public void Play()
{
var mStrm = new MemoryStream();
BinaryWriter writer = new BinaryWriter(mStrm);
int msDuration = GetDuration() * 60;
int formatChunkSize = 16;
int headerSize = 8;
short formatType = 1;
short tracks = 1;
int samplesPerSecond = 44100;
short bitsPerSample = 16;
short frameSize = (short)(tracks * ((bitsPerSample + 7) / 8));
int bytesPerSecond = samplesPerSecond * frameSize;
int waveSize = 4;
int samples = (int)((decimal)samplesPerSecond * msDuration / 1000);
int dataChunkSize = samples * frameSize;
int fileSize = waveSize + headerSize + formatChunkSize + headerSize + dataChunkSize;
{
// var encoding = new System.Text.UTF8Encoding();
writer.Write(0x46464952); // = encoding.GetBytes("RIFF")
writer.Write(fileSize);
writer.Write(0x45564157); // = encoding.GetBytes("WAVE")
writer.Write(0x20746D66); // = encoding.GetBytes("fmt ")
writer.Write(formatChunkSize);
writer.Write(formatType);
writer.Write(tracks);
writer.Write(samplesPerSecond);
writer.Write(bytesPerSecond);
writer.Write(frameSize);
writer.Write(bitsPerSample);
writer.Write(0x61746164); // = encoding.GetBytes("data")
writer.Write(dataChunkSize);
}
foreach (Measure measure in mMeasures)
{
for (int c = 0; c < measure.GetChordCount(); c++)
{
Chord chord = measure.GetChord(c);
if (chord.GetNote(0).GetPitch() != Pitch.Rest)
{
double[] angles = new double[chord.GetNoteCount()];
ushort[] frequency = new ushort[chord.GetNoteCount()];
int[] samplesPerWavelength = new int[chord.GetNoteCount()];
short[] ampSteps = new short[chord.GetNoteCount()];
int chordSamples = (int)((decimal)samplesPerSecond * (int)chord.GetDuration() * 60 / 1000);
ushort volume = 16383;
if (chord.GetWaveForm() == WaveForm.Square)
{
volume /= 2;
}
const double TAU = 2 * Math.PI;
double NOTE_CONSTANT = Math.Pow(2, (1.0 / 12.0));
double amp = volume / 2;
for (int i = 0; i < chord.GetNoteCount(); i++)
{
double step = (int)Pitch.A;
if (chord.GetNote(i).GetPitch() < Pitch.E)
{
step -= 0.5;
}
step += (chord.GetNote(i).Octave - 4) * 6;
double exp = -2 * ((double)chord.GetNote(i).GetPitch() - step);
frequency[i] = (ushort)(440 * Math.Pow(NOTE_CONSTANT, exp));
samplesPerWavelength[i] = bytesPerSecond / frequency[i];
ampSteps[i] = (short)(amp * 2 / samplesPerWavelength[i]);
}
for (int i = 0; i < angles.Length; i++)
{
angles[i] = frequency[i] * TAU / samplesPerSecond;
}
short tempSample = (short)-amp;
for (int i = 0; i < chordSamples; i++)
{
short s = 0;
switch (chord.GetWaveForm())
{
case WaveForm.Sine:
foreach (double theta in angles)
{
s += (short)(amp * Math.Sin(theta * i));
}
break;
case WaveForm.Square:
foreach (double theta in angles)
{
s += (short)(amp * Math.Sign(Math.Sin(theta * i)));
}
break;
case WaveForm.Sawtooth:
foreach (short ampStep in ampSteps)
{
tempSample += ampStep;
s += (short)(tempSample / ampSteps.Length);
}
break;
case WaveForm.Triangle:
for (int j = 0; j < ampSteps.Length; j++)
{
if (Math.Abs(tempSample) > amp)
{
ampSteps[j] = (short)-ampSteps[j];
}
tempSample += ampSteps[j];
s += (short)(tempSample / ampSteps.Length);
}
break;
case WaveForm.Noise:
s += (short)((new Random().NextDouble() * 2 - 1) * amp);
break;
}
writer.Write(s);
}
}
}
}
mStrm.Seek(0, SeekOrigin.Begin);
new System.Media.SoundPlayer(mStrm).Play();
writer.Close();
mStrm.Close();
}
public void ExportAudio(string filename)
{
BinaryWriter writer = new BinaryWriter(File.Open(filename, FileMode.Create));
Random RG = new Random();
int msDuration = GetDuration() * 3600 / BPM;
int formatChunkSize = 16;
int headerSize = 8;
short formatType = 1;
short tracks = 1;
int samplesPerSecond = 44100;
short bitsPerSample = 16;
short frameSize = (short)(tracks * ((bitsPerSample + 7) / 8));
