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package micromod;
/**
* micromod/e fast module player (rev b)
*/
public class Micromod {
private final int
FP_SHIFT = 13,
FP_ONE = 1 << FP_SHIFT,
IN_STRUCT_LEN = 0x05,
IN_SAMPLE_INDEX = 0x00,
IN_LOOP_START = 0x01,
IN_LOOP_END = 0x02,
IN_VOLUME = 0x03,
IN_FINETUNE = 0x04,
CH_STRUCT_LEN = 0x16,
CH_SPOS = 0x00,
CH_STEP = 0x01,
CH_AMPL = 0x02,
CH_INSTRUMENT = 0x03,
CH_ASSIGNED = 0x04,
CH_VOLUME = 0x05,
CH_FINETUNE = 0x06,
CH_PERIOD = 0x07,
CH_PORTA_PERIOD = 0x08,
CH_PORTA_PARAM = 0x09,
CH_PANNING = 0x0A,
CH_ARPEGGIO = 0x0B,
CH_VIBR_PERIOD = 0x0C,
CH_VIBR_PARAM = 0x0D,
CH_VIBR_COUNT = 0x0E,
CH_TREM_VOLUME = 0x0F,
CH_TREM_PARAM = 0x10,
CH_PAT_LOOP_ROW = 0x11,
CH_NOTE_PERIOD = 0x12,
CH_NOTE_INSTRU = 0x13,
CH_NOTE_EFFECT = 0x14,
CH_NOTE_EPARAM = 0x15,
FX_ARPEGGIO = 0x00,
FX_PORTA_UP = 0x01,
FX_PORTA_DOWN = 0x02,
FX_TONE_PORTA = 0x03,
FX_VIBRATO = 0x04,
FX_TPORTA_VOL = 0x05,
FX_VIBRATO_VOL = 0x06,
FX_TREMOLO = 0x07,
FX_SET_PANNING = 0x08,
FX_SET_SPOS = 0x09,
FX_VOLUME_SLIDE = 0x0A,
FX_PAT_JUMP = 0x0B,
FX_SET_VOLUME = 0x0C,
FX_PAT_BREAK = 0x0D,
FX_EXTENDED = 0x0E,
FX_SET_SPEED = 0x0F,
EX_FINE_PORT_UP = 0x10,
EX_FINE_PORT_DN = 0x20,
EX_SET_GLISS = 0x30,
EX_SET_VIBR_WAV = 0x40,
EX_SET_FINETUNE = 0x50,
EX_PAT_LOOP = 0x60,
EX_SET_TREM_WAV = 0x70,
EX_SET_PANNING = 0x80,
EX_RETRIG = 0x90,
EX_FINE_VOL_UP = 0xA0,
EX_FINE_VOL_DN = 0xB0,
EX_NOTE_CUT = 0xC0,
EX_NOTE_DELAY = 0xD0,
EX_PAT_DELAY = 0xE0,
EX_INVERT_LOOP = 0xF0;
private final int[] arptable = new int[] {
8192, 8679, 9195, 9742, 10321, 10935, 11585, 12274,
13004, 13777, 14596, 15464, 16384, 17358, 18390, 19484
};
private final int[] fttable = new int[] {
15464, 15576, 15689, 15803, 15918, 16033, 16149, 16266,
16384, 16503, 16622, 16743, 16864, 16986, 17109, 17233
};
private final int[] sintable = new int[] {
0, 24 , 49, 74, 97, 120, 141, 161, 180, 197, 212, 224, 235, 244, 250, 253,
255, 253, 250, 244, 235, 224, 212, 197, 180, 161, 141, 120, 97, 74, 49, 24
};
private byte[] mod;
private boolean amiga;
private int numchan, songlen, restart;
private int pat, npat, row, nrow, tick, tempo, bpm;
private int fcount, loopcount, loopchan;
private int[] instruments = new int[ IN_STRUCT_LEN * 32 ];
private int[] channels = new int[ CH_STRUCT_LEN * 32 ];
private int samplerate, tickremain;
/* constructor ( mod - module data ) */
/**
* Constructor
* @param mod byte buffer containing MOD data
* @param samplerate sample rate in Hertz
*/
public Micromod( final byte[] mod, final int samplerate ) {
this.mod = mod;
this.samplerate = samplerate;
//System.out.println( "micromod/e (c)2005 mumart@gmail.com" );
songlen = mod[ 950 ] & 0x7F;
restart = mod[ 951 ] & 0x7F;
if( restart >= songlen ) restart = 0;
int numpatterns = 0;
for( int n = 0; n < 128; n++ ) {
int pat = mod[ 952 + n ] & 0x7F;
if( pat >= numpatterns ) numpatterns = pat + 1;
}
switch( ( mod[ 1082 ] << 8 ) | mod[ 1083 ] ) {
case 0x4b2e: // M.K.
