public static MIDIData readFile(string filePath)
{
MIDIData data = new MIDIData();
try
{
Console.WriteLine("Reading file {0}", filePath);
byte[] fileBytes = File.ReadAllBytes(filePath);
UInt64 trackChunkStart = MIDIFileReader.readHeader(fileBytes, data);
Console.WriteLine("format: {0}, ntracks: {1}, tickdiv: {2} ", data.format, data.ntracks, data.tickdiv);
if (data.timing == TimingScheme.MetricalTiming)
{
Console.WriteLine("Metrical timing PPQN: {0}", data.metrical_ppqn);
}
else
{
Console.WriteLine("Timecode FPS: {0} SFR:{1}", data.timecode_fps, data.timecode_sfr);
}
UInt64 trackChunkEnd = trackChunkStart;
while (trackChunkEnd < (UInt64)fileBytes.Length && data.tracks.Count < data.ntracks)
{
trackChunkEnd = MIDIFileReader.readTracks(fileBytes, data, trackChunkEnd);
Console.WriteLine("Track {0} read with {1} events", data.tracks.Count, data.tracks[data.tracks.Count - 1].events.Count);
}
}
catch (Exception e)
{
Console.WriteLine("Failed to read file {0}: {1}\n{2}", filePath, e.Message, e.StackTrace);
}
return(data);
}
// returns length of header
static UInt64 readHeader(byte[] fileData, MIDIData data)
{
ushort expectedChunkLen = 6;
if (fileData.Length < 8)
{
throw new Exception("File data too short to contain header");
}
if (!(fileData[0] == 0x4d && fileData[1] == 0x54 && fileData[2] == 0x68 && fileData[3] == 0x64)) // "MThd"
{
throw new Exception("File data does not contain header identifier");
}
ushort chunklen = 0;
chunklen |= (ushort)((ushort)fileData[4] << 24);
chunklen |= (ushort)((ushort)fileData[5] << 16);
chunklen |= (ushort)((ushort)fileData[6] << 8);
chunklen |= (ushort)((ushort)fileData[7]);
Console.WriteLine("Chunk length: {0}", chunklen);
if (fileData.Length < 8 + chunklen)
{
throw new Exception("File data too short to contain header chunk");
}
if (chunklen != expectedChunkLen)
{
throw new Exception("Unexpected chunk length in header (was " + chunklen + " expected " + expectedChunkLen + ")");
}
data.format = (ushort)((ushort)fileData[8] << 8 | (ushort)fileData[9]);
if (data.format > 2)
{
throw new Exception("Undefined format value in header (" + data.format + ")");
}
data.ntracks = (ushort)((ushort)fileData[10] << 8 | (ushort)fileData[11]);
data.tickdiv = (ushort)((ushort)fileData[12] << 8 | (ushort)fileData[13]);
if (((data.tickdiv >> 15) & 0x01) == 1)
{
data.timing = TimingScheme.TimeCode;
data.timecode_fps = (ushort)((data.tickdiv >> 8) & 0x7);
data.timecode_sfr = (ushort)(data.tickdiv & 0xf);
}
else
{
data.timing = TimingScheme.MetricalTiming;
data.metrical_ppqn = (ushort)(data.tickdiv & 0x7f);
}
return((UInt64)(chunklen + 8));
}
static UInt64 readTracks(byte[] fileData, MIDIData data, UInt64 chunkStart)
{
UInt64 index = chunkStart;
while (index < (UInt64)fileData.Length)
{
// start reading a track chunk
if ((UInt64)fileData.Length < index + 8)
{
throw new Exception("File data too short to contain track chunk at index " + index);
}
if (!(fileData[index + 0] == 0x4d && fileData[index + 1] == 0x54 && fileData[index + 2] == 0x72 && fileData[index + 3] == 0x6B)) // "MTrk"
{
throw new Exception("File data does not contain expected track identifier at index " + index);
}
index += 4;
ushort chunklen = 0;
chunklen |= (ushort)((ushort)fileData[index + 0] << 24);
chunklen |= (ushort)((ushort)fileData[index + 1] << 16);
chunklen |= (ushort)((ushort)fileData[index + 2] << 8);
chunklen |= (ushort)((ushort)fileData[index + 3]);
index += 4;
Console.WriteLine("Chunklen {0}", chunklen);
if ((UInt64)fileData.Length < index + chunklen)
{
throw new Exception("File data too short to contain track chunk of length " + chunklen + " at index " + (index - 8));
}
MIDITrack track = new MIDITrack();
UInt64 trackindex = index;
MIDIEvent previous = new MIDIEvent();
while (trackindex < index + chunklen)
{
MIDIEvent new_event = MIDIFileReader.readEvent(fileData, ref trackindex, previous);
previous = new_event;
track.events.Add(new_event);
}
data.tracks.Add(track);
index = trackindex;
break;
}
return(index);
}
static void Main(string[] args)
{
WaveFormat waveFormat = new WaveFormat(44100, 16, 1);
Oscillator freqOsc = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, new ConstantScalar(0.1f), new ConstantScalar(80.0f), new ConstantScalar(0), new ConstantScalar(100.0f));
Oscillator ampOscVel = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, new ConstantScalar(0.05f), new ConstantScalar(8.0f), new ConstantScalar(0.5f), new ConstantScalar(8.0f));
Oscillator ampOsc = new Oscillator(Oscillator.WaveType.SawtoothWave, waveFormat.SampleRate, ampOscVel, new ConstantScalar(0.5f), new ConstantScalar(0), new ConstantScalar(1.1f));
Oscillator variableFreq = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, freqOsc, ampOsc, new ConstantScalar(0), new ConstantScalar(0));
