235 lines
7.6 KiB
Java
235 lines
7.6 KiB
Java
package ibxm;
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import java.io.*;
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public class ProTracker {
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public static boolean is_mod( byte[] header_1084_bytes ) {
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boolean is_mod;
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is_mod = false;
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if( calculate_num_channels( header_1084_bytes ) > 0 ) {
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is_mod = true;
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}
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return is_mod;
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}
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public static Module load_mod( byte[] header_1084_bytes, DataInput data_input ) throws IOException {
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int num_channels, channel_idx, panning;
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int sequence_length, restart_idx, sequence_idx;
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int num_patterns, pattern_idx, instrument_idx;
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Module module;
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num_channels = calculate_num_channels( header_1084_bytes );
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if( num_channels < 1 ) {
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throw new IllegalArgumentException( "ProTracker: Unrecognised module format!" );
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}
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module = new Module();
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module.song_title = ascii_text( header_1084_bytes, 0, 20 );
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module.pal = ( num_channels == 4 );
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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 = 6;
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module.default_tempo = 125;
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module.set_num_channels( num_channels );
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for( channel_idx = 0; channel_idx < num_channels; channel_idx++ ) {
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panning = 64;
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if( ( channel_idx & 0x03 ) == 0x01 || ( channel_idx & 0x03 ) == 0x02 ) {
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panning = 192;
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}
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module.set_initial_panning( channel_idx, panning );
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}
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sequence_length = header_1084_bytes[ 950 ] & 0x7F;
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restart_idx = header_1084_bytes[ 951 ] & 0x7F;
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if( restart_idx >= sequence_length ) {
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restart_idx = 0;
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}
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module.restart_sequence_index = restart_idx;
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module.set_sequence_length( sequence_length );
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for( sequence_idx = 0; sequence_idx < sequence_length; sequence_idx++ ) {
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module.set_sequence( sequence_idx, header_1084_bytes[ 952 + sequence_idx ] & 0x7F );
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}
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num_patterns = calculate_num_patterns( header_1084_bytes );
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module.set_num_patterns( num_patterns );
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for( pattern_idx = 0; pattern_idx < num_patterns; pattern_idx++ ) {
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module.set_pattern( pattern_idx, read_mod_pattern( data_input, num_channels ) );
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}
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module.set_num_instruments( 31 );
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for( instrument_idx = 1; instrument_idx <= 31; instrument_idx++ ) {
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module.set_instrument( instrument_idx, read_mod_instrument( header_1084_bytes, instrument_idx, data_input ) );
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}
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return module;
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}
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private static int calculate_num_patterns( byte[] module_header ) {
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int num_patterns, order_entry, pattern_idx;
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num_patterns = 0;
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for( pattern_idx = 0; pattern_idx < 128; pattern_idx++ ) {
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order_entry = module_header[ 952 + pattern_idx ] & 0x7F;
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if( order_entry >= num_patterns ) {
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num_patterns = order_entry + 1;
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}
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}
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return num_patterns;
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}
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private static int calculate_num_channels( byte[] module_header ) {
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int num_channels;
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switch( ( module_header[ 1082 ] << 8 ) | module_header[ 1083 ] ) {
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case 0x4b2e: /* M.K. */
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case 0x4b21: /* M!K! */
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case 0x542e: /* N.T. */
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case 0x5434: /* FLT4 */
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num_channels = 4;
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break;
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case 0x484e: /* xCHN */
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num_channels = module_header[ 1080 ] - 48;
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break;
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case 0x4348: /* xxCH */
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num_channels = ( ( module_header[ 1080 ] - 48 ) * 10 ) + ( module_header[ 1081 ] - 48 );
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break;
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default:
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/* Not recognised. */
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num_channels = 0;
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break;
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}
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return num_channels;
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}
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private static Pattern read_mod_pattern( DataInput data_input, int num_channels ) throws IOException {
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int input_idx, output_idx;
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int period, instrument, effect, effect_param;
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Pattern pattern;
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byte[] input_pattern_data, output_pattern_data;
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pattern = new Pattern();
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pattern.num_rows = 64;
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input_pattern_data = new byte[ 64 * num_channels * 4 ];
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output_pattern_data = new byte[ 64 * num_channels * 5 ];
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data_input.readFully( input_pattern_data );
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input_idx = 0;
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output_idx = 0;