case 0x4b21: // M!K!
case 0x5434: // FLT4
numchan = 4;
amiga = true;
break;
case 0x484e: // xCHN
numchan = mod[ 1080 ] - 48;
amiga = false;
break;
case 0x4348: // xxCH
numchan = ( ( mod[ 1080 ] - 48 ) * 10 ) + ( mod[ 1081 ] - 48 );
amiga = false;
break;
default:
throw new IllegalArgumentException( "MOD Format not recognised!" );
}
int sampleidx = 1084 + 4 * numchan * 64 * numpatterns;
for( int inst = 0; inst < 31; inst++ ) {
int slen = ushortbe( mod, inst * 30 + 42 ) << 1;
int fine = mod[ inst * 30 + 44 ] & 0xF;
if( fine > 7 ) fine -= 16;
int vol = mod[ inst * 30 + 45 ] & 0x7F;
if( vol > 64 ) vol = 64;
int lsta = ushortbe( mod, inst * 30 + 46 ) << 1;
int llen = ushortbe( mod, inst * 30 + 48 ) << 1;
if( sampleidx + slen - 1 >= mod.length ) {
System.out.println( "Module is truncated!" );
slen = mod.length - sampleidx;
if( slen < 0 ) slen = 0;
}
if( llen < 4 || lsta >= slen ) {
lsta = slen - 1;
llen = 1;
}
int lend = lsta + llen - 1;
if( lend >= slen ) lend = slen - 1;
int ioffset = ( inst + 1 ) * IN_STRUCT_LEN;
instruments[ ioffset + IN_SAMPLE_INDEX ] = sampleidx;
instruments[ ioffset + IN_LOOP_START ] = lsta;
instruments[ ioffset + IN_LOOP_END ] = lend;
instruments[ ioffset + IN_FINETUNE ] = fine;
instruments[ ioffset + IN_VOLUME ] = vol;
sampleidx += slen;
}
reset();
}
/**
* return the song length in samples
* @return song length in samples
*/
public int getlen() {
reset();
int len = getticklen();
while( !tick() ) len += getticklen();
reset();
return len;
}
/**
* Mix 16 bit stereo audio into the buffers.
* @param l left
* @param r right
* @param ofs offset
* @param length length
*/
public void mix( final int[] l, final int[] r, final int ofs, final int length ) {
int len = length;
int offset = ofs;
while( len > 0 ) {
int count = tickremain;
if( count > len ) count = len;
for( int chan = 0; chan < numchan ; chan++ ) {
int coffset = chan * CH_STRUCT_LEN;
int ampl = channels[ coffset + CH_AMPL ];
int pann = channels[ coffset + CH_PANNING ] << FP_SHIFT - 8;
int lamp = ampl * ( FP_ONE - pann ) >> FP_SHIFT;
int ramp = ampl * pann >> FP_SHIFT;
int inst = channels[ coffset + CH_INSTRUMENT ];
int ioffset = inst * IN_STRUCT_LEN;
int sidx = instruments[ ioffset + IN_SAMPLE_INDEX ];
int lsta = instruments[ ioffset + IN_LOOP_START ] << FP_SHIFT;
int lep1 = instruments[ ioffset + IN_LOOP_END ] + 1 << FP_SHIFT;
int spos = channels[ coffset + CH_SPOS ];
int step = channels[ coffset + CH_STEP ];
int llen = lep1 - lsta;
boolean dontmix = llen <= FP_ONE && spos >= lsta;
if( !dontmix ) for( int x = 0; x < count; x++ ) {
while( spos >= lep1 ) spos -= llen;
int sample = mod[ sidx + ( spos >> FP_SHIFT ) ] << 8;
l[ offset + x ] += sample * lamp >> FP_SHIFT;
r[ offset + x ] += sample * ramp >> FP_SHIFT;
spos += step;
}
channels[ coffset + CH_SPOS ] = spos;
}
tickremain -= count;
if( tickremain == 0 ) {
tick();
tickremain = getticklen();
}
offset += count;
len -= count;
}
}
private void reset() {
pat = npat = 0;
row = nrow = 0;
tick = tempo = 6;
bpm = 125;
loopcount = loopchan = 0;
