140 lines
2.8 KiB
C#
140 lines
2.8 KiB
C#
using Godot;
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using System.Reflection;
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using System.Collections.Generic;
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using System.Text;
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namespace Rokojori
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{
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[GlobalClass]
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public partial class SineWaveTest: Node
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{
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[Export]
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public float frequency = 100;
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[Export]
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public AudioStreamPlayer player;
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AudioStreamGeneratorPlayback _playback;
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public override void _Ready()
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{
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CreateGraph();
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if ( player.Stream is AudioStreamGenerator generator )
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{
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ag.sampleRate = generator.MixRate;
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player.Play();
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_playback = (AudioStreamGeneratorPlayback) ( player.GetStreamPlayback() );
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Fill();
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}
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}
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WaveTableGenerator generator;
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AudioGraph ag;
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Constant constant;
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public override void _Process( double delta )
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{
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Fill();
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}
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void Fill()
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{
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if ( _playback == null )
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{
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return;
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}
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constant.SetConstant( frequency );
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int framesAvailable = _playback.GetFramesAvailable();
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if ( framesAvailable == 0 )
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{
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return;
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}
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int blocks = 0;
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while ( framesAvailable > frameBuffer.Count )
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{
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ProcessAudio();
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blocks ++;
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}
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var frameBufferData = frameBuffer.ToArray();
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var bufferSlice = new Vector2[ framesAvailable ];
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System.Array.Copy( frameBufferData, 0, bufferSlice, 0, framesAvailable );
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_playback.PushBuffer( bufferSlice );
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var rest = new Vector2[ frameBuffer.Count - framesAvailable ];
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System.Array.Copy( frameBufferData, framesAvailable, rest, 0, rest.Length );
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frameBuffer = new List<Vector2>( rest );
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}
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List<Vector2> frameBuffer = new List<Vector2>();
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void ProcessAudio()
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{
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ag.Process();
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var outputBuffer = generator.output.GetOutputStreamBuffer();
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var data = new Vector2[ ag.bufferSize ];
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for ( int i = 0; i < ag.bufferSize ; i++ )
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{
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data[ i ] = outputBuffer[ i ] * Vector2.One;
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}
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frameBuffer.AddRange( data );
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}
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public void CreateGraph()
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{
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ag = new AudioGraph();
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var sine = new float[ 2048 ];
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var square = new float[ 2048 ];
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for ( int i = 0; i < sine.Length; i++ )
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{
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var p = i / 2048f;
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var v = Mathf.Sin( p * Mathf.Pi * 2.0f );
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sine[ i ] = v;
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square[ i ] = i < sine.Length / 2 ? 1 : -1;
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}
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var sines = new Vector2[ 10 ];
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sines[ 0 ] = Vector2.Zero;
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for ( int i = 1; i < sines.Length; i++ )
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{
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sines[ i ] = new Vector2( Mathf.Pow( 0.5f, i - 1 ), 0 );
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}
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var waveTable = WaveTable.FromSines( sines );
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waveTable.Normalize();
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generator = new WaveTableGenerator( ag, waveTable );
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constant = new Constant( ag, frequency );
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constant.output.ConnectTo( generator.frequency );
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ag.output = generator;
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}
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}
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} |