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while( input_idx < input_pattern_data.length ) {
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period = ( input_pattern_data[ input_idx ] & 0x0F ) << 8;
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period = period | ( input_pattern_data[ input_idx + 1 ] & 0xFF );
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output_pattern_data[ output_idx ] = to_key( period );
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instrument = input_pattern_data[ input_idx ] & 0x10;
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instrument = instrument | ( ( input_pattern_data[ input_idx + 2 ] & 0xF0 ) >> 4 );
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output_pattern_data[ output_idx + 1 ] = ( byte ) instrument;
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effect = input_pattern_data[ input_idx + 2 ] & 0x0F;
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effect_param = input_pattern_data[ input_idx + 3 ] & 0xFF;
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if( effect == 0x01 && effect_param == 0 ) {
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/* Portamento up of zero has no effect. */
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effect = 0;
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}
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if( effect == 0x02 && effect_param == 0 ) {
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/* Portamento down of zero has no effect. */
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effect = 0;
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}
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if( effect == 0x08 && num_channels == 4 ) {
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/* Some Amiga mods use effect 0x08 for reasons other than panning.*/
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effect = 0;
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effect_param = 0;
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}
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if( effect == 0x0A && effect_param == 0 ) {
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/* Volume slide of zero has no effect.*/
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effect = 0;
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}
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if( effect == 0x05 && effect_param == 0 ) {
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/* Porta + Volume slide of zero has no effect.*/
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effect = 0x03;
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}
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if( effect == 0x06 && effect_param == 0 ) {
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/* Vibrato + Volume slide of zero has no effect.*/
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effect = 0x04;
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}
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output_pattern_data[ output_idx + 3 ] = ( byte ) effect;
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output_pattern_data[ output_idx + 4 ] = ( byte ) effect_param;
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input_idx += 4;
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output_idx += 5;
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}
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pattern.set_pattern_data( output_pattern_data );
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return pattern;
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}
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private static Instrument read_mod_instrument( byte[] mod_header, int idx, DataInput data_input ) throws IOException {
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int header_offset, sample_data_length;
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int loop_start, loop_length, sample_idx, fine_tune;
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Instrument instrument;
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Sample sample;
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byte[] raw_sample_data;
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short[] sample_data;
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header_offset = ( idx - 1 ) * 30 + 20;
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instrument = new Instrument();
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instrument.name = ascii_text( mod_header, header_offset, 22 );
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sample = new Sample();
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sample_data_length = unsigned_short_be( mod_header, header_offset + 22 ) << 1;
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fine_tune = mod_header[ header_offset + 24 ] & 0x0F;
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if( fine_tune > 7 ) {
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fine_tune -= 16;
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}
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sample.transpose = ( fine_tune << IBXM.FP_SHIFT ) / 96;
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sample.volume = mod_header[ header_offset + 25 ] & 0x7F;
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loop_start = unsigned_short_be( mod_header, header_offset + 26 ) << 1;
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loop_length = unsigned_short_be( mod_header, header_offset + 28 ) << 1;
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if( loop_length < 4 ) {
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loop_length = 0;
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}
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raw_sample_data = new byte[ sample_data_length ];
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sample_data = new short[ sample_data_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( "ProTracker: Instrument " + idx + " has samples missing." );
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}
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for( sample_idx = 0; sample_idx < raw_sample_data.length; sample_idx++ ) {
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sample_data[ sample_idx ] = ( short ) ( raw_sample_data[ sample_idx ] << 8 );
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}
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sample.set_sample_data( sample_data, loop_start, loop_length, false );
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instrument.set_num_samples( 1 );
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instrument.set_sample( 0, sample );
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return instrument;
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}
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private static byte to_key( int period ) {
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int oct, key;
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if( period < 32 ) {
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key = 0;
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} else {
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oct = LogTable.log_2( 7256 ) - LogTable.log_2( period );
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if( oct < 0 ) {
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key = 0;
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} else {
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key = oct * 12;
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key = key >> ( IBXM.FP_SHIFT - 1 );
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key = ( key >> 1 ) + ( key & 1 );
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}
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}
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return ( byte ) key;
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}
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private static int unsigned_short_be( byte[] buf, int offset ) {
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int value;
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value = ( buf[ offset ] & 0xFF ) << 8;
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value = value | ( buf[ offset + 1 ] & 0xFF );
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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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