344 lines
10 KiB
Java
344 lines
10 KiB
Java
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package ibxm;
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public class IBXM {
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public static final String VERSION = "ibxm alpha 51 (c)2008 mumart@gmail.com";
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public static final int FP_SHIFT = 15;
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public static final int FP_ONE = 1 << FP_SHIFT;
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public static final int FP_MASK = FP_ONE - 1;
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private int sampling_rate, resampling_quality, volume_ramp_length;
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private int tick_length_samples, current_tick_samples;
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private int[] mixing_buffer, volume_ramp_buffer;
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private Module module;
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private Channel[] channels;
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private int[] global_volume, note;
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private int current_sequence_index, next_sequence_index;
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private int current_row, next_row;
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private int tick_counter, ticks_per_row;
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private int pattern_loop_count, pattern_loop_channel;
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public IBXM( int sample_rate ) {
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/** MODIFIED 13 Oct 2009 by Paul Lamb **/
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// System.out.println( VERSION );
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/***************************************/
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if( sample_rate < 8000 ) {
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sample_rate = 8000;
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}
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sampling_rate = sample_rate;
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volume_ramp_length = sampling_rate >> 10;
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volume_ramp_buffer = new int[ volume_ramp_length * 2 ];
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mixing_buffer = new int[ sampling_rate / 6 ];
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global_volume = new int[ 1 ];
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note = new int[ 5 ];
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set_module( new Module() );
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set_resampling_quality( 1 );
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}
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public void set_module( Module m ) {
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int channel_idx;
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module = m;
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channels = new Channel[ module.get_num_channels() ];
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for( channel_idx = 0; channel_idx < channels.length; channel_idx++ ) {
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channels[ channel_idx ] = new Channel( module, sampling_rate, global_volume );
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}
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set_sequence_index( 0, 0 );
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}
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public void set_resampling_quality( int quality ) {
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resampling_quality = quality;
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}
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public int calculate_song_duration() {
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int song_duration;
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set_sequence_index( 0, 0 );
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next_tick();
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song_duration = tick_length_samples;
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while( !next_tick() ) {
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song_duration += tick_length_samples;
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}
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set_sequence_index( 0, 0 );
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return song_duration;
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}
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public void set_sequence_index( int sequence_index, int row ) {
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int channel_idx;
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global_volume[ 0 ] = 64;
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for( channel_idx = 0; channel_idx < channels.length; channel_idx++ ) {
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channels[ channel_idx ].reset();
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channels[ channel_idx ].set_panning( module.get_initial_panning( channel_idx ) );
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}
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set_global_volume( module.global_volume );
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set_speed( 6 );
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set_speed( module.default_speed );
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set_tempo( 125 );
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set_tempo( module.default_tempo );
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pattern_loop_count = -1;
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next_sequence_index = sequence_index;
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next_row = row;
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tick_counter = 0;
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current_tick_samples = tick_length_samples;
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clear_vol_ramp_buffer();
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}
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public void seek( int sample_position ) {
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int idx;
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set_sequence_index( 0, 0 );
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next_tick();
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while( sample_position > tick_length_samples ) {
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sample_position -= tick_length_samples;
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next_tick();
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}
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mix_tick();
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current_tick_samples = sample_position;
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}
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public void get_audio( byte[] output_buffer, int frames ) {
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int output_idx, mix_idx, mix_end, count, amplitude;
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output_idx = 0;
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while( frames > 0 ) {
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count = tick_length_samples - current_tick_samples;
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if( count > frames ) {
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count = frames;
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}
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mix_idx = current_tick_samples << 1;
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mix_end = mix_idx + ( count << 1 ) - 1;
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while( mix_idx <= mix_end ) {
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amplitude = mixing_buffer[ mix_idx ];
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if( amplitude > 32767 ) {
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amplitude = 32767;
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}
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if( amplitude < -32768 ) {
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amplitude = -32768;
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}