for( int n = 0; n < channels.length; n++ ) channels[ n ] = 0;
for( int chan = 0; chan < numchan; chan++ ) {
int p = 128;
switch( chan & 0x3 ) {
case 0: p = 64; break;
case 1: p = 192; break;
case 2: p = 192; break;
case 3: p = 64; break;
}
channels[ chan * CH_STRUCT_LEN + CH_PANNING ] = p;
}
row();
tickremain = getticklen();
}
private boolean tick() {
tick--;
if( tick <= 0 ) {
tick = tempo;
return row();
}
// Update channel fx
for( int chan = 0; chan < numchan; chan++ ) {
int coffset = chan * CH_STRUCT_LEN;
int effect = channels[ coffset + CH_NOTE_EFFECT ];
int eparam = channels[ coffset + CH_NOTE_EPARAM ];
switch( effect ) {
case FX_ARPEGGIO:
switch( fcount % 3 ) {
case 0: channels[ coffset + CH_ARPEGGIO ] = 0; break;
case 1: channels[ coffset + CH_ARPEGGIO ] = ( eparam & 0xF0 ) >> 4; break;
case 2: channels[ coffset + CH_ARPEGGIO ] = eparam & 0x0F; break;
}
break;
case FX_PORTA_UP:
channels[ coffset + CH_PERIOD ] -= eparam;
break;
case FX_PORTA_DOWN:
channels[ coffset + CH_PERIOD ] += eparam;
break;
case FX_TONE_PORTA:
toneporta( coffset );
break;
case FX_VIBRATO:
vibrato( coffset );
break;
case FX_TPORTA_VOL:
volslide( coffset, eparam );
toneporta( coffset );
break;
case FX_VIBRATO_VOL:
volslide( coffset, eparam );
vibrato( coffset );
break;
case FX_TREMOLO:
tremolo( coffset );
break;
case FX_VOLUME_SLIDE:
volslide( coffset, eparam );
break;
case FX_EXTENDED:
switch( eparam & 0xF0 ) {
case EX_RETRIG:
int rtparam = eparam & 0x0F;
if( rtparam == 0 ) rtparam = 1;
if( fcount % rtparam == 0 ) channels[ coffset + CH_SPOS ] = 0;
break;
case EX_NOTE_CUT:
if( ( eparam & 0x0F ) == fcount ) channels[ coffset + CH_VOLUME ] = 0;
break;
case EX_NOTE_DELAY:
if( ( eparam & 0x0F ) == fcount ) trigger( coffset );
break;
}
break;
}
channels[ coffset + CH_VIBR_COUNT ]++;
}
mixupdate();
fcount++;
return false;
}
private boolean row() {
// Decide whether to restart.
boolean songend = false;
if( npat < pat ) songend = true;
if( npat == pat && nrow <= row && loopcount <= 0 ) songend = true;
// Jump to next row
pat = npat;
row = nrow;
// Decide next row.
nrow = row + 1;
if( nrow == 64 ) {
npat = pat + 1;
nrow = 0;
}
// Load channels and process fx
fcount = 0;
int poffset = mod[ 952 + pat ] & 0x7F;
int roffset = 1084 + ( poffset * 64 * numchan * 4 ) + ( row * numchan * 4 );
for( int chan = 0; chan < numchan; chan++ ) {
int coffset = chan * CH_STRUCT_LEN;
int noffset = roffset + ( chan * 4 );
channels[ coffset + CH_NOTE_PERIOD ] = ( mod[ noffset + 1 ] & 0xFF ) | ( ( mod[ noffset ] & 0x0F ) << 8 );
channels[ coffset + CH_NOTE_INSTRU ] = ( ( mod[ noffset + 2 ] & 0xF0 ) >> 4 ) | ( mod[ noffset ] & 0x10 );
channels[ coffset + CH_NOTE_EFFECT ] = mod[ noffset + 2 ] & 0x0F;
channels[ coffset + CH_NOTE_EPARAM ] = mod[ noffset + 3 ] & 0xFF;
int effect = channels[ coffset + CH_NOTE_EFFECT ];
int eparam = channels[ coffset + CH_NOTE_EPARAM ];
if( !( effect == FX_EXTENDED && ( ( eparam & 0xF0 ) == EX_NOTE_DELAY ) ) ) trigger( coffset );
channels[ coffset + CH_ARPEGGIO ] = 0;