int bytesPerSecond = samplesPerSecond * frameSize;
int waveSize = 4;
int samples = (int)((decimal)samplesPerSecond * msDuration / 1000);
int dataChunkSize = samples * frameSize;
int fileSize = waveSize + headerSize + formatChunkSize + headerSize + dataChunkSize;
{
// var encoding = new System.Text.UTF8Encoding();
writer.Write(0x46464952); // = encoding.GetBytes("RIFF")
writer.Write(fileSize);
writer.Write(0x45564157); // = encoding.GetBytes("WAVE")
writer.Write(0x20746D66); // = encoding.GetBytes("fmt ")
writer.Write(formatChunkSize);
writer.Write(formatType);
writer.Write(tracks);
writer.Write(samplesPerSecond);
writer.Write(bytesPerSecond);
writer.Write(frameSize);
writer.Write(bitsPerSample);
writer.Write(0x61746164); // = encoding.GetBytes("data")
writer.Write(dataChunkSize);
}
for (int sz = 0; sz < stanzas; sz++)
{
short[] preSamples = new short[samples];
for (int inst = GetInstrumentCount() * sz / stanzas; inst < GetInstrumentCount() * (sz + 1) / stanzas; inst++)
{
Instrument instrument = GetInstrument(inst);
for (int st = 0; st < instrument.GetStaffCount(); st++)
{
int chordNumber = 0;
Staff staff = instrument.GetStaff(st);
for (int m = 0; m < staff.GetMeasureCount(); m++)
{
Measure measure = staff.GetMeasure(m);
for (int c = 0; c < measure.GetChordCount(); c++)
{
Chord chord = measure.GetChord(c);
double[] angles = new double[chord.GetNoteCount()];
ushort[] frequency = new ushort[chord.GetNoteCount()];
int[] samplesPerWavelength = new int[chord.GetNoteCount()];
short[] ampSteps = new short[chord.GetNoteCount()];
int chordSamples = (int)((decimal)samplesPerSecond * (int)chord.GetDuration() * 3600 / BPM / 1000);
ushort volume = 16383;
if (chord.GetWaveForm() == WaveForm.Square)
{
volume /= 2;
}
const double TAU = 2 * Math.PI;
double NOTE_CONSTANT = Math.Pow(2, (1.0 / 12.0));
double amp = volume / 2;
for (int n = 0; n < chord.GetNoteCount(); n++)
{
double step = (int)Pitch.A;
if (chord.GetNote(n).GetPitch() < Pitch.E)
{
step -= 0.5;
}
step += (chord.GetNote(n).Octave - 4) * 6;
double exp = -2 * ((double)chord.GetNote(n).GetPitch() - step);
frequency[n] = (ushort)(440 * Math.Pow(NOTE_CONSTANT, exp));
samplesPerWavelength[n] = bytesPerSecond / frequency[n];
ampSteps[n] = (short)(amp * 2 / samplesPerWavelength[n]);
}
for (int n = 0; n < chord.GetNoteCount(); n++)
{
angles[n] = frequency[n] * TAU / samplesPerSecond;
}
short tempSample = (short)-amp;
for (int s = 0; s < chordSamples; s++)
{
short sample = 0;
if (chord.GetNote(0).GetPitch() != Pitch.Rest)
{
switch (chord.GetWaveForm())
{
case WaveForm.Sine:
for (int n = 0; n < chord.GetNoteCount(); n++)
{
sample += (short)(amp * Math.Sin(angles[n] * s));
}
break;
case WaveForm.Square:
for (int n = 0; n < chord.GetNoteCount(); n++)
{
sample += (short)(amp * Math.Sign(Math.Sin(angles[n] * s)));
}
break;
case WaveForm.Sawtooth:
for (int n = 0; n < chord.GetNoteCount(); n++)
{
sample += (short)(s % samplesPerWavelength[n] * ampSteps[n]);
}
break;
case WaveForm.Triangle:
for (int n = 0; n < chord.GetNoteCount(); n++)
{
int sLoc = s % samplesPerWavelength[n];
if (sLoc < samplesPerWavelength[n] / 2)
{
if (sLoc < samplesPerWavelength[n] / 4)
{
sample += (short)(sLoc * ampSteps[n]);
}
else
{
sample += (short)((samplesPerWavelength[n] - sLoc) * ampSteps[n]);
}
}
else
if (sLoc < samplesPerWavelength[n] * 3 / 4)
{
sample += (short)(sLoc * ampSteps[n]);
}
else
{
sample += (short)((samplesPerWavelength[n] - sLoc) * ampSteps[n]);
}
}
break;
case WaveForm.Noise:
sample += (short)RG.Next((int)-amp, (int)amp);
break;
}
}
preSamples[chordNumber] += sample;
chordNumber++;
}
}
}
}
}
foreach (short s in preSamples)
{
writer.Write(s);
}
}
writer.Close();
}