257 lines
10 KiB
Java
257 lines
10 KiB
Java
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package ibxm;
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import java.io.*;
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public class FastTracker2 {
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public static boolean is_xm( byte[] header_60_bytes ) {
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String xm_identifier;
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xm_identifier = ascii_text( header_60_bytes, 0, 17 );
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return xm_identifier.equals( "Extended Module: " );
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}
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public static Module load_xm( byte[] header_60_bytes, DataInput data_input ) throws IOException {
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int xm_version, song_header_length, sequence_length;
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int num_channels, num_patterns, num_instruments, xm_flags, idx;
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byte[] structure_header, song_header;
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boolean delta_env;
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String tracker_name;
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Instrument instrument;
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Module module;
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if( !is_xm( header_60_bytes ) ) {
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throw new IllegalArgumentException( "Not an XM file!" );
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}
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xm_version = unsigned_short_le( header_60_bytes, 58 );
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if( xm_version != 0x0104 ) {
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throw new IllegalArgumentException( "Sorry, XM version " + xm_version + " is not supported!" );
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}
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module = new Module();
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module.song_title = ascii_text( header_60_bytes, 17, 20 );
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tracker_name = ascii_text( header_60_bytes, 38, 20 );
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delta_env = tracker_name.startsWith( "DigiBooster Pro" );
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structure_header = new byte[ 4 ];
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data_input.readFully( structure_header );
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song_header_length = int_le( structure_header, 0 );
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song_header = new byte[ song_header_length ];
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data_input.readFully( song_header, 4, song_header_length - 4 );
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sequence_length = unsigned_short_le( song_header, 4 );
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module.restart_sequence_index = unsigned_short_le( song_header, 6 );
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num_channels = unsigned_short_le( song_header, 8 );
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num_patterns = unsigned_short_le( song_header, 10 );
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num_instruments = unsigned_short_le( song_header, 12 );
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xm_flags = unsigned_short_le( song_header, 14 );
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module.linear_periods = ( xm_flags & 0x1 ) == 0x1;
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module.global_volume = 64;
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module.channel_gain = IBXM.FP_ONE * 3 / 8;
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module.default_speed = unsigned_short_le( song_header, 16 );
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module.default_tempo = unsigned_short_le( song_header, 18 );
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module.set_num_channels( num_channels );
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for( idx = 0; idx < num_channels; idx++ ) {
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module.set_initial_panning( idx, 128 );
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}
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module.set_sequence_length( sequence_length );
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for( idx = 0; idx < sequence_length; idx++ ) {
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module.set_sequence( idx, song_header[ 20 + idx ] & 0xFF );
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}
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module.set_num_patterns( num_patterns );
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for( idx = 0; idx < num_patterns; idx++ ) {
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module.set_pattern( idx, read_xm_pattern( data_input, num_channels ) );
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}
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module.set_num_instruments( num_instruments );
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for( idx = 1; idx <= num_instruments; idx++ ) {
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try {
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instrument = read_xm_instrument( data_input, delta_env );
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module.set_instrument( idx, instrument );
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} catch( EOFException e ) {
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System.out.println( "Instrument " + idx + " is missing!" );
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}
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}
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return module;
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}
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private static Pattern read_xm_pattern( DataInput data_input, int num_channels ) throws IOException {
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int pattern_header_length, packing_type, num_rows, pattern_data_length;
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byte[] structure_header, pattern_header, pattern_data;
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Pattern pattern;
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structure_header = new byte[ 4 ];
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data_input.readFully( structure_header );
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pattern_header_length = int_le( structure_header, 0 );
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pattern_header = new byte[ pattern_header_length ];
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data_input.readFully( pattern_header, 4, pattern_header_length - 4 );
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packing_type = pattern_header[ 4 ];
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if( packing_type != 0 ) {
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throw new IllegalArgumentException( "Pattern packing type " + packing_type + " is not supported!" );
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}
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pattern = new Pattern();