channels[ coffset + CH_VIBR_PERIOD ] = 0;
channels[ coffset + CH_TREM_VOLUME ] = 0;
switch( effect ) {
case FX_ARPEGGIO:
break;
case FX_PORTA_UP:
break;
case FX_PORTA_DOWN:
break;
case FX_TONE_PORTA:
if( eparam != 0 ) channels[ coffset + CH_PORTA_PARAM ] = eparam;
break;
case FX_VIBRATO:
if( eparam != 0 ) channels[ coffset + CH_VIBR_PARAM ] = eparam;
vibrato( coffset );
break;
case FX_TPORTA_VOL:
break;
case FX_VIBRATO_VOL:
vibrato( coffset );
break;
case FX_TREMOLO:
if( eparam != 0 ) channels[ coffset + CH_TREM_PARAM ] = eparam;
tremolo( coffset );
break;
case FX_SET_PANNING:
if( !amiga ) channels[ coffset + CH_PANNING ] = eparam;
break;
case FX_SET_SPOS:
channels[ coffset + CH_SPOS ] = eparam << FP_SHIFT + 8;
break;
case FX_VOLUME_SLIDE:
break;
case FX_PAT_JUMP:
if( loopcount <= 0 ) {
npat = eparam;
nrow = 0;
}
break;
case FX_SET_VOLUME:
channels[ coffset + CH_VOLUME ] = ( eparam > 64 ) ? 64 : eparam;
break;
case FX_PAT_BREAK:
if( loopcount <= 0 ) {
npat = pat + 1;
nrow = ( ( eparam & 0xF0 ) >> 4 ) * 10 + ( eparam & 0x0F );
}
break;
case FX_EXTENDED:
switch( eparam & 0xF0 ) {
case EX_FINE_PORT_UP:
channels[ coffset + CH_PERIOD ] -= ( eparam & 0x0F );
break;
case EX_FINE_PORT_DN:
channels[ coffset + CH_PERIOD ] += ( eparam & 0x0F );
break;
case EX_SET_GLISS:
break;
case EX_SET_VIBR_WAV:
break;
case EX_SET_FINETUNE:
int ftval = eparam & 0x0F;
if( ftval > 7 ) ftval -= 16;
channels[ coffset + CH_FINETUNE ] = ftval;
break;
case EX_PAT_LOOP:
int plparam = eparam & 0x0F;
if( plparam == 0 ) channels[ coffset + CH_PAT_LOOP_ROW ] = row;
if( plparam > 0 && channels[ coffset + CH_PAT_LOOP_ROW ] < row ) {
if( loopcount <= 0 ) {
loopcount = plparam;
loopchan = chan;
nrow = channels[ coffset + CH_PAT_LOOP_ROW ];
npat = pat;
} else if( loopchan == chan ) {
if( loopcount == 1 ) {
channels[ coffset + CH_PAT_LOOP_ROW ] = row + 1;
} else {
nrow = channels[ coffset + CH_PAT_LOOP_ROW ];
npat = pat;
}
loopcount--;
}
}
break;
case EX_SET_TREM_WAV:
break;
case EX_SET_PANNING:
break;
case EX_RETRIG:
break;
case EX_FINE_VOL_UP:
int fvolup = channels[ coffset + CH_VOLUME ] + ( eparam & 0x0F );
if( fvolup > 64 ) fvolup = 64;
channels[ coffset + CH_VOLUME ] = fvolup;
break;
case EX_FINE_VOL_DN:
int fvoldn = channels[ coffset + CH_VOLUME ] - ( eparam & 0x0F );
if( fvoldn > 64 ) fvoldn = 0;
channels[ coffset + CH_VOLUME ] = fvoldn;
break;
case EX_NOTE_CUT:
if( ( eparam & 0x0F ) == fcount ) channels[ coffset + CH_VOLUME ] = 0;
break;
case EX_NOTE_DELAY:
if( ( eparam & 0x0F ) == fcount ) trigger( coffset );
break;
case EX_PAT_DELAY:
tick = tempo + tempo * ( eparam & 0x0F );
break;
case EX_INVERT_LOOP:
break;
}
break;
case FX_SET_SPEED:
if( eparam < 32 ) tick = tempo = eparam;
else bpm = eparam;
break;
}
}
mixupdate();
fcount++;
if( npat >= songlen ) npat = restart;
if( nrow >= 64 ) nrow = 0;
return songend;
}
private void trigger( final int coffset ) {
int period = channels[ coffset + CH_NOTE_PERIOD ];
int instru = channels[ coffset + CH_NOTE_INSTRU ];
int effect = channels[ coffset + CH_NOTE_EFFECT ];
