bubbles/SoundMachine.cs at master · bar-and-c/bubbles · GitHub

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using NAudio.Wave;
using NAudio.Wave.SampleProviders;
using NAudio.Win8.Wave.WaveOutputs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Bubbles
{
    public class SoundMachine
    {
        const int _numberOfSimultaneousSounds = 10; // Ten finger touch, I believe

        Dictionary<object, Noisesizer> _activeNoisesizers;
        List<Noisesizer> _availableNoisesizers;
        int _noisesizerIndex;
        List<SignalGenerator> _activeSweepers;
        int _sweeperIndex;

        List<ISampleProvider> _sampleProviders;

        WasapiOutRT _waveOut;
        SampleToWaveProvider _sampleToWaveProvider;

        MixingSampleProvider _mixer;

        float _noiseAmplitude = 0.04f;
        float _sweepAmplitude = 0.005f;
        int _sampleRate = 48000;

        public SoundMachine()
        {
            _sampleProviders = new List<ISampleProvider>();

            _activeNoisesizers = new Dictionary<object, Noisesizer>();
            _availableNoisesizers = new List<Noisesizer>();
            _activeSweepers = new List<SignalGenerator>();
            for (int i = 0; i < _numberOfSimultaneousSounds; i++)
            {
                Noisesizer n = CreateNoiseGenerator();
                _sampleProviders.Add(n);
                _availableNoisesizers.Add(n);

                SignalGenerator s = CreateSweeper();
                _activeSweepers.Add(s);
                _sampleProviders.Add(s);
            }
            _sweeperIndex = 0;
            _noisesizerIndex = 0;

            _mixer = new MixingSampleProvider(_sampleProviders);
        }

        private Noisesizer CreateNoiseGenerator()
        {
            Noisesizer n;
            n = new Noisesizer(_sampleRate, _noiseAmplitude);
            n.Off();
            return n;
        }

        private SignalGenerator CreateSweeper()
        {
            SignalGenerator s;
            s = new SignalGenerator(_sampleRate, 1);
            s.Type = SignalGeneratorType.SweepSingleShot;
            s.SweepLengthSecs = 0.03f;
            s.Frequency = 400;
            s.FrequencyEnd = 15000;// 00;
            s.Gain = _sweepAmplitude;
            return s;
        }

        public async void InitAudio()
        {
            _sampleToWaveProvider = new SampleToWaveProvider(_mixer);

            _waveOut = new WasapiOutRT(NAudio.CoreAudioApi.AudioClientShareMode.Shared, 10);

            await _waveOut.Init(_sampleToWaveProvider);
            _waveOut.Play();

        }

        internal void StartNoiseForObject(object p)
        {
            if (!_activeNoisesizers.ContainsKey(p))
            {
                _activeNoisesizers[p] = GetNextNoisesizer();
            }
            _activeNoisesizers[p].On();
        }

        internal void ModulateNoiseForObject(object p, double pressure)
        {
            if (!_activeNoisesizers.ContainsKey(p))
            {
                _activeNoisesizers[p] = GetNextNoisesizer();
                _activeNoisesizers[p].On(); // If not already active it needs to be On()
            }
            _activeNoisesizers[p].Modulate((float)pressure);
        }

        internal void StopNoiseForObject(object p)
        {
            if (_activeNoisesizers.ContainsKey(p))
            {
                _activeNoisesizers[p].Off();
                _activeNoisesizers.Remove(_activeNoisesizers[p]);
            }
        }

        internal void KickSweepForObject(object p)
        {
            _activeSweepers[_sweeperIndex].KickSweep();
            _sweeperIndex = (_sweeperIndex + 1) % _numberOfSimultaneousSounds;
        }

        private Noisesizer GetNextNoisesizer()
        {
            Noisesizer noisesizer;
            noisesizer = _availableNoisesizers[_noisesizerIndex];
            _noisesizerIndex = (_noisesizerIndex + 1) % _numberOfSimultaneousSounds;
            return noisesizer;
        }

    }
}