AudioSettings.dspTime

説明

オーディオシステムの現在時刻を返します。

これは秒単位で指定された値であり、オーディオシステムが処理する実際のサンプル数にもとづくため、Time.time プロパティーから取得される時間よりも正確です。

// The code example shows how to implement a metronome that procedurally generates the click sounds via the OnAudioFilterRead callback.
// While the game is paused or the suspended, this time will not be updated and sounds playing will be paused. Therefore developers of music scheduling routines do not have to do any rescheduling after the app is unpaused 

@script RequireComponent(AudioSource)

public var bpm : double = 140.0;
public var gain : float = 0.5f;
public var signatureHi : int = 4;
public var signatureLo : int = 4;

private var nextTick : double = 0.0;
private var amp : float = 0.0f;
private var phase : float = 0.0f;
private var sampleRate : double = 0.0;
private var accent : int;
private var running : boolean = false;

function Start ()
{
    accent = signatureHi;
    var startTick = AudioSettings.dspTime;
    sampleRate = AudioSettings.outputSampleRate;
    nextTick = startTick * sampleRate;
    running = true;
}

function OnAudioFilterRead(data:float[], channels:int)
{
    if(!running)
        return;
    var samplesPerTick = sampleRate * (60.0f / bpm) * (4.0 / signatureLo);
    var sample = AudioSettings.dspTime * sampleRate;
    var dataLen = data.length / channels;
    for(var n = 0; n < dataLen; n++)
    {
        var x : float = gain * amp * Mathf.Sin(phase);
        for(var i = 0; i < channels; i++)
            data[n * channels + i] += x;
        while (sample + n >= nextTick)
        {
            nextTick += samplesPerTick;
            amp = 1.0;
            if(++accent > signatureHi)
            {
                accent = 1;
                amp *= 2.0;
            }
            Debug.Log("Tick: " + accent + "/" + signatureHi);
        }
        phase += amp * 0.3;
        amp *= 0.993;
    }
}

using UnityEngine;
using System.Collections;

// The code example shows how to implement a metronome that procedurally generates the click sounds via the OnAudioFilterRead callback.
// While the game is paused or the suspended, this time will not be updated and sounds playing will be paused. Therefore developers of music scheduling routines do not have to do any rescheduling after the app is unpaused 

[RequireComponent(typeof(AudioSource))]
public class ExampleClass : MonoBehaviour
{
	public double bpm = 140.0F;
	public float gain = 0.5F;
	public int signatureHi = 4;
	public int signatureLo = 4;
	private double nextTick = 0.0F;
	private float amp = 0.0F;
	private float phase = 0.0F;
	private double sampleRate = 0.0F;
	private int accent;
	private bool running = false;
	void Start()
	{
		accent = signatureHi;
		double startTick = AudioSettings.dspTime;
		sampleRate = AudioSettings.outputSampleRate;
		nextTick = startTick * sampleRate;
		running = true;
	}
	void OnAudioFilterRead(float[] data, int channels)
	{
		if (!running)
			return;

		double samplesPerTick = sampleRate * 60.0F / bpm * 4.0F / signatureLo;
		double sample = AudioSettings.dspTime * sampleRate;
		int dataLen = data.Length / channels;
		int n = 0;
		while (n < dataLen)
		{
			float x = gain * amp * Mathf.Sin(phase);
			int i = 0;
			while (i < channels)
			{
				data[n * channels + i] += x;
				i++;
			}
			while (sample + n >= nextTick)
			{
				nextTick += samplesPerTick;
				amp = 1.0F;
				if (++accent > signatureHi)
				{
					accent = 1;
					amp *= 2.0F;
				}
				Debug.Log("Tick: " + accent + "/" + signatureHi);
			}
			phase += amp * 0.3F;
			amp *= 0.993F;
			n++;
		}
	}
}