if( instru != 0 ) {
channels[ coffset + CH_ASSIGNED ] = instru;
int ioffset = instru * IN_STRUCT_LEN;
channels[ coffset + CH_VOLUME ] = instruments[ ioffset + IN_VOLUME ];
channels[ coffset + CH_FINETUNE ] = instruments[ ioffset + IN_FINETUNE ];
if( amiga ) {
int atlsta = instruments[ ioffset + IN_LOOP_START ];
int atlend = instruments[ ioffset + IN_LOOP_END ];
if( atlend > atlsta ) channels[ coffset + CH_INSTRUMENT ] = instru;
}
}
if( period != 0 ) {
channels[ coffset + CH_INSTRUMENT ] = channels[ coffset + CH_ASSIGNED ];
channels[ coffset + CH_PORTA_PERIOD ] = period;
if( effect != FX_TONE_PORTA && effect != FX_TPORTA_VOL ) {
channels[ coffset + CH_PERIOD ] = period;
channels[ coffset + CH_SPOS ] = 0;
}
channels[ coffset + CH_VIBR_COUNT ] = 0;
}
}
private void volslide( final int coffset, final int eparam ) {
int vol = channels[ coffset + CH_VOLUME ];
vol += ( eparam & 0xF0 ) >> 4;
vol -= eparam & 0x0F;
if( vol > 64 ) vol = 64;
if( vol < 0 ) vol = 0;
channels[ coffset + CH_VOLUME ] = vol;
}
private void toneporta( final int coffset ) {
int sp = channels[ coffset + CH_PERIOD ];
int dp = channels[ coffset + CH_PORTA_PERIOD ];
if( sp < dp ) {
sp += channels[ coffset + CH_PORTA_PARAM ];
if( sp > dp ) sp = dp;
}
if( sp > dp ) {
sp -= channels[ coffset + CH_PORTA_PARAM ];
if( sp < dp ) sp = dp;
}
channels[ coffset + CH_PERIOD ] = sp;
}
private void vibrato( final int coffset ) {
int vparam = channels[ coffset + CH_VIBR_PARAM ];
int vspeed = ( vparam & 0xF0 ) >> 4;
int vdepth = vparam & 0x0F;
int vibpos = vspeed * channels[ coffset + CH_VIBR_COUNT ];
int tval = sintable[ vibpos & 0x1F ];
if( ( vibpos & 0x20 ) > 0 ) tval = -tval;
channels[ coffset + CH_VIBR_PERIOD ] = tval * vdepth >> 7;
}
private void tremolo( final int coffset ) {
int tparam = channels[ coffset + CH_TREM_PARAM ];
int tspeed = ( tparam & 0xF0 ) >> 4;
int tdepth = tparam & 0x0F;
int trempos = tspeed * channels[ coffset + CH_VIBR_COUNT ];
int tval = sintable[ trempos & 0x1F ];
if( ( trempos & 0x20 ) > 0 ) tval = -tval;
channels[ coffset + CH_TREM_VOLUME ] = tval * tdepth >> 7;
}
private void mixupdate() {
for( int chan = 0; chan < numchan; chan++ ) {
int coffset = chan * CH_STRUCT_LEN;
int a = channels[ coffset + CH_VOLUME ] + channels[ coffset + CH_TREM_VOLUME ];
if( a < 0 ) a = 0;
if( a > 64 ) a = 64;
channels[ coffset + CH_AMPL ] = a << FP_SHIFT - 8;
int p = channels[ coffset + CH_PERIOD ] + channels[ coffset + CH_VIBR_PERIOD ];
if( p < 27 ) p = 27;
int clk = amiga ? 3546894 : 3579364;
int s = ( clk / p << FP_SHIFT ) / samplerate;
s = s * fttable[ channels[ coffset + CH_FINETUNE ] + 8 ] >> 14;
s = s * arptable[ channels[ coffset + CH_ARPEGGIO ] ] >> 13;
channels[ coffset + CH_STEP ] = s;
}
}
private int getticklen() {
return ( ( samplerate << 1 ) + ( samplerate >> 1 ) ) / bpm;
}
private int ushortbe( final byte[] buf, final int offset ) {
return ( ( buf[ offset ] & 0xFF ) << 8 ) | ( buf[ offset + 1 ] & 0xFF );
}
}
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