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ibxm.Sample Maven / Gradle / Ivy
package ibxm;
public class Sample {
public String name;
public boolean set_panning;
public int volume, panning;
public int c2_rate, relative_note, fine_tune;
private int loop_start, loop_length;
private short[] sample_data;
/* For the sinc interpolator.*/
private static final int POINT_SHIFT = 4;
private static final int POINTS = 1 << POINT_SHIFT;
private static final int OVERLAP = POINTS >> 1;
private static final int INTERP_SHIFT = IBXM.FP_SHIFT - 4;
private static final int INTERP_BITMASK = ( 1 << INTERP_SHIFT ) - 1;
private static final short[] sinc_table = {
0, -7, 27, -71, 142, -227, 299, 32439, 299, -227, 142, -71, 27, -7, 0, 0,
0, 0, -5, 36, -142, 450, -1439, 32224, 2302, -974, 455, -190, 64, -15, 2, 0,
0, 6, -33, 128, -391, 1042, -2894, 31584, 4540, -1765, 786, -318, 105, -25, 3, 0,
0, 10, -55, 204, -597, 1533, -4056, 30535, 6977, -2573, 1121, -449, 148, -36, 5, 0,
-1, 13, -71, 261, -757, 1916, -4922, 29105, 9568, -3366, 1448, -578, 191, -47, 7, 0,
-1, 15, -81, 300, -870, 2185, -5498, 27328, 12263, -4109, 1749, -698, 232, -58, 9, 0,
-1, 15, -86, 322, -936, 2343, -5800, 25249, 15006, -4765, 2011, -802, 269, -68, 10, 0,
-1, 15, -87, 328, -957, 2394, -5849, 22920, 17738, -5298, 2215, -885, 299, -77, 12, 0,
0, 14, -83, 319, -938, 2347, -5671, 20396, 20396, -5671, 2347, -938, 319, -83, 14, 0,
0, 12, -77, 299, -885, 2215, -5298, 17738, 22920, -5849, 2394, -957, 328, -87, 15, -1,
0, 10, -68, 269, -802, 2011, -4765, 15006, 25249, -5800, 2343, -936, 322, -86, 15, -1,
0, 9, -58, 232, -698, 1749, -4109, 12263, 27328, -5498, 2185, -870, 300, -81, 15, -1,
0, 7, -47, 191, -578, 1448, -3366, 9568, 29105, -4922, 1916, -757, 261, -71, 13, -1,
0, 5, -36, 148, -449, 1121, -2573, 6977, 30535, -4056, 1533, -597, 204, -55, 10, 0,
0, 3, -25, 105, -318, 786, -1765, 4540, 31584, -2894, 1042, -391, 128, -33, 6, 0,
0, 2, -15, 64, -190, 455, -974, 2302, 32224, -1439, 450, -142, 36, -5, 0, 0,
0, 0, -7, 27, -71, 142, -227, 299, 32439, 299, -227, 142, -71, 27, -7, 0
};
public Sample() {
name = "";
c2_rate = 8363;
set_sample_data( new short[ 0 ], 0, 0, false );
}
public void set_sample_data( short[] data, int loop_start, int loop_length, boolean ping_pong ) {
int offset;
short sample;
if( loop_start < 0 ) {
loop_start = 0;
}
if( loop_start >= data.length ) {
loop_start = data.length - 1;
}
if( loop_start + loop_length > data.length ) {
loop_length = data.length - loop_start;
}
if( loop_length <= 1 ) {
sample_data = new short[ OVERLAP + data.length + OVERLAP * 3 ];
System.arraycopy( data, 0, sample_data, OVERLAP, data.length );
offset = 0;
while( offset < OVERLAP ) {
sample = sample_data[ OVERLAP + data.length - 1 ];
sample = ( short ) ( sample * ( OVERLAP - offset ) / OVERLAP );
sample_data[ OVERLAP + data.length + offset ] = sample;
offset += 1;
}
loop_start = OVERLAP + data.length + OVERLAP;
loop_length = 1;
} else {
