chaojian-zhang
commented
8 months ago By the way, as to the first part of my description above - "sound difference between VLC and Melty Synth", I was using NAudio for play back and testing Clickteam - Klik & Play - Romeo - Medieval Tune (Greensleeves).mid that comes with arachno-soundfont-1.0 inside the "MIDI Files" folder. You can reproduce and hear it using code below (I am using NAudio for playback):
byte[] ConvertChannels(float[] left, float[] right)
{
var bytes = left
.Zip(right, (left, right) => (Left: left, Right: right))
.SelectMany(channels => {
// This automatically handles both negative and positive spectrum
// because channels value could be negative
var sampleL = (short)(channels.Left * short.MaxValue);
var sampleR = (short)(channels.Right * short.MaxValue);
var bytesL = BitConverter.GetBytes(sampleL);
var bytesR = BitConverter.GetBytes(sampleR);
// Each sample is just byte sequence of a short
// Samples for each channel follows each other
return new byte[] {
bytesL[0], bytesL[1],
bytesR[0], bytesR[1]
};
})
.ToArray();
return bytes;
}
WaveOutEvent Play(int sampleRate, float[] left, float[] right)
{
var bytes = ConvertChannels(left, right);
var memoryStream = new MemoryStream(bytes);
var waveStream = new RawSourceWaveStream(memoryStream, new WaveFormat(sampleRate, 16, 2));
var outputDevice = new WaveOutEvent();
outputDevice.Init(waveStream);
outputDevice.Play();
return outputDevice;
}var sampleRate = 44100;
var synthesizer = new Synthesizer(soundFontFilePath, sampleRate);
var midiFile = new MidiFile(@"Clickteam - Klik & Play - Romeo - Medieval Tune (Greensleeves).mid");
var sequencer = new MidiFileSequencer(synthesizer);
sequencer.Play(midiFile, false);
var left = new float[(int)(sampleRate * midiFile.Length.TotalSeconds)];
var right = new float[(int)(sampleRate * midiFile.Length.TotalSeconds)];
sequencer.Render(left, right);
var waveOutEvent = Play(sampleRate, left);
sinshu
Hi, thanks a lot for this amazing library! It's awesome👍, and I've used it in my personal project here (Fluent Synth)😆. In general it is very straightforward and works great out of the box, but I do notice a difference in playback compared to VLC's FluidSynth. At the moment I am still looking into whether it has to do with my setup or it's just the two platforms interpret MIDI files different.
Anyway, my question here is related to Arachno SoundFont - Version 1.0: in the documentation of this sound font it mentioned there are some "drum kits" available:
I wonder how we can use those drum kits through Melty Synth? (In the documentation it mentioned General MIDI has Music Box or instrument number 10 used as default for drum kit, but not further information on that) If you have any information on how those drum kits are defined inside a MIDI file that would also be very helpful!