot ? "." : "")
else
MMLF("r%%%d", d->rest_ticks)
d->rest_ticks = 0;
}
} else {
if(d->rest_ticks > 0) {
int dot = 0;
int t = ticks_to_division(d->rest_ticks, &dot);
if(t)
MMLF("r%d%s", t, dot ? "." : "")
else
MMLF("r%%%d", d->rest_ticks)
d->rest_ticks = 0;
}
if(*b < 0xe0) {
int ticks = b[1] + 1;
int dot = 0;
int t = d->ticks_only ? 0 : ticks_to_division(ticks, &dot);
int n = b[0] - 0x80;
int o = note_octave(n);
if((i >= 8 && !d->adpcm_notes) || (i < 8 && d->fm_note_nums)) {
if(t)
MMLF("n%d,%d%s", n, t, dot ? "." : "")
else
MMLF("n%d,%%%d", n, b[1] + 1)
} else {
if(o != d->octave) {
if(d->octave == -1)
MMLF("o%d", o)
else if(o < d->octave)
for(int j = o; j < d->octave; j++)
MMLF("<")
else if(o > d->octave)
for(int j = o; j > d->octave; j--)
MMLF(">")
// if(o - d->octave == 1 && d->octave != -1)
// MMLF(">")
// else if(d->octave - o == 1 && d->octave != -1)
// MMLF("<")
// else
// MMLF("o%d", o)
d->octave = o;
}
if(t)
MMLF("%s%d%s%s", note_names[n % 12], t, dot ? "." : "", d->next_key_off ? "&" : "")
else
MMLF("%s%%%d%s", note_names[n % 12], b[1] + 1, d->next_key_off ? "&" : "")
}
d->next_key_off = 0;
if(d->portamento && i < 8) {
int next_note = n + d->portamento * (ticks+1) / 16384;
MMLF("_");
o = note_octave(next_note);
if(o != d->octave) {
if(o - d->octave == 1)
MMLF(">")
else if(d->octave - o == 1)
MMLF("<")
else
MMLF("o%d", o)
d->octave = o;
}
if(d->fm_note_nums)
MMLF("n%d", next_note)
else
MMLF("%s", note_names[next_note%12])
d->portamento = 0;
}
} else switch(*b) {
case 0xff:
MMLF("@t%d", b[1])
break;
case 0xfe:
MMLF("y%d,%d", b[1], b[2])
break;
case 0xfd:
MMLF("@%d", b[1])
break;
case 0xfc:
MMLF("p%d", b[1])
break;
case 0xfb:
if(b[1] < 16)
MMLF("v%d", b[1])
else
MMLF("@v%d", 255 - b[1])
break;
case 0xfa:
MMLF("(")
break;
case 0xf9:
MMLF(")")
break;
case 0xf8:
if(b[1] <= 8)
MMLF("q%d", b[1])
else
MMLF("@q%d", 256 - b[1])
break;
case 0xf7:
d->next_key_off = 1;
break;
case 0xf6:
MMLF("[")
d->octave = -1;
break;
case 0xf5:
{
int16_t ofs = ((b[1] << 8) | b[2]) + 1;
if(ofs < 0 && pos + ofs >= 0) {
if(chan->data[pos + ofs] > 2)
MMLF("]%d", chan->data[pos + ofs])
else
MMLF("]")
d->octave = -1;
}
}
break;
case 0xf4:
MMLF("/")
break;
case 0xf3:
{
int detune = b[1] << 8 | b[2];
if(detune >= 32768) detune -= 65536;
MMLF("D%d", detune)
}
break;
case 0xf2:
d->portamento = b[1] << 8 | b[2];
if(d->portamento >= 32768) d->portamento = d->portamento - 65536;
break;
case 0xf0:
MMLF("k%d", b[1])
break;
case 0xef:
MMLF("S%C", b[1] >= 8 ? 'P' + b[1] - 8 : 'A' + b[1])
break;
case 0xee:
MMLF("W")
break;
case 0xed:
if(i < 8)
MMLF("w%d", b[1] & 0x1f)
else
MMLF("F%d", b[1])
break;
case 0xec:
if(b[1] == 0x80)
MMLF("MPOF")
else if(b[1] == 0x81)
MMLF("MPON")
else
MMLF("MP%d,%d,%d", b[1], b[2] << 8 | b[3], b[4] >= 128 ? b[4] - 256 : b[4])
break;
case 0xeb:
if(b[1] == 0x80)
MMLF("MAOF")
else if(b[1] == 0x81)
MMLF("MAON")
else
MMLF("MA%d,%d,%d", b[1], b[2] << 8 | b[3], b[4] >= 128 ? b[4] - 256 : b[4])
break;
case 0xea:
if(b[1] == 0x80)
MMLF("MHOF")
else if(b[1] == 0x81)
MMLF("MHON")
else
MMLF("MH%d,%d,%d,%d,%d,%d,%d", b[1] & 0x03, b[2], b[3] & 0x7f, b[4], b[5] >> 4, b[5] & 0x0f, b[1] >> 6)
break;
case 0xe9:
MMLF("MD%d", b[1])
break;
case 0xe8:
// enable PCM8
break;
case 0xe7:
// fade out
break;
}
}
pos += r;
}
if(d->rest_ticks > 0) {
int dot = 0;
int t = ticks_to_division(d->rest_ticks, & dot);
if(t)
MMLF("r%d%s", t, dot ? "." : "")
else
MMLF("r%%%d", d->rest_ticks)
d->rest_ticks = 0;
}
// print out any remaining stuff
if(d->cur_col > 0) {
PRINTMMLLINE(d->buf)
}
}
}