if( ping_pong ) {
sample_data = new short[ OVERLAP + loop_start + loop_length * 2 + OVERLAP * 2 ];
System.arraycopy( data, 0, sample_data, OVERLAP, loop_start + loop_length );
offset = 0;
while( offset < loop_length ) {
sample = data[ loop_start + loop_length - offset - 1 ];
sample_data[ OVERLAP + loop_start + loop_length + offset ] = sample;
offset += 1;
}
loop_start = loop_start + OVERLAP;
loop_length = loop_length * 2;
} else {
sample_data = new short[ OVERLAP + loop_start + loop_length + OVERLAP * 2 ];
System.arraycopy( data, 0, sample_data, OVERLAP, loop_start + loop_length );
loop_start = loop_start + OVERLAP;
}
offset = 0;
while( offset < OVERLAP * 2 ) {
sample = sample_data[ loop_start + offset ];
sample_data[ loop_start + loop_length + offset ] = sample;
offset += 1;
}
}
this.loop_start = loop_start;
this.loop_length = loop_length;
}
public void resample_nearest(
int sample_idx, int sample_frac, int step, int left_gain, int right_gain,
int[] mix_buffer, int frame_offset, int frames ) {
int offset, end, loop_end;
sample_idx += OVERLAP;
loop_end = loop_start + loop_length - 1;
offset = frame_offset << 1;
end = ( frame_offset + frames - 1 ) << 1;
while( offset <= end ) {
if( sample_idx > loop_end ) {
if( loop_length <= 1 ) {
break;
}
sample_idx = loop_start + ( sample_idx - loop_start ) % loop_length;
}
mix_buffer[ offset ] += sample_data[ sample_idx ] * left_gain >> IBXM.FP_SHIFT;
mix_buffer[ offset + 1 ] += sample_data[ sample_idx ] * right_gain >> IBXM.FP_SHIFT;
offset += 2;
sample_frac += step;
sample_idx += sample_frac >> IBXM.FP_SHIFT;
sample_frac &= IBXM.FP_MASK;
}
}
public void resample_linear(
int sample_idx, int sample_frac, int step, int left_gain, int right_gain,
int[] mix_buffer, int frame_offset, int frames ) {
int offset, end, loop_end, amplitude;
sample_idx += OVERLAP;
loop_end = loop_start + loop_length - 1;
offset = frame_offset << 1;
end = ( frame_offset + frames - 1 ) << 1;
while( offset <= end ) {
if( sample_idx > loop_end ) {
if( loop_length <= 1 ) {
break;
}
sample_idx = loop_start + ( sample_idx - loop_start ) % loop_length;
}
amplitude = sample_data[ sample_idx ];
amplitude += ( sample_data[ sample_idx + 1 ] - amplitude ) * sample_frac >> IBXM.FP_SHIFT;
mix_buffer[ offset ] += amplitude * left_gain >> IBXM.FP_SHIFT;
mix_buffer[ offset + 1 ] += amplitude * right_gain >> IBXM.FP_SHIFT;
offset += 2;
sample_frac += step;
sample_idx += sample_frac >> IBXM.FP_SHIFT;
sample_frac &= IBXM.FP_MASK;
}
}
public void resample_sinc(
int sample_idx, int sample_frac, int step, int left_gain, int right_gain,
int[] mix_buffer, int frame_offset, int frames ) {
int offset, end, loop_end, table_idx, a1, a2, amplitude;
loop_end = loop_start + loop_length - 1;
offset = frame_offset << 1;
end = ( frame_offset + frames - 1 ) << 1;
while( offset <= end ) {
if( sample_idx > loop_end ) {
if( loop_length <= 1 ) {
break;
}
sample_idx = loop_start + ( sample_idx - loop_start ) % loop_length;