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output_buffer[ output_idx ] = ( byte ) ( amplitude >> 8 );
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output_buffer[ output_idx + 1 ] = ( byte ) ( amplitude & 0xFF );
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output_idx += 2;
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mix_idx += 1;
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}
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current_tick_samples = mix_idx >> 1;
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frames -= count;
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if( frames > 0 ) {
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next_tick();
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mix_tick();
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current_tick_samples = 0;
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}
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}
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}
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private void mix_tick() {
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int channel_idx, mix_idx, mix_len;
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mix_idx = 0;
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mix_len = tick_length_samples + volume_ramp_length << 1;
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while( mix_idx < mix_len ) {
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mixing_buffer[ mix_idx ] = 0;
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mix_idx += 1;
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}
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for( channel_idx = 0; channel_idx < channels.length; channel_idx++ ) {
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mix_len = tick_length_samples + volume_ramp_length;
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channels[ channel_idx ].resample( mixing_buffer, 0, mix_len, resampling_quality );
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}
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volume_ramp();
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}
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private boolean next_tick() {
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int channel_idx;
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boolean song_end;
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for( channel_idx = 0; channel_idx < channels.length; channel_idx++ ) {
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channels[ channel_idx ].update_sample_idx( tick_length_samples );
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}
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tick_counter -= 1;
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if( tick_counter <= 0 ) {
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tick_counter = ticks_per_row;
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song_end = next_row();
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} else {
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for( channel_idx = 0; channel_idx < channels.length; channel_idx++ ) {
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channels[ channel_idx ].tick();
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}
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song_end = false;
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}
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return song_end;
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}
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private boolean next_row() {
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int channel_idx, effect, effect_param;
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boolean song_end;
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Pattern pattern;
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song_end = false;
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if( next_sequence_index < 0 ) {
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/* Bad next sequence index.*/
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next_sequence_index = 0;
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next_row = 0;
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}
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if( next_sequence_index >= module.get_sequence_length() ) {
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/* End of sequence.*/
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song_end = true;
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next_sequence_index = module.restart_sequence_index;
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if( next_sequence_index < 0 ) {
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next_sequence_index = 0;
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}
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if( next_sequence_index >= module.get_sequence_length() ) {
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next_sequence_index = 0;
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}
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next_row = 0;
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}
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if( next_sequence_index < current_sequence_index ) {
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/* Jump to previous pattern. */
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song_end = true;
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}
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if( next_sequence_index == current_sequence_index ) {
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if( next_row <= current_row ) {
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if( pattern_loop_count < 0 ) {
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/* Jump to previous row in the same pattern, but not a pattern loop. */
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song_end = true;
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}
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}
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}
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current_sequence_index = next_sequence_index;
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pattern = module.get_pattern_from_sequence( current_sequence_index );
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if( next_row < 0 || next_row >= pattern.num_rows ) {
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/* Bad next row.*/
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next_row = 0;
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}
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current_row = next_row;
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next_row = current_row + 1;
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if( next_row >= pattern.num_rows ) {
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next_sequence_index = current_sequence_index + 1;
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next_row = 0;
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}
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for( channel_idx = 0; channel_idx < channels.length; channel_idx++ ) {
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pattern.get_note( note, current_row * channels.length + channel_idx );
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effect = note[ 3 ];
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effect_param = note[ 4 ];
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channels[ channel_idx ].row( note[ 0 ], note[ 1 ], note[ 2 ], effect, effect_param );
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switch( effect ) {
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case 0x0B:
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/* Pattern Jump.*/
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if( pattern_loop_count < 0 ) {
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next_sequence_index = effect_param;
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next_row = 0;
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}
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break;
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case 0x0D:
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/* Pattern Break.*/
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if( pattern_loop_count < 0 ) {
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next_sequence_index = current_sequence_index + 1;