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pattern.num_rows = unsigned_short_le( pattern_header, 5 );
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pattern_data_length = unsigned_short_le( pattern_header, 7 );
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pattern_data = new byte[ pattern_data_length ];
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data_input.readFully( pattern_data );
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pattern.set_pattern_data( pattern_data );
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return pattern;
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}
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private static Instrument read_xm_instrument( DataInput data_input, boolean delta_env ) throws IOException {
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int instrument_header_length, num_samples, idx;
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int env_tick, env_ampl, env_num_points, flags;
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byte[] structure_header, instrument_header, sample_headers;
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Instrument instrument;
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Envelope envelope;
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structure_header = new byte[ 4 ];
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data_input.readFully( structure_header );
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instrument_header_length = int_le( structure_header, 0 );
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instrument_header = new byte[ instrument_header_length ];
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data_input.readFully( instrument_header, 4, instrument_header_length - 4 );
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instrument = new Instrument();
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instrument.name = ascii_text( instrument_header, 4, 22 );
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num_samples = unsigned_short_le( instrument_header, 27 );
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if( num_samples > 0 ) {
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instrument.set_num_samples( num_samples );
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for( idx = 0; idx < 96; idx++ ) {
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instrument.set_key_to_sample( idx + 1, instrument_header[ 33 + idx ] & 0xFF );
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}
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envelope = new Envelope();
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env_num_points = instrument_header[ 225 ] & 0xFF;
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envelope.set_num_points( env_num_points );
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for( idx = 0; idx < env_num_points; idx++ ) {
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env_tick = unsigned_short_le( instrument_header, 129 + idx * 4 );
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env_ampl = unsigned_short_le( instrument_header, 131 + idx * 4 );
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envelope.set_point( idx, env_tick, env_ampl, delta_env );
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}
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envelope.set_sustain_point( instrument_header[ 227 ] & 0xFF );
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envelope.set_loop_points( instrument_header[ 228 ] & 0xFF, instrument_header[ 229 ] & 0xFF );
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flags = instrument_header[ 233 ] & 0xFF;
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instrument.volume_envelope_active = ( flags & 0x1 ) == 0x1;
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envelope.sustain = ( flags & 0x2 ) == 0x2;
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envelope.looped = ( flags & 0x4 ) == 0x4;
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instrument.set_volume_envelope( envelope );
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envelope = new Envelope();
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env_num_points = instrument_header[ 226 ] & 0xFF;
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envelope.set_num_points( env_num_points );
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for( idx = 0; idx < env_num_points; idx++ ) {
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env_tick = unsigned_short_le( instrument_header, 177 + idx * 4 );
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env_ampl = unsigned_short_le( instrument_header, 179 + idx * 4 );
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envelope.set_point( idx, env_tick, env_ampl, delta_env );
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}
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envelope.set_sustain_point( instrument_header[ 230 ] & 0xFF );
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envelope.set_loop_points( instrument_header[ 231 ] & 0xFF, instrument_header[ 232 ] & 0xFF );
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flags = instrument_header[ 234 ] & 0xFF;
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instrument.panning_envelope_active = ( flags & 0x1 ) == 0x1;
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envelope.sustain = ( flags & 0x2 ) == 0x2;
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envelope.looped = ( flags & 0x4 ) == 0x4;
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instrument.set_panning_envelope( envelope );
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instrument.vibrato_type = instrument_header[ 235 ] & 0xFF;
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instrument.vibrato_sweep = instrument_header[ 236 ] & 0xFF;
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instrument.vibrato_depth = instrument_header[ 237 ] & 0xFF;
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instrument.vibrato_rate = instrument_header[ 238 ] & 0xFF;
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instrument.volume_fade_out = unsigned_short_le( instrument_header, 239 );
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sample_headers = new byte[ num_samples * 40 ];
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data_input.readFully( sample_headers );
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for( idx = 0; idx < num_samples; idx++ ) {
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instrument.set_sample( idx, read_xm_sample( sample_headers, idx, data_input ) );
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}
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}
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return instrument;
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}
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private static Sample read_xm_sample( byte[] sample_headers, int sample_idx, DataInput data_input ) throws IOException {
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int header_offset, sample_length, loop_start, loop_length;
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int flags, in_idx, out_idx, sam, last_sam;
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int fine_tune, relative_note;
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boolean sixteen_bit, ping_pong;
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byte[] raw_sample_data;
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short[] decoded_sample_data;
