internal Enumerator(VoiceCollection collection)
{
this.collection = collection;
index = 0;
current = null;
}
/// <summary>
/// Initializes a new synthesizer using a specified SoundFont and settings.
/// </summary>
/// <param name="soundFont">The SoundFont instance.</param>
/// <param name="settings">The settings for synthesis.</param>
public Synthesizer(SoundFont soundFont, SynthesizerSettings settings)
{
if (soundFont == null)
{
throw new ArgumentNullException(nameof(soundFont));
}
if (settings == null)
{
throw new ArgumentNullException(nameof(settings));
}
this.soundFont = soundFont;
this.sampleRate = settings.SampleRate;
this.blockSize = settings.BlockSize;
this.maximumPolyphony = settings.MaximumPolyphony;
this.enableReverbAndChorus = settings.EnableReverbAndChorus;
minimumVoiceDuration = sampleRate / 500;
presetLookup = new Dictionary <int, Preset>();
var minPresetId = int.MaxValue;
foreach (var preset in soundFont.PresetArray)
{
var presetId = (preset.BankNumber << 16) | preset.PatchNumber;
presetLookup.TryAdd(presetId, preset);
// The preset with the minimum ID number will be default.
// If the SoundFont is GM compatible, the piano will be chosen.
if (presetId < minPresetId)
{
defaultPreset = preset;
minPresetId = presetId;
}
}
channels = new Channel[channelCount];
for (var i = 0; i < channels.Length; i++)
{
channels[i] = new Channel(this, i == percussionChannel);
}
voices = new VoiceCollection(this, maximumPolyphony);
blockLeft = new float[blockSize];
blockRight = new float[blockSize];
inverseBlockSize = 1F / blockSize;
blockRead = blockSize;
masterVolume = 0.5F;
if (enableReverbAndChorus)
{
reverb = new Reverb(sampleRate);
reverbInput = new float[blockSize];
reverbOutputLeft = new float[blockSize];
reverbOutputRight = new float[blockSize];
chorus = new Chorus(sampleRate, 0.002, 0.0019, 0.4);
chorusInputLeft = new float[blockSize];
chorusInputRight = new float[blockSize];
chorusOutputLeft = new float[blockSize];
chorusOutputRight = new float[blockSize];
}
}