}
table_idx = ( sample_frac >> INTERP_SHIFT ) << POINT_SHIFT;
a1 = sinc_table[ table_idx + 0 ] * sample_data[ sample_idx + 0 ] >> 15;
a1 += sinc_table[ table_idx + 1 ] * sample_data[ sample_idx + 1 ] >> 15;
a1 += sinc_table[ table_idx + 2 ] * sample_data[ sample_idx + 2 ] >> 15;
a1 += sinc_table[ table_idx + 3 ] * sample_data[ sample_idx + 3 ] >> 15;
a1 += sinc_table[ table_idx + 4 ] * sample_data[ sample_idx + 4 ] >> 15;
a1 += sinc_table[ table_idx + 5 ] * sample_data[ sample_idx + 5 ] >> 15;
a1 += sinc_table[ table_idx + 6 ] * sample_data[ sample_idx + 6 ] >> 15;
a1 += sinc_table[ table_idx + 7 ] * sample_data[ sample_idx + 7 ] >> 15;
a1 += sinc_table[ table_idx + 8 ] * sample_data[ sample_idx + 8 ] >> 15;
a1 += sinc_table[ table_idx + 9 ] * sample_data[ sample_idx + 9 ] >> 15;
a1 += sinc_table[ table_idx + 10 ] * sample_data[ sample_idx + 10 ] >> 15;
a1 += sinc_table[ table_idx + 11 ] * sample_data[ sample_idx + 11 ] >> 15;
a1 += sinc_table[ table_idx + 12 ] * sample_data[ sample_idx + 12 ] >> 15;
a1 += sinc_table[ table_idx + 13 ] * sample_data[ sample_idx + 13 ] >> 15;
a1 += sinc_table[ table_idx + 14 ] * sample_data[ sample_idx + 14 ] >> 15;
a1 += sinc_table[ table_idx + 15 ] * sample_data[ sample_idx + 15 ] >> 15;
a2 = sinc_table[ table_idx + 16 ] * sample_data[ sample_idx + 0 ] >> 15;
a2 += sinc_table[ table_idx + 17 ] * sample_data[ sample_idx + 1 ] >> 15;
a2 += sinc_table[ table_idx + 18 ] * sample_data[ sample_idx + 2 ] >> 15;
a2 += sinc_table[ table_idx + 19 ] * sample_data[ sample_idx + 3 ] >> 15;
a2 += sinc_table[ table_idx + 20 ] * sample_data[ sample_idx + 4 ] >> 15;
a2 += sinc_table[ table_idx + 21 ] * sample_data[ sample_idx + 5 ] >> 15;
a2 += sinc_table[ table_idx + 22 ] * sample_data[ sample_idx + 6 ] >> 15;
a2 += sinc_table[ table_idx + 23 ] * sample_data[ sample_idx + 7 ] >> 15;
a2 += sinc_table[ table_idx + 24 ] * sample_data[ sample_idx + 8 ] >> 15;
a2 += sinc_table[ table_idx + 25 ] * sample_data[ sample_idx + 9 ] >> 15;
a2 += sinc_table[ table_idx + 26 ] * sample_data[ sample_idx + 10 ] >> 15;
a2 += sinc_table[ table_idx + 27 ] * sample_data[ sample_idx + 11 ] >> 15;
a2 += sinc_table[ table_idx + 28 ] * sample_data[ sample_idx + 12 ] >> 15;
a2 += sinc_table[ table_idx + 29 ] * sample_data[ sample_idx + 13 ] >> 15;
a2 += sinc_table[ table_idx + 30 ] * sample_data[ sample_idx + 14 ] >> 15;
a2 += sinc_table[ table_idx + 31 ] * sample_data[ sample_idx + 15 ] >> 15;
amplitude = a1 + ( ( a2 - a1 ) * ( sample_frac & INTERP_BITMASK ) >> INTERP_SHIFT );
mix_buffer[ offset ] += amplitude * left_gain >> IBXM.FP_SHIFT;
mix_buffer[ offset + 1 ] += amplitude * right_gain >> IBXM.FP_SHIFT;
offset += 2;
sample_frac += step;
sample_idx += sample_frac >> IBXM.FP_SHIFT;
sample_frac &= IBXM.FP_MASK;
}
}
public boolean has_finished( int sample_idx ) {
boolean finished;
finished = false;
if( loop_length <= 1 && sample_idx > loop_start ) {
finished = true;
}
return finished;
}
}