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Sample sample;
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header_offset = sample_idx * 40;
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sample = new Sample();
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sample_length = int_le( sample_headers, header_offset );
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loop_start = int_le( sample_headers, header_offset + 4 );
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loop_length = int_le( sample_headers, header_offset + 8 );
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sample.volume = sample_headers[ header_offset + 12 ] & 0xFF;
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fine_tune = sample_headers[ header_offset + 13 ];
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fine_tune = ( fine_tune << IBXM.FP_SHIFT ) / 1536;
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sample.set_panning = true;
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flags = sample_headers[ header_offset + 14 ] & 0xFF;
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if( ( flags & 0x03 ) == 0 ) {
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loop_length = 0;
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}
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ping_pong = ( flags & 0x02 ) == 0x02;
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sixteen_bit = ( flags & 0x10 ) == 0x10;
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sample.panning = sample_headers[ header_offset + 15 ] & 0xFF;
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relative_note = sample_headers[ header_offset + 16 ];
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relative_note = ( relative_note << IBXM.FP_SHIFT ) / 12;
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sample.transpose = relative_note + fine_tune;
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sample.name = ascii_text( sample_headers, header_offset + 18, 22 );
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raw_sample_data = new byte[ sample_length ];
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try {
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data_input.readFully( raw_sample_data );
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} catch( EOFException e ) {
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System.out.println( "Sample has been truncated!" );
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}
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in_idx = 0;
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out_idx = 0;
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sam = 0;
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last_sam = 0;
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if( sixteen_bit ) {
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decoded_sample_data = new short[ sample_length >> 1 ];
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while( in_idx < raw_sample_data.length ) {
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sam = raw_sample_data[ in_idx ] & 0xFF;
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sam = sam | ( ( raw_sample_data[ in_idx + 1 ] & 0xFF ) << 8 );
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last_sam = last_sam + sam;
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decoded_sample_data[ out_idx ] = ( short ) last_sam;
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in_idx += 2;
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out_idx += 1;
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}
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sample.set_sample_data( decoded_sample_data, loop_start >> 1, loop_length >> 1, ping_pong );
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} else {
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decoded_sample_data = new short[ sample_length ];
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while( in_idx < raw_sample_data.length ) {
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sam = raw_sample_data[ in_idx ] & 0xFF;
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last_sam = last_sam + sam;
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decoded_sample_data[ out_idx ] = ( short ) ( last_sam << 8 );
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in_idx += 1;
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out_idx += 1;
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}
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sample.set_sample_data( decoded_sample_data, loop_start, loop_length, ping_pong );
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}
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return sample;
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}
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private static int unsigned_short_le( byte[] buffer, int offset ) {
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int value;
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value = buffer[ offset ] & 0xFF;
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value = value | ( ( buffer[ offset + 1 ] & 0xFF ) << 8 );
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return value;
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}
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private static int int_le( byte[] buffer, int offset ) {
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int value;
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value = buffer[ offset ] & 0xFF;
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value = value | ( ( buffer[ offset + 1 ] & 0xFF ) << 8 );
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value = value | ( ( buffer[ offset + 2 ] & 0xFF ) << 16 );
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value = value | ( ( buffer[ offset + 3 ] & 0x7F ) << 24 );
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return value;
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}
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private static String ascii_text( byte[] buffer, int offset, int length ) {
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int idx, chr;
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byte[] string_buffer;
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String string;
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string_buffer = new byte[ length ];
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for( idx = 0; idx < length; idx++ ) {
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chr = buffer[ offset + idx ];
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if( chr < 32 ) {
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chr = 32;
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}
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string_buffer[ idx ] = ( byte ) chr;
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}
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try {
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string = new String( string_buffer, 0, length, "ISO-8859-1" );
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} catch( UnsupportedEncodingException e ) {
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string = "";
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}
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return string;
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}
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}
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