ScalarPassthrough scalarPassthru = new ScalarPassthrough(waveFormat, variableFreq);
NoiseGenerator noiseGen = new NoiseGenerator(waveFormat, NoiseGenerator.NoiseType.WhiteNoise);
Oscillator freqsweep = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, new ConstantScalar(0.1f), new ConstantScalar(200), new ConstantScalar(0), new ConstantScalar(440));
Oscillator qsweep = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, new ConstantScalar(1.0f), new ConstantScalar(0.9f), new ConstantScalar(0), new ConstantScalar(1.0f)); //new ConstantScalar((float)(1.0 / Math.Sqrt(2)));
//Oscillator gainSweep = new Oscillator(Oscillator.WaveType.TriangleWave, waveFormat.SampleRate, new ConstantScalar(0.025f), new ConstantScalar(2), new ConstantScalar(0), new ConstantScalar(6));
ConstantScalar gainSweep = new ConstantScalar(6);
SampleProcessor.SampleProcessor filter = new SampleProcessor.NotchFilter(waveFormat, freqsweep, qsweep, gainSweep, scalarPassthru);
// distortion "pedal" on a minimally modified hard body electric guitar signal
Oscillator gainOsc = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, new ConstantScalar(0.5f), new ConstantScalar(2), new ConstantScalar(0), new ConstantScalar(5));
Oscillator cutoffOsc = new Oscillator(Oscillator.WaveType.SineWave, waveFormat.SampleRate, new ConstantScalar(0.95f), new ConstantScalar(3), new ConstantScalar(0), new ConstantScalar(4));
ConstantScalar cutoff = new ConstantScalar(0.2f);
IWaveSource cleanguitar = CodecFactory.Instance.GetCodec(@"..\..\sampledata\guitar-sample.mp3"); // sample signal from single-pickup electric guitar. Recorded 8/14/20.
IReadableAudioSource <float> convertedguitar = cleanguitar.ToMono().ToSampleSource();
SampleProcessor.DistortionEffect distortion = new SampleProcessor.DistortionEffect(waveFormat, gainOsc, cutoff, convertedguitar);
SampleProcessor.SampleProcessor reverbEffect = new SampleProcessor.ReverbEffect(waveFormat, new ConstantScalar(0.4f), new ConstantScalar(0.5f), waveFormat.SampleRate, distortion);
BasicAudioController basicAudioController = new BasicAudioController(GetSoundOut(), 1, 44100);
basicAudioController.addSource((ISampleSource)reverbEffect);
basicAudioController.startPlaying();
Console.ReadKey();
basicAudioController.stopPlaying();
return;
MIDI.MIDIData data = MIDI.MIDIFileReader.readFile(@"..\..\sampledata\MIDI_sample.mid");
MIDI.MIDIData testdata = new MIDI.MIDIData();
testdata.format = 0;
testdata.timing = MIDI.TimingScheme.TimeCode;
testdata.timecode_fps = 24;
testdata.timecode_sfr = 4;
testdata.ntracks = 1;
testdata.tracks.Add(new MIDI.MIDITrack());
MIDI.MIDIEvent event0 = new MIDI.MIDIEvent();
MIDI.MIDIEvent event1 = new MIDI.MIDIEvent();
event0.delta = 4 * 24 * 5; // wait 5 seconds from start
event1.delta = 4 * 24 * 2; // 2 seconds
//event0.type = MIDI.EventType.MIDIEvent;
//event0.midieventtype = MIDI.MIDIEventType.NoteOn;
//event0.val1 = 0; // channel 0
//event0.val2 = 60; // middle C
//event0.val3 = 1;
//event1.type = MIDI.EventType.MIDIEvent;
//event1.midieventtype = MIDI.MIDIEventType.NoteOff;
//event1.val1 = 0; // channel 0
//event1.val2 = 60; // middle C
//event1.val3 = 1;
//testdata.tracks[0].events.Add(event0);
//testdata.tracks[0].events.Add(event1);
MIDI.MIDIPlayer player = new MIDI.MIDIPlayer(data);
Console.WriteLine("Track 1 events:");
player.playTrack(1);
Console.ReadKey();
return;
MIDIAudioController audioController = new MIDIAudioController(GetSoundOut());
ChromaticScale.ChromaticScale scale = new ChromaticScale.ChromaticScale();
audioController.startPlaying();
SampleSource.WaveGenerator.WaveType wavetype = WaveGenerator.WaveType.SineWave;
Console.ReadKey(); // wait for input
for (int i = 0; i < scale.notes.Count(); i++)
{
float freq = scale.notes[i].base_freq / 2;
Console.WriteLine(scale.notes[i].identifier[0] + " - " + freq + " - " + wavetype);
audioController.updatePlaying(freq, wavetype);
Console.ReadKey(); // wait for input
wavetype = Next(wavetype);
}
for (int i = 0; i < scale.notes.Count(); i++)
{
Console.WriteLine(scale.notes[i].identifier[0] + " - " + scale.notes[i].base_freq.ToString() + " - " + wavetype);
audioController.updatePlaying(scale.notes[i].base_freq, wavetype);
Console.ReadKey(); // wait for input
wavetype = Next(wavetype);
}
for (int i = 0; i < scale.notes.Count(); i++)
{
float freq = scale.notes[i].base_freq * 2;
Console.WriteLine(scale.notes[i].identifier[0] + " - " + freq + " - " + wavetype);
audioController.updatePlaying(freq, wavetype);
Console.ReadKey(); // wait for input
wavetype = Next(wavetype);
}
audioController.stopPlaying();
audioController.Dispose();
}
public MIDIPlayer(MIDIData data)
{
this.data = data;
}