private void readGeneralInfo(BufferedInputStream in, Module module) throws IOException {
// "Extended Module: "
byte b[] = read(in, 17);
if (!(new String(b)).equalsIgnoreCase("Extended Module: ")) {
throw new IOException("This is not a xm file!");
}
// Module name
b = read(in, 20);
module.setTitle(new String(b));
in.read();
// Tracker name
b = read(in, 20);
// version
in.read();
in.read();
// Header size
read(in, 4);
// Song length (in pattern order table)
int[] patorder = new int[make16Bit(read(in, 2))];
// Restart position
module.setRestartPosition(make16Bit(read(in, 2)));
// Number of channels (2,4,6,8,10,...,32)
module.setChannelCount(make16Bit(read(in, 2)));
// Number of patterns (max 128)
module.setPatterns(new Pattern[make16Bit(read(in, 2))]);
// Number of instruments (max 128)
module.setInstruments(new Instrument[make16Bit(read(in, 2))]);
// Flags: bit 0: 0 = Amiga frequency table;
// 1 = Linear frequency table
if ((make16Bit(read(in, 2)) & 0x1) == 0) module.setAmigaFreqTable(true);
// Default tempo
module.setTempo(make16Bit(read(in, 2)));
// Default BPM
module.setBpm(make16Bit(read(in, 2)));
// Pattern order table
b = read(in, 256);
for (int i = 0; i < patorder.length; i++) {
patorder[i] = b[i];
}
module.setPatternOrder(patorder);
}
private void readPattern(BufferedInputStream in, Pattern p) throws IOException {
// Pattern header length
read(in, 4);
// Packing type (always 0)
in.read();
// Number of rows in pattern (1...256)
int rows = make16Bit(read(in, 2));
// Packed patterndata size
int size = make16Bit(read(in, 2));
int data[];
if (size == 0) {
data = new int[0];
} else {
byte[] b = read(in, size);
data = new int[size];
for (int i = 0; i < size; i++) {
data[i] = b[i];
}
}
p.setData(data);
p.setRows(rows);
}
/**
* Load the file into memory
*
* @param is The InputStream to read the file from
*/
public void load(BufferedInputStream in, Module module) throws IOException {
readGeneralInfo(in, module);
Pattern[] pattern = module.getPatterns();
for (int i = 0; i < pattern.length; i++) {
pattern[i] = new Pattern();
readPattern(in, pattern[i]);
}
Instrument[] instrument = module.getInstruments();
for (int i = 0; i < instrument.length; i++) {
instrument[i] = new Instrument();
readInstrument(in, instrument[i]);
}
in.close();
}
private void loadSample(BufferedInputStream in, Sample sample) throws IOException {
// Sample length
int sampleLength = make32Bit(read(in, 4));
// Sample loop start
int loopStart = make32Bit(read(in, 4));
// Sample loop length
int loopEnd = make32Bit(read(in, 4));
if (loopStart + loopEnd > sampleLength) loopEnd = (sampleLength) - loopStart;
// Volume
sample.setVolume(in.read());
// Finetune (signend byte -128...+127)
sample.setFineTune((byte) in.read());
// Type: Bit 0-1: 0 = No loop,
// 1 = Forward loop,
// 2 = Ping-pong loop;
// 4: 16-bit sampledata
int loopType = in.read();
int sampleQuality = ((int) loopType & 0x10) != 0 ? 16 : 8;
if ((loopType & 0x3) == 0 || loopEnd == 0) {
// no looping
loopStart = 0;
loopEnd = sampleLength;
loopType &= 0x10;
}
// Panning (0-255)
sample.setPanning(in.read() & 0xff);
// Relative note number (signed byte)
sample.setRelativeNote((byte) in.read());
// Reserved
in.read();
// Sample name
read(in, 22);
sample.setLength(sampleLength);
sample.setLoopType(loopType);
sample.setQuality(sampleQuality);
sample.setLoopStart(loopStart);
sample.setLoopEnd(loopEnd);
}
public void readInstrument(BufferedInputStream in, Instrument instr) throws IOException {
// Instrument size
int size = make32Bit(read(in, 4));
// Instrument name
read(in, 22);
// Instrument type (always 0)
// Note: not always 0 but it says so in the documents...
in.read();
// Number of samples in instrument
Sample[] sample = new Sample[make16Bit(read(in, 2))];
if (sample.length == 0) {
read(in, size - 29);
} else {
// Sample header size
int ssize = make32Bit(read(in, 4));
if (ssize != 40) {
throw new IOException("samplesize != 40!");
}
// Sample number for all notes
instr.setSampleForNote(read(in, 96));
// Points for volume envelope
byte[] volEnvData = read(in, 48);
// Points for panning envelope
byte[] panEnvData = read(in, 48);
// Number of volume points
int points = in.read();
Envelope volumeEnvelope = new Envelope();
volumeEnvelope.setData(makeEnvelopePoints(points, volEnvData));
// Number of panning points
points = in.read();
Envelope panningEnvelope = new Envelope();
panningEnvelope.setData(makeEnvelopePoints(points, panEnvData));
// Volume sustain point
volumeEnvelope.setSustainPosition(in.read());
// Volume loop start point
volumeEnvelope.setLoopStart(in.read());
// Volume loop end point
volumeEnvelope.setLoopEnd(in.read());
// Panning sustain point
panningEnvelope.setSustainPosition(in.read());
// Panning loop start point
panningEnvelope.setLoopStart(in.read());
// Panning loop end point
panningEnvelope.setLoopEnd(in.read());
// Volume type: bit 0: on; 1: Sustain; 2: Loop
volumeEnvelope.setType(in.read());
// Panning type: bit 0: on; 1: Sustain; 2: Loop
panningEnvelope.setType(in.read());
// Vibrato type
Vibrato vibrato = new Vibrato();
vibrato.setType(in.read());
// Vibrato sweep
vibrato.setSweep(in.read());
// Vibrato depth
vibrato.setDepth(in.read());
// Vibrato rate
vibrato.setRate(in.read());
// Volume fadeout
instr.setFadeout(make16Bit(read(in, 2)));
// reserved
read(in, 22);
for (int i = 0; i < sample.length; i++) {
sample[i] = new Sample();
loadSample(in, sample[i]);
}
for (int i = 0; i < sample.length; i++) {
loadSampleData(in, sample[i]);
}
instr.setPanningEnvelope(panningEnvelope);
instr.setVolumeEnvelope(volumeEnvelope);
instr.setVibrato(vibrato);
instr.setSamples(sample);
}
}
public static final byte[] read(BufferedInputStream in, int len) throws IOException {
byte[] b = new byte[len];
for (int i = 0; i < len; i += in.read(b, i, len - i)) ;
return b;
}