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next_row = ( effect_param >> 4 ) * 10 + ( effect_param & 0x0F );
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}
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break;
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case 0x0E:
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/* Extended.*/
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switch( effect_param & 0xF0 ) {
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case 0x60:
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/* Pattern loop.*/
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if( ( effect_param & 0x0F ) == 0 ) {
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/* Set loop marker on this channel. */
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channels[ channel_idx ].pattern_loop_row = current_row;
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}
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if( channels[ channel_idx ].pattern_loop_row < current_row ) {
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/* Marker and parameter are valid. Begin looping. */
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if( pattern_loop_count < 0 ) {
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/* Not already looping, begin. */
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pattern_loop_count = effect_param & 0x0F;
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pattern_loop_channel = channel_idx;
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}
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if( pattern_loop_channel == channel_idx ) {
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/* Loop in progress on this channel. Next iteration. */
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if( pattern_loop_count == 0 ) {
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/* Loop finished. */
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/* Invalidate current marker. */
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channels[ channel_idx ].pattern_loop_row = current_row + 1;
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} else {
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/* Count must be higher than zero. */
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/* Loop and cancel any breaks on this row. */
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next_row = channels[ channel_idx ].pattern_loop_row;
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next_sequence_index = current_sequence_index;
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}
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pattern_loop_count -= 1;
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}
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}
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break;
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case 0xE0:
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/* Pattern delay.*/
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tick_counter += ticks_per_row * ( effect_param & 0x0F );
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break;
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}
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break;
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case 0x0F:
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/* Set Speed/Tempo.*/
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if( effect_param < 32 ) {
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set_speed( effect_param );
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tick_counter = ticks_per_row;
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} else {
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set_tempo( effect_param );
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}
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break;
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case 0x25:
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/* S3M Set Speed.*/
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set_speed( effect_param );
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tick_counter = ticks_per_row;
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break;
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}
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}
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return song_end;
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}
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private void set_global_volume( int volume ) {
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if( volume < 0 ) {
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volume = 0;
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}
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if( volume > 64 ) {
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volume = 64;
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}
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global_volume[ 0 ] = volume;
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}
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private void set_speed( int speed ) {
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if( speed > 0 && speed < 256 ) {
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ticks_per_row = speed;
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}
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}
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private void set_tempo( int bpm ) {
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if( bpm > 31 && bpm < 256 ) {
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tick_length_samples = ( sampling_rate * 5 ) / ( bpm * 2 );
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}
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}
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private void volume_ramp() {
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int ramp_idx, next_idx, ramp_end;
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int volume_ramp_delta, volume, sample;
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sample = 0;
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volume_ramp_delta = FP_ONE / volume_ramp_length;
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volume = 0;
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ramp_idx = 0;
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next_idx = 2 * tick_length_samples;
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ramp_end = volume_ramp_length * 2 - 1;
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while( ramp_idx <= ramp_end ) {
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sample = volume_ramp_buffer[ ramp_idx ] * ( FP_ONE - volume ) >> FP_SHIFT;
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mixing_buffer[ ramp_idx ] = sample + ( mixing_buffer[ ramp_idx ] * volume >> FP_SHIFT );
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volume_ramp_buffer[ ramp_idx ] = mixing_buffer[ next_idx + ramp_idx ];
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sample = volume_ramp_buffer[ ramp_idx + 1 ] * ( FP_ONE - volume ) >> FP_SHIFT;
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mixing_buffer[ ramp_idx + 1 ] = sample + ( mixing_buffer[ ramp_idx + 1 ] * volume >> FP_SHIFT );
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volume_ramp_buffer[ ramp_idx + 1 ] = mixing_buffer[ next_idx + ramp_idx + 1 ];
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volume += volume_ramp_delta;
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ramp_idx += 2;
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}
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}
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private void clear_vol_ramp_buffer() {
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int ramp_idx, ramp_end;
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ramp_idx = 0;
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ramp_end = volume_ramp_length * 2 - 1;
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while( ramp_idx <= ramp_end ) {
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volume_ramp_buffer[ ramp_idx ] = 0;
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ramp_idx += 1;
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}
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}
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}
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